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The paper brief is one out of the first approaches in Turkey to popularize HVDC-light transmissions. It deals with: 1. Lab design and PSCAD modeling of a special bridge controlled AC - DC three load (star-delta) rectifier. It uses 9 group of valves (instead of 6 group valves of common bridge), three lines of former AC transmission, the earth and three DC loads between the lines and earth (or a star-delta...
In this paper an unsymmetrical operating dynamic interphase power flow controller (DIPFC) is described with a fundamental-component based model. The unsymmetrical control of this thyristor controlled FACTS device can be used to decouple the symmetrical components (positive-, negative- and zero-sequence component) of two connected arbitrary network notes. In an example network it is shown how the power...
This paper studies the use of voltage source converter (VSC) technology for the compensation of CERN's proton synchrotron (PS) particle accelerator. The PS accelerator load demands periodic, active and reactive power pulses of about 2s duration and an amplitude of up to 45 MW and 65 MVAr. The use of a conventional STATCOM is firstly investigated and the results show that very good reactive power compensation...
An efficient harmonic-oriented method based on parallel processing and the limit cycle method to compute the periodic, steady-state solution of large scale electric systems is presented in this paper. The time domain numeric solution is based on Newton methods and the Poincare map to accelerate the convergence to the limit cycle. Furthermore, the implementation of parallel processing using MPI programming...
This paper addresses the problem of closed-loop stability-enhancing control of shunt FACTS devices. As the feedback signals, rotor angles and speed deviations of the generators have been used as supplied by a wide-area phasor measurement system. Control laws have been derived for nonlinear multi-machine system model using direct Lyapunov method with the aim to enforce the fastest possible decay of...
A 200 MVA, 345 kV system control FACTS device, consisting of two 100 MVA converters, two 100 MVA high voltage series transformers inserted in 345 kV transmission lines and a 200 MVA shunt transformer, was tested and utilized on a 345 kV network. This device, namely convertible static compensator (CSC), has four basic configurations: static synchronous compensator (STATCOM), static synchronous series...
One of the ways of existed system interconnections usage effectiveness increasing and their static and dynamic stability providing is flexible system interconnections (FSI) usage. The flexible system interconnections alternative variants on phase inverter transformer (PhlT-TS) basis research is the matter of current. In this report one can find the results of PhlT-TS experimental sample studies in...
This paper presents a method to determine the performance of relieving congestions using a thyristor controlled series capacitor (TCSC) in a transmission network by comparing locational marginal prices (LMP). The method allows to study different parameter variations - e.g. varying demand or size of the TCSC. A full AC Optimal Power Flow including transmission limits is used to model the underlying...
As it is known the operation of two networks multiply interconnected may be affected by abnormal power flows in the weakest network, especially in conjunction with contingencies in the most powerful grid. The on-line control of the power flows through the interconnections, operated by Phase Shifter Transformers (PST)/Flexible AC Transmission Systems (FACTS), may avoid such inconveniences if proper...
This paper investigates several current control methods for load balancing and power factor correction based on distribution static compensator (STATCOM). Two different configurations are considered for STATCOM; a three leg inverter, and three single phase inverters. It is assumed that the STATCOM is associated with a load that is remote from the supply. After a brief introduction, control structure...
The analysis of the large power outages in 2003 indicate that innovate protection- and transmission functions are well suitable to significantly avoid or reduce such severe system disturbances. To do so, the aspects (i) safe transmission of information, (ii) decision support for network control, (iii) protection concepts, (iv) prevention of voltage collapse, (v) controlled homogeneous net load play...
The increases in power flows and environmental constraints are forcing electricity utilities to install new equipment to enhance network operation. Some application of flexible AC transmission system (FACTS) technologies to existing high-voltage power systems has proved the use of FACTS technology may be a cost-effective option for power delivery system enhancements. Amongst various power electronic...
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