diff --git a/GridKit/Model/PhasorDynamics/Wind/README.md b/GridKit/Model/PhasorDynamics/Wind/README.md
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+# **Wind Models**
+
+## Introduction
+
+Wind models represent wind-turbine generator and converter components in the
+phasor dynamics model.
+
+## Types
+
+The GridKit wind documentation includes:
+
+- Wind Turbine Generator Aerodynamic Model WTGARA (See [WTGARA](WTGARA/README.md))
+- Wind Turbine Generator Pitch-Control Model WTGPTA (See [WTGPTA](WTGPTA/README.md))
+- Wind Turbine Generator Drive-Train Model WTGTA (See [WTGTA](WTGTA/README.md))
+- Wind Turbine Generator Torque-Control Model WTGTRQA (See [WTGTRQA](WTGTRQA/README.md))
diff --git a/GridKit/Model/PhasorDynamics/Wind/WTGARA/README.md b/GridKit/Model/PhasorDynamics/Wind/WTGARA/README.md
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+# **Wind Turbine Generator Aerodynamic Model (WTGARA)**
+
+WTGARA is a WECC wind-turbine generator aerodynamic model. In GridKit it is
+represented as a signal-control model that computes mechanical power from
+blade-pitch angle feedback.
+
+## Notes
+
+- WTGARA corresponds to the source model `WTGAR_A`.
+- The equivalent PTI source model name is `WTARA1`.
+- When used with WTGTA, connect WTGARA `pm` to WTGTA `pm`.
+- Mechanical-power signal output is on system base.
+- Internal aerodynamic power quantities are on component base.
+
+## Block Diagram
+
+Standard WTGARA aerodynamic model.
+
+![](../../../../../docs/Figures/PhasorDynamics/Wind/WTGARA/diagram.png)
+
+Figure 1: WTGARA block diagram. Figure courtesy of [PowerWorld](https://www.powerworld.com/WebHelp/)
+
+## Model Parameters
+
+Symbol                              | Units        | JSON    | Description                                             | Typical Value | Note
+------------------------------------|--------------|---------|---------------------------------------------------------|---------------|------
+$S^\mathrm{base}$                   | [MVA]        | `mva`   | WTGARA component power base                             | 100.0         | Required positive value; source label: `MVABase`
+$K_a$                               | [p.u./deg^2] | `Ka`    | Aerodynamic gain factor                                 | -             | Block name: `Ka`
+$P_{\text{m},0}$                    | [p.u.]       | `Pm0`   | Prior mechanical power                                  | -             | System base; block name: `Pm0`
+$\theta_0$                          | [deg]        | `Theta` | Prior initial blade pitch angle                         | -             | Block name: `Theta`
+
+### Parameter Validation
+
+Invalid WTGARA parameter sets are rejected by the following checks.
+
+```math
+\begin{aligned}
+  S^\mathrm{base}
+    &> 0
+\end{aligned}
+```
+
+### Model Derived Parameters
+
+```math
+\begin{aligned}
+  k_{\mathrm{base}}
+    &= \dfrac{S^\mathrm{sys}}{S^\mathrm{base}}
+\end{aligned}
+```
+
+## Model Variables
+
+### Internal Variables
+
+#### Differential
+
+None.
+
+#### Algebraic
+
+Symbol                              | Units  | Description                         | Note
+------------------------------------|--------|-------------------------------------|------
+$P_\text{m}$                        | [p.u.] | Mechanical-power output             | System base; signal port `pm`
+
+### External Variables
+
+#### Differential
+
+None.
+
+#### Algebraic
+
+Symbol                              | Units  | Type    | Description                         | Note
+------------------------------------|--------|---------|-------------------------------------|------
+$\theta$                            | [deg]  | Unknown | Blade-pitch angle                   | Signal port `theta`
+
+## Model Equations
+
+### Differential Equations
+
+None.
+
+### Algebraic Equations
+
+```math
+\begin{aligned}
+  0 &=
+    -k_{\mathrm{base}}\left(P_\text{m} - P_{\text{m},0}\right)
+    - K_a\theta\left(\theta - \theta_0\right)
+\end{aligned}
+```
+
+## Initialization
+
+### External Priors
+
+```math
+\begin{aligned}
+  P_\text{m}
+    &\leftarrow \text{mechanical-power start on system base}
+\end{aligned}
+```
+
+### Internal Initialization
+
+None.
+
+### External Solved
+
+```math
+\begin{aligned}
+  \theta
+    &\leftarrow
+      \begin{cases}
+        \dfrac{1}{2}
+        \left[
+          \theta_0
+          + \sqrt{
+            \theta_0^2
+            - \dfrac{4k_{\mathrm{base}}}{K_a}
+              \left(P_\text{m} - P_{\text{m},0}\right)
+          }
+        \right] & K_a\ne 0 \\
+        \theta_0 & K_a = 0
+      \end{cases}
+\end{aligned}
+```
+
+Initialization requires $\theta_0\ge 0$, a nonnegative pitch radicand when
+$K_a\ne 0$, and $P_\text{m} = P_{\text{m},0}$ when
+$K_a=0$.
