913results about "Dc source parallel operation" patented technology

An electric vehicle charging system comprising a Direct Current (DC) distributor, a site controller, one or more alternating current (AC) / DC rectifiers connected to the DC distributor and the site controller, and an electric vehicle charger having one or more DC / DC converters connected to the DC distributor and a charge controller in communication with the site controller and each of the one or more DC / DC converters. The one or more AC / DC rectifiers are decoupled from the one or more DC / DC converters.

The invention discloses a light-diesel hybrid energy storage system and a control method thereof, and belongs to the field of microgrids. The system comprises a photovoltaic power generation unit, a diesel generator set, a hybrid energy storage unit (a storage battery and a super capacitor), an AC / DC bus, a bidirectional AC / DC converter and a system controller. The controller executes hybrid energy storage frequency division control (without sampling load power and distributing power through bus voltage), V / f control and nine multi-mode energy management strategies, and monitors parameters such as photovoltaic output, load power, energy storage charge state and the like in real time to realize intelligent mode switching. The super capacitor preferentially responds to the pulse load, and the voltage fluctuation ratio is smaller than or equal to 5%; the service life of the storage battery is prolonged in combination with energy storage charge state threshold management; photovoltaic maximum utilization enables the system efficiency to be greater than or equal to 90%, and the diesel oil consumption is obviously reduced. The method is suitable for power grid coverage difficulty scenes such as off-network communication base stations, remote sentries and emergency power supply stations, and has high reliability and maneuverability.

The invention relates to the technical field of power systems, and discloses a self-adaptive equalization control method, system and device for the state of charge of energy storage units of an optical storage direct current micro-grid and a medium, and the method comprises the steps: building a system model comprising a photovoltaic power generation assembly and a plurality of parallel energy storage units, constructing a droop control coefficient adjustment mechanism associated with the state of charge of each energy storage unit, and realizing dynamic nonlinear adjustment of the control coefficient along with the state of charge; meanwhile, a bus voltage secondary compensation mechanism based on the average value of the output voltage of the energy storage unit and a current balance adjustment mechanism based on the virtual voltage drop difference are constructed; and overlapping the two types of compensation quantities to a voltage control instruction of each energy storage unit, and synchronously realizing the voltage stabilization of the direct-current bus and the rapid equalization of the charge states of the energy storage units. Manual intervention is not needed, uneven power distribution caused by line impedance difference or operation condition change is effectively restrained, the system reliability can be improved, and the energy storage service life can be prolonged.

The invention relates to the technical field of off-grid renewable energy hydrogen production, and discloses an off-grid alkaline hydrogen production system and a power adaptive distribution and safety control method thereof, the off-grid alkaline hydrogen production system comprises a renewable energy power supply unit, a parallel electrolytic cell module, a gas-liquid treatment system and a main controller; in the Faraday hydrogen production mode, the bubble volume is compressed by adjusting the operation pressure so as to modulate the impedance characteristic of the electrolytic cell, and the energy efficiency is improved in cooperation with current control; and in the non-Faraday polarization hot standby mode, the voltage of the rectifier cabinet is controlled to be clamped to a non-gassing polarization interval, and liquid level plugging is constructed in the U-shaped communicating pipeline according to the fluid statics principle. The system is further provided with a transient buffering strategy based on the pneumatic capacity, and pressure attenuation is delayed through the gas dead zone volume when power is suddenly reduced. The problems of hydrogen production efficiency optimization, low-power safe hot standby and mechanical protection under wide power fluctuation are effectively solved.

The invention discloses a DC micro-grid multi-energy storage unit distributed control method and system and a medium, and the method comprises the steps: employing droop control for primary control of a multi-energy storage converter; the droop control is droop control of an improved self-adaptive droop coefficient obtained by adding a speed regulation factor and a power constraint factor of charge state equalization in the droop coefficient; for droop control of primary control, a PI consistency algorithm is adopted for secondary control. According to the method, the charge state of the energy storage unit can be quickly balanced, the bus voltage can be kept in a rated range, and the method has very high robustness for load fluctuation, communication delay and network faults in the direct-current micro-grid.

