68results about "Dc circuit with intermediate ac" patented technology

The invention relates to the technical field of voltage control, in particular to a time-delay-containing uncertain AC / DC micro-grid DC bus voltage control method, which comprises the following steps: acquiring load change and DC bus voltage fluctuation data, calculating a load current change rate, analyzing the correlation between voltage fluctuation and load change, and performing voltage adjustment. And time delay characteristics in a load state are identified, voltage fluctuation uncertainty factors are identified, and the time delay compensation amount is adjusted to restore the voltage stability. According to the invention, by adopting linear and nonlinear time-delay compensation strategies, the problem of accuracy of time-delay compensation under different load conditions is effectively solved, various load fluctuations and voltage changes can be dynamically adapted, the problem of uncertainty of voltage fluctuations is solved, and the prediction of voltage fluctuations is optimized by dynamically adjusting the weight of uncertainty factors. The over-reaction to sudden voltage change is reduced, the voltage stability is improved, and the operation stability and the voltage regulation precision of the micro-grid are remarkably improved.

A method and apparatus for detecting a fault close to a grounding circuit in a high voltage direct current (HVDC) power transmission system. The HVDC power transmission system includes a first converter device having a first terminal and a second terminal, a second converter device having a third terminal and a fourth terminal, a transmission cable connecting the first terminal with the third terminal, and a neutral line connecting the second terminal with the fourth terminal. The method includes generating an alternating current signal by a source converter device, such that a major portion of the generated alternating current signal flows through a direct current circuit (DC, circuit) including a stray capacitance associated with the transmission cable and a return path. The method further includes measuring current at a number of points in the power transmission system and detecting a fault electrically close to the grounding circuit.

Provided is a moving body used in a power transmission system that charges a storage battery mounted on the moving body with power generated by a power generation facility and feeds the power to a power receiving facility from the storage battery transported by the moving body. This moving body is provided with a battery control device that causes the storage battery to be charged with the supply of power based on a voltage value that does not reach a maximum voltage value of direct-current power between the power generation facility and the power receiving facility.

There is disclosed a self-contained welfare cabin having an electrical system with a bespoke user interface. The electrical system has an energy store, an electrical energy generator and a plurality of appliances connected to the electrical system to be powered in use by the energy store and / or electrical energy generator. A control system is arranged to selectively deny power to one or more appliance based on a predetermined control scheme, e.g. when the electrical demand of the appliances is greater than the supply by the energy store and / or generator. A user interface onboard the welfare cabin has a display and an input device for specifying a desired power delivery status for one or more of the appliances, wherein the control system outputs to the user interface details of the one or more appliance being denied power by the control system and the display displays said details to a user. The user interface may take the form of a touchscreen device through which a user can specify an appliance to be used and the control system can return a power denied or power supplied status for one or more appliance on the display.

A mobile body in a power transmission system in which a storage battery mounted on the mobile body is charged with power generated by a power generating facility, and power is supplied from the storage battery transferred by the mobile body to a power receiving facility. The mobile body is provided with a battery control device that charges the storage battery by power supply based on a voltage value that does not become the maximum voltage value of the DC power between the power generating facility and the power receiving facility.

The invention discloses a high-power efficient direct current converter, and relates to the technical field of power electronics. The high-power and high-efficiency direct-current converter comprises an inverter circuit of which the input side is electrically connected with a direct-current input side and which is used for converting direct-current voltage input by the direct-current input side into alternating-current voltage to be output; the input side of any isolation transformation rectification circuit is electrically connected with the output side of the inversion circuit, and the isolation transformation rectification circuit comprises an isolation transformation module and a rectification circuit; the input side of the non-isolation adjusting circuit is used for being electrically connected with the second rectification output side of the corresponding isolation conversion rectification circuit, the output side of the non-isolation adjusting circuit is used for being electrically connected with a corresponding load, and the non-isolation adjusting circuit is used for adjusting the direct-current voltage provided by the second rectification output side and then outputting the direct-current voltage. According to the embodiment of the invention, DC voltage conversion can be effectively realized.

