Power Loss Reduction for Power Trading between Interconnected Microgrids Using Batteries

A scheme to reduce power loss for interconnected microgrids by using multiple batteries is proposed. The battery functions are deployed on the path between supply and demand microgrids. In the proposed scheme, the power loss of not only transmission but also charging and discharging are considered. Specifically, the power loss of power trading among microgrids is reduced by minimizing an objective function of mathematical programming problem that is defined by a total power loss due to the transmission, charging, and discharging of power. The proposed method is evaluated by simulation. In the evaluation, as an example, the interconnected microgrids are composed of 48 microgrids. In addition, it is assumed that ten microgrids can supply electric power, and ten can be configured to require electric power. Power is assumed to be generated by solar power and consumed at home. In the evaluation, the optimized number of batteries, location of each battery, and transmission paths and power are determined. As a result, compared with a route-based method that considers only transmission length, the proposed method can reduce the power loss more effectively.