Guangtongxin yanjiu (Dec 2023)
Innovative Practice of Protection Private Communication Network in Suzhou Electric Power Grid
Abstract
【Objective】Focusing on the strategic goal of building an internationally leading energy Internet enterprise with Chinese characteristics, in accordance with the promotion of the deep integration and application of advanced information and communication technologies and advanced energy technologies, and focusing on the overall requirements of improving the power communication network to support and guarantee the safe operation of the power grid, Suzhou Electric Power launched the construction of a 220 kV protection private communication network since 2019. There exist problems with the 220 kV relay protection channel in Suzhou, such as long repair time, high occupancy of communication cabinet resources, and mixed networking of protection and communication services, which pose hidden dangers to the safe operation of the power grid.【Methods】This paper analyzes the current status and existing problems of Suzhou 220 kV relay protection channel. Combined with the actual situation of optical communication network in Suzhou, this paper proposes using 2 Mbit/s optical interface to directly connect protection equipment for carrying the relay protection channel of B port, and refines the power transformation plan, networking mode, protection business bearing mode, and network management bearing mode.【Results】Utilizing the respective characteristics of the direct channels with fiber optic and the multiplexing channels with protection private communication network, Suzhou Electric Power has built a protection private communication network which covers all transformer substations owning 220 kV outlets by customizing the small private communication transmission equipment that matches relay protection services.【Conclusion】The protection private communication network accessing to the centralized transmission equipment network management could monitor relay protection channels and achieve the observability and testability of the relay protection channels. It has advantages such as rapid failure positioning, failure isolation, and channel detour and comprehensively improves the reliability, independence, flexibility, and operation convenience of the relay protection channels. The protection private communication network has achieved significant application results and innovative results, which is also a beneficial exploration for the application of " 3 routes" for the protect channels.
