Optimization of Relay Protection Settings for Distributed Photovoltaic Power Stations Connected to Distribution Networks
In order to relieve the power supply pressure of the distribution network,more and more distributed photovoltaic power stations are connected to it,resulting in changes in the structure of the distribution network.Therefore,it is necessary to reset the setting value of relay protection,otherwise it would be difficult for the relay to play its protective role effectively when the distribution network fails.Therefore,a relay protection setting optimization method for distributed photovoltaic power station connected to the distribution network is studied.Taking the minimum sum of relay cooperative action time as the optimization objective,four constraints are set,and the optimal solution of the objective function is obtained by using the differential evolution algorithm to obtain the optimal setting value of the relay starting current and time setting coefficient.The experimental results show that when a two-phase short-circuit fault occurs to the distributed photovoltaic power station,the overall operation time of the relay protection by the proposed setting optimization method is shorter,indicating that the protection setting effect of this algorithm is better,and is more conducive to the relay to quickly eliminate the fault of the distribution network and protect the safety of the distribution network.
distributed photovoltaic power stationdistribution networkobjective functionconstraintsdifferential evolution algorithmrelay protection setting
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