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Parallel control system and method of modularized photovoltaic grid-connected inverter

A control system and inverter technology, applied in the direction of photovoltaic power generation, single-net parallel feeding arrangement, etc., can solve the problems of inverter module current sharing, maximum power tracking island protection consistency, etc., to avoid tracking inaccuracies Synchronization, prevent the effect of disturbance out of synchronization

Inactive Publication Date: 2014-07-23
YUNGU ENERGY MANAGEMENT SHENZHEN CO LTD
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Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a parallel control system for modular photovoltaic grid-connected inverters, which aims to solve the problem that current modular photovoltaic grid-connected inverter control systems cannot solve the problem of current sharing between inverter modules, Issues with Maximum Power Tracking and Islanding Consistency

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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0036] figure 2 The structure of the parallel control system of the modular photovoltaic grid-connected inverter provided by the embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown.

[0037] A modular photovoltaic grid-connected inverter parallel control system 1 is connected to a solar photovoltaic array 2 and an inverter module 3 respectively. The modular photovoltaic grid-connected inverter parallel control system 1 includes:

[0038] the first control unit 101;

[0039] The second contro...

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Abstract

The invention belongs to the field of photovoltaic grid-connected power generation, and particularly relates to a parallel control system and method of a modularized photovoltaic grid-connected inverter. The parallel control system of the modularized photovoltaic grid-connected inverter can well track the maximum power of a solar photovoltaic array, the problem that tracking of inverter modules is not synchronous is avoided, similarly, a first control unit sends a current reference value to second control units in a unified mode, the second control units control the inverter modules to output current, and therefore uniform current between the inverter modules is achieved; in addition, the first control unit sends the frequency disturbance quantity and the frequency disturbance direction to the second control units in a unified mode, and therefore the phenomenon that disturbance between the inverter modules is not synchronous can be avoided.

Description

technical field [0001] The invention belongs to the field of photovoltaic grid-connected power generation, and in particular relates to a parallel control system and method for modularized photovoltaic grid-connected inverters. Background technique [0002] At present, with the increasing tension of traditional energy sources, the development of new energy sources has been paid more and more attention. As an inexhaustible clean energy source, solar energy has been favored by various countries. With the development of power electronics technology, solar photovoltaic inverters have developed rapidly, and have formed a considerable scale all over the world. [0003] At present, there are two types of photovoltaic grid-connected inverters on the market: integrated and modular, among which modular photovoltaic inverters are small in size, low in cost and easy to maintain. [0004] figure 1 It is a modular photovoltaic grid-connected inverter structure, including one or more par...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/42
CPCH02J3/38H02J3/42Y02E10/56
Inventor 司徒琴翦志强
Owner YUNGU ENERGY MANAGEMENT SHENZHEN CO LTD
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