高压直流断路器中电磁斥力快速驱动器研究

应用在基于电压源型换流的多端直流输电系统中的高压直流断路器,其关键部件机械式快速隔离开关在断路器开断故障电流时需要在几ms内分闸到位。为此,提出了基于电磁斥力的快速驱动器作为快速隔离开关的操动机构。通过对电磁斥力机构的线圈、金属盘、控制电流和行程特性的基于等效电路法的建模仿真及装置试验,研究了其在几ms内操动行程达25 mm的可行性。结果表明:仿真结果和试验结果具有一致性;电磁斥力快速驱动器的操动行程能在几ms内达到25 mm。在验证了仿真方法正确的基础上,根据仿真结果提出了电磁斥力机构的一般设计原则:线圈的内径和金属盘的内径,线圈的外径和金属盘的外径都应该设计成一样大;金属盘的厚度对于不同的设计对应有最优的参数;线圈和金属盘的初始距离应尽量小。

Short-circuit fault analysis and isolation strategy for matrix converters

The behavior of matrix converter(MC) drive systems under the condition of MC short-circuit faults is comprehensively investigated. Two isolation strategies using semiconductors and high speed fuses(HSFs) for MC short-circuit faults are examined and their performances are compared. The behavior of MC drive systems during the fuse action time under different operating conditions is explored. The feasibility of fault-tolerant operation during the fuse action time is also studied. The basic selection laws for the HSFs and the requirements for the passive components of the MC drive system from the point view of short-circuit faults are also discussed. Simulation results are used to demonstrate the feasibility of the proposed isolation strategies.

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