Voltage disturbance mitigation in Iraq's low voltage distribution system

Abstract

<p>Power distribution network in Iraq still suffers from significant problems regarding electricity distribution level. The most important problem is the disturbances that are occurring on lines voltages, which in turn, will negatively affect sensitive loads they feed on. Protection of these loads could be achieved efficiently and economically using the dynamic voltage restorer DVR when installed between the voltage source and load to inject required compensation voltage to the network during the disturbances period. The DVR mitigates these disturbances via restoring the load voltage to a pre-fault value within a few milliseconds. To control the DVR work, dq0 transformation concept and PID method with sinusoidal pulse-width modulation SPWM based converter had been used to correct the disturbances and thus enhance the power quality of the distribution network. The DVR performance was tested by MATLAB/Simulink with all kinds of expected voltage disturbances and results investigated the effectiveness of the proposed method.</p>

An improved method for efficient controlling of the dynamic voltage restorer to enhance the power quality in the distribution system

“…The gain and are selected to force goes to zero as > ||. Consequently, let the estimation of ̇ become the output of the following low pass filter (LPF) as in (3).…”

“…In practice, there are various methods reported to improve the power quality in the distribution network. One of the solutions is the utilization of the dynamic voltage restorer (DVR) to mitigate the harmonics and compensate for the voltage sag and swell during power system operation [2][3][4]. The DVR is utilized by controlling the voltage source connected in series between the loads and the grid.…”

Optimum control for dynamic voltage restorer based on particle swarm optimization algorithm

“…Fault condition disruptions can cause sensitive devices to fail or shut down, as well as an imbalanced high current that can blow fuses or trip breakers. Such faults may cost the client a lot of money, ranging from minor quality alterations to device damage and productivity delays [5]. Voltage quality concerns are extremely sensitive to susceptible loads access to the power supply.…”

Power losses evaluation in low voltage distribution network: a case study of 250 kVA, 11/0.416 kV substation

“…The system disturbance may work with voltage balance/symmetrical or unbalance/asymmetrical. Besides, distribution losses are classified into technical and non-technical losses [1], [2]. Technical losses represent the power dissipated in distribution transformers, distribution lines and metering devices while the non-technical losses are result of external factors such as theft of electricity, non-payment bills by consumers and errors in reading the energy meters and keeping data.…”