Islanding detection system and method for inverter power source

A technology of inverter power supply and islanding, which is applied in the field of power electronic devices and its control, and can solve problems such as affecting power quality and large detection blind spots

Active Publication Date: 2015-03-25
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide an inverter power supply, an island detection system and method ...

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  • Islanding detection system and method for inverter power source
  • Islanding detection system and method for inverter power source
  • Islanding detection system and method for inverter power source

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Embodiment Construction

[0060] 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.

[0061] see figure 1 , which shows an inverter power supply provided by an embodiment of the present invention, the inverter power supply includes: a measurement circuit 11, a signal input module 12, an adaptive control module 13, a dual feedback decoupling control module 14, an output drive Module 15 and VSC main circuit 16, wherein:

[0062] The measuring circuit 11 is used to determine the first voltage and the first current output by the inverter power sup...

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Abstract

The invention discloses an islanding detection system and method for an inverter power source. The method mainly comprises the steps that first voltage and first currents output by the inverter power source are determined; according to the first voltage and the first currents, a control mode and an on-off control signal corresponding to the control mode are determined; a VSC main circuit determines the on-off state of the main circuit according to the on-off control signal and outputs the electricity quantity corresponding to the control mode, and the electricity quantity comprises the voltage and the currents; an islanding protecting device obtains output currents and output voltage and then judges whether the inverter power source is in an islanding state. According to the method, the first voltage and the first currents are processed in a series mode to determine the control mode of the inverter power source, whether the inverter power source is in the islanding state is judged by judging the voltage and the currents output to the main circuit and a second bus under the current control mode, detection blind areas are avoided, the voltage and the currents output by the inverter power source are adjusted through different control modes, and therefore the electric energy quality is not influenced.

Description

technical field [0001] The invention relates to the technical field of power electronic devices and their control, and more specifically, to an inverter power supply, an islanding detection system and a method. Background technique [0002] Conventional grids have grown rapidly over the past few decades as demand for electricity continues to grow. However, due to its high cost, difficult operation, fuel shortage, and increasing environmental pollution, the development of environmentally friendly, flexible, and renewable energy-based distributed power generation technologies has been promoted. Distributed Generation (DG) is generally connected to the grid through an inverter power supply, so it is called an inverter power supply. [0003] However, when the power grid stops working due to system failure or power outage maintenance, the grid-connected power generation system may not be able to detect the power outage in time and cannot quickly disconnect itself from the power ...

Claims

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Application Information

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IPC IPC(8): H02J3/38G01R31/00
CPCG01R31/00H02J3/38H02J3/388
Inventor 张雪松赵波周丹吴恒许健吉小鹏
Owner STATE GRID CORP OF CHINA
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