Application of a Static VAR System to Regulate System Voltage in Western Nebraska
TL;DR: In this article, a Static Var System (SVS) was used to provide automatic, continuous voltage control on a 115 kV network in western Nebraska. But, the SVS was not designed for continuous voltage regulation.
Abstract: Basin Electric Power Cooperative will commission a Static Var System (SVS) in late 1977 to provide automatic, continuous voltage control on a 115 kV network in western Nebraska. This paper describes engineering studies which were conducted to select the SVS rating and site, determine harmonic filtering requirements, synthesize the SVS voltage regulator characteristics and to simulate the steady-state and dynamic performance of the SVS. The studies have shown that the SVS will perform as intended to regulate the steady-state voltage within ±0.5% and reduce post-fault voltage swings which otherwise might cause important motor loads to trip off line.
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TL;DR: In this article, the authors reviewed literature on using high speed thyristor based control of HVAC power system elements to enhance the power carrying capacity of existing transmission circuits without compromising reliability.
Abstract: The paper reviews literature which addresses the application of Flexible AC Transmission System (FACTS) concepts to the improvement of Power System utilisation and performance. It summarises literature on using high speed thyristor based control of HVAC power system elements to enhance the power carrying capacity of existing transmission circuits without compromising reliability. It describes a study system representative of existing power systems that has been developed to evaluate the economic and technical issues of loading transmission lines to their thermal limits. Considered are two scenarios, a multi-line corridor and a long radial interconnection, where the issues addressed are transient and dynamic stability, power flow control, reactive support and voltage stability. A benchmark system is developed to validate performance of die more simple devices. It is concluded that FACTS devices have the potential to significantly increase system stability margins thereby increasing loading capabil...
544 citations
TL;DR: In this article, a robust controller for a static VAr compensator (SVC) to improve the damping of a power system is presented. But the design of the robust controller is not addressed in this paper.
Abstract: The design of a robust controller for a static VAr compensator (SVC) to improve the damping of a power system is presented. The main contributions of the paper are to formulate and to solve the power system damping control problem using robust optimization techniques, and to synthesize the controller with explicit consideration of the system operating condition variations. Nonlinear simulations using the PSCAD/EMTDC software packages have been conducted to evaluate the performance of the closed-loop system. The results have indicated that the designed controller can provide positive damping to the system under a wide range of operating conditions.
146 citations
TL;DR: In this article, the operating and performance characteristics of two basic types of static, thyristor-controlled shunt compensators, one with a fixed capacitor bank and the other with synchronously switchable capacitor banks, are presented with regard to power transmission system applications.
Abstract: The operating and performance characteristics of two basic types of static, thyristor-controlled shunt compensators, one with a fixed capacitor bank and the other with synchronously switchable capacitor banks, are presented with regard to power transmission system applications. The operating principles, and the similarities and differences between the performance of the two schemes are discussed in the areas of steady-state voltage versus VAR characteristic, behavior under small and large system disturbances, harmonic generation, and loss versus output VAR characteristic.
96 citations
Cites background from "Application of a Static VAR System ..."
...Heretofore, static, solid-state VAR compensators as usedfortransmission linecompensation usually employed thyristor-controlled reactors inconjunction witha fixed or conventionally switched capacitor [1, 2 ,3](fixed capacitor, thyristor-controlled reactor- FC-TCR - scheme)....
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TL;DR: In this paper, the application of static reactive compensators (SVCs) to power transmission systems is discussed, and it is shown that SVCs can provide significant benefits in terms of increased transient stabilty and improved damping for synchronizing power flow oscillations.
Abstract: This paper concerns the application of static reactive compensators (SVCs) to Power transmission systems. Emphasis is placed on stability, and it is shown that SVCs can provide significant benefits in terms of increased transient stabilty liisand improved damping for synchronizing power flow oscillations. The paper includes descriptions Of static VAR compensators, with technical and economic comparisons of different compensators. An SVC system study model is presented which includes provision for modulating reactive compensation in response to a variety of system functions. Study procedures are illustrated which relate sYstem stability objectives to general specifications of SVCs, indluding their locations, regulating slopes, peak reactive power requirements, and modulation control.
87 citations
TL;DR: In this article, the design of a static voltampere reactive (VAr) controller using a novel adaptive scheme is investigated, which makes use of self-tuning proportional-integral-derivative (PID) control, can provide better damping characteristics than a fixed-gain PID control SVC over a wide range of operating conditions.
Abstract: Design of a static voltampere reactive (VAr) controller (SVC) using a novel adaptive scheme is investigated. The proposed controller, which makes use of self-tuning proportional-integral-derivative (PID) control, can provide better damping characteristics than a fixed-gain PID control SVC over a wide range of operating conditions. The system considered is a synchronous generator connected to an infinite bus through a double circuit transmission line. Digital simulations of the system following a three-phase fault under different loading conditions were performed to demonstrate the robustness and effectiveness of the controller. >
87 citations
References
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01 Jan 1975
TL;DR: In this article, two basic approaches have been used to control power system voltage and VARs at locations remote from the generating station, one approach is to change the transformer ratio by means of tapchangers, and the other is to supply either leading or lagging VARS as required by the system to obtain the desired voltage.
Abstract: Control of power system voltage and VARs are important problems which constantly receive and deserve careful study by utility engineers Two basic approaches have been used to control systems voltage at locations remote from the generating station One approach is to change the transformer ratio by means of tapchangers, and the other is to supply either leading or lagging VARs as required by the system to obtain the desired voltage
7 citations
Additional excerpts
...The predominant harmonic currents generated during balanced three phase operation of the thyristor controller are shown in Table I [5,6]....
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