A new topology of active filter to correct power-factor, compensate harmonics, reactive power and unbalance of three-phase four-wire loads

2003 ◽  
Author(s):  
B.N. Singh ◽  
P. Rastgoufard
Keyword(s):  
Power Factor ◽  
Reactive Power ◽  
Active Filter ◽  
Three Phase

scholarly journals Design and Simulation of three Phase three Wire Shunt Active Filter using Instantaneous PQ Theory

2020 ◽  
Vol 15 (1) ◽  
pp. 181-186
Author(s):  
Tilak Giri ◽  
Ram Prasad Pandey ◽  
Sabin Bhandari ◽  
Sujan Moktan ◽  
Lagat Karki
Keyword(s):  
Power Factor ◽  
Communication Systems ◽  
Reactive Power ◽  
Active Filter ◽  
Shunt Active Filter ◽  
Current Harmonics ◽  
Passive Filter ◽  
Three Phase ◽  
Wide Range ◽  
Source Current

Due to intensive use of power converters and other non-linear loads, power quality is degrading. The presence of harmonics in the power lines result in greater power losses in distribution, interference problems in communication systems. Non linearity reduces the efficiency and power factor of the system. As the power factor reduces, the reactive power demanded from the supply increases which have no any contribution in energy transfer, so compensation is required. For this, shunt passive filter has been developed but it is bulky and frequency dependent and has many drawbacks. In contrast to passive filter, shunt active filter (SAF) has been developed which is smaller and has wide range of applications. In this paper, shunt active filter based on p-q theory is demonstrated for compensating reactive power and current harmonics. Simulation has been done with and without SAF and results are presented and ended with recommendation and conclusion. An effort is made to reduce the THD of the source current below 5% (specified by IEEE).

Reactive Power Compensation for Unbalanced Fluctuating Loads by Using Two-Dimensional Space Vector and a Static Var Compensator

2014 ◽  
Vol 533 ◽  
pp. 397-400 ◽  
Author(s):  
Chi Jui Wu ◽  
Yu Wei Liu ◽  
Shou Chien Huang
Keyword(s):  
Power Factor ◽  
Reactive Power ◽  
Dimensional Space ◽  
Measurement Data ◽  
Power Source ◽  
Active Power ◽  
Two Dimensional ◽  
Static Var Compensator ◽  
Space Vector ◽  
Three Phase

To modify the power factor and balance the three-phase currents simultaneously, this paper proposes the instantaneous compensator to calculate the compensation current. The instantaneous compensator utilizes two-dimensional instantaneous space vector and setting the active power as a constant for each cycle which can improve power quality effectively. Moreover, the instantaneous compensator requires an independent power source, whose capacity can be reduce by using a static var compensator (SVC). An SVC does not interfere with the capability of the instantaneous compensator. Field measurement data were analyzed. Simulation results confirmed the feasibility of correcting the power factor and balancing load currents simultaneously using the proposed method.

scholarly journals Decoupled Control of Three Phase Grid Connected Solar PV System

2019 ◽  
Vol 9 (2) ◽  
pp. 4218-4222
Keyword(s):  
Solar Energy ◽  
Power Factor ◽  
Control Strategy ◽  
Reactive Power ◽  
Standard Test ◽  
Effective Control ◽  
Solar Pv ◽  
Pv System ◽  
Three Phase ◽  
Decoupled Control

A reliable grid connected Photovoltaic (PV) system require effective control schemes for efficient use of solar energy. This paper presents a three-phase grid tied PV system with decoupled real and reactive power control to achieve desired power factor with Maximum Power Point Tracking (MPPT) controller to get maximum solar energy. The synchronous reference frame (dq) control along with decoupling concept is used to control the DC-AC inverter output, while the Phase Locked Loop (PLL) synchronization technique is used to monitor and synchronize the voltage and current at the grid side. The DC-DC converter with Incremental Conductance (InC) based MPPT model is also designed in this paper due to better accuracy compared to Perturb & Observe (P&O) algorithm. The simulation is performed in MATLAB/SIMULINK and a 31.5 kW PV system is modelled to get 30 kW power with the help of MPPT at Standard Test Conditions (STC). Any power factor value between 0.85 lagging to 0.9 leading can be obtained by changingreference q current in this inverter control strategy. The simulation results show that the change of reactive powerdoes not affecttheactive power values of the system, which verifies the effectiveness of the decoupled control strategy of the inverter.

scholarly journals Three Phase Enhanced Electrical Energy Metering System

2020 ◽  
Vol 16 ◽  
Keyword(s):  
Low Power ◽  
Power Factor ◽  
Reactive Power ◽  
Electrical Energy ◽  
Human Errors ◽  
Existing Problems ◽  
Control Units ◽  
Three Phase ◽  
Energy Metering ◽  
Core Losses

