A higher control unit 1 generates a command current i* based on a command value. A model predictive control unit 2 sets a plurality of assumed voltage vectors for each switching cycle of an output voltage, divides the switching cycle of the output voltage into two periods according to a ratio between a dead time and the switching cycle of the output voltage, calculates a predicted current of the assumed voltage vector for each of the two periods obtained by the two-dividing, determines an evaluation function between the assumed voltage vector and the predicted current, sets the assumed voltage vector which has highest evaluation function result, as a command voltage vector. A gate signal g for outputting a voltage expressed by the command voltage vector from the power converter is output. The power converter is driven and controlled based on the gate signal.

A higher control unit 1 generates a command current i* based on a command value. A model predictive control unit 2 sets a plurality of assumed voltage vectors for each switching cycle of an output voltage, divides the switching cycle of the output voltage into two periods according to a ratio between a dead time and the switching cycle of the output voltage, calculates a predicted current of the assumed voltage vector for each of the two periods obtained by the two-dividing, determines an evaluation function between the assumed voltage vector and the predicted current, sets the assumed voltage vector which has highest evaluation function result, as a command voltage vector. A gate signal g for outputting a voltage expressed by the command voltage vector from the power converter is output. The power converter is driven and controlled based on the gate signal.

Systems and methods for providing AC power to a power grid using renewable energy sources as well as energy storage devices. A control system controls multiple DC/DC converters that are coupled to renewable energy sources as well as to one or more energy storage devices. The control system also controls the charge/discharge of the energy storage devices. Each DC/DC converter control block in the control system automatically detects whether to perform MPPT on the renewable energy source or to control the discharge of the energy storage devices. Each DC/DC converter control block ensures that power from the renewable energy source or from the energy storage device is converted and provided to the power grid.

A power conversion device includes: a power converter connected to an AC grid to which a load is connected; and a control circuit. The control circuit includes a harmonic compensation unit that includes a current command generation unit and a limit coefficient calculation unit and compensates for harmonic current contained in load current. The current command generation unit generates compensation current desired values for respective frequency components, and corrects the compensation current desired values using corresponding limit coefficients, to generate compensation current commands for respective frequency components. The limit coefficient calculation unit calculates each limit coefficient, on the basis of the compensation current desired value for each frequency component, and maximum voltage and maximum current that the power converter can output.

A power conversion device includes: a power converter connected to an AC grid to which a load is connected; and a control circuit. The control circuit includes a harmonic compensation unit that includes a current command generation unit and a limit coefficient calculation unit and compensates for harmonic current contained in load current. The current command generation unit generates compensation current desired values for respective frequency components, and corrects the compensation current desired values using corresponding limit coefficients, to generate compensation current commands for respective frequency components. The limit coefficient calculation unit calculates each limit coefficient, on the basis of the compensation current desired value for each frequency component, and maximum voltage and maximum current that the power converter can output.

An inverter is disposed adjacent to one end of a motor in a rotational axis direction. The inverter includes a plurality of power modules each including a switching element, a smoothing capacitor, busbars that connect the power modules to the smoothing capacitor, and a thin case that accommodates these components. The switching element is constituted by a silicon carbide metal oxide semiconductor field effect transistor (SiC MOSFET). The smoothing capacitor and each of the power modules are disposed in an inner portion of the thin case and arranged on the same plane orthogonal to the rotational axis direction.

An inverter is disposed adjacent to one end of a motor in a rotational axis direction. The inverter includes a plurality of power modules each including a switching element, a smoothing capacitor, busbars that connect the power modules to the smoothing capacitor, and a thin case that accommodates these components. The switching element is constituted by a silicon carbide metal oxide semiconductor field effect transistor (SiC MOSFET). The smoothing capacitor and each of the power modules are disposed in an inner portion of the thin case and arranged on the same plane orthogonal to the rotational axis direction.

A switch control module for a switch mode power supply comprising a biased switch, an active switch and a control unit. The biased switch comprises a first node and a second node. The first node is coupled to a primary side winding. The active switch is connected to the second node. The control unit controls the ON/OFF states of the active switch and the biased switch is biased to be turned on initially. In this way, the active switch and the control unit are less likely to be damaged by voltage spikes generated by leakage in the primary side winding.

A switch control module for a switch mode power supply comprising a biased switch, an active switch and a control unit. The biased switch comprises a first node and a second node. The first node is coupled to a primary side winding. The active switch is connected to the second node. The control unit controls the ON/OFF states of the active switch and the biased switch is biased to be turned on initially. In this way, the active switch and the control unit are less likely to be damaged by voltage spikes generated by leakage in the primary side winding.

There is provided a high frequency AC inverter comprising a DC-DC circuit, an output power circuit and a load circuit and a controller. The load circuit comprises a load circuit detector configured to detect the electrical parameters of the load circuit. The output power circuit comprises a DC to AC driver having a variable frequency output, a HFAC driver circuit and a transformer coupled to the HFAC driver circuit and the load circuit. The HFAC driver circuit comprises a resonant network resonant network comprising a first resonant tank, a second resonant tank and a third resonant tank, the first resonant tank comprising a series LC circuit and having a first resonant frequency, the second resonant tank comprising a parallel LC circuit and having a second resonant frequency, a third resonant tank comprising first part having a parallel LC circuit with a third resonant frequency and a second part comprising a series inductor, wherein the first resonant frequency, the second resonant frequency and the third resonant frequency are the same.