Abstract: A capacitor according to the present disclosure is provided with: a plurality of capacitor elements arranged side by side in a housing; positive electrode conductors that each connect the positive electrode of each capacitor element with the positive electrode of a power module; negative electrode conductors that each connect the negative electrode of each capacitor element with the negative electrode of the power module while holding the plurality of capacitor elements between the positive and negative electrode conductors; insulation portions that are provided in the housing to fill spaces between the inner surfaces of the housing, the plurality of capacitor elements, the positive electrode conductors, and the negative electrode conductors and thereby insulate the same from each other; and a conductive plate that is formed from a material with higher heat conductivity than the insulation portions and that is disposed, with the intermediation of the insulation portions, between a positive electrode conductor

Abstract: Disclosed is a short-circuit protection circuit including: a voltage dividing circuit that divides a power supply voltage supplied from a power supply connected to one end thereof; a semiconductor rectifying element, one end of which is connected between resistance elements of the voltage dividing circuit and the other end of which is connected onto a path of a conductive wire connected to a current-inflow-side terminal of a semiconductor switch element to be protected, the connection being made such that a direction from the one end to the other end becomes a rectifying direction; an RC parallel circuit connected to the other end of the voltage dividing circuit; and a drive unit that turns off the semiconductor switch element when it is detected that a short-circuit current flows through the conductive wire, on the basis of a voltage of a capacitor element of the RC parallel circuit, in a case in which the semiconductor switch element is turned on, wherein a stray capacitance of the semiconductor rectifying

Abstract: This operation mode selection device selects an operation mode of a ship power system including one or a plurality of generators and batteries, the operation mode is determined through at least the number of generators in operation, the selection of a generator to be operated, a load sharing ratio of the generator and a battery, the selection of charging and discharging of the battery, and the device comprises a reinforcement learning unit which selects the operation mode; and performing reinforcement learning on a software agent.

Abstract: An electric switchboard according to the present disclosure includes: a power converter housed in a casing; an intake port and an exhaust port; a fan that causes air in the casing to flow from the intake port to the exhaust port; a first partition section dividing the inside of the casing into a first region where a low-heat-generation component is arranged and a second region where no low-heat-generation component is arranged; and a second partition section that is arranged downstream of the first partition section and divides the second region into an inner region where a high-heat-generation component is arranged and an outer area where no high-heat-generation component is arranged. The first partition section has a first inlet through which air in the casing flows into the first region, and a first outlet through which air that has flowed through the first region flows out to the second region.

Abstract: Provided is a control device comprising a control unit that controls respective flow rates of a refrigerant distributed to respective power converters each having a power module within a range in which each predetermined temperature of the plurality of power converters does not exceed each temperature management values.

Abstract: This charging system is connected between the two terminals of at least one capacitor in the input of a plurality of power converters and charges the capacitor when a first switching element and a second switching element are turned off.

Abstract: A protection device is capable of protecting a load drive system at an appropriate timing according to a temperature of a power semiconductor. The protection device includes: a capacitor configured to output a voltage according to a charge accumulated by a first current; and a protection circuit configured to: (i) determine whether or not the voltage output by the capacitor exceeds a certain threshold value; (ii) generate a second current having a magnitude according to information related to the temperature of the power semiconductor which drives a load; and (iii) change a magnitude of the first current based on the second current.

Abstract: There is provided a protection device capable of protecting a load drive system at an appropriate timing according to the temperature of a power semiconductor. A protection device includes: a capacitor that outputs a voltage according to a charge accumulated by a first current; and a protection circuit that determines whether or not the voltage output by the capacitor exceeds a certain threshold value, generates a second current having a magnitude according to information related to the temperature of a power semiconductor which drives a load, and changes the magnitude of the first current based on the generated second current.

Abstract: An energization evaluation test equipment for an input filter of a large capacity PWM converter by reducing the power supply capacity to the equipment under test is provided. The energization evaluation test is equivalent to an actual load test. An equipment under test has an input filter connected to an output terminal of an AC power source and a PWM converter connected to an output terminal of the input filter to convert an AC power source to a DC power source.

Abstract: An energization evaluation test equipment for an input filter of a large capacity PWM converter by reducing the power supply capacity to the equipment under test is provided. The energization. evaluation test is equivalent to an actual load test. An equipment under test has an input filter connected to an output terminal of an AC power source and a PWM converter connected to an output terminal of the input filter to convert an AC power source to a DC power source.

Abstract: A controller includes a torque command value calculation module configured to calculate a torque command based on a speed command of the motor, an output voltage controlling module configured to control an output voltage of the power converter based on the torque command calculated by the torque command value calculation module, a voltage command value correcting module configured to correct a voltage command to the power converter based on a measured output voltage from the power converter, a flux estimation module configured to estimate stator flux and rotor flux of the motor in a subsequent control period based on the voltage command by the voltage command value correcting module and a measured current of the stator and a motor speed estimation module configured to estimate a speed of the motor in a subsequent control period based on the flux estimated by the flux estimation module.

Abstract: A controller includes a torque command value calculation module configured to calculate a torque command based on a speed command of the motor, an output voltage controlling module configured to control an output voltage of the power converter based on the torque command calculated by the torque command value calculation module, a voltage command value correcting module configured to correct a voltage command to the power converter based on a measured output voltage from the power converter, a flux estimation module configured to estimate stator flux and rotor flux of the motor in a subsequent control period based on the voltage command by the voltage command value correcting module and a measured current of the stator and a motor speed estimation module configured to estimate a speed of the motor in a subsequent control period based on the flux estimated by the flux estimation module.