摘要
虚拟同步发电机(virtual synchronous generator,VSG)提高惯量与阻尼的同时也带来了有功振荡问题,特别是在多台VSG并联运行的系统中。首先建立VSG并联系统有功控制环节的小信号模型,再通过根轨迹分析阻尼、惯量和阻抗参数对系统稳定性的影响。进一步,提出一种基于暂态电磁功率补偿的改进VSG控制策略,利用一阶滞后环节构造暂态电磁功率,从而增加系统暂态下的等效阻尼,实现微电网内VSG并联运行时的有功振荡抑制。该策略不会引起稳态偏差,还可以减小动态过程的调节时间和冲击功率。最后,通过MATLAB/Simulink仿真以及StarSim硬件在环半实物实验验证了所提策略的正确性和有效性。
Virtual synchronous generator(VSG) not only provides the inertia and damping, but also has the problem of active power oscillation, especially in the system with multiple VSGs. This paper firstly establishes a small-signal model of the active power control link of the VSG parallel system. Then, the influence of damping, inertia and impedance parameters on the system stability is analyzed through the root locus. Furthermore, an improved VSG control strategy based on the transient electromagnetic power compensation is proposed. The firstorder lag link is used to construct the transient electromagnetic power to increase the equivalent damping of the system under the transient state and realize the active oscillation suppression of the paralleled operation of the VSGs in the microgrid. This strategy reduces the adjustment time and the impulse power of dynamic processes without causing the steady-state deviations. Finally, the correctness and effectiveness of the proposed strategy are verified by the MATLAB/Simulink simulation and the hardware-in-loop experiment on StarSim.
作者
兰征
刘祖潭
何东
曾进辉
余雪萍
龙阳
LAN Zheng;LIU Zutan;HE Dong;ZENG Jinhui;YU Xueping;LONG Yang(College of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou 412007,Hunan Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2023年第1期23-30,共8页
Power System Technology
基金
国家自然科学基金项目(51807058)
湖南省自然科学基金项目(2021JJ50002)
湖南省研究生科研创新项目资助(QL20220234)。
关键词
虚拟同步发电机
小信号模型
根轨迹分析
有功振荡
暂态电磁功率补偿
virtual synchronous generator
small-signal model
root locus analysis
active oscillation
transient electromagnetic power compensation
