Abstract: A wind power generation system includes a power generator body, an auxiliary device that assists the power generator body, and a power conversion apparatus that converts first AC power generated by the power generator body to second AC power, and outputs the second AC power to an electric power grid. The power conversion apparatus includes a first power conversion circuit, a second power conversion circuit, a power storage element that receives DC power from the first power conversion circuit via a first passing point, a breaker, and a control unit. When the power generator body is in a power generation standby state, the control unit sets a parallel-off mode and controls the second power conversion circuit to convert power of the power storage element to third AC power having a preset voltage. The auxiliary device is configured to receive the second AC power or the third AC power.

Abstract: A wind power generation system with a power storage device includes a wind power generation system, a power storage device system, and a reactive power controller. The wind power generation system includes a wind power generator, a first power conversion circuit, a first control circuit, a first filter capacitor, and a circuit breaker interposed between the first filter capacitor and a grid connection point. The wind power generation system is configured to output the electric power converted by the first power conversion circuit to an electric power grid via the grid connection point. The power storage device system includes a power storage device, a second power conversion circuit, and a second control circuit that controls the second power conversion circuit to perform load leveling operation. The reactive power controller causes the second power conversion circuit to perform reactive power compensation operation.

Abstract: A power conversion system including a plurality of power conversion devices connected in parallel. Each of the plurality of power conversion devices includes: a power conversion circuit configured to convert DC to AC; and an AC filter circuit connected to an output side of the power conversion circuit. The AC filter circuit is an LC low-pass filter including a first filter reactor and an AC filter capacitor connected in an L shape. The AC filter circuit further includes a second filter reactor connected in series to the AC filter capacitor, and a resistance constructing a series circuit together with the AC filter capacitor and the second filter reactor.

Abstract: A wind power generation system with a power storage device includes a wind power generation system, a power storage device system, and a reactive power controller. The wind power generation system includes a wind power generator, a first power conversion circuit, a first control circuit, a first filter capacitor, and a circuit breaker interposed between the first filter capacitor and a grid connection point. The wind power generation system is configured to output the electric power converted by the first power conversion circuit to an electric power grid via the grid connection point. The power storage device system includes a power storage device, a second power conversion circuit, and a second control circuit that controls the second power conversion circuit to perform load leveling operation. The reactive power controller causes the second power conversion circuit to perform reactive power compensation operation.

Abstract: A power conversion apparatus includes a plurality of power conversion units, a common bus bar, and a plurality of unit bus bars provided so as to correspond to the plurality of the power conversion units respectively and connecting each DC side of the plurality of the power conversion units to the common bus bar. Each of the power conversion units includes a casing having a first surface on which a first outer plate of a magnetic material is arranged, and the first outer plate is arranged in a vicinity of a corresponding unit bus bar and faces the corresponding unit bus bar with a gap so that an inductance value of the corresponding unit bus bar is increased to an inductance value capable of suppressing an inflow of a ripple current from another power conversion unit in the power conversion apparatus.

Abstract: A wind power generation system includes a power generator body, an auxiliary device that assists the power generator body, and a power conversion apparatus that converts first AC power generated by the power generator body to second AC power, and outputs the second AC power to an electric power grid. The power conversion apparatus includes a first power conversion circuit, a second power conversion circuit, a power storage element that receives DC power from the first power conversion circuit via a first passing point, a breaker, and a control unit. When the power generator body is in a power generation standby state, the control unit sets a parallel-off mode and controls the second power conversion circuit to convert power of the power storage element to third AC power having a preset voltage. The auxiliary device is configured to receive the second AC power or the third AC power.

Abstract: A power conversion apparatus includes a plurality of power conversion units, a common bus bar, and a plurality of unit bus bars provided so as to correspond to the plurality of the power conversion units respectively and connecting each DC side of the plurality of the power conversion units to the common bus bar. Each of the power conversion units includes a casing having a first surface on which a first outer plate of a magnetic material is arranged, and the first outer plate is arranged in a vicinity of a corresponding unit bus bar and faces the corresponding unit bus bar with a gap so that an inductance value of the corresponding unit bus bar is increased to an inductance value capable of suppressing an inflow of a ripple current from another power conversion unit in the power conversion apparatus.

Abstract: A power conversion apparatus includes a first power conversion circuit including a first switching element, a second power conversion circuit including a second switching element, a DC conductor which is provided in the first power conversion circuit and supplies a DC power to the first power conversion circuit, and a connection conductor which is provided in the first power conversion circuit, has a length having an inductance for inhibiting a flow of a ripple current caused by switching of the second switching element of the second power conversion circuit, and connects the DC conductor and the second power conversion circuit.

