Optimal Setting for Control Equipment Considering Interconnection of Distributed Generators

Abstract

This paper presents a new parameter setting method for line drop compensator (LDC) and step voltage regulator (SVR) considering interconnection of distributed generators. The proposed method can generate sub-optimal parameter setting considering various loading conditions and power output of distributed generators. Several LDCs and SVRs are sometimes installed in practical distribution systems and coordination of the parameter setting for the LDCs and SVRs should be considered. Therefore, considering various loading conditions and the number of parameters for LDCs and SVRs, the target problem can be formulated as a large combinatorial optimization problem. The objective function is to minimize the difference between a predetermined target voltage and calculated voltages at several nodes and to minimize losses in the target distribution system. The method considers upper and lower limits of voltage at each node and upper limit of current at switches and lines as constraints. The method utilizes a reactive tabu search and an enumeration method for optimization tools. It narrows the appropriate parameter ranges using the reactive tabu search at the first stage. At the second stage, the method optimizes the parameter setting using a multi-stage enumeration method. The feasibility of the proposed method is demonstrated on practical distribution system models with promising results.