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This paper presents a cooperative allocation method of Step Voltage Regulators (SVRs) and Static Var Compensators (SVCs) in case of some distributed generators (DGs) are installed to distribution system. In the proposed method, the Reactive Tabu Search (RTS) with multiple structures and functions has been applied. Firstly, the allocations of SVRs are selected optimally and secondly the tap positions of SVRs are optimized by the RTS. Finally, the locations of SVC are decided to brush up the voltage profile in the distribution network. The proposed method enables us to take account of the installation cost of both SVR and SVC as an economic criterion, the upper and lower limit of voltage at each node and also the upper limit of line currents as constraints. By applying the proposed method to a practical distribution test system, it is verified that this method is efficiency to allocate SVRs and SVCs at the minimum cost and to regulate the system voltages within an appropriate value after introducing distributed generators into a distribution system. In this paper, we applied to a simple radial distribution test system as shown in Fig. 1 and Fig. 2 to verify the efficient of proposal method. This test system is assumed to have two distributed generators for the sake of simplicity. Also, it assumes that the expansion and investment for voltage control equipment are required for the original test system by reason of the increase in loads. The optimal investment for voltage control equipment is solved by the proposed RTS with multiple structures procedure. Two optimization approach were assumed for examining this proposal method and making comparative study. Case 1 is the conventional expansion planning, which does not take connected distributed generators into consideration, and case 2 is proposal method. Figure 1. shows the result of conventional expansion planning and Fig. 2 shows the result of proposal expansion planning. In Fig. 1, the system has three SVRs and two SVC. The other hand, the system has two SVRs and one SVC in Fig. 2. Figure 3 show the voltage profile of both case 1 and case 2 before and after DGs stop. In both two cases, the voltage profile is kept within the reference value of voltage. From these result, proposal method enable us to regulate the system and decrease the investment cost of allocating the voltage control equipment effecively. In this simulation study, though,the system was not so big, this proposal method can decrease the investement cost more when the larger distribution system is applied the proposal expansion planningn method, which consider the connecting DGs and allocate cooperativly. In the future, it is more important to develop more sophisticated approaches to optimize locations and installation capacities of power system controllers to regulate the voltage deviations after introducing many distributed generations. Fig. 1. Result of convensional expansion planning

Cooperative Allocation of SVR and SVC for Voltage Fluctuation in Case of Connecting Distributed Generators