Robust Global Control Strategies for Improvement of Angular Stability using FACTS and HVDC Devices

2013 ◽  
Vol 14 (1) ◽  
pp. 95-104 ◽  
Author(s):  
P. Agnihotri ◽  
A.M. Kulkarni ◽  
A.M. Gole
Keyword(s):  
Power System ◽  
Control Strategies ◽  
Global Strategy ◽  
Angular Stability ◽  
Area Measurement ◽  
Simplified Model ◽  
Small System ◽  
Measurement Systems ◽  
Preliminary Results ◽  
Circuit Analogy

Abstract System-wide feedback signals made available by Wide-Area Measurement Systems technology can be used in FACTS/HVDC based controllers for the improvement of angular stability. These global signals can facilitate the efficient use of controller effort to stabilize critical swing modes. This paper introduces a restricted global strategy which involves the use of specific global feedback signals which are available at the HVDC/FACTS locations. The strategy is expected to be robust to changes in the power grid as well as communication uncertainties. This paper presents a heuristic introduction to this strategy using a circuit analogy of a simplified model of a power system. Preliminary results on a small system are also presented.

scholarly journals A Three-Stage Procedure for Controlled Islanding to Prevent Wide-Area Blackouts

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3066 ◽  
Author(s):  
Hongbo Shao ◽  
Yubin Mao ◽  
Yongmin Liu ◽  
Wanxun Liu ◽  
Sipei Sun ◽  
...  
Keyword(s):  
Power System ◽  
Dynamic Stability ◽  
Power Flow ◽  
Transient Stability ◽  
Load Shedding ◽  
Area Measurement ◽  
Wide Area ◽  
Measurement Systems ◽  
Controlled Islanding ◽  
Three Stages

Controlled islanding has been proposed as a last resort action to stop blackouts from happening when all standard methods have failed. Successful controlled islanding has to deal with three important issues: when, and where to island, and the evaluation of the dynamic stability in each island after islanding. This paper provides a framework for preventing wide-area blackouts using wide area measurement systems (WAMS), which consists of three stages to execute a successful islanding strategy. Normally, power system collapses and blackouts occur shortly after a cascading outage stage. Using such circumstances, an adapted single machine equivalent (SIME) method was used online to determine transient stability before blackout was imminent, and was then employed to determine when to island based on transient instability. In addition, SIME was adopted to assess the dynamic stability in each island after islanding, and to confirm that the chosen candidate island cutsets were stable before controlled islanding was undertaken. To decide where to island, all possible islanding cutsets were provided using the power flow (PF) tracing method. SIME helped to find the best candidate islanding cutset with the minimal PF imbalance, which is also a transiently stable islanding strategy. In case no possible island cutset existed, corresponding corrective actions such as load shedding and critical generator tripping, were performed in each formed island. Finally, an IEEE 39-bus power system with 10 units was employed to test this framework for a three-stage controlled islanding strategy to prevent imminent blackouts.

A power system build-up restoration method based on wide area measurement systems

2010 ◽  
Vol 21 (1) ◽  
pp. 712-720 ◽  
Author(s):  
S. A. Nezam-Sarmadi ◽  
S. Nourizadeh ◽  
S. Azizi ◽  
R. Rahmat-Samii ◽  
A. M. Ranjbar
Keyword(s):  
Power System ◽  
Area Measurement ◽  
Wide Area ◽  
Measurement Systems ◽  
Restoration Method

Power System Oscillation Modes Identifications: Guidelines for Applying TLS-ESPRIT Method

2013 ◽  
Vol 14 (1) ◽  
pp. 57-66 ◽  
Author(s):  
Gopal R. Gajjar ◽  
Shreevardhan Soman
Keyword(s):  
Power System ◽  
Oscillation Mode ◽  
Area Measurement ◽  
Wide Area ◽  
Mode Identification ◽  
Measurement Systems ◽  
Electromechanical Oscillations ◽  
Direct Observations ◽  
Oscillation Modes ◽  
Selection Of

Abstract Fast measurements of power system quantities available through wide-area measurement systems enables direct observations for power system electromechanical oscillations. But the raw observations data need to be processed to obtain the quantitative measures required to make any inference regarding the power system state. A detailed discussion is presented for the theory behind the general problem of oscillatory mode indentification. This paper presents some results on oscillation mode identification applied to a wide-area frequency measurements system. Guidelines for selection of parametes for obtaining most reliable results from the applied method are provided. Finally, some results on real measurements are presented with our inference on them.

