A bidirectional DC converter power loop topology suitable for three-level double half-bridge

Abstract

The invention belongs to the technical field of power electronic converters, in particular to a bi-directional DC converter power loop topology suitable for three-level double half-bridge. The power loop topology comprises a high-frequency transformer and primary and secondary circuits connected on both sides of the high-frequency transformer. The primary side circuit comprises a primary side halfbridge circuit connected with a high frequency transformer, a first clamping bridge arm connected with the primary side half bridge circuit and a high voltage side power supply, a first resistor circuit connected with a high side voltage power supply, a first capacitor circuit and a power inductance connected between the primary side half bridge circuit and the primary side of the high frequencytransformer. The secondary side circuit includes a secondary side half-bridge circuit connected to a high frequency transformer, a second clamping bridge arm and a low voltage side power supply connected to the secondary side half-bridge circuit, and a second resistor circuit and a second capacitor circuit connected to a low voltage side power supply. This power loop topology is suitable for highvoltage on one side and high current on the other side. The number of fully controlled devices used is small, the cost is low, and the operation difficulty is low.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, and in particular relates to a bidirectional DC converter power loop topology suitable for three-level double half-bridges. Background technique [0002] In recent years, with the continuous development of new energy technologies, a large number of power systems have been connected. However, due to the instability of new energy power generation, it is easy to cause fluctuations in the grid after being connected to the grid, affecting the normal operation of the grid, and even some unnecessary accidents. [0003] Since the energy storage system can be connected to the power system, by controlling the charging and discharging of the energy storage system, new energy can be effectively used to generate electricity and the quality of power supply can be improved, so a double full bridge DC-DC is proposed. [0004] In the proposed dual full-bridge DC-DC, the bidirectional flow of ...

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Problems solved by technology

[0005] However, in the current two three-level full-bridge circuits, the obvious problem is that the number of switching tubes is large, the cost is relatively high, and the switching loss of the switching tubes is relatively large, and at the same time, there are many driving signals to drive the switching tubes, so that the realization of more difficult

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