Abstract: According to one embodiment, a pumped-storage power generation control device includes a control section that controls at least one of the pumping input of the pumped-storage power generation facility in the pumping operation and the power output of the pumped-storage power generation facility in the power generating operation such that a value, which is obtained by a predetermined calculation using the measurement value relating to the pumping input of the pumped-storage power generation facility in the pumping operation and the measurement value relating to the power output of the pumped-storage power generation facility in the power generating operation, becomes a set target value.

Abstract: According to one embodiment, a control system includes a chopper, a short-circuit unit, a voltage detector circuit, and a controller. The chopper reduces a direct current voltage between a converter connected to a stator in a wound induction machine and an inverter connected to a rotor in the wound induction machine. The short-circuit unit shorts a wire used for connection between the rotor and the inverter and the voltage detector circuit is to detect the direct current voltage. The controller causes driving the chopper and, at the same time, outputting from the inverter an alternating current over which a direct current component is superimposed when a voltage value exceeds a first predetermined value, and causes driving the short-circuit unit and, at the same time, halting the inverter when the voltage value exceeds a second predetermined value.

Abstract: According to one embodiment, a control system includes a chopper, a short-circuit unit, a voltage detector circuit, and a controller. The chopper reduces a direct current voltage between a converter connected to a stator in a wound induction machine and an inverter connected to a rotor in the wound induction machine. The short-circuit unit shorts a wire used for connection between the rotor and the inverter and the voltage detector circuit is to detect the direct current voltage. The controller causes driving the chopper and, at the same time, outputting from the inverter an alternating current over which a direct current component is superimposed when a voltage value exceeds a first predetermined value, and causes driving the short-circuit unit and, at the same time, halting the inverter when the voltage value exceeds a second predetermined value.

Abstract: According to one embodiment, a pumped-storage power generation control device includes a control section that controls at least one of the pumping input of the pumped-storage power generation facility in the pumping operation and the power output of the pumped-storage power generation facility in the power generating operation such that a value, which is obtained by a predetermined calculation using the measurement value relating to the pumping input of the pumped-storage power generation facility in the pumping operation and the measurement value relating to the power output of the pumped-storage power generation facility in the power generating operation, becomes a set target value.

Abstract: According to one embodiment, an over-voltage prevention device includes a first short-circuit device provided between a secondary side of a wound-rotor induction machine and a frequency converter configured to excite the secondary side by a three-phase AC current and having a function of short-circuiting between phases of the three-phase AC current, resistors each connected between the first short-circuit device and the frequency converter for each phase, and second short-circuit devices connected respectively to the resistors in parallel and having a function of short-circuiting between the frequency converter and the secondary side of the wound-rotor induction machine.

Abstract: According to one embodiment, an over-voltage prevention device is provided between a secondary-winding side of a wound-rotor induction machine and a frequency converter configured to excite the secondary-winding side of the wound-rotor induction machine through a three-phase excitation power supply line. The over-voltage prevention device includes a first short-circuit device having a function of short-circuiting between phases of the excitation power supply line, and a second short-circuit device having a function of short-circuiting between phases of the excitation power supply line with a short-circuit impedance greater than a short-circuit impedance of the first short-circuit device.

Abstract: According to one embodiment, there is provided a variable speed control apparatus applied to a variable speed system of secondary excitation including a double feed synchronous machine and a frequency converter. The variable speed control apparatus includes a secondary current controller configured to control an output current from the frequency converter, and a secondary current limiter configured to limit an effective component current command and a reactive component current command of a secondary current for the secondary current controller by using a given secondary current limit value and output a limited result to the secondary current controller.

Abstract: In one embodiment, a flywheel power generating facility includes a flywheel power generator including a flywheel for storing rotational energy, and configured to convert the rotational energy into electric power to supply the electric power to a test facility. The generating facility further includes a driving motor configured to rotate the flywheel, and a power supply device configured to supply electric power to the driving motor. The generating facility further includes a detector configured to output a signal related to the rotation of the flywheel, and a controller configured to control operation of the driving motor, based on the outputted signal. The controller controls the operation of the driving motor so that the driving motor provides accelerating torque to the flywheel while the supply of the electric power to the test facility is stopped and while the electric power is supplied to the test facility.

Abstract: According to one embodiment, a test apparatus for a variable speed controller is provided. A generator motor computation unit computes behaviors of the generator motor, using a state quantity regarding the generator motor and a predetermined transfer function. An AC machine computation unit computes behaviors of the AC machine, using a state quantity regarding the AC machine and a predetermined transfer function. A power converter computation unit computes behaviors of the power converter, using a state quantity regarding the power converter and a predetermined transfer function. Each of the computation units uses computation results of other computation units.

Abstract: According to one embodiment, an over-voltage prevention device is provided between a secondary-winding side of a wound-rotor induction machine and a frequency converter configured to excite the secondary-winding side of the wound-rotor induction machine through a three-phase excitation power supply line. The over-voltage prevention device includes a first short-circuit device having a function of short-circuiting between phases of the excitation power supply line, and a second short-circuit device having a function of short-circuiting between phases of the excitation power supply line with a short-circuit impedance greater than a short-circuit impedance of the first short-circuit device.

