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In this paper, a new configuration of a multi-functional grid-connected inverter is proposed to improve both voltage-based and current-based power quality issue. By implementing bidirectional switches using semiconductor devices, a multi-functional grid-connected inverter can be connected in series or parallel to the grid and provides three modes of operation. This paper presents the control scheme...
Voltage dips or sag creates useless conflict at the customer side as well as utility side. In this paper, dynamic voltage restorer device based on voltage source converter (VSC) topology is used to compensate voltage sag. Dynamic Voltage Restorer (DVR) is a power electronic device that is utilized to improve voltage stability i.e. to reduce the power quality problems in electrical power system network...
Modernized grid needs ancillary service as a variety of distributed energy resources are connected. Vehicle-to-grid (V2G) application is one of promising distributed energy resources, which enables to transfer bidirectional power between batteries of plug-in electric vehicle and the grid as well as offer ancillary service to the grid. Benefits of V2G application are voltage and frequency regulation,...
To mitigate voltage disturbances in low voltage distribution system dynamic voltage restorer (DVR) with energy storage device is used in this paper. DVR is installed between supply and load which will inject voltage and active power to the distribution system during balanced voltage sag and swell disturbances. The super capacitor is used as an energy storage device in this paper. The performance of...
For the multiple-output auxiliary power in application of the motor servo drive system, we built up the model of a 3-port flyback type power converter, analyzed the loop current in a cycle, established the relationship between the pre-load value and pulsating voltage value, then proposed a method to calculate the pre-load value which can obtain improved cross-regulation characteristic as well as meeting...
This paper investigates the transient voltage sags/swells subsequent to islanding of a PV-Battery microgrid. For an unplanned islanding and micro-grid formation, during islanding detection time, the microgrid is disconnected from main grid while the control mode of the BESS stays the same as before. Consequently the microgrid will undergo transient voltage sag or swell caused by the mismatch of the...
This paper proposes a new way based on FPGA to realize decoupled double synchronous reference frame software phase locked loop (DDSRF-SPLL) under unbalanced conditions. DDSRF-SPLL can lock in unbalanced grid voltage accurately as well as overcome the impact of the phase-locked loop on frequency performance in adopting the positive and negative sequence decoupling algorithm. When the frequency of three-phase...
Voltage sags caused by short circuit in a distribution system can heavily influence power quality parameters. In this paper an application of custom DVR is analyzed and proposed for mitigating of voltage sags considering unbalance, voltage sags and fluctuations and distortion of voltages in an industrial distribution system. The paper presents system operation and controller design approaches, verified...
Renewable power generation such as rooftop solar PV is resulting in high number of installation due to incentives as drop in prices and environmental awareness. The uncertainty of solar irradiance and cell temperature cause its output power to be varied. Considering high penetration of rooftop solar cell and also load profile in LV distribution system will lead to much more voltage fluctuations. Then,...
This paper presents a comprehensive review on various impacts of DG integration on PQ and importance of proper grid-integration planning in light of maintaining PQ at the levels compliant with grid code requirements. It also focusses on the effective utilization of DGs for power quality enhancement in the utility grids. The proposed solutions essential for PQ enhancement in electricity networks with...
The most severe power quality problems are known as voltage sag, swell and harmonics. Series connected custom power device called as dynamic voltage restorer (DVR) is the most effective device used in electrical systems to compensate these power quality problems. Traditional DVR compensates only voltage sag/swell in electrical grids. The main contribution of this paper is that FFT based a novel reference...
My research analyses how introduction of LV network management systems could contribute to improvement of reliability indicators i.e. quality of service defined in MSZ EN 50160 standard and by Hungarian Energy and Public Utility Regulatory Authority (MEKH).
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...
Protection of Distributed Generation (DG) injected Distribution network (DN) is a challenging task in entire electrical ancestors. The connection of DG to the distribution network alters the nature of the network. Expose of DG can alter the fault current during the grid disturbance or external fault and perturb the existing distribution protection system, one of them in the event of a fault where...
The most interesting issue for electrical engineers is power quality/power quality improvement in modern era. Power quality is the most noticeable trouble for electrical engineering students. This problem occurs due to occurrence of substandard voltage, may be substandard current, and of frequency which contain harmonics which may damage to power system equipments. Many power supplying companies,...
A power quality problem is an occurrence which depicted as a nonstandard voltage, current or frequency that results in a failure or a dis-functioning of end use equipments causing a havoc to system performance. The aim therefore, in this work to maintain a proper voltage profile by mitigation of sag due to faults in power system occurred due to several reasons like energizing of heavy loads, transformers,...
Energy storage technologies are increasing their presence in the market and integration of these technologies into the power grid is slowly becoming a reality. An interline dynamic voltage restorer has used to provide sag and swell the compensation and improvement of displacement power factor during normal condition. The concept of integrating ultra-capacitor based energy storage into an interline...
Power Quality (PQ) is the most significant perspectives at transmission and distribution levels. The supply of high grade electrical services required to the customers illustrates this concept. The voltage sag and swell are the most frequent PQ problems that mainly occur in the distribution systems since it may cause equipment tripping, failure of drive systems, shutdown for domestic and industrial...
Accurate estimation of grid phase angle and magnitude is important for effective operation of Dynamic Voltage Restorer (DVR). Under unbalanced voltage sags, the estimated output voltages of a conventional SRF-PLL contain a second harmonic ripple which makes it difficult to control DVR. In this paper a DSOGI pre-filter based PLL is employed to extract the symmetrical components of the grid voltage...
This paper investigates the basic proportional integral (PI) controller for power quality (PQ) improvement using a 12-pulse voltage source converter (VSC) based high voltage direct current (HVDC) transmission system. The PI controller's parameters are selected using Zeigler Nichols approach and applied for PQ improvement during various transients. A reduced current sensor topology is used to minimize...
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