Non-isolated three-port series-parallel integrated converter
A three-port, converter technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems that the voltage and current cannot meet the requirements of safe operation, the input source cannot directly transfer energy, and the utilization rate of new energy is not very high. Achieve the effect of avoiding system crash, improving system reliability, reducing system size and cost
Inactive Publication Date: 2016-08-17
YANSHAN UNIV
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Problems solved by technology
However, the current research on non-isolated multi-input converters is limited to the fact that energy can be transferred between the input source and the load, and the energy cannot be directly transferred between the input sources.
In addition, once a certain input source quits working, it will either increase the load on other input sources, or make the voltage and current on the load unable to meet the safe operation requirements, causing the system to shut down, and even damage the equipment in severe cases.
Therefore, the stability and flexibility of this type of topology are not strong, the utilization rate of new energy is not very high, and the application range is relatively limited. Therefore, it is necessary to seek a method that can directly transfer energy between input sources and has flexible compensation and fault tolerance. The non-isolated topology of the scheme is of great significance
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[0024] The present invention will be further described below in combination with the accompanying drawings and specific embodiments.
[0025] Such as figure 1 In the shown electrical schematic diagram of the present invention, the integrated converter of the present invention includes a first input DC voltage source V in1 , the second input DC voltage source V in2 , the first input voltage stabilizing capacitor C 1 , The second input voltage stabilizing capacitor C 2 , the first switch unit, the second switch unit, the third switch unit, the fourth switch unit, the output diode D O , inductance L, output capacitance C and load R;
[0026] The first switch unit includes a diode D 1 and the first main switch S 1 ; The first input DC voltage source V in1 with capacitance C 1 in parallel, capacitor C 1 The anode of the diode D is connected 1 the cathode of the diode D 1 The anode of the first main switch S is connected 1 collector of the first main switch S 1 The emit...
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The invention discloses a non-isolated three-port series-parallel integrated converter topology, which belongs to the technical field of power electronic conversion. The integrated converter includes an input DC voltage source V in1 and V in2 , voltage regulator capacitor C 1 and C 2 , the first switch unit, the second switch unit, the third switch unit, the fourth switch unit, the output diode D O , an inductance L, an output capacitor C and a load R; an energy storage capacitor is connected in parallel on each input side, and a fourth switch unit is introduced to connect the two input sources. When the photovoltaic is out of work, the photovoltaic side capacitor is charged intermittently through the introduced switch tube to keep the input voltage of this side stable, thereby ensuring the stability of the load voltage; when the photovoltaic energy is sufficient, the direct energy transfer between the photovoltaic port and the battery port is realized. Improve the utilization rate of new energy. The invention has the advantages of small size, low cost, high integration, realizing power conversion between ports, flexible compensation, and high system stability and reliability.
Description
technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to a three-port series-parallel integrated converter. Background technique [0002] With the increasing demand for electricity, the large-scale exploitation and utilization of fossil energy has made the world's energy situation increasingly tense. At the same time, the large amount of waste gas produced by the combustion of fossil fuels has caused serious environmental pollution. Since new energy is clean, pollution-free and rich in resources, using new energy to generate electricity is an important way to solve the contradiction between energy development and environmental protection. At present, wind power generation, photovoltaic power generation, fuel cell power generation, geothermal power generation and tidal power generation are widely used in the form of new energy power generation. A variety of complementary new energy sources are usually combined and e...
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IPC IPC(8): H02M3/06H02M3/08
Inventor 孙孝峰周悦李昕
Owner YANSHAN UNIV