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The Zhangbei DC grid project is the world's first DC grid project, which comprises 14 hybrid DC circuit breakers. The hybrid DC circuit breakers usually include power electronic modules, ultra-high-speed mechanical switches, power supply system, water cooling systems, OCT (Optical Current Transformer) and other auxiliary equipment. The control and protection equipment of the hybrid DC circuit breaker has complex functions, huge number of interfaces to connect other devices, many functional test items, and lacks effective testing methods. In this paper, a digital-analog testing method for control and protection equipment of hybrid DC circuit breaker is presented. Then, the detailed design methods of the digital simulation part and the analog simulation part are described respectively. The simulation methods of OCT, fast mechanical switch, power supply system and other equipment in the dynamic simulation test platform are introduced. A hybrid dynamic simulation test platform for hybrid DC circuit breaker is developed, and the function tests of DC circuit breaker control and protection equipment are completed on this platform. The test platform is highly equivalent and can satisfy the full-function test demand of DC circuit breaker control and protection system. It provides an effective verification means for control and protection equipment of hybrid DC circuit breaker for Zhangbei DC grid.
Inspec keywords: power system control; analogue simulation; cooling; current transformers; power electronics; power system simulation; power grids; power system protection; circuit breakers
Subjects: Transformers and reactors; Power system control; Power system protection; Power convertors and power supplies to apparatus; Control of electric power systems; Switchgear; Power electronics, supply and supervisory circuits; Power engineering computing