+
+## Monitorable Outputs
+
+Output          | Units  | Description                         | Note
+----------------|--------|-------------------------------------|------
+`pm`            | [p.u.] | Mechanical-power output             | $P_\text{m}$ (system base)
+`dtheta`        | [deg]  | Pitch-angle deviation               | $\theta-\theta_0$
diff --git a/GridKit/Model/PhasorDynamics/Wind/WTGPTA/README.md b/GridKit/Model/PhasorDynamics/Wind/WTGPTA/README.md
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+# **Wind Turbine Generator Pitch-Control Model (WTGPTA)**
+
+WTGPTA is a WECC wind-turbine generator pitch-control model. In GridKit it is
+represented as a signal-control model that computes a blade-pitch angle from
+rotor-speed and active-power command feedback.
+
+## Notes
+
+- WTGPTA corresponds to the source model `WTGPT_A`.
+- The equivalent `WTPTA1` source model names $K_{\mathrm{ip}}$ and
+  $K_{\mathrm{pp}}$ as `Kiw` and `Kpw`.
+- Signal ports and active-power commands are on system base.
+- Pitch-control states and outputs are in degrees.
+
+## Block Diagram
+
+Standard WTGPTA pitch-control model.
+
+![](../../../../../docs/Figures/PhasorDynamics/Wind/WTGPTA/diagram.png)
+
+Figure 1: WTGPTA block diagram. Figure courtesy of [PowerWorld](https://www.powerworld.com/WebHelp/)
+
+## Model Parameters
+
+Symbol                              | Units         | JSON        | Description                                             | Typical Value | Note
+------------------------------------|---------------|-------------|---------------------------------------------------------|---------------|------
+$S^\mathrm{base}$                   | [MVA]         | `mva`       | WTGPTA component power base                             | 100.0         | Required positive value; source label: `MVABase`
+$T_\theta$                          | [sec]         | `Tp`        | Blade-pitch response time constant                      | -             | State 1 in Fig. 1
+$K_{\mathrm{pp}}$                   | [deg/p.u.]    | `Kpp`       | Speed-control proportional gain                         | -             | `WTPTA1` source label: `Kpw`
+$K_{\mathrm{ip}}$                   | [deg/p.u./s]  | `Kip`       | Speed-control integral gain                             | -             | State 2 path; `WTPTA1` source label: `Kiw`
+$K_{\mathrm{pc}}$                   | [deg/p.u.]    | `Kpc`       | Pitch-compensator proportional gain                     | -             | Block name: `Kpc`
+$K_{\mathrm{ic}}$                   | [deg/p.u./s]  | `Kic`       | Pitch-compensator integral gain                         | -             | State 3 path
+$\theta^{\min}$                     | [deg]         | `ThetaMin`  | Minimum pitch angle                                     | -             | Block name: `ThetaMin`
+$\theta^{\max}$                     | [deg]         | `ThetaMax`  | Maximum pitch angle                                     | -             | Block name: `ThetaMax`
+$R_\theta^{\min}$                   | [deg/s]       | `RThetaMin` | Minimum pitch-rate limit                                | -             | Block name: `RThetaMin`
+$R_\theta^{\max}$                   | [deg/s]       | `RThetaMax` | Maximum pitch-rate limit                                | -             | Block name: `RThetaMax`
+$K_{\mathrm{cc}}$                   | [-]           | `Kcc`       | Cross-coupling gain from active-power error to speed-error path | -      | Block name: `Kcc`
+
+### Parameter Validation
+
+Invalid WTGPTA parameter sets are rejected by the following checks. Let $\epsilon_T=10^{-3}$.
+
+```math
+\begin{aligned}
+  T_\theta
+    &\leftarrow \max\!\left(T_\theta, \epsilon_T\right) \\
+  S^\mathrm{base}
+    &> 0 \\
+  \theta^{\min}
+    &\le \theta^{\max} \\
+  R_\theta^{\min}
+    &\le 0 \le R_\theta^{\max}
+\end{aligned}
+```
+
+### Model Derived Parameters
+
+```math
+\begin{aligned}
+  k_{\mathrm{base}}
+    &= \dfrac{S^\mathrm{sys}}{S^\mathrm{base}}
+\end{aligned}
+```
+
+## Model Variables
+
+### Internal Variables
+
+#### Differential
+
+Symbol                              | Units | Description                         | Note
+------------------------------------|-------|-------------------------------------|------
+$\theta$                            | [deg] | Blade-pitch angle                   | State 1 in Fig. 1
+$x_\omega^\mathrm{I}$               | [deg] | Speed-control integral state        | State 2 in Fig. 1; source label: `PitchControl`
+$x_P^\mathrm{I}$                    | [deg] | Pitch-compensator integral state    | State 3 in Fig. 1; source label: `PitchComp`
+
+#### Algebraic
+
+Symbol                              | Units    | Description                         | Note
+------------------------------------|----------|-------------------------------------|------
+$e_\omega$                          | [p.u.]   | Speed-control error                 |
+$e_P$                               | [p.u.]   | Active-power command error          | Component base
+$\theta_\omega$                     | [deg]    | Limited speed-control pitch command |
+$\theta_P$                          | [deg]    | Limited active-power pitch-compensator command |
+$\theta^\mathrm{cmd}$               | [deg]    | Combined pitch command before blade response |
+$r_\theta$                          | [deg/s]  | Rate-limited pitch derivative target |
+
+### External Variables
+
+#### Differential
+None.
