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Distributed inversion system and starting method thereof

An inverter system, a distributed technology, applied in the direction of converting irreversible DC power input to AC power output, photovoltaic power generation, AC network circuits, etc., can solve the problem of large inrush current of capacitors

Active Publication Date: 2016-08-03
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a distributed inverter system and its starting method to solve the problem in the prior art that the inrush current on the capacitor is relatively large when the inverter is started

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  • Distributed inversion system and starting method thereof
  • Distributed inversion system and starting method thereof
  • Distributed inversion system and starting method thereof

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Embodiment Construction

[0047] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0048] The invention provides a start-up method of a distributed inverter system to solve the problem in the prior art that the inrush current to the AC / DC capacitor is relatively large when the inverter starts up.

[0049] Specifically, the starting method of the distributed inverter system is applied to the distributed inverter system, and the distributed inverter system is such as figure 1 As shown, it includes: an inverter and N power optimizers whose output ends are connected in parallel to the input end of the inverter; wherein, the inverter and the N power optimizers include independent controllers, and N is a positive integer ; The starting method of the distributed inverter system is as figure 2 shown, including:

[0050] S10...

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Abstract

The invention discloses a distributed inversion system and a starting method thereof. An inverter of the distributed inversion system determines whether the system satisfies a preset starting condition; when the distributed inversion system satisfies the preset starting condition, the inverter communicates with N power optimizers of independent control, so that all the power optimizers are notified to start in the output voltage source mode; when the inverter determines that the voltage of a DC bus satisfies a first preset soft start condition, the inverter is started softly and establishes an inversion voltage; and when the inverter determines that the inversion voltage satisfies a second preset soft start condition, an AC contactor is closed. The first and second preset soft start conditions are determined to ensure that the voltage between the two ends of the inverter satisfies the soft start conditions before the inverter is started, and solve the problem that impact current of AC / DC capacitors is too high when the inverter is started under the condition that the voltage of the DC bus is too low.

Description

technical field [0001] The invention relates to the technical field of distributed inverter systems, in particular to a distributed inverter system and a starting method thereof. Background technique [0002] In the field of photovoltaic power generation, the distributed inverter system combines the advantages of string and centralized inverters, which can significantly improve the power generation of distributed power plants. Its system consists of figure 1 As shown, a 1MW square array includes a 1MW centralized inverter, a step-up transformer connected to the grid, N boost power optimizers controlled independently of each other, and multiple battery panels, where N is a positive integer. [0003] exist figure 1 In the system shown, the DC bus voltage (eg 820V) and the AC grid voltage (eg 540V) of the inverter are often set relatively high. In this case, when the inverter is started, when the DC bus voltage is low, the AC contactor of the inverter is closed, and the AC f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M7/42
CPCH02J3/383H02M7/42Y02E10/56
Inventor 梁城潘年安陶磊
Owner SUNGROW POWER SUPPLY CO LTD
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