STATCOM Device Research Articles

Optimal Location and Parameter Setting of STATCOM Device Based PSO for Iraqi Grid Voltage Profile Enhancement and Power Losses Minimizing

The main goal of this work is to enhance the Voltage stability by using optimum location and parameters setting of STATCOM device. The parameters are the magnitude of the output voltage 𝑉𝑉𝑅 and the angle 𝛿𝑉𝑅, these parameters are taken to control the device performance. The simulation results have been done by using power flow program solution by Newton-Raphson method (Matlab program / M-file) with Particle Swarm Optimization (PSO) technique, for power losses minimizing and improving voltage profile. Two systems have been implemented:- IEEE 5-bus test system and Iraqi (400 kV) National super Grid System 27-bus. The MATLAB programs are Applied in the first step on IEEE 5- bus test system to examine the performance of the programs by comparing the results with other references, then it is implemented on Iraqi (400 kV) National super Grid System to find optimum location and parameter setting of STATCOM device. The results show that, the STATCOM has significant effect on improving the voltage profile and reducing apparent power losses, The STATCOM device performance depends on its location and parameter settings, and The PSO algorithm can easily find out the optimal location and parameters setting of the STATCOM for which the voltage deviation are minimum

Design of Improving Bus Short Circuit Residual Voltage Based on Reactive Power Regulation of Synchronous Motor

When a short circuit fault occurs in a power system, the short circuit current value in the short circuit increases greatly, and at the same time, it will reduce the voltage in the power network, even 60 percent to 70 percent of the original voltage, then the power of some users was destroyed. In order to make the system work properly, it is important to analyse the cause of bus voltage drop. The traditional solution is to increase reactive power by using external equipment, such as static capacitor or STATCOM device, but the cost of the above two devices is too high. And each bus bar lower end of the load is connected with synchronous motor in Xindu Chemical 110kv Substation. When a short circuit fault occurs in the system, the synchronous motor can be excited in a short time to reduce the voltage drop, which is economical and fast. In this paper, four excitation modes of synchronous machine are analysed in detail, including constant excitation current, constant reactive power excitation, constant power factor excitation and constant active power excitation. Finally, the constant active power excitation model is chosen to solve the problems encountered. Finally, the short circuit current is judged quickly, so that the short-circuit fault can be judged quickly according to the change rate of the current in the system.

Impact of PSS and STATCOM Devices to the Dynamic Performance of a Multi-Machine Power System

Impact of PSS and STATCOM Devices to the Dynamic Performance of a Multi-Machine Power System

STATCOM Impact on Distance Relay Performance

Flexible AC Transmission System devices provide for better utilization of already existing transmission systems as well as newly installed and upgraded systems. The use of such devices in the power transmission systems introduce new situations and variable operating conditions that need to be addressed in the fields of power system protection, system stability etc. In this work, the effect of introducing a STATCOM device in the send-end and mid-point of a moderately long transmission line is analyzed.   The analysis concerns the effect of such device on the performance of the power line distance protection. Extensive series of various fault studies were conducted using MATLAB/SIMULINK models of a distance relay, STATCOM device, and the power transmission system under study. Obtained results confirmed the idea of varied apparent impedance seen by the distance relay. In conclusion a distance relay may not operate dependably in presence of STATCOM device without prior actions considered in the relay setting stages. &nbsp

Using STATCOM with Energy Storage to Enhance the Stability of AC-DC Hybrid System

UHVDC has been rapidly developed for its large conveying capacity, small net loss and easy power control, which can solve the problem of the uneven distribution of load and energy with great economy. However, with DC transmission access, the power system must have a strong ability of reactive power support to cope with the possibility of transient voltage problem. At the same time, regional power oscillation issue also can’t be ignored. Considering that the STATCOM device, as a type of parallel FACTS, can only provide dynamic reactive power to support the system voltage and cannot undertake active regulation and control to damp system power oscillation problem, STATCOM with energy storage is presented in this paper to solve both problem of transient voltage and power oscillation in AC-DC hybrid system. In view of the central China province power grid planning, possible serious faults of the system were analyzed. The simulation results show that STATCOM with energy storage cannot only effectively support the system transient voltage and promote voltage of dc inverter station to avoid DC block caused by commutation failure, but also can significantly enhance the system damping and restrain regional power oscillation in case of system failure.

Analysis of STATCOM, SVC and UPFC FACTS Devices for Transient Stability Improvement in Power System

Analysis of STATCOM, SVC and UPFC FACTS Devices for Transient Stability Improvement in Power System

Application of PI and Super Twisting Drivers to Voltage Regulation of Wind farm via StatCom

In this paper, the steady-state and dynamic behavior of a wind farm with reactive power compensation using a StatCom devices is analyzed. An algorithm and a method for calculating the steady-state of the wind farm with SCIG and the random wind speed is proposed. A StatCom is used to minimize the effects of the wind speed variation. Two controllers are analyzed in the StatCom; one PI lineal type and the other is a non-lineal robust type known as Super-Twisting, to regulate the voltage magnitude in the connection node.

