1255results about "Ac-dc network circuit arrangements" patented technology

The invention relates to the technical field of hydrogen production, in particular to a quick response system of a double-probe hydrogen leakage explosion detector and a grading early warning method. Comprising a first hydrogen concentration detection probe and a second hydrogen concentration detection probe which are respectively arranged at two different positions of a monitored area to form a space complementation detection network; the signal processing unit is electrically connected with the two probes and is used for receiving and processing the concentration signals output by the probes; the quick response control module is used for calculating the hydrogen concentration change rate in real time based on an output result of the signal processing unit; the grading early warning module is used for generating different grades of early warning signals according to the hydrogen concentration change rate and the absolute concentration value; the communication interface module is used for transmitting the early warning signal to a remote monitoring terminal; the multi-physical-field parameter change of the electrolyte can be sensed in real time, the control instruction is dynamically corrected, and the anti-interference capability is high.

The invention relates to a multi-source system comprising an electric machine (M), of the type comprising a rotor and a stator (1), the stator (1) comprising a plurality of windings (10, 11, 12) made of turns of insulated conductive material, each winding (10, 11, 12) comprising a plurality of independently powered coils (100, 101, 102), characterised in that the system also comprises a plurality of DC power sources and a plurality of power electronics converters associated with different coils (100, 101, 102) of the electric machine (M), each power source powering one or more power electronics converters and each power source being connected to at least one coil (100, 101, 102) of each winding (10, 11, 12) of the electric machine (M).

A power tool is provided including a power supply interface receiving a removable battery pack, a brushless direct current (BLDC) motor including a rotor and a stator, and a multi-phase inverter bridge circuit. A controller is provided to output drive signals to the inverter bridge circuit to control flow of current from to the motor, where each drive signal is activated within each corresponding phase of the motor within a conduction band. The controller is configured to control a length of the conduction band at a variable value within a first torque range below a torque threshold and at a substantially constant value within a second torque range above the torque threshold. The torque threshold is greater than approximately 1 Newton-meters and the motor produces a maximum power output of at least approximately 1250 watts at the torque of approximately 1 Newton-meters.

A method of determining the capability of a nonlinear aircraft power source includes accessing status values representing a current state of an energy storage system in an aircraft, accessing demand values related to expected power demands on the energy storage system, modeling an ongoing status of the energy storage system using the status values and the demand values to predict when one of the status values will reach a threshold value, and providing an output of a capability of the aircraft based on the status value reaching the threshold value.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

A marine AC generator system includes a marine generator driven by an internal combustion engine and configured to generate an AC current and a rectifier configured to rectify the AC current to provide a DC current. At least one battery is configured to receive and be charged by the DC current. A battery powered inverter is configured to be powered by the at least one battery and to generate a variable current output frequency such that an AC electrical power is provided to a load when the marine generator is not running.

The utility model relates to a power supply control device, power supply equipment and a logistics distribution system, and belongs to the technical field of power supply control. The device comprises a main controller; a plurality of slave controllers, wherein the first ends of the slave controllers are electrically connected with the master controller; the power supply devices are electrically connected with the second ends of the corresponding slave controllers; wherein when the master controller outputs a control signal for operating the first power supply device to the first slave controller, the first slave controller responds to the control signal and controls the first power supply device to work; wherein the first slave controller is one of the plurality of slave controllers, the first power supply device is one of the plurality of power supply devices, and the first power supply device corresponds to the first slave controller.

Disclosed is a power-limited network protection system designed to enhance the reliability and stability of networks with multiple remote nodes. This system employs a combination of power supplies and communication transceivers to modulate energy and data transmission, ensuring efficient operation across extensive distances. Each remote node is equipped with an advanced protection device featuring a controllable disconnect switch and monitoring capabilities for current and voltage. This configuration enables independent operation of nodes while preventing cascading failures. By dynamically managing power distribution and implementing fail-safe mechanisms, the system mitigates risks associated with overloads and shorts, ultimately enhancing network resilience. This invention is particularly beneficial in environments prone to electrical disruptions, ensuring continued functionality and minimizing operational downtime.

