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| New Circulation Control Method for Micro-Grid with Multi-Inverter Micro-Sources |
| Lü Zhipeng1, Luo An1, Jiang Wenqian2, Xu Xinwei1 |
| 1. Hunan University Changsha 410082 China 2. Guangxi Electric Power Research Institute Nanning 530023 China |
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Abstract The new method of operating an inverter to imitate a synchronous generator for circulating current restraint is motivated and developed. Based on the comparison with the traditional droop control method, detail analysis is done on the principles of decoupling between the equivalent line impedance and output reactive power and the advantage of the new method to improving the accuracy of the load power distribution is described. In order to reduce voltage and frequency difference between the paralleled inverters when no-load operating, minor amendment is used to the droop control coefficient to meet the demand of load power distribution between different rated power inverters and circulation suppression and adding differential link to improve the control delays caused by power calculation. Simulation and experiment are done in a small-scale experimental micro-grid system which contains two inverters in parallel. The results are given to verify that the circulation inhibitory is effective in a variety of conditions.
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Received: 25 October 2010
Published: 19 March 2014
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2012, Vol. 27 
