基于自律分散控制的网孔型直流电网下垂系数计算方法

doi:10.19595/j.cnki.1000-6753.tces.191440

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摘要现有的对于直流电网的研究多集中于放射状直流电网拓扑的下垂系数计算,针对复杂直流电网的研究较少。该文提出一种基于自律分散控制的网孔型直流电网下垂系数计算方法。首先,由系统级控制采集和交换换流站信息,使各换流站获取相同的全局信息;其次,将全局信息代入最优潮流优化模型计算各换流站的有功功率和直流电压参考值;随后,定义虚拟节点并将直流电压参考值的平均值定义为虚拟电压值,取直流系统中直流电压等于虚拟电压值的点,将这些等势点合为虚拟节点从而简化网络拓扑;接着,分别计算最优潮流分布下和当前工况下各节点相对于虚拟节点的虚拟电阻和实际电阻值,此时,下垂系数等于两种电阻值差的倒数;最后,在PSCAD/EMTDC中搭建了六端直流电网。通过仿真,分析并验证了所提方法的可行性。

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关键词 ：直流电网, 自律分散控制, 虚拟节点, 下垂系数

Abstract：Recent researches focus on droop control coefficient calculation in the radial DC system, and fewer researches investigate its calculation in complex DC systems. This paper proposed a new method for droop control coefficient calculation in a meshed DC system based on automatically decentralized control. Firstly, the information of the converter was collected and interchanged by the system control layer of the automatically decentralized control. After that, all the converters obtained the same global information by the optimal power flow model to calculate the reference values of DC voltage and active power. Then, the virtual node was defined and its voltage was equal to the average of the reference DC voltage. The nodes where the voltage is equal to the virtual voltage were selected, and the system was simplified into radial topology. Subsequently, the reference resistances between nodes and the virtual node under the optimal condition could be obtained, the real resistances between nodes and the virtual node under current condition also could be calculated. Herein, the droop control coefficients are equal to the inverse of difference between the virtual and real resistances. Finally, a 6-terminal MMC-MTDC model was established in PSCAD/EMTDC, and the simulations verified the proposed method.

Key words： DC power system automatically decentralized control virtual node droop control coefficient

收稿日期: 2019-11-09

PACS:

TM76

基金资助:国家重点研发计划智能电网技术与装备重点专项（2016YFB0900600）和中央高校基本科研业务费专项资金（2018QN019）资助项目。

通讯作者: 曹昕男,1994年生,博士研究生,研究方向为电力电子在电力系统中的应用。 E-mail: caoxin_ncepu_16@163.com

作者简介: 韩民晓男,1961年生,教授,博士生导师,研究方向为电力电子在电力系统中的应用。E-mail: hanminxiao@263.net

引用本文:

曹昕, 韩民晓, 周光阳, 张利东. 基于自律分散控制的网孔型直流电网下垂系数计算方法[J]. 电工技术学报, 2020, 35(24): 5164-5174. Cao Xin, Han Minxiao, Zhou Guangyang, Zhang Lidong. A New Method to Obtain the Droop Control Coefficient in a Meshed DC System Based on Automatically Decentralized Control. Transactions of China Electrotechnical Society, 2020, 35(24): 5164-5174.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.191440 https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I24/5164

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