Protection Scheme of Distribution Network with Photovoltaic Power Supply Based on Partition Protection

Abstract

. Taking into account the development trend of distributed photovoltaic power generation, there will be a high permeability of PV in the future distribution network, and the traditional three stage current protection will be no longer applicable because of the malfunction or rejection. In order to maximize the use of distributed photovoltaic power supply, in the future, when there is failure in the power grid, PV should be encouraged to take part of the important load and operated according to the plan. This paper, based on the idea, puts forward a protection scheme for distribution network partition. First of all, according to the load and the principle of balanced PV capacity, carry out partition of distribution network, and then design the fault location algorithm, and finally verify the proposed algorithm by taking the IEEE33 node distribution system as an example. The verification results show that the proposed algorithm of fault region based on matrix algorithm has validity and feasibility. That is to say, this distribution network partition protection scheme with multiple distributed photovoltaic power is feasible.