Simulation-based Analysis of a Dynamic Voltage Restorer under Different Voltage Sags with the Utilization of a PI Controller

Abstract

Power quality problems are becoming a major issue. Every utility company consumer desires to receive steady-state voltage, i.e. a sinusoidal waveform of constant frequency as generated at power stations, but the influence of disturbances in the shape of sags and swells, interruptions, transients and harmonic distortions which affect power quality, resulting in loss of data, damaged equipment, and augmented cost. The most powerful voltage disturbance is the sag voltage. In this paper, a Dynamic Voltage Restorer (DVR) is proposed for sag voltage compensation. It is cost-effective and protects critical loads in a good manner from balanced or unbalanced sag voltage. Control strategy (such as a PI controller) is adopted with DVR topology and the performance of such a device with the proposed controller is analyzed through simulation in MATLAB/Simulink. Three types of faults are utilized, which are available in MATLAB/Simulink pack, for obtaining the sag voltage. The specific range of total harmonic distortion percentage is also discussed. After the result validation of the DVR topology in MATLAB/Simulink, it has been seen that the proposed topology is able to compensate the sag voltage of any type of fault and reduce the unbalancing and voltage distortions of the grid.

Boost Converter Based 3-phase AC-AC Active Tracking Voltage Regulator Controlled by a Robust Hybrid Control Method

“…The above shown dynamic analysis is performed for the positive half-wave input case, as mentioned previously. A similar dynamic analysis for the negative half-wave input case provides the same state-space equations given in ( 5) and (6). Thus, this means that the state-space equations obtained in ( 5) and ( 6) are valid for all input cases.…”

“…Voltage sags or voltage swells occur due to the various operating regulation for voltage variations in distribution systems. For this aim, voltage sag supporters [1,2], voltage sag/swell compensators [3,4], DVRs (dynamic voltage restorers) [5,6], and voltage conditioners [7,8], are developed and applied successfully. The desired distribution network voltage is provided by these devices to the distribution buses where the AC loads are connected.…”

Voltage Regulation in a Radial Microgrid with High RES Penetration

“…There are numerous devices reported in the literature that can be used to regulate voltage in the distribution system, including Dynamic Voltage Restorers (DVRs), Static Synchronous Compensators (STATCOMs), etc. [9][10][11][12]. A DVR is a custom power device that is connected in series with the line and injects/absorbs a series voltage.…”

Classification of Voltage Sag Propagation under Double Line to Ground Fault on a Low Voltage Distribution Power Network

“…Power Quality (PQ) is an important issue in electrical systems [1]. Due to the existence of symmetric faults in the transformer windings, the sinking of the distribution network will deviate from the waveform of the power supply voltage, which depends on the nominal sine waveform and the nominal frequency [2,3].…”