3779 results about "DC-BUS" patented technology

High voltage direct current systems to connect direct current energy sources to an alternating current system. In one aspect, a system includes a plurality of direct current modules having variable direct current inputs; an inverter; and a direct current bus to connect the direct current modules to the inverter, where the bus is configured to operate at a nominal voltage higher than 100 volts and to operate within 10 percent of the nominal operating voltage.

The disclosed embodiments increase the power generated by a photovoltaic (PV) array, when the PV panels within the PV array are not uniformly illuminated or oriented or when PV panels are mismatched (e.g., have varying performance characteristics) and / or operate at non-uniform temperatures. It also provides simpler interconnection and wiring of the elements (e.g., PV panels) of the array. A dc-dc converter comprised of a DC transformer is coupled to each PV panel in a photovoltaic array to generate an increased dc voltage from a lower dc voltage produced by the PV panel. The outputs of the dc-dc converters are connected in parallel to a dc bus, which distributes the resulting voltage. As a result, the energy generated by the PV array is increased, the costs of system design and installation are reduced, and it becomes feasible to install PV arrays in new locations such as on gabled or non-planar roofs.

A power management system for a vehicle. The system may be flexibly configured using various arrangements of DC to AC inverters, DC to DC converters AC to DC converters, DC to AC converters and AC to AC converters, one or more batteries, and a control portion to provide an AC bus, a primary DC bus and a secondary DC bus. The control portion monitors the status of the buses, inverters and converters and controls the operation of the inverters and converters to supply and regulate the power supplied by the buses. The inverters and converters may be bidirectional, allowing power to be transferred between buses.

A modular emergency power system architecture (200) with a plurality of output power supply lines for feeding power to a destination, in which the operational status of each output power supply line is configurable. The architecture comprises a plurality of load bars (208, 209) from which power is delivered to the destination. The load bars (208, 209) are selectively connectable to send power to or receive AC power from a mains supply (202) and / or a DC bus (210) via one or more AC / DC power conversion modules (212, 214). The DC bus (210) is connected to receive a secondary (e.g. emergency) power supply (218, 224). The architecture may provide redundancy and on-the-fly reconfigurability to complement changes in the physical location of critical components in the destination, e.g. caused by virtualisation, zoning or repair. The architecture is operable as a stand-alone uninterruptible power supply (UPS) or as an extended runtime generator for an existing UPS.

A hybrid electric vehicle includes a high voltage DC bus and an internal combustion engine. The internal combustion engine is mechanically coupled to a non self-excited generator / motor which is preferably a switched reluctance machine. A power inverter electrically and bidirectionally couples the high voltage DC bus to the non self-excited switched reluctance generator / motor. Front and rear axle dual DC-AC inverters electrically and bidirectionally couple two traction AC non self-excited switched reluctance motors / gear reducers to the high voltage DC bus for moving the vehicle and for regenerating power. An ultracapacitor coupled to the high voltage DC bus. A bidirectional DC-DC converter interposed between a low voltage battery and the high voltage DC bus transfers energy to the high voltage DC bus and ultracapacitor to ensure that the non self-excited switched reluctance generator / motor operating in the motor mode is able to start the engine.

The invention discloses a control method for a grid-connected power generation system of an optical storage microgrid. According to the method, a photovoltaic power generation power supply is connected with a direct-current (DC) bus through a boost converter, and an energy storage module is connected with the DC bus through a bidirectional DC-DC converter; a DC side of a DC-AC (Alternating Current) grid-connected inverter is connected with the DC bus, and an AC side of the DC-AC grid-connected inverter passes through a filtering inductor and then is connected with a power grid and a load respectively; the photovoltaic power generation power supply is subjected to maximum power tracking control and constant-voltage control respectively through a boost converter control strategy according to the charging state of the energy storage module, the output power of the photovoltaic power generation power supply, the voltage drop conditions of grid connected points and the reactive power demand set value of the power grid, the charging and discharging of the energy storage module are controlled through a bidirectional DC-DC converter control strategy, and the voltage of the grid connected points is stabilized through a DC-AC grid-connected inverter control strategy. The method disclosed by the invention has the advantages that the stable grid connection of the optical storage microgrid is guaranteed, and the quality of electric power of the power grid is improved; the multi-functionalization of the grid-connected inverter is realized, and the cost is reduced; the new energy absorption capacity of the power grid is enhanced, so as to meet the demands of the power grid.

A power factor corrected boost converter circuit includes a rectifier connectable to an ac input and having a rectified dc output provided across a dc bus, an inductor having first and second terminals connected in one leg of the dc bus, an integrated circuit comprising a control circuit for controlling a switch, the integrated circuit including a housing enclosing the control circuit, the integrated circuit having a power terminal, a ground terminal, a first control input terminal coupled to an output of the converter circuit, and a second control input terminal coupled to a sensor for sensing current in the dc bus and further having an output terminal connected to the switch, a boost rectifier diode having a first terminal, the diode coupled to the inductor, and a storage capacitor connected to the diode. The control circuit comprises a one cycle control circuit having an integrator reset by a clock signal for each cycle of the clock signal. The circuit further includes any or all of an inrush current limiting circuit for limiting the current through the inductor to a value below a predetermined level, a fan motor speed controller and a housekeeping power supply controller.

The power unit includes H bridge inverter circuit, capacitance in DC section connected to DC bus in inverter circuit, and control circuit for controlling operation of the power unit. The power unit also includes a clipping energy consumption circuit. Combining a small quantity of active power absorbed by active electric power filter, the method realizes controlling DC bus voltage of power unit. The active electric power filter includes following parts: inverter with each phase including at least one power unit; voltage detection circuit, central control system, filtering circuit, precharge circuit, income line switch, interface and communication circuit, and cooling unit etc.

A circuit for controlling an ac machine comprises a full bridge network of commutation switches which are connected to supply current for a corresponding voltage phase to the stator windings, a plurality of diodes, each in parallel connection to a respective one of the commutation switches, a plurality of dc source connections providing a multi-level dc bus for the full bridge network of commutation switches to produce sinusoidal voltages or PWM signals, and a controller connected for control of said dc source connections and said full bridge network of commutation switches to output substantially sinusoidal voltages to the stator windings. With the invention, the number of semiconductor switches is reduced to m+3 for a multi-level dc bus having m levels. A method of machine control is also disclosed.

In one aspect, a cloud cube for providing energy efficient cloud computing is disclosed, which includes: an internal DC bus for transferring energy, clusters of computing servers coupled to the internal DC bus for performing cloud computing, at least one NAS storage coupled to the internal DC bus, at least one energy storage coupled to the internal DC bus, a plurality of energy sources coupled to the internal DC bus, and at least one energy manager coupled to the internal DC bus for performing energy management or energy routing.In another aspect, a system for providing energy efficient cloud computing is disclosed, which includes: a DC grid having a plurality of interconnected energy sources, and a plurality of cloud cubes connected by the DC grid such that energy can be routed and shared among the cloud cubes.