混合式高压直流断路器控制保护系统

直流断路器作为柔性直流电网的关键设备,用于故障快速隔离和恢复,大大提高了直流电网的安全性和可靠性。文中基于混合式高压直流断路器,详细研究了其控制保护架构和控制保护策略。首先设计了"冗余双重化"控制系统架构和"三取二"保护系统架构,具有架构层级清晰和功能分配明确等特点;然后给出了混合式直流断路器的分闸和合闸控制策略,并详细设计了本体过流保护策略、本体设备保护策略和辅助设备保护策略;最后研制了一套500 kV/25 kA混合式高压直流断路器的控制保护系统,并通过实时数字仿真系统(RTDS)进行仿真研究,结果验证了控制保护系统及其策略的正确性和有效性。

Hybrid HVDC circuit breaker control and protection system

As the key equipment of flexible DC power grid, DC circuit breaker is used for fault fast isolation and recovery, which greatly improves the security and reliability of DC power grid. Based on the hybrid high voltage DC circuit breaker, the control and protection architecture and control protection strategy are studied in detail. First of all, the "redundancy dual" control system architecture and the "two out of three" protection system architecture are designed, which have the characteristics of clear architecture level and clear function allocation. Then, the opening and closing control strategies of the Hybrid DC circuit breaker are given, and the overcurrent protection strategy, the main equipment protection strategy and the auxiliary equipment protection strategy are designed in detail. Finally, a set of control and protection system of 500kV/25kA hybrid high voltage DC circuit breaker is developed and simulated by real-time digital simulation system (RTDS). The results show that the control and protection system and its strategy are correct and effective.