8 results about "Load bus" patented technology

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.

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.

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.

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 working condition self-adaptive power supply method for a dawn-dusk orbit computing power satellite, which is applied to mutually independent load and platform power supply buses, and a cross-chain bus connection unit is connected between the two buses, which unidirectionally supplies the platform bus with the electric energy of the load bus when controlled; the method comprises the following steps: collecting satellite on-orbit operation parameters in real time; identifying illumination period, eclipse period, transition period and fuzzy shadow period; sending cooperative control instructions to each power supply unit and the cross-chain bus connection unit according to the current working condition and the collected parameters, and adjusting the power supply power and voltage of the two buses to adapt to the power consumption demand of the computing power load, and realizing the following: the illumination period is dynamically adapted to the regular power and the instantaneous peak power of the computing power load, the eclipse period provides low-power stable voltage standby power supply, the transition period provides stable regular power supply, and the fuzzy shadow period provides regular power supply and prohibits peak output. Through the four types of working condition self-adaptive power supply strategies, the computing power load power supply stability and the whole-satellite energy utilization efficiency are improved.

The application relates to the technical field of two-wheel vehicle BMS, in particular to a pre-discharge control circuit applied to a battery management system, which comprises a pre-discharge control input unit, an input end of which is connected with a microcontroller; a level conversion and drive control unit, an input end of which is connected with the microcontroller; a pre-discharge power switch unit, which is connected in series between a power battery and a load bus, and whose control end is connected with an output end of the level conversion and drive control unit; an anti-backflow and energy clamping structure, which is arranged in a pre-discharge path; a current detection protection unit, which is connected in series with the pre-discharge circuit; and a voltage detection feedback unit, an input end of which is connected with a bus voltage, and an output end of which is connected with a voltage detection end of the microcontroller, and which is used for judging a pre-discharge completion state. The pre-discharge control circuit applied to the battery management system and the control method thereof adopt a multi-stage level conversion structure, improve driving reliability, and avoid damage of MOS linear area through a gate protection network.

The utility model requests protecting a kind of battery control circuit of online step-up discharging of preventing load transfer, it includes battery, boost module, pre-charging module, contactor K1 and contactor K2, nuclear capacity device is connected with the signal end of boost module, pre-charging module, contactor K1 and contactor K2 respectively;The positive pole and negative pole of battery are parallelly connected to external charging bus and load bus respectively, the positive pole of external power supply is connected to the output end of boost module and the positive pole of battery respectively, boost module side boost end and battery pack positive pole are connected, the other side boost end is connected by contactor K1 and battery pack negative pole, the negative pole of external power supply and the negative pole of battery are connected.The battery control circuit of the application is nuclear capacity to battery by DC / DC boost mode, when battery nuclear capacity, electric energy supplies load effectively, and the discharging process does not heat.