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基于TMS320F28335的三相PFC数字控制代码实现

news 2026/3/26 19:08:31

一、硬件初始化配置

1. 系统时钟与GPIO配置

#include "DSP28x_Project.h"void SystemInit(void) {// 关闭看门狗DINT;InitSysCtrl();// 配置系统时钟为150MHzInitPllSys(150, 10, 1, 0);// 配置GPIO为外设功能EALLOW;GpioCtrlRegs.GPADIR.bit.GPIO0 = 0;  // ePWM1A设为输入GpioCtrlRegs.GPADIR.bit.GPIO1 = 0;  // ePWM1B设为输入GpioCtrlRegs.GPADIR.bit.GPIO2 = 0;  // ePWM2A设为输入GpioCtrlRegs.GPADIR.bit.GPIO3 = 0;  // ePWM2B设为输入EDIS;
}

2. ePWM模块初始化（以ePWM1为例）

void EPwm1_Init(uint16_t period, float duty) {// 1. 时钟分频配置EPwm1Regs.TBPRD = period - 1;         // 周期寄存器（10kHz对应1000）EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // 双向计数EPwm1Regs.TBCTL.bit.HSPCLKDIV = 0;    // 主时钟分频EPwm1Regs.TBCTL.bit.CLKDIV = 0;       // 系统时钟分频// 2. 比较值配置EPwm1Regs.CMPA.half.CMPA = (uint16_t)(duty * period); // 占空比EPwm1Regs.CMPB = period - EPwm1Regs.CMPA;              // 互补通道// 3. 动作限定配置EPwm1Regs.AQCTLA.bit.CAU = AQ_SET;    // A通道递增时置高EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR;  // A通道递减时清零EPwm1Regs.AQCTLB.bit.CBU = AQ_SET;    // B通道递增时置高EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR;  // B通道递减时清零// 4. 死区控制（1.5μs）EPwm1Regs.DBCTL.bit.DBFED = 150;      // 上升沿延迟EPwm1Regs.DBCTL.bit.DBRIS = 1;        // 启用死区// 5. 启动计数器EPwm1Regs.TBCTL.bit.ENABLE = 1;       // 使能计数器
}

二、ADC同步采样配置

1. ADC模块初始化

void Adc_Init(void) {// 关闭ADC电源EALLOW;AdcRegs.ADCCTL1.bit.ADCPWDNZ = 0;DELAY_US(1000);  // 等待电源稳定AdcRegs.ADCCTL1.bit.ADCPWDNZ = 1;  // 上电// 配置ADC时钟为12MHz（SYSCLK/2）AdcRegs.ADCCTL1.bit.ADCREFSEL = 0;   // 内部1.2V参考AdcRegs.ADCCTL1.bit.ADCCLKPS = 0x3;  // 分频系数// 配置通道同步采样（ePWM1触发）AdcRegs.ADCSOC0CTL.bit.CHSEL = 0;    // 通道0（电压采样）AdcRegs.ADCSOC0CTL.bit.TRIGSEL = 5;  // ePWM1触发AdcRegs.ADCSOC0CTL.bit.ACQPS = 14;   // 采样保持时间AdcRegs.ADCSOC1CTL.bit.CHSEL = 1;    // 通道1（电流A相）AdcRegs.ADCSOC1CTL.bit.TRIGSEL = 5;AdcRegs.ADCSOC1CTL.bit.ACQPS = 14;AdcRegs.ADCSOC2CTL.bit.CHSEL = 2;    // 通道2（电流B相）AdcRegs.ADCSOC2CTL.bit.TRIGSEL = 5;AdcRegs.ADCSOC2CTL.bit.ACQPS = 14;AdcRegs.ADCSOC3CTL.bit.CHSEL = 3;    // 通道3（电流C相）AdcRegs.ADCSOC3CTL.bit.TRIGSEL = 5;AdcRegs.ADCSOC3CTL.bit.ACQPS = 14;// 启动ADCAdcRegs.ADCCTL1.bit.ADCEN = 1;
}

三、双闭环控制算法

1. 电压外环PI控制

typedef struct {float Kp;float Ki;float integral;float output_max;
} PI_Controller;float Voltage_PI_Control(PI_Controller *pi, float Vref, float Vdc) {float error = Vref - Vdc;pi->integral += error;// 抗积分饱和if (pi->integral > pi->output_max) pi->integral = pi->output_max;if (pi->integral < -pi->output_max) pi->integral = -pi->output_max;return pi->Kp * error + pi->Ki * pi->integral;
}

