模块化多电平换流器主回路参数设计

发布时间：2018-03-16 13:20

  本文选题：模块化多电平换流器　切入点：主回路参数　出处：《高电压技术》2015年08期 　论文类型：期刊论文

【摘要】：模块化多电平换流器(MMC)将在电力系统中得到越来越广泛的应用,其主回路参数的设计直接影响系统的投资和运行性能。因此研究了MMC主回路中几种重要元件的参数设计问题,包括连接变压器、桥臂电抗器、子模块电容器、IGBT模块等。基于MMC的基本等值电路,提出了连接变压器阀侧空载额定电压的确定方法,论证了阀侧空载额定线电压的取值范围为直流侧电压的(1.00~1.05)/2倍;引入等容量放电时间常数的概念,发现电容电压波动率与等容量放电时间常数之间的关系基本不随具体工程而变,即具有跨工程的普遍适用性,因而可以一般性地给出子模块的电容参数,还分析了以往工程的对应参数,给出了等容量放电时间常数为40 ms的推荐值;基于MMC的解析数学模型考察了4种极端工况下子模块功率器件所承受的电压和电流水平,发现子模块功率器件的负载水平会随运行工况的改变而发生巨大变化;引入二倍频环流谐振角频率和相单元串联谐振角频率的概念,提出了桥臂电抗器参数的取值原则,并分析了以往工程的对应参数,给出了桥臂电抗器参数普遍适用的推荐值为相单元串联谐振角频率取电网工频角频率。
[Abstract]:The modular multilevel converter (MMC) will be more and more widely used in the power system. The design of the main circuit parameters directly affects the investment and operation performance of the system. Therefore, the parameter design of several important components in the main circuit of MMC is studied. Based on the basic equivalent circuit of MMC, the method of determining the no-load rated voltage on the valve side of the connecting transformer is presented, including the connection transformer, the bridge arm reactor, the sub-module capacitor and so on. It is proved that the range of rated line voltage on the valve side is 1.000.05 / 2 of DC side voltage, and the concept of equal capacity discharge time constant is introduced. It is found that the relationship between capacitance voltage fluctuation rate and equal capacity discharge time constant basically does not change with specific projects. Because of the universal applicability of cross-engineering, the capacitance parameters of sub-modules can be given generally, and the corresponding parameters of previous projects are analyzed, and the recommended value of equal capacity discharge time constant of 40ms is given. Based on the analytical mathematical model of MMC, the voltage and current levels of four sub-module power devices under extreme working conditions are investigated. It is found that the load level of sub-module power devices will change greatly with the change of operating conditions. The concept of resonant angular frequency of second harmonic circulation and series resonant angular frequency of phase unit is introduced. The principle of selecting the parameters of bridge arm reactor is put forward, and the corresponding parameters of previous projects are analyzed. It is shown that the recommended value for the parameters of the bridge arm reactor is the series resonant angular frequency of the phase unit and the power frequency angle frequency of the power network.
【作者单位】： 浙江大学电气工程学院;
【基金】：国家电网公司科技项目(SGCC-HRP031-2015)~~
【分类号】：TM721.1
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本文编号：1620093