Abstract: A photovoltaic power generation system includes a photovoltaic power generation module, a capacitor, a DC/AC voltage converter, a filter, a relay, a PWM controller, a calculation module, a control module, and a grid. The control module traces the maximum power of the photovoltaic power generation module, and detects whether the grid is abnormal or not. Finally, the DC power outputted from the photovoltaic power generation module is transferred to the AC power and outputted to the grid via the DC/AC voltage converter by using the PWM controller.

Abstract: The present invention is directed to an electrical wiring device that includes a test circuit that is configured to generate a recurring simulated fault signal. A detection circuit is configured to generate a test detection signal in response to the recurring simulated fault signal. An end-of-life monitor circuit is configured to generate an end-of-life detection signal if the test detection signal is not generated within a first predetermined period of time. At least one indicator is configured to emit an indication signal in response to the end-of-life detection signal. A response mechanism is configured to decouple the plurality of line terminals from the plurality of load terminals after a second predetermined period of time has elapsed following the end-of-life detection signal.

Abstract: A power converter control system having a phase tracker that is designed and configured to estimate the phase of the voltage on the power network that will be on the network when network recovers from a fault on the network. Such a power converter control system allows a power-network-connected power source to ride-through a fault event and continue supplying power thereto at the designed phase and frequency. In one embodiment, the phase tracker provides this estimate by having a response time slow enough that the voltage drop or sag caused by the fault substantially does not affect the control system. In another embodiment, the phase detector is designed and configured to freeze the frequency of its output upon detection of a fault event on the power network.

Abstract: An electronic apparatus includes an electronic component electrically connected to a substrate positioned beneath the electronic component. A member includes a plurality of decoupling capacitors having different voltages, and the decoupling capacitors are electrically connected to the electronic component. A plurality of voltage planes in the member are electrically connected to the decoupling capacitors. The decoupling capacitors, via the voltage planes in the member, provide different voltages to the voltage planes and thus the electronic component.

Abstract: The invention relates to a method and a device for safely disconnecting electric drives, wherein disturbances of the electric drive which are independent from the driving and lifting speed are recognized in a delay-free manner by retaining the safety function and are used for disconnecting the electric drive. The signals of the sensors (7.1, 7.2, 8.1, 8.2) are detected in a redundant manner and are redundantly compared to preselected threshold values in evaluation devices (2.1, 2.2) such that the electric drive (12) is safely disconnected in a redundant manner without using mechanical position devices if the preselected threshold value of the electric drive (12) is exceeded.

Abstract: A load driving device according to the present invention includes: a first current generation section generating a first current in accordance with a driving current of a load; a second current generation section generating a predetermined second current; an integration section charging and discharging a capacitor in accordance with magnitude relation between the first current and the second current; a comparison section comparing a terminal voltage of the capacitor and a predetermined threshold voltage; and an output section generating a protection signal based on output logic of the comparison section. Such configuration permits appropriately preventing load burnout.

Abstract: The present invention relates to a speed protection system for monitoring the speed of a rotating shaft in a machine. The speed protection system includes a first speed detection system, a first time delay system, and a first time delay system. The first speed detection system determines a first rotational speed of the shaft in the machine. The first tripping system is coupled to the first speed detection system and to the machine. The first tripping system trips the machine to stop the rotation of the shaft when the first rotational speed is either less than a minimum speed or is more than a maximum speed. The first time delay system is coupled to the first tripping system. The first time delay system prevents the first tripping system from tripping the machine if the first rotational speed is less than the minimum speed until either a first period time has expired or the first rotational speed exceeds a first enabling speed.

Abstract: A control device for regulating the output voltage of a voltage regulator wherein the output from that regulator would normally be variable includes inputting that voltage to the control device. There are two overlapping bands which define an effective bandwidth between the upper limit of the lower band and lower limit of the upper band. The output of the device provides a signal responsively regulated in the effective bandwidth such that the output from the regulator can be similarly regulated. In power generation systems a narrow bandwidth can be effectively maintained to permit narrow variations of voltage. A micro-processor facilitates changing the regulated levels for the control device such that the output from the control device can be selectively and controllably changed as desired.

Abstract: An electronic monitoring circuit to detect unbalanced voltage conditions on a three phase alternating current line employs the charging current to a condenser connected across a full wave rectifier bridge to trigger a multivibrator circuit that controls an output relay in accordance with the multivibrator cycles per cycle of the power line voltage.

Abstract: As an improved way of effecting fast valving of turbines of power system steam-electric generating units for the purpose of improving the stability of power transmission over transmission circuits to which their generators make connection .Iadd., .Iaddend.when stability is threatened by line faults and certain other stability endangering events, and in which intercept valves are rapidly closed on a momentary basis, the procedure of intercept valve closure is supplemented by simultaneously initiating turbine and steam supply source control programs, which (a) .[.being.]. .Iadd.bring .Iaddend.into effect a sustained reduction in turbine driving power via employment of measures which may include full closing of some or all control valves and/or employment of preprogrammed control valve repositioning, with provision to automatically divert high pressure steam to the condenser or to atmosphere as a way to prevent discharge of steam through high pressure safety valves.