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Obecność przesuwników fazowych w strukturze układu sieciowego sprawia, że warunki pracy sieci podczas zwarć niesymetrycznych mogą odbiegać od „klasycznych”, znanych z układu bez przesuwników fazowych. Przesuwnik fazowy może tak „przenosić” zwarcie na drugą stronę, że rozkład parametrów prądów fazowych po obu stronach przesuwnika będzie nieidentyczny.
A novel, fast and reliable distance relay approach is proposed in this work to detect fault during power swing. First of all, the voltage and current at relay end is measured and then processed using phasor estimation technique. Next, average of three phase active power is estimated and based on the magnitude of the calculated value the swing and different fault cases can be discriminated. During...
The electricity is the basic need of living nowadays. The reliable supply is essential to satisfy the reliable operation of electricity. This paper presents the fuzzy logic based protection scheme for detection and classification of shunt faults in a three phase series compensated transmission line. A 735 kV, 60 Hz series compensated three phase single circuit transmission lines has been simulated...
The Hilbert-Huang Transform (HHT) is used for time-frequency analysis of non-stationary and non-linear signals, e.g., power signals. In this paper, we propose a fault detection method for electric power system using the HHT. The presented numerical example shows the implementation of HHT on unsymmetrical phase voltages to detect the occurrence time of a single line to ground fault at a particular...
Presence of Distributed generators (DGs) in the Distribution network using overcurrent relays for protect the Distribution network is a challenging task because of the changes in fault current levels and reverse power flow. Especially, in the presence of current limited converter interfaced DGs, using overcurrent relays are may fail to detect and isolate the faulty section while it is grid connected...
Since low voltage ride-through (LVRT) was proposed, its improvements have never been stopped, especially the improvements for operation under unbalanced faults. In this paper, an overall control strategy is proposed to solve the problem that the output current quality and dc-link voltage quality cannot be guaranteed at the same time. For this propose, a current control method is employed to guarantee...
Due to massive increase in prices of fossil fuels as well as alarming rate of environmental pollution, researchers and scientists are paying good number of attentions towards sustainable energy and technology. Among various sources of renewable energy, fuel cell technology is becoming quite popular now a days. A comprehensive analysis of fuel cell generation and stability enhancement has been presented...
Fault detection has been in the top priority in power system at it's the initial state of isolating system under fault and its process of correcting. The wavelets have been used for this purpose much earlier. This paper analyses various unsymmetrical faults in power system using Morlet wavelet and various impacts of faults current and voltage. Further it analysis various ways of preventing faults...
The distribution power system maintains its steady state mainly because of the correct and quick remedial action taken by the protective relaying equipment. Transient currents due to fault and switching events are common in power system. The operation of protective relay for transient due to switching condition is undesirable. The method of symmetrical components provides a technology for understanding...
In this paper, the transient characteristics of double-fed induction generator (DFIG) are analyzed. Based on this, the fault current contribution of DFIG with and without crowbar are compared. Comparison result shows that fault current of DFIG under different ride-through conditions differs widely from each other. Under unsymmetrical fault, the DFIG with a crowbar is converted to squirrel case induction...
This paper presents a new practical backup power supply connection scheme for Distribution Line Non-Communication Protection (DNCP). Simulation tests have been conducted using the Alternate Transient Program (ATP) with respect to a typical single circuit breaker multi-section system. Additional theoretical analysis has also been done in the condition of unsymmetrical fault on L3 to identify the variation...
A Multi-Objective Evolutionary Programming (MOEP) based approach to Static Synchronous Series Compensator (SSSC) has been presented in this paper. The multi-objective optimization problem is formulated to the design problem of SSSC, in which the system transient stability is improved by minimizing several system behavior measure criterions. Then, MOEP is used to design the Flexible Alternating Current...
In this paper a short circuit analysis algorithm for radial three-phase distribution networks, based on two relationship matrices method, is presented. Two relationship matrices, the bus-current-injection-to-branch current matrix and the bus-current-to-bus-voltage matrix are used to represent the special topological characteristics of distribution networks. These two matrices can be accomplished by...
The recent trend of wind power generation is to use variable speed wind turbine (VSWT) driving a doubly fed induction generator (DFIG), or permanent magnet synchronous generator (PMSG). Among them stability analyses of DFIG type of VSWT have already been reported in many literatures. But transient stability analysis for synchronous generator type of VSWT is not sufficient enough. This paper focuses...
In this paper, the stabilization of wind farms connected with multi-machine power system in which a severe network disturbance occurs is analyzed. For this purpose, the STATCOM incorporated with battery energy storage system (BESS), i.e., STATCOM/BESS topology is proposed to enhance the transient stability of entire power system. At each wind farm terminal one PWM based STATCOM/BESS is connected....
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