scholarly journals A New Formulation for Load Flow Solution of Power Systems With Series FACTS Devices

2011 ◽  
pp. 69-73
Author(s):  
P. sravan Kumar ◽  
A. Appa Rao ◽  
Dr. K. Sarat Kumar
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Load Flow ◽  
State Variables ◽  
Flow Equations ◽  
Flexible Ac Transmission ◽  
Facts Devices ◽  
Flow Through ◽  
New Formulation ◽  
Ac Transmission

This paper addresses the solution of load flow equa-tions for a power system with series flexible ac -transmission systems(FACTS) devices. A novel formulation of equations using dual state variables (current magnitude and angle) and dual controlvariables (series injected real power and series voltage in quadra-ture with current) for series devices is proposed. These specifica-tions can be related to transmission line loading and device limits.Specifications like power flow through a series device can also be handled using this formulation. The load flow equations are solved using Newton-Raphson technique. A decoupled formulation is also proposed. Case studies are carried out on IEEE test systems withseveral types of specifications to validate the method.

Power Flow Modeling in Power System With Multiple FACTS Controller

2018 ◽  
pp. 194-209
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Flow ◽  
Phase Shifter ◽  
Unified Power Flow Controller ◽  
Static Synchronous Compensator ◽  
Transmission Systems ◽  
Flow Equations ◽  
Flexible Ac Transmission ◽  
Facts Devices

Flexible AC transmission systems (FACTS) devices are integrated into power system networks to control power flow, increase transmission line capability to its thermal limit, and improve the security of transmission systems. Power flow is an important mathematical calculation for planning, operation, and control of power systems network. The focus of the chapter is to explore how to modify Newton-Raphson power flow method to include various FACTS devices such as static VAR compensator (SVC), static synchronous compensator (STATCOM), static synchronous series compensator (SSSC), thyristor-controlled series capacitor (TCSC), thyristor-controlled phase shifter (TCPS), unified power flow controller (UPFC) controllers. This chapter briefly describes the power flow equations of the aforesaid FACTS-based power system network, and how the conventional power flow calculation is systematically extended to include these controllers is also been discussed.

scholarly journals Robust control of a UPFC system with H~ control technique

2020 ◽  
Vol 18 (1) ◽  
pp. 533 ◽  
Author(s):  
Maamar Benyamina ◽  
Mohamed Bouhamida ◽  
Tayeb Allaoui ◽  
Rachid Taleb ◽  
Mouloud Denai
Keyword(s):  
Robust Control ◽  
Power Flow ◽  
Load Flow ◽  
Control Technique ◽  
Unified Power Flow Controller ◽  
Flexible Ac Transmission ◽  
Facts Devices ◽  
The Stability ◽  
Ac Transmission ◽  
Power Flow Controller

<p>FACTS (Flexible AC Transmission Systems) technology has now been accepted as a potential solution to the stability problem and load flow. The Unified Power Flow Controller (UPFC) is considered to be the most powerful and versatile among all FACTS devices.  This paper presents the control of a UPFC system using Hinf robust control technique. A simulation study using Matlab/Simulink is presented to the performance of this control strategy and the robustness with respect to variations of the system parameters such as the inductance of the transmission line.</p>

Study of Shunt FACTS-Based Controllers Effectiveness on Multi Machine Power System Steady State Operation

2011 ◽  
Vol 403-408 ◽  
pp. 4926-4933
Author(s):  
Laxmidhar Sahu ◽  
Jose. P. Therattil ◽  
P. C. Panda
Keyword(s):  
Power System ◽  
Power Flow ◽  
Load Flow ◽  
Continuous Change ◽  
Flow Models ◽  
Flexible Ac Transmission ◽  
Steady State Operation ◽  
Facts Controllers ◽  
Ac Transmission ◽  
Matlab Programming

The continuous change in power demand and supply altered the power flow patterns in transmission networks in such a way that some of the corridors are lightly loaded and some of the corridors get over loaded. This raises serious challenge in operating the power system in secure and reliable manner. To cope with this problem Flexible AC Transmission Systems (FACTS) is used. It plays a very important role in improving the power system operating performance. In this paper load flow models for STATCOM and SVC have been developed. Power flow study of a five bus system is carried out with and without FACTS controllers. Results of the power flow studies are obtained with MATLAB programming.

A new formulation for load flow solution of power systems with series facts devices

2003 ◽  
Vol 18 (4) ◽  
pp. 1307-1315 ◽  
Author(s):  
U.P. Mhaskar ◽  
A.B. Mote ◽  
A.M. Kulkarni
Keyword(s):  
Power Systems ◽  
Load Flow ◽  
Flow Solution ◽  
Facts Devices ◽  
New Formulation

RELIABILITY MANAGEMENT AND IMPROVEMENT FOR PLANNING AND OPERATIONAL PROCESS ENHANCEMENT MEASURES IN DEREGULATED POWER SYSTEMS USING ATC