A transport climate control system is disclosed. The transport climate control system includes a self-configuring matrix power converter having a charging mode, an inverter circuit, a controller, a first DC energy storage and a second DC energy storage, and a compressor. The first DC energy storage and the second DC energy storage have different voltage levels. During the charging mode, the inverter circuit is configured to convert a first AC voltage from an energy source to a first DC voltage, the controller is configured to control the self-configuring matrix power converter to convert the first DC voltage to a first output DC voltage to charge the first DC energy storage, and / or to a second output DC voltage to charge the second DC energy storage.

A vehicle system includes DC / DC converters configured to receive electrical currents from high voltage battery modules and output regulating electrical currents to a low voltage battery. The vehicle system includes a control system coupled to the DC / DC converters, the high voltage battery modules, and the low voltage battery, where the control system is configured to control the DC / DC converters to recirculate one or more of the electrical currents back to one or more of the high voltage battery modules in order to balance states of charge in the high voltage battery modules.

A transformer circuit (100) for an electric vehicle comprises an input (104); an output (106); and a transformer (108) located between the input and the output. The transformer comprises a primary winding (110) connected to the input; and a secondary winding (102) connected to the output. At least one of the primary winding and the secondary winding comprises a first split winding (112) and a second split winding (114). The first split winding is configured for carrying a higher current than the second split winding. The circuit comprises switching means (116) configured to, where the primary winding comprises the first and second split windings, selectively connect the first split winding to the input, or connect the first and second windings in series to the input, and where the secondary winding comprises the first and second split windings, selectively connect the first split winding (112) to the output (106), or connect the first and second split windings (112, 114) in series to the output.

Disclosed is an electrical generation system (1) for powering at least one aircraft electrical network, comprising a control device (2) configured to determine a first parameterization setting (PCONs1) for a first converter (C1) and a second parameterization setting (PCONS2) for a second converter (C2), the control device (2) being configured to determine a first power target (PBp1*) according to a distribution voltage setting (VDc*) and a measurement of the distribution voltage (VDc), and a second power target (PBP2*) from a measurement of the first power (PBP), a measurement of the second power (PHP) and a generation setting (PEcu), the second power target (PBP2*) being selected by default as the first power setting (PBP*), the first power target (PBP1*) being selected in case of a malfunction of the power supply by the second converter (C2).

This document describes systems for and techniques of alternating-current (AC) power harmonic-based circuit state detection. In various aspects, a system includes a component, a bypass circuit for the component, and a controller with an AC power harmonic-based circuit state detector that can determine a state of the bypass circuit. The AC power harmonic-based circuit state detector may convert an AC voltage of the AC power to a direct current (DC) voltage, filter the DC voltage to obtain a voltage of a harmonic of the AC power, and compare the voltage of the harmonic to a threshold to determine that the bypass circuit is in a fault state (blown fuse). By so doing, the controller of the system can notify a user that the bypass circuit needs to be reset or replaced to reenable operation of the system and avoid poor user experience typically associated with a non- or mis-functioning system.

An apparatus and system for power conversion and a method for operating the apparatus are provided. The apparatus comprises: at least one first partial power converter (PPC) string connected in parallel with a DC bus, the at least one first partial power converter (PPC) string comprising at least one series connected PPC and at least one PPC group, where each PPC group comprises more than one parallel connected PPC, where in each PPC group, the at least one first partial power converter (PPC) string is connected in parallel with the DC bus, and the at least one first partial power converter (PPC) string is connected in parallel with the DC bus. The respective outputs of each of the more than one PPC connected in parallel are connected in parallel to form an output of the PPC group, and wherein, in the first PPC string, the at least one series-connected PPC and the respective outputs of each of the at least one PPC group are connected in series, and wherein, in the second PPC string, the at least one series-connected PPC and the respective outputs of each of the at least one PPC group are connected in series. For each PPC of the at least one series-connected PPC and more than one parallel-connected PPC of the at least one PPC group, an input of the PPC is connected to a corresponding power source, and the input of the PPC and an output of the PPC have one common terminal.

