This papaer will discuss the test results of a prototype compensator which compensates for the harmonics current and instantaneous reactive power in a power system. The compensator is composed of a PWM converter on which the instantaneous current control has been effected and SI (static induction) thyristors which a r e more excellent in switching characteristics than the gate turnoff thyristor have been applied t o as a power switching device. The use of SI thyristors allowed us to develop a practical compensator whose main circuit is more compact than before.The compensation algorithm of the equipment effects the instantaneous power control based upon the instantaneous spacial vector.This permits the hardware with the same configuration t o accomplish multiple compensating functions only by changing t h e software and also proves its excellence in the transient characteristics.
Voltage distortion of 6.6‐kV distribution systems has been increasing recently especially in commercial areas. Harmonic currents of certain orders are amplified and voltage distortions are generated by the resonance between system impedance and static capacitor under the leading power factor condition.
This paper describes the results of a test on suppression effects on model systems and an actual system. The effect of the use of an active power filter on the resonant harmonics of the system including capacitor was verified.
Abstmct -This paper presents a zero current switching based three-phase PWM inverter having small resonant circuits on the ac side, the resonant frequency of which is 60kHz. The zero current switching inverter can greatly reduce the switching losses and electromagnetic noises. In this paper, the principle of zero current switching operation, the design of the resonant circuits and the control sequence are described from a theoretical and practical point of view. Moreover, experimental results obtained from a zero current switching PWM inverter which is driving an induction motor of 2.2kW are shown to verify the practicability.
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