一种高性能单相正弦逆变电源的多环控制策略

A Multiloop Feedback Control Strategy for High-Performance Single-Phase Power Supply Through Sinusoidal Inverter

针对单相正弦逆变电源提出一种多环反馈模式的控制方案.外环采用两个PI控制器对幅值和相位独立控制以确保逆变电源输出电压的稳态精度;内环采用输出电压反馈以保证电源输出的快速响应能力和减少波形的畸变.针对逆变电源输出正弦电压相位检测问题提出了一种新颖的算法,使高精度逆变控制易于实现.仿真实验表明,以所提方案构建的控制系统具有良好的动态和静态特性,在任意负载条件下,输出电压波形均能保持良好的正弦度.

A multiple feedback loop control scheme is presented for single-phase power supply through sinusoidal inverter. The proposed outer control loop uses two PI controllers for the independent control as magnitude/phase to ensure a highly steady precision of the voltage output from inverted power supply. The inner control loop uses voltage output as a feedback to ensure a fast response to the voltage output and reduce waveform distortion. A new algorithm is proposed to detect the phase of sinusoidal voltage output from the inverted power supply so as to make the high-precision control of power supply inversion easy to implement. The simulation results verify that the control system based on the proposed method has excellent dynamic/static characteristics to keep all voltage output waveforms highly sinusoidal under any loading conditions.