The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Deregulation and privatization are posing new challenges to high voltage transmission and distributions systems. System components are loaded up to their thermal limits, and power trading with fast varying load patterns is leading to an increasing congestion. In addition to this, the dramatic global climate developments call for changes in the way electricity is supplied. Innovative solutions with...
STATCOM has been widely proposed for power quality and network stability improvement. It is easily connected in parallel to the electric network and has many advantages for electrical grids. It can improve network stability; power factor, power transfer rating and can avoid some disturbances such as sags and swells. Most of STATCOM controllers are based on voltage controllers that are based on balance...
Elmhurst Substation is located in Commonwealth Edison's (ComEd's) Northeast subzone. To support reliability in that area of the system when synchronous condensers that have been in operation in the region are retired, two identical 300 MVAr Static VAr Compensators (SVCs) will be installed at the Elmhurst Substation. Each SVC consists of three Thyristor Switched Capacitors (TSCs) rated at 75 MVAr (TSC1),...
As part of the Northwest Transmission Development projects, Alberta Electric System Operator (the AESO) and ATCO Electric Ltd (ATCO) identified the need to provide reactive power compensation to support area voltage and to provide voltage stability in Grand Prairie/Peace River area in the Province of Alberta. It was identified that a +/− 30 MVAr Static VAR Compensator (SVC) would be required to provide...
A control strategy using sliding mode variable structure control with an integral action is used for DSTATCOM. The steady-state error of compensation current control is effectively reduced, and the response speed is increased by the integral action. The control strategy has good robustness to parameter disturbance in both transient and steady states. The strategy uses sliding mode variable structure...
The change of active and reactive output of wind power station is quite random. If no appropriate reactive regulation is adopted, the voltage change of common connecting points will be frequently. After large-scale wind power station has been connected into the power grid, it will not only affect the power quality of the power grid but also endanger the safe and stable operation of the power grid...
Consistency and stability are crucial to reliable operation of cascade STATCOM. In this paper, fundamental frequency switching pulse cycle transposition methods are proposed to keep the voltage balance of DC capacitors, and analyzed combining with the 11-level cascade STATCOM. The simulation results show the feasibility and effectiveness of the proposed method.
This paper proposes a method of enhancing system stability with a distribution static compensator (DSTATCOM) in an autonomous microgrid with multiple distributed generators (DG). It is assumed that there are both inertial and non-inertial DGs connected to the microgrid. The inertial DG can be a synchronous machine of smaller rating while inertia less DGs (solar) are assumed as DC sources. The inertia...
In this paper a new scheme of unified power flow controller (UPFC) with matrix converter is proposed. The basic problems of the existing UPFC structure are discussed. The main aim of this paper is to present selected results of the analysis of the new UPFC based on matrix converter. Also the paper describes in detail the modulation algorithm used for the matrix converter and the closed loop control...
Reactive power compensation of a Static Synchronous Compensator (STATCOM) employing three-level inverter based on diode-clamped was realized using alternation working switch order based pulse width modulation (PWM). The design of alternation working switch order based PWM and its realization based on DSP was described. A scale model simulation of the proposed STATCOM was accomplished to study the...
Sliding mode controllers for power converters usually employ hysteresis comparators to directly generate the power semiconductors switching states. This paper presents a new sliding mode modulator based on the direct implementation of the sliding mode stability condition, which for multilevel power converters shows advantages, as branch equalized switching frequencies and less distortion on the ac...
The paper proposes novel FACTS based stabilization scheme for maximum energy utilization of a tidal energy system using particle swarm optimization PSO search technique. PSO is implemented in the control of a hybrid low cost dynamic filter/capacitor compensation DFC and static VAR compensator SVC (TCR+FC) scheme. The dynamic self regulating control method uses real time error to stabilize the tidal...
The paper proposes novel FACTS based stabilization scheme for maximum energy utilization of a tidal energy system using Particle Swarm Optimization PSO search technique. PSO is implemented in the control of a hybrid low cost dynamic filter/capacitor compensation DFC and Static VAR Compensator SVC (TCR+FC) scheme. The dynamic self regulating control method uses real time error to stabilize the Tidal...
This paper presents analysis of time-ratio-controlled autotransformer as a mitigating device for voltage sag disturbance. Control circuit based on load RMS and voltage sag sensing circuit based on peak detection are employed. Commonly dynamic voltage restorer and STATCOM are employed for mitigation of voltage sag. The proposed system has less number of switching devices in comparison to commonly used...
The phasor solution method is a new high-efficiency simulation method for power system analysis. In this paper, using this new solution method, a model of the static VAR compensators (SVC) on a power transmission system is built, the steady-state and dynamic performance of the SVC is simulated. The result shows that the phasor solution method can reduce simulation time greatly, and has good precision.
In this paper, a new dynamic voltage-var compensator is introduced, compared to the traditional SVC, the new voltage source of continuous two-way adjustable SVC has significant advantages. This paper has introduced the fundamental of the SVPWM; SVPWM control technology is an optimized PWM control technology, compared with the traditional PWM technology, SVPWM with a high utilizationrate, less harmonic...
Distributed static series compensators (DSSC) are used to modulate series impedance of critical transmission lines in order to improve voltage stability margin. Voltage margin sensitivity is derived with respect to the applied control using DSSC. An example where applying load shedding results in reduction in margin is presented. In this case a DSSC is able to increase the margin substantially.
Discrete-event systems (DESs) can be found as an essential integrated subsystems in electrical power systems. The supervisory control theory is a general theory for synthesis of controllers for DESs. Under-load tap-changing transformers (ULTC) which obviously have discrete-event behavior are widely used in transmission systems to take care of instantaneous variations in the load conditions in substations...
AC operated electronic equipment are vulnerable to momentary losses of AC voltage, which are known as voltage sags. Voltage sags are commonly caused by lightning, accidental short circuit, loose connection, starting of large motors (or air-conditioners) or abnormal use of the AC mains. In sensitive and critical applications, such as semiconductor material processing and medical operation, voltage...
In this paper, a novel design approach of the PI controller used for individual DC voltage balancing control of cascaded H-bridge converter-based STATic synchronous COMpensator (STATCOM) is presented. By means of phase shift sinusoidal pulse width modulation, using two control loops(DC voltage control loop and phase angle shift control loop) to ensure DC voltage balance, the proposed approach can...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.