Abstract: A control device includes a generator simulating unit to generate a phase of output voltage of a power converter by simulating characteristics of a synchronous generator, a first voltage command generating unit to generate a first voltage command value of output voltage of the power converter so that an AC voltage of a power grid attains a target voltage, a setting unit to set an overcurrent level, and a second command generating unit to generate a second voltage command value by limiting the first voltage command value based on the overcurrent level. The control device further includes a signal generating unit to generate a control signal for the power converter, based on the phase generated by the generator simulating unit and the second voltage command value.

Abstract: A motor-driven compressor for a vehicle includes a control device and a detection circuit. The detection circuit includes an AD conversion circuit. The AD conversion circuit converts an on-voltage from an analog signal to a digital signal. The control device is configured to determine that a battery is in an overvoltage state and stop the motor-driven compressor for the vehicle when a value of the on-voltage detected from the digital signal is larger than an overvoltage determination threshold value.

Abstract: A power conversion device includes a power converter and a control device. The power converter converts a DC power output from a power storage element into an AC power. The control device includes a phase synchronizing unit to estimate a reference phase of an output voltage of the power converter synchronized with a phase of an AC voltage at an interconnection point, a characteristics simulating unit to generate an active power command value based on a phase difference between a reference phase and the phase of the AC voltage at the interconnection point, a DC voltage command generating unit to generate a DC voltage command value, a voltage command generating unit to generate an AC voltage command value so that an output current of the power converter becomes less than a threshold, and a signal generating unit to generate a control signal based on the AC voltage command value.

Abstract: A liquid coating device includes a storage container, a drain unit, a supply unit, and circuitry. The storage container stores a treatment liquid to be applied to coating targets. The drain unit drains the treatment liquid from the storage container for a drain amount. The supply unit supplies the treatment liquid to the storage container. The circuitry sets a target value related to the drain amount of the treatment liquid smaller than a total capacity of the storage container, calculates a degradation degree of the treatment liquid in the storage container, controls the drain unit to drain the treatment liquid for the drain amount based on the target value when the degradation degree exceeds a threshold of the degradation degree, and controls the supply unit to supply the treatment liquid for a supply amount corresponding to the drain amount.

Abstract: A coating device includes a reservoir to store a coating liquid, a coating roller to coat a sheet with the coating liquid, a pressure roller to contact the coating roller, a separator to bring and separate the pressure roller into contact with and from the coating roller, a supply unit to supply the coating liquid to the reservoir, a drain unit to drain the coating liquid from the reservoir, a liquid level detector to detect that a liquid level of the coating liquid is below a non-supply position, and circuitry. The circuitry controls the drain unit to drain the coating liquid after a power-off of the coating device, controls the separator to bring the pressure roller into contact with the coating roller after a detection of the liquid level below the non-supply position, and rotate the pressure roller and the coating roller for a predetermined time as an idle rotation.

Abstract: An image forming system includes an image forming mechanism configured to form an image on a recording medium and a processor configured to stop rotation of a rotating member in the image forming mechanism when time, calculated by subtracting time required for image quality adjustment of an image to be formed from time required for post-processing of a recording medium on which an image is formed in a post-processing apparatus, is longer than set threshold time.

Abstract: An open and close device, a sheet conveyor, and an image forming apparatus. The open and close device includes an open and close portion to open or shut, a biasing mechanism to bias the open and close portion in an opening direction, and a holder to hold the open and close portion shut. The biasing mechanism includes a first spring whose biasing force is invariable regardless of a stroke of the first spring, and a second spring whose biasing force is variable due to a stroke of the second spring. The sheet conveyor includes the open and close device, and the open and close portion includes a conveyor to convey a sheet. The image forming apparatus includes the sheet conveyor.

Abstract: A treatment-agent liquid applicator includes an application roller to apply a treatment agent to a medium to be conveyed to an image forming apparatus, a pressure roller to press the medium against the application roller, a supply roller to supply the treatment agent to the application roller, and circuitry configured to rotate the application roller for a duration of time, from when job information is acquired by the image forming apparatus, to when the medium reaches the application roller.

Abstract: A device attaches and detaches at least one of rollers in a belt conveyor in which an endless belt is wound around the rollers between a front plate and a rear plate of the belt conveyor. The device includes a guide and a roller holder. The guide has a base end and extends along a longitudinal direction of the detachable roller and includes a guide groove. The roller holder holds the detachable roller and includes an engagement portion, another engagement portion, and a guided portion. The engagement portion detachably engages with the front plate. The other engagement portion detachably engages with the rear plate. The guided portion slides along the guide groove toward the rear side or the front side of the device to engage or disengage the engagement portion with or from the front plate and engage or disengage the other engagement portion with or from the rear plate.

Abstract: A power converter interchanges electric power between a power storage device and a power grid as the power storage device is charged and discharged. A control device controls active power inputted and outputted between the power grid and the power converter. The control device generates a command value indicating an amount of output of active power for increase in grid frequency or an amount of input of active power for lowering in grid frequency, in accordance with an amount of frequency variation calculated from a frequency detection value of the power grid. Furthermore, the control device restricts output of active power in accordance with the command value when the frequency detection value is larger than a frequency reference value of the power grid and restricts input of active power in accordance with the command value when the frequency detection value is smaller than the frequency reference value.

