Investigation of tcsc and sssc controller effects on the power system metin dogan 1, salih tosun, ali ozturk. Thyristor controlled series compensation tcsc is used if fast control of the. Facts controllers in power transmission and distribution. Transmission systems facts facts ac transmission systems incorporating the power electronicbased to enhance controllability and increase power transfer capability. Tcsc control design for transient stability improvement of. A tcsc is a series controlled capacitive reactance that can provide continuous control.
Tcsc, facts, power flow control, power system, modelling of tcsc. Thyristorcontrolled series capacitors tcsc tcsc configurations comprise controlled reactors in parallel with sections of a capacitor bank. Pdf flexible a c transmission and study of tcsc researchgate. Thyristor controlled series compensatorbased controller.
Thyristor controlled series capacitor tcsc installed in transmission line on the inverse. The emerging technology of flexible ac transmission system facts enables planning and operation of power systems at minimum costs, without compromising security. Steadystate modeling of svc and tcsc for power flow analysis. Tcsc series voltage source converter based facts static synchronous compensator statcom shunt. The input signal to these controllers is the speed deviation z. So tcsc is more economic than some other challenging facts technologies. Keywords facts controllers, eigenanal ysis, controller design, system oscillations, power flow, transient stability 1. The controllable reactance x tcsc is directly used as the control variable in the power flow. Performance comparison of tcsc with tcps and sssc controllers. Tcsc controller is carried out and simulation results are presented. Here two types of facts devices has been discussed nemely, thyristor controlled series capacitor tcsc and static var compensator svc for the economic. The paper considers the conventional pid controller and compares its performance with respect to the proposed slflc controller.
Most versatile facts controller all encompassing capabilities of voltage regulation. A new algorithm for tcsc based controller design by using. During a steady state, the tcsc can be considered as a reactance jx tcsc. Scribd is the worlds largest social reading and publishing site. Compensator tcsc for power flow studies has been represented and discussed in details. Implementation of thyristor controlled series capacitor tcsc in. Tcsc damping controller design based on selflearning. Tcsc, the first generation of facts, can control the line impedance through the introduction of a thyristor controlled capacitor in series with the transmission line. Hope it will be useful for all the facts based enthusiasts. Facts controllers in power transmission and distribution 3. In the next step, a controller is employed along with the tcsc.
Pdf study of thyristor controlled series capacitor tcsc as a. Automatic control of thyristor controlled series capacitor tcsc. The following matlab project contains the source code and matlab examples used for tcsc based controller design. Tcsc design is based on the classical loopshaping, where loopshape refers to the magnitude of the loop transfer function l gk as a function of frequency. The dynamic performances of both the ll and pid structured tcsc controller are analyzed and compared under various disturbance conditions. Such specialized equipment is also tcsc from group of facts devices. Tcsc thyristor controlled series compensation keeping.
When tcsc operates in the constant impedance mode it uses voltage and current feedback for calculating the tcsc impedance. Upfc with series and shunt facts controllers for the economic. The advantages of converterbased facts controllers are continuous and precise power control, cost reduction of the associated relative components and a. Tcsc based controller design in matlab download free. Please contact if any other information is required. Generally, the damping control of a tcsc or any other facts controller should generally do the following. Study of thyristor controlled series capacitor tcsc as a useful facts device. Ee6004 flexible ac transmission systems facts syllabus unit i introduction reactive power control in electrical power transmission lines uncompensated transmission line series compensation basic concepts of static var compensator svc thyristor controlled series capacitor tcsc unified power flow controller upfc.
Series controllers consist of capacitors or reactors which introduce voltage in series with the line. The output signal of the tcsc based controller is the reactance offered by the tcsc, x tcsc d. Facts controller helps in raising dynamic stability limit, provide better power flow control also provides improvement in asset utilization, system flexibility and system performance. The facts technology is a collection of controllers, which can be applied individually or in coordination with others to control one or more of the interrelated system parameters, such as series impedance, shunt impedance, current, voltage, and damping of oscillations. Investigation of tcsc and sssc controller effects on the. Use of thyristor controlled series capacitor tcsc as flexible ac transmission system facts device brings a number of benefits for the user of the grid. Examples of series controllers are sssc, tcsc, tssc, etc. Download pdf download citation view references email request permissions. It has been in use for many years to increase line power transfer as well as to enhance system stability. In this paper we investigate the effects of the series facts devises i. The benefits of tcsc are seen in its ability to control the amount of compensation of a transmission line, and in its ability to operate in different modes. This book presents a comprehensive treatment of the subject by. Facts controllers are now considered a proven and mature technology.
