39 results about "Load bus" patented technology

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.

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 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.

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 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.

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 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.

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.

The embodiment of the application discloses a rice quantity judgment method, which is applied to a rice polishing machine. The method comprises the following steps: obtaining a no-load bus current value of a motor of the rice polishing machine, the no-load bus current value being a bus current value when the motor is in no-load operation; collecting a target bus current value of the motor, the target bus current value being a bus current value when the rice polishing machine is loaded with rice; and calculating a rice quantity in the rice polishing machine according to a difference between the no-load bus current value and the target bus current value based on a first preset relationship, the first preset relationship being a mathematical relationship between the difference between the no-load bus current value and the target bus current value and the rice quantity.

The invention provides an electric hydrogen production load participation power grid interaction control method and device, and relates to the technical field of power system operation and control. The method comprises the following steps: based on load voltage-power coupling characteristics, establishing a CVR coefficient model of an electrical hydrogen production load, and identifying a CVR coefficient of the electrical hydrogen production load; introducing an electrical hydrogen production load feedback link on the basis of the classical frequency response model, establishing an electrical hydrogen production load frequency response model, and solving a negative feedback coefficient of the electrical hydrogen production load participating in system frequency adjustment on the basis of the electrical hydrogen production load frequency response model; and under the condition of system frequency disturbance, obtaining an amplification coefficient of electric hydrogen production load bus voltage frequency feedback control according to the CVR coefficient and the negative feedback coefficient, establishing a feedback adjustment coefficient controller based on the amplification coefficient, and realizing participation of the electric hydrogen production load in power grid frequency modulation through the feedback adjustment coefficient controller. When power disturbance occurs in the system, the electric hydrogen production load participates in power grid frequency modulation, and the stability of the system frequency is ensured.

The utility model discloses a grid-connected and off-grid switching circuit, a grid-connected and off-grid switching device and an inverter, and belongs to the technical field of power electronics. The grid-connected and off-grid switching circuit is provided with an inverter node, a power grid node and a load node, the grid-connected and off-grid switching circuit comprises a first load branch line, a second load branch line, a load bus and a grid-connected bus, the first side of the grid-connected bus is connected with the inverter node, and the second side of the grid-connected bus is connected with the power grid node; the first side of the first load branch line is connected with the first side of the grid-connected bus, the first side of the second load branch line is connected with the second side of the grid-connected bus, the second side of the first load branch line and the second side of the second load branch line are both connected with the first side of the load bus, and the second side of the load bus is connected with the load node; and controllable switches are arranged on the first load branch line, the second load branch line and the grid-connected bus. The configuration of the load power supply path is more flexible, and when the inversion node and the power grid node need to be isolated, the power supply can be conveniently accessed from the corresponding node, thereby improving the isolation effect.

The invention relates to the technical field of charging stations, in particular to a power load distribution system based on direct-current stacked storage, and the system comprises a direct-current stacked storage energy storage battery which comprises a plurality of battery modules; a plurality of switch devices, each battery module being connected to the load bus through the corresponding switch device; the control device is used for acquiring the demand of the power load and controlling the corresponding switch device to be closed according to the demand of the power load so as to enable the battery modules with the required number to be connected to the load bus; the control device is configured to, in response to an electrical load demand, control the switching device to access the at least one capacitor to the load bus, access the at least one battery module to the load bus, gradually control the switching device according to a change in charging current, and replace the capacitor accessed to the load bus with the battery module. According to the technical scheme provided by the invention, the dynamic response capability and the operation stability of the system are remarkably improved, so that higher charging current can be provided in practice.

The utility model provides a kind of modular electronic equipment power supply management system, comprising: main controller, at least two pluggable power modules, centralized protection module and dynamic balancing module;The main controller is respectively electrically connected with the identity recognition unit of each pluggable power module by SPI bus, and the output end of each pluggable power module is connected to the input end of centralized protection module after being converged by copper bar;The centralized protection module includes self-restoring fuse in series in the copper bar and overvoltage detection circuit connected with the IO port of main controller, and its output end is connected to load bus;The dynamic balancing module is connected between load bus and ground in parallel, and its control end is connected to the output pin of main controller through PWM signal line;The power supply pin of main controller is respectively electrically connected with the 3.3V output end of pluggable power module, the auxiliary power supply interface of centralized protection module, and the utility model can solve the deficiency of existing fixed architecture in adaptability and maintainability.