Abstract: A power conversion device includes a power converter connected to a power storage element, and a control device. The control device includes a generator simulating unit to generate a voltage command value, and a signal generating unit to generate a control signal for the power converter based on the voltage command value. The generator simulating unit includes a first characteristics simulating unit to generate a first command value by simulating characteristics of a first synchronous generator, a second characteristics simulating unit to generate a second command value by simulating characteristics of a second synchronous generator different from the characteristics of the first synchronous generator, an adder to perform addition of the first command value and the second command value, and a voltage command generating unit to generate the voltage command value, based on an addition result of the first command value and the second command value.

Abstract: A dryer includes: a conveyor belt having a shape of an endless loop to convey a sheet in a conveyance direction; a drying unit facing an absorption surface of the conveyor belt to dry the sheet on the absorption surface; and an absorber including multiple suction members inside the endless loop of the conveyor belt, the suction members arrayed in the conveyance direction to absorb the sheet onto the absorption surface of the conveyor belt, and at least one suction member of the multiple suction members to generate a suction force different from suction forces of other suction members.

Abstract: A heating device includes a heater and a cover to cover the heater. In the heating device, the cover includes a first cover disposed in a first direction of the heater and a second cover disposed in the first direction, and the second cover is adjacent to the first cover. In the heating device, the first cover and the second cover have a gap in between, and the gap has a length greater than an amount of thermal deformation of either one of the first cover or the second cover or a total amount of thermal deformation of the first cover and the second cover.

Abstract: An attachment mechanism includes a first holding member and a second holding member. The first holding member is configured to hold a device side plate of a belt device to attach a main body side plate of an apparatus in which the belt device is incorporated. The second holding member is configured to be fixed to the first holding member. The first holding member and the second folding member are configured to adjust a posture of the device side plate with respect to the main body side plate in assembly of the belt device.

Abstract: A power conversion device includes a power converter connected to a power storage element, and a control device. The control device includes a generator simulating unit to generate a voltage command value, and a signal generating unit to generate a control signal for the power converter based on the voltage command value. The generator simulating unit includes a first characteristics simulating unit to generate a first command value by simulating characteristics of a first synchronous generator, a second characteristics simulating unit to generate a second command value by simulating characteristics of a second synchronous generator different from the characteristics of the first synchronous generator, an adder to perform addition of the first command value and the second command value, and a voltage command generating unit to generate the voltage command value, based on an addition result of the first command value and the second command value.

Abstract: A control device includes a generator simulating unit to generate a phase of output voltage of a power converter by simulating characteristics of a synchronous generator, a first voltage command generating unit to generate a first voltage command value of output voltage of the power converter so that an AC voltage of a power grid attains a target voltage, a setting unit to set an overcurrent level, and a second command generating unit to generate a second voltage command value by limiting the first voltage command value based on the overcurrent level. The control device further includes a signal generating unit to generate a control signal for the power converter, based on the phase generated by the generator simulating unit and the second voltage command value.

Abstract: A power conversion device includes a power converter and a control device. The power converter converts a DC power output from a power storage element into an AC power. The control device includes a phase synchronizing unit to estimate a reference phase of an output voltage of the power converter synchronized with a phase of an AC voltage at an interconnection point, a characteristics simulating unit to generate an active power command value based on a phase difference between a reference phase and the phase of the AC voltage at the interconnection point, a DC voltage command generating unit to generate a DC voltage command value, a voltage command generating unit to generate an AC voltage command value so that an output current of the power converter becomes less than a threshold, and a signal generating unit to generate a control signal based on the AC voltage command value.

Abstract: A power converter interchanges electric power between a power storage device and a power grid as the power storage device is charged and discharged. A control device controls active power inputted and outputted between the power grid and the power converter. The control device generates a command value indicating an amount of output of active power for increase in grid frequency or an amount of input of active power for lowering in grid frequency, in accordance with an amount of frequency variation calculated from a frequency detection value of the power grid. Furthermore, the control device restricts output of active power in accordance with the command value when the frequency detection value is larger than a frequency reference value of the power grid and restricts input of active power in accordance with the command value when the frequency detection value is smaller than the frequency reference value.

Abstract: An open and close device, a sheet conveyor, and an image forming apparatus. The open and close device includes an open and close portion to open or shut, a biasing mechanism to bias the open and close portion in an opening direction, and a holder to hold the open and close portion shut. The biasing mechanism includes a first spring whose biasing force is invariable regardless of a stroke of the first spring, and a second spring whose biasing force is variable due to a stroke of the second spring. The sheet conveyor includes the open and close device, and the open and close portion includes a conveyor to convey a sheet. The image forming apparatus includes the sheet conveyor.

Abstract: A storage battery system includes a first storage battery unit. First storage battery unit includes a first converter that converts alternating current and direct current, a first storage battery, and a first controller that controls first converter, and first storage battery unit is interconnected to a system for supplying power. The first controller detects a frequency of the system, and controls first converter such that first storage battery outputs constant active power to the system on the basis of the frequency of the system falling below a first threshold value.