Direct Power Compensation Control Strategy for Modular Multilevel Converter Under Unbalanced Grid Voltage Conditions

SONG Pinggang; WU Jizhen; ZOU Huan

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Direct Power Compensation Control Strategy for Modular Multilevel Converter Under Unbalanced Grid Voltage Conditions

更新时间：2025-12-08

- Direct Power Compensation Control Strategy for Modular Multilevel Converter Under Unbalanced Grid Voltage Conditions
- Vol. 42, Issue 7, Pages: 2184-2192(2016)
- 作者机构：
  
  华东交通大学电气与电子工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 July 2016，
  
  Published：2016
- 稿件说明：
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SONG Pinggang, WU Jizhen, ZOU Huan. Direct Power Compensation Control Strategy for Modular Multilevel Converter Under Unbalanced Grid Voltage Conditions[J]. 2016, 42(7): 2184-2192.
DOI：

SONG Pinggang, WU Jizhen, ZOU Huan. Direct Power Compensation Control Strategy for Modular Multilevel Converter Under Unbalanced Grid Voltage Conditions[J]. 2016, 42(7): 2184-2192. DOI：

摘要

为了进一步提升电网电压不平衡时模块化多电平换流器型高压直流输电（MMC-HVDC）的电能传输质量

在αβ坐标系下提出一种无需交流电流正负序分离的MMC直接功率补偿策略

并对电网电压不平衡时MMC交流侧功率和瞬时功率进行了理论分析;针对MMC的零序环流将进入直流侧引起直流电压/电流2倍频波动的问题

基于比例谐振控制器设计了环流抑制控制器;最后在PSCAD中建立仿真模型验证所提出的控制策略和理论分析。仿真结果表明:在电网电压不平衡工况下

在消除负序电流和抑制有功功率波动2种控制目标下

MMC直流电压均可能出现2倍频波动

所设计的直接功率补偿控制系统可以分别有效地抑制网测负序电流或交流侧有功功率的2倍频波动

环流抑制控制器可以有效抑制直流侧2次波动。

Abstract

In order to enhance the quality of power transmission in modular multilevel converter for high voltage direct current transmission（MMC-HVDC） under the unbalanced grid voltage

we proposed a novel MMC direct power compensation strategy in the αβ coordinate system

which did not require the separation of positive and negative sequence currents. Moreover

we theoretically analyed MMC AC side power and instantaneous power in unbalanced power system voltage. The zero-sequence current of MMC would enter the DC side and then MMC DC voltage/current would fluctuate at double-line frequency.Then

we designed a circulating-current-suppressing controller-based quasi-proportional resonant controller. Finally

we established a simulation model to verify the proposed control strategy and theoretical analysis in PSCAD. The simulation results show that MMC DC voltage is likely to fluctuate at double-line frequency when the negative sequence current is eliminated or the active power fluctuation is suppressed under the unbalanced grid voltage conditions. The direct power compensation control system can effectively suppress the negative sequence current or AC side active power of the two harmonic waves

and the circulating current control can effectively suppress the two harmonic waves of the DC side.

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