电工技术学报  2023, Vol. 38 Issue (zk1): 187-195    DOI: 10.19595/j.cnki.1000-6753.tces.L10058
高电压与放电 |
基于电弧模型的直流开关振荡回路参数研究
于雷1, 李劲彬2, 袁佳歆3, 王伊帆3, 蒋紫薇3, 李佳伟1
1.国网湖北省电力有限公司直流公司 宜昌 443000;
2.国网湖北省电力有限公司电力科学研究院 武汉 430077;
3.武汉大学电气与自动化学院 武汉 430072
Research on Parameters of DC Switch Oscillation Circuit Based on Arc Model
Yu Lei1, Li Jinbin2, Yuan Jiaxin3, Wang Yifan3, Jiang Ziwei3, Li Jiawei1
1. State Grid Hubei Direct Current Company Yichang 443000 China;
2. State Grid Hubei Electric Power Research Institute Wuhan 430077 China;
3. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China
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摘要 振荡回路在直流开关开断过程中通过提供振荡电流来创造“过零点”,振荡过程对成功开断与否具有决定性作用,因此亟须研究振荡回路参数对开断的影响。现有研究尚未在结合开断回路电弧特性的基础上考虑振荡回路寄生参数,存在参数不匹配、准确性低等局限性。该文首先根据实际工程参数,建立了含寄生参数的等效多电容组合的振荡回路改进模型。然后,基于Simulink仿真平台对振荡回路改进模型开展仿真研究;同时开展了振荡回路本体特性实验,验证了仿真的正确性。最后,在考虑电弧特征的基础上,深入研究振荡回路参数对开断过程的影响机理,得出了RLC参数与开断特性间的映射关系。
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于雷
李劲彬
袁佳歆
王伊帆
蒋紫薇
李佳伟
关键词 电弧模型直流开关振荡回路电容    
Abstract:The DC transfer switch is an essential piece of equipment in ultra-high voltage DC transmission projects. It is mainly used to increase the flexibility of transmission operations and to protect and remove faults. The DC transfer switch is composed of three parts: the breaking circuit, energy absorption circuit, and oscillation circuit. The oscillation circuit creates a “zero-crossing point” by providing oscillation current during the DC switch breaking process. The oscillation process plays a decisive role in the successful breaking or not. Therefore, it is urgent to study the influence of oscillation circuit parameters on the breaking. The parameters of capacitors in the oscillation circuit are affected by manufacturing, transportation, use, and other processes, which may result in initial type faults, occasional faults, overload operation faults, and aging operation faults. A fault can cause a change in the capacitance value, which may cause the DC switch to fail to open. The existing research has not yet considered the parasitic parameters of the oscillation circuit based on the arc characteristics of the breaking circuit, which has limitations such as parameter mismatch and low accuracy. Moreover, there is limited research on various arc models applicable to DC conversion switches.
This article first analyzes in detail the principles and characteristics of various arc models. Then, based on the parameters of a certain ultra-high voltage DC transmission system, an improved model with equivalent multi-capacitor combination and parasitic parameters is constructed to improve the accuracy of the oscillating circuit model. Next, simulation research on the improved oscillating circuit model is carried out based on the Simulink simulation platform, and the characteristics of the oscillating circuit itself are also experimentally studied on site. The theoretical calculation results, simulation results and experimental results are compared and analyzed to verify the correctness of the model. Subsequently, the equivalent arc model of the breaking circuit is theoretically studied, and the working results of the DC switch under different arc models are compared by simulation. Finally, in order to simulate possible situations on site, the influence mechanism of oscillating circuit parameters on the breaking process is further studied in depth under normal and fault conditions. and the following conclusions were drawn:
(1) The error between theoretical calculation values, transient simulation results, and oscillation characteristics experimental results is relatively small, which verifies the effectiveness of the improved model of equivalent multi capacitor combination with parasitic parameters.
(2) The modeling of DC switches cannot ignore the arc model, and the application of the Mayr arc model can accurately and efficiently simulate the changes in arc characteristics during the breaking process of DC switches.
(3) The parameters of the oscillation circuit have a significant impact on the breaking process, and excessive oscillation circuit resistance will prolong the arcing time, which is not conducive to breaking; Although some small capacitor faults can shorten the arcing time, they will accelerate the current change rate and increase the current amplitude several times. It is recommended to regularly inspect the oscillation circuit to ensure that the oscillation parameters are at a reasonable value.
Key wordsArc model    DC switch    oscillation circuit    capacitance   
收稿日期: 2023-01-13      出版日期: 2023-11-09
PACS: TM561.6  
基金资助:湖北省自然科学基金杰出青年基金(2020CFA098)和国家自然科学基金(52207182)资助项目
通讯作者: 王伊帆 女,2001年生,硕士研究生,研究方向为高压直流输电。E-mail:supingfang@whu.edu.cn   
作者简介: 于 雷 男,1976年生,高级工程师,研究方向为直流一次设备运检技术。E-mail:yul2@hb.sgcc.com.cn
引用本文:   
于雷, 李劲彬, 袁佳歆, 王伊帆, 蒋紫薇, 李佳伟. 基于电弧模型的直流开关振荡回路参数研究[J]. 电工技术学报, 2023, 38(zk1): 187-195. Yu Lei, Li Jinbin, Yuan Jiaxin, Wang Yifan, Jiang Ziwei, Li Jiawei. Research on Parameters of DC Switch Oscillation Circuit Based on Arc Model. Transactions of China Electrotechnical Society, 2023, 38(zk1): 187-195.
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