Control of Distributed Generation Systems Part II: Load Sharing

M. N. Marwali, J. W. Jung, and A. Keyhani
Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA

This paper appears in: IEEE Transactions on Power Electronics
Publication Date: November 2004
On page(s): 1551-1561
Volume: 19, Issue: 6

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Abstract:
This paper is concerned with the control strategy for the parallel operation of distributed generation systems (DGS) in a standalone AC power supply. The proposed control method uses only low-bandwidth data communication signals between each generation system in addition to the locally measurable feedback signals. This is achieved by combining two control methods: droop control method and average power control method. The average power method with slow update rate is used in order to overcome the sensitivity about voltage and current measurement errors. In addition, a harmonic droop scheme for sharing harmonic content of the load currents is proposed based on the voltages and currents control algorithm presented in Part I: Voltages and Current Control. Simulation studies using two parallel three-phase PWM inverters (600 kVA) are presented to show the effectiveness of the proposed control.