An electrolyser plant (1A) is described. The electrolyser plant (1A) includes a first DC link (8) with at least one DC link capacitor (C1) and an AC / DC power converter (6). An electrolyser (10) is electrically connected to the first DC link (8) and adapted to receive a load current. During normal operation of the AC power network (2), a controller (12) is adapted to maintain a pre-event DC link voltage and supply a pre-event load current to the electrolyser (10). In response to a detected low voltage event, the controller (12) is adapted to: (a) initially supply the pre-event load current to the electrolyser (10) to maintain normal operation of the electrolyser (10), (b) monitor the DC link voltage, e.g., the voltage in the first DC link (8), and (c) if the monitored DC link voltage falls below a first voltage threshold that is less than the pre-event DC link voltage, reduce the load current supplied to the electrolyser (10), optionally by ramping down the load current at a suitable ramp rate.

The invention provides a direct-current capacitance determination method for a flexible interconnection device of a three-port intensive low-voltage power distribution network, the flexible interconnection device comprises three alternating-current ports and a direct-current port, each alternating-current port is connected with a power grid through an alternating-current feeder line, and the direct-current port comprises a plurality of direct-current capacitors; the method comprises the following steps: respectively determining active power and reactive power of three alternating-current feeder lines, and respectively determining current and modulation voltage of three alternating-current ports according to the active power and the reactive power of the three alternating-current feeder lines; according to the current and the modulation voltage of the three alternating current ports, determining a current instantaneous value of a direct current capacitor without a current direct current component in a fundamental wave period; determining the capacitance value of the direct current capacitor according to the capacitor voltage ripple limit value and the current instantaneous value of the direct current capacitor; the scene of multiple alternating current ports is considered, and the adjusting effect of the power flow is improved.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

The invention discloses a data center novel full direct current power supply system with multi-energy access, a method, electronic equipment and a storage medium, and the system comprises a 2N + 1 power supply scheme, a power supply from two 110kV buses is constructed into two sections of DC750 direct current buses through a unidirectional rectification link, the two sections of direct current buses can be interconnected for standby through a bus tie switch, and the two sections of direct current buses are connected with each other through a bus tie switch. The two sections of direct current buses convert voltage into DC240V through the DC / DC converter to supply power to the data center server, the power supply reliability of the data center is guaranteed, meanwhile, each section of bus is connected with the DC / DC photovoltaic converter, the AC / DC fan converter, the DC / DC energy storage converter and the AC / DC photovoltaic absorption unit through the direct current switch cabinet, the access capability of new energy is improved, and the power supply reliability of the data center is improved. And the power supply of the data center is further ensured by modifying the operation mode under various working conditions such as upper-level commercial power loss and alternating current system failure.

The invention relates to the technical field of alternating-current and direct-current power distribution networks, in particular to an alternating-current and direct-current power distribution network SOP partition interconnection locating and sizing method and a related device, and the method comprises the steps: obtaining GIS multi-source data and power distribution network data of a target region; dividing a power supply area according to the GIS multi-source data and the power distribution network data to obtain a to-be-interconnected partition pair set; generating a high-quality interconnected partition pair set by using the to-be-interconnected partition pair set; constructing a target optimization model by taking the minimum total operation cost as an optimization target and taking a power balance constraint, a node voltage constraint, a branch capacity constraint, an SOP operation constraint, an SOP reactive power constraint and an SOP capacity constraint as constraint conditions; and inputting the high-quality interconnection partition pair set into the target optimization model, cooperatively solving the target optimization model by adopting a double-layer optimization algorithm to obtain the optimal position and the optimal capacity of the SOP, and solving the technical problem that the existing SOP locating and sizing method is difficult to meet the targets of engineering feasibility and optimal operation benefit at the same time.

The invention discloses an AC / DC power distribution network structure selection method comprising the following steps: obtaining typical scene data and candidate grid structure information, the typical scene data comprising scene load, distributed energy node information and a typical daily power curve; establishing a flexibility adjustment capability demand index system, and forming a multi-dimensional demand vector; calculating a flexibility evaluation index of each grid structure in a typical scene, and forming a capability vector; carrying out maximum and minimum normalization processing on the demand vector and the capability vector; and calculating the cosine similarity of the normalized capability vector and the demand vector as a matching degree, and sorting and selecting an optimal grid structure based on the matching degree. According to the method, multiple dimensions such as economical efficiency, new energy consumption rate and electric energy quality can be comprehensively considered, a scientific and visual decision basis is provided for complex AC / DC power distribution network architecture type selection, so that the problem that multiple targets are difficult to consider in a traditional method is solved, and the planning accuracy and efficiency are remarkably improved.

