分布式发电并网逆变器的虚拟电机自然坐标控制  

Virtual-machine Natural Coordinate Control of Grid-connected Inverters in Distributed Power Systems

作　　者：卢子广[1] 王淼[1] 胡立坤[1] 朱绯[1] 胡东[1] 

机构地区：[1]广西大学电气工程学院,广西壮族自治区南宁市530004

出　　处：《中国电机工程学报》2014年第36期6435-6441,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51177018);广西科学研究与技术开发项目(1377001-2)~~

摘　　要：向电网传送有功电能的并网逆变器结构简单,但不能控制和改善电网中的电能质量。针对分布式发电中源/荷的不确定性问题,该文基于配电网静止同步补偿器(distribution static synchronous compensator,DSTATCOM),采用类似于交流电机磁链观测的方法,构造出虚拟电机磁链作为逆变器的定向矢量,既能省掉交流侧电压传感器,又能滤除一部分谐波;同时,abc自然坐标控制实现了有功和无功的独立控制,无需任何坐标变换,计算简单,易于实现,节约时间。仿真和实验结果均表明无电压传感器的虚拟电机自然坐标控制策略能够有效维持公共耦合点(point of common coupling,PCC)电压的稳定。系统能够快速补偿无功电流,具有良好的动、静态特性和鲁棒性。The structure of grid-connected inverters which transport active power to grids is simple, but it cannot control or improve power quality. Focusing on uncertainty of sources and loads for distributed generation, based on distribution static synchronous compensators（DSTATCOMs）, virtual-machineflux vectors which may serve as the oriented vectors of the inverters were similarly constructed in this paper according to the observations of flux linkages in AC motors. As a result, the AC voltage sensors are cancelled and some of harmonic is eliminated effectively. Meanwhile, the independent control for active and reactive power is implemented in the abc natural coordinate. The method is simple, saving time, and do not need to change the coordinate. It can keep the voltages constant at the point of common coupling（PCC）. Simulation and experimental results verify the effectiveness of the proposed reactive power compensation technique without voltage sensors in the abc natural coordinate. The system can produce compensated reactive currents quickly, and has excellent dynamic and static performances.

关 键 词：分布式发电 并网逆变器 配电网静止同步补偿器 虚拟电机 自然坐标 电压稳定 

分 类 号：TM464[电气工程—电器]