基于虚拟同步发电机的微网频率与电压综合控制策略  

Comprehensive control strategy of microgrid frequency and voltage based on virtual synchronous generator

作　　者：苏宏升[1,2] 江昆 杨祯 何开忠 SU Hongsheng;JIANG Kun;YANG Zhen;HE Kaizhong(School of Automation and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Rail Transit Electrical Automation Engineering Laboratory of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,甘肃兰州730070 [2]兰州交通大学甘肃省轨道交通电气自动化工程实验室,甘肃兰州730070

出　　处：《电力自动化设备》2020年第3期21-28,共8页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(61867003,61263004);甘肃省科技计划资助项目(17JR5RA083);兰州交通大学优秀科研团队资助项目(201701)。

摘　　要：为解决微网运行时频率与电压易受负荷波动影响而偏离额定值的问题,提出了一种基于虚拟同步发电机的频率与电压综合控制策略。在对比分析2种选取转子运动方程阻尼环节参考值方案的基础上,取额定角频率为参考值,通过引入虚拟调速器与转子运动方程相结合设计自动发电控制系统来实现频率的无差控制。针对电压信号反馈需要通信系统支持的缺陷,引入修正后的电压幅值估计器来实现对公共耦合点(PCC)电压的精确估计,在自动电压控制器作用下使得微网无需配置通信系统即可实现PCC电压的二次调节,提升了系统的经济性。进一步地,通过建立系统的小信号模型分析了关键参数的变化对系统稳定性的影响。For solving the problem that the frequency and voltage of microgrid are easily affected by load fluctuation and consequently deviate from the rated value,a comprehensive frequency and voltage control strategy based on virtual synchronous generator is proposed. The rated angular frequency is selected as the reference value of the damping link of swing equation based on comparing two cases of the refe-rence value.And then,an automatic generation control system is designed by combining the virtual governor with the swing equation to realize no-error control on frequency. Subsequently,aiming at the defect that the voltage feedback needs the support of communication system,a revised voltage amplitude estimator is introduced to estimate the voltage of PCC(Point of Common Coupling) accurately. Under the action of automatic voltage controller,the secondary voltage regulation of PCC can be accomplished without configuring communication system,so that the economy is improved. Furthermore,the small-signal model of system is derived,and the influences of key parameters on the system stability are analyzed.

关 键 词：虚拟同步发电机 虚拟调速器 电压估计 小信号模型 频率稳定性 电压稳定性 

分 类 号：TM34[电气工程—电机] TM727