| 引用本文: | 黄方能,梅 勇,周 剑,雷傲宇,许 琴.基于正序电流的风电接入电网自适应阈值差动保护方案[J].电力系统保护与控制,2022,50(6):117-124.[点击复制] |
| HUANG Fangneng,MEI Yong,ZHOU Jian,LEI Aoyu,XU Qin.Adaptive threshold differential protection scheme for wind power integration based on positive sequence current[J].Power System Protection and Control,2022,50(6):117-124[点击复制] |
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| 摘要: |
| 随着风电渗透率的不断提高，风电不确定性和间歇性对电网保护方案的影响愈加显著，基于固定阈值的保护整定方案不再适用于复杂多变的电力系统。基于此，提出了基于正序电流的风电接入电网自适应阈值差动保护方案。首先，以含风电场的标准电力系统为例，剖析了风电“T”型接入对传统电流差动保护的影响机理。在此基础上，以正序电流为故障信号，以故障位置和故障发生时间为自变量，建立了自适应阈值差动保护模型。为了提高求解效率以适应保护控制的要求，提出了基于PSO算法的二阶段求解方法。其中：阶段1以故障位置为优化变量，得到对阈值影响最高的故障类型；阶段2在阶段1的基础上引入故障开始时间，仅针对阶段1得到的故障类型进行二维优化，可以明显缩短计算时间，以实现阈值计算的快速性和准确性。最后，基于Matlab仿真分析，验证了该方法的正确性和有效性。 |
| 关键词: 差动保护 风电 正序电流 自适应阈值 粒子群优化(PSO) 二阶段求解方法 |
| DOI：DOI:10.19783/j.cnki.pspc.210357 |
| 投稿时间：2021-04-01修订日期：2022-10-18 |
| 基金项目:国家重点研发计划项目资助“工业园区多元用户互动的配用电系统关键技术研究与示范”(2016YFB0901300) |
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| Adaptive threshold differential protection scheme for wind power integration based on positive sequence current |
| HUANG Fangneng,MEI Yong,ZHOU Jian,LEI Aoyu,XU Qin |
| (1. CSG Power Dispatching Control Center, Guangzhou 510663, China;
2. China Energy Engineering Group Guangdong Electric Power Design Institute Co., Ltd., Guangzhou 510663, China) |
| Abstract: |
| With the continuous improvement of wind power penetration, the impact of wind uncertainty and intermittence on power grid protection schemes is increasingly significant. A protection setting scheme based on a fixed threshold is no longer suitable for complex and changeable power systems. In view of this, this paper proposes an adaptive threshold differential protection scheme for a power grid with large-scale wind power based on positive sequence current. First, taking the standard power system with a wind farm as an example, the influence mechanism of wind power "T" access on traditional current differential protection is analyzed. Then, taking positive sequence current as the fault signal and taking the fault location and occurrence time as independent variables, an adaptive threshold differential protection model is established. In order to improve the solution efficiency to meet the requirements of protection control, a two-stage solution method based on a PSO algorithm is proposed. In phase 1, the fault type with the highest impact on the threshold is obtained by taking the fault location as the optimization variable; phase 2 introduces the fault start time on the basis of phase 1, and carries out two-dimensional optimization only for the fault types obtained in phase 1. This can significantly shorten the calculation time, so as to realize the rapidity and accuracy of threshold calculation. Finally, the correctness and effectiveness of this method are verified by simulation analysis based on Matlab.
This work is supported by the National Key Research and Development Program of China (No. 2016YFB0901300). |
| Key words: differential protection wind power positive sequence current adaptive threshold particle swarm optimization (PSO) two-stage solution method |
