摘要
针对使用虚拟同步发电机策略控制储能变流器时,孤岛微电网中采用常数阻尼系数控制会导致稳态有功功率偏差的问题,首先建立了基于虚拟同步发电机控制的储能变流器小信号模型,分析了并网模式和孤岛模式下阻尼系数对有功功率振荡的影响规律,然后提出了一种改进的基于稳态频率差值补偿的阻尼控制方法。之后研究了改进阻尼控制对系统稳定性和动态特性的影响,通过仿真和实验验证了改进的阻尼控制可以解除阻尼对稳态有功下垂特性的影响,在保证不影响稳态有功功率分配的前提下有效抑制系统振荡。
In order to solve the problem of steady-state active power deviation caused by constant damping coefficient control in island microgrid when using virtual synchronous generator strategy to control energy storage converter, a small signal model of energy storage converter based on virtual synchronous generator control is established, and the influence of damping coefficient on active power oscillation in grid-connected mode and island mode is analyzed. Then an improved damping control method based on steady-state frequency difference compensation is proposed. After that, the influence of the improved damping control on the stability and dynamic characteristics of the system is studied. Simulation and experiment prove that the improved damping control can eliminate the influence of the damping on steady-state active power sag characteristics, and effectively suppress the system oscillation without affecting the steady-state active power distribution.
作者
许崇福
李菀茹
徐宁一
王弋飞
刘永慧
宁改娣
王跃
XU Chongfu;LI Wanru;XU Ningyi;WANG Yifei;LIU Yonghui;NING Gaidi;WANG Yue(Xi’an XD Electric Research Institute Co.,Ltd.,Xi’an 710075,Shaanxi Province,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi Province,China;State Grid Ningbo Power Supply Company,Ningbo 315000,Zhejiang Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2020年第5期1656-1663,共8页
Power System Technology
基金
国家自然科学基金项目(51777159)
中央高校基本科研业务费专项资金项目(xzy022019035)。
关键词
储能变流器
虚拟同步发电机
阻尼系数
小信号模型
功率分配
energy storage converter
virtual synchronous generator
damping coefficient
small signal model
power distribution