An electrical network includes feed-in means, loads, and a distribution network located therebetween which includes at least one dynamic isolator and busbars. The feed-in means and the loads together with associated busbars are disposed in groups which can be electrically interconnected or disconnected by the at least one dynamic isolator. The at least one dynamic isolator monitors the voltage on the busbars adjacent thereto for a voltage difference. In a normal state without a voltage difference, the at least one dynamic isolator electrically disconnects the groups from one another, and in the event of a voltage difference between the busbars adjacent thereto, the at least one dynamic isolator electrically connects the groups to one another.

The invention belongs to the technical field of power supply architectures, and particularly relates to a computing power center power supply architecture and method based on a multi-level direct-current transformer, and the architecture comprises a medium-voltage multi-level direct-current converter which is connected with a high-voltage direct-current bus of a flexible direct-current power distribution station; the medium-voltage multi-level direct-current converter is formed by sequentially connecting a multi-level NPC converter, a high-frequency transformer and a rectifying circuit; wherein the input end of the multi-level NPC converter is connected with a high-voltage direct-current bus, the output end of the multi-level NPC converter is coupled to the rectifying circuit through the high-frequency transformer, and the output end of the rectifying circuit provides a medium-voltage direct-current bus. According to the power supply framework, the medium-voltage multi-level direct-current converter is adopted to convert high-voltage direct current into medium-voltage direct current, the medium-voltage multi-level direct-current converter is formed by sequentially connecting the multi-level NPC converter, the high-frequency transformer and the rectifying circuit in series, the rectifying link in a traditional alternating-current power supply framework is eliminated, and energy loss is reduced.

There is provided a method and apparatus for detecting a fault close to a grounding circuit in a high voltage direct current (HVDC) power transmission system. The HVDC power transmission system comprises a first converter device having a first terminal and a second terminal, a second converter device having a third terminal and a fourth terminal, a transmission cable connecting the first terminal of the first converter device with the third terminal of the second converter device, and a neutral line connecting the second terminal of the first converter device with the fourth terminal of the second converter device. The method comprises the steps of: generating an alternating current signal by a source converter device, such that a major portion of the generated alternating current signal flows through a direct current circuit (DC, circuit) comprising a stray capacitance associated with the transmission cable and a return path. The source converter device may be either of the first converter device or the second converter device. The source converter device is located electrically close to the grounding circuit. The method further comprises the steps of measuring current at a plurality of points in the power transmission system and detecting a fault electrically close to the grounding circuit based on the measured currents.

The embodiments of this application relate to a multi-motor integrated power circuit, a motor power control method and an electronic device; a power input conversion circuit converts a power input signal from a standby power source to a busbar power signal; a power factor correction circuit converts and superposes an AC input signal of the AC power source to / with the busbar power signal; a first isolation circuit converts the busbar power signal to an isolation output signal; a first switch sub-circuit converts the busbar power signal to a first AC signal; an isolation transformer converts the first AC signal to two or more second AC signals; a first power conversion circuit or an isolation transformer converts the isolation output signal or the second AC signal to a DC drive signal; a second power conversion circuit converts the isolation output signal or the second AC signal to an AC drive signal.

A method to control an automatic machine (1) for the production or the packaging of smoking, hygiene, food or pharmaceutical products; the automatic machine (1) comprising the steps of: controlling electric motors (5, 6) in an intermittent manner, cyclically alternating a motion state, in which each motor has an acceleration phase (AP) followed by a deceleration phase (DP), and a stop state, in which each electric motor (5, 6) is still; and at least partially supplying power, preferably for more than 50%, during the acceleration phase (AP) of each electric motor (5, 6), to the corresponding first static power converter (7, 8) by means of an electric current provided by the capacitor (17).

