高压直流输电系统低功率运行的无功控制策略

发布时间：2018-01-13 10:30

本文关键词：高压直流输电系统低功率运行的无功控制策略　出处：《电力系统自动化》2017年06期 　论文类型：期刊论文

【摘要】：当高压直流输电系统低功率运行时,受换流站接入点谐波性能和交流滤波器设备性能限制,投入的交流滤波器提供的无功功率在满足站内无功消耗外可能仍有大量剩余,导致大量剩余无功送入交流系统,使得换流站及附近厂站的电压容易偏高,继而影响到电网的安全稳定运行。文中提出一种充分利用换流器自身无功调节能力的换流站无功控制策略,该策略在有功输送不受影响的前提下,以直流电压为控制量,以换流站无功交换量为反馈量,通过改变直流电压参考值来对换流器的无功消耗进行定量控制,可有效抑制换流站过剩无功对交流系统电压的影响。该无功控制策略解决了现有直流工程中低功率无功优化功能由于开环控制无法对无功功率进行精确控制的问题。PSCAD/EMTDC和实时数字仿真器(RTDS)中的仿真结果验证了该方法的正确性和鲁棒性。
[Abstract]:When the HVDC system runs at low power, it is limited by the harmonic performance of the switching station access point and the performance of AC filter equipment. The reactive power provided by the input AC filter may still have a large amount of surplus in order to satisfy the reactive power consumption in the station, which leads to a large amount of residual reactive power being fed into the AC system, which makes the voltage of converter station and nearby factory station easy to be higher. Then it affects the safe and stable operation of the power network. This paper presents a reactive power control strategy of converter station which makes full use of the reactive power regulation capacity of the converter. The strategy is not affected under the premise of active power transmission. Taking DC voltage as control quantity and reactive power exchange quantity of converter station as feedback quantity, the reactive power consumption of converter is controlled quantitatively by changing the reference value of DC voltage. The reactive power control strategy solves the problem that low power reactive power optimization function in current DC engineering can not be accurately controlled due to open-loop control. PSCAD / EMTDC and Real-Time Digital Simulator (. The simulation results in RTDS verify the correctness and robustness of the method.
【作者单位】：华南理工大学电力学院;南方电网科学研究院;
【基金】：国家自然科学基金青年基金资助项目(51207057)~~
【分类号】：TM721.1;TM714.3
【正文快照】： 0引言直流换流站在输送有功功率时需消耗大量的无功功率,无功功率不足或过剩都会导致交流电压的波动,严重时会影响整个系统的安全稳定性。受谐波性能和交流滤波器设备性能限制,高压直流输电系统运行时交流侧必须投入一定组数的交流滤波器[1-4]。同时,受滤波器组的体积和造价等

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