Abstract: According to one embodiment, an over-voltage prevention device includes a first short-circuit device provided between a secondary side of a wound-rotor induction machine and a frequency converter configured to excite the secondary side by a three-phase AC current and having a function of short-circuiting between phases of the three-phase AC current, resistors each connected between the first short-circuit device and the frequency converter for each phase, and second short-circuit devices connected respectively to the resistors in parallel and having a function of short-circuiting between the frequency converter and the secondary side of the wound-rotor induction machine.

Abstract: According to one embodiment, there is provided a variable speed control apparatus applied to a variable speed system of secondary excitation including a double feed synchronous machine and a frequency converter. The variable speed control apparatus includes a secondary current controller configured to control an output current from the frequency converter, and a secondary current limiter configured to limit an effective component current command and a reactive component current command of a secondary current for the secondary current controller by using a given secondary current limit value and output a limited result to the secondary current controller.

Abstract: A mixing apparatus which makes it possible to monitor an internally-generated audio signal and an audio signal from an external apparatus not only in response to turning-on/off of a monitor switch but also in flexible and various manners when mixing those signals. The mixing apparatus is connected to at least one external apparatus, for inputting and mixing a plurality of audio signals and outputting a resulting mixed audio signal. The input audio signals are mixed into a mixed audio signal. The mixed audio signal and an audio signal input from the external apparatus are mixed using a predetermined monitor mix balance into a monitor output signal. A monitor switch is operated to switch between a plurality of monitor states. The predetermined monitor mix balance is changed according to a monitor state after switching by the monitor switch.

Abstract: In a mixer system having a digital mixer having functions of processing an audio signal in an input channel and outputting the signal via an ST bus, and a PC executing a DAW application realizing a function of plural tracks to record waveform data, a WET button corresponding to the input channel is provided to the digital mixer to select a DRY mode for inputting signal which is inputted from outside the device to the input channel, to the ST bus without sending the signal to the DAW application, or a WET mode for inputting signal which are inputted from outside the device to input channel, to the ST bus after sending the signal to the DAW application for processing and being sent back to the digital mixer, in response to a pressing of the WET button.

Abstract: In a mixer system having a digital mixer having functions processing waveform data in plural input channels and outputting the data via an ST bus, and a PC executing a DAW application realizing a function of plural tracks to record and reproduce waveform data, it is made possible to set a first mode instructing the digital mixer to process waveform data inputted from outside the system in all input channels and the DAW application to mix the waveform data in all tracks to supply to the ST bus of the digital mixer, and a second mode instructing the digital mixer to process waveform data received from the DAW application in all input channels and the DAW application to send the waveform data in all tracks to corresponding input channels of the digital mixer.

Abstract: In a mixer system having a digital mixer having functions processing waveform data in plural input channels and outputting the data via an ST bus, and a PC executing a DAW application realizing a function of plural tracks to record and reproduce waveform data, it is made possible to set a first mode instructing the digital mixer to process waveform data inputted from outside the system in all input channels and the DAW application to mix the waveform data in all tracks to supply to the ST bus of the digital mixer, and a second mode instructing the digital mixer to process waveform data received from the DAW application in all input channels and the DAW application to send the waveform data in all tracks to corresponding input channels of the digital mixer.

Abstract: In a mixer system having a digital mixer having functions of processing an audio signal in an input channel and outputting the signal via an ST bus, and a PC executing a DAW application realizing a function of plural tracks to record waveform data, a WET button corresponding to the input channel is provided to the digital mixer to select a DRY mode for inputting signal which is inputted from outside the device to the input channel, to the ST bus without sending the signal to the DAW application, or a WET mode for inputting signal which are inputted from outside the device to input channel, to the ST bus after sending the signal to the DAW application for processing and being sent back to the digital mixer, in response to a pressing of the WET button.

Abstract: There is provided an electronic apparatus which once makes a user conscious of copyright and the like of digital data, such as audio data and image data, when the user records the digital data or performs the like processing, and then allows the user to use the digital data without annoying him any longer concerning the copyright and the like of digital data, a data recording method for the electronic apparatus, and a storage medium storing a program for executing the data recording method. The electronic apparatus is capable of performing a plurality of processes including a specific process execution of which is restricted in advance. A notification section notifies a user of a message calling the user's attention to the specific process in response to an instruction issued on the specific process. A function-setting section sets a specific function according to the notification of the message.

Abstract: An operation apparatus is designed for use with a system to deal with operation information of the system. In the operation apparatus, an operation piece is manually operable to move in a linear or circular direction to a position indicative of the operation information. A detection section detects the position of the operation piece and outputs position data corresponding to the detected position. A drive section responds to position data inputted from the system to automatically move the operation piece to a position corresponding to the inputted position data. An acquiring section provisionally acquires a plurality of reference position data which are outputted from the detection section when the operation piece is placed at a plurality of reference positions such that the respective reference position data correspond to the respective reference positions.

Abstract: A mixing apparatus which makes it possible to monitor an internally-generated audio signal and an audio signal from an external apparatus not only in response to turning-on/off of a monitor switch but also in flexible and various manners when mixing those signals. The mixing apparatus is connected to at least one external apparatus, for inputting and mixing a plurality of audio signals and outputting a resulting mixed audio signal. The input audio signals are mixed into a mixed audio signal. The mixed audio signal and an audio signal input from the external apparatus are mixed using a predetermined monitor mix balance into a monitor output signal. A monitor switch is operated to switch between a plurality of monitor states. The predetermined monitor mix balance is changed according to a monitor state after switching by the monitor switch.