scholarly journals VAR Compensation on Load Side using Thyristor Switched Capacitor and Thyristor Controlled Reactor

2021 ◽  
Vol 16 (1) ◽  
pp. 111-119
Author(s):  
Bibek Bimali ◽  
Sushil Uprety ◽  
Ram Prasad Pandey
Keyword(s):  
Power Systems ◽  
Reactive Power ◽  
Voltage Drop ◽  
Switched Capacitor ◽  
Supply Source ◽  
Efficient Management ◽  
Ac Power ◽  
Thyristor Controlled Reactor ◽  
Var Compensation ◽  
Inductive Reactance

Generally, AC loads are the inductive loads which are reactive in nature. These loads, thus, demand and draw reactive power from the supply source. If these loads draw large lagging current from the source, this will cause excessive voltage drop in the line, which can even cause the voltage collapsing in the line itself if the drop in the line is excessively high. VAR compensation means efficient management of reactive power locally to improve the performance of AC power systems. In this paper, Static VAR Compensator, using TSC (Thyristor Switched Capacitor) and TCR (Thyristor Controlled Reactor), is designed and simulated in MATLAB to maintain the power factor of power system nearly to unity at all times. TSC and TCR are basically shunt connected capacitors and inductor respectively whose switching (of capacitors) and firing angle control (of inductor) operations are carried out using thyristors. The purpose of capacitors is to supply lagging VAR as per the demand by the connected loads and the overcompensation due to excess VAR generated by the discrete set of turned on capacitors are absorbed by the adjustable inductive reactance of the inductor in TCR branch through firing angle control mechanism.

scholarly journals Demodulation of Three-Phase AC Power Transients in the Presence of Harmonic Distortion

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2341
Author(s):  
Benjamin T. Gwynn ◽  
Raymond de Callafon
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Reactive Power ◽  
Harmonic Distortion ◽  
Transient Effects ◽  
Active And Reactive Power ◽  
Reactive Power Flow ◽  
Ac Power ◽  
Rlc Circuit ◽  
Smart Inverters

Load switches in power systems may cause oscillations in active and reactive power flow. Such oscillations can be damped by synthetic inertia provided by smart inverters providing power from DC sources such as photovoltaic or battery storage. However, AC current provided by inverters is inherently non-sinusoidal, making measurements of active and reactive power subject to harmonic distortion. As a result, transient effects due to load switching can be obscured by harmonic distortion. An RLC circuit serves as a reference load. The oscillation caused by switching in the load presents as a dual-sideband suppressed-carrier signal. The carrier frequency is available via voltage data but the phase is not. Given a group of candidate signals formed from phase voltages, an algorithm based on Costas Loop that can quickly quantify the phase difference between each candidate and carrier (thus identifying the best signal for demodulation) is presented. Algorithm functionality is demonstrated in the presence of inverter-induced distortion.

Vehicle Engineering Application Study on TSF Var Compensation Method for Electric Locomotive of Electrified Railway

2011 ◽  
Vol 299-300 ◽  
pp. 1186-1189
Author(s):  
Ling Wei ◽  
Jing Shuai Xiao ◽  
Yu Lin Dong
Keyword(s):  
Power Systems ◽  
Engineering Application ◽  
Modern Society ◽  
Compensation Method ◽  
Theory And Practice ◽  
Electric Locomotive ◽  
Vehicle Engineering ◽  
Ac Power ◽  
Electrified Railway ◽  
Var Compensation

The application of electric power, which acts as a pillar energy and economic artery in modern society, is one of the most important symbols of the level of development and comprehensive national power of a country. Var is a crucial factor for the design and operation of AC power systems, and is closely bound up with the safety, stabilization, and economical operation of power systems. With the development of electrified railway, developing the var compensation strategy vigorously has important senses in theory and practice. In this article, synthetically considering technique and economic leval of power systems in our country, parameters design and verification and specific engineering application of TSF var compensation method are presented. This method is a preferable one for resolving undesirable effect on power systems of electrified railway, especially having dynamic and real time characteristics of var compensation.

