Power Flow Control of a Single Distributed Generation Unit

Min Dai, Member, IEEE, Mohammad Nanda Marwali, Member, IEEE, Jin-Woo Jung, Member, IEEE, and
Ali Keyhani, Fellow, IEEE

Abstract: This research addresses power flow control problem of a grid-connected inverter in distributed generation applications. A real and reactive power control solution is proposed on the basis of an existing voltage control strategy developed for island operations. The power control solution takes advantage of a newly designed system parameter identification method and a nonlinear feedforward algorithm, both of which are based on Newton–Raphson iteration method and implemented in real time. The proposed power control solution also performs grid-line current conditioning and yields harmonic free grid-line current. A phase locked loop based algorithm is developed as a part of the solution to handle possible harmonic distorted grid-line  voltage and maintain harmonic free line current. The effectiveness of the proposed techniques is demonstrated by both simulation and experimental results.

Index Terms: Distributed generation (DG), Newton–Raphson method, parameter estimation, power control, power conversion.

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