模块化多电平换流器子模块均压电阻参数优化策略

发布时间：2018-04-05 16:04

本文选题：模块化多电平换流器　切入点：子模块　出处：《电力自动化设备》2017年10期

【摘要】：子模块的均压电阻在模块化多电平换流器(MMC)启动过程中起均压作用,同时在停运过程中作为电容的放电电阻,但目前缺乏均压电阻参数设计的理论依据和优化策略。通过优化子模块仿真模型引入均压电阻和取能电源相关参数;分析了均压电阻参数在MMC启动过程中对子模块电容均压的影响,阐明了均压电阻过大时电容均压效果劣化的机理;同时修正了MMC停运后子模块电容放电时间的计算方法;最后提出满足电容均压、放电时间和功率要求的均压电阻参数优化策略和具体设计步骤。依托厦门柔性直流输电工程给出均压电阻参数设计实例并进行相关试验,试验结果验证了所提均压电阻参数优化策略的有效性。
[Abstract]:The voltage-sharing resistance of the sub-module plays a voltage-equalizing role in the starting process of the modularized multilevel converter MMC, and also acts as the discharge resistance of the capacitor during the shutdown process, but it lacks the theoretical basis and optimization strategy for the design of the voltage-sharing resistance parameters.Based on the simulation model of optimized sub-module, the parameters of voltage sharing resistance and power supply are introduced, the effect of voltage sharing resistance parameters on capacitor voltage equalization in MMC start-up is analyzed, and the deterioration mechanism of capacitance voltage equalization effect when voltage sharing resistance is too large is explained.At the same time, the calculation method of capacitance discharge time of submodule after MMC outage is revised, and the optimization strategy and design steps of voltage sharing resistance parameters are proposed to meet the requirements of capacitor voltage balance, discharge time and power.Based on Xiamen flexible direct current transmission project, an example of voltage sharing resistance parameter design is given and relevant experiments are carried out. The experimental results verify the effectiveness of the proposed optimization strategy.
【作者单位】：国网福建省电力有限公司电力科学研究院;
【基金】：国家电网公司科技项目(52130416001Z)~~
【分类号】：TM46

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