Use Of Static Var Compensator Research Articles

Transient Stability Impact of Short Circuit Fault System Based on SVC And PSS Applications

Researchers are currently focusing on two solutions, namely Static VAR compensator (SVC) and power system stabilizer (PSS), to address different power system stability issues in large area interconnected power grids. To enhance transient stability, researchers have suggested a combined approach involving SVC and PSS. In this method, SVC and PSS coordinate and cooperate with each other to provide better stability assurance. To verify the feasibility of this method, simulation experiments were conducted using MATLAB. Simulated the situation of single-phase ground fault, two-phase ground fault, and three-phase ground fault in the power system, and tested the effectiveness of SVC and PSS respectively. The simulation results show that the combined use of SVC and PSS can significantly improve the transient stability of power systems and effectively reduce the impact of faults on the system. In summary, the combined use of SVC and PSS can effectively solve various power system stability issues that may arise in large-scale interconnected power grids. By conducting simulation experiments in MATLAB, researchers have verified the feasibility of this method under different fault conditions, providing strong support for practical applications.

Analysis of the combined effects of SVC and SSSC controllers to improve power system stability

The primary challenge facing the electricity transmission system in the aftermath of the disruption is reestablishing stability. Through adjustment of the transmission parameters, the Flexible AC Transmission System (FACTS) devices have the potential to bring the system back into stable operation. It has been shown that using many FACTS devices together is more effective than using any one device alone. In this paper, the concept of coordination control between a Static Var Compensator (SVC) and a Static Synchronous Series Compensator (SSSC) is suggested in order to make the system more stable. The equivalent impedance of the line may be reduced by using the SSSC, which will also result in improved active power transfer capabilities for the line. A static var compensator, often known as an SVC, is used for shunt compensation in order to keep the bus voltage magnitude stable. When compared to the use of a single device, the use of SVC and SSSC coordinated control results in a much quicker arrival to the steady state response of the system. Both of these devices are controlled by using the same signal input tracking. It has also been seen that the system has resumed its previous synchronized state.

Dynamic hosting capacity of photovoltaic system analysis and enhancement using distributed SVC and STATCOM compensators: Case study of a university building

This paper presents a comprehensive approach for dynamically estimating the hosting capacity of photovoltaic (PV) systems. The proposed method takes into account time-dependent fluctuations of generation and load, as well as overvoltage constraints, in its mathematical model. A set of weekly measurements taken every minute from a low-voltage side of a university building in Morocco were analyzed to show load variations.The proposed approach is compared to a static method to demonstrate its effectiveness. The results show that the voltage increases after PV integration, but does not cause overvoltage, even in the worst-case scenario where generation exceeds load demand. To address voltage fluctuations, the use of Static VAr Compensators (SVC) and Static Synchronous Compensators (STATCOM) in distribution systems was compared. The simulation results indicated that STATCOM was more effective than SVC in mitigating voltage fluctuations, resulting in an improvement of the PV hosting capacity.

Improvement of the Voltage Profile and Loss Reduction in Distribution Network Using Moth Flame Algorithm: Wolaita Sodo, Ethiopia

Voltage stability and line losses are inevitable issues even in modern power systems. There are several techniques that emerged to solve problems in the power system to provide quality and uninterrupted supply to customers. The algorithms used in this paper to determine the appropriate location and size of the Static Var Compensator (SVC) in the Distribution Network (DN) are Moth Flame Optimization (MFO) and Particle Swarm Optimization (PSO). The objective function is defined to minimize voltage deviation and power loss. The burning problem of voltage stability improvement current scenario is because of a rise in electricity demands in all sectors. Paramount duties of power engineers are to keep the system stable and maintain voltage magnitude constant even during peak hours. The results were checked with the aid of MATLAB on Wolaita Sodo radial distribution of 34 bus data networks. The potential use of SVC is key to solve distribution system power quality issues and estimating the advantage of the installation. The results obtained from the test system were compared with PSO results. This comparison was done to know the computational time of proposed techniques. The performance of the MFA based SVC was superior in distribution system and highlighted the importance of device.

