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The ever mounting demand of electrical energy and the keen scarcity of conventional energy sources leads to the burgeon of distributed generation (DG) system. The main abstruse is the harmonization of the DG to the utility grid. Generally current regulated PWM voltage-source inverters (VSI) are used for synchronizing the utility grid with DG source in order to meet the following objectives: 1) To...
A reliable islanding detection method is one of the most important function of a well designed inverter based distributed generation (DG) system. Active islanding detection methods have negligible non-detection zone, but they bring some power quality issues to the network. In this paper an islanding detection method which addresses constant current inverter based DGs is introduced. It has both high...
This paper deals with the power flow analysis and control strategy research of unified power quality conditioner (UPQC). A UPQC is a combination of shunt and series active power filter (APF), sharing a common dc link. It can compensate almost all power quality problems such as voltage harmonics, voltage unbalance, voltage flickers, voltage sags, voltage swells, current harmonics, current unbalance,...
Recently, distributed generators are applied not only to inject power into the grid/local load, but also to compensate power quality problems. In this paper, a method for selective voltage harmonics compensation in microgrid based on the proper control of distributed generator (DG) interface converter is proposed. In this method, active and reactive power control loops are considered to control the...
Voltage source converter based DSTATCOM has been accepted as the most preferred solution for reactive power management in distribution power networks which plays a vital role in improving power quality, correcting power factor and maintaining constant distribution voltages. However, the quality of DSTATCOM output voltage and current itself, such as injected harmonics and Total Harmonic Distortion...
The unified power quality conditioner (UPQC) is a combination of back to back connected shunt and series active power filters (APFs) to a common DC link voltage, which compensates voltage and current based distortions, independently. Generally the power conditioning devices are designed for complete compensation, irrespective of the requirement/priority. In this paper flexibility of selective compensation...
Due to a large amount of non-linear power electronic equipments, impact and fluctuating loads (such as that of arc furnace, heavy merchant mill and electric locomotive, etc), problems of power quality have become more and more serious with each passing day, as a result Active power filter (APF) gains much more attention due to excellent harmonic compensation. But still the performance of the active...
Different kinds of sources with different capacities can be connected to a Microgrid. In autonomous operation when Microgrid is disconnected from the main grid, beside feeding total load and sharing power between sources, voltage and frequency requirement of the loads should be met. In this paper a droop control is applied to a standalone multi-converter based power system. Frequency and voltage are...
In most of the situations, power electronics converters are mainly used as an interfacing device between distributed generation (DG) system and utility grid in order to meet the following objectives: 1) grid synchronization 2) active and reactive power control through voltage and frequency control 3) improvement of power quality (i.e. harmonic elimination) etc. But due to wide variation of the reactive...
This paper focuses on an active shunt compensator suitable for reactive, unbalanced and harmonic loads under both balanced and unbalanced operating conditions of the grid. A stationary reference frame based controller with multiple resonant peaks (proportional + multiresonant controller) is used in order to achieve high accuracy of current compensation. However, the performance of the system depends...
In this paper, a dual-loop control scheme is proposed for inverters in three-phase four-wire microgrid applications to improve the power quality within the microgrid and the power quality of the current flowing between the microgrid and the utility grid. The control scheme involves an inner voltage loop and an outer current loop, with both controllers designed using the H∞ repetitive strategy. This...
Increasing non-linear loads cause various undesirable effects and power quality problems on utility supply, like low system efficiency, poor power factor, derating of power supply equipments, disturbance to other consumers and interference in nearby communications networks etc. This work proposes a parallel power processing scheme to improve the power quality of uncontrolled diode bridge rectifier...
This paper presents a new control strategy for adaptive hysteresis current control based power quality studies for an induction motor to eliminate harmonics and to compensate the reactive power. The adaptive hysteresis band current controller changes the hysteresis bandwidth according to modulation frequency, supply voltage, dc capacitor voltage and slope of the reference compensator current wave...
This paper presents a single phase grid-connected PV system integrating energy storage system (ESS) using cascaded multilevel inverter. A Discrete Fourier Transform (DFT) Phase Locked Loop (PLL) method is proposed to improve system dynamic performance. A coordinated active and reactive power management (ARPM) strategy is developed based on the dual-stage DFT PLL method. The point of common coupling...
Growing numbers of consumers distort AC networks with harmonics. Therefore suppression of the network pollution should be considered. This problem can be solved by using "network-friendly" converters. In this article some consumers are presented that pollute the single-phase AC networks with harmonics. Therefore the network voltage waveform will be distorted. In our study we examine the...
This paper presents a novel Electric Energy Management compensator based on Multi Objective Particle Swarm Optimization search technique MOPSO for use in hydrogen and island electricity generation. It combines a fuel cell power source and a micro hydro water turbine. The novel control strategy is designed to achieve the high-efficiency coordinated operation of the two individual power sources and...
This paper presents a Zeta DC-DC converter as a power factor correction (PFC) converter which is operated in voltage control mode for speed control of a permanent magnet brushless DC motor (PMBLDCM). The proposed converter performs the PFC action and DC link voltage control in single stage and needs only one controller. The current multiplier approach with average current control is employed for PFC...
In this paper, a neural network based reference current computation method for active power filter (APF) control under non-ideal mains voltage with different load condition is proposed. The neural network controller has been designed to extract fundamental frequency components from non-sinusoidal and unbalanced currents. These fundamental frequency components will be used as unit templates. The APF...
In this paper, a novel neural network based phase locked loop (PLL) less reference current computation method for active power filter (APF) control under non-ideal mains voltage conditions with different load condition is proposed. The neural network controller comprises two similar adaptive linear neurons (ADALINE), and it has been designed to extract fundamental frequency components from non-sinusoidal...
STATCOM has been widely proposed for power quality and network stability improvement. It is easily connected in parallel to the electric network and has many advantages for electrical grids. It can improve network stability; power factor, power transfer rating and can avoid some disturbances such as sags and swells. Most of STATCOM controllers are based on voltage controllers that are based on balance...
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