82 results about "Load bus" patented technology

The invention relates to a power electronics and energy storage technology, and aims to provide a medium-voltage uninterruptible power supply system based on cascade super-capacitance energy storage and a control method. According to the system, a cascade super-capacitance energy storage module with a three-phase structure is connected between an isolation reactor and a load side switch through a filter reactor and is used for stabilizing the voltage of a load bus; according to the invention, operations of adaptive power reference calculation, voltage phase control and voltage amplitude stable control are carried out; according to the method, the over-capacitance wide voltage operation characteristic is fully considered, and the control on the over-capacitance charging and discharging process is adaptively adjusted according to the power grid fault state and the over-capacitance voltage deviation, so that the system can provide the required power support when the fault occurs, stable energy supplementation is performed after recovery, the risks of over-capacitance voltage out-of-limit and the like are favorably avoided, and the system reliability is improved. And the effectiveness of energy management and the stability of the system are improved. And during a power grid fault period, the load voltage is recovered to be close to a rated value in a short time, voltage drop and overshoot are reduced, and the response speed and the voltage supporting capability of the system are enhanced.

This invention provides an energy storage device manager, a system comprising the energy storage device manager, computer-readable media configured for providing the energy storage device manager, and methods of using the energy storage device manager. The energy storage device manager can optionally control charge buses and / or load buses to modulate the state of charge of an energy storage device. The energy storage device manager can optionally be configured with a plurality of modes that target different states of charge. The plurality of modes can optionally comprise a maintain mode which targets a nominal (e.g. 50%) charge state and a high-charge mode that targets a state of charge greater than the maintain mode. The plurality of modes can optionally further include an in-use mode which targets a state of charge greater than the maintain mode, and turns on a load bus that is turned off in the preparation mode. The energy storage device manager can optionally be configured to determine a charge start time to execute the preparation mode. The energy storage device manager can optionally be configured to determine the charge start time based on forecast data (e.g. power prediction forecast determined based on weather forecast).

Disclosed are an Ethernet device, and a bidirectional converter and a control method. The bidirectional converter is arranged in any Ethernet device, including: a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor, a first transformer, and a controller. The controller is configured to: enable the bidirectional converter to be in a forward mode or a flyback mode by controlling respective on / off states of the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor. The bidirectional converter is configured to: in response to being in the forward mode, receive power supplied from a network port and transmit electric energy to a load bus, or in response to being in the flyback mode, receive power supplied from the load bus and transmit electric energy to the network port.

Disclosed are an Ethernet device, and a bidirectional converter and a control method. The bidirectional converter is arranged in any Ethernet device, including: a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor, a first transformer, and a controller. The controller is configured to: enable the bidirectional converter to be in a forward mode or a flyback mode by controlling respective on / off states of the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor. The bidirectional converter is configured to: in response to being in the forward mode, receive power supplied from a network port and transmit electric energy to a load bus, or in response to being in the flyback mode, receive power supplied from the load bus and transmit electric energy to the network port.

The invention discloses a vehicle power redundancy isolator and a control method thereof, and the isolator comprises a main power supply input end which is connected to a vehicle DCDC converter; the standby power supply input end is connected to a vehicle storage battery; the main switch is connected in series between the main power supply input end and the load main line; the load switches are respectively connected in series with the plurality of load branches; the fuse is connected in series between the main switch and the load main circuit; and the controller is used for monitoring voltage values, current values and temperature values of the main switch and the load switch, and controlling the on-off of the main switch or the load switch according to a preset threshold value. According to the scheme, the current, voltage, temperature and other conditions of the main switch and the load switch can be continuously monitored in the vehicle power supply process, real-time power supply protection is conducted on the whole vehicle product according to the detection result, the stability and safety of normal power supply are ensured, the situation that the whole vehicle has great risks due to faults is avoided, and safety accidents are avoided. And the safety of vehicles and personnel is ensured.

