对基于智能THD的分布网络故障保护技术进行比较研究
Wael Al Hanaineh1, Jose Matas1, Josep M Guerrero2
1Electric Engineering Department, Polytechnic University of Catalonia (EEBE-UPC), 08019 Barcelona, Spain.
Sensors (Basel, Switzerland)
|July 11, 2023
概括
使用总波扭曲 (THD) 的新故障保护策略提高了配电系统 (DS) 的可靠性. 该SOGI-THD方法提供更快的故障检测和隔离与分布式发电机 (DGs) 的电力系统.
科学领域:
- 电气工程 电气工程
- 电力系统工程 电力系统工程
- 控制系统 控制系统
背景情况:
- 分布式发电机 (DG) 改善了电力供应,但引入了双向电力流,使传统的保护方案复杂化.
- 传统的保护策略需要经常调整继电器的设置,因为网络拓和操作模式的变化.
- 新的故障保护技术对于可靠的运行和防止现代配电系统中麻烦的触发至关重要.
研究的目的:
- 为了比较两个配电系统 (DS) 保护策略,使用总波扭曲 (THD) 水平,估计电压和零序元件.
- 评估这些策略的有效性,特别是那些采用多个第二顺序通用集成器 (MSOGI) 和单个SOGI (SOGI-THD) 的策略,用于故障检测,识别和隔离.
- 评估性能与传统超电流和差异保护方法相比.
主要方法:
- 使用THD,估计的振幅电压和零序元件作为故障指示器,开发和模拟两个DS保护策略.
- 在第一个策略中实施多个第二顺序通用集成器 (MSOGI),并在第二个策略中实施单个SOGI (SOGI-THD) 进行变量估计.
- 利用保护装置之间的通信线路进行协调保护,并在各种故障条件下在MATLAB/Simulink中进行模拟.
主要成果:
- SOGI-THD方法在检测和隔离6-8,5毫秒内故障方面表现出高效率.
- 这种方法需要最小的计算资源,仅在447个处理器周期内执行.
- SOGI-THD方法证明了对波扭曲的稳定性,即使在预先存在的波内容中也能准确检测出故障.
结论:
- SOGI-THD保护策略为分布式发电机的配电系统中故障管理提供了卓越的解决方案.
- 其更快的响应时间,较低的计算负担和对波的稳定性使其相对于传统方法具有优势.
- 集成THD分析为智能电网中的先进故障检测和隔离提供了可靠的指标.
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