Abstract: A method for manufacturing a vehicle bearing apparatus includes a method for manufacturing a hub ring. The hub ring includes a seal facing surface, a flange portion, and a shaft body portion. The flange portion includes a thin portion, a thick portion, bolt holes, a thin portion outer surface, a thick portion outer surface, and bolts. The flange portion protrudes outward from the shaft body portion. The thick portion is formed on an outer side with respect to the bolt holes in the flange portion, and the thin portion is formed on an inner side with respect to the thick portion in the flange portion. In the method for manufacturing the hub ring, machining is performed on the thick portion outer surface by using the seal facing surface subjected to grinding, as a reference surface, after the bolts are fitted into the flange portion.

Abstract: An object is to obtain a low-frequency circuit breaker which has a simple configuration and a small size as a whole and is advantageous in view of costs. There is provided a low-frequency circuit breaker, in which a semiconductor switch and a mechanical switch are connected in parallel with each other. The semiconductor switch is configured by connecting a thyristor and a thyristor in anti-parallel with each other. These members are controlled by the circuit breaker control circuit.

Abstract: A method for manufacturing a vehicle bearing apparatus includes a method for manufacturing a hub ring. The hub ring includes a seal facing surface, a flange portion, and a shaft body portion. The flange portion includes a thin portion, a thick portion, bolt holes, a thin portion outer surface, a thick portion outer surface, and bolts. The flange portion protrudes outward from the shaft body portion. The thick portion is formed on an outer side with respect to the bolt holes in the flange portion, and the thin portion is formed on an inner side with respect to the thick portion in the flange portion. In the method for manufacturing the hub ring, machining is performed on the thick portion outer surface by using the seal facing surface subjected to grinding, as a reference surface, after the bolts are fitted into the flange portion.

Abstract: There is provided a power converter apparatus including a detector detecting a system voltage, and a controller stably outputting power generated by the wind power generator to the power system based on a power instruction value and controlling an output voltage to stabilize the system voltage based on a voltage instruction value in a case where the system voltage is within a preset range, and controlling an active current component and a reactive current component of an output current to stabilize the system voltage of the power system by use of a voltage drop due to impedance of the power system in a case where the system voltage is outside the preset range.

Abstract: An object is to obtain a low-frequency circuit breaker which has a simple configuration and a small size as a whole and is advantageous in view of costs. There is provided a low-frequency circuit breaker, in which a semiconductor switch and a mechanical switch are connected in parallel with each other. The semiconductor switch is configured by connecting a thyristor and a thyristor in anti-parallel with each other. These members are controlled by the circuit breaker control circuit.

Abstract: An object is to obtain a low-frequency circuit breaker which has a simple configuration and a small size as a whole and is advantageous in view of costs. There is provided a low-frequency circuit breaker, in which a semiconductor switch and a mechanical switch are connected in parallel with each other. The semiconductor switch is configured by connecting a thyristor and a thyristor in anti-parallel with each other. These members are controlled by the circuit breaker control circuit.

Abstract: A power conversion apparatus includes a first power conversion circuit including a first switching element, a second power conversion circuit including a second switching element, a DC conductor which is provided in the first power conversion circuit and supplies a DC power to the first power conversion circuit, and a connection conductor which is provided in the first power conversion circuit, has a length having an inductance for inhibiting a flow of a ripple current caused by switching of the second switching element of the second power conversion circuit, and connects the DC conductor and the second power conversion circuit.

Abstract: A method for manufacturing a vehicle bearing apparatus includes a method for manufacturing a hub ring. The hub ring includes a seal facing surface, a flange portion, and a shaft body portion. The flange portion includes a thin portion, a thick portion, bolt holes, a thin portion outer surface, a thick portion outer surface, and bolts. The flange portion protrudes outward from the shaft body portion. The thick portion is formed on an outer side with respect to the bolt holes in the flange portion, and the thin portion is formed on an inner side with respect to the thick portion in the flange portion. In the method for manufacturing the hub ring, machining is performed on the thick portion outer surface by using the seal facing surface subjected to grinding, as a reference surface, after the bolts are fitted into the flange portion.

Abstract: An object is to obtain a low-frequency circuit breaker which has a simple configuration and a small size as a whole and is advantageous in view of costs. There is provided a low-frequency circuit breaker, in which a semiconductor switch and a mechanical switch are connected in parallel with each other. The semiconductor switch is configured by connecting a thyristor and a thyristor in anti-parallel with each other. These members are controlled by the circuit breaker control circuit.