The invention relates to the technical field of power electronics, and discloses a wall-mounted power supply and an intelligent monitoring system thereof, and the system comprises a cabinet body which is internally divided into a top AC input region, a middle region and a bottom battery output region; according to the two-way alternating current input circuit, an alternating current input 1 and an alternating current input 2 are respectively connected to a contactor through a circuit breaker to realize switching of a main power supply and a standby power supply through interlocking logic; the rectification and conversion circuit is used for converting AC input into DC48V through a rectification module to charge the lithium iron phosphate battery pack, and outputting the DC 48V to a DC bus through a boost module; an output power distribution circuit, wherein the DC bus is distributed to a plurality of load output circuits through a fuse; and a monitoring unit interface. Seamless switching of two-way alternating current input is achieved through mechanical and electrical interlocking design, zero-delay switching power supply of a main power supply and a standby power supply is ensured, the state of a battery is monitored in real time, a charging and discharging strategy is dynamically optimized, multiple protection mechanisms are integrated, power supply continuity is remarkably improved, the service life of the battery is prolonged, and stable operation requirements under complex working conditions are met.

The invention discloses a dynamic power management method for an all-electric ship hybrid energy storage system. The method comprises the following steps: S1, establishing a direct-current voltage dynamic model and a ship hybrid energy storage system model based on a ship micro-grid structure of a ship; s2, establishing a multi-working-condition propulsion power model based on the movement mechanism of the ship; s3, establishing a joint SOC-SOP estimation model based on the nonlinear relationship among the state of charge, the battery power characteristics and the ambient temperature; s4, on the basis of the direct-current voltage dynamic model, the ship hybrid energy storage system model and the multi-working-condition propulsion power model, establishing a dynamic power distribution model; and S5, estimating an available power range of the battery through a combined SOC-SOP estimation model, inputting the available power range into the dynamic power distribution model, obtaining a dynamic power distribution strategy, and realizing dynamic power distribution of the ship hybrid energy storage system. According to the method, the dynamic power management of the hybrid energy storage system of the all-electric ship under the uncertain navigation condition is optimized, and the stability and the economical efficiency of a ship power system are improved.

The invention discloses a light-diesel hybrid energy storage system and a control method thereof, and belongs to the field of microgrids. The system comprises a photovoltaic power generation unit, a diesel generator set, a hybrid energy storage unit (a storage battery and a super capacitor), an AC / DC bus, a bidirectional AC / DC converter and a system controller. The controller executes hybrid energy storage frequency division control (without sampling load power and distributing power through bus voltage), V / f control and nine multi-mode energy management strategies, and monitors parameters such as photovoltaic output, load power, energy storage charge state and the like in real time to realize intelligent mode switching. The super capacitor preferentially responds to the pulse load, and the voltage fluctuation ratio is smaller than or equal to 5%; the service life of the storage battery is prolonged in combination with energy storage charge state threshold management; photovoltaic maximum utilization enables the system efficiency to be greater than or equal to 90%, and the diesel oil consumption is obviously reduced. The method is suitable for power grid coverage difficulty scenes such as off-network communication base stations, remote sentries and emergency power supply stations, and has high reliability and maneuverability.

An air conditioner includes an indoor unit and an outdoor unit. The outdoor unit comprises an outdoor unit main control circuit, an outdoor unit communication circuit, a power supply control circuit and an outdoor power supply. The power supply control circuit comprises a first loop, a second loop and a trigger circuit. The first loop is a loop in which a connected power supply line supplies power to the outdoor power supply under the control of a power supply control signal. And the second loop is a loop in which the power supply circuit communicated under the control of a closed control signal supplies power to the outdoor power supply. And the trigger circuit is configured to trigger the first loop to be conducted according to the power supply control signal.

