Shao Rui
123487
Dependencies: mbed-dev-f303 FastPWM3
Diff: FOC/foc.cpp
- Revision:
- 47:e1196a851f76
- Parent:
- 46:2d4b1dafcfe3
- Child:
- 48:74a40481740c
--- a/FOC/foc.cpp Thu Jul 12 02:50:34 2018 +0000
+++ b/FOC/foc.cpp Wed Dec 05 04:07:46 2018 +0000
@@ -34,12 +34,22 @@
/// u,v,w amplitude = v_bus for full modulation depth ///
float v_offset = (fminf3(u, v, w) + fmaxf3(u, v, w))/2.0f;
+
*dtc_u = fminf(fmaxf(((u -v_offset)/v_bus + .5f), DTC_MIN), DTC_MAX);
*dtc_v = fminf(fmaxf(((v -v_offset)/v_bus + .5f), DTC_MIN), DTC_MAX);
- *dtc_w = fminf(fmaxf(((w -v_offset)/v_bus + .5f), DTC_MIN), DTC_MAX);
+ *dtc_w = fminf(fmaxf(((w -v_offset)/v_bus + .5f), DTC_MIN), DTC_MAX);
+
+ /*
+ sinusoidal pwm
+ *dtc_u = fminf(fmaxf((u/v_bus + .5f), DTC_MIN), DTC_MAX);
+ *dtc_v = fminf(fmaxf((v/v_bus + .5f), DTC_MIN), DTC_MAX);
+ *dtc_w = fminf(fmaxf((w/v_bus + .5f), DTC_MIN), DTC_MAX);
+ */
+
}
+
void zero_current(int *offset_1, int *offset_2){ // Measure zero-offset of the current sensors
int adc1_offset = 0;
int adc2_offset = 0;
@@ -79,6 +89,7 @@
controller->d_int = 0;
controller->v_q = 0;
controller->v_d = 0;
+
}
void limit_current_ref (ControllerStruct *controller){
@@ -88,11 +99,8 @@
}
-void commutate(ControllerStruct *controller, ObserverStruct *observer, GPIOStruct *gpio, float theta){
- /// Observer Prediction ///
- observer->i_d_est += DT*(observer->i_d_dot);
- observer->i_q_est += DT*(observer->i_q_dot);
-
+void commutate(ControllerStruct *controller, GPIOStruct *gpio, float theta){
+
/// Commutation Loop ///
controller->loop_count ++;
if(PHASE_ORDER){ // Check current sensor ordering
@@ -112,21 +120,8 @@
//controller->i_q = 0.6666667f*(-s*controller->i_a - (-0.86602540378f*c-.5f*s)*controller->i_b - (0.86602540378f*c-.5f*s)*controller->i_c);
controller->i_q_filt = 0.95f*controller->i_q_filt + 0.05f*controller->i_q;
- observer->i_d_m = controller->i_d;
- observer->i_q_m = controller->i_q;
-
- observer->e_d = observer->i_d_m - observer->i_d_est;
- observer->e_q = observer->i_q_m - observer->i_q_est;
- observer->e_d_int += observer->e_d;
- observer->e_q_int += observer->e_q;
+ controller->i_d_filt = 0.95f*controller->i_d_filt + 0.05f*controller->i_d;
- observer->i_d_est += K_O*observer->e_d + .001f*observer->e_d_int;
- observer->i_q_est += K_O*observer->e_q + .001f*observer->e_q_int;
-
-
- //float scog12 = FastSin(12.0f*theta);
- //float scog1 = s;
- //float cogging_current = 0.25f*scog1 - 0.3f*scog12;
// Filter the current references to the desired closed-loopbandwidth
// Allows calculation of desired di/dt for inductance, etc
@@ -137,32 +132,42 @@
controller->did_dt = (controller->i_d_ref_filt - controller->did_dt)/DT;
controller->diq_dt = (controller->i_q_ref_filt - controller->diq_dt)/DT;
+
+ /// Field Weakening ///
+ /*
+ controller->fw_int += .001*(0.5f*OVERMODULATION*controller->v_bus - controller->v_ref);
+ controller->fw_int = fmaxf(fminf(controller->fw_int, 0.0f), -I_MAX_FW);
+ controller->i_d_ref = controller->fw_int;
+ float i_cmd_mag_sq = controller->i_d_ref*controller->i_d_ref + controller->i_q_ref*controller->i_q_ref;
+ limit_norm(&controller->i_d_ref, &controller->i_q_ref, I_MAX);
+
+ */
+
/// PI Controller ///
float i_d_error = controller->i_d_ref - controller->i_d;
float i_q_error = controller->i_q_ref - controller->i_q;// + cogging_current;
// Calculate feed-forward voltages //
- float v_d_ff = 2.0f*(0.0f*controller->i_d_ref*R_PHASE + 0.0f*L_D*controller->did_dt - controller->dtheta_elec*L_Q*controller->i_q); //feed-forward voltages
