Design of Controller Parameters for Static Synchronous Compensators
Date Issued
2008
Date
2008
Author(s)
Liang, Quo-Tang
Abstract
To decrease the CO2 emission and relieve global warming effect, renewable energy such as solar energy, wind energy, biofuel, geothermal power, Kuroshio current(Black Tide) energy, etc, received much attention in recent years. These unconventional power sources may have great impact on the whole power system. So how to improve system stability and maintain good power quality will be of major concern to power engineers around the world. In a power system, a static synchronous compensator(STATCOM), which is capable of delivering or absorbing reactive power, not only improves power factor and voltage regulation, but also reduces line losses and enhances system stability. In the thesis, a STATCOM will be designed to regulate bus voltages when the power system is subject to disturbances. The STATCOM employs a direct current capacitor to offer the voltage source and uses the pulse width modulation technology to control the reactive power delivered or absorbed by the STATCOM in order to achieve bus voltage regulation. In the design of a STATCOM, it is important to determine proper gains for the PI controller. Root locus techniques and pole assignment methods are used to determine proper gains for the PI controller such that the STATCOM has fast response and good stability. The effectiveness of the designed STATCOM is investigated by digital simulations using the Simulink of MATLAB software. The experiments are conducted on a scaled-down distribution system. The control system is based on a personal computer. Hall sensors are employed to measure voltage and current signals through data acquisition cards which converts analog signals to digital ones. Finally, the computer calculates the desired compensation voltage through program language Turbo C to produce driving signals which drive converters to achieve bus voltage compensation.
Subjects
static synchronous compensator
pulse width modulation
root locus
pole assignment
converter
SDGs
Type
thesis
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