An embodiment of the disclosure provides a flexible multiport energy routing system comprising a first port configured to connect to an AC grid, a plurality of second ports configured to connect to a plurality of devices, a step-down transformer, a power converter stack, and a third port. The step-down transformer can a high voltage side electrically coupled to the first port and a low voltage side. The power converter stack can comprise a plurality of power converter modules each having a first converter bridge connected to the low voltage side of the step-down transformer and a second converter bridge connected to one or more of the plurality of second ports. Each of the power converter modules can have a converter transformer connected between the first and second converter bridges. The first and second converter bridges can bidirectionally manage AC and DC power flows between the first, second, and third ports.

A power generation system (1) for powering at least one aircraft power network is disclosed, the system comprising a control device (2) configured to determine a first parameterized setpoint (PCONS1) of a first converter (C1) and a second parameterized setpoint (PCONS2) of a second converter (C2). The control device (2) is configured to determine a first power target (PBP1 *) as a function of the distribution voltage setpoint (VDC *) and the measured value of the distribution voltage (VDC), and to determine a second power target (PBP2 *) as a function of the measured value of the first power (PBP), the measured value of the second power (PHP), and the power generation setpoint (PECU). Default selection of the second power target (PBP2 *) as a first power setpoint (PBP *); in the event of a failure in the power supply of the second converter (C2), the first power target value (PBP1 *) is selected as a first power setpoint value (PBP *).

The present invention relates to a power module device and a transport refrigeration system. The power module device is used for equipment powered by batteries or / and fuels, has a working mode and includes: a DC buck module or / and a DC boost module, the DC buck module is configured to buck-convert the DC provided by at least the battery into a low-voltage output DC for output, and the DC boost module is configured to boost the low-voltage input DC provided by the equipment powered by fuel into a high-voltage DC for output; and a control module, which is connected to the transport refrigeration unit and controls the operation of the DC buck module or / and the DC boost module in the working mode. The application of the present invention can effectively save layout space, simplify the original complex wiring harness connection layout, reduce costs, and bring great convenience to the operation and maintenance of equipment such as transport refrigeration units, and can be compatible with and applied to many types of equipment powered by batteries and / or fuel cells.

A method to control an automatic machine (1) for the production or the packaging of smoking, hygiene, food or pharmaceutical products; the automatic machine (1) comprising the steps of: controlling electric motors (5, 6) in an intermittent manner, cyclically alternating a motion state, in which each motor has an acceleration phase (AP) followed by a deceleration phase (DP), and a stop state, in which each electric motor (5, 6) is still; and at least partially supplying power, preferably for more than 50%, during the acceleration phase (AP) of each electric motor (5, 6), to the corresponding first static power converter (7, 8) by means of an electric current provided by the capacitor (17).

The invention relates to an electrolysis system (10) comprising an electrolysis plant (1, 1A, 1B) and a power supply source (3) with a direct voltage output (7) and comprising a central supply line (5), wherein the central supply line (5) is connected to the direct voltage output (7) of the power supply source (3) such that a direct current can be fed to the central supply line (5), wherein a central DC high-performance strand designed for the direct voltage is provided, to which high-performance strand the electrolysis plant (1) is connected via the central supply line (5), wherein at least the power supply source (3) and the DC high-performance strand are designed as a network (17) insulated from ground. The invention also relates to the use of an insulated DC network (17) in an electrolysis system (1).

There is disclosed a self-contained welfare cabin having an electrical system with a bespoke user interface. The electrical system has an energy store 64, an electrical energy generator 48 and a plurality of appliances connected to the electrical system to be powered in use by the energy store and / or electrical energy generator. A control system is arranged to selectively deny power to one or more appliance based on a predetermined control scheme, e.g. when the electrical demand of the appliances is greater than the supply by the energy store and / or generator. A user interface onboard the welfare cabin has a display and an input device for specifying a desired power delivery status for one or more of the appliances, wherein the control system outputs to the user interface details of the one or more appliance being denied power by the control system and the display displays said details to a user. The user interface may take the form of a touchscreen device through which a user can specify an appliance to be used and the control system can return a power denied or power supplied status for one or more appliance on the display.

