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Five-level single phase photovoltaic gird-connected inverter

A five-level, inverter technology, applied in photovoltaic power generation, electrical components, single-network parallel feeding arrangements, etc., can solve the problems of complex circuit structure and large loss of solar inverters, and achieve low power consumption and high current The effect of small harmonics and simple control

Inactive Publication Date: 2014-03-12
NINGBO GREENTECH ENERGY SAVING TECH
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Problems solved by technology

[0004] In order to solve the problems of complex circuit structure and high loss in existing solar inverters, the present invention proposes a five-level single-phase photovoltaic grid-connected inverter, which has a small number of power switches and a simple structure, reducing the inverter Relying on the controller can improve the stability of the entire system, reduce the energy consumption of the inverter itself, effectively reduce the volume of the radiator, and increase the overall efficiency of the inverter

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0023] Such as figure 1 As shown, a five-level single-phase photovoltaic grid-connected inverter includes an AC access port J1, a reactor L1, a power switch circuit, a first photovoltaic cell module 1, a second photovoltaic cell module 2, a first photovoltaic cell Both the module 1 and the second photovoltaic cell module 2 have a positive terminal and a negative terminal, the AC access port J1 has a terminal a and a terminal b, and the reactor L1 is a smoothing reactor, which is used to connect the power switch circuit and the AC power grid . The power switch circuit includes a power switch Q1, a power switch Q2, a power switch Q3, a power switch Q4, a power switch Q5 and a power switch Q6, all of which are IGBT elements.

[0024] A diode D1 and a filter capacitor C4 are connected between the reactor L1 and the AC port, the anode of the diod...

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Abstract

The invention provides a five-level single phase photovoltaic gird-connected inverter, which comprises an alternating current access port, an electric reactor, a power switch circuit, a first photovoltaic battery module and a second photovoltaic battery module, wherein the alternating current access port is provided with an end a and an end b, the power switch circuit comprises eight power switches, the first photovoltaic battery module and the second photovoltaic battery module are respectively provided with a positive end and a negative end, one end of the electric reactor is connected with the end a of the alternating current port, and the other end of the electric reactor and the end b of the alternating current port are respectively and electrically connected with the power switch circuit. The five-level single phase photovoltaic gird-connected inverter has the advantages that the power switches are few, the structure is simple, the dependence of the inverter on a controller is reduced, the stability of the whole system can be improved, in the practical application, the switching stress of each switch is smaller, the self energy consumption of the inverter can be reduced, the size of a heat radiator is effectively reduced, and the overall benefits of the inverter are increased.

Description

technical field [0001] The invention relates to an inverter, in particular to a five-level single-phase photovoltaic grid-connected inverter. Background technique [0002] With the advancement and recognition of science and technology, countries all over the world have to face the problem of energy scarcity. The main application of solar energy is to use the electric energy generated by photovoltaic cells and transmit it to the grid through a grid-connected inverter. After 2009, the solar grid-connected inverter industry began to recover. At the same time, the expansion of polysilicon production scale is conducive to the exponential reduction of solar energy, and the switching devices and control technology of inverters are gradually mature, which further promotes the development of solar energy. The overall development of grid-connected technology. The solar grid-connected inverter is to feed back the direct current generated by the solar cell to the grid through the inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02J3/38
CPCY02E10/563Y02E10/56
Inventor 曾繁鹏夏抒
Owner NINGBO GREENTECH ENERGY SAVING TECH
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