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Increasing penetration level of photovoltaic (PV) distributed generation (DG) into distribution networks will have many impacts on nominal circuit operating conditions including voltage quality and reverse power flow issues. In U.S. most studies on PVDG impacts on distribution networks are performed for west coast and central states. The objective of this paper is to study the impacts of PVDG integration...
The impact of Dstatcom size and location on the voltage regulation of a distribution system is investigated in this research work. Possibility of coordination between Dstatcom units at different locations in the system is investigated. Dstatcom model available in Matlab Simulink is adopted for the study. The dynamic behavior of the Dstatcom due to switching on a large industrial load, line outage...
This paper describes the impact of the operation of distributed energy sources on voltage quality parameters in low voltage distribution grids. The survey is based on the evaluation of 60 voltage quality measurements which were carried out in 30 different low voltage distribution grids with connected power sources. These 60 measurements were made in 2014 and were evaluated according to the standard...
Distribution Service Operators (DSO's) have historically ensured voltage quality with a range of strategies. However, DSO's now face tough challenges addressing voltage quality due to a number of emerging drivers. Integration of renewable energy into the distribution grid, increased sensitivity of customers to voltage quality and ongoing regulatory developments are increasing the workload of DSO's...
This paper proposes a series multi-objective VQDG which can generate typical voltage disturbance, such as flicker, sag or swell, harmonics, unbalance and their superimposition applied to testing load. In the application, the cascade H-bridges inverter is seriesly connected between the gird source and the testing load. The device has two advantages: the output disturbance voltage level is low and the...
The impact of voltage quality on the operation of sensitive equipment is very critical. Dynamic Voltage Compensator (DVC) is the prime solution to mitigate the voltage quality problems. This paper investigates the compensation performance of a DVC connected to a distribution system, equipped with a simple control based on in-phase compensation and without using any transformations for reference generation...
CEER and EURELECTRIC cooperation in the field of quality of electricity supply, involving joint meetings and the participation at the relevant CENELEC Technical Committee, contributed to the results attained in the recent publication of the EN 50160:2010 edition that includes a new voltage dips classification table allowing harmonisation at European level on voltage dips data collection. The generalisation...
The IEEE 1250 Guide has been updated and largely re-written over the past six years and is now designed as a tool to assist facilities managers and utility engineers in finding common ground. This paper describes how to use it in designing and troubleshooting to achieve compatible power quality.
The use of some electrical equipment attached to typical power systems creates voltage quality concerns. There is an increasing awareness that some equipment is not designed to withstand the surges, faults, distortion, and reclosing duty present on typical utility distribution systems. Traditional concerns about steady-state voltage levels and light flicker due to voltage fluctuation also remain....
Proliferation of the voltage-sensitive loads in the distribution systems has made the voltage quality an important issue. The main factors considering the voltage quality are the voltage sags and voltage swells. There are many available solutions to improve voltage quality. In the past years, application of the power-electronic based devices known as custom power devices have developed an interesting...
This paper describes a wave-to-wire model of an array of wave energy converters developed in MATLAB/Simulink. The effects of connecting a 1 MW wave farm to a weak, rural electricity network are investigated. Impacts of the wave farm on voltage quality are examined and both conventional and more intelligent control methods by which these impacts can be mitigated are discussed. The control methods compared...
Distributed generation (DG) injects new vigor into the power system, but it sometimes brings unfavorable factors influencing the power quality of distribution network. In this paper, the Dynamic Voltage Restorer (DVR) is introduced to the distribution network to improve the power quality. In view of that the detection of voltage compensation is the key factor that influences the effect of voltage...
This paper studies the FPGA-based control 4 H-bridge cascaded 9-level structure of voltage quality adjustment device, for the variety of voltage quality issues appears in electric power system, providing a comprehensive solution. With the voltage swell, voltage sag, voltage harmonics, voltage fluctuations which occurs in the power system, it can give out the complex compensation, so as to ensure the...
Dynamic voltage restorer (DVR) has been demonstrated to be a very effective mechanism to deal with key voltage-quality disturbances. Although the dynamic response requirement could be satisfied by a feedforward control strategy, the high-quality voltage requirement and zero-error tracking need an advanced feedback control strategy. This paper proposes a multi-proportional-resonant based feedback control...
Most of the dispersed generation systems (DGS) have smaller installation capacity and have to be connected to the distribution network to supply electric power into the utility as well as local loads. When the DG is interconnected in parallel with the utility distribution system, some operating conflicts might arise that affect the system power quality. This paper investigate the effect of DG on the...
A novel main circuit topology of voltage quality compensator (VQC) is proposed in this paper, composed of PWM rectifier and cascade H-bridges inverter. The three phase inverter is decoupling controlled. PWM rectifier is adopted to maintain the dc-bus voltage stably and provide or absorb real power. The inverter is controlled by carrier phase shifting with FPGA. The simulation model is set up on the...
In today's world, according as interest about renewable energy source rises, many researches are progressing about energy source development and power distribution system configuration for improving renewable energy source's efficiency. The microgrid is small power system that consists of several consumer's loads and small size distributed resources and accomplishes one independent system. It is operated...
This paper investigates the use of energy storage added to a shunt active filter configuration in order to enhance its operation in maintaining power quality conditioning at a particular part of a grid system. The specific application considered is for a microgrid. In the proposed configuration the shunt active filter with energy storage (SAFES) can supply both reactive and real power for a short...
This paper gives an overview of the power quality regulation of transmission grids applicable to end-consumers and distribution network operators in France, the Netherlands and UK. First, an overview of the transmission network operators, the voltages at which the transmission grid operates and the regulators is given, followed by an overview of the quality indicators, registration of quality indicators...
This paper investigates reactive power compensation strategies to mitigate voltage quality problem in power system such as flicker, sag, swell and unbalance. We choose to utilize STATCOM (Synchronous static compensator), which encompasses advantages including, but not limit to, rapid response time and the ability to provide reactive power at low voltage, and to provide voltage compensation. Based...
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