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不对称双极多端柔性直流电网短路电流特性分析
Characteristic Analysis on Short-circuit Current for Asymmetric Bipolar Modular Multilevel Converter Based Multi-terminal Direct Current Grid
- 电力系统自动化-方正平台 2020年44卷第12期 页码：101-107
- 作者机构：
1. 临沂大学自动化与电气工程学院，山东省 临沂市 276000
2. 清华大学电机工程与应用电子技术系，北京市 100084
3. 山东大学电气工程学院，山东省 济南市 250061
- 作者简介：
何莉萍(1982—)，女，讲师，主要研究方向：电力系统运行与控制、电力电子技术在电力系统中的应用。E-mail：lp-h@163.com
高仕林(1994—)，男，通信作者，博士研究生，主要研究方向：电力系统稳定性分析与控制、柔性直流输电。E-mail：gaosl19@mails.tsinghua.edu.cn
叶华(1981—)，男，教授，博士生导师，主要研究方向：电力系统稳定性分析与控制、信息物理融合电力系统和柔性直流输电。E-mail：yehua@email.sdu.edu.cn
- 基金信息：国家重点研发计划资助项目(2016YFB0900500)
DOI：10.7500/AEPS20190729014
中图分类号：收稿日期：2019-07-29，
修回日期：2020-02-21，
网络出版日期：2020-04-24，
纸质出版日期：2020-06-25
- 稿件说明：
移动端阅览
何莉萍,高仕林,叶华.不对称双极多端柔性直流电网短路电流特性分析[J].电力系统自动化,2020,44(12):101-107.
HE Liping,GAO Shilin,YE Hua.Characteristic Analysis on Short-circuit Current for Asymmetric Bipolar Modular Multilevel Converter Based Multi-terminal Direct Current Grid[J].Automation of Electric Power Systems,2020,44(12):101-107.
何莉萍,高仕林,叶华.不对称双极多端柔性直流电网短路电流特性分析[J].电力系统自动化,2020,44(12):101-107. DOI： 10.7500/AEPS20190729014.
HE Liping,GAO Shilin,YE Hua.Characteristic Analysis on Short-circuit Current for Asymmetric Bipolar Modular Multilevel Converter Based Multi-terminal Direct Current Grid[J].Automation of Electric Power Systems,2020,44(12):101-107. DOI： 10.7500/AEPS20190729014.
摘要
含金属回线的不对称双极柔性直流电网的短路电流特性分析是其故障类型判别和故障隔离的基础。不对称双极电网发生各种故障时的短路电流具有相似的特性，难以区分。文中针对不对称双极多端直流电网的短路电流特性进行分析。首先，建立直流电网的等效电路，其中换流器和线路分别简化为RLC串联电路和RL串联电路；然后，基于建立的等效电路，分析了单端换流站的短路电流特性；最后，基于单端换流站短路电流特性，分析各换流站的放电回路，研究了不对称双极多端柔性直流电网在各种故障类型下的短路电流特性。中国张北双极柔性直流电网的仿真结果验证了分析得到的多端柔性直流电网短路电流特性的正确性。
Abstract
Characteristic analysis on short-circuit current for asymmetric bipolar modular multilevel converter (MMC) based multi-terminal direct current (MMC-MTDC) grid with dedicated metallic return (DMR) is the foundation of its fault type discrimination and fault isolation. The characteristics of short-circuit currents with different faults are similar
which are difficult to distinguish. This paper analyzes the short-circuit current characteristics of asymmetric bipolar MTDC grids. Firstly
the equivalent circuit of the MTDC grid is established
where the converter and overhead line are simplified to RLC series circuit and RL series circuit
respectively. Then
based on this
the short-circuit current characteristics of a single-terminal converter station are analyzed. Finally
based on the short-circuit current characteristics of a single-terminal converter station
the short-circuit current characteristics of the asymmetric bipolar MMC-MTDC grid with various faults are studied by analyzing the discharging circuit of MMCs. Simulation results on the Zhangbei bipolar MMC-MTDC grid of China validate the correctness of the characteristic analysis on short-circuit current for MMC-MTDC grids.
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references
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