摘要:
Apparatus and associated method and computer program products involve a highly efficient uninterruptible power distribution architecture to support modular processing units. As an illustrative example, a modular processing unit includes an integrated uninterruptible power system in which a PFC-boost AC-to-DC conversion occurs between the utility AC grid and the processing circuit (e.g., microprocessor) loads. In an illustrative data center facility, a power distribution architecture includes a modular array of rack-mountable processing units, each of which has processing circuitry to handle network-related processing tasks. Associated with each modular processing unit is an integrated uninterruptible power supply (UPS) to supply operating power to the network processing circuitry. Each UPS includes a battery selectively connectable across a DC bus, and a AC-to-DC rectifier that converts an AC input voltage to a single output voltage on the DC bus. The regulated DC bus voltage may be close to the battery's fully charged voltage.
摘要:
A control methodology for an engine-driven electric machine (18) of a hybrid vehicle electrical system (22) for enabling continued operation of the vehicle electrical system (22) under failure mode conditions that require or result in disconnection of the battery pack (20) from the electrical system (22). At the onset of a fault condition requiring battery disconnection (102), the electric machine (18) is controlled to drive the battery pack current toward zero (118, 96, 98) before disconnecting the battery pack (20). Once the battery pack (20) is disconnected, whether by relay or fuse, the electric machine (18) is controlled to maintain the bus voltage of the electrical system (22) at a specified value (94-98). In both operating modes, the electric machine (20) is controlled based on a synchronous vector current command (94, 118) that is determined directly as a function of the control objective (zero battery pack current or maintaining bus voltage) for improved response time compared to a traditional torque-based control.
摘要:
The invention relates to an energy storing method and apparatus for use by end-users of energy, such as commercial property owners and operators. The system differs from past systems, insofar as it is not intended to be used by and in connection with energy suppliers, such as large utility and power supply plants and grids. The system preferably relates to the manner in which an end-user of energy can implement energy and costs savings, by using energy storage and time-shifting methods, to control and regulate the consumption of energy in a manner that achieves a cost savings over a period of time. One aspect of the method relates to accurately forecasting and predicting the energy demands and peaks that might occur on a daily basis, by recording and analyzing the prior day's history, as well as the overall energy demand histories, using short and long term forecasts, and then setting up a variable energy storage/use plan or schedule that helps to reduce the peak demands by time-shifting the energy that is used, i.e., reducing consumption during high demand/high cost periods, and using the energy stored during low demand/low cost periods during the high demand/high cost periods.
摘要:
A wind powered turbine (3) with low voltage ride-through capability. An inverter (28) is connected to the output of a turbine generator. The generator output is conditioned by the inverter resulting in an output voltage and current at a frequency and phase angle appropriate for transmission to a three-phase utility grid. A frequency and phase angle sensor is connected to the utility grid operative during a fault on the grid. A control system is connected to the sensor and to the inverter. The control system output is a current command signal enabling the inverter to put out a current waveform, which is of the same phase and frequency as detected by the sensor. The control system synthesizes current waveform templates for all three-phases based on a sensed voltage on one phase and transmits currents to all three-phases of the electrical system based on the synthesized current waveforms.
摘要:
An uninterruptible power supply (UPS) includes a plurality of UPS modules. Each of the UPS modules has a battery that provides power to a protected load in the event of a utility power failure. A plurality of controllers control how much power each of the batteries deliver to the protected load, and a communication bus allows the controllers to exchange information about the battery voltages. One of the controllers calculates the average battery voltage of the plurality of batteries and adjusts the amount of energy provided by an individual battery such that the battery voltage is about equal to the average battery voltage.
摘要:
Um ein Stabilisierungssystem für ein durch ein Stromeinspeisenetz gespeistes Stromversorgungsnetz umfassend ein an das Stromversorgungsnetz angeschlossenes Umformersystem mit einem Schwungradspeicher zu schaffen, welches in der Lage ist, die Spannung im Stromversorgungsnetz vorteilhaft zu stabilisieren, wird vorgeschlagen, daß mit dem Umformersystem dem Stromversorgungsnetz dann Leistung zuführbar ist, wenn im Stromversorgungsnetz die Aufschaltung einer Last erfolgt oder ein Energieerzeuger abgeschaltet wird, und dann Leistung entnehmbar ist, wenn im Stromversorgungsnetz ein Leistungsabwurf oder die Aufschaltung eines Energieerzeugers erfolgt.
摘要:
An electrical system for use in isolation, the electrical system comprising a main engine (14), such as a gas turbine or a diesel engine, a generator (13) driven by the main engine (14) for generating a first alternating voltage (19), a first rectifier unit (12) for converting the first alternating voltage (19) generated by the generator (13) into a direct voltage on a DC bus (18), and at least one inverter unit (10, 15) for converting the direct voltage of the DC bus (18) into a second alternating voltage (20). The generator (13) driven by the main engine (14) for generating the first alternating voltage (19) is an asynchronous machine coupled directly to the shaft of the main engine (14), and the first rectifier unit (12) also comprises an inverter part for converting the direct voltage of the DC bus (18) into an alternating voltage with an adjustable frequency to said asynchronous machine (13) so as to use the machine as a motor.
摘要:
An Uninterruptible Power Supply system comprising motor generator means for conditioning electric power; a backup generator means including an internal combustion engine having electrically driven starter, said starter operating at a voltage and an amperage, of providing a backup supply of electric power; electrical switch means, said switch means being electrically connected to the power mains and to the electrical output of the backup generator means and to the electrical input of the motor generator means for selectively switching power from the electric means and the backup generator to the motor generator means; starter switch means electrically connected to the output of the motor generator means and electrically connected to the input of the starter system of the backup generator means, for switchably connecting the electrical output of the motor generator means to the input of the starter system means; and sensor means responsive to the output of said electrical switch means and electrically connected starter switch means for closing the starter switch when the flow of electric power to the motor generator means is interrupted.
摘要:
A wind powered turbine (3) with low voltage ride-through capability. An inverter (28) is connected to the output of a turbine generator. The generator output is conditioned by the inverter resulting in an output voltage and current at a frequency and phase angle appropriate for transmission to a three-phase utility grid. A frequency and phase angle sensor is connected to the utility grid operative during a fault on the grid. A control system is connected to the sensor and to the inverter. The control system output is a current command signal enabling the inverter to put out a current waveform, which is of the same phase and frequency as detected by the sensor. The control system synthesizes current waveform templates for all three-phases based on a sensed voltage on one phase and transmits currents to all three-phases of the electrical system based on the synthesized current waveforms.