A method and device for labeling transient voltage stability samples in a power grid based on semi-supervised learning are provided. The method includes: S1: obtaining a transient voltage time series trajectory V formed for each load bus in the power grid under N transient operating scenarios; S2: preliminarily labeling the stability status of each transient operating scenario with a voltage time series dataset V, and integrating the labeling result Yi into a class label dataset Y; S3: constructing a voltage stability sample set S={(Vi, Yi)|1≤i≤N}, dividing S into sample subsets Su and Sk; S4: labeling samples in Su by using a semi-supervised clustering learning method and a semi-supervised classification learning method to obtain result datasets Yu1 and Yu2 respectively; S5: performing interactive verification on Yu1 and Yu2, and updating Su and Sk; and S6: performing repeated iteration on the S4 and the S5.

The invention provides a solar energy and wind energy centralized power supply system for a communication base station, and relates to the technical field of multi-path energy power supply management. According to a double-bus architecture design, an energy storage bus and a load bus form a physically isolated independent loop, and cooperative control of a wind power switching module and a photoelectric switching module is matched, so that the power supply efficiency is improved; the switching decision-making module compares wind power and photovoltaic output power with load requirements in real time, and by dynamically switching a power supply path energy storage bus or a load bus, maximum local consumption of renewable energy generating capacity can be realized, the utilization rate of commercial power is reduced, and the utilization rate of the commercial power is improved. Electric energy output by the wind power rectification module and the isolation power supply module can be directly injected into a load bus through the wind power switching module and the photoelectric switching module, and the real-time load requirement is met preferentially.

This invention discloses a method for determining the unloaded bus current and a busbar switching control method using the same method. The method for determining the unloaded bus current includes the following steps: A1. Installing current sensors on the porcelain bushings of the circuit breakers on the unloaded busbar side of each phase; A2. Connecting each current sensor to a multi-channel waveform recorder to obtain the maximum capacitive current of each phase unloaded busbar through the multi-channel waveform recorder; A3. Obtaining the maximum capacitive current value of the unloaded busbar. The busbar switching control method includes selecting the threshold value for operating the unloaded busbar with the disconnecting switch according to the rated voltage level of the busbar; and selecting the disconnecting switch or the circuit breaker on the unloaded busbar side to control the switching operation of the corresponding unloaded busbar according to the maximum capacitive current and the threshold value. This invention can flexibly adjust the threshold values ​​for operating the unloaded busbar with the current sensors and disconnecting switches according to the rated voltage level of the busbar, which has good engineering adaptability, is more in line with the actual situation on the engineering site, has good performance, and is easy to promote and use.

Vehicle (112), comprising: a pre-charging circuit designed to selectively couple a resistor (202, 302, 402) via either a first (206, 306, 406) or a second contactor (208, 308, 408) designed to selectively couple terminals of a battery (124) to a load bus (152); and a controller (220, 320, 420) programmed to couple the resistor (202, 302, 402) via the second contactor (208, 308, 408) in response to a pre-charge request in a case where the first contactor (206, 306, 406) is closed when commanded to open and the second contactor (208, 308, 408) is open, in order to pre-charge the load bus (152), characterized by the fact that The controller (220, 320, 420) is further programmed to, in response to the pre-charge request in a case where both the first contactor (206, 306, 406) and the second contactor (208, 308, 408) are open and following an immediately preceding pre-charge request that resulted in the resistor (202, 302, 402) being coupled via the first contactor (206, 306, 406), couple the resistor (202, 302, 402) via the second contactor (208, 308, 408) in order to pre-charge the load bus (152).

The utility model discloses an excitation type dual power supply contact pressing device, which relates to the technical field of dual power supply change-over switches, and comprises a load bus and a power supply module, the upper end of the power supply module is provided with a common source bus, the rear end of the common source bus is provided with a standby power supply bus, and the standby power supply bus is connected with the load bus. A controller is arranged on one side of the power module, a debugging handle is arranged on one side of the controller, a mounting groove is formed in the other side of the controller, a wiring terminal is arranged in the mounting groove, a protection assembly is arranged outside the debugging handle, and the protection assembly comprises a protection sleeve. By means of the scheme, the problems that a debugging handle of an existing dual-power-supply change-over switch lacks protection, is prone to being damaged due to stress during use, installation and maintenance, and is prone to misoperation due to stress, and the protection performance is poor are solved.

