Abstract
Voltage sag is considered to be the most serious problem of power quality. It is caused by faults in the power system or by the starting of large induction motors. Voltage sag causes about 80% of the power quality problems in power systems. One of the main reasons for voltage sag is short circuit fault, which can be compensated for by a distribution static compensator (DSTATCOM) as an efficient and economical flexible AC transmission system (FACTS) device. In this paper, compensation of this voltage sag using DSTATCOM is reviewed, in which a sliding mode control (SMC) technique is employed. The results of this control system are compared with a P+Resonant control system. It will be shown that this control system is able to compensate the voltage sag over a broader range compared to other common control systems. Simulation results are obtained using PSCAD/EMTDC software and compared to that of a similar method.
Highlights
In recent years, by granting the power industries to the private sector, and high demand for this kind of energy, the power companies—in order to prove their competence—are trying to provide high quality power to consumers [1,2]
According to IEEE 1159–1995 standard, voltage sag or temporary loss of voltage is defined as a reduction of root mean square (RMS) voltage to a value between 0.1 and 0.9 per unit at the power frequency for the duration of a half-cycle to 1 minute, where the interruption is a short time deviation and the total voltage loss (
To determine the voltage sag domain in radial distribution networks, a voltage division model is used where Zs is the source impedance in the point of common coupling (PCC) and Zf is the impedance between PCC and fault location
Summary
By granting the power industries to the private sector, and high demand for this kind of energy, the power companies—in order to prove their competence—are trying to provide high quality power to consumers [1,2]. The conventional methods for decreasing voltage sag include using capacitor banks, installing new parallel feeders, and uninterruptible power supplies (UPS). Applying such methods cannot completely solve the problems of power quality. Electronics 2016, 5, 41 compensator (DSTATCOM) is an important member of this family that is used to improve power quality [17]. This three-phase compensator is installed near and in parallel with sensitive loads of distribution systems, and is generally used to compensate the voltage sag. The results of this control system are compared with a P+Resonant control system (P+Resonant control system is an improved PI controller)
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