+
+#### Algebraic
+
+Symbol                               | Units  | Type    | Description                       | Note
+-------------------------------------|--------|---------|-----------------------------------|------
+$\omega_t$                           | [p.u.] | Unknown | Turbine rotor speed               | Signal port `omegat`
+$P^\mathrm{ord}$                     | [p.u.] | Unknown | Active-power order feedback       | Signal port `pord`; system base
+$\omega^\mathrm{ref}$                | [p.u.] | Known   | Rotor-speed reference             | Optional signal port `wref`
+$P^\mathrm{ref}$                     | [p.u.] | Known   | Active-power reference            | Optional signal port `pref`; system base
+
+## Model Equations
+
+### Differential Equations
+
+```math
+\begin{aligned}
+  0 &=
+    -\dot{\theta}
+    + \text{antiwindup}
+      \left(\theta, r_\theta;\, \theta^{\min}, \theta^{\max}\right) \\
+  0 &=
+    -\dot{x}_\omega^\mathrm{I}
+    + \text{antiwindup}
+      \left(x_\omega^\mathrm{I}, K_{\mathrm{ip}}e_\omega;\,
+            \theta^{\min}, \theta^{\max}\right) \\
+  0 &=
+    -\dot{x}_P^\mathrm{I}
+    + \text{antiwindup}
+      \left(x_P^\mathrm{I}, K_{\mathrm{ic}}e_P;\,
+            \theta^{\min}, \theta^{\max}\right)
+\end{aligned}
+```
+
+CommonMath defines the [Anti-Windup](../../../../CommonMath.md#anti-windup-indicator)
+target and smooth approximation.
+
+### Algebraic Equations
+
+```math
+\begin{aligned}
+  0 &=
+    -e_P
+    + k_{\mathrm{base}}
+      \left(P^\mathrm{ord} - P^\mathrm{ref}\right) \\
+  0 &=
+    -e_\omega
+    + \omega_t
+    - \omega^\mathrm{ref}
+    + K_{\mathrm{cc}}e_P \\
+  0 &=
+    -\theta_\omega
+    + \text{clamp}
+      \left(K_{\mathrm{pp}}e_\omega + x_\omega^\mathrm{I};\,
+            \theta^{\min}, \theta^{\max}\right) \\
+  0 &=
+    -\theta_P
+    + \text{clamp}
+      \left(K_{\mathrm{pc}}e_P + x_P^\mathrm{I};\,
+            \theta^{\min}, \theta^{\max}\right) \\
+  0 &=
+    -\theta^\mathrm{cmd}
+    + \theta_\omega
+    + \theta_P \\
+  0 &=
+    -r_\theta
+    + \text{clamp}
+      \left(
+        \dfrac{\theta^\mathrm{cmd} - \theta}{T_\theta};\,
+        R_\theta^{\min},\,
+        R_\theta^{\max}
+      \right)
+\end{aligned}
+```
+
+CommonMath defines [clamp](../../../../CommonMath.md#derived-functions).
+
+## Initialization
+
+### External Priors
+
+```math
+\begin{aligned}
+  \theta
+    &\leftarrow \text{blade-pitch angle start} \\
+  \omega^\mathrm{ref}
+    &\leftarrow \text{rotor-speed reference start} \\
+  P^\mathrm{ref}
+    &\leftarrow \text{active-power reference start on system base}
+\end{aligned}
+```
+
+### Internal Initialization
+
+Initialization is performed by evaluating the steady-state residuals in
+dependency order. Let subscript $0$ denote initial values and set all internal
+derivatives to zero:
+
+```math
+\begin{aligned}
+  e_{P,0}
+    &= 0 \\
+  e_{\omega,0}
+    &= 0 \\
+  x_{P,0}^\mathrm{I}
+    &= 0 \\
+  \theta_{P,0}
+    &= 0 \\
+  x_{\omega,0}^\mathrm{I}
+    &= \theta_0 \\
+  \theta_{\omega,0}
+    &= \theta_0 \\
+  \theta_0^\mathrm{cmd}
+    &= \theta_0 \\
+  r_{\theta,0}
+    &= 0
+\end{aligned}
+```
+
+### External Solved
+
+```math
+\begin{aligned}
+  \omega_t
+    &\leftarrow \omega_0^\mathrm{ref} \\
+  P^\mathrm{ord}
+    &\leftarrow P_0^\mathrm{ref}
+\end{aligned}
+```
+
+Initialization rejects pitch starts outside
+$[\theta^{\min},\theta^{\max}]$ and nonzero WTGPTA antiwindup rates.
