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| Effects of Distributed Generation on Steady-State Characteristics of Unbalanced Isolated Power System in Initial Period of Fault Restoration |
| He Xingqi1, 2, Liu Junyong1, Yang Ke2, Xie Lianfang2 |
| 1. Sichuan University Chengdu 610065 China 2.Sichuan Electric Power Company Chengdu 610041 China |
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Abstract The impact of self-excited induction generator on the weak three-phase unbalanced power system in the initial period of black-start is studied. The theoretical formula for the proportion of negative sequence current is obtained by analyzing the steady-state model of an isolated power grid utilizing symmetrical components method and error analysis. Based on this formula, the effect of different operational strategies for a distributed generation grid on the unbalanced degree of the branch current of a synchronous generator is analyzed under constant loading. Analysis results show that an inappropriate control strategy for a self-excited induction generator will reduce the security of the synchronous generator instead. Finally, a comparative analysis between the simulation results and the theoretical calculation verifies the accuracy and the validity of the conclusions.
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Received: 06 May 2009
Published: 07 March 2014
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2011, Vol. 26 
