Reconstruction Method of Saturation Current of Current Transformer in Relay Protection Application Related to Wind Power
Huang Zixin, Lin Xiangning, Ma Xiao, Wu Yuqi, Wei Fanrong
State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
Abstract：Conventional researches on relay protection regards anti-saturation for current transformer (CT) as a necessary condition for off-line criterion setting. Actually, a new idea is to use the on-line reconstructed current to participate in the protection calculation. However, after the wind power is connected to the system, mixed fault current of wind power and synchronous generators flows through CT. Among existing saturation current reconstruction studies, numerical calculation methods are difficult to model the interharmonics of wind turbines, and data-driven methods are lacking in calculating speed and noise immunity. In this paper, a CT saturation current reconstruction method in relay protection application was proposed, which can be mainly divided into two stages. In the offline stage, firstly, multiple factors affecting CT saturation were considered when generating the dataset. Next, the stacked long short-term memory network (Stacked LSTM) was trained to build the mapping model of CT primary current to secondary current. Then, the optimal hyper parameter was obtained through Bayesian optimization. In the online stage, noise reduction was carried out for the secondary current in the half cycle after fault, then the secondary current after noise reduction was input into the off-line model to reconstruct the primary current, which can be used in protection calculation. The simulation results show that the proposed method has good robustness and high reconstruction accuracy for current with interharmonics and noise, and can provide effective data for relay protection.
黄梓欣, 林湘宁, 马啸, 吴宇奇, 魏繁荣. 含风电继电保护应用中的电流互感器饱和电流重构方法[J]. 电工技术学报, 2022, 37(19): 4823-4834.
Huang Zixin, Lin Xiangning, Ma Xiao, Wu Yuqi, Wei Fanrong. Reconstruction Method of Saturation Current of Current Transformer in Relay Protection Application Related to Wind Power. Transactions of China Electrotechnical Society, 2022, 37(19): 4823-4834.
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