The invention discloses an intelligent switching control method and system for a double-voltage automobile generator, and relates to the technical field of automobile electrical control, and the method comprises the following steps: S001, constructing a frequency response baseline of an automobile power distribution network, and calibrating an inductance parameter of a wiring harness and a capacitance parameter of a filter based on frequency response measurement data; and generating an inherent frequency distribution diagram for reflecting the dynamic electrical characteristics. According to the method, the frequency response base line and the harmonic characteristic spectrum are constructed, so that accurate identification and dynamic prediction of the resonance risk are realized; avoiding the inherent frequency by adopting a multi-level control frequency planning strategy; virtual impedance and an active damping mechanism are introduced to improve the switching stability; and closed-loop optimization control is constructed in combination with residual signal feedback, and continuous convergence of the control performance is realized. According to the overall scheme, the stability, robustness and electromagnetic compatibility of the voltage switching process are improved, and safe operation of the double-voltage architecture under complex working conditions is guaranteed.

A vehicle having a vehicle power system is disclosed. The vehicle may include a battery and the vehicle power system configured to transfer power from the battery to an external accessory connected to the vehicle power system. The vehicle may further include a vehicle sensor configured to detect an actual energy usage of the vehicle power system. The vehicle may further include a processor configured to determine a type of external accessory connected to the vehicle power system and determine an expected energy usage associated with the external accessory based on the type. The processor may determine the actual energy usage of the vehicle power system or the external accessory based on inputs obtained from the vehicle sensor or an external accessory sensor. The processor may compare the actual energy usage with the expected energy usage, and perform an action based on the comparison.

One or more embodiments of the invention provide a power distribution method and device for a multi-machine fuel cell power generation system. The method comprises the following steps: acquiring a corresponding relation between output power and efficiency of each fuel cell in a system; based on the corresponding relation of each fuel cell, constructing a target function by taking maximization of the overall efficiency of the system as a target; and performing iterative optimization on the objective function according to the load power of the system to obtain the optimal output power required to be borne by each fuel cell. According to the method, part of units can be prevented from running in a low-efficiency interval for a long time, the overall efficiency of the system is remarkably improved, dynamic distribution is achieved through iterative optimization, the system automatically adapts to load changes, it is ensured that the system always runs at the optimal efficiency point, and the running cost is effectively reduced.

The present application relates to a kind of light storage fills in and mixes direct current hybrid microgrid network control method, equipment and medium, the method is according to the SOC value of energy storage device and is classified management to energy storage converter.Priority high converter switches to VSG mode, detect whether microgrid voltage and frequency fluctuation exceeds adjustment dead zone.When frequency fluctuation exceeds, active power output is adjusted by VSG mode;When voltage fluctuation exceeds, adjust reactive power output. Energy storage device is switched to VSG mode gradually, when demand cannot be met, photovoltaic equipment and electric vehicle are sequentially put into support grid.Before photovoltaic equipment access, its voltage is consistent with the connected energy storage device, and is converted into VSG mode.If still need further support, then by adjusting charging pile control algorithm, electric vehicle is fed back.Electric vehicle also needs to synchronize voltage and phase before access, to support microgrid.This method significantly improves the voltage and frequency stability of microgrid system.

The invention relates to a control method and device of a hydrogen production system, the hydrogen production system, a medium and a program product, and the method comprises the steps: determining fluctuation power data of a bus of the hydrogen production system; calculating an electric power deviation value between the fluctuation electric power data and target electric power data, wherein the target electric power data is the electric power data on the bus during normal operation of the hydrogen production system; according to the electric power deviation value and the fluctuation electric power data, the output power of a hydrogen production electrolytic cell in the hydrogen production system is controlled, so that the input power of the hydrogen production electrolytic cell is equal to the output power of the hydrogen production electrolytic cell. Therefore, the output power of the hydrogen production electrolytic cell is adjusted according to the electric power deviation value and the fluctuation electric power data, the output power of the hydrogen production electrolytic cell in the hydrogen production system can be rapidly adjusted, then instantaneous unbalanced power caused by faults in the hydrogen production system can be restrained, the hydrogen production system does not need to be shut down for operation, and the energy consumption is reduced. And the stability and safety of continuous operation of the hydrogen production system can be ensured.

The present disclosure is directed to a system that employs fuel cell-based power generation for decentralized data centers that perform large, processing intensive tasks, such as training processes for large artificial intelligence models. The system utilizes various modules, such as energy storage systems, load banks, and other types of loads, to supplement power output by the fuel cells, as well as store any excess power generated by the fuel cell systems. As a result, swings in the power output by the fuel cell systems are minimized and the life of the fuel cell systems may be extended.

