基于相位与幅值补偿的虚拟同步发电机低电压穿越控制  

Low voltage ride-through control of virtual synchronous generator based on phase and amplitude compensation

作　　者：陈智勇 董新伟[1] 李传辉 王志超 赵明[1] 杜秀稳 CHEN Zhiyong;DONG Xinwei;LI Chuanhui;WANG Zhichao;ZHAO Ming;DU Xiuwen(School of Electrical Engineering,China University of Mining and Technology,Xuzhou 221008,China)

机构地区：[1]中国矿业大学电气工程学院,江苏徐州221008

出　　处：《电力工程技术》2024年第3期42-51,共10页Electric Power Engineering Technology

基　　金：国家重点研发计划资助项目(2021YFC3100300)。

摘　　要：虚拟同步发电机(virtual synchronous generator,VSG)通过模拟同步发电机的工作原理,引入虚拟惯量与阻尼系数,提高了分布式电源并网的稳定性。但是当电网发生电压跌落时,电压的跌落与恢复均会使电网电压的相位与幅值发生跳变,而传统的VSG控制策略难以解决该问题。为此,文中提出一种基于相位与幅值补偿的VSG低电压穿越控制方法。首先,分析电网电压跌落与恢复对电网造成的不同影响。其次,在电网电压跌落期间,通过将VSG输出电压和电网电压之间的相位与幅值差控制在允许范围内来实现过流抑制、输出功率的快速稳定以及无功补偿的目的。然后,在电网电压恢复时,通过快速补偿消除VSG输出电压和电网电压之间的相位与幅值差,从而抑制因电网电压跳变而造成的过流等问题。最后,通过MATLAB/Simulink仿真验证所提控制策略的有效性。根据仿真结果可知,文中提出的控制策略可以有效抑制过流的产生并且能够实现无功补偿。Virtual synchronous generator(VSG) enhances the stability of distributed power sources during grid connection by simulating the operating principle of a synchronous generator and introducing the virtual inertia and damping coefficient.However the traditional VSG control strategy struggles to address abrupt changes in grid voltage phase and amplitude when the voltage drops in the grid.Therefore,a low voltage ride-through control method for VSG based on phase and amplitude compensation is proposed.Firstly,the different effects of voltage drops and recovery on the power grid are analyzed.Secondly,during voltage drops,the purposes of overcurrent suppression,rapid stabilization of output power,and reactive power compensation are achieved by controlling the phase and amplitude difference between VSG output voltage and grid voltage within the allowable range.Then,during voltage recovery,rapid compensation eliminates the phase difference and amplitude difference between VSG output voltage and grid voltage to suppress overcurrent and other problems caused by grid voltage jumps.Finally,the effectiveness of the proposed control strategy is verified by MATLAB/Simulink simulation.The simulation results show that it can effectively suppress the overcurrent and realize reactive power compensation.

关 键 词：虚拟同步发电机(VSG) 低电压穿越 相位与幅值跳变 相位与幅值补偿 过流抑制 功率稳定 无功补偿 

分 类 号：TM341[电气工程—电机] TM464