3104results about "Dc network circuit arrangements" patented technology

The invention relates to the technical field of charging piles, and provides a DC charging pile voltage stability optimization method and device and a storage medium, and the method comprises the steps: obtaining voltage sequence data of a DC output end of a charging pile, carrying out the segmentation statistics of the voltage sequence data, and obtaining an optimization adjustment matrix and a voltage compensation factor matrix; and performing dynamic adjustment on a preset direct current output control strategy of the charging pile based on the optimization adjustment matrix to obtain an adjusted control strategy parameter, performing compensation calculation on the adjusted control strategy parameter by using the voltage compensation factor matrix to obtain an optimization control instruction, and generating a dynamic voltage stabilization control signal according to the optimization control instruction. An output control strategy is dynamically adjusted by optimizing an adjustment matrix and a voltage compensation factor matrix, an efficient dynamic voltage stabilization control signal is generated, and the problems of response lag and insufficient prediction precision existing in the prior art when a complex voltage fluctuation mode is processed and a future voltage change trend is predicted are solved.

To establish wire protection from an upstream side to a downstream side without requiring re-design of a wire protection function when adding or changing an on-vehicle device.SOLUTION: A first power supply distribution device 11 comprises a cutoff section 111 and a control section 113 which controls the cutoff section 111 on the basis of first cutoff characteristics. Second and third power supply distribution devices 12 and 13 comprise cutoff sections 121 and 131 and control sections 123 and 133 which control the cutoff sections 121 and 131 on the basis of second cutoff characteristics. The first cutoff characteristics and the second cutoff characteristics are initially set in such a manner that a cutoff time of the cutoff section 111 becomes longer than cutoff times of the cutoff sections 121 and 131. In a case where cutoff characteristics of the cutoff sections 121 and 131 are changed by changing or adding on-vehicle loads 2B and 2C and the cutoff time of the cutoff section 111 becomes shorter than the cutoff times of the cutoff sections 121 and 131, the control section 113 changes the first cutoff characteristics in such a manner that the cutoff time of the cutoff section 111 becomes longer than the cutoff times of the cutoff sections 121 and 131.SELECTED DRAWING: Figure 1

A power source assembly is provided having a fuel cell module configured to provide a first direct current power output; a battery module configured to provide a second direct current power output; a direct current electric bus configured to provide a net direct current power output to a load; a DC / DC converter in electrical connection with the direct current electric bus, the DC / DC converter configured to receive the first direct current power output from the fuel cell module or the second direct current power output from the battery module; and a controller operably coupled to the DC / DC converter and configured to receive data indicative of the first direct current power output, the controller configured to control the DC / DC converter based on the data indicative of the first direct current power output to maintain a slew rate from the fuel cell module within a slew rate range.

A power module includes a power input end, a first DC / DC power converter, a second DC / DC power converter, a switching unit, and at least two load output ends. A first input end of the first DC / DC power converter and a second input end of the second DC / DC power converter are coupled to a first power supply by using the power input end of the power module, a first output end of the first DC / DC power converter and a second output end of the second DC / DC power converter are coupled to one end of the switching unit, and the other end of the switching unit is coupled to load by using any one of the at least two load output ends of the power module.

A simulation system of a railway system for a Medium-Voltage Direct Current (MVDC) distribution network includes: a computing device which stores a simulation program including a converter station model configured to simulate a converter station included in the MVDC distribution network and a train operation model configured to simulate an operation state of a train that is supplied with power from the converter station and runs; a converter controller which controls a DC / DC converter included in the converter station model; and a Hardware In the Loop Simulation (HILS) device which performs a simulation based on the converter station model, the train operation model, and the converter controller. Herein, the converter station model and the train operation model are executed in software by the HILS device, and the converter controller is connected to the HILS device and driven to control the converter station model.

