Abstract: A phase shifter circuit generates cycloconverter reference signals for independently and linearly controlling the real power and input power factor or real and reactive power in either polarity. Using the per phase line voltage as a reference phasor, its amplitude and phase are adjusted by a sine-cosine converter, analog multipliers and summing amplifiers. The phase shifter has an almost instantaneous response and can be controlled by polarity reversing dc control signals.

Abstract: In a system including an input cycloconverter which operates a high frequency resonant tank from a source of low frequency voltage supplied through a reactor, with or without an output cycloconverter, an input cycloconverter control circuit and method independently controls real and reactive power or real power and input power factor. The in-phase and quadrature components of input line current as well as the tank voltage are controlled, and for the main applications a simpler implementation has a limited range of phase angle settings close to 0.degree. and to .+-.90.degree.. The current control technique has the advantages of fast response and simplicity.

Abstract: In a system including an input cycloconverter which operates a high frequency resonant tank circuit from a source of low frequency voltage supplied through an input reactor, with or without an output cycloconverter, an input cycloconverter control method and circuit maintains the tank voltage within predetermined limits for both directions of power flow. An additional feature is that the input power factor is programmable. In the voltage control scheme the cycloconverter reference signals vary with the commanded real power and power factor and respectively control the quadrature and direct components of induced cycloconverter voltage.

Abstract: A polyphase cycloconverter operating in regenerative mode is connected between a voltage distribution system and a single phase high frequency resonant tank and controlled to produce essentially no real power flow to the resonant tank and a variable amount of leading (or lagging) reactive power. The static reactive power controller has fast response and can function as an electronically variable capacitor for power factor regulation, VAR control and adaptive filtering.