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System and method for voltage-free sampling coordination control for multi-grid-connected inverter

A technology of coordinated control system and control method, which is applied in the direction of AC network circuits, photovoltaic power generation, electrical components, etc., can solve problems such as coordinated control without voltage sensors, and achieve the goal of increasing consistency, reducing costs, and improving response characteristics Effect

Active Publication Date: 2018-07-27
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent does not mention how to use the existing communication channel for coordinated control of voltage-free sensors

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  • System and method for voltage-free sampling coordination control for multi-grid-connected inverter
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  • System and method for voltage-free sampling coordination control for multi-grid-connected inverter

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Embodiment Construction

[0054] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0055] It should be pointed out that the following detailed descriptions are all illustrative and are intended to provide further explanations for the application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0056] It should be noted that the terms used here are only for describing specific implementations, and are not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate There are features, steps, operation...

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Abstract

The invention discloses a system and method for voltage-free sampling coordinated control for a multi-grid-connected inverter. The system comprises a plurality of grid-connected inverters and a network voltage collecting device, an input end of each grid-connected inverter is connected to a power generating unit, an output end of each grid-connected inverter is connected to a power grid through acommon grid connection point, each grid-connected inverter is connected to a communication line, the network voltage collecting device is arranged on one of the grid-connected inverters, the grid-connected inverter collects network voltage information through the network voltage collecting device, shares the network voltage information to the other grid-connected inverters through the communication line, and the other grid-connected inverters achieve the grid-connected operation of a voltage-free sensor by using the received shared network voltage information and voltage, current and power information which are collected locally.

Description

Technical field [0001] The invention relates to a non-voltage sampling coordinated control system and method for multiple grid-connected inverters. Background technique [0002] With the continuous development of renewable energy power generation technology, the installed capacity of renewable energy continues to increase. Grid-connected inverters are key equipment for connecting photovoltaic panels and wind generators to the grid. Large-scale renewable energy power generation systems represented by centralized photovoltaic power plants and wind farms need to be equipped with a large number of grid-connected inverters. [0003] Grid-connected inverters need to obtain accurate grid voltage amplitude, phase angle and frequency information during grid-connected operation to ensure that the inverter inputs active power to the grid under normal grid operation conditions or provides reactive power when the grid voltage drops support. Traditional methods mostly use grid voltage samplin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M1/088
CPCH02J3/385H02M1/088H02M7/493H02M1/12H02J3/38H02J3/40H02J2300/24Y02E10/56
Inventor 高峰许涛
Owner SHANDONG UNIV
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