The application relates to a hybrid AC / DC microgrid based on a reconfigurable modular multilevel converter and an operation method and a storage medium thereof. The microgrid comprises a modular multilevel converter (MMC), the MMC comprises a plurality of phase legs, each phase leg comprises an upper arm and a lower arm, each arm is connected with a plurality of sub-modules in series, each sub-module comprises a semiconductor switching device, a capacitor energy storage unit and a controllable bypass switch structure; the MMC is connected with an AC bus and a DC bus respectively to realize bidirectional power conversion. The system comprises a plurality of feeder branches which are connected with the bus through power switching devices. Distributed edge controllers are arranged at the sub-modules or feeder interfaces to collect voltage and current parameters and output isolation or bypass signals in an abnormal condition; meanwhile, hierarchical reconfiguration controllers are arranged to perform structure reconfiguration and power path redistribution. The application realizes fault rapid isolation and reconfiguration cooperation through hierarchical control, maintains the voltage stability of the key load bus, and realizes the effect of improving the system reliability and power supply continuity.

A power sub-feed device includes a plurality of bus bars comprising a line bus bar and a load bus bar; a plurality of terminals including a line terminal, a power deviation terminal, a power reception terminal, and a load terminal; a collar assembly attached to the plurality of bus bars; a frame that receives the collar assembly and the plurality of bus bars and covers at least the collar assembly and the plurality of bus bars, where the power sub-feed device is structured to deviate primary power to a secondary device via the power deviation terminal, the secondary device including an automatic transfer switch coupled to a secondary power source, receive power from the secondary device via the power reception terminal, and supply the power from a selected power supply source a load coupled to the main power panel via the load terminal.

The invention provides a satellite MOSFET surge suppression circuit parameter design method, which comprises the steps of adding a capacitor C1 between a grid electrode and a source electrode of an MOSEFT device, and adding a current-limiting resistor R5 at a grid electrode input end of the MOSEFT device; according to the Kirchhoff theorem and the relation formula of the voltage and the current of the capacitor, a voltage expression at the two ends of the capacitor C1 is obtained, and a time mathematical model from the grid voltage to MOSEFT conduction is established; estimating the duration of the surge current according to the maximum value of the surge current, the load bus voltage and the filter capacitance; calculating a divider resistance parameter of the satellite MOSFET gate drive circuit; and calculating the parameter of the capacitor C1. The method has the advantages that the MOSEFT surge suppression circuit is simple and effective in design, and the surge current suppression effect is well achieved.

The application provides a multi-bus three-phase mixed-grid inverter integrated system, comprising a photovoltaic input bus unit, an energy storage bus unit, a first common DC bus unit, a second DC load bus unit, a three-phase mixed-grid inverter unit, a three-phase AC load bus unit, a three-phase power grid bus unit, a bus connection switching unit, a sampling protection unit and a main control unit; the photovoltaic input bus unit is connected to the first common DC bus unit through a photovoltaic DC / DC conversion module; the energy storage bus unit is connected to the first common DC bus unit through a bidirectional DC / DC conversion module; the second DC load bus unit is connected to the first common DC bus unit through a DC connection switch; and the DC side of the three-phase mixed-grid inverter unit is connected to the first common DC bus unit. The application solves the problems of low integration, large bus fluctuation, obvious switching impact and insufficient fault isolation capacity of the existing system.

An externally-controllable electrical power generating system for providing auxiliary or backup power to a load bus or device. The system may be used indoors, and generally includes a power source comprising a first DC output, an electrical storage unit comprising a DC input coupled to the first DC output of the power source, the electrical storage unit further comprising a second DC output. An inverter coupled to the second DC output receives power, the inverter having a first AC output that can be synchronized with an AC load bus or AC grid. The system includes a contactor connected between the first AC output and an AC load bus, and is controllable with an external controller operated by a utility or a managing entity, such that the external controller can enable the controller to connect or disconnect the contactor.

