一种光伏并网的强鲁棒性三相逆变器控制策略分析  

Analysis of a Strong Robust Three-phase Inverter Control Strategy for Grid-connected Photovoltaic

作　　者：黎艳 LI Yan(Sichuan Linshui Qimingxing Electric Power Co.,Ltd.,Guang’an 638000,Sichuan Province,China)

机构地区：[1]国网四川邻水县供电有限责任公司,四川广安638000

出　　处：《发电设备》2025年第2期95-104,共10页Power Equipment

摘　　要：并网逆变器是直流(DC)与交流(AC)转换的核心,其性能优劣直接关系光伏并网的工作效率和电力系统的电能质量。但是,在逆变器长期服役过程,直流电压波动、电网扰动等不稳定因素对逆变器的控制策略提出了更高要求。系统分析了三相逆变器的电压电流闭环控制机理及其等效模型,并且结合比例-积分-微分(PID)控制器和前馈控制思想提出了强鲁棒性闭环控制策略。同时,基于等效模型和功率消耗情况,完善了滤波电路中电感和电容的设计。最后,利用MATLABSimulink软件搭建了完整的仿真电路模型,对闭环控制电路的工作性能和滤波器滤波效果进行了综合分析。结果表明:该控制策略的去扰动时间不超过0.02s,并且输出电压与电流的同步性良好;逆变器输出电压和电流的谐波畸变率不超过1%,并且三相电压与电流的电能质量均表现良好。Grid-connected inverter is the core of direct current(DC)and alternating current(AC)conversion,and its performance is directly related to the efficiency of grid-connected photovoltaic and the power quality of the power system.However,during the long-term service of the inverter,the instability factors such as DC voltage fluctuation and power grid disturbance put forward higher requirements for the control strategy of the inverter.The voltage and current closed-loop control mechanism and its equivalent model of three-phase inverter were analysed systematically,and the strong robust closed-loop control strategy was proposed by combining the proportional-integral-derivative(PID)controller and feedforward control idea.At the same time,based on the equivalent model and power consumption,the design of inductance and capacitance in the filter circuit was improved.Finally,a complete simulation circuit model was built by using MATLAB Simulink software,and the performance of closed-loop control circuit and the filtering effect of filter were analysed comprehensively.Results show that,the disturbance removal time of the control strategy does not exceed 0.02 s,and it has good synchronization between output voltage and current.The harmonic distortion rate of the output voltage and current of the inverter is less than 1%,and the power quality of the three-phase voltage and current is good.

关 键 词：光伏发电 三相逆变器 闭环控制 LC型滤波器 

分 类 号：TM615[电气工程—电力系统及自动化] TM464