A capacitor module includes a capacitor element, a plurality of connection terminals for electrically connecting the capacitor element to a semiconductor module and a power supply that are another equipment, and an exterior coating that includes a resin film having electrical insulating property and wraps the capacitor element except the plurality of connection terminals.

A capacitor module includes a capacitor element, a plurality of connection terminals for electrically connecting the capacitor element to a semiconductor module and a power supply that are another equipment, and an exterior coating that includes a resin film having electrical insulating property and wraps the capacitor element except the plurality of connection terminals.

A capacitor module includes a smoothing capacitor, a P-side Y capacitor and a N-side Y capacitor as noise absorbing capacitors, a capacitor case, a P-side bus bar, a N-side bus bar, and a ground bus bar. A virtual plane along a P-side electrode surface, which is an electrode surface on a high potential side of the smoothing capacitor, is referred to as a P-side virtual plane. A virtual plane along a N-side electrode surface, which is an electrode surface on a low potential side of the smoothing capacitor, is referred to as a N-side virtual plane. A region between the P-side virtual plane and the N-side virtual plane is defined as a PN region. The entire noise absorbing capacitor and the entire ground bus bar are arranged in the PN region.

A capacitor module includes a smoothing capacitor, a P-side Y capacitor and a N-side Y capacitor as noise absorbing capacitors, a capacitor case, a P-side bus bar, a N-side bus bar, and a ground bus bar. A virtual plane along a P-side electrode surface, which is an electrode surface on a high potential side of the smoothing capacitor, is referred to as a P-side virtual plane. A virtual plane along a N-side electrode surface, which is an electrode surface on a low potential side of the smoothing capacitor, is referred to as a N-side virtual plane. A region between the P-side virtual plane and the N-side virtual plane is defined as a PN region. The entire noise absorbing capacitor and the entire ground bus bar are arranged in the PN region.

An exemplary renewable-energy system including a back end system coupled to an isolated DC power source and a generator powered by a renewable energy source and including first circuitry configured to convert first AC power from the generator to DC power and to provide the DC power to a DC power bus, the first circuitry further configured to initiate operation using power from the isolated DC power source. The example system further includes a front end system comprising an inverter coupled to an isolated DC power source generator. The inverter includes a ground isolation monitor interrupter (IMI) circuit coupled to the DC power bus and configured to receive the DC power and convert the DC power to second AC power for provision to a power grid. The isolated power source generator ground-isolates third AC power of the power grid for conversion to DC power for the isolated DC power source.

Provided is a method of controlling wind turbine converters of wind turbines parallel connected at a point of common coupling, the method including: generating for each converter within a same length of a pulse width modulation period a pulse, wherein the pulses start for different converters at different pulse start phases, wherein pulse start phase differences of the pulse start phases between at least two of adjacent converters are unequal.

A power conditioner includes a PV converter that generates an output voltage, which is obtained by boosting a direct-current voltage input from a solar panel, an inverter that converts the output voltage of the PV converter into an alternating-current voltage, and a first relay connected between the inverter and a commercial power system. A controller includes a control circuit that controls the entire power conditioner, a control circuit that controls the PV converter, and a control circuit that controls the inverter. In a start process, the control circuit controls activation and deactivation of a DC-DC converter and causes the impedance of a DC-DC converter to change. The control circuit detects an input voltage and an input current of the PV converter and determines whether or not the first relay is to be in a close state according to those values.

A photovoltaic power generation system includes a plurality of photovoltaic cell arrays, a plurality of power conditioners connected respectively with the plurality of photovoltaic cell arrays, and a high order device connected to the plurality of power conditioners. The high order device is configured to execute: a first output control to adjust output power of a designated power conditioner to a predetermined output power amount being set in advance; and a second output control to adjust output power from a remaining power conditioner which is other than the designated power conditioner among the plurality of power conditioners. The high order device is configured to execute characteristic-data acquisition to acquire an input/output electrical characteristic of the designated power conditioner during execution of the first output control.

A semiconductor module includes a base member including a circuit board on which a positive electrode pad and a negative electrode pad are provided and on which a semiconductor device is mounted to be electrically coupled to the positive electrode pad and the negative electrode pad, a housing that is attached to the base member so as to surround the positive electrode pad and the negative electrode pad, the housing being formed in a frame shape, a first electrode plate that is electrically coupled to the positive electrode pad, the first electrode plate having a flat plate portion, and a second electrode plate that is electrically coupled to the negative electrode pad, the second electrode plate having a flat plate portion. The flat plate portion of the first electrode plate and the flat plate portion of the second electrode plate are arranged in a parallel-plate configuration within the housing.

A resonant converter and a manufacturing method of a transformer thereof are provided. The resonant converter includes a full bridge circuit, an element, a first branch circuit, a second branch circuit and a secondary winding. The full bridge circuit includes a first node and a second node. The element includes an inductor or a capacitor. The first branch circuit includes a first primary winding. The second branch circuit includes a second primary winding, and the first and second primary windings have the same turn number. The transformer is constructed by the first and second primary windings and the secondary winding. The first branch circuit, the element and the second branch circuit are sequentially coupled in series between the first and second nodes. The first branch circuit and the second branch circuit are symmetrically located with respect to the element. The first and second branch circuits have the same impedance.