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A grid-connected inverter system

A technology of inverter system and inverter bridge, which is applied in the direction of single-grid parallel feeding arrangement, photovoltaic power generation, relay, etc., can solve the problem of occupying a lot of controller resources and so on.

Active Publication Date: 2018-12-11
SUNGROW SHANGHAI CO LTD
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Problems solved by technology

[0005] The invention provides a grid-connected inverter system and a method for detecting the state of a grid-connected switchgear to solve the problem of occupying too many controller resources in the prior art

Method used

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  • A grid-connected inverter system
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  • A grid-connected inverter system

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Embodiment Construction

[0066] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0067] The invention provides a grid-connected inverter system to solve the problem of occupying too many controller resources in the prior art.

[0068] See Figure 2a and Figure 2b , the grid-connected inverter system includes: a controller (not shown in the figure), a voltage acquisition device (not shown in the figure), an inverter bridge, and an AC side filter circuit (such as Figure 2a and Figure 2b The first inductance L1, the second inductance L2 and the capacitance C1...

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Abstract

The invention provides a grid-connected inverter system, wherein the controller can judge whether the grid-connected switch device is faulty or not according to the output signal of the voltage acquisition device, thereby realizing the state detection of the switch of the grid-connected device. Moreover, each two of the four switches in the grid-connected switching device are controlled by the same control signal output by the controller, so that the occupation of the controller resources is reduced compared with the prior art, and the problems in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a grid-connected inverter system. Background technique [0002] According to the grid-connected standard requirements of the household single-phase grid-connected inverter in the prior art, the configuration of the grid-connected switch device is generally as follows: figure 1 As shown: 4 independent relays (SW1, SW2, SW3 and SW4) are set between the AC side filter circuit (first inductance L1, second inductance L2 and capacitor C) of the single-phase inverter and the power grid; , 2 relays SW1 and SW2 on the L line are connected in series, and 2 relays SW3 and SW4 on the N line are connected in series. [0003] The controller in the single-phase grid-connected inverter usually needs to control the on-off of 4 relays and each power switch tube in the single-phase inverter bridge, combined with the two collection voltages V1_sample and V2_sample, to realize the short-ci...

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Application Information

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IPC IPC(8): H02J3/38H01H47/00
CPCH02J3/38H01H47/002Y02E10/56
Inventor 张凤岗邓超李本强李克成郭晗张鹏
Owner SUNGROW SHANGHAI CO LTD
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