Grey Wolf Optimization for Multi Input Multi Output System

Grey wolf optimizer (GWO) is a new technique, which can be applied successfully for solving optimized problems. The GWO indeed simulates the leadership hierarchy and hunting mechanism of grey wolves. There are four types of grey wolves which are alpha, beta, delta and omega. Those four types can be used for simulating the leadership hierarchy. In order to complete the process of GWO a three main steps of hunting, searching for prey, encircling prey and attacking prey are implemented. This work describes a novel meta-heuristic based on grey wolf optimization for optimum allocation of STATCOM devices on power system grid to minimized load buses voltage deviations and system power losses. Bus voltages have been solved by controlling the reactive power of shunt compensator. The Contingency management problem (such as system over-loading and a single line outages) by optimum installation of STATCOM devices, has been presented. Simulations are performed on IEEE 30-bus power system indicate that the proposed approach is a powerful search and optimization technique that may yield better solutions to engineering problems than those obtained using traditional algorithms.

Fault Ride Through in Grid-connected WECS Using FACTS

This paper discusses the effectiveness of installing two types of FACTS devices, namely STATCOM and DVR to enhance the fault ride through (FRT) capability of a doubly fed induction generator (DFIG) applied in wind energy conversion systems (WECS). The response of the DFIG to a 3-phase ground fault is investigated with each of these devices. Comparing the stator and rotor voltages, stator and rotor currents, active and reactive power, of the two investigated systems is presented. PI controllers are employed to allow the rotor speed to follow the turbine speed and to adjust the applied rotor voltage magnitude and phase angle according to the wind turbine speed for maximum power tracking. This is achieved by controlling the two PWM converters connected between the rotor circuit and the electrical grid. Results showed a better FRT when using the STATCOM device with the DFIG.

Research on the Multilevel STATCOM based on the H-bridge Cascaded

This paper mainly studies the main circuit topology, the working principle, modulation technique and control strategy of the STATCOM based on H-bridge. The STATCOM direct power control algorithm based on the virtual flux is used to control the AC side reactive power compensation, and in accordance with the principle of conservation of power, the DC side voltage imbalance factors are analyzed, and a distributed DC voltage control algorithm is also introduced. The DC side control algorithm is divided into upper and lower control parts, of which the upper control section is aimed at the average of DC side capacitor voltage of the sub-module unit for the STATCOM device, the lower control part is mainly for each sub-module DC side capacitor voltage. Finally, the control strategy is verified in a three level chain STATCOM system with VME control box as its core controller, and the experimental results show that the algorithm is feasible.

Novel Selection Approach of STATCOM Device Tailored and Optimized Engineering Configuration to Implement in Between Qatar and Bahrain

This paper presents a nontraditional control and operation of a STATCOM connecting the Qatar and Bahrain in the Gulf Cooperative Council Interconnection. The proposed work will demonstrate precisely STATCOM control parameters, improving the STATCOM performance at different transmission contingencies. The integrity of the proposed control system topology is evaluated through set of time based simulations by using Matlab. Based on simulation results which clearly show an increase of the loadability, reduction of the losses and enhancement of the sustainability of the GCC Interconnection can be achieved.

Improving Nonlinear Coordinated Control of Non-ideal STATCOM and Excitation of Salient-pole Generator

The complexity of controlling is analyzed when the phase difference of voltage and current at the access point of STATCOM is in arbitrary angle β which is not in the ideal state of 90° for the coordinated control of detailed model of the salient -pole generators and STATCOM that is one of the core devices of the FACTS. The characteristics of single machine infinite-bus system including STATCOM are analyzed by establishing the nonlinear system model with algebraic constraint equations of one salient-pole generator and STATCOM and the detail control method of the excitation and STATCOM devices is designed by adopting geometric feedback linearization theory combined with classical linear quadratic optimal control. The method of design in this study expands the applied range of geometric linearization theory used in differential-algebraic systems and makes the coordinated control of excitation and STATCOM more feasible for practical engineering applications, which makes up for the insignificancy of the coordinated control research of salient-pole generator excitation and STATCOM.

Active Reactive Power Flow Control Using Static Synchronous Series Compensator (SSSC)

In present scenario, the performance of power systems decreases with the size, the loading and the complexity of the system networks. This is related to problems with power oscillations, large power flow and voltage instability with inadequate control, so the power flow control plays a major role in power systems. In this paper SSSC series FACTS device are regulates system voltage by absorbing or generating reactive power and the control of active, reactive power flow and voltage well as damping power system oscillations in long transmission line. In this paper results of SSSC series FACT device compared with the STATCOM shunt FACT device and Simulation studies were carried out in the MATLAB simulation environment to observe the compensation achieved by the SSSC device. The system parameters such as voltage, current, active power and reactive power transmissions are observed when the SSSC, STATCOM device is connected to the power system. For the simulation purpose, the model of two-area four-machine 11-bus system with SSSC and STATCOM device is developed in MATLAB/SIMULINK using Simpower System (SPS) blockset.

Damping of Power System Oscillations by Using Coordinated Control of PSS and STATCOM Devices

Damping of Power System Oscillations by Using Coordinated Control of PSS and STATCOM Devices

STATCOM Control Reconfiguration Technique for Steady State and Dynamic Performance Optimization during Network Fault Conditions

The introduction of flexible AC transmission/distribution system (FACTS) in a power system is to improve the stability, reduce the losses, and also improve the loadability of the network system. Herein, the proposed work is a non-traditional optimization technique which has been adopted to optimize the various process control parameters that contribute notably to control STATCOM device operations in a power system network during any undesired condition. The simulation was performed by taking into consideration STATCOM process control parameters; hereby the controller was also configured in strategic ways to optimize the control model under both steady state and dynamic performances. The optimization process results have clearly indicated that the introduction of STATCOM device in the right location of the system increases the loadability and sustainability of the power system through optimization process. The new control can thus be effectively used for this type of optimization process.