56 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.

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.

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.

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.

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.

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.

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.

The invention discloses an electric garden operation vehicle and a discharge control method thereof, which can realize balanced and stable discharge control while meeting the high-power requirement. The electric garden operation vehicle comprises a vehicle frame, a working system connected to the vehicle frame and a power supply system used for supplying power to the working system. The power supply system comprises a plurality of battery units, the plurality of battery units select at least one of a first specification battery pack and a second specification battery pack, the capacity of the first specification battery pack is greater than that of the second specification battery pack, and the second specification battery pack is configured to provide power for the handheld garden tool; the power supply management system is used for controlling at least one battery unit with a higher evaluation value in the power supply system to discharge at first in a discharge stage; and when the voltage of other battery units exceeds the load bus voltage of the working system, the power management system is used for controlling the battery units to discharge.

A battery system includes a load bus for connection to a DC link, a single pre-charge circuit connected to the load bus, multiple battery packs, and a control circuit. Each battery pack contains multiple battery strings, each consisting of series-connected battery cells, a positive contactor for connecting the battery string to the load bus, and a pre-charge contactor for connecting the battery string to the pre-charge circuit. The control circuit selects a battery string to pre-charge the DC link, closes the pre-charge contactor of that battery string to connect it to the pre-charge circuit, opens the pre-charge contactor of the selected battery string to disconnect it from the pre-charge circuit, and closes the positive contactor of the selected battery string to connect it to the load bus when the DC link is pre-charged.

A battery system includes: a load bus for connection to a DC link; a single pre-charge circuit connected to the load bus; a plurality of battery packs; and a control circuit. Each battery pack includes a plurality of battery strings, the plurality of battery strings including: battery cells connected in series; a positive contactor for connecting the battery string to a load bus; and a pre-charge contactor for connecting the battery string to the pre-charge circuit. The control circuit selects the battery string to pre-charge the DC link, closes the pre-charge contactor of the battery string to connect the selected battery string to the pre-charge circuit, and opens the pre-charge contactor of the selected battery string to disconnect the battery string from the pre-charge circuit when the DC link is pre-charged, and closing the positive contactor of the selected battery string to connect the battery string to the load bus.

The application discloses an environment self-adaptive power consumption behavior enhancement intelligent sensing method and device based on multi-task learning, collects load bus current data, performs short-time Fourier transform on the current data, takes time-frequency information under all frequency bands of the obtained time-frequency distribution as extracted features, inputs the features into a multi-task learning improved time convolution network, so as to simultaneously obtain output results of multiple tasks of power consumption behavior category identification, power consumption behavior type subdivision and power consumption behavior prediction, controls corresponding load switching according to the power consumption behavior prediction result, and compares and verifies the newly obtained power consumption behavior type subdivision result with the previous power consumption behavior prediction result. The application can improve intelligent power consumption experience in a multi-load power consumption scene and avoid safety hazards caused by equipment operation.

The application discloses a super capacitor energy storage system and a control method for a nuclear fusion device, relates to the technical field of high-power pulse power supply, and adopts a distributed architecture and contains N sets of subsystems. Each N / 2 set of subsystems shares one power supply bus, and the two power supply buses are connected through a tie-in switch. The subsystems are formed by cascading super capacitor energy storage modules, and the internal ABC three-phase circuit adopts star / angle topology connection. Each N / 2 set of subsystems shares one load bus, the load bus is connected with independent loads and common loads (both are nuclear fusion device coil loads), and is connected with the power supply bus through a discharge switch. The system supports three operation modes of grid-connected charging, off-grid discharging and energy feedback, can realize efficient storage, release and recovery of energy, and meets the dynamic energy demand of the nuclear fusion device.