+
+## Monitorable Outputs
+
+Output          | Units   | Description                         | Note
+----------------|---------|-------------------------------------|------
+`theta`         | [deg]   | Blade-pitch angle                   | $\theta$
+`theta_cmd`     | [deg]   | Combined pitch command before blade response | $\theta^\mathrm{cmd}$
+`theta_speed`   | [deg]   | Limited speed-control pitch command | $\theta_\omega$
+`theta_power`   | [deg]   | Limited active-power pitch-compensator command | $\theta_P$
+`eomega`        | [p.u.]  | Speed-control error                 | $e_\omega$
+`ep`            | [p.u.]  | Active-power command error          | $e_P$ (component base)
diff --git a/GridKit/Model/PhasorDynamics/Wind/WTGTA/README.md b/GridKit/Model/PhasorDynamics/Wind/WTGTA/README.md
new file mode 100644
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+++ b/GridKit/Model/PhasorDynamics/Wind/WTGTA/README.md
@@ -0,0 +1,203 @@
+# **Wind Turbine Generator Drive-Train Model (WTGTA)**
+
+WTGTA is a WECC wind-turbine generator two-mass drive-train model. In GridKit it
+is represented as a signal-control model that computes turbine and generator
+speed states from mechanical and electrical power feedback.
+
+## Notes
+
+- WTGTA corresponds to the source model `WTGT_A`.
+- When used with WTGARA, connect WTGARA `pm` to WTGTA `pm`.
+- When used with WTGPTA, connect WTGTA `omegat` to WTGPTA `omegat`.
+- When used with WTGTRQA, connect WTGTA `omegag` to WTGTRQA `omegag`.
+- Power signal inputs are on system base.
+- Internal torque quantities are on component base.
+- $\omega_g$ is an internal model variable and does not necessarily represent a
+  physical generator speed measurement.
+
+## Block Diagram
+
+Standard WTGTA drive-train model.
+
+![](../../../../../docs/Figures/PhasorDynamics/Wind/WTGTA/diagram.png)
+
+Figure 1: WTGTA block diagram. Figure courtesy of [PowerWorld](https://www.powerworld.com/WebHelp/)
+
+## Model Parameters
+
+Symbol                              | Units        | JSON      | Description                                             | Typical Value | Note
+------------------------------------|--------------|-----------|---------------------------------------------------------|---------------|------
+$H_t$                               | [MW sec/MVA] | `Ht`      | Turbine inertia                                         | -             | State 1 path
+$H_g$                               | [MW sec/MVA] | `Hg`      | Generator inertia                                       | -             | State 3 path
+$D^\mathrm{shaft}$                  | [p.u.]       | `DShaft`  | Shaft damping coefficient                               | -             | Block name: `Dshaft`
+$K^\mathrm{shaft}$                  | [p.u.]       | `KShaft`  | Shaft spring constant                                   | -             | Block name: `Kshaft`
+$S^\mathrm{base}$                   | [MVA]        | `mva`     | WTGTA component power base                              | 100.0         | Required positive value; source label: `MWCap`
+$\omega_0$                          | [p.u.]       | `W0`      | Initial speed                                           | -             | Diagram label: `W0`
+
+### Parameter Validation
+
+Invalid WTGTA parameter sets are rejected by the following checks.
+
+```math
+\begin{aligned}
+  H_t, H_g
+    &> 0 \\
+  D^\mathrm{shaft}
+    &\ge 0 \\
+  K^\mathrm{shaft}
+    &> 0 \\
+  S^\mathrm{base}
+    &> 0 \\
+  \omega_0
+    &> 0
+\end{aligned}
+```
+
+### Model Derived Parameters
+
+```math
+\begin{aligned}
+  k_{\mathrm{base}}
+    &= \dfrac{S^\mathrm{sys}}{S^\mathrm{base}} \\
+  \omega_s
+    &= 2\pi f_{\mathrm{nom}}
+\end{aligned}
+```
+
+Here $f_{\mathrm{nom}}$ is the nominal system frequency.
+
+## Model Variables
+
+### Internal Variables
+
+#### Differential
+
+Symbol                              | Units | Description                         | Note
+------------------------------------|-------|-------------------------------------|------
+$\omega_t$                          | [p.u.] | Turbine speed output                | State 1 in Fig. 1; signal port `omegat`
+$\delta^\mathrm{shaft}$             | [rad] | Shaft angle                         | State 2 in Fig. 1
+$\omega_g$                          | [p.u.] | Generator speed output              | State 3 in Fig. 1; signal port `omegag`
+$\delta_g$                          | [rad] | Generator delta angle               | State 4 in Fig. 1
+
+#### Algebraic
+
+Symbol                              | Units  | Description                         | Note
+------------------------------------|--------|-------------------------------------|------
+$T_m$                               | [p.u.] | Mechanical torque                   | Component base
+$T_e$                               | [p.u.] | Electrical torque                   | Component base
+$T_{\mathrm{d}}$                    | [p.u.] | Shaft damping torque                | Component base
+$T_{\mathrm{s}}$                    | [p.u.] | Shaft spring torque                 | Component base
+
+### External Variables
+
+#### Differential
+
+None.
