孤网中虚拟同步发电机并联均流控制策略  

Average-current Control Strategy of Parallel VSGs in Isolated System

作　　者：叶哲琳 侯凯[1] 何安然 蒋应伟[1] 刘建平[1] 卢方舟 YE Zhelin;HOU Kai;HE Anran;JIANG Yingwei;LIU Jianping;LU Fangzhou(NARI Group Corporation,State Grid Electric Power Research Institute,Nanjing 211106,Jiangsu,China)

机构地区：[1]南瑞集团公司国网电力科学研究院,江苏南京211106

出　　处：《电气传动》2018年第9期72-76,共5页Electric Drive

基　　金：南瑞集团科技项目(WBS-524609160049)

摘　　要：在虚拟同步发电机(VSG)技术的推广中,集中式大容量储能VSG装置具有一定工程优势,在此装置中VSG多以并联形式存在且彼此距离较近,由装置及线路参数的差异所引起的环流会对其正常运行产生影响。以2台VSG并联的孤网为例,分析并联功率分配机理,推导其与均流对应关系。考虑等效线路阻抗差异性对功率均分的影响,设计VSG调速控制和励磁控制,实现并联VSG输出有功、无功功率按额定容量分配,并使其具备有功调频、无功调压的能力及大惯性、大输出阻抗的优势,同时应用自动控制相关原理给出稳态时实现功率均分的数学依据。最后由Matlab/Simulink仿真验证控制策略的有效性。In the application of VSG,centralized energy storage VSG with large capacity has certain engineering advantages.In this device,VSGs always operate in paralleled mode and are close to each other,circulation current resulted from the parameter difference of device and line impedance may have an influence on normal operation.Based on a small isolated system which contains two VSGs in parallel,the mechanism of power distribution was analyzed,and then the corresponding relation between the power distribution and the current sharing was derived.Considering the influence of the differences between equivalent impedances of the parallel lines on the power sharing,speed control and excitation control of VSG were designed.The VSG designed could share the load power by the ratio of rated capacity accurately,regulate frequency and voltage separately by controlling active power and inactive power and provide the large inertia and output impedance.With the application of automatic control principle,mathematic interpretation was provided for the reason of accuracy of the power distribution in steady state.The simulation were given to verify the validity and reliability of the proposed strategy.

关 键 词：虚拟同步发电机 功率分配 均流控制 调速控制 励磁控制 虚拟电感 

分 类 号：TM464[电气工程—电器]