多虚拟同步发电机并联系统的改进控制策略
摘要:针对多虚拟同步发电机(virtual synchronous generator，VSG)并联系统中存在环流及功率不能按比例分配的问题，提出一种改进的功率分配策略。首先，改进并联预同步策略，通过对有功环添加频率补偿使机台平滑、稳定并入系统，减少并联瞬间电流冲击带来的功率震荡。其次，通过环流分析，提出在每台VSG无功环上添加电压补偿，保障各VSG输出电压一致，减少系统环流，提高功率精分度，通过小信号分析，验证控制策略的正确性。最后，分析得出VSG参数与功率按比例分配的关系，在Matlab/Simulink中搭建3台VSG并联模型，仿真验证了所提控制策略的可行性，其实现了机台功率按不同容量比分配，且在面对负荷突变时依然能稳定运行。
Abstract：Aiming at the existence of circulation and nonproportional power distribution in the parallel system with multiple virtual synchronous generators (VSGs), an improved power distribution strategy is proposed. Firstly, the parallel pre-synchronization strategy is improved by adding frequency compensation to the active loop to smoothly and steadily integrate the machine into the system and reduce the power oscillation caused by the instantaneous current shock of the parallel connection. Secondly, through the circulation analysis, it is proposed to add voltage compensation to the reactive loop of each VSG, which can guarantee the same output voltage of each VSG, suppress the system circulation, and improve the power distribution accuracy. The correctness of the control strategy is verified through small signal analysis. Finally, the relationship between VSG parameters and proportional power distribution is analyzed. A model of three VSGs in parallel is built in Matlab/Simulink to verify the feasibility of the proposed control strategy, which enables the power to be distributed according to different capacity ratios, and can still operate stably in the face of sudden load changes.
标题：多虚拟同步发电机并联系统的改进控制策略
title:Improved Control Strategy of Multi Virtual Synchronous Generators Parallel System
作者：施凯,赵棒棒,徐培凤,孙宇新,任明炜
authors:SHI Kai,ZHAO Bangbang,XU Peifeng,SUN Yuxin,REN Mingwei
关键词：并联虚拟同步发电机(VSG),环流,预同步,功率分配,
keywords:parallel virtual synchronous generator (VSG),circulating current,pre-synchronization,power allocation,
发表日期：2023-05-12
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