+
+#### Algebraic
+
+Symbol                              | Units  | Type  | Description                         | Note
+------------------------------------|--------|-------|-------------------------------------|------
+$P_\text{m}$                        | [p.u.] | Known   | Mechanical power                   | Signal port `pm`; system base
+$P_e$                               | [p.u.] | Known   | Electrical active-power feedback   | Signal port `pelec`; system base
+
+## Model Equations
+
+### Differential Equations
+
+```math
+\begin{aligned}
+  0 &=
+    -\dot{\omega}_t
+    + \dfrac{1}{2H_t}
+      \left(T_m - T_{\mathrm{s}} - T_{\mathrm{d}}\right) \\
+  0 &=
+    -\dot{\delta}^\mathrm{shaft}
+    + \omega_s\left(\omega_t - \omega_g\right) \\
+  0 &=
+    -\dot{\omega}_g
+    + \dfrac{1}{2H_g}
+      \left(T_{\mathrm{s}} + T_{\mathrm{d}} - T_e\right) \\
+  0 &=
+    -\dot{\delta}_g
+    + \omega_s\left(\omega_g - \omega_0\right)
+\end{aligned}
+```
+
+### Algebraic Equations
+
+```math
+\begin{aligned}
+  0 &=
+    -\omega_t T_m
+    + k_{\mathrm{base}}P_\text{m} \\
+  0 &=
+    -\omega_g T_e
+    + k_{\mathrm{base}}P_e \\
+  0 &=
+    -T_{\mathrm{d}}
+    + D^\mathrm{shaft}\left(\omega_t - \omega_g\right) \\
+  0 &=
+    -\omega_s T_{\mathrm{s}}
+    + K^\mathrm{shaft}\delta^\mathrm{shaft}
+\end{aligned}
+```
+
+## Initialization
+
+### External Priors
+
+```math
+\begin{aligned}
+  \omega_t, \omega_g
+    &\leftarrow \text{initial speeds}
+\end{aligned}
+```
+
+### Internal Initialization
+
+Initialization is performed by evaluating the steady-state residuals in
+dependency order. Let subscript $0$ denote initial values and set all internal
+derivatives to zero:
+
+```math
+\begin{aligned}
+  T_{\mathrm{d},0}
+    &= D^\mathrm{shaft}\left(\omega_{t,0} - \omega_{g,0}\right) \\
+  T_{\mathrm{s},0}
+    &= 0 \\
+  T_{m,0}
+    &= T_{\mathrm{s},0} + T_{\mathrm{d},0} \\
+  T_{e,0}
+    &= T_{\mathrm{s},0} + T_{\mathrm{d},0} \\
+  \delta_0^\mathrm{shaft}
+    &= 0 \\
+  \delta_{g,0}
+    &= 0
+\end{aligned}
+```
+
+### External Solved
+
+```math
+\begin{aligned}
+  P_\text{m}
+    &\leftarrow \dfrac{\omega_{t,0}T_{m,0}}{k_{\mathrm{base}}} \\
+  P_e
+    &\leftarrow \dfrac{\omega_{g,0}T_{e,0}}{k_{\mathrm{base}}}
+\end{aligned}
+```
+
+Initialization rejects starts with $\omega_{t,0}\ne \omega_{g,0}$ or
+$\omega_{g,0}\ne \omega_0$.
+
+## Monitorable Outputs
+
+Output            | Units  | Description                         | Note
+------------------|--------|-------------------------------------|------
+`omegat`          | [p.u.] | Turbine speed                       | $\omega_t$
+`omegag`          | [p.u.] | Generator speed                     | $\omega_g$
+`shaft_angle`     | [rad]  | Shaft angle                         | $\delta^\mathrm{shaft}$
+`gen_delta_angle` | [rad]  | Generator delta angle               | $\delta_g$
+`tm`              | [p.u.] | Mechanical torque                   | $T_m$ (component base)
+`te`              | [p.u.] | Electrical torque                   | $T_e$ (component base)
diff --git a/GridKit/Model/PhasorDynamics/Wind/WTGTRQA/README.md b/GridKit/Model/PhasorDynamics/Wind/WTGTRQA/README.md
new file mode 100644
index 000000000..3d7210165
--- /dev/null
+++ b/GridKit/Model/PhasorDynamics/Wind/WTGTRQA/README.md
@@ -0,0 +1,275 @@
+# **Wind Turbine Generator Torque-Control Model (WTGTRQA)**
+
+WTGTRQA is a WECC wind-turbine generator torque-control model. In GridKit it is
+represented as a signal-control model that computes speed and active-power
+references for downstream wind-turbine controls.
+
+## Notes
+
+- WTGTRQA corresponds to the source model `WTGTRQ_A`.
+- The equivalent PTI source model name is `WTTQA1`.
+- When used with REECA, connect WTGTRQA `pref` to REECA `pref`.
+- When used with WTGPTA, connect WTGTRQA `wref` to WTGPTA `wref`.
+- Active-power signal ports are on system base.
+- Internal measured power and torque-controller quantities are on component base.
+
+## Block Diagram
+
+Standard WTGTRQA wind-turbine generator torque-control model.