- float v_q_ff = 2.0f*(0.0f*controller->i_q_ref*R_PHASE + 0.0f*L_Q*controller->diq_dt + controller->dtheta_elec*(L_D*controller->i_d + 0.0f*WB));
+ float v_d_ff = 2.0f*(1.0f*controller->i_d_ref*R_PHASE - controller->dtheta_elec*L_Q*controller->i_q); //feed-forward voltages
+ float v_q_ff = 2.0f*(1.0f*controller->i_q_ref*R_PHASE + controller->dtheta_elec*(L_D*controller->i_d + 1.0f*WB));
// Integrate Error //
- controller->d_int += i_d_error;
- controller->q_int += i_q_error;
-
- limit_norm(&controller->d_int, &controller->q_int, V_BUS/(controller->k_q*controller->ki_q));
- controller->v_d = controller->k_d*(i_d_error + controller->ki_d*controller->d_int) + v_d_ff;
- controller->v_q = controller->k_q*(i_q_error + controller->ki_q*controller->q_int) + v_q_ff;
+ controller->d_int += controller->k_d*controller->ki_d*i_d_error;
+ controller->q_int += controller->k_q*controller->ki_q*i_q_error;
+
+ controller->d_int = fmaxf(fminf(controller->d_int, OVERMODULATION*controller->v_bus), - OVERMODULATION*controller->v_bus);
+ controller->q_int = fmaxf(fminf(controller->q_int, OVERMODULATION*controller->v_bus), - OVERMODULATION*controller->v_bus);
+
+ //limit_norm(&controller->d_int, &controller->q_int, OVERMODULATION*controller->v_bus);
+ controller->v_d = controller->k_d*i_d_error + controller->d_int ;//+ v_d_ff;
+ controller->v_q = controller->k_q*i_q_error + controller->q_int ;//+ v_q_ff;
+
+ controller->v_ref = sqrt(controller->v_d*controller->v_d + controller->v_q*controller->v_q);
limit_norm(&controller->v_d, &controller->v_q, OVERMODULATION*controller->v_bus); // Normalize voltage vector to lie within curcle of radius v_bus
- abc(controller->theta_elec + 0.5f*DT*controller->dtheta_elec, controller->v_d, controller->v_q, &controller->v_u, &controller->v_v, &controller->v_w); //inverse dq0 transform on voltages
+ abc(controller->theta_elec + 0.0f*DT*controller->dtheta_elec, controller->v_d, controller->v_q, &controller->v_u, &controller->v_v, &controller->v_w); //inverse dq0 transform on voltages
svm(controller->v_bus, controller->v_u, controller->v_v, controller->v_w, &controller->dtc_u, &controller->dtc_v, &controller->dtc_w); //space vector modulation
- observer->i_d_dot = 0.5f*(controller->v_d - 2.0f*(observer->i_d_est*R_PHASE - controller->dtheta_elec*L_Q*observer->i_q_est))/L_D; //feed-forward voltage
- observer->i_q_dot = 0.5f*(controller->v_q - 2.0f*(observer->i_q_est*R_PHASE + controller->dtheta_elec*(L_D*observer->i_d_est + WB)))/L_Q;
-
- //controller->dtc_u = 0.5f;
- //controller->dtc_v = 0.6f;
- //controller->dtc_w = 0.5f;
if(PHASE_ORDER){ // Check which phase order to use,
TIM1->CCR3 = (PWM_ARR)*(1.0f-controller->dtc_u); // Write duty cycles
TIM1->CCR2 = (PWM_ARR)*(1.0f-controller->dtc_v);
@@ -176,17 +181,6 @@
controller->theta_elec = theta; //For some reason putting this at the front breaks thins
-
- if(controller->loop_count >400){
- //controller->i_q_ref = -controller->i_q_ref;
- controller->loop_count = 0;
-
- //printf("%.2f %.2f %.2f\n\r", controller->i_a, controller->i_b, controller->i_c);
- //printf("%f\n\r", controller->dtheta_mech*GR);
- //pc.printf("%f %f %f\n\r", controller->i_a, controller->i_b, controller->i_c);
- printf("%f %f\n\r", v_q_ff, v_d_ff);
- //pc.printf("%d %d\n\r", controller->adc1_raw, controller->adc2_raw);
- }
}
@@ -196,10 +190,4 @@
controller->i_q_ref = torque_ref/KT_OUT;
controller->i_d_ref = 0.0f;
}
-
-
-/*
-void zero_encoder(ControllerStruct *controller, GPIOStruct *gpio, ){
-
- }
-*/
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+
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