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A New Method of Calculation Positive Sequence Voltage of Asymmetric Power Grid and its Application in Grid Connected Inverter
Received date: 2015-08-21
Revised date: 2015-09-25
Online published: 2015-10-30
A new method of calculation positive sequence voltage of asymmetric power grid and the application of the phase locked loop (PLL) based on dq transform is developed in this paper. Because of the negative sequence voltage component in power grid, the output of PLL is not accurate. According to the phase relationship between positive sequence and negative sequence, the trigonometric function method is proposed to extract positive sequence. This method is used in the three-phase voltage phase locked loop based on the dq synchronous reference frame transformation. The accuracy and stability of the PLL in the asymmetric power grid were improved by using this method. The importance of grid voltage feed forward for the control of the inverter was discussed. The advantages of the feed forward control by using positive sequence were analyzed. All the methods were improved in the experiments.
ZHANG Wei1,2, ZHANG Ji-yuan1,2, WANG Hao1, SHU Jie1, DING Jian-ning3 . A New Method of Calculation Positive Sequence Voltage of Asymmetric Power Grid and its Application in Grid Connected Inverter[J]. Advances in New and Renewable Energy, 2015 , 3(5) : 384 -390 . DOI: 10.3969/j.issn.2095-560X.2015.05.010
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