+
+![](../../../../../docs/Figures/PhasorDynamics/Wind/WTGTRQA/diagram.png)
+
+Figure 1: WTGTRQA block diagram. Figure courtesy of [PowerWorld](https://www.powerworld.com/WebHelp/)
+
+## Model Parameters
+
+Symbol                              | Units    | JSON      | Description                                             | Typical Value | Note
+------------------------------------|----------|-----------|---------------------------------------------------------|---------------|------
+$S^\mathrm{base}$                   | [MVA]    | `mva`     | WTGTRQA component power base                            | 100.0         | Required positive value; source label: `MVABase`
+$s_T$                               | [index]  | `Flag`    | Torque-controller mode flag                             | -             | 0 = torque control, 1 = speed control, 2 = torque control with $P^\mathrm{ref}_0$ upper torque limit
+$K_{\mathrm{ip}}$                   | [p.u./s] | `Kip`     | Integral gain                                           | -             | State 3 path
+$K_{\mathrm{pp}}$                   | [p.u.]   | `Kpp`     | Proportional gain                                       | -             | Block name: `Kpp`
+$T_p$                               | [sec]    | `Tp`      | Electrical-power measurement lag time constant          | -             | State 2 in Fig. 1
+$T_{\omega}^{\mathrm{ref}}$         | [sec]    | `Twref`   | Speed-reference lag time constant                       | -             | State 1 in Fig. 1
+$T_e^{\max}$                        | [p.u.]   | `Temax`   | Maximum torque limit                                    | -             | Block name: `Temax`
+$T_e^{\min}$                        | [p.u.]   | `Temin`   | Minimum torque limit                                    | -             | Block name: `Temin`
+$P_1$                               | [p.u.]   | `P1`      | Power point 1 for speed-reference curve                 | -             | Component base
+$\omega_1$                          | [p.u.]   | `Speed1`  | Speed point 1 for speed-reference curve                 | -             |
+$P_2$                               | [p.u.]   | `P2`      | Power point 2 for speed-reference curve                 | -             | Component base
+$\omega_2$                          | [p.u.]   | `Speed2`  | Speed point 2 for speed-reference curve                 | -             |
+$P_3$                               | [p.u.]   | `P3`      | Power point 3 for speed-reference curve                 | -             | Component base
+$\omega_3$                          | [p.u.]   | `Speed3`  | Speed point 3 for speed-reference curve                 | -             |
+$P_4$                               | [p.u.]   | `P4`      | Power point 4 for speed-reference curve                 | -             | Component base
+$\omega_4$                          | [p.u.]   | `Speed4`  | Speed point 4 for speed-reference curve                 | -             |
+
+### Parameter Validation
+
+Invalid WTGTRQA parameter sets are rejected by the following checks. Let $\epsilon_T=10^{-3}$.
+
+```math
+\begin{aligned}
+  T &\leftarrow \max\!\left(T, \epsilon_T\right)
+    \quad T\in\{T_p,T_{\omega}^{\mathrm{ref}}\} \\
+  S^\mathrm{base}
+    &> 0 \\
+  s_T
+    &\in \{0,1,2\} \\
+  T_e^{\min}
+    &\le 0 \le T_e^{\max} \\
+  0
+    &\le P_1 < P_2 < P_3 < P_4 \\
+  \omega_1,\omega_2,\omega_3,\omega_4
+    &> 0
+\end{aligned}
+```
+
+### Model Derived Parameters
+
+```math
+\begin{aligned}
+  k_{\mathrm{base}}
+    &= \dfrac{S^\mathrm{sys}}{S^\mathrm{base}} \\
+  \omega^\mathrm{sch}(P)
+    &= \omega_1
+       + \text{linseg}\left(P;\, P_1, P_2, \omega_2-\omega_1\right)
+       + \text{linseg}\left(P;\, P_2, P_3, \omega_3-\omega_2\right)
+       + \text{linseg}\left(P;\, P_3, P_4, \omega_4-\omega_3\right)
+\end{aligned}
+```
+
+CommonMath defines [linseg](../../../../CommonMath.md#derived-functions).
+
+## Model Variables
+
+### Internal Variables
+
+#### Differential
+
+Symbol                              | Units  | Description                         | Note
+------------------------------------|--------|-------------------------------------|------
+$\omega^\mathrm{ref}$               | [p.u.] | Filtered speed reference            | State 1 in Fig. 1; signal port `wref`
+$P^\mathrm{meas}$                   | [p.u.] | Filtered electrical active power    | State 2 in Fig. 1; component base
+$x_T^\mathrm{I}$                    | [p.u.] | Torque-control integral state       | State 3 in Fig. 1; component base
+
+#### Algebraic
+
+Symbol                              | Units  | Description                         | Note
+------------------------------------|--------|-------------------------------------|------
+$\omega^\mathrm{cmd}$               | [p.u.] | Scheduled speed reference           | From $\omega^\mathrm{sch}(P^\mathrm{meas})$
+$e_P$                               | [p.u.] | Active-power reference error        | Component base
+$e_\omega$                          | [p.u.] | Speed-control error                 |
+$e_T$                               | [p.u.] | Selected torque-controller error    |
+$T_e^{\max,\mathrm{eff}}$           | [p.u.] | Effective maximum torque limit      |
+$T_e^\mathrm{raw}$                  | [p.u.] | Unlimited torque command            |
+$T_e^\mathrm{cmd}$                  | [p.u.] | Limited torque command              |
+$P^\mathrm{ref}$                    | [p.u.] | Active-power reference output       | System base; signal port `pref`
+
+### External Variables
+
+#### Differential
+
+None.
