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Increases in system loads and in levels of penetration of renewable energy, together with limited investment in transmission infrastructure, are fostering the need for a smarter and more dynamically controllable grid. Flexible ac transmission systems devices can be used to dynamically control the grid and more efficiently route power and thus mitigate these stresses, but such devices are either too...
Power is a major concern that has generated interest in electrical utilities and consumers. To assure a reliable power system, all the buses are expected to maintain steady acceptable voltage before and after being subjected to any disturbance. Among the FACTs devices a static synchronous compensator,(STATCOM) is analyzed to provide a reliable and feasible solution. This paper presents a comprehensive...
In this paper, a hybrid power flow controller (HPFC) configuration for flexible AC transmission system (FACTS) is evaluated. It consists of a reactive power compensator and two voltage source converters (VSCs). Here the VSCs can exchange power through a common DC circuit. The system is simulated using Electro Magnetic Transients Program - Restructured Version (EMTP-RV). A dynamic control scheme is...
In this paper, the nodal price for real and reactive power considering different reactive power price cost calculation methods for generator reactive power has been presented. The impact of FACTS controllers has also been considered taking their cost function into account. The comparison of fuel costs, reactive power cost, and cost of FACTS devices, and their impact on nodal price determination has...
This paper presents a feedback linearization based controller design methodology for a unified power flow controller (UPFC) to achieve rapid reference signal tracking in the internal level. Feedback linearization control (FBLC) is a nonlinear technique based on differential geometry theory and overcomes the drawback of traditional PI control linearzing at one specific operating condition. FBLC is...
Available Transfer Capability (ATC) is a measure of the remaining power transfer capability of the transmission network for further transactions. Transmission System Operators (TSOs) are encouraged to use the existing facilities more efficiently. Most transfer studies involve contingencies and multipattern scenarios that often can only be performed in reasonable time with the use of linear methods...
In this paper a novel approach to determine optimal location, number and initial compensation level of the SVC in a power system is presented. Mixed Integer Nonlinear Programming (MINLP) is used for this purpose as a useful technique for combinatorial optimization over integers and variables. This technique can provide a fast approach as well as high computational efficiency even in solving complex...
Flexible AC transmission systems (FACTS) is an evolving technology, which can be used to improve power system utilisation. Determining the type, location, device number, and device compensation are critical to successfully utilizing FACTS controllers, and this paper presents a method of Unified Power Flow Controller (UPFC) placement, which is capable of simultaneously determining number of UPFCs,...
The Interline Power Flow Controller (IPFC) among the Flexible AC Transmission Systems (FACTS) is one of the most versatile devices, especially for power flow control of multiline systems. This paper presents a new utilization of IPFC in power systems. In this paper, IPFC is used as an Automatic Generation Control (AGC). In order to obtain this objective, Power Injection Model (PIM) among the other...
Although locational marginal pricing (LMP) plays an important role in many restructured wholesale power markets, the detailed derivation of LMPs as actually used in industry practice is not readily available. This lack of transparency greatly hinders the efforts of researchers to evaluate the performance of these markets. In this paper, different AC and DC optimal power flow (OPF) models are presented...
With further complication of power system, the problem of low frequency oscillations in large electric network becomes more and more serious. Unified power flow controller (UPFC) is the most valuable and universal device in flexible AC power transmission system, which can improve system stability and inhibit low frequency oscillations under proper control. This paper intends to analyze the single-unit...
Static synchronous series compensator (SSSC) is a facts device that can compensate the reactive power of the line and improve the power oscillation damping. The excitation control is a conventional and significant control for the power system stability. This paper presents a new coordinated control scheme between SSSC and the excitation system of generator. First, three-order nonlinear model of generator...
This paper presents a new procedure for power flow calculation of power systems in presence of dynamic flow controller (DFC) which is a new member of FACTS controllers. The focus of the paper is to explore how to systematically extend and modify Newton-Raphson power flow method to include DFC. A new steady state model of DFC is introduced for the implementation of the device in the conventional Newton-Raphson...
Owing to the difficulties in building new generators and transmission facilities to accommodate the regionally increasing load demands, it becomes vulnerable to voltage instability from over-utilization of the existing facilities or any contingency. In addition to installing FACTS devices, a good generation direction (GD) can also alleviate voltage instability and thus increase loading margin (LM)...
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