A power conversion apparatus capable of improving an EMI characteristic and an air conditioner including the same are disclosed. The power conversion apparatus includes an inverter including a plurality of switching elements corresponding to three phases, a gate driver configured to drive the switching elements of the inverter, and a noise reducer connected to the gate driver and configured to set switching noise occurrence times caused by the switching elements in the respective phases to be different.

A method of controlling a power converter, connected to an electrical grid, to mimic a synchronous generator, by: determining a frequency control error with respect to a setpoint and actual frequency of the grid, determining an input power to an inertia model of a synchronous generator based on the frequency control error, regulating by means of the input power a rotational frequency of the inertia model, determining a voltage control error with respect to a setpoint and actual voltage, determining an exciter parameter of a synchronous generator model based on the voltage control error, regulating by means of the exciter parameter an output voltage of the synchronous generator model, adjusting the rotational frequency or a phase angle obtained from the rotational frequency, and the output voltage based on a virtual impedance of a stator of the synchronous generator model, and controlling the power converter based on the adjusted rotational frequency or the adjusted phase angle and on the adjusted output voltage.

A method of controlling a power converter, connected to an electrical grid, to mimic a synchronous generator, by: determining a frequency control error with respect to a setpoint and actual frequency of the grid, determining an input power to an inertia model of a synchronous generator based on the frequency control error, regulating by means of the input power a rotational frequency of the inertia model, determining a voltage control error with respect to a setpoint and actual voltage, determining an exciter parameter of a synchronous generator model based on the voltage control error, regulating by means of the exciter parameter an output voltage of the synchronous generator model, adjusting the rotational frequency or a phase angle obtained from the rotational frequency, and the output voltage based on a virtual impedance of a stator of the synchronous generator model, and controlling the power converter based on the adjusted rotational frequency or the adjusted phase angle and on the adjusted output voltage.

A P terminal that is connected to an armature coil, an LIN terminal for LIN communications, and an interface circuit are provided, and the interface circuit converts serial signals which are input from the P terminal and the LIN terminal into parallel signals and transmits scan test signals input from the P terminal and the LIN terminal to a digital circuit and transmits a scan test signal output from the digital circuit to the LIN terminal.

A P terminal that is connected to an armature coil, an LIN terminal for LIN communications, and an interface circuit are provided, and the interface circuit converts serial signals which are input from the P terminal and the LIN terminal into parallel signals and transmits scan test signals input from the P terminal and the LIN terminal to a digital circuit and transmits a scan test signal output from the digital circuit to the LIN terminal.

A method for determining a droop response profile of a rotating electrical machine supplying electricity to an electrical network having a network frequency varying on either side of a nominal frequency, wherein a measured rotational speed value and droop response parameters are defined. The droop response profile is a graph centered on the coordinates ([X5; Y5]) of an origin point between 99% and 101% of the measured speed value and defined by at least two coordinate points ([X4,Y4], [X0, Y0]) in the case of over-speed, each of the points having as abscissa a speed value as a percentage of the measured speed value, and for ordinates a filtered speed value as a percentage of the measured speed value modulated by at least one of the droop response parameters.

A method for determining a droop response profile of a rotating electrical machine supplying electricity to an electrical grid having a network frequency varying on either side of a nominal frequency, in which a measured value of the rotation speed of the rotating machine is retrieved, and the droop response parameters dependent on the measured speed value are defined. The droop response profile is a graph centered on the coordinates of an origin point between 99% and 101% of the measured speed and defined by at least two points of coordinates in the case of underspeed and/or by at least two points of coordinates in the case of overspeed, each of the points having for its abscissa a speed value as a percentage of the measured speed, and for the ordinates, a filtered speed value as a percentage of the measured speed modulated by at least one of the droop response parameters.

A method for determining a droop response profile of a rotating electrical machine supplying electricity to an electrical grid having a network frequency varying on either side of a nominal frequency, in which a measured value of the rotation speed of the rotating machine is retrieved, and the droop response parameters dependent on the measured speed value are defined. The droop response profile is a graph centered on the coordinates of an origin point between 99% and 101% of the measured speed and defined by at least two points of coordinates in the case of underspeed and/or by at least two points of coordinates in the case of overspeed, each of the points having for its abscissa a speed value as a percentage of the measured speed, and for the ordinates, a filtered speed value as a percentage of the measured speed modulated by at least one of the droop response parameters.

A frequency of an AC voltage of an AC grid present at a genset is defined by an UPS. The frequency is altered in one direction away from a desired frequency, if a power demand increases beyond a power supply in the AC grid, and in the other direction, if the power demand falls below the power supply. An alteration of the frequency in the one direction is limited to a maximum value in that missing power is temporarily fed out of an energy storage of the UPS into the AC grid. A shift of the frequency in the one direction is kept until no more power flows out of the energy storage. The genset responds to deviations of the frequency of the AC voltage from the desired frequency in the one and the other direction by an increase and a decrease of supplied genset power, respectively.

The invention described herein generally pertains to a system and method related to an engine-driven welding device that generate a welding voltage and an auxiliary voltage using a rotor/stator assembly at various frequency settings or revolutions per minute while maintaining outputs for the welding voltage and the auxiliary voltage. A welding device can include a field controller component and/or a controller that is configured to detect a change in a frequency setting or an engine speed. In response to such detection, the field controller component can be configured to adjust an excitation voltage in order to maintain a voltage output used for a welding voltage or an auxiliary power voltage power.