This paper presents a practical solution for two existing problems in traditional electrical energy measurements. The first problem is the manual electrical billing system; so far, some countries are still adopting a manual technique with a high percentage of human errors and much complains from the consumers’ side and a lot of work from the authorities’ side. The second problem is having a low power factor at most of the domestic loads and some main commercial ones. Low power factor causes more current to flow in the network leading to an overheating of transformers and cables, and an increase of the core losses of transformers; in addition, less power factor means more burned fuel and more environment pollution. In This study, an automated solution for both problems is introduced, where two control units are added to the already existing three phase energy meters. The first unit solves the problem of manual billing by automatically calculating the monthly bill and sending monthly SMS messages to the consumers as well as authorities. The second unit solves the problem of low power factor by injecting reactive power using capacitor bank at the end load points to maintain a power factor of 0.95 at all load cases. A penalty will be added to the monthly calculated bill once the above value is violated. A prototype was implemented proving the capability of introducing both solutions using existing meters with a reasonable added cost

scholarly journals A line-interactive UPS system implementation with series-parallel active power-line conditioning for three-phase, four-wire systems

2005 ◽  
Vol 16 (2) ◽  
pp. 200-210 ◽  
Author(s):  
Sérgio Augusto Oliveira da Silva ◽  
Pedro F. Donoso-Garcia ◽  
Porfírio C. Cortizo ◽  
Paulo F. Seixas
Keyword(s):  
Reactive Power ◽  
Current Source ◽  
Input Voltage ◽  
Power Line ◽  
Active Power ◽  
Active Filter ◽  
Active Filters ◽  
Voltage Source ◽  
Three Phase ◽  
Uninterruptible Power

This paper presents a three-phase line-interactive uninterruptible power supply (UPS) system with active series-parallel power-line conditioning capabilities. Synchronous reference frame (SRF)-based controller is used for harmonic and reactive power compensation generated from any configuration of non-linear loads. Under normal line conditions the UPS system works with universal filtering capabilities, such as compensating the input currents and output voltages. Two three-phase pulsewidth modulation (PWM) converters, called series and parallel active filters, are used to perform the series and parallel active power-line compensation. The series active filter works as sinusoidal current source in phase with the input voltage, drawing from utility sinusoidal and balanced input currents with low total harmonic distortion (THD). The parallel active filter works as sinusoidal voltage source in phase with the input voltage, providing regulated and sinusoidal output voltages with low THD. The performance of the UPS system is evaluated in three-phase, four-wire systems. Experimental results are presented to confirm the theoretical studies.

Vector Decoupling Control Strategy for Three-Phase Voltage Source PWM Rectifier

2013 ◽  
Vol 336-338 ◽  
pp. 450-453
Author(s):  
Jian Ying Li ◽  
Wei Dong Yang ◽  
Ni Na Ma
Keyword(s):  
Power Factor ◽  
Control Strategy ◽  
Reactive Power ◽  
Decoupling Control ◽  
Voltage Source ◽  
Pwm Rectifier ◽  
Phase Voltage ◽  
Unity Power Factor ◽  
Three Phase ◽  
Rotating Coordinates

In view of the fact that active power and reactive power have coupling relation, a novel vector decoupling control strategy is presented for three-phase voltage source PWM rectifier. In the paper, the power control mathematical mode of the PWM rectifier is deduced based on the mathematical model of rectifier in synchronous d-q rotating coordinates, and a new voltage feed forward decoupling compensation control strategy is proposed. The simulation results show that the voltage and current of the three-phase PWM rectifier have better respond preference, the current aberrance is smaller and the voltage is steady under the control strategy. The PWM rectifier can implement PWM commute with unity power factor, but also feed back the energy to AC side with unity power factor.

Simulation Study of Harmonics and Reactive Power in Three-Phase Full-Bridge Controlled Rectifier Circuit with Resistance-Inductance Load

2011 ◽  
Vol 383-390 ◽  
pp. 621-626
Author(s):  
Yu Fei Wang ◽  
Chang Hui Yang ◽  
Hua Xue ◽  
Xiu Yang
Keyword(s):  
Power Factor ◽  
Simulation Study ◽  
Reactive Power ◽  
Simulation Analysis ◽  
Electronic Devices ◽  
Power Electronic ◽  
Specific Design ◽  
Matlab Simulink ◽  
Rectifier Circuit ◽  
Three Phase

In order to evaluate the harm and impact of power electronic devices on the grid and provide numerical basis for specific design of the corresponding compensated devices, the harmonics and reactive power of three-phase full-bridge controlled rectifier circuit with resistance-inductance load are studied in this paper. Firstly, the harmonics and power factor of the ac side current are analyzed theoretically; the harmonics contents and power factor are calculated. Secondly, the model of three-phase full-bridge controlled rectifier circuit is built in Matlab/Simulink, and the simulation analysis of the ac side power factor and harmonics is achieved, the simulated values are similar to the theoretical values. The results show that the complex calculations of harmonics and power factor can be completed simply and intuitively using simulation study, the simulation study is efficient and accurate.

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