The invention discloses a hybrid parallel direct-current power supply system, a charge and discharge control method and a medium, and the system comprises the hybrid parallel direct-current power supply system which comprises a direct-current bus; the power conversion module comprises two groups of three-port converters and a plurality of groups of two-port converters, the three-port converters are connected in parallel with super capacitor banks and a storage battery pack, the storage battery pack comprises a plurality of storage batteries which are connected in series, the two super capacitor banks are connected in series and then connected with the direct current bus, and the two-port converters are connected with the storage battery pack; a three-port converter, wherein the two-port converter is electrically connected with the direct current bus; and the charging and discharging control module is electrically connected with the battery conversion module so as to control the battery conversion module to realize a constant-current, constant-voltage and floating-charge staged charging strategy and an anti-interference discharging strategy. According to the invention, the complementation of the short-time / instantaneous power fluctuation of the super-capacitor compensation direct-current bus and the long-time power fluctuation of the storage battery compensation direct-current bus is realized.

A handheld jump starter device includes a rechargeable lithium battery pack comprising at least three lithium battery cells, a housing for enclosing the rechargeable lithium battery pack, and a jumper cable assembly removably attachable to the housing, the jumper cable assembly comprising a plug and a pair of cables, wherein the plug is configured to attach to the housing in a specific orientation.

A DC microgrid has increased DC bus voltage inertia without adding large physical capacitors. A Virtual Inertia Enhancement Controller (VIEC) of a DC-DC converter emulates a DC machine's mechanical inertia characteristics through a virtual capacitor which compensates for a power imbalance causing DC bus voltage fluctuations. When a battery charges and generated photovoltaic (PV) power is more than the load power, VIEC controls the PV's DC-DC converter to the DC bus. When the battery discharges and generated PV power is less than load power, VIEC controls the battery's DC-DC converter to the DC bus. VIEC controls both the PV's DC-DC converter and battery's DC-DC converter to the DC bus when generated PV power is more than the load power and battery is fully charged. VIEC emulates an additional virtual capacitance in parallel with DC link capacitors. DC bus voltage fluctuations are significantly reduced by the VIEC emulating virtual capacitors.

The invention provides a DCDC converter, a control method thereof and a communication base station power supply system. A busbar connecting end of the DCDC converter is connected with a DC busbar, and a battery connecting end of the DCDC converter is connected with a battery module; the DCDC converter is used for adjusting the duration that the current of the battery connecting end is greater than or equal to a first current threshold to a second duration when the duration that the current of the battery connecting end is less than a first current threshold is less than a first duration and the voltage of the battery connecting end is less than a first voltage threshold, or adjusting the duration that the current of the battery connecting end is greater than or equal to the first current threshold to a second duration, adjusting the duration that the voltage of the battery connection end is greater than or equal to the first voltage threshold to a third duration; and when the duration in which the current of the battery connecting end is less than the first current threshold is greater than or equal to the first duration, adjusting the duration in which the current of the battery connecting end is greater than or equal to the first current threshold to a fourth duration. The DCDC converter can prevent the battery module from entering the sleep mode in the process of controlling the battery module.

The utility model discloses a photovoltaic energy storage and charging integrated circuit and a charging robot applying the same. The circuit comprises a main control module, an input interface, an energy storage battery pack and a direct current bus output interface, the input interface is connected with a photovoltaic direct current input end, a mains supply alternating current input end and a photovoltaic charging controller, and the photovoltaic charging controller converts a photovoltaic input signal accessed by the photovoltaic direct current input end into a controllable direct current output signal; the mains supply alternating current input end converts a mains supply alternating current signal into a direct current output signal through the alternating current-to-direct current module; the energy storage battery pack is connected with the photovoltaic DC input end and the commercial power AC input end through the bidirectional DC-to-DC module; the direct current bus output interface integrates a photovoltaic direct current input end, a mains supply alternating current input end and direct current output of the energy storage battery pack, and provides controllable direct current charging for an external load; and the main control module coordinates the work of each module and supports an automatic switching electricity supplementing and discharging strategy based on a peak-valley electricity price period. The electric energy loss is reduced, and the charging efficiency is improved.

