微网中电流源型变流器并离网研究  

Research on Grid-connected and Islanded Mode of Current Source Converter in Micro-grid System

作　　者：姬志辉[1] 金新民[1] 白建成[1] 王京保[1] 

机构地区：[1]北京交通大学,电气工程学院,北京100044

出　　处：《电力电子技术》2013年第4期67-69,共3页Power Electronics

摘　　要：基于微网储能实验系统,研究了一种变流器在并网和离网状态下对重要负载不间断供电的方法。系统以蓄电池为储能装置,通过变流器接入电网。并网运行时,变流器采用电流源控制模式。当快速电网断电检测装置检测到电网断电时,保留断电前的旋转矢量转为孤岛运行,同时变流器变为电压源运行模式。离网转并网时,自动跟随电网电压矢量,并检测主开关两端电压差来保证无缝切换。最后,用Matlab仿真模型验证了并离网切换的正确性,并选用50 kW储能变流器进行实验,结果证明了该方法的正确性和有效性。This article based on energy storage system of micro-grid studys a method which supplies uninterruptible power to critical loads under grid-connected or islanded mode.Storage battery connected to the grid through the converter works as energy storage device.The converter operates in current source control mode under grid-connected condition.When power failure is detected by using fast grid power failure detection device, retains the rotation vector the right moment before power failure and changes into islanded mode.At the same time the converter changes oper- ation mode into voltage source control.And it is necessary to automatically follow the grid voltage vector and detect the voltage difference across the main switch to ensure seamless switching from the islanded mode to the grid-con- nected mode.Finally, the transfer between two modes is verified correct in the simulation model of Matlab.And the ex- perimental results of a 50 kW storage converter also prove the correctness and validity of the method used.

关 键 词：变流器 电流源 并离网 无缝切换 

分 类 号：TM46[电气工程—电器]