摘要
采用架空线的柔性直流输电系统是解决大规模清洁能源并网外送的有效方案,但架空柔直系统发生瞬时性直流短路故障概率较大,需配置有效的快速重启方法以增强架空柔直系统的利用率。常规的故障重启方法在重合闸于永久性故障时,会对柔直系统中的关键设备产生二次过电流冲击,甚至会损坏某些关键设备,也降低了直流电网的利用率。该文提出一种基于混合型MMC主动信号注入的直流故障自适应重合闸方法,通过在混合型MMC极控制器中加入故障性质辨识控制模式,在故障隔离后向直流系统主动注入特征信号进行故障性质判别,避免重合闸于永久性故障,提高系统安全性。该方法抗噪声干扰能力强,具有较好的工程应用价值。在PSCAD/EMTDC平台搭建含耦合型机械式直流断路器的混合型MMC直流输电系统的电磁暂态模型,仿真验证所提方法的正确性和有效性。
The flexible DC power grid using overhead lines is an effective solution to the large-scale grid-connected of clean energy.However,the transient DC short-circuit fault probability of the overhead direct transmission system is very high,so an effective restart method should be configured to enhance the utilization rate of the overhead direct transmission system.When a permanent fault is reclosing in the conventional fault restart method,the key equipment in the DC power grid will bear the overcurrent shock again,and even some key equipment will be failed.In this paper,a DC fault adaptive reclosing method based on active signal injection of hybrid MMC was proposed.After fault isolation,the system was proactively injected with characteristic signals to identify fault properties,so as to avoid reclosing to permanent fault and improve system security.The method is robust with different transition resistance and noise interference.The electromagnetic transient model of DC transmission system with mechanical DC circuit breaker was built on PSCAD/EMTDC platform to verify the correctness and effect of the proposed method.
作者
蔡普成
向往
周猛
倪斌业
文劲宇
CAI Pucheng;XIANG Wang;ZHOU Meng;NI Binye;WEN Jinyu(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(School of Electrical and Electronic Engineering,Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第12期3867-3877,共11页
Proceedings of the CSEE
基金
国家自然科学基金项目(51807071,U1766211)。
