Full-bridge three-port bidirectional direct-current converter and control method thereof

Abstract

The invention discloses a full-bridge three-port bidirectional direct-current converter and a control method thereof, belonging to the field of power electronics converters. The converter is composed of a primary side circuit, a secondary side circuit and an isolation transformer, wherein the primary side circuit is composed of a full-bridge circuit integrating two paths of Buck-Boost converters, and the secondary side circuit is composed of the full-bridge circuit; and the converter comprises three ports in total, the power of each port is available for bidirectional flow, and the power control of any two ports can be realized at the same time by controlling the duty cycle of switching tubes in the two full-bridge circuits and the phase shift angles of the corresponding switching tubes of the two full-bridge circuits. According to the invention, by integrating a non-isolation bidirectional Buck-Boost converts and a full-bridge bidirectional converter to constitute the integrated three-port converter and simultaneously realize the power control of multiple ports, the quantity of used switch devices is reduced, the cost is reduced, the power density and reliability are increased, and the full-bridge three-port bidirectional direct-current converter is suitable for new energy power generation, hybrid energy storage and other power supply systems.

Description

technical field [0001] The invention relates to a full-bridge three-port bidirectional DC converter and a control method thereof, belonging to the technical field of power electronic converters, in particular to the technical field of power electronic converters in the technical fields of new energy power generation and hybrid energy storage. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, new energy power generation has become one of the most effective measures to achieve sustainable development of mankind. The inherent defects of new energy power generation equipment have brought some new difficulties and challenges to the new energy power supply system. For example, solar and wind energy have low energy density, are greatly affected by the external environment, and the power supply is unstable and discontinuous. In order to solve the above problems, an energy storage device with a certain capacity is usually used to b...

AI Technical Summary

Problems solved by technology

A three-port converter with all isolated ports is usually composed of multiple transformer windings coupled. This type of three-port converter has better port adaptability due to the isolation of each port, but the number of devices used is large and the control is complicated.

The non-isolated three-port converter does not require isolation conversion and has high efficiency, but the port adaptability is not good, so it can only be applied to applications where the voltages between the ports are close to each other

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