矩阵变换器的谐波注入PWM控制策略

Harmonic injected PWM control strategy for matrix converter

在矩阵变换器间接变换法等效的交直和直交2个虚拟的环节上,分别采用不控整流和谐波注入PWM(HIPWM)2种简单易实现的调制方式。在三相输入电压是对称或非对称的情况下,虚拟整流环节输出的是直流波动电压,为消除此直流波动电压对虚拟逆变环节HIPWM输出的电压波形的影响,利用开关函数概念推导了对HIPWM的调制波进行补偿的补偿函数,此控制策略的硬件实现电路非常简单。应用MATLAB/Simulink进行了仿真,仿真结果表明:应用HIPWM控制策略,矩阵变换器的电压增益能够达到理论最大值0.866,输出电压中不含低次谐波,验证了所提控制算法的正确性和有效性。

The non-controlled rectification and HIPWM（Harmonic Injected PWM） are respectively applied to the virtual rectifier and virtual inverter of equivalent AC/DC/AC model for matrix converter. The virtual rectifier generates fluctuant DC voltage when symmetric or asymmetric three-phase voltages are supplied. The compensation function is deduced based on the concept of switching function for compensating the modulation wave to eliminate the effect of fluctuant DC voltage on the HIPWM output voltage of virtual inverter. Its hardware implementation is very simple. Results of simulation with MATLAB/Simulink show that,the voltage gain of matrix converter can reach to 0.866,the theoretical maximum,and there is no low- order harmonics in its output voltage,verifying the correctness and effectiveness of the proposed control strategy.