The present invention proposes a full-operating-condition insulation monitoring device applied to a multi-voltage-level on-board microgrid, wherein the full-operating-condition insulation monitoring device comprises: a power battery bus circuit, a DC load bus circuit, an insulation monitor and a bidirectional DC / DC converter, wherein the power battery bus circuit and the DC load bus circuit are connected via the bidirectional DC / DC converter to achieve a bidirectional flow of energy between the power battery and the DC load bus; wherein the insulation monitor comprises a unique insulation monitoring circuit, wherein the insulation monitoring circuit achieves the insulation monitoring requirements of the multi-voltage-level on-board microgrid through the coupling relationship between the insulation resistance of the power battery positive bus and the DC load positive bus, and through conversion. The present invention also designs a corresponding full-operating-condition insulation monitoring method for the insulation monitoring device of the present invention.

A microgrid power system includes a power module configured to generate direct current (DC) power, an inverter module having a DC side and an AC side, and configured to invert DC power received from the power module on the DC side and output alternating current (AC) power on the AC side, a DC bus electrically connecting an output of the power module to an input on the DC side of the inverter module, an AC load bus configured to electrically connect an output on the AC of the inverter module to an AC load, an energy storage device electrically connected to the DC bus, and a kinetic storage device (KSD) device electrically connected to the AC load bus on the AC side of the inverter module.

A PSIS (100) for detecting a type of power source connected to an electric load (108) via a load bus (102), is disclosed. The PSIS 100 includes a sensor unit (208), a filtering unit (210), and a detection unit (214). The filtering unit is adapted to process each set of a current signals and a voltage signals generated by the sensor unit (208) to filter noise therein and generate a plurality of output values corresponding to a filtered set of the current signals and the voltage signals. The detection unit (214) is adapted to process the plurality of output values to identify a pattern using a supervised machine learning model. The detection unit (214) is adapted to compare the identified pattern with a set of previously learned patterns by the supervised machine learning model corresponding to different types of power sources (106) to identify the type of power source.

The invention provides a dual power supply switching control method and a battery management system, and relates to the technical field of battery management. The method is applied to a dual power supply switching control system, the system comprises a main power supply pack, an auxiliary power supply pack, a change-over switch and a communication bus, and the method comprises the following steps: controlling the main power supply pack or the auxiliary power supply pack to access a load bus through a first switching path based on a hard wire signal of the change-over switch; controlling the main power supply pack or the auxiliary power supply pack to access the load bus through a second switching path based on the interaction state information of the main power supply pack and the auxiliary power supply pack through the communication bus; wherein the second switching path is used as a redundant backup path of the first switching path. According to the invention, the dual control architecture composed of the first switching path based on the hard wire signal and the second switching path based on the state information is constructed, and the second path is used as the redundant backup of the first path, so that the single-point fault risk existing in the traditional single control path is fundamentally overcome; and the reliability and the safety of the system are obviously improved.

Disclosed in the present specification is an electric garden work vehicle, which can meet high-power requirements and can also achieve balanced and stable discharge control. The electric garden work vehicle comprises a vehicle frame, a work system connected to the vehicle frame, and a power source system used for supplying power to the work system. The power source system comprises a plurality of battery cells and a power management system, wherein in a discharge stage, the power management system controls at least one of the battery cells, which has a higher evaluation value, in the power source system to discharge first; and when the voltages of the other battery cells exceed a load bus voltage of the work system, the power management system is used for controlling the battery cell to discharge.

An electrical power generating system for providing auxiliary or backup power to a load bus. The system may be used indoors, and generally includes a fuel cell unit comprising a first DC output, an electrical storage unit comprising a DC input coupled to the first DC output of the fuel cell, the electrical storage unit further comprising a second DC output. An inverter coupled to the second DC output receives power, the inverter comprising a first AC output. The system includes a contactor connected between the first AC output and an AC load bus. The AC load bus comprises an AC voltage, and a controller comprising inputs is adapted to sense a phase, a frequency, and a magnitude of the first AC output and the AC voltage and close the contactor when they substantially match.

