输入不平衡时双级矩阵变换器的比例谐振控制

Proportional Resonant Control for Two Stage Matrix Converter under Unbalanced Supply Condition

针对三电平双级矩阵变换器的不平衡输入情况,提出一种逆变级比例谐振(Proportional Resonant,PR)控制策略。采用电压闭环PR实现对输出电压的无静差控制,从而抑制输入电压不平衡对输出性能的影响。该策略无需多次坐标变换,且在逆变级采用60°坐标系空间矢量脉宽调制方式,控制策略运算简单、易于数字化实现。与传统PI控制相比,该策略不仅能够有效抑制输入电压不平衡对输出性能的影响,而且降低了输出电流低次谐波含量,使系统具有良好的稳态性能和抗扰性能。

Considering the unbalanced input condition, this paper proposes a proportional resonant （PR） control- ler for inverter of the three level two-stage matrix converter is proposed. The PR control with voltage control loop is adopted to implement the zero steady-state error control of the output voltage, thus restrain the impact of unbalanced input voltage to output performance effectively. This control mode does not need multiple coordinate transformation, and the space vector pulse width modulation based on 60° coordinate system is used with the inverter of three level two-stage matrix converter, the control strategy is simple in operation and easy to realized digitally. Compared with the conventional proportional integral （PI） control, this strategy not only restrains the impact of the unbalanced input voltage to output performance effectively, but also decreases the low-order harmonic of output current signifi- cantly. The system has a good steady-state performance and anti-disturbance property.