Hybrid microgrid double-end power supply topological system based on power electronic transformer, and multi-operation-mode self-adaptive control method thereof

Abstract

The invention discloses a hybrid microgrid double-end power supply topology system based on a power electronic transformer, and a multi-operation-mode self-adaptive control method thereof. The systemcomprises the power electronic transformer, a primary transformer, a bidirectional inverter, an alternating-current bus and a direct-current bus, a high-voltage alternating-current port of the power electronic transformer is connected to a superior power grid through a grid-connected point, a low-voltage alternating-current port of the power electronic transformer is connected to the alternating-current bus, a low-voltage direct-current port is connected to the direct-current bus, a low-voltage end of the primary transformer is connected to the alternating-current bus, a high-voltage end of the primary transformer is connected to the superior power grid through the grid-connected point, the direct-current end of the bidirectional inverter is connected to the direct-current bus, and the alternating-current end is connected to the primary transformer. A double-end closed-loop power supply topological structure is adopted, so multi-mode flexible operation of the hybrid microgrid is achieved, the power supply reliability of the hybrid microgrid is guaranteed, the problem that the electric energy quality is deteriorated when the hybrid microgrid breaks down is solved, and the using effect is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a hybrid microgrid double-terminal power supply topology system based on a power electronic transformer and a multi-operation mode self-adaptive control method thereof. Background technique [0002] In recent years, the energy revolution centered on renewable energy has evolved rapidly. The development and utilization of renewable energy has become a common choice for all countries in the world to ensure energy security, respond to climate change, and promote low-carbon, green, and sustainable development. Since the access of renewable energy to the AC microgrid requires multi-level energy conversion devices, the DC microgrid does not need frequency control and phase tracking due to the absence of frequency, which can save a lot of power electronic commutation links and significantly improve reliability and controllability. Therefore, the AC-DC hybrid microg...

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Problems solved by technology

[0004] However, the existing AC / DC hybrid microgrids mostly study the coordinated control methods of microgrids, and less consideration is given to using the characteristics of flexible operation of hybrid microgrids to improve system stability.

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