The invention discloses an extra-high voltage GIS full-working-condition real-model test platform, which relates to the field of high-voltage circuit breakers and is characterized in that according to working condition requirements of the test platform, a platform loop is built by configuring typical units such as a circuit breaker, an isolating switch and a bus, multiple types of test power supplies and corresponding protection devices; the acoustic-optical-electric combined detection system is arranged on loop equipment, so that typical hot-line operation working conditions such as GIS under-voltage through-flow, switching of a no-load bus by a circuit breaker and an isolating switch and the like under actual operation conditions can be simulated; gIS real-type tests such as a test of influence of metal particles on GIS insulation, a test of opening and closing a no-load bus of a circuit breaker / an isolating switch, a power frequency / direct current superposition impulse voltage test and the like can be carried out; and the GIS insulation fault in the test process can be detected by using an acoustic-optical-electric combined detection system integrating multiple detection modes.

The invention provides a voltage threshold adaptive control method for an energy storage converter, and the method comprises the steps: collecting the terminal voltage USC of a super capacitor and the DC bus voltage Udc of a traction system in real time, and obtaining the SOC of the super capacitor and the bus voltage Udc0 in a no-load state; fuzzy definition and fuzzy division are carried out on the super capacitor state of charge SOC and the traction bus voltage, and a membership function is set; dividing a fuzzy domain according to the threshold voltage output by the fuzzy controller, and constructing a rule base of the fuzzy controller; fuzzy reasoning is carried out by using a maximum-minimum reasoning method, and defuzzification is carried out by using a centroid method to obtain a threshold voltage value USCDischarge; performing control logic setting based on the threshold voltage, and dynamically adjusting the threshold value of the discharge voltage of the super capacitor; a polling frequency is set, the steps are polled, and the threshold value of the discharge voltage of the stage capacitor is updated in real time; according to the invention, precise control of the voltage of the super capacitor is realized, the voltage stability is ensured, and the system efficiency and reliability are improved.

The application provides a power transmission and distribution network coordinated emergency voltage control method and system, comprising: obtaining wide-area measurement data, calculating generator reactive power margin, when the generator reactive power margin is lower than a set value, including an active power distribution network into power transmission network level control, and calculating reactive power demand of the power transmission network on each active power distribution network; judging whether the reactive power margin of the active power distribution network meets the reactive power demand; if yes, taking the difference between the total photovoltaic output of the power distribution network and the reactive power output support of the active power distribution network and the reactive power demand of the power transmission network as the target, calculating the reactive power output support of the active power distribution network; otherwise, the reactive power output support of the active power distribution network is the reactive power margin of the active power distribution network; applying the reactive power output support of the active power distribution network to the power transmission network, judging whether the load bus voltage meets the preset requirement, if yes, stopping the emergency voltage control; otherwise, returning to calculate the generator reactive power margin until the preset requirement is met. The voltage stability of the power transmission and distribution network is improved.

The invention discloses a reactive power regulation service dynamic excitation method based on a Stackelberg game, and the method comprises the steps: constructing an electrical coupling strength matrix between each power generation main body and a load bus based on a power grid node admittance matrix, and dividing a whole power grid into a plurality of local markets according to the electrical coupling strength matrix; calculating a correlation factor of each power generation main body in each local reactive power market; constructing a two-dimensional cost model about operation cost and opportunity cost based on the correlation factors, and designing a linear pricing function; according to the two-dimensional cost model and the linear pricing function, constructing a total revenue function of the subject participating in the market transaction; and based on the total revenue function and preset physical constraints and market constraints, calculating the total revenue of the subject participating in the market transaction.

The invention discloses an alternating current power supply control method, a power supply system, a rolling stock and a medium, and relates to the technical field of rail transit. According to the method, a plurality of power supplies are used for synchronously supplying power to a load, namely, high-power stable power output can be realized by using a relatively low power supply, so that the power supply capacity of the power supplies is improved; the power supply does not need to be redesigned, the fault rate of the power supply is reduced, the power supply is controlled to be connected into the load bus through the switching element, namely, the output power of the power supply is controllable, and resource waste caused by redesigning and manufacturing high-power output is avoided; secondly, a plurality of power supplies are connected to the load bus one by one, and after a new power supply is started, the phase matching parameter of the newly started power supply is controlled to be consistent with the reference phase matching parameter of the power supply connected to the load bus, and then the switch element is closed, so that interference between output voltages of the power supplies is avoided; and the output of the plurality of power supplies can meet the load requirement.