The invention discloses a DC bus voltage stabilization system and method for an AC / DC micro-grid. The method comprises the following steps: transmitting photovoltaic electric energy to a DC bus through a Boost converter of a photovoltaic power generation unit; a super capacitor energy storage branch and a storage battery energy storage branch of the hybrid energy storage unit are connected in parallel to a direct current bus through independent bidirectional Buck-Boost converters; the direct current bus electric energy is converted into alternating current electric energy through a grid-connected inverter of the alternating current inversion grid-connected unit; after the direct-current bus voltage, the voltage of each unit, the current and the energy storage charge state information are obtained through a sampling link of the special control unit, an adjusting instruction is generated through operation, the direct-current bus voltage is stably controlled, and the stability of the direct-current bus voltage is kept. Through hardware design optimization, the DC bus voltage anti-disturbance capability is significantly improved, and the service life of energy storage equipment is prolonged.

The invention discloses a data center combined cooling heating and power supply system based on mixed hydrogen energy and a control method thereof, and the system comprises a hydrogen source supply and storage module which is used for inputting hydrogen for power generation, a power generation and energy supply module which is used for converting the hydrogen into electric energy, and a DC micro-grid module which is used for providing the electric energy for a data center. The heat management and application module is used for recycling and applying heat generated during power generation, and the control and protection module is used for controlling the modules. According to the invention, hydrogen energy efficient power generation, waste heat cascade recovery and intelligent scheduling are realized through modular cooperation, the problems of high carbon emission, response delay and energy waste in the prior art are solved, and the system has the advantages of significantly reducing carbon emission, optimizing electric energy use efficiency, improving power supply continuity and energy utilization rate, and simultaneously realizing combined supply of cooling, heating and power.

A charging device comprises a power supply module, an energy storage unit, a direct current bus, a monitoring module and an output module, and the monitoring module is configured to control the power supply module when the output module does not detect that an external load is connected and the voltage of the direct current bus is a first preset voltage threshold. A starting signal is output to the power supply module; and when the voltage of the direct current bus is a second preset voltage threshold value, a stop signal is output to the power supply module, and the first preset voltage threshold value is smaller than the second preset voltage threshold value. According to the embodiment of the invention, the circuit is simple in structure, does not need to introduce an extra multi-stage topology or complex control chip, is low in overall cost, is high in compatibility, and is suitable for a multi-port PD charger and other high-efficiency power products.

The charging system comprises: two chargers which deliver instantaneous electrical energy for charging an electrical device; an electrical chain which links the two chargers; three charging points that are electrically connected to the chargers via the electrical chain; a switching system which connects or does not connect a charging point to the first or to the second charger; a control system which controls the switching system.

Described is an operating machine (1) provided with: an electrical system (2), a plurality of user devices powered by the electrical system, including an electric motor (21, 22) set up to supply the power required by one or more other user devices, an electrical charge storage device (3) connected or connectable to the system (2) and arranged to power the user devices of the machine (1), a control element which can be operated by an operator to control the operation of one or more user devices and an electronic processing unit comprising a power management module (41) configured to adjust a power delivered to the user devices as a function of at least one safety threshold of a power which can be delivered by the storage device (3). At least one generator unit (26) connected or connectable to the electrical system (2) is made available and in addition the power management module (41) is configured to adjust the operation of the generator unit (26) so that it can power the storage device (3) and / or the user devices, through the system (2), based on a power requested by the user devices themselves.

The invention is suitable for the technical field of power grid control, and provides an isomerization direct current micro-grid control parameter calculation method and device, and the method comprises the steps: carrying out the equivalent processing of a target isomerization direct current micro-grid, and obtaining an equivalent converter model; calculating a current proportionality coefficient, a current integral coefficient, a voltage proportionality coefficient, a voltage integral coefficient and a droop coefficient of the equivalent converter model based on the equivalent converter model; and calculating a current control parameter, a voltage control parameter and a droop coefficient of the interleaved three-level DC / DC converter and a current control parameter, a voltage control parameter and a droop coefficient of the conventional two-level DC / DC converter based on the current proportionality coefficient, the current integral coefficient, the voltage proportionality coefficient, the voltage integral coefficient and the droop coefficient of the equivalent converter model. The problem that the control parameters of the isomerized direct-current micro-grid are difficult to calculate in the prior art can be solved.

A power distribution system comprises a plurality of energy storage modules coupled in series. A plurality of electrically isolated power converters are each coupled across one or more of the energy storage modules. When enabled, the power converters provide a low voltage output to an output of the power distribution system. A control system controls the power converters to provide the low voltage output. The control system selectively enables the power converters to balance states of charge of the energy storage modules.