The invention relates to an energy transmission device of an AC voltage charger, in particular designed as a bidirectional AC voltage charger. Wherein the control device is connected to the network AC voltage converter, the first switched intermediate circuit converter, the second switched intermediate circuit converter, the first in-vehicle network voltage circuit converter, the second in-vehicle network voltage circuit converter, the first traction network voltage circuit converter and the second traction network voltage circuit converter, the control device is configured to conduct energy through the transmission intermediate circuit to one or more of the connections from the following connection group when an AC voltage is applied to the AC voltage connection, the coupling group includes a first in-vehicle network voltage coupling, a second in-vehicle network voltage coupling, a first traction network voltage coupling, and a second traction network voltage coupling.

The invention relates to an aircraft power supply system (PSS) configured to power onboard electrical devices (D1, D2, D3, D4, D5, D6) comprising at least: - a high-voltage DC electrical subcircuit (HVDCN), - a low-voltage AC electrical subcircuit (LPACN), - a low-voltage DC electrical subcircuit (LPDCN), the system (PSS) further comprising a high-voltage battery switching circuit (HVBATSW), the system (PSS) being such that any power supply line to said low-voltage DC subcircuit, independent of said switching circuit (HVBATSW), is free of low-voltage batteries. Advantageously, this avoids battery redundancy, which is detrimental to the aircraft's weight (AC) and leads to increased complexity in its electrical system.

A field device having first and second input terminals connected to first and second wires of a network; first and second output terminals connected to first and second wires of a sensor unit; a rectifier unit having a first part arranged between the first input terminal and a first node and a second part arranged between the second input terminal and a second node, wherein the first node is connected to the first output terminal. A current measurement device measures a current between the second node and a third node. A voltage measurement device measures a voltage between the first node and the second node. A first semiconductor is arranged between the first node and the third node and configured to pass a bypass current so that the measured current comprises a two-part curve; and a second semiconductor arranged between the third node and the second output terminal.

The invention discloses a method and device for detecting the feasibility of direct current power supply of alternating current electrical equipment, which relates to the technical field of direct current power supply, and comprises the following steps: performing a power supply switching test on the alternating current electrical equipment to obtain performance comparison results and abnormality comparison results; performing a feasibility assessment based on the performance comparison results and the abnormality comparison results, and classifying the feasibility of direct current power supply of the equipment; simulating the equipment of the feasible class after optimization, and optimizing the alternating current to direct current scheme; and establishing an optimization effect evaluation model to generate an optimization effect evaluation value, comparing the optimization effect evaluation value with a preset optimization effect reference value, and classifying the optimization effect; by comparing and classifying the optimization effects, a comprehensive and scientific evaluation system is formed, which ensures the accurate judgment of the feasibility of direct current power supply of the alternating current electrical equipment.

The invention relates to an electrolysis system (10) comprising an electrolysis device (1, 1A, 1B), a current supply source (3) having a DC voltage output (7), and a central supply line (5), the central supply line (5) being connected to the DC voltage output (7) of the current supply source (3) such that a DC current can be fed into the central supply line (5), according to the invention, a central direct-current high-power cable designed for the direct-current voltage is provided, the electrolysis device (1) is connected to the direct-current high-power cable via a central power supply line (5), at least the current supply source (3) and the direct-current high-power cable being a network (17) insulated from the earth. The invention also relates to a use of an insulated DC network (17) in an electrolysis system (1).

The present disclosure relates to the field of field devices. The field device includes: a first input terminal configured to be connected to a first wire of a network; a second input terminal configured to be connected to a second wire of the network; a first output terminal configured to be connected to a first wire of the sensor unit; a second output terminal configured to be connected to a second wire of the sensor unit; a rectifier unit, a first portion of which is arranged between the first input terminal and the first node, and a second portion of which is arranged between the second input terminal and the second node; a current measuring device arranged between the second node and the third node; a voltage measurement means for measuring a measurement voltage between the first node and the second node; a first semiconductor disposed between the first node and the third node, and configured to pass a bypass current through the first semiconductor such that the measured current includes a two-part curve; and a second semiconductor disposed between the third node and the second output terminal.