The present invention relates to the technical field of energy storage. Disclosed is a wired parallel operation method applied to grid connection and grid disconnection of an energy storage system. The energy storage system comprises a plurality of inverters, a communication module, an electric meter and a load. The inverters are connected in parallel, each inverter being connected to the communication module, and each inverter being connected to a battery; the electric meter is connected to one of the inverters, and the electric meter is connected to the load. The method comprises: each inverter determines whether the inverter itself is a master inverter or a slave inverter according to the communication state with the electric meter; the master inverter sends a synchronization signal to each slave inverter, such that the switching frequency and the working mode of each slave inverter are synchronized with that of the master inverter; the master inverter communicates with the electric meter to acquire load power consumption information and outputs same to the communication module; and the communication module communicates with the master inverter and the slave inverters to acquire battery information, and adjusts the battery charge and discharge power according to the load power consumption information and the battery information. The present application ensures a reasonable distribution of power among inverters, thus avoiding the phenomenon of high-frequency circulating currents.

A battery assembly configured to be operable during charging or discharging to distribute a common current delivered to or from a common bus and a use of at least one analog battery module. Also disclosed is an analog battery module for distributing current between a plurality of battery strings. Each analog battery module is connectable in series with a respective battery string. The distribution of the current between the battery strings is at least partially given by the respective voltages of the analog battery modules.

A ground fault detection apparatus is used for an on-board system. The on-board system includes a power source unit, a power storage unit, a conductive path, and a disconnection unit. The conductive path includes a first conductive path, a second conductive path, and a third conductive path. The disconnection unit includes a first disconnection unit and a second disconnection unit. A second load is connected to one path out of the second conductive path and the third conductive path, and a third load is connected to the other path. The ground fault detection apparatus includes a detection unit (a current detection unit and a control circuit) configured to detect a ground fault on at least one of the second conductive path and the third conductive path.

In a method for operating an electric vehicle, including a first energy storage device (e.g., a rechargeable battery storage device), a second energy storage device (e.g., a double-layer capacitor device), an energy supply unit which provides energy, for charging the first and / or second energy storage device, and a first electrical consumer connected to the second energy storage device via an intermediate circuit, the first energy storage device is connected to the energy supply unit via a bidirectional converter unit, the second energy storage device is connected to the energy supply unit, a first power flows from the first energy storage device to the second energy storage device if an intermediate circuit voltage falls below a definable voltage, and a second power flow from the second to the first energy storage device is prevented.

Module-based energy systems are provided having multiple converter-source modules. The converter-source modules can each include an energy source and a converter. The systems can further include control circuitry for the modules. The modules can be arranged in various ways to provide single phase AC, multi-phase AC, and / or DC outputs. Each module can be independently monitored and controlled.

The present application provides a pre-charging circuit for a bus capacitor of a high-voltage line and a pre-charging system. The circuit comprises: a forward-conversion circuit comprising a switching device, an isolation transformer, and a sampling resistor, which are electrically connected in series, wherein the isolation transformer serves to generate a charging current, wherein the switching device serves to control the magnitude of the charging current, and wherein the sampling resistor serves to electrically connect to the bus capacitor; a gain and comparator module, which is used to detect a charging current flowing through the sampling resistor and to generate a feedback signal corresponding to the magnitude of the charging current;A drive control module, electrically connected to both the forward conversion circuit and the gain and comparator module, wherein the drive control module is used to control the switching device in the forward conversion circuit such that the switching device is switched according to the feedback signal sent by the gain and comparator module, thus controlling the charging current of the bus capacitor within a preset current range. This circuit utilizes low-voltage forward isolation to precharge the bus capacitor on a high-voltage side, collects current feedback resistors to control the current output, and achieves a controllable bus capacitor charging current with high safety and efficiency.

A vehicle battery jump starter that is powered by a removable and rechargeable battery pack, such as a battery pack used with various hand-held power tools. The battery pack removably connects to a vehicle battery jump starter and can be selectively used to charge a power boost module within the vehicle battery jump starter. The power boost module includes, for example, a plurality of supercapacitors or lithium polymer battery cells. The power boost module in combination with the battery pack 100 are used to jump start a vehicle battery. The vehicle battery jump starter includes a charge control circuit configured to control charging of the power boost module based upon battery information obtained from the battery pack.

