Adaptive controller for STATCOM to enhance voltage stability

摘要

An adaptive controller for a static compensator (STATCOM) to enhance voltage stability comprises an outer voltage regulator loop and an inner current regulator loop. Each of the outer loop and the inner loop comprises a proportional integral controller. The outer loop adjusts proportional and integral control gains of voltage regulator. The inner loop adjusts proportional arid integral parts of current regulator gains. The automatic adjustment of these regulator gains is adaptively determined such that the voltage at the controlled bus follows a desired voltage, reference curve over time returning to a desired steady-state condition under various disturbances such as changes in load and/or transmission network. Thus, the adaptive controller can achieve a plug-and-play feature for a STATCOM without human intervention.

主权项

1. Apparatus for adaptive control for use with a static compensator (STATCOM) for a power system, the adaptive control apparatus comprising:
a voltage regulator outer loop and a current regulator inner loop; the voltage regulator outer loop comprising a comparator configured to compare a desired reference voltage value to a measured voltage value at a point of interest for voltage control, a proportional integral controller in the voltage regulator loop outputting a q-axis current, a minimum-maximum current limiter whose input is the q-axis current output from the proportional integral controller, and an adjustment circuit for adjusting the proportional and integral gains of the voltage regulator loop according to the comparison; and the current regulator inner loop comprising an inner loop comparator configured to compare the q-axis reference current value which is the output of the minimum-maximum current limiter circuit in the voltage regulator outer loop with the q-axis current to adjust phase angle, a proportional integral controller, a minimum-maximum phase angle limiter, and an adjustment circuit for adjusting the proportional and integral gains of the proportional controller of current regulator loop according to the comparison.