The invention relates to the technical field of near space aircraft energy systems, and provides a reconfigurable power supply control and power distribution system and method for a near space low-speed aircraft. The system comprises a solar cell array, a lithium battery, an electric load and a reconfigurable power supply control and distribution network. The network connects the solar battery bus, the lithium battery bus and the load bus. The network comprises N bidirectional power converters, N contactors and a reconfiguration controller, the front end of the bidirectional power converter is connected with a solar cell bus or a load bus through a contactor. And the reconfiguration controller is used for controlling the pull-in state of the contactor according to the sampling result of each bus, dynamically configuring the bidirectional power supply converter as a power supply controller or a distributor, and uniformly controlling the pulse width of the bidirectional power supply converter. Flexible configuration of the number of power controllers and distributors in a near space low-speed aircraft is achieved, and the weight of the aircraft is reduced.

The invention discloses a high-proportion photovoltaic access rural power distribution network voltage stability analysis method and system, and the method comprises the following steps: collecting the voltage, current and power of a power generation bus and a load bus, and the node admittance matrix data of a network, and building a network equation through a constant power load model; solving a network equation, and then separating a real part and an imaginary part of the load bus voltage; calculating a partial derivative of the voltage amplitude equation relative to the load bus voltage and the power generation bus voltage, then determining the partial derivative through solving, and obtaining a result of a Jacobian matrix; and deducing a V-Q sensitivity result based on a load bus voltage amplitude equation by using a chain rule. The method does not need to directly depend on a power flow equation, reduces the dependence on a specific balanced operation state, can still obtain a more accurate voltage stability analysis result through the improved method even under the complex condition that the power flow equation is difficult to converge, and provides a reliable basis for subsequent decision making.

The invention discloses a switching station energy saving system and a control method thereof, and belongs to the technical field of power transmission and distribution equipment, the system comprises an STS static change-over switch, a DC / AC power supply module, a DC / DC power supply module, a photovoltaic system, a battery system and a load bus, the STS static change-over switch is connected in series between the output side of a switching station and the load bus, the battery system is connected to one side of the DC / DC power supply module, and the photovoltaic system is connected to the other side of the DC / DC power supply module. The other side of the DC / DC power supply module and the photovoltaic system are connected to the DC side of the DC / AC power supply module, and the AC side of the DC / AC power supply module is connected to a load bus. The method comprises the following steps: if the operation state of a power grid is normal, performing power regulation and control on a DC / AC power supply module and a DC / DC power supply module based on an energy-saving control strategy; and if the operation state of the power grid is abnormal, performing power regulation and control based on an energy-saving control strategy. Energy loss of operation of the switching station can be reduced, and power supply stability of the switching station is improved.

The utility model relates to the technical field of power distribution and power utilization, and provides a user side light storage comprehensive energy grid-connected system, an electric connection system comprises a power grid, a power grid side transformation device, a power distribution switch group, a plurality of load transformers, a load bus group, an energy storage device, a metering device and an anti-reflux device, the power distribution switch group is electrically connected with the electrical connection power grid side transformation device, the plurality of load transformers are electrically connected with the electrical connection power distribution switch group, the load bus group is electrically connected with low-voltage sides of the plurality of load transformers, the metering device is electrically connected with a bus of the load bus group, and the energy storage device is electrically connected with the metering device. And the anti-reflux device is electrically connected with the metering device and the power distribution switch group. According to the utility model, the energy storage device is ensured not to flow back to the power grid in the discharging process, the anti-backflow control at the high voltage part of the power grid side is realized, and the safety and reliability of the system are improved.