A stationary energy storage system (1) is described. This energy storage system (1) comprises a battery rack (2) with a plurality of cells and a load terminal (10) to which a load (16) is connected, at least in the intended operating state. Furthermore, the energy storage system (1) comprises an AC / DC converter (14) connected between a grid connection (12) and the load terminal (10) for providing operating energy at the load terminal (10), and a DC / DC converter (6) connected between the battery rack (2) and the load terminal (10) for providing operating energy at the load terminal (10). The energy storage system (1) also comprises switching means (8) by means of which the AC / DC converter (14) and the DC / DC converter (6) can be reversibly connected to the load terminal (10).The switching means (8) are designed to automatically connect the DC / DC converter (6) to the load connection (10) in a power-free state on one AC / DC converter side, independently of any power supply via the AC / DC converter side.

This provides an electrical system for use in high-voltage DC multi-terminal switching stations. [Solution] The electrical system (300) comprises a first busbar (302a), a second busbar (302b), a resistor module (306) comprising one or more resistors and electrically coupled between the first busbar and the second busbar, a first switching element (307) electrically coupled between the first busbar and the second busbar and in series with the resistor module, and a plurality of power transmission media (304), wherein each power transmission media (304) of the plurality of power transmission media is electrically coupled to the first busbar via its respective second switching element (308), and each power transmission media of the plurality of power transmission media is electrically coupled to the second busbar via its respective third switching element (310).

The communication base station micro-grid system provided by the utility model improves the power supply reliability and energy efficiency of a base station and reduces the dependence on a traditional power grid through integrating distributed energy and an intelligent management system. The system comprises a photovoltaic system, an energy storage battery pack BMS system, a 4G communication module and a power grid access module. The photovoltaic system is composed of a photovoltaic cell panel and a light stacking controller and provides 48V direct current. And the energy storage battery pack BMS monitors and manages the battery state in real time. And the 4G communication module realizes data transmission and remote monitoring. The power grid access module provides a standby power supply. The system adopts a 48V direct-current bus, so that the energy efficiency is improved and the loss is reduced. The stacked light controller optimizes photovoltaic output and has comprehensive fault self-test and protection functions. Real-time monitoring and remote management are realized through the 4G communication module, and the reliability and maintenance efficiency of the system are improved.

The invention provides a fuel cell multi-port converter for a hybrid power system and a design method and system.The fuel cell multi-port converter comprises an input port module, a multi-mode boosting module and an output port module, and the input port module comprises a plurality of fuel cell input ports; according to the multi-mode boosting module, an output capacitor CO is arranged at a circuit output port in parallel, the output voltage is boosted according to the charge pump principle, and the output voltage gain is remarkably improved; meanwhile, the inductors which are arranged in a staggered parallel mode and the corresponding switch tubes are adopted to form a floating parallel structure, the structure reduces input current ripples by staggering current peak value superposition, and current abrupt change caused when the inductors are switched between parallel connection and series connection is avoided; stable voltage and current can be output when the fuel cell is used for supplying power; the bidirectional DC-DC converter is adopted in the hybrid power system for conversion control, the overall control process is simple, the bus voltage fluctuation is small during switching control of different modes, and the output voltage and current are stable.

This description relates to a power electrical circuit (100), comprising at least: - several power supply sources (102, 103); - an electrical interconnection bus (104) coupled to the power supply sources (102, 103); - switching devices (114 - 120) each comprising at least one thyristor (124, 128, 132, 136) and one field-effect transistor (122, 126, 130, 134) coupled in parallel with each other, and configured to couple the power supply sources (102, 103) in series or in parallel.

The present invention proposes a parallel multi-source power supply system with unified output, which includes the first power supply having the first and the second USB-C connectors, the second power supply having the third USB-C connector electrically connected to the first power supply in parallel through the second USB-C connector. The first power supply is configured to operate in a constant current and constant voltage (CCCV) mode to output the first power, while the second power supply is configured to operate in a constant voltage (CV) mode to output the second power. The second power is transferred to the first power supply and unified with the first power to power an external electronic system through the unified output. The amount of the second power transferred to the first power supply is determined by a charging agreement through communicating between the first power supply and the external electronic system.