Optimal designing of static var compensator to improve voltage profile of power system using fuzzy logic control

The unbalanced and nonlinear characteristic of many loads connected to the power system can cause power quality problems, which in turn affects other consumers. Electric arc furnaces (EAF) are among the loads that cause major problems for system power quality. The use of static var compensator (SVC) is a way to reduce power quality problems caused by EAF. Since precise quantification of the SVC susceptance function can greatly influence the optimization of the reactive power, in this paper proposed using of a fuzzy logic controller to optimize the susceptance function to further improve the voltage profile and reduce SVC capacitance. The results from simulations show that the SVC based fuzzy method optimally determines the coefficient of the susceptance function. The results show that the proposed method with the proposed method has good performance in reduction of harmonic currents and improving the voltage profile of the system. So, the results clear that in case of EAF load, the SVC is capable of rapidly compensating its effect and improve the system power quality. By maintaining the bus voltage and eliminating voltage oscillations, the active power received is quickly stabilised and power oscillations are removed. Thus, power quality problems of EAF application is eliminated with application of optimized SVC based fuzzy method. In addition, the performance of the proposed method compared to mathematical methods in previous studies has been evaluated, which presents superiority of the proposed method in reducing voltage oscillations and reducing harmonic currents.

Analysis of Load Flow Method With Static Var Compensator (SVC) for Minimizing Transmission Losses in Power System : A Case Study of 500 KV Java-Bali Electrical Power System

<p class="Abstract">Demand for electricity is increasing rapidly, the consequence of this is a threat to the stability of the electrical system, one of which is the voltage stability. FACTS or Flexible Alternating Current Transmission System is electronic equipment that is able to regulate electric power transmission that can be used to overcome stability problems. This research will analyze the use of Static Var Compensator (SVC) as one of the equipment from FACTS to overcome the stability of the most critical buses by using the 500 kV Java-Bali electricity system using PSAT. Results from using the power flow method in the 500 kV Java-Bali case show that the total active power generation is 12.144 p.u. and the total reactive power generation is 5.268 p.u. This value is obtained from the total addition of active power generation and reactive power of all plants in the 500 kV Java-Bali system. While the total active power load is worth 12.058 p.u. and the total reactive power load is 4.65 p.u. This value is obtained from the total load on each bus plus the total losses incurred on the line.</p>

IMPACT OF STATIC VAR COMPENSATORS ON POWER SYSTEM: A CASE STUDY

With increase in load, any transmission, distribution and generating model suffers from disturbances. These disturbances effect the overall stability of the system. Criterias like voltage profile, power flows, losses tell us about the state of the system under study. Load flow analysis of the system under study is capable of providing the insight of the system. The Emergence of FACTS device is really a step forward for the flexible control or Power System Operations. FACTS is the name given to the application of the power electronics devices to control power flows and other quantities in the power system. But when it comes to implementation stage, optimizing the location becomes a great concern because of the high cost involved with FACTS devices especially converter like SVC, STATCOM etc. Static Var Compensator (SVC) is a power quality device, which employs power electronics to control the reactive power flow of the system where it is connected. It is able to provide fast-acting reactive power compensation on electrical systems. SVC is one of the methods and can be applied to obtain a system with least losses, increased power flow and healthy voltage profile. Number, location and size of SVC are the main concerns and they can be optimized to a great extent by Genetic Algorithm (GA) or any other method. Use of SVC in a system has shown considerable increase in voltage profile and power flows while decrease in losses.

Effect of Advanced Static VAR Compensator on Control of Power System Load Shedding

This paper investigates the effect of Static VAR Compensator (SVC) on power system load shedding. SVC is mainly used in power system stability improvement. This paper proposes a new use of SVC to reduce load shedding. An algorithm of Newton Raphson method (NR) to reduce the load shedding for installing SVC in the system is proposed in this paper. 5 bus test system example is used to demonstrate the effect on load shedding. The test results show that the effect of SVC is significant, in this Static VAR compensator (SVC) is incorporated in Newton Raphson method in which Power Flow Solution is a solution of the network under steady state conditions subjected to certain constraints under which the system operates. The power flow solution gives the nodal voltages and phase angles given a set of power injections at buses and specified voltages at a few, the model of SVC i.e. SVC Susceptance model is discussed. It is also shown that the power system losses are decreased after incorporating the SVC in this N-R method. The results are generated for 5-Bus system. By incorporating the SVC the amount of load shedding is reduced to get the voltages in their limits.

Advanced concepts of analysing static VAr compensators to damp inter‐area oscillation modes

AbstractThe analysis of low‐frequency inter‐area oscillations is of special concern in large weakly interconnected power systems. The ability of static VAr compensators (SVC) to contribute to damping depends strongly on the relative location of generation, load and the SVC. A comprehensive investigation of the use of static VAr compensators to aid damping of low‐frequency inter‐area oscillations in a real weakly interconnected large power system is presented. Based on modal analysis, efficient algorithms to compute voltage‐ and power‐oscillation flow for each mode of concern are developed. Controllability and observability measures are also used to assess the impact of dynamic voltage support on system damping as well as to identify optimal locations for SVC. The knowledge gained by these techniques allows to investigate the influence of existent SVC on overall system damping as well as to evaluate suitable alternatives to site new devices. Detailed time‐domain simulations are finally performed to check the validity of the knowledge gained and to assess the impact of dynamic voltage support on system transient behaviour.

