Advanced Series Compensator Research Articles

Steady-State Modeling of an Advanced Series Compensator for Power Flow Analysis of Electric Networks in Phase Coordinates

This paper reports on advanced series compensator (ASC) models suitable for large-scale power flow studies. The ASC models are developed in phase coordinates and incorporated into an existing polyphase Newton-Rapshon power flow algorithm. The ASC state variables are combined with the nodal voltage magnitudes and angles of the network in a single frame of reference for highly robust and unified iterative solutions. Analysis of the ASC performance is carried out in both balanced and unbalanced power network operating conditions. The electrical interaction between the ASC phases is considered in order to define a feasible active power control region. Test results are presented to show the prowess of the ASC models.

Steady-state modeling of an advanced series compensator for power flow analysis of electric networks in phase co-ordinates

Steady-state modeling of an advanced series compensator for power flow analysis of electric networks in phase co-ordinates

VSI‐based series compensation scheme for transmission lines

AbstractThis paper addresses the loadability of long transmission lines. An advanced series compensation scheme is presented consisting of a series‐connected voltage‐sourced inverter and fixed series‐capacitors. This scheme provides substantial increase of the line loadability beyond that achievable with fixed capacitive compensation alone. In addition, it provides smooth power‐flow control. Results from simulation studies demonstrate its effectiveness in improving the loadability of long transmission lines and providing damping of interarea oscillations.

97/02859 Comparative assessment of the effect of dynamic load models on voltage stability

This paper characterizes the operation of a thyristor controlled reactor (TCR) which consists of an inductance and a bi-directional thyristor switch connected in parallel. Firing angle control of the thyristor switches regulates the time for which the inductance is included in the circuit. This controls the average value of the inductance. The continuously regulated inductance can be used for line flow regulation and short circuit current reduction. It can also be used for series compensation when the TCR is connected in series with a fixed capacitor and when the combination is inserted in series with transmission lines. This paper analysis the operation of the TCR using equations and EMTP simulations.The analysis shows that a series compensator using TCR regulates the level of compensation from inductive to capacitive and the system response is faster than the recently commercialized ‘Advanced Series Compensation’ (ASC) scheme. Also, the problems of resonance and harmonic instability associated with the ASC are eliminated. The TCR can control short circuit current within half cycle.

97/02868 Focus on motors and drives

This paper characterizes the operation of a thyristor controlled reactor (TCR) which consists of an inductance and a bi-directional thyristor switch connected in parallel. Firing angle control of the thyristor switches regulates the time for which the inductance is included in the circuit. This controls the average value of the inductance. The continuously regulated inductance can be used for line flow regulation and short circuit current reduction. It can also be used for series compensation when the TCR is connected in series with a fixed capacitor and when the combination is inserted in series with transmission lines. This paper analysis the operation of the TCR using equations and EMTP simulations.The analysis shows that a series compensator using TCR regulates the level of compensation from inductive to capacitive and the system response is faster than the recently commercialized ‘Advanced Series Compensation’ (ASC) scheme. Also, the problems of resonance and harmonic instability associated with the ASC are eliminated. The TCR can control short circuit current within half cycle.

Characterization of a thyristor controlled reactor

This paper characterizes the operation of a thyristor controlled reactor (TCR) which consists of an inductance and a bi-directional thyristor switch connected in parallel. Firing angle control of the thyristor switches regulates the time for which the inductance is included in the circuit. This controls the average value of the inductance. The continuously regulated inductance can be used for line flow regulation and short circuit current reduction. It can also be used for series compensation when the TCR is connected in series with a fixed capacitor and when the combination is inserted in series with transmission lines. This paper analysis the operation of the TCR using equations and EMTP simulations. The analysis shows that a series compensator using TCR regulates the level of compensation from inductive to capacitive and the system response is faster than the recently commercialized ‘Advanced Series Compensation’ (ASC) scheme. Also, the problems of resonance and harmonic instability associated with the ASC are eliminated. The TCR can control short circuit current within half cycle.

A stability model for the advanced series compensator (ASC)

This paper develops an accurate and general stability model for the ASC (thyristor controlled reactor). The model is valid for both the capacitive and inductive regions of the ASC operation. It is accurate in that the instantaneous voltage and current waveforms and also the fundamental component of the capacitor voltage (needed for stability) are determined every half-cycle by solving the differential equations of the ASC circuit. The model is capable of incorporating any control algorithms. The validity of the model is demonstrated by comparing the model with the Electromagnetic Transient Program (EMTP) digital simulations using step time of 10 /spl mu/s.

Advanced series compensation for transmission systems using a switched capacitor module

A design strategy is presented for a switched capacitor module for use in series-compensation schemes. The module offers improvements over existing schemes by utilizing thyristor-switched capacitors to allow fast, reliable and flexible series compensation. It is shown that offset voltages due to reinsertion can be eliminated in several ways, and proper damping prevents thyristor damage. The minimum energy rating required for the metal oxide varistor (MOV) is specified based on the switching capabilities of the thyristor pair.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>