An electrical power supply system for an aircraft comprising: a string of a plurality of connected smart battery modules, wherein the string is configured to provide a common output voltage; wherein each of the smart battery modules comprises, terminals for outputting an output voltage to a device external to the smart battery module; a battery assembly configured to supply a DC voltage between two poles; a power converter electrically connected to the terminals and the poles, and a controller operably coupled to the semiconductor stage and configured to control the semiconductor stage for regulating the voltage conversation of the DC voltage into the output voltage a control unit operably coupled to the controller of each smart battery module and configured to set an output voltage and / or current setpoint or limit for each controller individually or configured to set an output voltage and / or current setpoint or limit for all controllers collectively.

The embodiment of the invention relates to the technical field of power systems and automation thereof, in particular to an alternating current and direct current hybrid power flow optimization method based on embedded direct current power flexible adjustment, and the method comprises the steps: building an embedded direct current adjustment model based on an embedded direct current power adjustment principle; constructing an AC / DC hybrid system steady-state power flow optimization model comprising a comprehensive evaluation index, a power system operation constraint and a DC operation constraint; an improved particle swarm algorithm is adopted to solve the steady-state power flow optimization model, the improved particle swarm algorithm updates a population through a chaos quasi-opposition strategy and optimizes an inertia weight and a learning factor, and a power flow optimization result is obtained; comparing different embedded direct-current power regulation modes, and verifying the effectiveness of the alternating-current and direct-current hybrid power flow optimization method; according to the method, accurate power flow optimization of the alternating-current and direct-current hybrid system in a new energy output fluctuation and load change scene is realized, and the economical efficiency, the safety and the stability of system operation are improved.

A dynamic coordination method for flexible direct current (DC) same-frequency control in conjunction with conventional DC single-sided frequency limit control (FLC) and voltage support. This method obtains the flexible DC power adjustment based on the sending-end grid frequency, receiving-end grid frequency, and the system frequency reference value. Subsequently, when the flexible DC power adjustment exceeds a preset limiting range and the system frequency deviation surpasses a preset frequency control dead-band, it outputs the conventional DC power adjustment based on the sending-end grid frequency and the system frequency reference value. Furthermore, based on the conventional DC power adjustment and the original reactive power reference value of the Voltage Source Converter (VSC), reactive power support is provided. This achieves the objectives of fully leveraging the rapid controllability of DC transmission systems, employing flexible DC same-frequency control for flexible DC and single-sided FLC for conventional DC, and swiftly balancing system active power deficiencies.

The invention discloses a data center power distribution optimization method and system, and the method comprises the steps: building a three-dimensional environment-power consumption correlation field model through monitoring a data center calculation node power consumption signal and environment sensing data, and deeply mining an influence rule of environment factors, such as temperature and humidity, on a power consumption demand; probabilistic power consumption parameters are extracted from the association field by applying a probability inference analysis technology, a power consumption event triggering threshold value is established, and a dynamic power consumption management boundary is formed; a quality demand matrix is generated based on service quality demand difference identification, and a hierarchical power consumption parameter system is constructed; adaptive parameters are obtained through load-power consumption correlation analysis, a power consumption redundant component is identified and converted into a power consumption enhancement cache region, and self-adaptive power consumption adjustment is achieved; and finally, constructing a power consumption control matrix, detecting power consumption imbalance nodes, carrying out balanced pairing, and generating an accurate power consumption management instruction, thereby realizing intelligent optimization control of the power consumption of the data center, effectively improving the energy utilization efficiency and guaranteeing the service quality.

The invention discloses an AC / DC power distribution network protection method and device based on a negative sequence voltage ratio. The method comprises the following steps: constructing a fault identification criterion of a two-phase interphase short-circuit fault of the AC / DC power distribution network according to negative sequence voltage fault characteristics of internal and external faults of the AC / DC power distribution network; determining the fault type of the protection line according to the negative sequence current at the head end measuring point of the AC / DC power distribution network protection line and a pre-constructed fault type identification criterion; when the fault type is a three-phase fault, an overcurrent protection method is adopted to protect the protection line; and when the fault type is a two-phase interphase short-circuit fault, determining an internal and external fault identification result of the protection line according to the negative sequence voltage of the measuring points at the two ends of the protection line, the negative sequence comparison voltage and a fault identification criterion.