Three-phase interleaved Boost integrated bidirectional CLLLC resonant converter and control method thereof

Abstract

The invention discloses a three-phase interleaved Boost integrated bidirectional CLLLC resonant converter and a control method thereof, and belongs to the technical field of power electronic converters. The converter is composed of a primary side circuit, a secondary side circuit, an isolation transformer and a CLLLC type resonance network; and bidirectional energy flow between a primary side power supply and a secondary side power supply can be achieved by controlling the duty ratio of a primary side full-bridge unit switch tube. A non-isolated three-phase interleaved Boost converter and an isolated bidirectional CLLLC resonant converter are integrated, so that switch bridge arm multiplexing is realized, the number of switch tubes is reduced, the loss and the cost are reduced; a symmetrical resonant tank structure ensures consistent resonant network characteristics during forward and reverse operation, and the design difficulty is reduced. The converter and control method thereof of the invention have the advantages of high efficiency, high power density, wide voltage gain, low input current ripple, natural and smooth switching of energy flow direction and the like, and are particularly suitable for the fields of direct-current micro-grids containing energy storage systems, electric vehicles, new energy power generation and the like.

Description

technical field [0001] The invention relates to the technical field of power electronic converters in energy storage systems, electric vehicles, and new energy power generation systems, in particular to a three-phase interleaved Boost integrated bidirectional CLLLC resonant converter and a control method thereof. Background technique [0002] In today's world, the energy problem is becoming more and more serious. The energy shortage and the environmental pollution caused by the use of traditional energy have become major challenges that we have to face. In this context, the development and innovation of related technologies for the application of a large number of renewable distributed energy sources such as wind power and photovoltaics has attracted more and more attention. In order to improve the impact of the unstable output of renewable energy on power quality, it is often necessary to add energy storage units to improve the stability of the system. [0003] In the powe...

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Problems solved by technology

[0005] In order to solve the deficiencies in the prior art, the present invention provides a three-phase interleaved Boost integrated bi-directional CLLLC resonant converter and its control method, aiming at solving the problem that the energy cannot flow bidirectionally and the input current ripple in the existing multi-phase resonant converter Large waves, limited range of voltage adjustment, asymmetrical bidirectional operation

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