基于N-1规则的多端柔性直流输电系统联合控制策略

发布时间：2018-02-03 22:22

本文关键词： 多端柔性直流输电 N- 直流电压联合控制　出处：《电力建设》2017年11期 　论文类型：期刊论文

【摘要】：在多端柔性直流(voltage source converter based multi-terminal DC,VSC-MTDC)输电系统安全运行时,该系统必须满足N-1法则,即当该系统任何一个换流站由于故障或者检修退出运行时,剩余系统具备功率调节能力,能够恢复功率平衡,保持系统稳定运行,且暂态过电压不会超过设备绝缘裕度。为了维持VSC-MTDC直流电压尽可能地稳定在原有水平,提出了一种考虑到VSC-MTDC中任一换流站退出运行时的联合控制策略。该策略结合了VSC-MTDC系统主从控制与下垂控制的优点,令VSC-MTDC系统中容量最大的换流站为定直流电压控制,其余换流站为直流电压-有功功率下垂控制,并设置定直流电压控制换流站参与功率调节的优先级高于其余换流站,仅当定直流电压控制换流站传输功率达到上限时其余换流站才参与功率的调节。最后,在PSCAD/EMTDC中搭建了VSC-MTDC的仿真模型,对所提出的联合控制策略在N-1故障条件下进行仿真验证。仿真结果表明:所提联合控制策略在换流站退出运行时有效保证了直流电压的稳定以及系统功率的紧急输送,提高了VSC-MTDC的运行稳定性。
[Abstract]:Voltage source converter based multi-terminal DC. When the VSC-MTDC transmission system runs safely, the system must meet the N-1 rule, that is, when any converter station of the system is out of operation due to failure or maintenance. The residual system has the ability of power regulation, which can restore the power balance and keep the system running stably. And the transient overvoltage will not exceed the insulation margin of the equipment. In order to maintain the VSC-MTDC DC voltage as stable as possible at the original level. A joint control strategy considering the exit of any converter station in VSC-MTDC is proposed, which combines the advantages of master-slave control and droop control in VSC-MTDC system. The converter station with the largest capacity in VSC-MTDC system is controlled by constant DC voltage, while the other converter stations are controlled by DC voltage-active power droop. And set the constant DC voltage control converter station to participate in the power regulation priority is higher than the other converter stations, only when the constant DC voltage control converter station transmission power reaches the upper limit to participate in the power regulation. Finally. The simulation model of VSC-MTDC is built in PSCAD/EMTDC. The proposed joint control strategy is simulated under the condition of N-1 fault. The simulation results show that:. The proposed joint control strategy can effectively ensure the stability of DC voltage and the emergency transmission of system power when the converter station is out of operation. The stability of VSC-MTDC is improved.
【作者单位】：南方电网科学研究院有限责任公司直流输电技术国家重点实验室;华北电力大学电气与电子工程学院;
【基金】：南方电网重点科技项目(CSGTRC-K153030)
【分类号】：TM721.1
【正文快照】： 0引言随着我国在风电、光伏等可再生能源方面的投入逐年增长,实现新能源并网和远距离输电的要求十分迫切[1]。多端柔性直流(voltage sourced converterbased on the multi-terminal high voltage direct current,VSC-MTDC)输电技术能够将多个分散的小容量可再生能源发电厂接入

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