METHOD FOR CONTROLLING OPERATION OF M-PHASE AC-TO-AC REGULATING CONVERTER

FIELD: converter engineering; power supply converters for various electrical installations. ^ SUBSTANCE: proposed m-phase AC-to-AC regulating converter has m single-phase circuits interconnected in m-phase circuit, for instance in star, and connected to m-phase low-frequency AC supply mains; each single-phase circuit has one two-way conductivity arm of two controlled switches connected in parallel opposition and single-phase resistive-inductive load in the form of parallel resistive high-frequency oscillatory LC circuit; two-way conductivity arm of controlled switches and resistive-inductive load in each single-phase circuit are connected in series. Low- and high-frequency currents are generated in resistive-inductive load of AC-to-AC regulating converter at a time for which purpose rating of high-frequency compensating capacitor is chosen so that resonant frequency of LC oscillatory circuit is higher than frequency of m-phase low-frequency AC circuit by 5 times; control pulses for switches are generated in the form of high-frequency pulse bursts whose repetition rate equals frequency of m-phase AC supply mains; repetition rate of high-frequency control pulses in pulse burst equals resonant frequency of resonance-tuned parallel high-frequency LC circuit and relative duration of high-frequency control pulses in burst is given for condition of maximal active power in resistive-inductive load due to high-frequency current. ^ EFFECT: ability of shaping signal in resistive-inductive load of regulating converter incorporating high- and low-frequency currents at a time. ^ 1 cl, 5 dwg