| 引用本文: | 朱红萍,李 毅,周振怿,朱泓知,钱万明.附加虚拟电容的动态非线性VDCOL控制器设计[J].电力系统保护与控制,2022,50(2):134-143.[点击复制] |
| ZHU Hongping,LI Yi,ZHOU Zhenyi,ZHU Hongzhi,QIAN Wanming.Design of a dynamic nonlinear VDCOL controller with additional virtual capacitance[J].Power System Protection and Control,2022,50(2):134-143[点击复制] |
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| 摘要: |
| 为有效抑制高压直流输电系统在不同故障程度下的连续换相失败，提出附加虚拟电容动态非线性低压限流低控制器(The Voltage Dependent Current Order Limiter, VDCOL)设计方案。首先，针对高压直流输电系统中常规VDCOL因直流电流指令调节不灵敏导致不能有效抑制重度故障程度下连续换相失败的问题，设计动态非线性VDCOL控制器，将常规VDCOL电压电流的线性关系设计成非线性，克服了指令电流不能灵活调节的缺点。同时考虑到换相失败发生前后电压可变，引入故障系数对电压进行了修改。其次，为提高动态非线性VDCOL控制器对轻度和中度故障的反应灵敏度，在动态非线性VDCOL的输入电压端设计附加虚拟电容模块，抑制故障发生时输入电压下跌。最后，通过PSCAD/EMTDC仿真对比分析，结果表明所提方案在不同故障程度下能有效抑制连续换相失败，缩短故障恢复时间。 |
| 关键词: 高压直流输电系统 连续换相失败 VDCOL 动态非线性 虚拟电容 |
| DOI：DOI: 10.19783/j.cnki.pspc.210398 |
| 投稿时间：2021-04-12修订日期：2021-09-29 |
| 基金项目:国家自然科学基金项目资助(61973109) |
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| Design of a dynamic nonlinear VDCOL controller with additional virtual capacitance |
| ZHU Hongping,LI Yi,ZHOU Zhenyi,ZHU Hongzhi,QIAN Wanming |
| (1. School of Information and Electrical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
2. Changsha Power Supply Branch, State Grid Hunan Electric Power Co., Ltd., Changsha 410000, China) |
| Abstract: |
| To effectively restrain the continuous commutation failure of HVDC system under different fault degrees, a dynamic nonlinear voltage dependent current order limiter (VDCOL) controller design scheme with additional virtual capacitors is proposed. First, the conventional VDCOL cannot effectively restrain continuous commutation failure under severe fault because of the insensitive DC current command regulation in an HVDC system, so a dynamic nonlinear VDCOL controller is designed. The linear relationship between voltage and current of the conventional VDCOL is designed to be nonlinear, overcoming the shortcoming that the command current cannot be adjusted flexibly. Considering the variable voltage before and after commutation failure, the voltage is modified by introducing a fault coefficient. Secondly, to improve the sensitivity of the dynamic nonlinear VDCOL controller to mild and moderate faults, an additional virtual capacitor module is designed at the input voltage of the dynamic nonlinear VDCOL to restrain the drop of input voltage when faults occur. Finally, through PSCAD/EMTDC simulation and analysis, the results show that the proposed scheme can effectively restrain continuous commutation failure and shorten fault recovery time under different fault degrees.
This work is supported by the National Natural Science Foundation of China (No. 61973109). |
| Key words: HVDC continuous commutation failure VDCOL dynamic nonlinearity virtual capacitor |
