Four-port direct-current converter

Abstract

The invention relates to a four-port direct-current converter. The four-port direct-current converter comprises a first input source; the positive electrode of the first input source is connected with a first diode, a first inductor and a serially connected common end of a first switching tube and a second switching tube sequentially, and then connected with a corresponding end of a primary winding of a transformer; the positive electrode of the second input source is connected with a second diode, a second inductor and a serially connected common end of a third switching tube and a fourth switching tube sequentially and then connected with a non-corresponding end of the primary winding of the transformer through a bridging capacitor; the negative electrode of the first input source and the negative electrode of the second input source are connected with the negative electrode of a storage battery in parallel and then are connected with the source of the fourth switching tube and the source of the second switching tube; the positive electrode of the storage battery is connected with the drain of the third switching tube and the drain of the first switching tube sequentially; the corresponding end of a first secondary winding of the transformer is connected with a third diode and one end of an output filter inductor; the other end of the output filter inductor is connected withone end of an output filter capacitor and one end of a load; a serially connected connection common end of the non-corresponding end of the first secondary winding and the corresponding end of a second secondary winding is connected with the other end of the output filter capacitor and the other end of the load; and the non-corresponding end of the second secondary winding is connected between the third diode and the output filter inductor through the fourth diode.

Description

technical field [0001] The invention relates to a power converter, in particular to a four-port DC converter used in renewable DC power generation systems such as semiconductor thermoelectric power generation and photovoltaic power generation. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, new energy power generation technologies such as thermoelectric generator (Thermoelectric Generator), solar energy, wind energy and fuel cell power generation have become the focus of attention and research in countries all over the world. However, new energy power generation equipment has the following inherent defects: the output power of power generation equipment is affected by environmental conditions, and the output power changes randomly and is discontinuous and unstable. Therefore, independent new energy power generation equipment cannot independently, stably and reliably supply power to the load. In the independent new energy...

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Problems solved by technology

However, new energy power generation equipment has the following inherent defects: the output power of power generation equipment is affected by environmental conditions, and the output power changes randomly and is discontinuous and unstable. Therefore, independent new energy power generation equipment cannot independently, stably and reliably supply power to the load

Among the multi-port converters, there are many studies on three-port converters, and the technology is relatively mature, while there are fewer studies on multi-port converters containing more ports (such as four ports). The literature "Z. Qian, O .Abdel-Rahman, I.Batarseh.Anintegrated four-port DC / DC converter for renewable energy applications.IEEE Transactions on Power Electronics, 2010, vol.25, no.7, pp.1877-1887." Proposed a four-port The port converter is used for power management of the combined wind and light power supply system, but the output power of the converter is limited by the energy storage of the transformer magnetic core, so it can only be used in small power occasions

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