The invention discloses a flexible DC power distribution network fault prediction method and device, equipment and a medium. The method comprises the steps of collecting power grid operation data of a flexible DC power distribution network; performing feature extraction on the power grid operation data to obtain feature variables; a preset optimization target model is adopted to optimize the preset initial weight vector, and feature weight distribution is adjusted; and calculating a fault probability according to the feature weight distribution, the feature vector and a pre-constructed fault probability prediction model. According to the scheme, the adaptability and precision of fault prediction can be improved.

A microgrid system includes an electrical bus including at least one electrical load; at least one non-energy storage system asset configured to supply electrical power to the electrical bus; an energy storage system group including: two or more energy storage system assets configured to supply electrical power to the electrical bus, and a system controller operatively coupled to each of the assets on the electrical bus. The system controller is configured to: determine characteristic energy set points and power limits for each of the assets; determine that at least two or more assets have a same priority for power distribution; determine the characteristic power set points for the non-energy storage assets, dispatch the energy storage system assets having the same priority by treating a dispatch for the energy storage system assets as a combined asset.

An electrical power apparatus for coupling between an electrical power supply and one or more electrical power loads includes: a plurality of dynamically dispatchable electrical energy storage components providing at least one of dynamically dispatchable energy storage thereto and energy retrieval therefrom; and a controller to dynamically control the operation of the one or more dynamically dispatchable energy storage components in order to dynamically match the electrical power supply to the one or more loads by dynamically storing energy in one or more of the dynamically dispatchable electrical energy storage components when the available electric power exceeds that required by the one or more loads, and / or dynamically supplying electrical energy from one or more of the dynamically dispatchable electrical energy storage components when the available electric power is less than that required by the one or more loads.

The invention belongs to the technical field of power distribution, and discloses a direct current transformer soft switch and a control method.The direct current transformer soft switch comprises a medium-voltage direct current bus and low-voltage direct current buses, the medium-voltage direct current bus is electrically connected with a modular multi-level multi-port direct current converter, and the modular multi-level multi-port direct current converter is electrically connected with a plurality of low-voltage direct current converters; the plurality of low-voltage direct-current converters are electrically connected with a low-voltage direct-current bus and are used for realizing bidirectional power transmission from medium-voltage direct current to low-voltage direct current; according to the method, the medium-voltage side inductance value is reduced, the medium-voltage side current ripple is enabled to pass zero, the M3DC operates in an approximate critical conduction mode, a constant valley current control strategy is adopted, the minimum value of the medium-voltage side inductance current is controlled to be constant under different working conditions, and then zero-voltage switching-on of a switching device in a wide operation range and zero-current switching-off of an anti-parallel diode are achieved.

The invention provides an RTDS simulation-based DC booster control method and system for new energy grid connection, and relates to the technical field of new energy grid connection control, and the method comprises the steps: building an RTDS-based DC booster control simulation model for new energy grid connection; operating the control simulation model; acquiring voltage and current data of a low-voltage side and voltage and current data of a high-voltage side of the direct-current booster; obtaining output data of new energy direct current grid connection; based on the voltage and current data of the low-voltage side and the high-voltage side of the direct-current booster, an abnormal analysis value of the direct-current booster is obtained through an abnormal analysis method of the direct-current booster; based on the voltage and current data of the high-voltage side and the output data of the new energy direct current grid connection, an output anomaly analysis value is obtained through an output anomaly analysis method; and controlling the direct current booster through a neural network PID control algorithm according to the abnormal analysis value and the output abnormal analysis value of the direct current booster. According to the invention, the regulation and control accuracy of the DC booster for new energy grid connection is improved.

Embodiments of this application provide a power conversion apparatus and a charging apparatus. The power conversion apparatus includes an AC-DC conversion circuit, a power controller, and a circulating current controller. The power controller is configured to control the AC-DC conversion circuit to convert a received alternating current into a first direct current and output the first direct current. The circulating current controller is configured to send a synchronization signal to another power conversion apparatus through a controller area network CAN bus. The synchronization signal is used to synchronize a carrier of the another power conversion apparatus with a carrier of the power conversion apparatus provided in embodiments of this application. According to the technical solutions provided in embodiments of this application, a circulating current between a plurality of power conversion apparatuses connected in parallel can be suppressed. This helps improve running stability of the charging apparatus.

