电网电压不平衡时MMC-HVDC的无差拍直接功率控制

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摘要针对电网电压不平衡时,模块化多电平换流器高压直流输电系统(MMC-HVDC)的传统控制策略结构复杂、需要旋转坐标变换和锁相环以及需要调整的PI参数较多、动态响应慢等问题,基于MMC-HVDC通用功率模型,提出一种电网电压不平衡时的无差拍直接功率控制策略,该策略省略了电流内环,因而无需复杂的参考电流计算,避免了使用多个PI调节器和多个PI参数难以整定的困难,可实现对有功和无功的直接控制,响应速度快。为了实现电网电压不平衡时抑制负序电流、抑制有功波动和抑制无功波动3个控制目标,提出功率补偿策略,并分别给出3个控制目标所对应功率补偿分量的计算公式。在PSCAD/EMTDC中搭建11电平MMC-HVDC仿真模型,验证了所提控制策略的可靠性和有效性。

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	梁营玉
	杨奇逊
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关键词 ：电网电压不平衡, 直接功率控制, 无差拍, 功率补偿策略

Abstract：Traditional control strategies of high voltage direct current transmission based on modular multilevel converter (MMC-HVDC) have many shortcomings such as complicated control structures,the requirement of multiple PI regulators,rotating coordinate transformation and phase locked loop,and slow dynamic response under unbalanced grid voltage,etc.On the basis of the generalized power model of MMC-HVDC,the deadbeat direct power control method under unbalanced grid voltages is presented,which omits current inner loop so that the complicated reference current computation and multiple PI regulators and the tuning of their corresponding multiple parameters are avoided.This method can regulate active power and reactive power directly and has a fast dynamic response.The power compensation strategy is proposed to achieve three selective control objectives under unbalanced grid voltages,i.e.negative sequence current suppression,active power fluctuation suppression,and reactive power fluctuation suppression,respectively.The computation formulas of the power compensation components for three control objectives are given in this paper.The simulation platform of MMC-HVDC with 11 levels is built in PSCAD/EMTDC,and the simulation results verify the correctness and the effectiveness of the proposed method.

Key words： Unbalanced grid voltages direct power control deadbeat power compensation strategy

收稿日期: 2014-12-18 出版日期: 2015-09-08

PACS:

TM721.1

通讯作者: 杨奇逊男,1937年生,教授,博士生导师,研究方向为电力系统自动化、微机继电保护、变电站综合自动化等。

作者简介: 梁营玉男,1989年生,博士研究生,研究方向为HVDC和柔性交流输配电技术。

引用本文:

梁营玉, 杨奇逊, 刘建政, 张涛,. 电网电压不平衡时MMC-HVDC的无差拍直接功率控制[J]. 电工技术学报, 2015, 30(15): 15-25. Liang Yingyu,Yang Qixun,Liu Jianzheng,Zhang Tao. Deadbeat Direct Power Control for MMC-HVDC Under Unbalanced Grid Voltages. Transactions of China Electrotechnical Society, 2015, 30(15): 15-25.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I15/15

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