光伏模拟器用死区消除PWM整流器运行方式

针对光伏模拟器用单相脉宽调制（PWM）整流器提出电压平方外环电流内环的控制策略，同时揭示直流侧存在2倍基波频率的纹波电压以及此纹波电压对网侧电流的影响。PWM整流器采用的基于H桥死区消除SPWM，在网侧电流非过零区域，各桥臂上下两开关管中，必定存在其中一个开关管驱动信号为低电平，而在电流过零处推导出存在的天然死区时间。由微控制器（MCU）与现场可编程门阵列（FPGA）相结合的控制系统可实现提出的运行方式。实验结果验证了理论推导的正确性以及提出运行方式的有效性。

OPERATION MODE OF PWM RECTIFIER WITH DEAD-TIME ELIMINATION FOR PHOTOVOLTAIC SIMULATOR

In this paper, the control strategy including voltage square outer loop and current inner loop is proposed for single-phase pulse width modulation（PWM） rectifier for photovoltaic simulator. At the same time, the ripple voltage of 2 times the fundamental frequency at the DC side and the influence of this ripple voltage on the current at the network side are revealed. When PWM rectifier adopts the dead time eliminating SPWM based on H-bridge, in the current non-zero crossing area of the grid side, there must be a low drive signal of one of the two switch tubes above and below each bridge arm. At the current zero crossing area, the natural dead time is derived in this paper. The proposed operation mode is realized by the control system combining MCU and PFGA. The correctness of the theoretical derivation and the effectiveness of the proposed operation mode are verified by the experimental results.