基于直流输电无功控制的多直流馈出电网交流系统过电压最优抑制策略

发布时间：2018-02-23 13:02

本文关键词： 直流输电系统无功控制关断角过电压最优控制　出处：《电网技术》2017年12期 　论文类型：期刊论文

【摘要】：为解决多直流集中外送电网在单回直流故障期间交流电网出现的过电压问题,提出了一种基于高压直流输电无功控制的过电压最优抑制策略。对直流输电系统外送功率受阻时交流系统过电压的机理进行了研究。研究表明,在直流输电系统换相失败或线路故障重启期间,换流器消耗无功明显减少,在交流侧滤波器切除之前,交流系统无功严重过剩,导致换流站交流母线出现较为明显的电压抬升,甚至出现过电压。基于该机理提出了过电压抑制策略,该策略在单回直流故障期间,短时提升近区健全直流逆变侧关断角γ及直流电流指令,在保持健全直流外送功率不变的基础上,增加整流侧换流器的无功消耗,从而抑制过电压的策略。基于最优控制器的设计方法,给出了过电压抑制环节的设计过程及实施方法。中国西南某双直流馈出电网实际仿真算例验证了该抑制环节的有效性。
[Abstract]:In order to solve the overvoltage problem of multi-DC centralized outgoing power network during single DC fault, In this paper, an optimal overvoltage suppression strategy based on HVDC reactive power control is proposed. The mechanism of overvoltage in AC system is studied when the output power of HVDC transmission system is blocked. During the commutation failure or line fault restart, the commutator consumes significantly less reactive power. Before the AC side filter is removed, the AC system has a serious excess of reactive power, which leads to the obvious voltage uplift of the AC bus at the converter station. Based on this mechanism, an overvoltage suppression strategy is proposed, in which the turn-off angle 纬 and the DC current command of a sound DC inverter side in a short period of time are raised during a single DC fault. Based on the design method of optimal controller, the reactive power consumption of rectifier side converter is increased and the overvoltage is restrained on the basis of maintaining a sound DC output power constant. The design process and implementation method of the overvoltage suppression link are given. The effectiveness of the suppression link is verified by a practical simulation example of a double-DC feedout network in southwest China.
【作者单位】：国网四川省电力公司电力科学研究院;电网安全与节能国家重点实验室(中国电力科学研究院有限公司);
【基金】：四川省科技厅重点研发计划(2017GZ0054) 中国博士后科学基金资助项目(2015M582543)~~
【分类号】：TM721.1

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