The invention discloses a DC micro-grid power buffer safety control method and device aiming at FDI attack, and relates to the technical field of power electronics and power system control. The method comprises the steps of obtaining a block matrix of a DCmGs system node current equation according to the Kirchhoff's current law; adopting Kron simplification to eliminate internal node voltage, obtaining a relation between a port current vector and a voltage vector, and constructing a small signal model of the port voltage vector; based on a small signal model, a linear mapping relation about disturbance of bus voltage to equivalent input impedance of each power buffer is constructed, modeling and linearization are carried out on energy and adjustable input impedance of each power buffer, a network coupling small signal model is constructed, and a second-order high-gain observer is designed; and if the FDI attack exists in the DCmGs system, an anti-FDI attack elastic control law is designed, so that the closed-loop voltage in the DCmGs system and the energy of a power buffer are quickly converged, and buffeting is inhibited. By adopting the method, the DCmGs system can be prevented from buffeting in an unknown FDI attack scene.

The invention discloses an instantaneous power distribution method and device of an isomorphic energy storage converter, terminal equipment and a storage medium, and belongs to the technical field of energy storage converter power distribution.The method comprises the steps that the energy storage output current, the energy storage output voltage, the energy storage input current and the output voltage instruction value of the isomorphic energy storage converter to be distributed are obtained; further calculating to obtain a first output current, a first correction current reference and a second correction current reference; performing gain amplification and difference suppression to obtain a third correction current reference; performing current outer loop control to obtain a phase shift angle of the isomorphic energy storage converter; and finally, performing on-off control on the isomorphic energy storage converter through the phase shift angle to obtain the instantaneous distribution power of the isomorphic energy storage converter. According to the invention, the problem that the continuous power oscillation of the isomorphic energy storage converter is caused because the same instantaneous power distribution cannot be carried out in the prior art can be solved.

The application discloses a propelling system and an aircraft, wherein the propelling system comprises a power generation system and a distributed system; the power generation system comprises a pre-ionization device and a magnetic fluid power generation device; the pre-ionization device can ionize gas to generate ionized gas; the magnetic fluid power generation device is suitable for the ionized gas to pass through; the distributed system comprises a plurality of propellers; any one of the propellers is electrically connected with the magnetic fluid power generation device. The magnetic fluid power generation device is used to replace an internal combustion engine to drive a generator to generate power; when the ionized gas passes through the magnetic fluid power generation device, the magnetic fluid power generation device can directly generate electric energy, so that the electric energy can be generated without mechanical conversion, the energy conversion efficiency is improved, and the electric energy is easy to transmit, that is, the energy transmission efficiency is also improved.

A power source assembly includes a plurality of strings electrically connectable to a load. Each of the plurality of strings includes a fuel cell module and a DC / DC converter electrically connected to the fuel cell module. Each of the plurality of strings is arranged in parallel to each other of the plurality of strings.

A solar power generation system is provided. The solar power generation system includes a plurality of photovoltaic (PV) arrays configured to generate low voltage direct current (LVDC) power, a plurality of DC to DC converters, each of the plurality of DC to DC converters configured to convert the LVDC power to medium voltage DC (MVDC) power, a plurality of branch MVDC busses, a main MVDC bus configured to receive MVDC power from each of the plurality of branch MVDC busses, at least one inverter configured to receive MVDC power from the main MVDC bus and convert the MVDC power to medium voltage alternating current (MVAC) power, and a distribution transformer configured to receive MVAC power from the at least one inverter and convert the MVAC power to high voltage AC power.

The invention relates to a power control system and a vehicle including the same. A power control system according to one embodiment of the present invention comprises: a first converter configured to convert a voltage of a high-voltage battery into a first voltage; a first battery; a first power distributor; a second converter configured to convert a voltage of the high-voltage battery into a second voltage; a first power distributor configured to distribute power of the first converter to the first battery and the first voltage load; a second converter configured to convert a voltage of the high-voltage battery into a second voltage; a second power distributor configured to distribute power of the second converter to a second battery and a second voltage load; the bidirectional converter is connected between the first power distributor and the second power distributor. Here, each of the first power distributor and / or the second power distributor includes at least one switch, and the at least one switch is controlled to be turned on or off in response to an occurrence of a set fault condition.