Booster type non-isolated three-port DC converter and control method thereof

Abstract

The invention discloses a booster type non-isolated three-port DC converter and a control method thereof, and belongs to the technical field of power electronic converters. The booster type non-isolated three-port DC converter is composed of two switching tubes, a two-way switch, two diodes, a high-frequency filter inductor, a coupling inductor containing two windings, four capacitors, two DC sources and a load. According to the invention, two-way power transmission between the two DC sources is controlled through adjusting the duty ratio of the two switching tubes, and the power, which is transmitted to the load by the two DC sources, is controlled through adjusting the duty ratio of the two-way switch. Power transmission and control between the two DC sources and the load are realized simultaneously only through one converter, and functions of a plurality of single-input-single-output converters are realized. In addition, the booster type non-isolated three-port DC converter can also realize soft switching of the switching tubes, the two-way switching tube and the diodes, and can effectively reduce the switching loss and improve the efficiency.

Description

technical field [0001] The invention relates to a step-up non-isolated three-port DC converter and a control method thereof, belonging to the technical field of power electronic converters. Background technique [0002] Large-scale renewable energy access is a major issue that needs to be solved in the development of energy Internet. New energy power generation systems represented by photovoltaic power generation and wind power generation have obvious intermittent and random characteristics. Realizing the efficient storage and conversion of intermittent and random electrical energy is the only way to solve the above problems. Therefore, energy storage will play a vital role in the stable control of the entire system, the improvement of power quality and uninterrupted power supply. [0003] In a renewable energy power supply system including energy storage devices, it is necessary to simultaneously perform power management and control on multiple renewable energy power gene...

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Problems solved by technology

Document "Hongfei Wu, Kai Sun, Shun Ding, Yan Xing. Topology Derivation of Non-isolated Three-Port DC-DC Converters from DIC and DOC. IEEE Transactions on Power Electronics, 2013, 28(7): 3297-3307" system A method of constructing a non-isolated three-port converter is proposed, but the basis of this type of three-port converter is the traditional two-port non-isolated converter. The resulting non-isolated three-port converter mainly has the following problems: (1) The boost capacity is limited, which cannot meet the requirements of renewable energy power generation devices and battery energy storage devices for boost capacity; (2) The converter has only one bidirectional end, which cannot meet the requirements for connecting multiple energy storage devices or for energy storage devices. Connection with energy feedback DC bus; (3) The switching tube cannot realize soft switching, and the efficiency is low; (4) The control of each port is coupled with each other, and the design and implementation of the control system are complicated

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