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Alternative TitleMicrogrid inverter grid disconnection/connection seamless switching control method based on phase angle estimation
卞晶; 臧传治; 曾鹏
Rights Holder中国科学院沈阳自动化研究所
Patent Agent沈阳科苑专利商标代理有限公司 21002
Other AbstractThe invention relates to a microgrid inverter grid disconnection/connection seamless switching control method based on phase angle estimation. An energy storage system serves as a main power supply, and comprises an energy storage battery, a current transformer, and a PCS mode controller. In a grid connection mode, PQ control is employed; in an island mode, V/F control is employed. During the switching from the grid connection mode to the island mode, a voltage amplitude reference value is given by a phase voltage peak value of a power grid before grid disconnection, and is calculated through a mean value of angular frequency of the power grid before grid disconnection and an instant phase angle at the moment of grid disconnection. During the switching from the island mode to a grid connection mode, a phase angle reference value of the inverter in the V/F mode is modified through a phase angle estimation algorithm based on an instant voltage value of the power grid, the phase angle of the power grid is tracked quickly, and a precise voltage phase angle is employed for replacing an estimation value after the stable phase locking of PLL. Through the superposing of frequency interference quantities, the method judges whether the grid connection of a microgrid is completed or not. The method changes the corresponding control modes, and achieves the seamless switching.
PCT Attributes
Application Date2014-12-16
Date Available2018-01-02
Application NumberCN201410784176.0
Open (Notice) NumberCN105762829A
Contribution Rank1
Document Type专利
Recommended Citation
GB/T 7714
卞晶,臧传治,曾鹏. 基于相角估算的微电网逆变器离并网无缝切换控制方法[P]. 2016-07-13.
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