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Alternating current optimizer system

An optimizer and controller technology, applied in AC network circuits, photovoltaic power generation, electrical components, etc., can solve the problems of high overall cost of photovoltaic power generation systems and complex control of H-bridge cascaded systems

Inactive Publication Date: 2018-11-27
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

The greater the number of dummy modules, the higher the overall cost of the photovoltaic power generation system, and the control of the H-bridge cascaded system with voltage regulation modules is more complicated

Method used

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Embodiment Construction

[0041] It can be seen from the background technology that in order to improve the conversion efficiency of photovoltaic modules in traditional photovoltaic power generation systems, photovoltaic modules can also be cascaded through H-bridges, and the cascaded voltage can be processed by multiple voltage regulation modules (Dummy modules). In order to make the cascaded voltage meet the requirements of the grid voltage, such as figure 2 shown.

[0042] Yet the inventor finds that there are following technical problems in this scheme:

[0043] 1. The H-bridge inverter unit is a step-down topology, and the low-voltage power grid generally has a wide range. For example, the grid-connected voltage specification of a general household inverter is 180V-276V, and measures must be taken to balance or buffer the grid voltage. In addition, the range of sunlight changes greatly every day, and measures are needed to offset the impact of lighting changes on the component voltage. Relying o...

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Abstract

The invention provides an alternating current optimizer system, which comprises a photovoltaic assembly, an alternating current optimizer and a grid-connection control cabinet, wherein the alternatingcurrent optimizer comprises a voltage booster circuit and inversion circuits; the grid-connection control cabinet transmits electric network information to the alternating current optimizer; the alternating current optimizer is switched between a first mode and a second mode on the basis of the electric network information and the electric energy information of the alternating current optimizer.In the first mode, the voltage booster circuit is controlled to realize a direct connection state; the inversion circuits are controlled to perform MPPT tracking and inversion function on the photovoltaic assembly; at the moment, the voltage booster circuit is in the direct connection state, a plurality of inversion circuits are in cascade connection; the primary topology is realized; the system inversion efficiency can be improved. In the second mode, the voltage booster circuit is controlled to perform MPPT tracking on the photovoltaic assembly; the inversion circuits are controlled to perform inversion on the photovoltaic assembly; the regulation is performed on the photovoltaic assembly through the voltage booster circuits, so that the system can realize the normal operation; the use rate of the system is improved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to an AC optimizer system. Background technique [0002] With the rapid development of photovoltaic power generation, the requirements for the power generation efficiency of photovoltaic modules are gradually increasing. Usually, such as figure 1 As shown, in order to improve the power generation efficiency of photovoltaic modules, a DC optimizer can be connected in parallel to the photovoltaic modules, and the series-connected DC optimizer can be connected in parallel to the inverter, and the inverter converts direct current into alternating current to realize grid connection. However, the switching frequency of the inverter is high, and its conversion efficiency is low, resulting in low conversion efficiency of the entire photovoltaic power generation system. [0003] In addition, the conversion efficiency of the photovoltaic power generation system can als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/385Y02E10/56
Inventor 谷雨徐君江才
Owner SUNGROW POWER SUPPLY CO LTD
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