Analytical investigation of the use of static VAR compensators to aid damping of inter-area oscillations

A comprehensive investigation of the use of Static VAR Compensators (SVCs) to aid damping of low-frequency inter-area oscillations in large interconnected power systems is presented. The study of inter-area oscillations and the design of controls is done using modal analysis of a linearized model of the power system. Based on this model an efficient algorithm to compute the power oscillation flow for each mode of concern is developed. This approach allows to identify the nature of oscillation patterns and provides important information needed in the application of SVCs. Controllability and observability measures are then used to assess the impact of dynamic voltage support on system damping as well as to identify optimal locations for SVCs. The influence of system structure and load effect on the SVC performance is discussed. Detailed time-domain analyses are finally performed to check the validity of the analysis and to assess the impact of dynamic voltage support on system transient behaviour.

A STATIC VAR COMPENSATOR CONTROL STRATEGY TO MAXIMIZE POWER SYSTEM DAMPING

A study of power system transient stability enhancement through effective use of static VAR compensator is presented. Optimal theoretical control strategy is derived from direct Lyapunov method for multi-machine system model as a control which forces the fastest dissipation of energy released in the system by a given fault. Strategy of this theoretical optimal control uses signal based on the state variables not available at the compensator bus. It is shown in the paper that optimal control signal can be replaced by the time derivative of locally measurable electric quantities. Dynamic properties of two such quantities are compared using eigenvalue analysis. On the basis of this study a current-orientated control strategy is proposed. Its validity and robustness is confirmed by simulation results for nonlinear multi-machine model.

Application of static VAr compensators for the dynamic performance of the Mead-Adelanto and Mead-Phoenix transmission projects

This paper presents the planning and pre-specification study analysis and results for the joint use of static VAr compensators (SVC), a form of flexible alternating current transmission system (FACTS) technology, for the Mead-Adelanto and Mead-Phoenix projects in the Southwestern USA. Because of insufficient system damping in the network, addition of these two transmission line projects must also be complemented by SVC. These devices increase the system stability limit so that the projects' planned transfer capabilities can be economically attained. These are the first transmission projects in the region where a very closely coordinated planning effort permits the joint use of SVC to provide mutual benefits to both projects. SVC dynamic performance enhancement studies, SVC control analysis, and studies related to the planning and specification requirements are among the topics addressed in the paper.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Simple robust adaptive control of static VAR compensator

AbstractA study of power system transient stability enhancement through effective use of static VAR compensator is presented. It is shown that optimal state‐variable control can be approximately realized as a simple closed‐loop control based on locally measurable electric quantities. In order to make this regulation more effective and insensitive to the changes of the network parameters and loading condition it is proposed to use simple adaptive control with dynamic gain tuned by additional control loops. Tests done for two‐machine and multi‐machine systems have confirmed the validity and robustness of the proposed control method.

Power system transient stability enhancement by optimal control of static VAR compensators

A study of power system transient stability enhancement through the effective use of static VAR compensators is presented. The optimal control strategy resulting from the direct Lyapunov method and Pontryagin's maximum principle requires a control signal based on the state variables not available at the compensator bus. It is proved that this optimal signal can be replaced by the time derivative of an electric quantity derived from local measurements. A control algorithm based on this quantity gives smooth and very effective regulation. Tests done for two-machine and multi-machine systems have confirmed the validity and robustness of the proposed control algorithm.

A co-ordinated compensation strategy involving synchronous generators and static VAR compensators in long distance AC transmission systems

Abstract The use of static VAR compensators (SVCs) in long distance AC transmission systems has been shown to be effective in damping voltage fluctuations and in enchancing both small disturbance and transient stability. To increase the capability of SVC employment, in this paper a new compensation strategy is developed, which co-ordinates the regulating action on SVCs with the control action on the excitation systems of the generating units located at the sending end of the transmission system. The resulting control scheme is of decentralized type and requires for each SVC and generating unit the feedback of local variables only. An example is presented to illustrate the validity and usefulness of the suggested approach.

The Interction of Torsional Reasonances with Network Resonances in Synchronous Generators

Subsynchronous torsional resonances have interacted with subsynchronous network resonances to cause shaft failures-in synchronous generators. But what of their interactions in the supersynchronous span of the frequency spectra? Are they safe? These questions have become relevant as more network resonances are being added to the power system through the increasing use of static VAR compensators and their smoothing filters. The paper offers a few answers to these questions using the phase modulation theory of the torsional interaction phenomenon.