Electricity: power supply or regulation systems – For reactive power control – Using impedance
Patent
1995-01-06
1996-07-02
Wong, Peter S.
Electricity: power supply or regulation systems
For reactive power control
Using impedance
363 40, 363 44, H02M 112
Patent
active
055325750
ABSTRACT:
A multilevel convertor having a set of series-connected capacitors and a set of associated series-connected switching elements employs a main control loop which controls some aspect of an AC system, e.g. busbar voltage, by controlling the switching times of the switching elements. The convertor also comprises one or more subsidiary control loops for establishing a desired relationship between mean DC voltage levels on the capacitors. The subsidiary control loops combine first signals proportional to DC voltage levels on the capacitors and second signals proportional to tap currents associated with the capacitor nodes to provide signals which modulate the timing of the switching of switching elements connected to those capacitors which are out of balance, while leaving alone the timing of the switching of switching elements associated with those capacitors which have the required voltage across them. The advantage of the invention is that it prevents the "run-away" of individual capacitor voltages to values grossly in error, the run-away being due either to spontaneous instability or to temporary disturbances.
REFERENCES:
patent: 5345375 (1994-09-01), Mohan
Ainsworth John D.
Trainer David R.
GEC Alsthom Limited
Krishnan Aditya
Wong Peter S.
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