直流逆变站电压稳定测度指标及紧急控制

发布时间：2018-02-26 15:07

本文关键词： 特高压直流逆变站动态无功特性电压稳定无功平衡戴维南等值稳定测度指标直流电流控制　出处：《中国电机工程学报》2015年02期 　论文类型：期刊论文

【摘要】：特高压直流逆变器在大功率传输有功功率的同时,需要由大容量容性滤波器和电容器组补偿其无功消耗。以逆变器和补偿器为主要部件的直流逆变站,其综合动态无功特性会对受端交流系统电压稳定性产生显著影响。该文分析了交流电压大幅波动过程中,逆变站综合动态无功需求特性,以及交流戴维南等值系统无功供给能力特性;揭示逆变站因电压降低无功需求增大,以及交流系统因联系电抗增加无功供给能力降低,导致无功供需失衡,是直流威胁受端系统电压稳定的根本原因。提出基于交流戴维南等值参数的逆变站动态电压稳定测度指标,定量评估直流逆变站馈入受端系统的电压稳定裕度;基于该指标,提出改善受端系统电压稳定性的直流电流控制策略。仿真结果验证了稳定测度指标及电流控制策略的有效性。
[Abstract]:UHV DC inverter needs to compensate its reactive power consumption by large capacity capacitive filter and capacitor bank while transmitting active power at the same time. The inverter and compensator are the main components of DC inverter station. The integrated dynamic reactive power characteristics will have a significant impact on the voltage stability of the AC system at the receiving end. This paper analyzes the comprehensive dynamic reactive power demand characteristics of the inverter station during the large fluctuation of the AC voltage. And the characteristics of reactive power supply capacity of AC Davinan equivalent system, it is revealed that the reactive power demand of inverter station increases due to voltage reduction, and the reactive power supply capacity of AC system decreases due to the increase of reactance, which leads to the imbalance of reactive power supply and demand. This paper presents a dynamic voltage stability measurement index based on AC Davinan equivalent parameters to quantitatively evaluate the voltage stability margin of DC inverter station feed into the receiver system, based on which the voltage stability margin of DC inverter station fed into the receiver system is quantitatively evaluated. A DC current control strategy is proposed to improve the voltage stability of the receiver system. The simulation results verify the effectiveness of the stability measure index and the current control strategy.
【作者单位】：中国电力科学研究院;
【基金】：国家电网公司大电网重大专项资助项目(SGCC-MPLG001-2012)~~
【分类号】：TM712

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