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Cibatu34-Mandirancan is one of the most important subsystem in Jawa Bali system. Peak Load of this subsystem is about 1.700 MW, several industrial costumers are also located here. On 13th March 2014 disturbance occured on Indramayu-Kosambibaru. This disturbance was followed by tripping of two transmission lines and all generators in Indramayu Power Plant. Disturbance Fault Recorder (DFR) data showed...
Transmission line congestion is a critical factor that will affect power system operational cost. With more renewable energy in the future grid and the intermittence of nature, transmission line congestion will be more frequent. Due to the congestion, renewable plant has to curtail some available generation. This paper investigates the use of active transmission line switching operation in power system...
This paper provides an overview of subsynchronous resonance, subsynchronous torsional interaction, and related phenomena. Beginning with the first, and only, case of shaft damage due to subsynchronous resonance, this paper also describes other types of potential torsional interaction as well as various methods of mitigation and protection. It ends with a description of the most recent concerns about...
The hydrogenerator's self-excitation problem must be taken into consideration seriously in the process of charging no-load long transmission line when implementing black-start for the important power plant in a regional power network which occurs blackout. This paper we propose a new way to simulate the unit's self-excitation when charging no-load long line with the use of Power System Analysis Software...
This article presents an analysis of the behavior of the electrical frequency in Caracas during four major events of the year 2008. The frequency was computed from the voltage signals of the fault recorders. The events of April 29 and September 01 were faults in transmission lines of the National Grid, and the event of October 19 was the erratic trip of two main lines at 765kV (Guri-Malena). In these...
In this paper, the performance of distance relays when applied to transmission system equipped with shunt FACTS device, Static Synchronous Compensator (STATCOM) is described. The aim of the proposed study is to evaluate the performance of distance relays when STATCOM is incorporated at the mid point of transmission lines for voltage control. A detailed model of STATCOM and its control strategy is...
This paper presents a fast and accurate method to determine the available transfer capability. The Ralston's method is used to predict the two trajectory points of voltage magnitude, power flow and maximum generator rotor angle difference. Then, the cubic-spline interpolation technique is used to accurately trace the P-V, P-S or P-Δδ curves between two points of trajectory. The P-V, P-S and P-Δδ curves...
This paper presents a fast and accurate method to determine the available transfer capability. The Ralston's method is used to predict the two trajectory points of voltage magnitude, power flow and maximum generator rotor angle difference. Then, the cubic-spline interpolation technique is used to accurately trace the P-V, P-S or P-Δδ curves between two points of trajectory. The P-V, P-S and P-Δδ curves...
This communication presents preliminary results of examining a full-wave approach based upon the method-of-moments combined with an adaptive frequency sampling and Stoer-Bulirsch rational approximation algorithm as a tool for a wideband frequency-domain transient analysis of a multiconductor transmission line driven by a lumped voltage source and simultaneously exposed to external electromagnetic...
This paper presents a fast and accurate method to determine the available transfer capability. The Ralston's method is used to predict the two trajectory points of voltage magnitude, power flow and maximum generator rotor angle difference. Then, the cubic-spline interpolation technique is used to accurately trace the P-V, P-S or P- ?? ?? curves between two points of trajectory. The P-V, P-S and P-??...
A novel construction method of decentralized systems for bulk power system is proposed. Firstly, a bulk power system is exactly rewritten into a one-machine one-load decentralized system by the power flow calculation at each generator-bus, and the one-machine one-load system with a middle load is also rewritten into an equivalent system without the middle one. Next, a three-machine and a longitudinal...
The first 1000 kV ultra high voltage (UHV) AC transmission line, connecting central China GridGrid (CCG) and north China Grid (NCG), is being constructed in China. It is necessary and important to analyze the stability of the system with the first 1000 kV UHV AC line. Some new challenges and problems would be found and need a theoretical explain. In this paper, the new instable problems caused by...
Based on the transient energy function (TEF) theory with classical models considered, the optimal re-closing time (ORT) can be calculated accurately. This paper mainly focuses attention on the validity and practicability analyzing of ORT obtained from this method. Firstly, the characteristics and influencing factors of the ORT are put forward and analyzed, and also the setting strategy of re-closing...
At stressed operating conditions, critical contingencies can initiate loss of synchronism and trigger cascading events. Controlled islanding is the last line of defense to stabilize the whole system. This paper presents a decision tree assisted scheme to determine the timing of controlled islanding in real time by using phasor measurements. In addition, a slow coherency based approach is used to determine...
This paper discusses the feasibility of three-phase switching of six-phase lines for single phase-to-ground faults as a protection scheme. To apply such scheme, it is necessary that the transient stability, extinction of secondary arc current, thermal duty of nearby generators and torsional torques induced on the shaft of turbine-generators are investigated and compared with single-pole switching...
A novel supplementary subsynchronous damping controller (SSDC) is proposed for the generator excitation system which is capable of damping out subsynchronous oscillations in power systems with series compensated transmission lines. The offered SSDC uses a filtered feedback from generator acceleration power signal and after passing through a proportional gain it is added to automatic voltage regulator...
Evolutionary Programming incorporating neural network (EPNN) is proposed to obtain the solution of Transient Stability Constrained Optimal Power Flow (TSCOPF) in this paper. Evolutionary Programming (EP) is selected as a main optimizer while the neural network is a supplementary tool to enhance the computational speed by screening out individuals, which have very high or low degrees of stability....
The re-closing time of a transmission line has a distinct influence on power system transient stability. There is an optimal re-closing time (ORT) for all transmission line faults, no matter the instantaneous fault or permanent one. Based on the transient energy function (TEF) theory with classical models considered, the ORT can be calculated accurately. This paper mainly focuses attention on the...
Investigations of recent blackouts indicate that the root cause of almost all major power system disturbances is voltage collapse rather than the underfrequency conditions prevalent in the blackouts of the 1960s and '70s. This paper explores the nature of recent power system blackouts (2003 east coast, 1996 California and others) and explains why voltage is the leading edge indicator of impending...
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