Stable reactive power balancing strategies of grid‐connected photovoltaic inverter network |
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| Authors: | Zhongkui Wang Kevin M Passino |
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| Affiliation: | Department of Electrical and Computer Engineering, The Ohio State University, Columbus, OH, USA |
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| Abstract: | In this paper, a distributed reactive power control based on balancing strategies is proposed for a grid‐connected photovoltaic (PV) inverter network. Grid‐connected PV inverters can transfer active power at the maximum power point and generate a certain amount reactive power as well. Because of the limited apparent power transfer capability of a single PV inverter, multiple PV inverters usually work together. The communication modules of PV inverters formulate a PV inverter network that allows reactive power to be cooperatively supplied by all the PV inverters. Hence, reactive power distributions emerge in the grid‐connected PV inverter network. Uniform reactive power distributions and optimal reactive power distributions are considered here. Reactive power balancing strategies are presented for both desired distributions. Invariant sets are defined to denote the desired reactive power distributions. Then, stability analysis is conducted for the invariant sets by using Lyapunov stability theory. In order to validate the proposed reactive power balancing strategies, a case study is performed on a large‐scale grid‐connected PV system considering different conditions. Copyright © 2015 John Wiley & Sons, Ltd. |
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| Keywords: | balancing strategy distributed reactive power control grid‐connected PV inverter network Lyapunov stability analysis optimal reactive power allocation |
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