scholarly journals The Simulation of Compensator based on Vector Control Method For Power Factor Improvement using MATLAB

2011 ◽  
pp. 134-139
Author(s):  
Sangam Singh
Keyword(s):  
Power Factor ◽  
Reactive Power ◽  
Control Method ◽  
Electronic System ◽  
Power Electronic ◽  
System A ◽  
Static Var Compensators ◽  
Non Linear Systems ◽  
Power Factor Improvement ◽  
System Operating

Power electronics systems are non-linear systems, which consume more reactive power and also the loads they feed are mostly inductive loads which leads to a poor power factor. Various compensation techniques are available to bring the power factor nearer to unity. In this paper, a novel compensator is proposed, where in-phase and quadrature components of the supply current are vector-controlled. Implementation of this compensator in a power electronic system operating with a very poor power factor (and hence high THD), shows that the system then draws a leading current. A conventional power electronic system, A conventional power electronic system with one of the traditional static VAR compensators and the conventional power electronic system incorporated with the proposed compensator are simulated and the simulation results are obtained. It is shown that the proposed method offers only 0.7% THD, which also implies that the power factor is improved.

scholarly journals An R-L Static Var Compensator (SVC)

2020 ◽  
Vol 5 (12) ◽  
pp. 46-51
Author(s):  
A. J. Onah ◽  
E. E. Ezema ◽  
I. D. Egwuatu
Keyword(s):  
Power Factor ◽  
Reactive Power ◽  
Electronic Devices ◽  
Switched Capacitor ◽  
Power Electronic ◽  
Static Var Compensator ◽  
Unity Power Factor ◽  
Static Var Compensators ◽  
Thyristor Controlled Reactor ◽  
Shunt Reactors

Traditional static var compensators (SVCs) employ shunt reactors and capacitors. These standard reactive power shunt elements are controlled to produce rapid and variable reactive power. Power electronic devices like the thyristor etc. are used to switch them in or out of the network to which they are connected in response to system conditions. There are two basic types, namely the thyristor-controlled reactor (TCR), and the thyristor-switched capacitor (TSC). In this paper we wish to investigate a compensator where the reactor or capacitor is replaced by a series connected resistor and reactor (R-L). The performance equations are derived and applied to produce the compensator characteristics for each of the configurations. Their performances are compared, and the contrasts between them displayed. All three configurations are made to achieve unity power factor in a system.

Study on Current Detecting and Control Method for STATCOM across Transformer

2011 ◽  
Vol 130-134 ◽  
pp. 1933-1937
Author(s):  
Cun Ping Wang ◽  
Xiang Gen Yin ◽  
Jian Liu ◽  
Qing Xiong
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Electronic Device ◽  
Control Strategies ◽  
Power Electronic ◽  
Output Current ◽  
Load Current ◽  
Decoupling Method ◽  
Reactive Current ◽  
And Control

Static var compensator (STATCOM) is a widely used power electronic device for dynamic reactive power compensation, and its current detecting and control method generally adopts d-q decoupling method based on the synchronous rotating coordinate transformation. However, in the traditional method, the load reactive current component is directly used as the command of STATCOM output current, so it is required that the installation position of STATCOM must be consistent with load current detecting point. But in practice, STATCOM installation point and load current detecting point may be located at two different sides of the transformer. For this situation, this paper proposed an improved reactive current detecting and control method based on the principle of power balance, achieving the current detecting and control strategies when the two points are located at different sides of transformer. Finally, the simulation of system with STATCOM accessed from the third winding of transformer verifies the correctness and feasibility of the proposed method.

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.

Control Method of Inverter for Large-Scale Grid-Connected Photovoltaic Generation System

2013 ◽  
Vol 448-453 ◽  
pp. 2507-2510
Author(s):  
Zhuo Zhang ◽  
Hong Wei Li
Keyword(s):  
Power Factor ◽  
Feedback Linearization ◽  
Large Scale ◽  
Reactive Power ◽  
Control Method ◽  
Solar Irradiation ◽  
Dynamic Feedback ◽  
Photovoltaic Array ◽  
Grid Connected Inverter ◽  
Photovoltaic Plant

