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This paper presents a DC microgrid integrated dynamic voltage restorer (DVR) system to mitigate the grid voltage sag and swell. The DC source of the DVR is the DC microgrid, including the PV array and hybrid energy storage system consisting of lithium-ion battery and supercapacitor. Compared to the conventional DVR supplied by pure energy storages, the DC microgrid will prolong the operation the DVR...
This paper presents a single-phase dynamic voltage restorer (DVR) equipped with a high-frequency isolated soft-switching converter. The proposed DVR can maintain the load voltage stable and lower the harmonic distortion. Moreover, by using simple resonant units, all main switches are operated at zero-voltage-switching (ZVS) turn-on mode. Simultaneously, other auxiliary switches are operated at zero-current-switching...
In the literature, passive filters have been commonly used to mitigate the harmonic currents in industrial distribution systems because they are inexpensive, simple, and reliable. The aim of this paper is presenting different design methods for multiple-arm shunt passive filters based on various reactive power sharing approaches for an industrial distribution system of a petrochemical plant in Egypt...
One of the most popular issues in the power distribution is the quality improvement due to the increased usage of power electronic based loads. This paper analyse the performance of Unified Power Quality Conditioner which is the combination of Series Active Power Filter (SAPF) and Shunt/Parallel Active Power Filter (PAPF) sharing a common DC bus capacitor. A Left Shunt UPQC (LS-UPQC) configuration...
This paper presents the simulation of different types of single as well as composite power quality events (PQ) for analysis and characterization. Most of the power quality problems (the transient and steady state disturbances), which can occur in the distribution system, have been obtained. Six single PQ event such as voltage sag, voltage swell, interruption, transients, voltage notch and harmonics...
In grid-tied photovoltaic (PV) power systems, the significant power variation that is caused by solar irradiation intermittency is one challenge for consistent efficiency and power quality. In particular, the system suffers from low system efficiency and poor power quality under low solar irradiation condition. Burst mode operation is a possible solution to the above issues and helps maintain a quality...
This paper proposes a new modular multilevel converter based unified power quality controller (MMC-UPQC). As one of the key technologies of MMC-UPQC, the start strategy is discussed and combined with the establishment of the DC side capacitance voltage. In this paper, the main circuit of MMC-UPQC and the operating states of MMC sub-modules (SMs) are described in detail. Two start control strategies...
One of the major power quality problems in distribution systems are voltage sags. This paper deals with a dynamic voltage restorer (DVR) as one of the different solutions to compensate these sags and protect sensitive loads. However, the quality of DVR output voltage, such as THD, is important. This paper present a new configuration of DVR based on stacked multicell (SM) converter. The main properties...
Voltage sags are major power quality problems in distribution systems. To overcome these problems, different solutions have been proposed to compensate these sags and protect sensitive loads. As a solution, dynamic voltage restorers (DVRs) have been proposed to provide higher power quality. However, the quality of DVR output voltage, such as THD, is important. So, in this paper a configuration of...
One of the major power quality problems in distribution systems are voltage sags. This paper deals with a dynamic voltage restorer (DVR) as one of the different solutions to compensate these sags and protect sensitive loads. However, the quality of DVR output voltage itself, such as THD, is important. So, in this paper a configuration of DVR based on flying capacitor multicell (FCM) converter is proposed...
This paper deals with a high-powered, low-loss and digital current disturbance generator. It can produce harmonic current, active current, inductive reactive current and capacitive reactive current, so it is able to simulate kinds of actual industrial situations. By using energy feedback technology, the generator feeds the power consumed by the current disturbance back to the grid. Thus, it can save...
In this paper, three different system topologies for dynamic voltage restorers (DVRs) are modeled and tested using Simulink's SimPowerSystem Toolbox for power system quality studies. The DVR controls are based on hysteresis voltage control. Simulation tests on radial distribution system, equipped with the DVR under three-phase and single-phase voltage sags with phase jump, are used to verify the operation...
In this paper Z-source ac-ac converter has been analyzed for compensation of voltage sags and swells and maintenance of continuous regulation in output voltage. A brief discussion about voltage sags and swells is done, and then Z-source ac-ac converter topology, control and operation are reviewed. Finally, simulation analysis has been done using Matlab/Simulink software and its results confirm theoretical...
The total harmonic distortion (THD) monitoring is an important challenge in the industrial and office building environment. The IEEE-519 and IEC 61000-3 standards limit the individual harmonics current as well as the THD for nonlinear power electronic loads. A harmonic current distortion comparative study of a classical three-phase rectifier diode (TPRD) and rectifier with near sinusoidal currents...
Power quality problems such as voltage sags are presently important issues in the industrial field. The dynamic voltage restorer (DVR) is a series compensation device that mitigates voltage sag problems. Due to the nonlinearity of the DVR dynamic characteristics, the compensating performance of the DVR is affected much by its control strategy. In this paper, a backstepping control is proposed to improve...
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