Effects of Current Injection for Active Islanding Detection on Power Quality
Date Issued
2009
Date
2009
Author(s)
Lin, Sheng-Wei
Abstract
Distributed resources(DR) systems have been broadly used as a result of the increased demand for electricity and the requirement to reduce the impact on the environment from tradition fossil fuel of power production. Many of the DR systems make use of renewable energy such as wind power, photovoltaic cell, or fuel cell. When the DR systems are operated in parallel with utility power systems, the power quality problems are significant. Power quality problems include frequency deviation, voltage fluctuation, harmonics, etc. In addition, islanding operation is one important topics. Islanding is the continued operation of the DR when the grid has been removed on purpose, by accident, or by damage. he islanding operation should be avoided because of safety reasons for maintenance man and electrical facilities. Islanding detection methods may be divided into two categories: passive methods and active methods. The current injection method is one of the active methods. The method is based on injecting a disturbance signal into the system through either the direct axis or the quadrature axis current controllers of the voltage-sourced converter. The disturbance signal causes voltage fluctuation or frequency deviation at the point of common coupling(PCC) under islanded conditions. However, injecting a disturbance into the system may result in the loss of power quality. simulation platform by software MATLAB/Simulink has been implemented in this thesis, which is used to analyze the effect on the power quality in order to find the appropriate range of the injected disturbance signal.
Subjects
grid-connected
Inverter
Islanding detection
Distributed Resources
SDGs
Type
thesis
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