A New Control Strategy of Interlinking Converter in Hybrid AC/DC Microgrid

doi:10.3969/j.issn.1000-7229.2019.11.007

Abstract

Abstract: The hybrid AC/DC microgrid is one of the development directions of power grid in the future. In order to support each others power in the microgrid on both sides， a new control strategy of interlinking converter is proposed in this paper. A two-stage interlinking converter is used to solve the problem of interconnection between DC and AC microgrids when the voltage level of DC microgrid is low， and the DC microgrid can operate normally even when the voltage varies in a large range. According to the characteristics of the two-stage interlinking converter， mathematical relationship between the frequency of AC microgrid and the voltage of DC capacitor is derived. The droop control of voltage error-power is adopted in the power control loop， and the power support of the subnetworks on both sides can be realized without communication. PSCAD simulation result verifies the effectiveness of the control strategy.

Key words: hybrid AC/DC microgrid, interlinking converter, mutual power support, droop control of voltage error-power

CLC Number:

TM 46

ZHU Yongqiang,ZHANG Quan,LIU Kang,WANG Zhi， HAN Minxiao. A New Control Strategy of Interlinking Converter in Hybrid AC/DC Microgrid[J]. Electric Power Construction, 2019, 40(11): 48-54.

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