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A modular photovoltaic grid-connected inverter parallel control system and method

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

Inactive Publication Date: 2016-05-18
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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  • A modular photovoltaic grid-connected inverter parallel control system and method
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  • A modular photovoltaic grid-connected inverter parallel control system and method

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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

A parallel control system and method for a modular photovoltaic grid-connected inverter. A parallel control system (1) for a modular photovoltaic grid-connected inverter can well track the maximum power of a solar photovoltaic array (2), thereby avoiding the problem of non-synchronization of tracking among inverter modules (3). Similarly, a first control unit (101) uniformly sends current reference values to second control units (102), and the second control units control the inverter modules to output currents, thereby realizing the current equalization among the inverter modules, and the first control unit uniformly sends a frequency disturbance quantity and a frequency disturbance direction to the second control units, so that the problem of non-synchronization of disturbance among the inverter modules can be prevented.

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...

Claims

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Application Information

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Patent Type & Authority Patents(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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