A pre-charging circuit, inverter and power generation system
A pre-charging circuit and inverter technology, which is applied in battery circuit devices, flexible AC transmission systems, photovoltaic power generation, etc., can solve the problems of high cost and complex pre-charging circuit structure, achieve small changes, avoid current impact, and circuit The effect of simple structure
Active Publication Date: 2021-06-01
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology
[0003] When the photovoltaic inverter is running in SVG mode, it is necessary to pre-charge the bus capacitor to avoid current impact due to the large voltage difference between the DC bus voltage and the peak voltage of the grid at the moment of grid connection. The current pre-charging circuit has a complex structure ,higher cost
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Embodiment Construction
[0033] The embodiment of the present application provides a pre-charging circuit to avoid current impact caused by a large voltage difference between the DC bus voltage and the grid voltage peak value at the moment of grid connection. The embodiment of the present application also provides a corresponding inverter and a power generation system.
[0034] Each will be described in detail below.
[0035] 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 those skilled in the art without making creative efforts belong to the scope of protection of this application.
[0036]The traditional power system needs to consume a large amount of non-renewable resources such a...
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The present application discloses a pre-charging circuit, including: a first switch, a second switch, a diode, a first current limiting device, a capacitor, and an inverter unit. One end of the pre-charging circuit is connected to the power grid, wherein the first current limiting device, After the first switch is connected in series with the diode, one end is connected to one end of the capacitor, the other end is connected to the first-phase alternating current of the grid, and the other end of the capacitor is sequentially connected to the second-phase alternating current of the grid through the inverter unit and the second switch. After the first switch and the second switch are closed, the current output by the grid passes through the closed loop formed by the first current limiting device, the first switch, the diode, the capacitor, the inverter unit and the second switch to charge the capacitor. The present application provides a circuit for precharging bus capacitors, which has a simple structure, requires little modification on the basis of the existing inverter system, and saves costs.
Description
technical field [0001] The present application relates to the technical field of photovoltaic power generation, in particular to a pre-charging circuit. Background technique [0002] The photovoltaic inverter is an energy conversion device in the photovoltaic power generation system, which is used to convert the direct current output by the photovoltaic cell into alternating current and then send it to the grid. The photovoltaic inverter is idle at night, but there is a need for reactive power compensation in the grid at night. In order to make full use of the photovoltaic inverter, the photovoltaic inverter can be used to supplement reactive power for the grid in real time at night, and realize the function of static var generator (static car generator, SVG) at night. [0003] When the photovoltaic inverter is running in SVG mode, it is necessary to pre-charge the bus capacitor to avoid current impact due to the large voltage difference between the DC bus voltage and the p...
Claims
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IPC IPC(8): H02M1/36H02J3/38
CPCH02M1/36H02M7/48H02M1/32H02J2300/22H02M7/125H02J3/381H02J2207/50Y02E10/56H02J2207/20H02J2300/24H02J7/35H02M7/44
Inventor 张彦忠叶海军姚晓锋
Owner HUAWEI DIGITAL POWER TECH CO LTD