基于虚拟惯量和阻尼参数自适应策略的直流微网电压控制研究  

RESEARCH ON VOLTAGE REGULATION CONTROL OF DC MICROGRID BASED ON VIRTUAL INERTIAAND DAMPING PARAMETERS’ADAPTIVE STRATEGY

作　　者：左芸裴 王德林[1] 周鑫 李京华 胡杰 陆佳怡 Zuo Yunpei;Wang Delin;Zhou Xin;Li Jinghua;Hu Jie;Lu Jiayi(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China;Yunnan Power Grid Co.,Ltd.Electric Power Research Institute,Kunming 650217,China)

机构地区：[1]西南交通大学电气工程学院,成都611756 [2]云南电网有限责任公司电力科学研究院,昆明650217

出　　处：《太阳能学报》2023年第11期485-494,共10页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51777176)。

摘　　要：含大功率风光储的直流微电网具有“小惯量、弱阻尼”的典型特性,系统受到扰动后,会导致直流母线电压剧烈波动。为此,该文提出一种改进的虚拟惯量和阻尼参数自适应控制策略。首先,在类虚拟同步发电机控制中加入电压补偿环节,消除了控制带来的电压调节静差;然后,使虚拟惯量和阻尼参数自适应响应直流电压变化,并在虚拟惯量的自适应控制中考虑变换器输出功率限制的影响,在平抑电压波动的同时,兼顾了变换器的长期安全运行。为保证控制参数选取的合理性,该文建立了所提控制策略的小信号分析模型,通过绘制根轨迹图分析其主要参数对系统稳定性的影响。最后,通过仿真算例,验证了该改进控制策略的有效性。The DC microgrid with high-power wind and solar energy storage has the typical characteristics of"small inertia,weak damping".After the system is disturbed,it will cause the DC bus voltage to fluctuate violently.Therefore,this paper proposes an adaptive control strategy to improve the virtual inertia and damping parameters.Firstly,a voltage compensation link is added to the control of similar virtual synchronous generator to eliminate the voltage regulation static error caused by the control.Then the virtual inertia and damping parameters are made to respond to the DC voltage fluctuation adaptively,and the influence of the output power limitation of the converter is considered in the adaptive control of the virtual inertia,which not only suppresses the DC voltage fluctuation,but also takes into account the long-term safe operation of the converter.In order to ensure the reasonable selection of control parameters,this paper establishes a small signal analysis model of the control strategy,and analyzes the influence of the main parameters on the stability of the system by drawing the root locus diagram.Finally,the effectiveness of the improved control strategy proposed in this paper is verified by a simulation example.

关 键 词：微电网 电压控制 自适应控制系统 直流系统 虚拟惯性和阻尼 小信号分析 

分 类 号：TM721[电气工程—电力系统及自动化]