In this paper,a grid voltage sensorless model predictive control is proposed and verified by simulation and experimental tests for a PWM rectifier.The presented method is simple and cost effective due to no need of mo...In this paper,a grid voltage sensorless model predictive control is proposed and verified by simulation and experimental tests for a PWM rectifier.The presented method is simple and cost effective due to no need of modulator and voltage sensors.The developed sliding mode voltage observer(SMVO)can theoretically track the grid voltage accurately without phase lag and magnitude error.Based on the proposed SMVO,the finite control set-model predictive control(FCS-MPC)is incorporated for power regulation.The active power and reactive power are calculated and predicted using the measured current and the estimated grid voltage from the SMVO.With the predicated power for one-step delay compensation,the best voltage vector minimizing the tracking error is selected by FCS-MPC.The whole algorithm is implemented in stationary frame without using Park's transformation.Both the simulation and experimental results validate the effectiveness of the proposed method.展开更多
有限集模型预测控制(finite control set model predictive control,FCS-MPC)处理优化问题有较大优势,但其控制精度在低采样频率下会急剧下降。以三相电压源整流器为例,现有解决方法多采用扩充矢量或改用调制型预测控制(modulated model...有限集模型预测控制(finite control set model predictive control,FCS-MPC)处理优化问题有较大优势,但其控制精度在低采样频率下会急剧下降。以三相电压源整流器为例,现有解决方法多采用扩充矢量或改用调制型预测控制(modulated model predictive control,M-MPC),其本质在于通过增加开关频率提升控制精度,并未起到优化效果。为解决FCS-MPC在低采样频率下控制效果差的问题,同时为了能以较低的开关频率最大限度地提升控制精度,在分析FCS-MPC开关频率与控制误差间非线性关系的基础上,提出一种新的控制集扩充方法。通过构建12个新的电压矢量来扩充控制集,显著提升了FCS-MPC在低采样频率下的控制精度,且带来的开关频率增加较小。同时,在相同开关频率下,所提方法能够取得更优于M-MPC的控制效果。此外,通过调节目标矢量的权重还可改变其扩充模式,保留了FCS-MPC简单、直接的特点。最后,通过对比仿真及实验验证所提方法的有效性。展开更多
文摘In this paper,a grid voltage sensorless model predictive control is proposed and verified by simulation and experimental tests for a PWM rectifier.The presented method is simple and cost effective due to no need of modulator and voltage sensors.The developed sliding mode voltage observer(SMVO)can theoretically track the grid voltage accurately without phase lag and magnitude error.Based on the proposed SMVO,the finite control set-model predictive control(FCS-MPC)is incorporated for power regulation.The active power and reactive power are calculated and predicted using the measured current and the estimated grid voltage from the SMVO.With the predicated power for one-step delay compensation,the best voltage vector minimizing the tracking error is selected by FCS-MPC.The whole algorithm is implemented in stationary frame without using Park's transformation.Both the simulation and experimental results validate the effectiveness of the proposed method.
文摘有限集模型预测控制(finite control set model predictive control,FCS-MPC)处理优化问题有较大优势,但其控制精度在低采样频率下会急剧下降。以三相电压源整流器为例,现有解决方法多采用扩充矢量或改用调制型预测控制(modulated model predictive control,M-MPC),其本质在于通过增加开关频率提升控制精度,并未起到优化效果。为解决FCS-MPC在低采样频率下控制效果差的问题,同时为了能以较低的开关频率最大限度地提升控制精度,在分析FCS-MPC开关频率与控制误差间非线性关系的基础上,提出一种新的控制集扩充方法。通过构建12个新的电压矢量来扩充控制集,显著提升了FCS-MPC在低采样频率下的控制精度,且带来的开关频率增加较小。同时,在相同开关频率下,所提方法能够取得更优于M-MPC的控制效果。此外,通过调节目标矢量的权重还可改变其扩充模式,保留了FCS-MPC简单、直接的特点。最后,通过对比仿真及实验验证所提方法的有效性。
