Title :
A large-scale PWM solid-state synchronous condenser
Author :
Kojori, Hassan Ali ; Dewan, Shashi B. ; Lavers, J. Douglas
Author_Institution :
Dept. of Electr. Eng., Toronto Univ., Ont., Canada
Abstract :
The description, steady-state analysis, and control design of a microcontroller-based large-scale pulse-width modulated solid-state synchronous condenser (PWM-SSSC) for reactive power compensation is presented. The key feature of the proposed compensator is the low switching frequency of the PWM pattern, which allows the utilization of high-power GTO thyristors. The PWM-SSSC has the additional advantage that large passive magnetic components are substituted with silicon. Closed-loop operation of a high-power PWM-SSSC (having a poor inherent damping) with a PI controller is investigated. Cumbersome z-domain methods for pulse stability analysis are completely avoided by using direct s-domain computations. A systematic approach for tuning the controller parameters is introduced by extending the concept of absolute stability. Selected predicted results are experimentally verified on a scaled-down laboratory prototype
Keywords :
closed loop systems; compensation; control system analysis; control system synthesis; digital control; microcontrollers; power capacitors; power control; pulse width modulation; reactive power; stability; switching; thyristor applications; two-term control; GTO thyristors; PI controller; PWM solid-state synchronous condenser; closed loop systems; control design; direct s-domain computations; microcontrollers; power capacitors; pulse stability analysis; reactive power compensation; steady-state analysis; switching frequency; tuning; Control design; Large-scale systems; Pulse width modulation; Reactive power control; Silicon; Solid state circuits; Space vector pulse width modulation; Steady-state; Switching frequency; Thyristors;
Journal_Title :
Industry Applications, IEEE Transactions on
