[参考译文] TMS320F280039C：SFRA 开环

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Other Parts Discussed in Thread: SFRA

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https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1105081/tms320f280039c-sfra-open-loop

器件型号：TMS320F280039C
主题中讨论的其他器件：SFRA

我不确定我的 SFRA 是否正确配置。我将其用于光伏逆变器、基于 TMDSSOLAR (P/C) EXPKIT。我想在开环中对 SFRA 进行导通、以便对电流环路控制器进行调优。我的输出电压波没有干扰。尽管在我打开 SFRA 之后，它看起来不像稳定的系统。

输出电压：

我的 SFRA 输出为：

当 I SFRA 从其他项目输出时、线比我的项目更平坦、这只是开环。

我遵循用户指南中的实施方案、并检查其他设计中的示例项目和实施方案。

我的实施：

void A1(void)  // Dash Board Measurements
//--------------------------------------------------------
{
    SFRA_F32_runBackgroundTask(&sfra1);
    SFRA_GUI_runSerialHostComms(&sfra1);

    //-------------------
    //the next time CpuTimer0 'counter' reaches Period value go to A2
    A_Task_Ptr = &A2;
    //-------------------
}

(...)
interrupt void inverterISR(void)
{
 invDutyPU = SFRA_F32_inject(invSine * invModIndex);


    invDuty= ((float32_t)(INV_PWM_PERIOD)) * (fabsf(duty));

    if(duty>=0)
    {
        EPWM_setCounterCompareValue(base1,EPWM_COUNTER_COMPARE_A,0);
        EPWM_setCounterCompareValue(base2,EPWM_COUNTER_COMPARE_A,invDuty);
     }
    else
    {
        EPWM_setCounterCompareValue(base1,EPWM_COUNTER_COMPARE_A,invDuty);
        EPWM_setCounterCompareValue(base2,EPWM_COUNTER_COMPARE_A,0);
    }
 
 
 SFRA_F32_collect(&invDutyPU,&inv_meas_cur_diff_inst);
 }
 
 
 
 void setupSFRA(void)
{
    //
    //Resets the internal data of sfra module to zero
    //
    SFRA_F32_reset(&sfra1);
    //
    //Configures the SFRA module
    //
    SFRA_F32_config(&sfra1,
    INV_PWM_SWITCHING_FREQUENCY,
    SFRA_AMPLITUDE,
    SFRA_FREQ_LENGTH,
    SFRA_FREQ_START,
    SFRA_FREQ_STEP_MULTIPLY,
    plantMagVect,
    plantPhaseVect,
    olMagVect,
    olPhaseVect,
    clMagVect,
    clPhaseVect,
    freqVect,
    1);
    //
    //Resets the response arrays to all zeroes
    //
    SFRA_F32_resetFreqRespArray(&sfra1);
    //
    // Initializes the frequency response array ,
    // The first element is SFRA_FREQ_START
    // The subsequent elements are freqVect[n-1]*SFRA_FREQ_STEP_MULTIPLY
    // This enables placing a fixed number of frequency points
    // between a decade of frequency.
    // The below routine can be substituted by a routine that sets
    // the frequency points arbitrarily as needed.
    //
    SFRA_F32_initFreqArrayWithLogSteps(&sfra1,
                                        SFRA_FREQ_START,
                                        SFRA_FREQ_STEP_MULTIPLY);

    //
    // configures the SCI channel for communication with SFRA host GUI
    // to change SCI channel change #define in the sfra_gui_scicomms_driverlib.c
    // the GUI also changes a LED status, this can also be changed with #define
    // in the file pointed to above
    //
    SFRA_GUI_config(SFRA_GUI_SCI_BASE,
                    SysCtl_getLowSpeedClock(DEVICE_OSCSRC_FREQ),
                    SFRA_GUI_SCI_BAUDRATE,
                    SFRA_GUI_SCIRX_GPIO,
                    SFRA_GUI_SCIRX_GPIO_PIN_CONFIG,
                    SFRA_GUI_SCITX_GPIO,
                    SFRA_GUI_SCITX_GPIO_PIN_CONFIG,
                    SFRA_GUI_LED_INDICATOR,
                    SFRA_GUI_LED_GPIO,\
                    SFRA_GUI_LED_GPIO_PIN_CONFIG,
                    &sfra1,
                    (uint32_t)1);
}





// DEFINES:

#define INV_PWM_SWITCHING_FREQUENCY 20000
#define SFRA_FREQ_START 100 
#define SFRA_FREQ_STEP_MULTIPLY (float32_t)1.059253 // 1.05
#define SFRA_AMPLITUDE (float32_t)0.01 //0.05

#define SFRA_GUI_VBUS_CLK 50000000
#define SFRA_FREQ_LENGTH 100

3 年多前