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An Island Detection Method Based on System Simulation

A technology of island detection and system simulation, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of long active detection time and influence on power quality, so as to reduce the detection blind area, increase reliability, and promote high effect of value

Active Publication Date: 2021-06-29
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Active detection takes a long time and affects power quality

Method used

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  • An Island Detection Method Based on System Simulation
  • An Island Detection Method Based on System Simulation
  • An Island Detection Method Based on System Simulation

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Experimental program
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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Step 1. Obtain the network topology diagram inside the photovoltaic grid-connected system, and establish a simulation model with actual load parameters.

[0022] In order to ensure that the simulation results are closest to the actual situation, the simulation model is established with the actual load parameters of the photovoltaic grid-connected system as the model parameters. The above parameters can be obtained from the network topology inside the photovoltaic grid-connected system. The simulation system can use simulink, PSASP, PSS / E, PSD-BPA, EMPT / APT and other power system simulation software or hardware devices. In this embodiment, simulink is selected because the simulink software is highly portable, easy to convert to C language and other languages, applied to protection equipment, and has relatively low hardware requirements.

[0023] The main factor...

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Abstract

A system simulation-based islanding detection method belongs to the field of power system protection and control, and in particular relates to a method for detecting the operating state of a photovoltaic grid-connected system through simulation. Establish a simulation model with load parameters; perform simulation and calculate the simulated voltage harmonic content; obtain the voltage harmonic content of the PCC of the photovoltaic grid-connected point; compare the voltage harmonic content obtained by the simulation with the actually obtained voltage harmonic content, and determine the The operating status of the network system. The invention combines harmonic detection and system simulation in a detection mode, not only simply judging the harmonic content, but comparing the actual harmonic content with real-time simulation results, which greatly reduces the detection blind spot.

Description

technical field [0001] The invention belongs to the field of power system protection and control, in particular to a method for detecting the running state of a photovoltaic grid-connected system through simulation. Background technique [0002] With the continuous increase of photovoltaic power plants connected to the grid, a series of problems have been brought to the operation protection and control of the grid, and the island effect is one of the most serious problems. As a special fault state, the island effect is defined as: after the public power grid stops supplying power due to faults, maintenance or other reasons, the photovoltaic grid-connected system fails to know the power-off state of the system in time, and still outputs electric energy to the regional loads, eventually forming a Islands operating with local loads that are not controlled by the grid. The public power grid trips due to accidental factors such as power outage maintenance and misoperation. The p...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38G01R31/08
CPCG01R31/086G01R31/088Y02E10/56
Inventor 庞博尹兆磊袁绍军孙文宇刘驰白明辉苗宏佳席海阔冯浩
Owner STATE GRID CORP OF CHINA