10kv配电网相控重合闸策略研究及应用电机与电器专业论文.docxVIP

10kV配电网相控重合闸策略研究及应用Research 10kV配电网相控重合闸策略研究及应用 Research and Application of Controlled Reclosing Strategy for 1 0kV Distribution Network Abstract Rcclosing can greatly improve the supply reliability of power system，however when reclosing at permanent fault，the followed huge current will be an enormous pressure to power system．In order to realize security reclosing at 1 0kV power distribution network,through combining with controlled switching technology，two-phase synchronous controlled reclosing strategy has been used to complete the reclosing．111e pair combinations in three phases were reclosed synchronously in turn at optimal voltage phase angle to control the reclosing current peak value and duration time．r111c parameters of reclosing circuit Can be identifying by a parameter identify algorithm,and the fault type Can be determine by compared the calculated periodic component peak value with血e preset threshold value of permanent fault． Firstly，this paper carries on simulation analysis to controlled reclosing theory，and obtains conclusion that the reclosing voltage phase is the key point to decide the reclosing current peak value and duration time．According to simulation analysis of reclosing parameter identification algorithm,135。and 315。has been selected as也e optimal reclosing phase． Finally，the simulation result of controlled reclosing process show that，based on hish-speed actuator，reclosing current peak value and duration time Can be significantly reduce when using controlled reclosing theory． Based on the theory of condoned reclosing and requirement of processing speed and sequence control，choosing FPGA as main control chip，a controlled reclosing control system was designed．The design idea and the function of hardware circuit have been introduced in detail．ne software design of the control system Was accomplished by Verilog HDL language． The program correctness was verified by Modelsim simulation results of controlled sequence and output of key module programs