Design Development And Research On The Soft Switching Device In Independent Operation For Bus Of Power Grid

At present, the coal mine power supply usually adopts double power supply mode,mode of operation is usually the parse mode of operation. Double busbar parse operationpower supply mode with coal industry standard, to ensure the mine power supplyreliability and safety, but when the power supply into line or transformer in maintenance,they need to pour brake operation, change the bus operation by parse operation changeto coordinate operation, this kind of transformation bus operation mode process willcause the power supply power transfer lines appear a certain time, for power mustensure uninterruptible power system for coal mine power supply system, this period ofpower will seriously affect the safety of coal production [1]. In order to solve thisproblem, this paper creative design the two bus directly power not pour brake operationof the device-power system soft fall brake device.Bus circulation generation is because in the parse operation of the two bus directlycharged closing operation. Two bus voltage value amplitude difference, phase Angledifference, frequency difference all can affect directly closing operation process is toproduce circulation size. Based on the FACTS technology design of the power systemsoft fall brake device, inhibit or eliminate the occurrence of circulation. Based on theanalysis of power system soft fall brake device’s working principle, put forward thecreative power system soft fall brake devices do not pour brake operation of the powerto move to surge compensation technology, to move to regulating technology key is theoutput voltage phase control. Power system soft fall brake device output voltage controlis divided into the output amplitude control and phase Angle control. In this paper, thephase locked loop technique in the electric power system soft fall brake device isapplied to further study, design the output voltage phase control method, and validation.Power system soft fall brake device system mainly by the testing part, inverter parts,injection structure part, the control part, etc, soft fall brake device of the mastercontroller using DSPIC30F3011single-chip microcomputer.In the theoretical research of the design on the technology of power system softswitching device of prototype, built laboratory double bus power supply system model,adopting large resistance simulation load, using vacuum ac contactor simulation vacuumbreakers. And on this basis the closing operation, break-brake operations related experiments. Through the good man-machine interface, convenient for the fall brakeoperation action instruction, and the power system soft switching device receives therelated instruction for bus voltage compensation operation, realizing the power in notunder the condition of fall brake operation, in the experimental process no big currentproduction, proof that the power system soft switching device practicability andreliability.