GAIN COMPENSATION FOR POWER FACTOR IN LINE CURRENT REGULATING SYSTEMS INVOLVING REACTIVE POWER

摘要

11 HV 04261ABSTRACT OF THE DISCLOSUREIn an alternating current electric power system ofthe type subject to rapid load voltage regulation as a resultof variations in reactive load current, reactive load currentcompensation is provided by fixed capacitors and inductors inparallel with the load, the inductors being in series withstatic switches which are phase controlled to continuouslymaintain the net reactive compensating current substantiallyequal and opposite to the reactive component of load current.Compensation control determines firing time of the staticswitches in accordance with the magnitude of reactive loadcurrent. Regulating means additionally controls firing timeto maintain line current and line to neutral voltage at a sel-ected line location substantially in phase coincidence. Theregulating means is provided with means for enhancing the stab-ility of the system under no load or light load conditions.In a preferred embodiment, regulation stability is enhancedthrough the application of a small real or, in phase currentsignal whenever the real or in phase component of actual linecurrent at the selected line location is less than a predeterminedlevel which is desirable for stable regulation of the powersystem.