Static controller for power factor correction and adaptive filtering
First Claim
1. A static reactive power controller comprisinga polyphase cycloconverter circuit connected in cascade with a high frequency resonant tank circuit effectively comprised by an inductor and capacitor in parallel, said cycloconverter circuit having in each phase an input filter including a series filter inductor connectable to a source of low frequency line voltage, andcontrol means for controlling said cycloconverter to produce real power flow to said resonant tank only approximately sufficient to supply the static controller losses while selectively producing a variable amount of leading and lagging reactive power as determined by the polarity and magnitude of a system control signal representative of a system quantity to be controlled.
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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.
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Citations
11 Claims
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1. A static reactive power controller comprising
a polyphase cycloconverter circuit connected in cascade with a high frequency resonant tank circuit effectively comprised by an inductor and capacitor in parallel, said cycloconverter circuit having in each phase an input filter including a series filter inductor connectable to a source of low frequency line voltage, and control means for controlling said cycloconverter to produce real power flow to said resonant tank only approximately sufficient to supply the static controller losses while selectively producing a variable amount of leading and lagging reactive power as determined by the polarity and magnitude of a system control signal representative of a system quantity to be controlled.
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4. A static reactive power controller comprising
a polyphase cycloconverter circuit connected in cascade with a single phase high frequency resonant tank circuit comprised by an inductor and a capacitor in parallel, said cycloconverter circuit having in each phase input filter means including a series filter inductor connectable to a source of low frequency distribution system voltage, and control means for controlling said cycloconverter to produce real power flow to said resonant tank only approximately sufficient to supply the static controller losses in dependence upon the magnitude and polarity of a real power control signal, said control means further controlling said cycloconverter to produce a variable amount of capacitive reactive power as determined by the magnitude of a system control signal representative of a distribution system quantity to be controlled.
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7. A static controller for power factor correction comprising
a polyphase cycloconverter circuit including a plurality of single phase-to-single phase cycloconverters each connected in cascade with a single phase high frequency resonant tank circuit comprised by an inductor and capacitor in parallel, said polyphase cycloconverter circuit having input filter means including in each phase a filter inductor in series with the respective single phase-to-single phase cycloconverter and connectable to a source of low frequency distribution system line voltage, and control means for controlling said cycloconverter to produce real power flow to said resonant tank only approximately sufficient to supply the static controller losses while selectively producing a variable amount of leading and lagging reactive power as determined by the polarity and magnitude of a distribution system power factor correction control signal.
Specification