Harmonic Analysis of Three-phase Fixed Capacitor–thyristor Controlled Reactor under Balanced and Unbalanced Conditions

2018 ◽  
Vol 7 (1) ◽  
pp. 67
Author(s):  
Jayababu Badugu ◽  
Y. P.Obulesu ◽  
Ch. Saibabu
Keyword(s):  
Power Systems ◽  
Harmonic Analysis ◽  
Reactive Power ◽  
High Reliability ◽  
Voltage Waveform ◽  
Current Harmonics ◽  
Three Phase ◽  
Harmonic Filter ◽  
Harmonic Pollution ◽  
Thyristor Controlled Reactor

Three-phase Fixed Capacitor Thyristor Controlled Reactor is widely used for reactive power compensation in power systems because of reduced cost and high reliability.  The problem with FC-TCR is that to generate current harmonics when it is partially conducting. When this harmonic current is interacted with system impedance, voltage waveform will distorted. This harmonic pollution is undesirable in power systems. Therefore, it is important to know the harmonic behaviour of three-phase FC-TCR before they can be used in a power system network. This paper presents the harmonic analysis of three-phase FC-TCR operating under balanced and unbalanced conditions. This analysis is useful to design the harmonic filter to reduce the harmonic pollution in power systems.The proposed work is implemented in MATLAB environment.

scholarly journals Fast Heuristic AC Power Flow Analysis with Data-Driven Enhanced Linearized Model

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3308
Author(s):  
Xingpeng Li
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Flow ◽  
Flow Model ◽  
Reactive Power ◽  
Unit Commitment ◽  
Flow Analysis ◽  
Data Driven ◽  
Dc Power ◽  
Ac Power

Though the full AC power flow model can accurately represent the physical power system, the use of this model is limited in practice due to the computational complexity associated with its non-linear and non-convexity characteristics. For instance, the AC power flow model is not incorporated in the unit commitment model for practical power systems. Instead, an alternative linearized DC power flow model is widely used in today’s power system operational and planning tools. However, DC power flow model will be useless when reactive power and voltage magnitude are of concern. Therefore, a linearized AC (LAC) power flow model is needed to address this issue. This paper first introduces a traditional LAC model and then proposes an enhanced data-driven linearized AC (DLAC) model using the regression analysis technique. Numerical simulations conducted on the Tennessee Valley Authority (TVA) system demonstrate the performance and effectiveness of the proposed DLAC model.

Comprehensive Compensation System Based on CS-APF and SVC

2014 ◽  
Vol 635-637 ◽  
pp. 1418-1421
Author(s):  
Yu Qing Lin ◽  
Mao Fa Gong ◽  
Hui Ting Ge ◽  
Bing Qian Liu ◽  
Ning Xia Yang
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Feedforward Control ◽  
Compensation System ◽  
Harmonic Compensation ◽  
Harmonic Currents ◽  
Thyristor Controlled Reactor ◽  
Simulation Results ◽  
Var Compensation

A unified control method of comprehensive compensation system based on CS- APF and SVC is introduced in this paper. SVC is composed of thyristor controlled reactor (TCR) and fixed capacitor (FC). For the CS- APF control, a feedforward control for harmonic compensation of SVC and load is applied. The CS- APF is enabled to optimize the var compensation performance of SVC. Finally, the simulation results show that the system can effectively compensate reactive power and eliminate harmonic currents.

scholarly journals A Novel Methodology for Optimal SVC Location Considering N-1 Contingencies and Reactive Power Flows Reconfiguration

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6652
Author(s):  
Diego Carrión ◽  
Edwin García ◽  
Manuel Jaramillo ◽  
Jorge W. González
Keyword(s):  
Power Systems ◽  
Large Scale ◽  
Reactive Power ◽  
Voltage Profile ◽  
Expansion Planning ◽  
Transmission Expansion Planning ◽  
Transmission Expansion ◽  
Ac Power ◽  
The Stability ◽  
Line Switching

In this research, an alternative methodology is proposed for the location of Static VAR Compensators (SVC) in power systems, considering the reconfiguration of reactive power flows through the optimal switching of the transmission stage, which resembles the contingency restriction N-1 usually considered in transmission expansion planning. Based on this methodology, the contingency index was determined, which made it possible to determine which is the contingency that generates the greatest voltage degradation in the system. For the quantification of reactive flows, optimal AC power flows were used, which minimize the operating costs of the power system subject to transmission line switching restrictions, line charge-ability, voltages and node angles. To determine the node in which the compensation should be placed, the contingency index criterion was used, verifying the voltage profile in the nodes. The proposed methodology was tested in the IEEE test systems of 9, 14 nodes and large-scale systems of 200, 500 and 2000 bus-bars; to verify that the proposed methodology is adequate, the stability of the EPS was verified. Finally, the model allows satisfactorily to determine the node in which the SVC is implemented and its compensation value.

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.

Sign in / Sign up

Export Citation Format

Share Document