带阻抗观测器的单相逆变器抗扰控制  

Control strategy for single inverter with impedance observer

作　　者：闫士杰[1] 闫伟航 冷冰[1] 陈宏志[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110819

出　　处：《电机与控制学报》2014年第7期44-50,59,共8页Electric Machines and Control

基　　金：辽宁省自然科学基金(20102068);沈阳科技计划-应用基础研究专项(F13-316-1-53)

摘　　要：针对以单相逆变器为功率接口的太阳能发电系统中电能的快速随机波动和非线性负载接入时产生的谐波问题,提出一种基于阻抗观测器的抗扰控制策略。该策略主要把造成逆变器输出电压的波动和产生的谐波等随机量作为一种干扰,将谐波的影响、温度变化的影响、线路和滤波器的阻抗参数变化等引起的电压变化量等效为阻抗上的电压降。通过构造的阻抗观测器来估算出产生压降的等效电阻、等效电感和等效电容,然后应用抗扰控制器来消除干扰,自动补偿输出电压变化,使逆变器输出标准正弦波,提高电能质量。仿真和实验结果表明,不论是逆变器直流侧电压波动,还是非线性负载的接入,逆变器都能够输出标准电压正弦波。In solar energy generation system, the single-phase inverter is a power interface, so the power energy is rapidly stochastic fluctuated and the harmonics are generated. In order to solve these problems, a disturbance rejection control strategy based on impedance observer was proposed. In this strategy, the stochastic variable was regarded as an interference which mainly caused the inverter output voltage fluctu-ation and harmonics. Meantime, the output voltage variance caused by harmonics, temperature change and impedance parameters change of line and filter were regarded as an impedance voltage. Through constructed impedance observer, the equivalent resistance, equivalent inductance and equivalent capacitance were estimated. Then by utilizing the disturbance rejection controller, the interference was eliminated and output voltage variance was automatically compensated, so as to make the inverter outputs the standard sinusoidal waveform and improve the quality of electric energy. The results of simulation and experimental show that the inverter outputs normal voltage sinusoidal waveform in fluctuating of DC link voltage of inverter or of connection of nonlinear load.

关 键 词：单相逆变器 抗扰控制器 阻抗观测器 扩张状态观测器 波形跟踪 

分 类 号：TM464[电气工程—电器]