A grid-connected inverter control method to analyze dynamic process of large-scale and grid-connected photovoltaic (PV) power station is proposed. The reference values of control variables are composed of maximum power output of the photovoltaic array in the photovoltaic power plant and power factor specified by dispatching. Control strategy of dynamic feedback linearization is adopted. Nonlinear decoupling controller is designed for realizing decoupling control of real-and reactive-power. The cascade PI regulation is proposed to avoid inaccurate parameter estimation which generates the system static error. Simulation is carried out based on the simplified power system with large-scale photovoltaic plant model, the power factor, and solar irradiation, and bus fault are considered for the further research. Its demonstrated that the parameter adjustment of PI controller is simple and convenient, dynamic response of system is transient, and the stability of the inverter control is verified.

scholarly journals Converter Compensation of Reactive Power Consumed by the Induction Generato

2021 ◽  
Vol 57 (1) ◽  
pp. 64-79
Author(s):  
Jarosław Tępiński
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Power Grid ◽  
Reactive Power Compensation ◽  
Induction Generator ◽  
Power Electronic ◽  
Induction Generators ◽  
Hydropower Plants ◽  
Reactive Power Compensator ◽  
Power Electronic Converter

Purpose: The purpose of the article is to present a reactive power compensation for small hydropower plants with an induction generator. The classic compensation with capacitors is discussed and its improvement is proposed. Instead of capacitors, a three level power electronic converter connected in parallel to the induction generator can be used to provide reactive power compensation. The purpose of the paper is to present the developed structure of an active compensator and its control method. The developed control method was verified on a laboratory stand. The project and the methods: As part of research, an active compensator was built as a three-level power electronic converter in topology with Neutral Point Clamped. Laboratory tests of a converter compensator were carried out on a stand equipped with an induction generator with a power of 7.5 kW. Laboratory system measurements were made using a power analyzer and an oscilloscope. Results: A control structure of an active compensator based on a voltage-oriented method was presented and discussed. The operation of the con- verter compensator has been verified on a laboratory stand equipped with a 7.5 kW induction generator. The compensator current reduces the reactive (inductive) component of the current consumed from a power grid to a value equal to zero. The reactive power compensator ensures that the tgφ power factor is maintained at a set value of zero, which corresponds to the total compensation of inductive reactive power consumed by an induction generator working in a hydropower plant. Operation of the active compensator did not cause a significant increase in the harmonic content in the current consumed from the power grid. Conclusions: The paper presents the issues regarding reactive power compensation in hydropower plants with induction generators. Commonly used capacitor compensation has been covered and as a result, it is proposed to replace it with power electronics converter compensation of reactive power connected in parallel induction generators. Active compensator provides compensation for the entire reactive power consumed by the induction generator. The use of the converter compensator of reactive power significantly contributes to the reduction of costs for reactive power incurred by the owners of hydropower plants. The reactive power compensator also has a positive impact on the operation of the entire power grid, power losses from the reactive component of the current on the impedances of power grid components are limited. Keywords: renewable source of electricity, reactive power, active compensator, induction generator Type of article: original scientific article

scholarly journals Power factor improvement for a three-phase system using reactive power compensation

2021 ◽  
Vol 24 (2) ◽  
pp. 715
Author(s):  
Majid Ali ◽  
Faizan Rashid ◽  
Saim Rasheed
Keyword(s):  
Power Factor ◽  
Reactive Power ◽  
Capacitor Bank ◽  
Reactive Power Compensation ◽  
Phase System ◽  
Automatic Correction ◽  
Binary Coding ◽  
Three Phase ◽  
Electrical Loads ◽  
Power Factor Improvement

For all industrial and distribution sites, the lagging power factor of electrical loads is a common problem. In the early days, it was corrected manually by adding the capacitor banks of certain values in parallel. Automatic power factor correction (APFC) using a capacitor bank helps to make a power factor that is close to unity. It consists of a microcontroller that processes the value of the power factor to enable the system and monitor the power factor if it falls below (0.77) from the specified level. This paper presents the automatic correction of the power factor by adding the capacitors banks automatically of the desired value in a three-phase system in the form of binary coding (0-7). The main purpose of this system is to maintain the power factor as close as to unity, for the experimental case, it is set to (0.93) which helps to decreases the losses and ultimately increase the efficiency of the system.

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