Inverter type distributed power source power-frequency hysteresis island detection method

An inverter-type distributed and island detection technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem that the micro-grid island detection is no longer applicable, and achieve the effect of reducing the time and frequency of power outages

Inactive Publication Date: 2016-01-06
STATE GRID TIANJIN ELECTRIC POWER +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For the purpose of not destroying the island state, most of the current active detection methods are no longer applicable to the island detection of microgrids.

Method used

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  • Inverter type distributed power source power-frequency hysteresis island detection method
  • Inverter type distributed power source power-frequency hysteresis island detection method
  • Inverter type distributed power source power-frequency hysteresis island detection method

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Embodiment Construction

[0023] The method for islanding detection of power-frequency hysteresis of an inverter-type distributed power supply provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 As shown, the topological diagram of the main circuit of the islanding test device used in the method for detecting the islanding of the inverter type distributed power supply frequency hysteresis loop provided by the present invention is as follows: figure 1 As shown, the island detection device is installed on the grid-connected inverter of the inverter-type distributed power supply. The inverter-type distributed power supply is connected to the power grid at the point of public coupling (PCC point) and a frequency sensor is installed. Connect with equivalent load.

[0025] First, the inverter control strategy of the inverter-type distributed power supply is modified, and the reactive power outpu...

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Abstract

An inverter type distributed power source power-frequency hysteresis island detection method comprises the steps of judging the frequency range, judging the angular frequency range, making frequency control be negative feedback, calculating the reactive power, judging the number of times that the frequency is beyond the threshold value, making frequency control be positive feedback, calculating the reactive power, confirming island generation, and the like. The method has the effects as follows: through constant change in power-frequency positive and negative feedback control, the operation state of an island is not destroyed, and the generation of an island can be detected quickly; the method has positive significance in transforming an unintentional island into an intentional island when there is an unintentional island in a micro power grid; and for internal power users of the micro power grid, the outage time and frequency can be reduced, the yield can be increased, and the quality can be ensured.

Description

technical field [0001] The invention belongs to the technical field of island detection of micro-grids or inverter-type distributed power supplies, and in particular relates to a method for detecting islands of power-frequency hysteresis loops of inverter-type distributed power supplies. Background technique [0002] With the development of microgrids and the massive access of distributed power sources, the possibility of isolated islands is increasing. Since unplanned isolated islands will have many adverse effects on users and systems, based on the consideration of power supply safety and reliability, anti-islanding Protection is required. The basis of anti-islanding protection is islanding detection. Islanding detection is the premise for the microgrid to move from an unplanned island to a planned island, and it also plays an important role in changing the control strategy and protection configuration in the microgrid. [0003] The existing islanding detection methods ar...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor李盛伟韩晓罡马力王楠范须露王梦
OwnerSTATE GRID TIANJIN ELECTRIC POWER