Inverter and startup method thereof

An inverter and soft-start technology, which is applied to the inverter with the DC side soft-start function and the field of start-up, to achieve the effects of simplifying start-up logic, reducing grid impact, and reducing current impact

Active Publication Date: 2012-07-04
SHENZHEN WINLINE TECH
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  • Abstract
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Problems solved by technology

[0004] On the other hand, during the reverse inverter process of soft start on the AC side, due to the influence of the modulation ratio and the voltage drop of the soft start resistor, the AC volt

Method used

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  • Inverter and startup method thereof
  • Inverter and startup method thereof

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Embodiment Construction

[0024] The present invention will be further understood through the following description of the embodiments with reference to the above-mentioned drawings.

[0025] figure 1 is a schematic diagram showing an inverter adopting an inverter DC side soft start device 110 according to an embodiment of the present invention. Such as figure 1 As shown, the inverter is, for example, a photovoltaic grid-connected inverter, which mainly includes sequentially cascaded DC side switches 20, bus capacitor components 30, power modules 40, output filter components 50, grid-connected contactors 60, and an AC circuit breaker 70 . The DC side switch 20 is connected to the battery (DC side input) 10 , and the AC circuit breaker 70 is connected to the grid 80 .

[0026] The inverter also includes a soft start device 110, which is connected in parallel with the cascade circuit composed of the DC side switch 20 and the bus capacitor assembly 30, that is, the input and output sides of the soft st...

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Abstract

The invention relates to an inverter and a startup method thereof. The inverter comprises a direct-current side switch (20), a bus capacitor assembly (30), a power module (40), an output filter assembly (50), a grid-connected contactor (60) and an alternating-current breaker (70) which are connected in sequence in a cascaded manner, wherein the direct-current side switch (20) is connected to a direct-current side input (10), and the alternating-current breaker (70) is connected to a power grid (80); and the inverter further comprises a soft startup device (110), wherein the input side and the output side of the soft startup device (110) are respectively connected with the direct-current side input (10) and the power module (4). According to the startup method of the inverter, because direct-current side soft startup is adopted, the startup logic can be simplified, redundancy can be reduced, current impact on a bus capacitor and an alternating-current output filter capacitor, and impact on the power grid are reduced, and thus all pieces of equipment of the inverter system can be protected.

Description

technical field [0001] The invention relates to the technical field of inverters, in particular to an inverter with a DC side soft start function (for example, a photovoltaic grid-connected inverter) and a start-up method thereof. Background technique [0002] In the application of high-power photovoltaic inverters and energy storage inverters, a large number of DC bus capacitors and AC output filter capacitors are used. In order to reduce the current impact on the grid and capacitors at the moment of startup, a series resistor is generally used to limit the current of the soft start. (referred to as "soft start") method. [0003] At present, the soft start method mainly adopts the soft start on the AC side of the power grid, so the start-up logic of the inverter is relatively complicated. After the AC side is soft-started and connected to the grid, it is necessary to modulate the boost to increase the bus voltage to a level close to the battery voltage before closing the D...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02M1/36
Inventor 韦启航
Owner SHENZHEN WINLINE TECH
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