不平衡负载下虚拟同步发电机的运行控制策略  

THE VIRTUAL SYNCHRONOUS GENERATOR OPERATION CONTROL STRATEGY UNDER UNBALANCED LOAD CONDITIONS

作　　者：石荣亮 张兴[1] 胡超[1] 徐海珍[1] 刘芳[1] 倪华[2] 

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009 [2]合肥阳光电源股份有限公司,合肥230088

出　　处：《太阳能学报》2017年第11期2964-2971,共8页Acta Energiae Solaris Sinica

基　　金：国家高技术研究发展(863)计划(2015AA050607);光伏微电网关键技术研究及逆变设备研制项目(JZ2015KJGY0557)

摘　　要：在分析不平衡负载下三相微源变流器输出电压不平衡产生机理的基础上,建立虚拟同步发电机(virtualsynchronous generator,VSG)模型。以VSG输出对称三相电压为控制目标,在正、负序同步旋转坐标系下采用正、负序值控制的不平衡补偿策略,并给出VSG负序电压指令。为实现负序电压的准确跟踪,采用负序坐标系下的比例复数积分(proportional complex integral,PCI)电压调节器,通过深入分析和对比比例积分(proportional integral,PI)、比例谐振(proportional resonant,PR)和PCI调节器的本身及闭环特性,论证PCI电压调节器对负序电压的优良控制性能。构建100 k VA-VSG仿真平台和实验系统,对所提理论的可行性进行实验验证。Based on the mechanism of three-phase micro-source converter output voltage unbalance under unbalancedload conditions,the mathematical model of virtual synchronous generator（VSG）is established with the control targetbeing symmetrical three-phase voltage. The modulation strategy with positive and negative sequence values beingcontrolled in synchronous rotating frame（SRF）is proposed and the VSG negative sequence voltage instructions are given.The proportional complex integral（PCI）voltage regulator is introduced to regulate the negative sequence voltage in theSRF,and its excellent voltage tracking ability is well proved by analyzing and comparing the amplitude frequency andphase frequency characteristics with PI and PR voltage regulators. The VSG unbalance voltage control strategy is wellvalidated by the simulation and experimental results based on a 100 k VA-VSG platform.

关 键 词：不平衡负载 虚拟同步发电机 比例复数积分调节器 比例积分调节器 比例谐振调节器 

分 类 号：TK514[动力工程及工程热物理—热能工程]