Controlling a power converter circuit for a direct current (DC) power source is disclosed. The power converter may be operative to convert input power received from the DC power source to an output power and to perform maximum power point tracking of the power source. The power converter is adapted to provide the output power to a load that also performs maximum power point tracking.

A pull-up circuit contains a variable current source structured to supply current to a CC pin of a connector. A voltage detection circuit is structured to measure voltage at a CC1 pin and at a CC2 pin. A processor is structured to control the variable current source, and to detect moisture adhered to the CC1 pin and the CC2 pin, with reference to an output of the voltage detection circuit.

The invention provides a control method of an intelligent fuse for DC cabinet protection and a related device. The method comprises the following steps: acquiring first current data and a first environment parameter set of a photovoltaic module in a preset first time period; determining a first protection threshold according to the first current data; acquiring second current data and a second environment parameter set of the photovoltaic module in a preset second time period; adjusting the first protection threshold according to the first environment parameter set and the second environment parameter set to obtain a second protection threshold; acquiring reference temperature data of the DC cabinet in a preset second time period; adjusting the second protection threshold according to the reference temperature data to obtain a third protection threshold; determining a current state according to the second current data and a third protection threshold value; and the intelligent fuse is controlled to perform circuit breaking processing according to the current state so as to ensure the operation safety of the DC cabinet. By dynamically and accurately adjusting the protection threshold, the safety of the DC cabinet can be improved.

A power conversion device includes a DC / DC conversion circuit and a DC / AC conversion circuit, the DC / DC conversion circuit is configured to connect to an energy storage unit and the DC / AC conversion circuit, the DC / AC conversion circuit includes a positive bus, a negative bus, and a neutral line, the DC / AC conversion circuit is configured to connect to an grid. An input voltage of the DC / DC conversion circuit is a voltage between the positive bus and a positive end of the energy storage unit, or a voltage between a positive end of the energy storage unit and the neutral line, or a voltage between the neutral line and a negative end of the energy storage unit, or a voltage between a negative end of the energy storage unit and the negative bus. An output voltage of the DC / DC conversion circuit is half of a direct current bus voltage.

The invention discloses a power supply processing circuit with slow start, combination and high-side eFuse functions, and the circuit comprises a slow start module which is used for the slow start of a power supply, and the slow start time is linearly adjustable; the high-side current-limiting e-Fuse module is used for simulating a single over-current fusing function of a common fuse through two self-reset switches to carry out over-current protection when the total current of the circuit reaches a threshold value, or simulating a self-recovery fuse through a self-locking switch to carry out over-current protection in a hiccup protection mode; the low-power-consumption combination module is used for realizing low-power-consumption multi-path power supply combination through discrete semiconductor devices; and the front protection module is used for providing bypass spike pulse voltage and a reverse connection prevention function for each power supply branch. According to the circuit, the circuit design is simplified, the cost is reduced, a stable and reliable power supply is provided, and meanwhile, the circuit can be integrated into a specific board card.

A battery system is mounted on an eVTOL. The battery system includes a battery, an auxiliary battery, and a charge-related equipment. The battery supplies power to a drive target including a rotor blade of the eVTOL. The auxiliary battery charges the battery. The charge-related equipment controls charging from the auxiliary battery to the battery. The charge-related equipment has a function of electrically connecting or disconnecting the auxiliary battery and the battery. It is possible to reduce bias in ion concentration caused by discharge during a flight by temporarily charging the battery from the auxiliary battery and changing the direction of the current so as to reduce the temporary deterioration. Thus, the safety of the flight can be enhanced.

