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Distributed photovoltaic inverter system and power-limiting control method thereof

A photovoltaic inverter and control method technology, applied in photovoltaic power generation, AC network circuits, electrical components, etc., can solve problems such as the inability to limit the total output power of the inverter system

Active Publication Date: 2016-10-12
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention provides a distributed photovoltaic inverter system and its power limiting control method to solve the problem that the existing technology cannot limit the total output power of the entire inverter system

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  • Distributed photovoltaic inverter system and power-limiting control method thereof

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Embodiment Construction

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0045] The invention provides a power-limiting control method of a distributed photovoltaic inverter system to solve the problem that the prior art cannot limit the total output power of the entire inverter system.

[0046] Specifically, the power-limiting control method of the distributed photovoltaic inverter system is applied to the distributed photovoltaic inverter system, and the distributed photovoltaic inverter system includes: an inverter and N independ...

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Abstract

The application provides a distributed photovoltaic inverter system and a power-limiting control method thereof. An inverter generates and outputs a power difference value according to a preset power limit value and a grid-connected main power obtained by real-time collection; and when the power difference value meets a preset power-limiting condition, power adjusting modules in N independent power optimizers adjust PV voltages at respective input sides synchronously until the power difference value does not meet the preset power-limiting condition. Therefore, power-limiting control of the distributed photovoltaic inverter system is realized without the need to limit the grid-connected current of the inverter. Besides, because the PV voltages at respective input sides of all power optimizers are adjusted synchronously until the power difference value does not meet the preset power-limiting condition, the output limiting on the total output power of the whole inverter system is realized, so that problems in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of power conversion, in particular to a distributed photovoltaic inverter system and a power-limiting control method thereof. Background technique [0002] The distributed photovoltaic inverter system combines the advantages of string and centralized inverters, and can significantly improve the power generation of distributed power plants. Its system consists of figure 1 As shown, the 1MW square array includes a 1MW centralized inverter, N power optimizers controlled independently of each other, and a step-up transformer; N is a positive integer. [0003] In this system, the inverter in the latter stage works in the DC voltage stabilization mode, and the N power optimizers in the preceding stage complete MPPT (Maximum Power Point Tracking, maximum power point tracking) search work. In other words, the grid-connected power of this system is determined by the N power optimizers at the previous stage. Theref...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/383Y02E10/56
Inventor 梁城潘年安陶磊
Owner SUNGROW POWER SUPPLY CO LTD
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