电工技术学报  2017, Vol. 32 Issue (10): 20-32    DOI:
多源多变换复杂交直流系统稳定控制与运行优化技术专题 |
基于子模块电压波动估计的MMC双环二倍频环流抑制策略
岳雨霏, 徐千鸣, 马伏军, 罗安, 何志兴
国家电能变换与控制工程技术研究中心(湖南大学) 长沙 410082
Dual-Loop 2nd Circulating Current Strategy Based on Estimated Capacitor Voltage Fluctuation of Sub-Module for Modular Multilevel Converter
Yue Yufei, Xu Qianming, Ma Fujun, Luo An, He Zhixing
National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha 410082 China
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摘要 模块化多电平变换器以其优越的性能在大功率电能变换领域得到了广泛应用和研究。推导了MMC子模块电容电压波动和桥臂投入模块数的表达式,针对MMC环流控制器性能分析的多样性、复杂性和电压波动的计算问题,提出一种基于子模块电容电压波动估计前馈+电压电流双闭环反馈的复合环流控制策略,有效结合前馈控制的快速跟踪性和反馈控制的闭环跟踪性能,同时优化计算环节。所提方法包括四部分:子模块电容电压的前馈估算;基于小信号模型的二倍频环流电压指令计算;投入模块数的计算;子模块电容电压的排序及其投切。其中二倍频环流电压指令通过电压电流双闭环控制器获得,并通过等效闭环阻抗分析其动态性能,选取达到最佳抑制效果时合适的控制参数。仿真和实验结果验证了所提方法的有效性。
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岳雨霏
徐千鸣
马伏军
罗安
何志兴
关键词 模块化多电平变换器 电容电压估计前馈 桥臂能量和差 双闭环反馈环流抑制 二倍频等效阻抗    
Abstract:With the attractive features, modular multilevel converters have been widely utilized and studied in large-capacitor power conversion field. This paper derived the expressions of capacitor voltage fluctuations from sub-module and the operating number of bridge arms. As for the fluctuation calculation of capacitor voltage as well as the complexity and diversity of performance analysis of MMC circulating current controllers, a composite circulating current control method was proposed. Herein, the feedforward control based on estimated voltage fluctuation, and the dual-closed-loop feedback control of voltage and current, were included. The proposed control method can effectively combine fast tracking performance of feedforward control with closed-loop tracking performance of feedback control. Accordingly, it can optimize the calculation. The method falls into four parts: estimated feedforward calculation of sub-module capacitor voltage; calculation of 2nd circulation voltage reference based small signal model; operating number calculation of sub-modules; sequence of sub-module capacitor voltage and operation of sub-modules. The 2nd circulation voltage reference was obtained through dual-closed-loop controller, while the dynamic performance of the dual-loop controller can be analyzed by equivalent closed-loop impedance. Then the appropriate control parameters can be selected with the best suppressing effect. Simulation and experimental results verify the validity of the proposed control method.
Key wordsModular multilevel converter (MMC)    feedforward of estimated capacitor voltage    summation and difference of bridge arm energy    dual-closed-loop feedback of circulating current suppression    2nd frequency equivalent impedance   
收稿日期: 2016-07-06      出版日期: 2017-05-26
PACS: TM46  
基金资助:国家自然科学基金面上项目(51477045)、国家自然科学基金项目(51507057)和湖南省研究生科研创新项目(CX2016B127)资助
通讯作者: 岳雨霏 女,1991年生,博士研究生,研究方向为电能质量控制与装备研制、大功率级联装置研制。E-mail: 14789868647@163.com   
作者简介: 徐千鸣 男,1989年生,博士研究生,研究方向为轻型直流输电与电能质量控制。E-mail: hnuxqm@foxmail.com
引用本文:   
岳雨霏, 徐千鸣, 马伏军, 罗安, 何志兴. 基于子模块电压波动估计的MMC双环二倍频环流抑制策略[J]. 电工技术学报, 2017, 32(10): 20-32. Yue Yufei, Xu Qianming, Ma Fujun, Luo An, He Zhixing. Dual-Loop 2nd Circulating Current Strategy Based on Estimated Capacitor Voltage Fluctuation of Sub-Module for Modular Multilevel Converter. Transactions of China Electrotechnical Society, 2017, 32(10): 20-32.
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