The invention relates to the field of electric power engineering, in particular to a direct current remote supply communication system based on a cable trench, which comprises a monitoring terminal, a comprehensive monitoring platform, a local module and a remote module, compared with a direct-current remote supply technology in the prior art, the direct-current remote supply device has certain power supply capacity for equipment in a cable trench, but has the defects that on one hand, different power supply requirements of different equipment cannot be met, for example, the power supply requirement of timing starting or manual control starting is needed, and resource waste is caused, and on the other hand, the direct-current remote supply device cannot meet the power supply requirements. The power supply state cannot be sensed, and problems cannot be found in time; the communication system transmits the power supply condition of the direct-current remote power supply equipment to the platform through the network communication technology, can monitor the power supply state in real time, has higher reliability, can check the state of a power supply line through the system platform, can perform early warning in time, improves the fault processing capability, can control power supply according to the requirements of the electric equipment, and improves the power supply efficiency. And unnecessary power consumption is reduced.

The invention discloses a DC power distribution scene division method and system based on improved K-means, and the method comprises the steps: obtaining the output demands, reactive power regulation capacities and active power regulation capacities of power supply nodes in all time periods, and calculating an operation similarity index between every two power supply nodes; calculating an electrical distance between every two power supply nodes in each time period based on the sensitivity matrix; correcting the operation similarity index by using the electrical distance to obtain the weight of the connection edge of every two power supply nodes in each time period; adopting a modularity method, and establishing a reference measurement index in each time period by utilizing the weight of each connecting edge and the clustering mark variable; in each time period, each power supply node is clustered, and when the maximum difference value between the clustered measurement index and the reference measurement index is less than zero, each cluster center obtained by clustering is used as a core power supply node of each time period, each type of nodes and the core power supply node are clustered, and each DC power distribution and utilization system scene is obtained; and a more accurate and comprehensive scene division effect is realized.

A multi-phase power converter includes at least two power conversion circuits and a control signal generation unit. Each power conversion circuit includes a switch bridge arm formed by an upper switch and a lower switch connected in series. The control signal generation unit receives an output current of the multi-phase power converter and acquires a loading condition of the multi-phase power converter according to the output current, and provides control signals for each upper switch and each lower switch. The control signal generation unit correspondingly turns on or turns off the upper switches and the lower switches according to the loading condition being a light-loading condition so that the at least two switch bridge arms are alternately driven.

The invention provides an isolation circuit for a hydrogen production system and a renewable energy hydrogen production system comprising the same, the isolation circuit comprises at least one DC conversion module and at least one DC-AC converter, and the DC conversion module comprises a single output port and a multi-output port; a single output port of the DC conversion module is coupled with the DC side of the DC-AC converter; a plurality of output ports of the DC conversion module are coupled with a plurality of external unidirectional power flow units and / or bidirectional power flow units, and the unidirectional power flow units at least comprise hydrogen production units; and the AC end of the DC-AC converter is coupled and connected with an external AC power grid or a DC power grid in series. According to the scheme, the application requirements of two coupling situations are met at the same time, various types of external units are effectively fused, all parts in the system are fused into a whole, the cost is reduced, and meanwhile positioning and maintenance of faults are facilitated.

To provide a vehicle power supply system which decreases number of batteries without deteriorating redundancy of the power supply system.SOLUTION: A vehicle power supply system 1 comprises: a first power system 10 which supplies electric power from a first power source 41 to a first load 11 related to travel control of a vehicle V; and a second power system 20 which supplies electric power from a second power source 42 to a second load 21 related to the travel control of the vehicle V. The vehicle power supply system 1 includes: a system connection part SW3 which can connect and disconnect with the first power system 10 and the second power system 20; a second power connection part SW2 which can connect and disconnect with the second power source 42 and the second load 21; and a control part 211 which switches, when abnormality of the second power source 42 is detected, the second power connection part SW2 from a connection state to a cut-off state and switches the system connection part SW3 from a cut-off state to a connection state.SELECTED DRAWING: Figure 1

A power supply system can include an electrical power source and a power converter connectable to a load. The electrical power source can provide a first DC voltage with a first potential difference (VH) between a first DC potential output and a second DC potential output, and a third DC potential output having a potential between the potential at the first DC potential output and the potential at the second DC potential output. The power converter can provide a second voltage with a second potential difference (VL) between a first potential output (V+) and a second potential output (V−). The second potential difference (VL) can be less than the first potential difference (VH). The power converter can electrically isolate the first DC voltage from the second voltage, and the second potential output (V−) can be connected to the third DC potential output using a first connection including an impedance.