This is based on modern high power electronic systems that provide fast controllability to ensure flexible operation under changing system conditions. A study of tcsc controller design for power system. It consists of a gain, a washout, and a two stage phase compensation block as shown in fig. Design and analysis of control circuit for tcsc facts. Tcsc controller design and protection logic under large disturbances. A tcsc is a series fact controller which provides series compensation in the transmission line in which it is installed by modifying the value of line reactance, the advantage of using tcsc is. This article employs the newton based opf tcsc solver of matlab simulator, thus it is essential to understand the development of opf and the suitability of newtonbased algorithms for solving. Pss design in which in study of dynamics power system, common designs for pss are leadlag compensation and pi 9. Transient stability improvement of multimachine power. Transmission line active power has been proposed as an effective input signal in, for series facts devices damping controller design.
Power flow control in power system using fact device. Power system stability improvement using facts devices. Thus the tcsc can be utilized as active power controller which enhances the system power to meet the consumers demand. Pss and tcsc damping controller coordinated design using. Facts devices can be utilized to control power flow and enhance system stability. Facts controllers facts controllers are the power electronics based circuits or devices which are used to control the power flow of flexible ac transmission systems. The output signal of the pss is the signal v s which is used as an additional input to the excitation system block.
In the presence of series compensators the system facts devices i. Parameters that belong to the system and to facts controllers exist in the psat program. The reference impedance indirectly determines the power level, although an automatic power control mode could also be introduced. This combination allows smooth control of the fundamental frequency capacitive reactance over a wide. Specific facts controllers including svc, statcom, tcsc, sssc, upfc, ipfc plus voltage regulators, phase shifters, and special controllers with a detailed comparison of their performance attributes major facts applications used in the united states. A separate pi controller is used in each operating mode. It is observed that leadlag structured tcsc controller where the controller parameters are optimized using itae as. Facts controller and also in minimizing the overall system cost, which comprises of generation cost and. Modelling, simulation and optimal tuning of tcsc controller 2.
Particularly with the deregulation of the electricity market, there is an increasing. Tcsc upgrading of series capacitor into tcsc typical values. In open loop, the tcsc acts as a fixed capacitor throughout the. Gto controlled series capacitor gcsc, thyristor controlled series capacitor tcsc and thyristor controlled series reactor tcsr connected in high voltage hv transmission line protected by distance relay, the total impedance and the measured impedance at the relaying point depend on the injected. For this reason, here, the active power of the transmission line is selected as the input signal. The facts controller is defined as a power electronic based system and other static equipment that provide control of one or more ac transmission system parameters. Tcsc power oscillation damping and pss design using. Thyristor controlled series compensator tcsc tcsc is one of the most important and best known series facts controllers. Tcsc 1006 guide to the securingretention of radioactive material payloads and packages during transport update 2018.
In same manner firing angle model for tcsc is used to control active power flow of the line to which tcsc is installed. The parameter values of tcsc controller added to the system were selected as shown in table 3. This article is very much useful for researchers for further research work carryout in regarding with the application of facts controllers in power system. Firing angle model for svc was proposed to control the voltage at which it is connected. Impact of series facts devices gcsc, tcsc and tcsr on. Their major task is to reduce the inductivity of the transmission line. The tcsc controller 279 the controllableinductance mode, thereby restricting the shortcircuit cur rents. Coordinated design of pss and tcsc damping controllers in. Hingorani, flexibile ac transmission systems, ieee press, new york. Thyristor controlled series capacitors tcsc, in particular. Abstract the primary goals of employing series flexible ac transmission system facts in auto matic generation control agc studies of. The control parameter for both pss and pod are calculated using ga. The mathematical models for tcsc have been established, and the optimal power flow opf problem with these facts devices is solved by newtons method. Tcsc is a series connected devices used in power systems to control the reactance of a.
Thus no interfacing equipment like high voltage transformer is required. The use of these controllers give grid planners and operators a greater flexibility regarding the type of control actions that can be taken at any given time. Thyristorcontrolled series compensation tcsc is used in power systems to dynamically control the reactance of a transmission line in order to provide sufficient load compensation. Introduction the tcsc concept is that capacitor is inserted directly in series with the transmission line and the thyristor controlled inductor is mounted directly in parallel with the capacitor. The recent introduction of tcsc has further widened the scope and added. Pdf for transmission of large amounts of electric power, ac in the overwhelming majority of cases is the. By changing the firing angle of this back to back thyristor it is possible to vary the reactance of the tcsc as per tcsc characteristics. This paper proposed the control scheme of tcsc for power flow control, benefits of facts controller, var compensation and tcsc module. Optimal placement of facts devices in the heavily loaded power system reduces. Among the facts devices, the tcsc controller has tremendous capability of giving the best results in terms of performance. The block diagram of the control scheme used is shown in fig. Analysis of the simulated tcsc shows similar functions as a physical.
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