Dynamic Performance of a Modular Multilevel Back-to-Back HVDC System
Dynamic Performance of a Modular Multilevel Back-to-Back HVDC System
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DOI：
10.1109/tpwrd.2010.2050787
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发表时间：
2010-10-01
影响因子：
4.4
通讯作者：
Iravani, Reza
中科院分区：
文献类型：
--
作者：
Saeedifard, Maryam;Iravani, Reza
模块化多电平换流器（MMC）是一种新型的开关模式换流器拓扑结构，具有应用于高压直流输电的潜力。本文主要研究基于MMC的背靠背HVDC系统的动态性能。本文提出了一种用于MMC的相位配置（PD）正弦脉宽调制（SPWM）策略，包括电压平衡方法。基于所提出的PD-SPWM开关策略，建立了MMC-HVDC系统在电网平衡和不平衡运行模式下的数学模型。基于PSCAD/EMTDC环境下的时域仿真研究，基于MMC的背靠背HVDC换流器系统的动态性能进行评估。时域仿真结果表明，基于所采用的PD-SPWM开关策略，MMC-HVDC站在平衡和不平衡条件下均能对系统动态和控制指令做出满意的响应，同时保持直流电容器电压平衡。
The modular multilevel converter (MMC) is a newly introduced switch-mode converter topology with the potential for high-voltage direct current (HVDC) transmission applications. This paper focuses on the dynamic performance of an MMC-based, back-to-back HVDC system. A phase-disposition (PD) sinusoidal pulsewidth modulation (SPWM) strategy, including a voltage balancing method, for the operation of an MMC is presented in this paper. Based on the proposed PD-SPWM switching strategy, a mathematical model for the MMC-HVDC system, under both balanced and unbalanced grid operation modes, is developed. Dynamic performance of the MMC-based back-to-back HVDC converter system, based on time-domain simulation studies in the PSCAD/EMTDC environment, is then evaluated. The reported time-domain simulation results show that based on the adopted PD-SPWM switching strategy, the MMC-HVDC station can respond satisfactorily to the system dynamics and control commands under balanced and unbalanced conditions while maintaining voltage balance of the dc capacitors.