摘要
虚拟同步发电机(VSG)通过模拟同步发电机的外特性,有效缓解了可再生能源并网造成的惯性下降问题,但存在并网瞬间冲击电流大的问题。为解决该问题,提出一种基于虚拟功率的VSG预同步控制策略。首先,通过控制虚拟功率为零来实现逆变器输出电压与电网电压的相位与幅值一致,同时无需锁相环节,简化了控制算法,提高了预同步过程的动静态性能。其次,对有功-频率控制器和无功-幅值控制器进行改进,提高了预同步控制精度。最后,通过实验验证了所提预同步控制策略的有效性。
The virtual synchronous generator(VSG)effectively alleviates the inertia drop problem caused by the grid connection of renewable energy by simulating the external characteristics of the synchronous generator,but there is the problem of large inrush current at the moment of grid connection.In order to solve the problem,a VSG presynchronization control strategy based on virtual power is proposed.Firstly,by controlling the virtual power to zero,the phase and amplitude of the inverter output voltage and the power grid voltage are consistent,and there is no need for phase-locking link,which simplifies the control algorithm and improves the dynamic and static performance of the presynchronization process.Secondly,the active power-frequency controller and reactive power-amplitude controller are improved to improve the precision of presynchronization control.Finally,the effectiveness of the proposed presynchronization control strategy is verified through experiments.
作者
柴秀慧
张纯江
杨春来
刚磊
CHAI Xiu-hui;ZHANG Chun-jiang;YANG Chun-lai;GANG Lei(Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province(Yanshan University),Qinhuangdao 066004,China;不详)
出处
《电力电子技术》
CSCD
北大核心
2022年第5期38-40,共3页
Power Electronics
基金
国家自然科学基金(51877187)
河北省自然科学基金(E2018203152)
关键词
虚拟同步发电机
有功-频率控制器
无功-幅值控制器
virtual synchronous generator
active power-frequency controller
reactive power-amplitude controller
作者简介
柴秀慧(1984-),女,讲师,研究方向为风力发电变流器及控制技术和储能系统功率流控制等。