The invention relates to an energy-saving, environment-friendly and carbon emission optimization method and system under high photovoltaic permeability, and belongs to the technical field of new energy grid connection, and the method comprises the following steps: enabling a photovoltaic unit to be directly connected to a load bus through an inverter in a high photovoltaic permeability power grid, and forming an interconnection channel which can be dynamically opened or closed; constructing an energy-saving and environment-friendly objective function by taking power generation cost minimization and carbon emission reduction maximization as optimization objectives; photovoltaic power generation power and load demand power are monitored in real time, and an interconnection channel is opened and closed; the load bus voltage of the photovoltaic access point is monitored in real time, and voltage fluctuation is controlled through reactive power compensation; and solving the energy-saving and environment-friendly objective function by adopting an interior point method in combination with a KKT condition, and outputting a scheduling instruction which meets the security constraint and dynamically coordinates the generation power of the traditional energy unit and the photovoltaic unit.

The invention discloses a power grid inertia center frequency calculation method and a related device, and the method comprises the steps: calculating the inertia center frequency of a generator set and the inertia center frequency of power electronic equipment based on a preset inertia constant and a preset capacity, and obtaining the center frequency of the generator set and the center frequency of the equipment; performing weighted calculation on the inertia center frequency of the load bus according to the fitting inertia constant and the load size to obtain the load center frequency; and performing weighted average calculation on the unit center frequency, the equipment center frequency and the load center frequency to obtain a power grid inertia center frequency. Meanwhile, influences of generator set capacity, load characteristics and power electronic equipment inertia factors are considered, the core inertia source of the novel power system is covered, the requirements of the novel power system can be met, and the low inertia risk after large-scale access of the power electronic equipment is effectively dealt with. Therefore, the technical problem that the calculation result lacks accuracy due to the fact that the influence of each device of the system on the inertia center frequency is not considered in the prior art can be solved.

The application provides a distributed economic dispatch optimization method based on constraint projection reinforcement learning, comprising the following steps: constructing a distributed economic dispatch mathematical model based on operation constraints, combining a power generation cost function and feasible power output of a power generation unit; implementing an average consistency method on each power generator in a regional communication network to obtain global information in a micro-grid in a distributed manner; converting the distributed economic dispatch mathematical model into a distributed economic dispatch optimization problem based on constraint projection by using an Actor-Critic algorithm; combining a Lagrange multiplier method and a penalty function method to obtain an augmented Lagrange dual form of the optimization problem, and obtaining optimal power output of the distributed economic dispatch optimization problem based on a KKT condition. The application can effectively coordinate power output of the power generators in the micro-grid without paying attention to construction of the cost function, and can complete a distributed dispatch task through feedback interaction with an unknown load bus.

The application relates to the technical field of charging stations, in particular to a power load distribution system based on direct-current stacked storage, which comprises: a direct-current stacked storage energy battery comprising a plurality of battery modules; a plurality of switch devices are arranged, and each battery module is connected to a load bus through a corresponding switch device; a control device acquires the demand of the power load, controls the corresponding switch device to be closed according to the demand of the power load, so that the required number of battery modules are connected to the load bus; the control device is configured to: in response to the demand of the power load, control the switch device to connect at least one capacitor to the load bus and connect at least one battery module to the load bus, and gradually control the switch device according to the change of the charging current, and replace the capacitor connected to the load bus with the battery module. The technical scheme provided by the application significantly improves the dynamic response capability and operation stability of the system, and further provides higher charging current in practice.

The utility model provides an LED driver simulation aging device adopting a diode simulation load. The LED driver simulation aging device comprises an LED driver, a load bus, a program control multipath load switch, a simulation load module, a sensor assembly and an MCU microcomputer control processor. The LED driver serves as a power supply device and is provided with an output end, and the output end of the LED driver is connected with the load bus; the load bus is connected with the output end of the LED driver and is connected with the simulation load module; the simulation load module adopts crystal diodes connected in series as a simulation load to form a diode simulation aging load module, and the diode simulation aging load module is connected with the load bus; the program-controlled multi-path load switch is arranged on a load bus, is connected with the MCU microcomputer control processor through a communication bus, and is used for switching different simulation load channels; the sensor assembly is located in the simulation load module. According to the utility model, the electrical characteristics of a real LED can be simulated more accurately, so that the accuracy and reliability of the aging test of the LED driving product are improved.