4 results about "Power factor control" patented technology

The application provides a distributed power balancing and voltage regulating method for a current control type converter cluster. The method belongs to the field of micro-grid control, and is based on reactive voltage droop and voltage amplitude control to generate a reference current amplitude of the parallel converter, so that each parallel converter outputs the same current amplitude; meanwhile, the phase of the current vector is determined by four-quadrant power factor control, so as to ensure that the output currents among the parallel converters are in the same phase state, and the load side currents are effectively superimposed and the maximum load current is obtained. In view of the harmonic problem caused by the access of a nonlinear load, the application further adopts harmonic virtual impedance control at a fundamental frequency and selected harmonic frequencies, and combines with the multi-resonance controller adjustment of the current loop to effectively reduce the amplitude of the equivalent harmonic impedance of the DG unit, so that the harmonic circulating current among the DGs is minimized, and the power quality at the point of common coupling (PCC) is improved.

The present disclosure provides an air conditioner for improving a power factor. The air conditioner comprises: an inverter used to drive a motor; a load including the inverter; a power conversion circuit including a rectifying circuit, which rectifies an input alternating current voltage so as to generate a direct current voltage, and a power factor correction circuit, which supplies an output direct current voltage to the load on the basis of the direct current voltage; and a processor for power factor control of the power conversion circuit. The air conditioner may comprise: a phase estimator for acquiring phase information of the input alternating current voltage; a voltage controller that generates, on the basis of the output direct current voltage and a reference voltage, a first control signal for controlling the magnitude of the output direct current voltage; a partial switching controller that generates setting information for setting a switching period of a switch included in the power factor correction circuit; and a current controller that generates, on the basis of an input current of the power factor correction circuit and a reference current, a second control signal for controlling the switch in the switching period. The reference current can be generated on the basis of the phase information, the first control signal and the setting information.

A power factor control apparatus includes: a phase detection unit configured to detect the phase of an output signal outputted from an inverter, which was originally used to supply electric power to a first electric power supply target, to a second electric power supply target that is different from the first electric power supply target and connected with the inverter and an inverter control apparatus for controlling the inverter; a correction amount calculation unit configured to calculate a phase correction amount based on a power factor command value that is a power factor required by the second electric power supply target; and a correction processing unit configured to generate, based on the phase detected by the phase detection unit and the phase correction amount calculated by the correction amount calculation unit, a power factor control signal for controlling the power factor of electric power supplied to the second electric power supply target and output the generated power factor control signal to the inverter control apparatus.

This electronic device may comprise a display panel, and a power circuit for generating, from an alternating current signal, a power signal to be supplied to the display panel. The power circuit may comprise: a capacitor; a power factor conversion circuit connected to one end of the capacitor so as to control charging of the capacitor on the basis of the power factor of the alternating current signal; a direct current-direct current conversion circuit for generating the power signal on the basis of power charged in the capacitor; and a switching circuit for connecting one end of the capacitor to any one of a resistor or a ground node according to the voltage of the other end of the capacitor.