+
+#### Algebraic
+
+Symbol                              | Units    | Type    | Description                         | Note
+------------------------------------|----------|---------|-------------------------------------|------
+$P_e$                               | [p.u.]   | Known   | Electrical active-power feedback    | Signal port `pelec`; system base
+$\omega_g$                          | [p.u.]   | Known   | Generator speed from drive-train model | Signal port `omegag`
+$s_{\mathrm{frz}}$                  | [binary] | Known   | Voltage-dip freeze signal           | 1 freezes $x_T^\mathrm{I}$
+$P^\mathrm{ref}_0$                  | [p.u.]   | Known   | Active-power reference input        | Optional signal port `pref0`; system base
+
+## Model Equations
+
+### Differential Equations
+
+```math
+\begin{aligned}
+  0 &=
+    -\dot{\omega}^\mathrm{ref}
+    + \dfrac{1}{T_{\omega}^{\mathrm{ref}}}
+      \left(\omega^\mathrm{cmd} - \omega^\mathrm{ref}\right) \\
+  0 &=
+    -\dot{P}^\mathrm{meas}
+    + \dfrac{1}{T_p}
+      \left(k_{\mathrm{base}}P_e - P^\mathrm{meas}\right) \\
+  0 &=
+    -\dot{x}_T^\mathrm{I}
+    + \left(1-s_{\mathrm{frz}}\right)
+      \text{antiwindup}
+      \left(
+        T_e^\mathrm{raw}, K_{\mathrm{ip}}e_T;\,
+        T_e^{\min}, T_e^{\max,\mathrm{eff}}
+      \right)
+\end{aligned}
+```
+
+CommonMath defines the [Anti-Windup](../../../../CommonMath.md#anti-windup-indicator)
+target and smooth approximation.
+
+### Algebraic Equations
+
+```math
+\begin{aligned}
+  0 &=
+    -\omega^\mathrm{cmd}
+    + \omega^\mathrm{sch}\left(P^\mathrm{meas}\right) \\
+  0 &=
+    -e_P
+    + k_{\mathrm{base}}P^\mathrm{ref}_0
+    - P^\mathrm{meas} \\
+  0 &=
+    -e_\omega
+    + \omega_g
+    - \omega^\mathrm{ref} \\
+  0 &=
+    -e_T
+    + \begin{cases}
+      \dfrac{e_P}{\omega_g}
+        & s_T\in\{0,2\} \\
+      e_\omega
+        & s_T = 1
+    \end{cases} \\
+  0 &=
+    -T_e^{\max,\mathrm{eff}}
+    + \begin{cases}
+      T_e^{\max}
+        & s_T\in\{0,1\} \\
+      \dfrac{k_{\mathrm{base}}P^\mathrm{ref}_0}{\omega_g}
+        & s_T = 2
+    \end{cases} \\
+  0 &=
+    -T_e^\mathrm{raw}
+    + K_{\mathrm{pp}}e_T
+    + x_T^\mathrm{I} \\
+  0 &=
+    -T_e^\mathrm{cmd}
+    + \text{clamp}
+      \left(T_e^\mathrm{raw};\, T_e^{\min}, T_e^{\max,\mathrm{eff}}\right) \\
+  0 &=
+    -k_{\mathrm{base}}P^\mathrm{ref}
+    + \omega_g T_e^\mathrm{cmd}
+\end{aligned}
+```
+
+CommonMath defines [clamp](../../../../CommonMath.md#derived-functions).
+
+## Initialization
+
+### External Priors
+
+```math
+\begin{aligned}
+  P^\mathrm{ref}
+    &\leftarrow \text{active-power reference start} \\
+  s_{\mathrm{frz}}
+    &\leftarrow \text{voltage-dip freeze signal}
+\end{aligned}
+```
+
+### Internal Initialization
+
+Initialization is performed by evaluating the steady-state residuals in
+dependency order. Let subscript $0$ denote initial values and set all internal
+derivatives to zero:
+
+```math
+\begin{aligned}
+  P_0^\mathrm{meas}
+    &= k_{\mathrm{base}}P^\mathrm{ref}_0 \\
+  \omega_0^\mathrm{cmd}
+    &= \omega^\mathrm{sch}\left(P_0^\mathrm{meas}\right) \\
+  \omega_0^\mathrm{ref}
+    &= \omega_0^\mathrm{cmd} \\
+  e_{\omega,0}
+    &= 0 \\
+  e_{P,0}
+    &= 0 \\
+  e_{T,0}
+    &=
+    \begin{cases}
+      \dfrac{e_{P,0}}{\omega_0^\mathrm{ref}}
+        & s_T\in\{0,2\} \\
+      e_{\omega,0}
+        & s_T = 1
+    \end{cases} \\
+  T_{e,0}^{\max,\mathrm{eff}}
+    &=
+    \begin{cases}
+      T_e^{\max}
+        & s_T\in\{0,1\} \\
+      \dfrac{k_{\mathrm{base}}P^\mathrm{ref}_0}{\omega_0^\mathrm{ref}}
+        & s_T = 2
+    \end{cases} \\
+  T_{e,0}^\mathrm{cmd}
+    &= \dfrac{k_{\mathrm{base}}P^\mathrm{ref}_0}{\omega_0^\mathrm{ref}} \\
+  x_{T,0}^\mathrm{I}
+    &= T_{e,0}^\mathrm{cmd} - K_{\mathrm{pp}}e_{T,0} \\
+  T_{e,0}^\mathrm{raw}
+    &= K_{\mathrm{pp}}e_{T,0} + x_{T,0}^\mathrm{I}
+\end{aligned}
+```
+
+### External Solved
+
+```math
+\begin{aligned}
+  \omega_g
+    &\leftarrow \omega_0^\mathrm{ref} \\
+  P_e
+    &\leftarrow P^\mathrm{ref}_0
+\end{aligned}
+```
+
+Initialization rejects nonpositive solved generator-speed starts, initialized
+torque commands outside their limits, and nonzero WTGTRQA antiwindup rates.
