摘要
模块化多电平换流器(MMC)技术凭借其在新能源并网、孤岛供电、非同步电网互联、多端直流输电以及城市配电网增容等领域中的独特优势而被电力系统采纳和应用。其大功率、高电压、强电流的特点,导致很难构建与实际工程相同的全载电路进行试验。因此,设计适当、有效的试验方法和装置来获得能够代表实际运行条件的关键应力显得尤为重要。介绍一种MMC功率模块对推的试验拓扑,提出一种脉宽调制(PWM)斩波和定电流控制策略对试验电路进行控制,通过Matlab仿真和试验验证了所述控制策略可防止IGBT动作频繁和控制系统的延时导致IGBT过流;同时解决了固定脉冲充电速度较慢的问题。该试验拓扑简洁明了,能近似模拟MMC功率模块实际运行中的电压、电流和温度应力,特别适合模块样机研制阶段对单模块进行测试。
Modular multilevel converter(MMC) technology is widely used in power system, such as in new energy grid, isolated power supply, the synchronization of the interconnection, muhi-terminal voltage direct current transmission and urban distribution network.It's difficult to build the actual circuit to test the MMC in a test environment because of the high power, high voltage and high current.A topology to test the power module of MMC is described, and a chop- per pulse width modulation (PWM) and constant current control strategy is proposed.The effectiveness of the control stra- tegy is verified by Matlab simulation and experimental results.The control strategy and topology which can approximate the actual voltage, current and temperature stress of the MMC module is particularly suitable for single-module test.
出处
《电力电子技术》
CSCD
北大核心
2017年第6期52-53,60,共3页
Power Electronics
基金
国家高技术研究发展计划(863计划)(2015AA050102)
国家电网公司科技项目(5210EF150010)~~
关键词
换流器
运行试验
控制策略
converter
running test
control strategy