大扰动时交流微电网的运行与控制研究综述  

Review on Operation and Control of AC Microgrid Under Large Disturbance

作　　者：沈霞 帅智康[1] 沈超 葛俊[1] 黄文[1] SHEN Xia;SHUAI Zhikang;SHEN Chao;GE Jun;HUANG Wen(National Electrical Power Conversion and Control Engineering Technology Research Center(Hunan University),Changsha 410000,China)

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),湖南省长沙市410082

出　　处：《电力系统自动化》2021年第24期174-188,共15页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51977066);湖南省研究生科研创新项目(CX20200433)资助。

摘　　要：交流微电网是促进新能源消纳、缓解能源危机与环境问题的有效手段。分布式微源是微电网的重要组成部分,一般通过电力电子接口逆变器并入电网。因而,微电网的运行特性受微源接口逆变器控制主导,呈现惯性小、过流能力弱、非线性强、抗干扰能力差等特征。这些特征导致微电网在大扰动时易发生逆变器烧毁甚至不可逆失稳等问题,严重影响微电网安全稳定运行。针对大扰动时交流微电网的运行与控制问题,首先分别从微电网电流特性与稳定运行特性2个角度进行总结。然后,梳理了微电网典型限流控制策略以及稳定性提升控制策略的研究现状,包括其主要适用场景及优缺点。最后,从多物理场耦合、多时间尺度交互、系统稳定判据、信息物理安全等方面探讨了微电网安全可靠运行所面临的主要挑战,并展望了微电网智能化、高可靠供电的发展前景。AC microgrid is an effective means to promote the consumption of renewable energy and alleviate the energy crisis and environmental issues.Distributed micro-source is the significant element of microgrids,which is usually integrated to the power grid through the power-electronic-interfaced inverter.Therefore,the operation characteristics of microgrids are dominated by microsource-interfaced inverter control,presenting the features of weak inertia,limited overcurrent capability,strong nonlinearity,and poor anti-interference performance.These characteristics can easily lead to the problems such as the burnout of inverter and even irreversible instability of the microgrid under large disturbances which severely threaten the safe and stable operation of the microgrid.In order to solve the operation and control problems of AC microgrid under large disturbance,this paper firstly summarizes the current characteristics and stable operation characteristics of microgrids.Then,the research status of typical current limiting control strategies and stability improvement technologies of microgrids is summarized including their main application scenarios,advantages and disadvantages.Finally,the main challenges faced by the safe and reliable operation of microgrids are discussed from the perspective of multi-physics coupling,multi-time scale interaction,system stability criteria,cyber-physical security,etc.The development prospect of intelligent and high reliable power supply of microgrid is prospected.

关 键 词：交流微电网 大扰动 输出电流特性 失稳机理 限流控制 稳定提升控制 

分 类 号：TM721.2[电气工程—电力系统及自动化]