+
+## Monitorable Outputs
+
+Output          | Units  | Description                         | Note
+----------------|--------|-------------------------------------|------
+`pref`          | [p.u.] | Active-power reference output       | $P^\mathrm{ref}$ (system base)
+`pmeas`         | [p.u.] | Filtered electrical active power    | $P^\mathrm{meas}$ (component base)
+`wref`          | [p.u.] | Filtered speed reference            | $\omega^\mathrm{ref}$
+`tecmd`         | [p.u.] | Limited torque command              | $T_e^\mathrm{cmd}$ (component base)
+`et`            | [p.u.] | Selected torque-controller error    | $e_T$
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diff --git a/docs/GridKit/Model/PhasorDynamics/README.md b/docs/GridKit/Model/PhasorDynamics/README.md
index e5209139a..439e0749e 100644
--- a/docs/GridKit/Model/PhasorDynamics/README.md
+++ b/docs/GridKit/Model/PhasorDynamics/README.md
@@ -17,6 +17,7 @@ Load <Load/README>
 SignalNode <SignalNode/README>
 Stabilizer <Stabilizer/README>
 SynchronousMachine <SynchronousMachine/README>
+Wind <Wind/README>
 ```
 
 ```{include} ../../../../GridKit/Model/PhasorDynamics/README.md
diff --git a/docs/GridKit/Model/PhasorDynamics/Wind/README.md b/docs/GridKit/Model/PhasorDynamics/Wind/README.md
new file mode 100644
index 000000000..db5383683
--- /dev/null
+++ b/docs/GridKit/Model/PhasorDynamics/Wind/README.md
@@ -0,0 +1,17 @@
+# Wind
+
+```{toctree}
+:maxdepth: 4
+:titlesonly:
+:hidden:
+
+WTGARA <WTGARA/README>
+WTGPTA <WTGPTA/README>
+WTGTA <WTGTA/README>
+WTGTRQA <WTGTRQA/README>
+```
+
+```{include} ../../../../../GridKit/Model/PhasorDynamics/Wind/README.md
+:start-line: 1
+:relative-images:
+```
diff --git a/docs/GridKit/Model/PhasorDynamics/Wind/WTGARA/README.md b/docs/GridKit/Model/PhasorDynamics/Wind/WTGARA/README.md
new file mode 100644
index 000000000..e0bca6c5b
--- /dev/null
+++ b/docs/GridKit/Model/PhasorDynamics/Wind/WTGARA/README.md
@@ -0,0 +1,6 @@
+# WTGARA
+
+```{include} ../../../../../../GridKit/Model/PhasorDynamics/Wind/WTGARA/README.md
+:start-line: 1
+:relative-images:
+```
diff --git a/docs/GridKit/Model/PhasorDynamics/Wind/WTGPTA/README.md b/docs/GridKit/Model/PhasorDynamics/Wind/WTGPTA/README.md
new file mode 100644
index 000000000..1b3320f87
--- /dev/null
+++ b/docs/GridKit/Model/PhasorDynamics/Wind/WTGPTA/README.md
@@ -0,0 +1,6 @@
+# WTGPTA
+
+```{include} ../../../../../../GridKit/Model/PhasorDynamics/Wind/WTGPTA/README.md
+:start-line: 1
+:relative-images:
+```
diff --git a/docs/GridKit/Model/PhasorDynamics/Wind/WTGTA/README.md b/docs/GridKit/Model/PhasorDynamics/Wind/WTGTA/README.md
new file mode 100644
index 000000000..31d28f7b7
--- /dev/null
+++ b/docs/GridKit/Model/PhasorDynamics/Wind/WTGTA/README.md
@@ -0,0 +1,6 @@
+# WTGTA
+
+```{include} ../../../../../../GridKit/Model/PhasorDynamics/Wind/WTGTA/README.md
+:start-line: 1
+:relative-images:
+```
diff --git a/docs/GridKit/Model/PhasorDynamics/Wind/WTGTRQA/README.md b/docs/GridKit/Model/PhasorDynamics/Wind/WTGTRQA/README.md
new file mode 100644
index 000000000..a39c323c4
--- /dev/null
+++ b/docs/GridKit/Model/PhasorDynamics/Wind/WTGTRQA/README.md
@@ -0,0 +1,6 @@
+# WTGTRQA
+
+```{include} ../../../../../../GridKit/Model/PhasorDynamics/Wind/WTGTRQA/README.md
+:start-line: 1
+:relative-images:
+```