Four-port direct-current converter and control method thereof

Abstract

The invention, which belongs to the power electronic converter technology field, discloses a four-port direct-current converter and a control method thereof. The four ports of the four-port direct-current converter are respectively connected with a first input source, a second input source, a storage battery, and a load, wherein a load end is electrically isolated with the other three ports by the converter; the control method enables power of the four ports of the converter to be controlled. According to the invention, power management and control of the first input source, the second input source, the storage battery, and the load can be realized simultaneously by a converter; and thus functions of a plurality of single-input and single-output converters are realized by a converter. Compares with a solution scheme with utilization of a plurality of converters, a solution scheme of the invention has the following advantages that: the number of switching elements and relevant control circuits are reduced; the cost, volume and weight of circuits are reduced; device loss is reduced; transformation efficiency is improved; the whole converter is controlled uniformly; power management can be realized effectively; and stability and reliability of the system can be improved.

Description

technical field [0001] The invention relates to a four-port DC converter in a power converter and a control method thereof, belonging to the technical field of power electronic converters, in particular to the technical field of power converters in new energy power generation technology. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, thermoelectric generator, solar energy, wind energy, fuel cell power generation and other new energy power generation technologies have become the focus of attention and research around the world. [0003] There are some inherent defects in new energy power generation equipment: 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 ener...

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Problems solved by technology

[0003] There are some inherent defects in new energy power generation equipment: 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.An integrated four-port DC / DC converter for renewable energy applications.IEEE Transactions on Power Electronics, 2010, vol.25, no.7, pp.1877-1887." proposed a The four-port converter is used for the power management of the combined wind and light power supply system. The structure of the converter is complex and the two input sources can only supply power to the load in a time-sharing manner, that is, the two input sources cannot supply power to the load at the same time.

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