| 引用本文: | 王振浩,田奇,成龙,李国庆.混合式高压直流断路器暂态分断特性及其参数影响分析[J].电力系统保护与控制,2019,47(18):1-10.[点击复制] |
| WANG Zhenhao,TIAN Qi,CHENG Long,LI Guoqing.Transient breaking characteristics and its parameter influence analysis of hybrid DC circuit breaker[J].Power System Protection and Control,2019,47(18):1-10[点击复制] |
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| 摘要: |
| 混合式高压直流断路器(DC Circuit Breaker, DCCB)的本质是分断故障电流。分断暂态过程中的电气参数是决定断路器分断性能的核心所在。在分析DCCB拓扑结构的基础上，将断路器分断暂态过程划分为三个阶段。通过建立带DCCB的直流电网故障等效电路和断路器分断各暂态阶段的系统级等效电路，来分析分断过程中断路器自身的暂态特性。将断路器自身参数与直流系统参数联合起来，分别对断路器的两次换流过程进行详细分析。建立了断路器分断电流、暂态电压和开断时间的数学模型，推导断路器分断全过程中的分断电流以及最大暂态电压的计算表达式，并分析了断路器参数对分断性能的影响情况。利用PSCAD/EMTDC软件，搭建系统级混合式DCCB仿真模型，验证了所建立的断路器暂态模型的正确性及参数选取对断路器开断性能的影响。 |
| 关键词: 直流电网 混合式高压直流断路器 分断暂态特性 影响因素 |
| DOI：10.19783/j.cnki.pspc.181229 |
| 投稿时间：2018-09-29修订日期：2018-12-09 |
| 基金项目:国家重点研发计划项目资助(2017YFB0902401);吉林省科技厅项目资助(20160307014GX) |
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| Transient breaking characteristics and its parameter influence analysis of hybrid DC circuit breaker |
| WANG Zhenhao,TIAN Qi,CHENG Long,LI Guoqing |
| (School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China) |
| Abstract: |
| The essence of DC circuit breaker (DCCB) is to break the fault current. The electrical parameters in transient breaking process are the core expression which determines the breaking characteristics of circuit breaker. In this paper, based on the analysis of DCCB topology, the transient process of breakers is divided into three stages. The transient characteristics of the circuit breakers in the breaking process are analyzed by establishing the fault equivalent circuit for the DC grid with DCCB and the system level equivalent circuit for breaker at different breaking transient states. Combining the parameters of the circuit breaker with the parameters of the DC system, the two flow process of the circuit breaker is analyzed in detail. The mathematical model of breaking current, transient voltage and breaking time is established, and the calculation expression of the breaking current and the maximum transient voltage in the whole process of breaking the circuit breaker is derived. The influence of circuit breaker parameters on breaking performance is analyzed. By using PSCAD/EMTDC, a system level hybrid DCCB simulation model is built to verify the transient model of circuit breaker and the influence of parameters selection on the interruption performance of the circuit breaker. This work is supported by National Key Research and Development Program of China (No. 2017YFB0902401) and Science and Technology Department of Jilin Province (No. 20160307014GX). |
| Key words: DC grid hybrid DC circuit breaker (DCCB) transient breaking characteristics influence factors |