scholarly journals Latencies in Power Systems: A Database-Based Time-Delay Compensation for Memory Controllers

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 208
Author(s):  
Alexander Molina-Cabrera ◽  
Mario A. Ríos ◽  
Yvon Besanger ◽  
Nouredine Hadjsaid ◽  
Oscar Danilo Montoya
Keyword(s):  
Time Delay ◽  
Power Systems ◽  
Time Delays ◽  
Closed Loop ◽  
Control Strategies ◽  
Area Measurement ◽  
Delay Compensation ◽  
Measurement Systems ◽  
Tie Lines ◽  
Time Delay Compensation

Time-delay is inherent to communications schemes in power systems, and in a closed loop strategy the presence of latencies increases inter-area oscillations and security problems in tie-lines. Recently, Wide Area Measurement Systems (WAMS) have been introduced to improve observability and overcome slow-rate communications from traditional Supervisory Control and Data Acquisition (SCADA). However, there is a need for tackling time-delays in control strategies based in WAMS. For this purpose, this paper proposes an Enhanced Time Delay Compensator (ETDC) approach which manages varying time delays introducing the perspective of network latency instead dead time; also, ETDC takes advantage of real signals and measurements transmission procedure in WAMS building a closed-loop memory control for power systems. The strength of the proposal was tested satisfactorily in a widely studied benchmark model in which inter-area oscillations were excited properly.

Optimal Design of Wide Area Based on Fuzzy Controller and Intelligent Method

2017 ◽  
Vol 27 (03) ◽  
pp. 449-473 ◽  
Author(s):  
Saeed Setayeshi ◽  
Vahid Bairami Rad ◽  
Alireza Noruzi ◽  
Nasser Yousefi
Keyword(s):  
Power Systems ◽  
Power System ◽  
New England ◽  
Fuzzy Controller ◽  
Controller Design ◽  
Area Measurement ◽  
Wide Area ◽  
Nonlinear Controller ◽  
Measurement Systems ◽  
Interconnected Power Systems

Recently, the controller using wide-area measurement systems (WAMS) signals has been proposed by researchers. But, an unavoidable delay before the wide-area signals exists which is received by the controller. Accordingly, a delay-independent robust control problem of large interconnected power systems is presented based on the hybrid fuzzy controller for wide area measurement. A fuzzy controller is a nonlinear controller and it is not so sensitive to system topology, parameter and operating condition changes as the conventional ones. According to wide area power system complexity and variation of the loads and network conditions, FPSS has been considered in this paper. Furthermore, the proposed controller has been improved by chaotic version of shark smell optimization algorithm (CSSO) as an optimization problem. Effectiveness of the proposed method has been applied over the 10 machine 39 bus New England power system. Finally, the effectiveness of the proposed controller design methodology is demonstrated through simulation example. Obtained results demonstrate the superiority of the proposed strategy.

Dämpfung von Leistungspendelungen in Energienetzen – Stand der Technik

2018 ◽  
Vol 66 (1) ◽  
pp. 4-18
Author(s):  
Herbert Wohlfarth
Keyword(s):  
Power System ◽  
Area Measurement ◽  
Wide Area ◽  
Power System Stabilizer ◽  
Measurement Systems ◽  
System Stabilizer ◽  
Stand Der Technik

Zusammenfassung Power System Stabilizer (PSS) und netzseitig regelbare Betriebsmittel spielen weltweit eine zentrale Rolle für die dynamische Stabilität von Energieversorgungsnetzen. Der Beitrag beschreibt die Entwicklung gängiger Verfahren zur Dämpfung von Leistungspendelungen, die wesentlichen Erkenntnisse zum Reglerdesign, zu Wechselwirkungen zwischen den beteiligten Komponenten und zu Optimierungsansätzen sowie den Stand der Implementierungspraxis. Darüber hinaus werden besondere Anforderungen an Wide Area Measurement Systems vorgestellt. Auch wird die aktuelle Methodenvielfalt und daraus resultierend die Notwendigkeit einer standardisierten Vergleichbarkeit innovativer Konzepte verdeutlicht.

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