Multi-phase (employing phases more than three) power transmission systems have been investigated as a potential alternative to conventional three-phase systems for bulk power transmission at EHV and UHV levels in the past. The technology has been found to be effective to remove some of the limitations of threephase system arising out of the use of extremely high voltages to increase power capab...

Due to the fast increase in wind power production there is a need for detailed studies of integration problems. Integration problems arise from the characteristics of wind power and various technologies used in wind energy industry. In this paper, a case study of doubly fed induction generators connected with classical HVDC line commutated converter thyristor bridge is investigated. Operation s...

In this paper, a scheme based on generators and loads real and reactive power flow contribution factors has been presented for congestion management in pool based electricity markets. The system operator (SO) can identify the generators and loads based on these contribution factors for rescheduling their real and reactive power generation and loads to manage congestion. The real and reactive po...

Ultra high power, high voltage, power electronics is on the verge of a new era. Two new power semiconductor technologies, the high voltage IGBT and the GCT (Gate Commutated Thyristor) are improving the performance, simplifying the design and increasing the reliability of applications ranging from 100's of KVA to many MVA. This paper will discuss the characteristics and application consideration...

The paper reviews modeling of thyristor–controlled series capacitors (TCSC) which are highly nonlinear systems with continuous and discontinuous states, and proposes three nonlinear controllers for it: (1) An approximate feedback linearization control (FLC) (2) A sliding surface–like design (3) Control in transformed coordinates. Detailed (switched) time– domain simulations are used to verify t...

This paper describes a method to construct a linear model of a Thyristor-Controlled Series Capacitor (TCSC) by analyzing its time domain response when it is disturbed. All simulations are done in instantaneous value mode. With this technique, low-frequency dynamic behaviors of the TCSC are included in the linear model for both time domain simulations and linear analysis of the power system. How...

A robust damping control design methodology for a thyristor controlled phase angle regulator using global signals is proposed based on the simultaneous stabilisation approach. The numerical design algorithm determines the controller parameters in order to guarantee closed-loop poles in the left half plane with preferential treatment to those corresponding to the inter-area modes. Plant models u...

A design scheme of the intelligent SSB (Solid State Breaker) based on the IGCT (Integrated Gate Commutated Thyristor) is presented. The topology of switch module and the structure of the SSB are proposed. Firstly, to the IGCT’s over-voltage sensitivity problem, a new technique of reducing the over-voltage is introduced, which releases the elect romantics energy of faulty line by a capacitive cu...

TCSC (Thyristor-Controlled Series Compensator) has been used in modern power systems to increase power transfer and system stability. Besides, due to its controllable feature, TCSC has been used to work as a solution to sub-synchronous resonance (SSR) problems. However, it is not clear so far whether TCSC’s inherent characteristic can avoid SSR and its effectiveness for SSR damping. In this pap...

This paper presents a methodology to assess the voltage stability status combined with optimal power flow technique using an instantaneous two-bus equivalent model of power system incorporating static var compensator (SVC) and thyristor controlled series compensator (TCSC) controllers. There by, a generalized global voltage stability indicator being developed has been applied to a robust practi...