基于双逆变组合的电网特性模拟电源研究  

Study of Grid Simulator Based on Topology Combined by Two Inverters

作　　者：李官军[1] 庄俊[1] 余豪杰[1] 周晨[1] 

机构地区：[1]中国电力科学研究院新能源与储能运行控制国家重点实验室,北京100192

出　　处：《电力电子技术》2017年第10期105-108,共4页Power Electronics

基　　金：国家电网科技项目(NY71-16-045)~~

摘　　要：现有大功率电网模拟器开关频率较低且滤波器截止频率带宽较小,使其谐波模拟常常失真,无法准确模拟电网阻抗,因此,无法为弱电网条件下并网逆变器的适应能力考核提供测试平台。采用一种主逆变单元和辅助逆变单元的双逆变组合电网模拟器拓扑,主逆变单元只需承担电网基波及其故障特性的模拟,辅助逆变单元仅模拟电网谐波和电网阻抗特性。各逆变单元的控制器设计相互独立,控制精度高。实验结果表明,所设计的电网特性模拟电源可灵活地模拟电网跌落故障,准确地模拟电网谐波和阻抗特性。The harmonics simulation of present high-power grid simulator often distorts due to low switching frequency and small cut-off frequency bandwidth of the filter,making it unable to accurately simulate grid impedance.Conse- quently,the simulator cannot be used as a test platform for grid-connected inverter＇s adaptive capacity assessment under weak power grid condition.A two-inverter grid simulator topology is adopt ,which is a novel topology combined iby a main inverter unit and an auxiliary inverter unit.The main inverter unit only simulates the grid＇s fundamental wave and its fault characteristics, while the auxiliary inverter unit only simulates the harmonics and impedance char- acteristics of grid.The controller of each inverter unit is designed separately, leading to high control accuracy.The ex- perimental results verify that the designed grid characteristics simulation supply can flexibly simulate the grid drop faults and accurately simulate harmonics and impedance characteristics of grid.

关 键 词：模拟电源 电网特性 谐波控制 阻抗模拟 

分 类 号：TN86[电子电信—信息与通信工程]