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Power electronic transformer suitable for hybrid micro-grid and coordinated control and mode switching method thereof

A technology for power electronics and transformers, applied in the fields of power electronic transformers and their coordinated control and mode switching, can solve problems such as power quality deterioration, AC/DC microgrid power imbalance, etc., to solve the AC/DC microgrid power imbalance problem, Improve the use effect and the effect of flexible operation

Inactive Publication Date: 2020-01-14
SOUTHEAST UNIV +4
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Problems solved by technology

[0006] Purpose of the invention: In order to overcome the deficiencies in the prior art, provide a power electronic transformer for hybrid microgrid and its coordinated control and mode switching method, which realizes the multi-mode flexible operation of hybrid microgrid and solves the problem of hybrid microgrid Power imbalance problem of AC / DC microgrid when off-grid and deterioration of power quality during operation mode switching

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  • Power electronic transformer suitable for hybrid micro-grid and coordinated control and mode switching method thereof
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  • Power electronic transformer suitable for hybrid micro-grid and coordinated control and mode switching method thereof

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Embodiment Construction

[0030] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0031] In this embodiment, the power electronic transformer acts on the hybrid microgrid, such as figure 1 As shown, the hybrid microgrid system includes low-voltage AC grid, low-voltage DC grid, three-port high-voltage high-power power electronic transformer, AC side circuit breaker (QF1), DC side circuit breaker (QF2), power electronic transformer includes input stage, isolation conversion The input stage includes multiple H-bridge cascaded converters (HM), the isolation conversion stage includes multiple dual active bridge converters (DAB), and the output stage includes a three-phase voltage source PWM inverter (VSI). , set the power flowing through the point of common coupling (Point of Common Coupling, PCC), QF1 and QF2 are P hv , P ac and P dc , taking the direction of injection into PET (the direction indicated by the arrow in the fig...

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Abstract

The invention discloses a power electronic transformer suitable for a hybrid micro-grid and a coordinated control and mode switching method thereof. The transformer includes an input stage, an isolation conversion stage, and an output stage. The input stage includes an H-bridge cascade converter. The isolation conversion stage includes dual active bridge converters. The output stage includes a three-phase voltage source inverter. A high-voltage alternating current input port is connected with the alternating current side of the H-bridge cascade converter. The high-voltage side of each dual active bridge converter is connected with the direct current capacitor of the H-bridge cascade converter, and the low-voltage side is connected in parallel with a low-voltage direct current output port.The direct current side of the three-phase voltage source inverter is connected with the low-voltage direct current output port, and the alternating current side is connected with a low-voltage alternating current output port. The low-voltage direct current output port is connected with the low-voltage direct current grid of the hybrid micro-grid system. According to the invention, multi-mode flexible operation of the hybrid micro-grid is realized; the problem of alternating current-direct current micro-grid power imbalance caused by the off hybrid micro-grid is solved; and the problem of power quality deterioration caused by operating mode switching is solved.

Description

technical field [0001] The technical field of power electronics of the present invention specifically relates to a power electronic transformer suitable for a hybrid microgrid and a coordinated control and mode switching method thereof. Background technique [0002] Compared with traditional power generation technology, distributed power generation has the advantages of less pollution, convenient maintenance, and low transmission cost. However, the access of a large number of uncontrollable distributed power sources will bring impact to the power grid and reduce the power quality of the power grid. In order to connect distributed power sources as much as possible and coordinate their interactive operation with large power grids, distributed power It is a small power generation and distribution system composed of energy devices, energy conversion devices, related loads, monitoring and protection devices, that is, micro grids. [0003] Since distributed power sources are conn...

Claims

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Application Information

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IPC IPC(8): H02J3/48H02J3/38H02J3/32
CPCH02J3/48H02J3/381H02J3/32
Inventor 吴在军李俊杰宁文远莫小林杨士慧刘海军赵贺韦凌霄
Owner SOUTHEAST UNIV
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