摘要
以新能源为主的微电网惯量小、阻尼弱,而虚拟同步发电机(VSG)是增强惯性和阻尼以提高微电网稳定性的有效手段,但同时引入同步机类似的功角振荡问题。该文提出一种优化VSG惯量和阻尼的自适应控制策略,改善小干扰稳定和暂态稳定。首先,建立虚拟同步发电机控制模型,在虚拟惯量控制中引入双曲正弦函数(tanh)优化惯量,通过等面积定则分析,验证优化惯量控制的正确性;在虚拟阻尼中引入灵活切换暂态阻尼和稳态阻尼控制环节,采用根轨迹分析论证优化阻尼方法的有效性。然后,根据频域特性指标,采用主极点法设计控制参数。最后,通过Simulink仿真,验证提出的优化方法对提高小干扰稳定和暂态稳定的有效性。
The microgrid based on new energy has small inertia and weak damping,while virtual synchronous generator(VSG)is an effective means to enhance inertia and damping to improve the stability of micro-grid,but at the same time,it introduces the power angle oscillation problem similar to that of synchronous generator.This paper presents an adaptive control strategy to optimize VSG inertia and damping to improve small-signal and transient stability.Firstly,the control model of virtual synchronous generator is established,and the hyperbolic sine function(tanh)is introduced to optimize the inertia in the virtual inertia control.The correctness of the optimized inertia control is verified by the equal area rule analysis.The flexible switching transient damping and steady damping control links are introduced into the virtual damping,and the effectiveness of the optimized damping method is demonstrated by root locus analysis.According to the frequency domain characteristic index,the main pole method is used to design the control parameters.Finally,the effectiveness of the proposed optimization method to improve static stability and transient stability is verified by Simulink simulation.
作者
杨效
曾成碧
苗虹
赖辉
吴雪峰
Yang Xiao;Zeng Chengbi;Miao Hong;Lai Hui;Wu Xuefeng(College of Electrical Engineering,Sichuan University,Chengdu 610065,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2023年第11期495-504,共10页
Acta Energiae Solaris Sinica
基金
四川省重点研发项目(2022YFG0300,23ZDYF0508)。
关键词
微电网
自适应控制系统
稳定性
虚拟同步发电机
microgrid
adaptive control systems
stability
virtual synchronous generator
