The control of a static var compensator and active power filter (original) (raw)
Related papers
2012
In this paper the current harmonic can be compensated by using the Hybrid Power Filter, the Passive Power Filter and the combination of both. The system has the function of voltage stability, and harmonic suppression. The reference current can be calculated by using a new control algorithm by using three phase hybrid shunt Active power. An improved Control algorithm is proposed to improve the Performance of Hybrid Power filter. This paper deals with Space Vector Pulse Width Modulation technique to generate the gating pulses to VSI(Here VSI is using as a filter) . The simulation results of the Non-linear systems have been carried out with MATLAB 7.6., MULTISIM.
Scholars Journal of Engineering and Technology , 2020
Power factor correction is a way of counteracting the undesirable effects of electric load that create power factor less than unity. The word "converter" in wider perspectives include all the devices that convert electrical energy from one form to another, e.g. inverters, rectifiers or power pack. The term can also denote frequency converter and/or circuit that beat signals together to form a new signal frequency. Pulse Width Modulation (P.W.M) is a method of varying the mark-to-space ratio of the output voltage waveform during a cycle so as to minimize the magnitude of harmonics in the output. Modulation may be done by using transistors as switches instead of thyristors because transistors have much higher switching frequencies, thus, leading to improve and more efficient operation of the thyristors with switching time of about 1 to 2 seconds. In this paper, a single-phase and three-phase bridge rectifier circuits' power factors were modeled and simulated in MATLAB. The resulting voltage wave forms displayed in Figures 4 and 5 respectively showed that P.W.M method is a premier compared with other methods and is also better at low output voltage demand. Again, by using several pulses in each half cycle of the output voltage, it can reduce harmonic contents at low output voltages. In P.W.M, control is made independent of alpha (), the firing angle of thyristor, and as such all the switching loss problems and electromagnetic interference (EMI) noise associated with switches/switching are totally eliminated here.
2001
This paper presents a simple of active power filters (APF) design techniques to minimize harmonic distortion and improve power factor caused by a harmonic source such as variablefrequency drives (VFDs) using 12-pulse converters. A method is finding the maximum rating of active power filter to minimize voltage and current harmonic distortion at a load bus where it is desired to maintain the displacement power factor at a desired level constraining the compensator value, which would create resonance condition. The water treatment plants require the operation of many parallelconnected VFDs on the same bus, such as a system significantly increases the power quality problems. The purpose of APF is sufficient to eliminate the harmonic currents, balance currents of the ac line input and increase power factor. The results show that the APF are a very appropriate solution for most typical harmonic problems, unbalanced current and power factor correction.
Influence of Switching Elements on Harmonics and Power Factor Improvement
Increasing demand for electrical energy by utilities has necessitated efficient utilization of available power. Most of the loads in the industry and domestic applications are inductive in nature causing a lagging power factor. This causes a reduction in the utilization of the power input. For the same power input the utilization can be improved by improving the power factor. Further the presence of harmonics results in poor quality of the power leading to losses. . In present days, solid state electronics control electric motors are frequently used for drive control (speed and torque). This can introduce harmonics in current and voltages. The general opinion among technologists is that improvement in power factor reduces losses in an electrical system. Although this is true in a general way, it is not so in systems which use switched electronic devices that can introduce large amount of harmonics .
Acta Electrotehnica, Vol.46, Nr.3, 2005
The paper deals with the very actual problem of the public line conditioning. The concept of active and complex line-conditioning with the help of the power electronic PWM DC converters is discussed. Then are investigated the possibilities to implement the active line-conditioning based on the PWM AC-to-DC converters and switched-mode power supplies, SMPSs. As a result the paper proposes attractive alternative solutions to the actual power conditioning equipments, static reactive power compensators or active filters.
Design and Performance Analysis of an Active Power Factor Corrector
Journal of Kerbala University, 2014
Electrical devices, which mostly used at houses, industrial, commercial purposes and other applications,require amendment for itspower to some standard forms. Typically, rectification would be necessaryfor a proper operation and for a high performance.The electrical devices are representedas non-linear loads therefore, it isproducing a non-sinusoidal current, and as a result, they are working with a poor power factor. In this research paper,an active power factor correction circuit designed by using Switch Mode Power Supply (SMPS) "Buck Converter"type, to improve the power factor. The input parameters are 220V, 50Hz. Moreover, the Average Current Mode Control (ACMC) method has been implemented to observe the effect of the corrected active power factor on the circuit. Theresearch starts with the study of the power factor anddesigning the proposed system.The software P-SIM (6.1)will be used in designing the circuit and viewing the waveforms. The main advantage of use P-SIM software is providing a powerful simulation environment for power electronics and power conversion systems. Finally, the simulation results in the current research are compared with the adopted research results.
A simple control scheme for hybrid active power filter
2000
A simple control scheme for hybrid active power filters connected in parallel is presented and analyzed in this paper. The hybrid active power filter combines the compensation characteristics of resonant passive and active power filters. The series active power filter is implemented with a three-phase PWM voltage-source inverter. The proposed scheme is able to compensate displacement power factor and current harmonics simultaneously. The combination of passive and active power filters allows a better performance compensation of high power voltage nonlinear loads. The proposed control scheme is discussed in terms of principles of operations under steady state and transient conditions. The design and implementation of the power and control circuits are reported. Finally, key predicted results are verified experimentally on a 5 kVA prototype model