A kind of multi-port inverter
An inverter and multi-port technology, which is applied in the direction of converting irreversible DC power input into AC power output, can solve the problems of increasing system cost, volume and weight, increasing system power conversion loss, and affecting system energy efficiency ratio. Achieve low cost, reduce system cost, and improve efficiency
Active Publication Date: 2018-08-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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However, this solution requires an additional DC converter, which not only increases the cost, volume and weight of the system, but also increases the loss of power conversion of the system and reduces the efficiency of the system
[0004] Literature "Dongsen Sun, Baoming Ge, Weihua Liang, Haitham Abu-Rub, and FangZheng Peng. An Energy Stored Quasi-Z-Source Cascade Multilevel Inverter-Based Photovoltaic Power Generation System[J]. IEEE Transactions on Industrial Electronics, 2015, 62(9 ): 5458-5467." proposed a cascaded multi-input inverter structure in which multiple quasi-Z source inverters are connected in series, and the inverter can realize the simultaneous access of multiple distributed photovoltaics and distributed energy storage batteries , but each distributed access module needs to use an independent quasi-Z source inverter circuit, and the number of active and passive components used is large, which affects the energy efficiency ratio of the system to a certain extent
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[0037] The present invention will be further described below in conjunction with the accompanying drawings.
[0038] The multi-port inverter of the present invention consists of N power distribution modules (1, 2...N), (N+1) DC input sources (V in1 , V in2 …V in(N+1) ) and an inverter module (20), wherein N is an integer equal to 1 or greater than 1, and the power distribution module includes a positive terminal, a negative terminal and an O terminal. When the number of power distribution modules is 1, the circuit structure of the multi-port inverter of the present invention is as attached figure 1 As shown, the multi-port inverter of the present invention only includes two DC input sources (V in1 , V in2 ), which is equivalent to a dual-input inverter. When the number of power distribution modules is greater than 1, the circuit structure of the multi-port inverter of the present invention is as follows figure 2 It can be seen from the figure that the multi-port inverte...
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The invention discloses a multiport inverter. The multiport inverter comprises N power distribution modules, (N+1) direct current input sources, and an inversion module, wherein N is an integer more than or equal to 1; the N power distribution modules are connected in sequence, wherein the first power distribution module is connected with positive terminals of two direct current input sources, the other power distribution modules are only connected with a positive terminal of one direct current input source, the Nth power distribution module is simultaneously connected with a positive input terminal of the inversion module, and negative terminals of all the (N+1) direct current input sources are connected with a negative input terminal of the inversion module. According to the multiport inverter, power transmission and transformation between the (N+1) independent direct current input sources and an alternating current load or a power grid can be simultaneously realized via one inversion module, the function of various inverters is realized, the power density is high, and the size cost is low; and the voltage stress of power devices in the N power distribution modules is equal to the voltage difference of the direct current input sources, and the voltage stress is low.
Description
technical field [0001] The invention relates to the technical field of power electronic converters, in particular to the technical field of DC-AC power conversion. Background technique [0002] Inverters can realize bidirectional energy transmission and transformation between DC power supply and AC load or AC grid, and have a wide range of applications in renewable energy power generation, smart grid, electric vehicles, aerospace and other fields. [0003] A traditional inverter only includes one DC input port and one AC output port, that is, it can only realize power conversion between one DC input source and one AC load or AC grid. However, in power systems such as renewable energy generation, smart grid, energy storage, etc., it is usually necessary to connect multiple DC input sources to the inverter. For example: in a distributed photovoltaic grid-connected power generation system, multiple distributed photovoltaic power sources need to be connected to the inverter; I...
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IPC IPC(8): H02M7/48
Inventor 吴红飞邢岩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS