Disclosed is a control device controlling an operation of an active filter which is connected in parallel with a load at an installation point (P) with respect to an AC power source and which supplies a compensation current (Ic) to the installation point (P) so as to compensate for a harmonic component of a load current (Io) flowing through the load. The control device includes: a dq converter converting the load current (Io) into a component of a d-axis current and a component of a q-axis current; a high-pass filter extracting a harmonic component from at least the component of the q-axis current output from the dq converter; a multiplier outputting a result obtained by multiplying a component of a d-axis current output from the high-pass filter by a compensation rate (Kd) as a current command value (id*); and a multiplier outputting a result obtained by multiplying the component of the q-axis current output from the dq converter or a component of a q-axis current output from the high-pass filter by a compensation rate (Kq) as a current command value (iq*). The compensation rate (Kq) of the q-axis current in the multipliers is adjustable.

Disclosed is a control device controlling an operation of an active filter which is connected in parallel with a load at an installation point (P) with respect to an AC power source and which supplies a compensation current (Ic) to the installation point (P) so as to compensate for a harmonic component of a load current (Io) flowing through the load. The control device includes: a dq converter converting the load current (Io) into a component of a d-axis current and a component of a q-axis current; a high-pass filter extracting a harmonic component from at least the component of the q-axis current output from the dq converter; a multiplier outputting a result obtained by multiplying a component of a d-axis current output from the high-pass filter by a compensation rate (Kd) as a current command value (id*); and a multiplier outputting a result obtained by multiplying the component of the q-axis current output from the dq converter or a component of a q-axis current output from the high-pass filter by a compensation rate (Kq) as a current command value (iq*). The compensation rate (Kq) of the q-axis current in the multipliers is adjustable.

A power converter device includes: a rectifier configured to convert AC power into DC power based on a PWM control signal; a voltage detecting unit configured to detect a voltage of a smoothing capacitor that is connected on a DC side of the rectifier; a capacitance estimating unit configured to estimate capacitance of the smoothing capacitor; a voltage control unit configured to calculate a voltage loop gain from the estimated capacitance and generate a control voltage from the voltage loop gain and an error between a command voltage and the detected voltage; and a PWM control unit configured to generate the PWM control signal by using the control voltage and control the rectifier.

An AC/DC converter including: an H bridge; an inductance in series with an input of the bridge; an inductance in series with an output of the bridge; and a circuit capable of controlling the bridge alternately to a first configuration where first and second diagonals of the bridge are respectively conductive and non-conductive, and to a second complementary configuration, the circuit being capable, during a phase of transition between the first and second configurations, of: turning on a first switch of the second diagonal; turning off a first switch of the first diagonal when the current flowing through this switch takes a zero value; turning on the second switch of the second diagonal; and turning off the second switch of the first diagonal when the current flowing through this switch takes a zero value.

A power converter device includes: a rectifier configured to convert AC power into DC power based on a PWM control signal; a voltage detecting unit configured to detect a voltage of a smoothing capacitor that is connected on a DC side of the rectifier; a capacitance estimating unit configured to estimate capacitance of the smoothing capacitor; a voltage control unit configured to calculate a voltage loop gain from the estimated capacitance and generate a control voltage from the voltage loop gain and an error between a command voltage and the detected voltage; and a PWM control unit configured to generate the PWM control signal by using the control voltage and control the rectifier.

A power conversion system includes a first rectifier and a second rectifier. The first rectifier is configured to operate at a first operating frequency. The first rectifier is configured to be connected with a three-phase power source. A first amount of power flows through the first rectifier from the three-phase power source. The second rectifier is configured to operate at a second operating frequency. The second rectifier is configured to be connected in parallel with the first rectifier, and a second amount of power flows through the second rectifier from the three-phase power source. The second operating frequency is higher than the first operating frequency, and the second amount of power is a fraction of the first amount of power.

A power conversion device converts AC voltage into DC voltage. The power conversion device includes a transformer, a first capacitor, a primary circuit, a rectifying-smoothing circuit, and a controller. The primary circuit includes a bridge circuit having two arm switching elements, and is connected to a primary winding of the transformer via the first capacitor. The rectifying-smoothing circuit includes a secondary diode and an output capacitor. The primary circuit includes a buffer circuit having a buffer capacitor and a buffer switching element. The controller controls switching of switching elements.

A multi-phase network power supply with compensation for harmonic oscillations relates to electrical engineering and is intended for supplying various electrical devices connected to a multi-phase alternating-current electrical network. The technical result of the claimed solution consists in lessening harmonic components, reducing pulsations in the voltage and current output by the power supply, and significantly reducing the required power. The multi-phase alternating-current network power supply with compensation for harmonic oscillations comprises a main multi-phase rectifier of the alternating-current network, an additional multi-phase rectifier, a controller and an additional voltage or current supply, wherein the positive terminal of the main multi-phase rectifier is capable of being connected to a load, and the negative terminal of the main multi-phase rectifier is connected to the positive terminal of the additional voltage or current supply, the negative terminal of which is capable of being connected to a load, the output terminals of the additional multi-phase rectifier are connected to the input terminals of the additional voltage or current supply, wherein the additional multi-phase rectifier is equipped with electronic switches, one in the circuit of each rectifying element, and each electronic switch is connected to the controller.

The invention relates to an electromechanical assembly comprising: an alternator with a wound rotor; a regulator acting on the excitation of the alternator; a rectifier at the outlet of the alternator, supplying a rectified voltage to a continuous bus; and a booster circuit connected by means of a filter to the outlet of the alternator and supplying a voltage to the continuous bus.

A converter system and a method for operating a converter system having block-type energy feedback, in particular, includes: a power inverter that feeds energy back to an AC-voltage supply system, i.e. in particular a first power inverter; a DC/DC transformer having a control unit; and an electric motor, which is able to be fed by a second power inverter. The DC-voltage-side terminal of the second power inverter is connected to a first terminal of the DC/DC transformer 102, and a current-acquisition device for acquiring the current conveyed by the DC/DC transformer to the terminal of the regenerative power inverter on the DC-voltage side is connected to a control unit, e.g., such that the current values acquired by the current-acquisition device are supplied to the control unit. The control unit supplies to the DC/DC transformer control signals such that the voltage supplied by the DC/DC transformer to the regenerative power inverter, the acquired current is able to be controlled, in particular controls, to a setpoint-value characteristic.