2. 电流内环PR控制

typedef struct {float Kp;float Kr;float alpha;
} PR_Controller;float Current_PR_Control(PR_Controller *pr, float Iref, float Ifb, float theta) {// Park变换float Id = Iref * cos(theta) + Ifb * sin(theta);float Iq = -Iref * sin(theta) + Ifb * cos(theta);// PR调节float Vd = pr->Kp * Id + pr->Kr * (Id - Iq);float Vq = pr->Kp * Iq + pr->Kr * (Iq - Id);// 逆Park变换return Vd * cos(theta) - Vq * sin(theta);
}

四、中断服务程序（ADC触发）

interrupt void Adc_isr(void) {// 读取ADC结果（右对齐）float Vdc = (AdcResult.ADCRESULT0 * 3.3f) / 4096.0f;float Ia = (AdcResult.ADCRESULT1 * 3.3f) / 4096.0f;float Ib = (AdcResult.ADCRESULT2 * 3.3f) / 4096.0f;float Ic = (AdcResult.ADCRESULT3 * 3.3f) / 4096.0f;// 锁相环计算相位角static float theta = 0.0f;theta = SRF_PLL(Va, Vb, Vc, theta);  // 基于SRF-PLL的相位同步// 电流指令生成（单位正弦波）float Iref_a = Iref * cos(theta);float Iref_b = Iref * cos(theta - 2*M_PI/3);float Iref_c = Iref * cos(theta + 2*M_PI/3);// 电流环控制float Duty_a = Current_PR_Control(&current_pr, Iref_a, Ia, theta);float Duty_b = Current_PR_Control(&current_pr, Iref_b, Ib, theta);float Duty_c = Current_PR_Control(&current_pr, Iref_c, Ic, theta);// 更新PWM占空比EPwm1Regs.CMPA.half.CMPA = (uint16_t)(Duty_a * EPwm1Regs.TBPRD);EPwm2Regs.CMPA.half.CMPA = (uint16_t)(Duty_b * EPwm2Regs.TBPRD);EPwm3Regs.CMPA.half.CMPA = (uint16_t)(Duty_c * EPwm3Regs.TBPRD);// 清除中断标志PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

五、锁相环（SRF-PLL）实现

float SRF_PLL(float Va, float Vb, float Vc, float theta_prev) {// Clark变换到静止坐标系float alpha = Va;float beta = (Va + 2*Vb) / sqrt(3);// Park变换到旋转坐标系float vd = alpha * cos(theta_prev) + beta * sin(theta_prev);float vq = -alpha * sin(theta_prev) + beta * cos(theta_prev);// PI调节器static float integral = 0.0f;float error = 0.0f;  // 目标vq=0integral += error;float omega = Kp_pll * error + Ki_pll * integral;// 更新相位角float theta = theta_prev + omega * TS_SAMPLE;// 角度归一化if (theta > 2*M_PI) theta -= 2*M_PI;return theta;
}

六、保护机制实现

1. 过流保护（ePWM Trip-Zone）

void EPwm_TripConfig(void) {// 配置TZ模块EPwm1Regs.TZSEL.bit.CBC = 1;    // 比较器B触发保护EPwm1Regs.TZCTL.bit.TZA = 2;    // 过流时强制A通道低电平EPwm1Regs.TZCTL.bit.TZB = 2;    // 过流时强制B通道低电平// 中断配置EPwm1Regs.TZINTSEL.bit.TZIF = 1; // 使能TZ中断EPwm1Regs.TZINTFLG.bit.TZIF = 0; // 清除标志
}interrupt void EPwm_TZ_ISR(void) {// 快速关断所有PWMEPwm1Regs.TZCTL.bit.TZA = 2;EPwm2Regs.TZCTL.bit.TZA = 2;EPwm3Regs.TZCTL.bit.TZA = 2;// 记录故障fault_flag = 1;// 清除中断标志EPwm1Regs.TZINTFLG.bit.TZIF = 0;
}

七、主程序流程

void main(void) {// 系统初始化SystemInit();EPwm1_Init(1000, 0.5f);  // 10kHz, 50%占空比Adc_Init();EPwm_TripConfig();// 主循环while(1) {// 执行后台任务（如通信、数据记录）}
}// 中断向量表配置
#pragma CODE_SECTION(Adc_isr, "ramfuncs");
#pragma INTERRUPT(Adc_isr, 1);

参考代码三相PFC数字控制代码 www.youwenfan.com/contentcns/73162.html