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.

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.

scholarly journals An Accurate Method for Delay Margin Computation for Power System Stability

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3466 ◽  
Author(s):  
Ashraf Khalil ◽  
Ang Swee Peng
Keyword(s):  
Time Delay ◽  
Power Systems ◽  
Power System ◽  
System Stability ◽  
Area Measurement ◽  
Power System Stabilizer ◽  
Iteration Algorithm ◽  
Measurement Units ◽  
System Stabilizer ◽  
Delay Margin

The application of the phasor measurement units and the wide expansion of the wide area measurement units make the time delay inevitable in power systems. The time delay could result in poor system performance or at worst lead to system instability. Therefore, it is important to determine the maximum time delay margin required for the system stability. In this paper, we present a new method for determining the delay margin in the power system. The method is based on the analysis in the s-domain. The transcendental time delay characteristics equation is transformed to a frequency dependent equation. The spectral radius is used to find the frequencies at which the roots cross the imaginary axis. The crossing frequencies are determined through the sweeping test and the binary iteration algorithm. A single machine infinite bus system equipped with automatic voltage regulator and power system stabilizer is chosen as a case study. The delay margin is calculated for different values of the power system stabilizer (PSS) gain, and it is found that increasing the PSS gain decreases the delay margin. The effectiveness of the proposed method has been proved through comparing it with the most recent published methods. The method shows its merit with less conservativeness and fewer computations.

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.

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