A converter system (1) connectable to an electrical power grid (4) via a load bus (5), and to an electric metal heating furnace system (7). The converter system comprises a first power converter (2), and a second power converter (3). Each one of the power converters comprises AC and DC terminals (12, 15, 13, 16). The first power converter is connectable to the load bus, and, at its DC terminals, to the second power converter and to an energy storage system. The second power converter is connectable, at its DC terminals, to the first power converter and to the energy storage system, and, at its AC terminals, to the electrical metal heating furnace system and to the load bus. The converter system further has a control unit to set the converter system in any of several operational modes. One operational mode is a STATCOM mode where at least one of the power converters is connected to the load bus and acts as a STATCOM for the electric metal heating furnace system. The electric metal heating furnace system is connected to the load bus. Another operational mode is a power supply mode where the first power converter is connected to the load bus, the second power converter is connected to the first converter and to the electric metal heating furnace system, and the electric metal heating furnace system is disconnected from the load bus.

The invention discloses a power flow optimization method and device based on deep learning and a quantum genetic algorithm, terminal equipment and a storage medium, and belongs to the technical field of power flow optimization of a power system. Constructing a power flow model and constraint conditions by taking minimization of fuel cost, power loss and voltage deviation of a load bus as targets, and generating an initial quantum population which meets the constraint conditions and is provided with a plurality of quantum bits; wherein each quantum bit represents the output active power variation of one group of generators; and then, according to the initial power flow data and the initial quantum population, power flow solving operation is repeatedly executed, the optimal output active power variation of each generator is obtained, and output adjustment is carried out on each generator according to the optimal output active power variation. By implementing the method, the problem that the power flow optimization result cannot meet the overall optimization requirement when a traditional optimization method is used in the prior art can be solved.

The present invention provides a communication base station solar and wind energy centralized power supply system, which relates to the technical field of multi-channel energy power supply management. According to the present invention, a dual-busbar architecture is designed to form a physically isolated independent loop between the energy storage bus and the load bus. In conjunction with the coordinated control of the wind power switching module and the photovoltaic switching module, the switching decision module compares the wind power and photovoltaic output power with the load demand in real time. By dynamically switching the power supply path energy storage bus or load bus, the maximum on-site consumption of renewable energy power generation can be achieved, and the utilization rate of mains electricity can be reduced. The electric energy output by the wind power rectifier module and the isolated power supply module can be directly injected into the load bus through the wind power switching module and the photovoltaic switching module, so as to give priority to meeting the real-time load demand.

A converter system (1) connectable to an electrical power grid (4) via a load bus (5), and to an electric metal heating furnace system (7). The converter system comprises a first power converter (2), and a second power converter (3). Each one of the power converters comprises AC and DC terminals (12, 15, 13, 16). The first power converter is connectable to the load bus, and, at its DC terminals, to the second power converter and to an energy storage system. The second power converter is connectable, at its DC terminals, to the first power converter and to the energy storage system, and, at its AC terminals, to the electrical metal heating furnace system and to the load bus. The converter system further has a control unit to set the converter system in any of several operational modes. One operational mode is a STATCOM mode where at least one of the power converters is connected to the load bus and acts as a STATCOM for the electric metal heating furnace system. The electric metal heating furnace system is connected to the load bus. Another operational mode is a power supply mode where the first power converter is connected to the load bus, the second power converter is connected to the first converter and to the electric metal heating furnace system, and the electric metal heating furnace system is disconnected from the load bus.

The invention provides a three-phase electricity safety electricity utilization control method and device and an air conditioner, and is applied to the field of air conditioner control. The method comprises the steps that a set phase voltage threshold value of the air conditioner and the current operation power of the air conditioner are obtained; calculating a target voltage difference value between the no-load bus voltage and the maximum bus voltage based on the phase voltage threshold value, the current operation power and a target curve formula, and calculating the no-load bus voltage of the air conditioner based on the phase voltage threshold value; and calculating the maximum bus voltage according to the target voltage difference value and the no-load bus voltage, and executing an overvoltage protection strategy under the condition that the rectification input voltage is greater than the maximum bus voltage. According to the three-phase electricity safety electricity utilization control method and device and the air conditioner, the value of the voltage actually input to the rectification side is accurately calculated, so that the air conditioner can accurately judge whether the current input voltage exceeds the safety electricity utilization range or not, and corresponding overvoltage protection measures are taken in time.