A Virtual Impedance Optimization Method for Reactive Power Sharing in Networked Microgrid

PROJECT TITLE :

A Virtual Impedance Optimization Method for Reactive Power Sharing in Networked Microgrid

ABSTRACT:

Unlike the standard microgrid with a typical ac bus, networked microgrid continuously suffers a lot of serious reactive power sharing problems due to its complicated inner structure. In such case, the system reactive power sharing error can not be simply evaluated and eliminated. Thus, this paper proposes a wireless control strategy that employs optimized virtual impedance controllers and local load measurements for the reactive power sharing in networked microgrid. First, from the modeling of microgrid network, an estimation technique for network reactive power sharing error is derived. Through the estimation method-based network feature analyses, corresponding design for virtual impedance controller is presented. Then, by introducing genetic algorithm, virtual impedance controller parameters of each distributed generation unit are optimized, which aims to minimize the microgrid global reactive power sharing error. The parameter optimization method is performed offline in microgrid configuration stage. By using these optimized virtual impedance controllers, the reactive power sharing performance of a networked microgird can be greatly improved. Finally, the accuracy of the estimation methodology is validated by MATLAB simulation results, and the feasibility of the proposed virtual impedance optimization methodology is verified through real power experiments.

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