Abstract:This paper reviews the basics of series compensation in transmission systems through a literature survey. The benefits that this technology brings to enhance the steady state and dynamic operation of power systems are analyzed. The review outlines the evolution of the series compensation technologies, from mechanically operated switches to line- and self-commutated power electronic devices, covering control issues, different applications, practical realizations, and case studies. Finally, the paper closes with… Show more
“…Mathematically, the establishment process should be nonlinear differential equations, covering the entire process of establishment in general, the solutions of which should reflect the specified gradual decrease in speed and increase in amplitude. However, due to the lack of any general methods for integrating nonlinear differential equations, it is necessary to search for such approximate methods that, to some extent, reflect the physical picture of the processes under consideration [15][16][17][18].…”
Section: Establishment Processes In a Saturated Machinementioning
confidence: 99%
“…If the power transmitted through the EHV (extra high voltage) line is less than the natural one, and the length of the power transmission is less than a half-wave, then there will be an excess of reactive power in the line and its flows will be directed from the line [13][14][15][16]. This can lead to increased voltage levels that can exceed the highest operating and short-term allowable values.…”
Section: Development Of Measures To Prevent Self-excitation Of Genera...mentioning
confidence: 99%
“…When solving problems of the operational control of EPS, after assessing the state, for example, using software complexes [16][17][18], as a rule, operational optimization of the current mode in terms of voltage and reactive power is carried out. At the same time, in the existing optimization programs, to take into account the power losses for the corona, the recommendations given in [19][20][21] are followed and the typical dependences of the power losses for the corona on the voltage levels (∆P k = f (U)) for various brands of wires and certain typical weather conditions are obtained.…”
Section: Structural and Parametric Identification Of The Dependences ...mentioning
The method of operative determination of active power losses (both loading and crown) in alternating current lines has been improved. The proposed technique allows monitoring of active power losses in lines. Based on the comparative analysis of different approximation methods, the most effective method of analytical representation of regression dependences of active power losses on the corona on voltage for different weather conditions is proposed. The validity and reliability of scientific statements, conclusions, and recommendations given in the dissertation are confirmed by the analysis of the results of comparative calculations performed for different models. The efficiency of the developed algorithms and programs was tested on control examples with reference source data, where the results of the calculations were compared with the results obtained by standard programs. The developed technique of operative determination of losses of active power (loading and on a crown) allows one to carry out current monitoring of losses and passive parameters of high-voltage power lines of alternating current. The phenomena of self-excitation of generators connected to unloaded power lines are considered at great length. A physical analysis of the ongoing processes is given, and calculation methods are proposed that have been experimentally tested on a dynamic model. The paper takes into account the effect of the wire corona on the conditions of self-excitation of generators with the necessary developments to prevent this negative phenomenon in the main electrical network. Models and methods have been developed for evaluating the effect of the wire corona on the conditions for the occurrence of self-excitation in ultra-high voltage transmission lines.
“…Mathematically, the establishment process should be nonlinear differential equations, covering the entire process of establishment in general, the solutions of which should reflect the specified gradual decrease in speed and increase in amplitude. However, due to the lack of any general methods for integrating nonlinear differential equations, it is necessary to search for such approximate methods that, to some extent, reflect the physical picture of the processes under consideration [15][16][17][18].…”
Section: Establishment Processes In a Saturated Machinementioning
confidence: 99%
“…If the power transmitted through the EHV (extra high voltage) line is less than the natural one, and the length of the power transmission is less than a half-wave, then there will be an excess of reactive power in the line and its flows will be directed from the line [13][14][15][16]. This can lead to increased voltage levels that can exceed the highest operating and short-term allowable values.…”
Section: Development Of Measures To Prevent Self-excitation Of Genera...mentioning
confidence: 99%
“…When solving problems of the operational control of EPS, after assessing the state, for example, using software complexes [16][17][18], as a rule, operational optimization of the current mode in terms of voltage and reactive power is carried out. At the same time, in the existing optimization programs, to take into account the power losses for the corona, the recommendations given in [19][20][21] are followed and the typical dependences of the power losses for the corona on the voltage levels (∆P k = f (U)) for various brands of wires and certain typical weather conditions are obtained.…”
Section: Structural and Parametric Identification Of The Dependences ...mentioning
The method of operative determination of active power losses (both loading and crown) in alternating current lines has been improved. The proposed technique allows monitoring of active power losses in lines. Based on the comparative analysis of different approximation methods, the most effective method of analytical representation of regression dependences of active power losses on the corona on voltage for different weather conditions is proposed. The validity and reliability of scientific statements, conclusions, and recommendations given in the dissertation are confirmed by the analysis of the results of comparative calculations performed for different models. The efficiency of the developed algorithms and programs was tested on control examples with reference source data, where the results of the calculations were compared with the results obtained by standard programs. The developed technique of operative determination of losses of active power (loading and on a crown) allows one to carry out current monitoring of losses and passive parameters of high-voltage power lines of alternating current. The phenomena of self-excitation of generators connected to unloaded power lines are considered at great length. A physical analysis of the ongoing processes is given, and calculation methods are proposed that have been experimentally tested on a dynamic model. The paper takes into account the effect of the wire corona on the conditions of self-excitation of generators with the necessary developments to prevent this negative phenomenon in the main electrical network. Models and methods have been developed for evaluating the effect of the wire corona on the conditions for the occurrence of self-excitation in ultra-high voltage transmission lines.
“…In the TCSC the capacitive impedance, , is constant and the amount of reactance, ( ), is adjusted by the firing angle of the thyristors. Accordingly, the impedance of the TCSC is as follows [10,79]:…”
In recent decades, various types of control techniques have been proposed for use in power systems. Among them, the use of a proportional–integral–derivative (PID) controller is widely recognized as an effective technique. The generalized type of this controller is the fractional-order PID (FOPID) controller. This type of controller provides a wider range of stability area due to the fractional orders of integrals and derivatives. These types of controllers have been significantly considered as a new approach in power engineering that can enhance the operation and stability of power systems. This paper represents a comprehensive overview of the FOPID controller and its applications in modern power systems for enhancing low-frequency oscillation (LFO) damping. In addition, the performance of this type of controller has been evaluated in a benchmark test system. It can be a driver for the development of FOPID controller applications in modern power systems. Investigation of different pieces of research shows that FOPID controllers, as robust controllers, can play an efficient role in modern power systems.
“…The TCSC characteristic and its operational mode are very well explained in [26,27]. For faulty conditions, TCSC controller system reacts rapidly to take preventive measures and TCSC operates under different modes depending on the fault type.…”
Section: Thyristor-controlled Series Compensator (Tcsc)mentioning
A two-fold adaptive dynamic quadrilateral relay is developed in this research for protecting Thyristor-Controlled Series Compensator (TCSC)-compensated transmission lines (TLs). By investigating a new tilt angle and modifying the Takagi method to recognize the fault zone identifier, the proposed relay adapts its reactive reach and resistive reach separately and independently. The investigated tilt angle and identified fault zone use the TCSC reactance to compensate its effect on the TL parameters and system homogeneity. Excessive tests are simulated by MATLAB on the non-homogenous network, IEEE-9 bus system and further tests are carried out on IEEE-39 bus system in order to generalize and validate the efficiency of the proposed approach. The designed trip boundaries are able to detect wide range of resistive faults under all TCSC modes of operations. The proposed approach is easy to implement as there no need for data synchronization or a high level of computation and filtration. Moreover, the proposed adaptive dynamic relay can be applied for non-homogeneity systems and short as well as long TLs which are either TCSC-compensated or -uncompensated TLs.
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