2010 ◽  
Vol 17 (03) ◽  
pp. 275-289
Author(s):  
V. VIJAY VENU ◽  
A. K. VERMA
Keyword(s):  
Power Systems ◽  
Planning Horizon ◽  
Available Transfer Capability ◽  
Reliability Management ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Facts Devices ◽  
Transfer Capability ◽  
Ac Transmission ◽  
Deregulated Power Systems

In this paper, beginning with a concise overview of the Available Transfer Capability (ATC) evaluation methods, we make a proposition for reliability management in the planning horizon of deregulated power systems through the concept of Adequacy Resiliency. The derived indices are meant as indicators of adaptability of power systems to ensure the required reliability levels. Improvements to this conceptualization upon the deployment of Flexible AC Transmission System (FACTS) devices are then put forward. We also explore the option of employing the created indices to the operational horizon of power systems, explaining the means of market enhancement. Core reliability issues arising out of the usage of FACTS are then discussed.

scholarly journals Modelling of Transformerless Upfc Toimprovepower System Stability using Optimization Technique

2019 ◽  
Vol 8 (4) ◽  
pp. 11456-11459
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Optimization Technique ◽  
System Stability ◽  
Unified Power Flow Controller ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Facts Devices ◽  
Ac Transmission ◽  
Power Flow Controller

Generally, power system faces the problem to transfer power from one system to another system without any fluctuations, with minimal of system losses. To overcome this problems, a flexible ac transmission system is implemented in this paper. In present scenario, facts devices are used to reduce the transmission losses for improvising transmission capacity and also to improve the system capability. Unified Power Flow Controller plays a most prominent role in FACTS controller to improve the system stability. The structure of UPFC is combination of back-back converters with boosting and zigzag transformer. This type of UPFC system consists of high losses due to presence of magnetic properties in this transformer. With this, a transformer-less multilevel inverter based UPFC topology is proposed in this paper. This paper focuses on the modulation of transformerless UPFC with PSO, which controlsfundamental frequency for better controlling of active and reactive power, harmonic minimization, and improvement in efficiency of system by controlling DC link voltage

scholarly journals Power Quality Services Provided by Virtually Synchronous FACTS

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3292 ◽  
Author(s):  
Andres Tarraso ◽  
Ngoc-Bao Lai ◽  
Gregory N. Baltas ◽  
Pedro Rodriguez
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Electrical Networks ◽  
Efficient Operation ◽  
Flexible Ac Transmission ◽  
Facts Devices ◽  
Voltage Quality ◽  
Critical Issues ◽  
Harmonics Flow ◽  
Ac Transmission

The variable and unpredictable behavior of renewable energies impacts the performance of power systems negatively, threatening their stability and hindering their efficient operation. Flexible ac transmission systems (FACTS) devices are able to emulate the connection of parallel and series impedances in the transmission system, which improves the regulation of power systems with a high share of renewables, avoiding congestions, enhancing their response in front of contingencies and, in summary, increasing their utilization and reliability. Proper control of voltage and current under distorted and unbalanced transient grid conditions is one of the most critical issues in the control of FACTS devices to emulate such apparent impedances. This paper describes how the synchronous power controller (SPC) can be used to implement virtually synchronous FACTS. It presents the SPC functionalities, emphasizing in particular the importance of virtual admittance emulation by FACTS devices in order to control transient unbalanced currents during faults and attenuate harmonics. Finally, the results demonstrate the effectiveness of SPC-based FACTS devices in improving power quality of electrical networks. This is a result of their contribution to voltage balancing at point of connection during asymmetrical faults and the improvement of grid voltage quality by controlling harmonics flow.

Improved Performance of DPFC Using Sliding Mode Controller Method

2016 ◽  
Vol 6 (5) ◽  
pp. 2073 ◽  
Author(s):  
D Narasimha Rao ◽  
T Surnedra ◽  
S Tara Kalyani
Keyword(s):  
Power Systems ◽  
Transmission Lines ◽  
Power Flow ◽  
Sliding Mode ◽  
Flexible Ac Transmission ◽  
Active Power Flow ◽  
Improved Performance ◽  
Bus Voltage ◽  
The Individual ◽  
Ac Transmission

<p>Modern power systems demand the need of active power flow with the help of Power Electronics control devices is needed. In the family of Flexible AC Transmission devices (FACTS), Dynamic PFC (DPFC) offers the same controlling function as Unified PFC (UPFC), comprising the control of transmission angle, bus voltage and line impedance. A technical modification of UPFC is DPFC in which fluctuations of voltage at DC link is eliminated that enables the individual operation as series and parallel controllers. The concept of DFACTS is used in design of the series converter. The replacement of  the  high  rating  three  phase  series  converter with  the multiple low rating single phase converters results in cost reduction and increases reliability greatly. This DC Link is used to transfer the real power between two converters in UPFC such as in DPFC which eliminates the 3rd harmonic frequencies at transmission lines. D-FACTS converters are acting as insulation between high voltage phases acts as 1-ᴓ floating with respect to ground. These results in lower cost for the DPFC system compared to the UPFC. This paper describes the comparison of PI and Sliding Mode Controllers which conclude that SMC is a better control strategy compared to PI.</p>

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