544results about "Conversion with reversal" patented technology

The invention relates to the technical field of flexible direct-current power transmission, in particular to a centralized local energy storage modular multilevel converter MMC-CLES topology which comprises three phase units, each phase unit comprises an upper bridge arm and a lower bridge arm, and each upper bridge arm and each lower bridge arm comprise a bridge arm reactor arranged at one end, close to a power grid, of the bridge arm; a plurality of identical sub-modules SM which are connected to a power grid through a bridge arm reactor; the upper bridge arm and the lower bridge arm form a symmetrical structure; an energy storage sub-module is arranged at the position where the three-phase unit is directly connected with the direct-current bus. According to the invention, the control system is simplified, and the hardware cost and the control complexity are reduced. Voltage stress and current stress are smaller, higher power can be borne, and the high-power capacitor is suitable for being applied to high-power occasions. And moreover, due to the symmetrical layout, the control method is relatively simple, soft switching can be realized, and the power divider can be used as a multi-port component unit.

The invention relates to the technical field of power electronics, in particular to an inverter load feed-forward compensation method and system based on dynamic hysteresis regulation. The method comprises the following steps: acquiring an instantaneous load current signal of an inverter system; wherein when the load current suddenly changes, the bus voltage on the direct current bus fluctuates; performing low-pass filtering on the instantaneous load current signal to extract a direct current component of the load current; determining a dynamic hysteresis limit value according to the instantaneous load current signal, the direct current component and the amplitude adjustment coefficient; comparing the instantaneous load current signal with a historical current feed-forward signal, updating the historical current feed-forward signal according to a comparison result and a dynamic hysteresis limit value, taking the updated historical feed-forward current signal as an updated feed-forward current signal of the current control period, generating a compensation current based on the updated feed-forward current signal, and outputting the compensation current to the current control period. And the compensation current is applied to the corresponding direct-current bus so as to suppress bus voltage fluctuation caused by load abrupt change.

The invention relates to a controllable turn-off converter valve for a high voltage direct current (HVDC) system, each converter valve arm comprises a valve arm voltage-sharing device and a plurality of cascaded controllable turn-off converter modules, and each controllable turn-off converter module comprises an assembly voltage-sharing device and a plurality of cascaded controllable turn-off converter assemblies. Each controllable turn-off current conversion assembly is configured to comprise at least one voltage-sharing circuit and at least one controllable switching device, and two ends of each controllable switching device are provided with one voltage-sharing circuit in parallel. Therefore, the controllable turn-off converter valve can realize voltage sharing at each level, the requirement of the controllable turn-off converter valve on the consistency of controllable switching devices is reduced, a large number of controllable switching devices can be connected in series in the same converter valve arm, and reliable conversion of extra-high voltage direct current transmission at the voltage level of + / -800 kilovolts and above is realized. The problem of commutation failure of the extra-high-voltage direct-current type converter valve is solved, and safe and stable operation of a power system is ensured.

The invention discloses an intelligent charging pile core module based on a VIENNA structure, an electric energy quality management method, system and equipment and a storage medium, and belongs to the field of electric power system energy storage equipment.The intelligent charging pile core module based on the VIENNA structure comprises the steps that an integrated power conversion unit is constructed, the power conversion unit adopts a VIENNA rectifier topology, three-phase alternating current is converted into direct current, and the direct current is converted into direct current; a harmonic suppression structure linked with the control interface is arranged; state information in the operation process is collected and serves as input of the control strategy module; based on the state information, a modulation control instruction is generated in the control strategy module to drive the switching action of the power conversion unit; on the basis of the modulation control instruction, the switch control is executed, meanwhile, the direct-current side midpoint potential of the power conversion unit is synchronously adjusted, and the distribution of direct-current bus capacitor voltage is controlled; and identifying the current operation condition according to the state information, switching to a control template corresponding to the operation condition in the control strategy module, and generating a modulation control instruction.

The invention relates to a multi-mode control method and device for an energy storage converter. The method comprises the following steps: aiming at the operation of an energy storage converter in a network following mode, establishing a second-order infinite impulse response IIR filter, and establishing a low-voltage ride-through control strategy based on conforming to repetitive control; for the operation of the energy storage converter in an off-grid mode, a three-phase four-bridge-arm topology is adopted to provide a zero-sequence path, and a preset proportional multi-resonance control strategy is established; establishing a parallel pre-synchronization control strategy aiming at the operation of the energy storage converter in a network construction mode; and realizing multi-mode control of the energy storage converter based on a low-voltage ride-through control strategy conforming to repetitive control, a preset proportional multi-resonance control strategy and a parallel pre-synchronization control strategy. Any resonant frequency and filtering radius can be set to suppress the harmonic peak, the system stability is ensured, meanwhile, compared with a traditional pre-synchronization method, pre-synchronization can be completed without additional control links by only utilizing the self frequency modulation characteristic, and control resources are greatly saved.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

The invention relates to the technical field of power conversion, in particular to a collaborative optimization control method, system and equipment of a multi-mode power conversion device and a storage medium. The method comprises the following steps: constructing a double-layer collaborative architecture by collecting multi-source heterogeneous operation parameters, obtaining a device operation state, power grid dynamic characteristics and environment change information, establishing a cross-level communication protocol to realize data synchronization, and outputting a real-time working condition feature vector; deploying a dynamic mode switching engine based on a real-time working condition feature vector, triggering multi-mode operation strategy reconstruction through a state transition probability model, constructing a self-adaptive switching mechanism comprising a parallel power supply mode, an island operation mode and a hybrid modulation mode, and establishing a composite fault response system to realize pre-diagnosis and grading disposal of an abnormal state; millisecond-level real-time control is implemented in the edge control layer to generate a pulse width modulation driving signal, multi-target global optimization is implemented in the cloud optimization layer to dynamically adjust an operation parameter combination, and closed-loop control is formed through bidirectional data interaction and strategy feedback.

A system comprises: a high voltage (HV) direct current (DC) to DC converter (HVDC) including: one or more transformers; a bridge driver connected to a primary side of the one or more transformers; and one or more bridge rectifiers connected to a secondary side of the one or more transformers, the one or more bridge rectifiers including one or more bridge rectifier switches; a low voltage (LV) DC to DC converter (LVDC) connected to the HVDC; and a boost converter including: an inductor connected to the one or more bridge rectifier switches; and one or more boost configuration switches operable, in combination with the one or more bridge rectifier switches, to configure the boost converter into each of a bypass configuration and a boost configuration, to regulate a voltage at the LVDC.

A power electronics converter includes a substrate and a converter commutation cell including a power circuit. The power circuit includes at least one power semiconductor switching element and at least one capacitor. Each power semiconductor switching element is comprised in a power semiconductor prepackage. An electrical connection side of the respective power semiconductor prepackage is spaced apart in a z direction from the substrate so as to define a prepackage gap between the substrate and the electrical connection side. At least a portion of the prepackage gap is filled with an electrically insulating material having voids. A converter parameter σ defined as an insulation fill factor divided by a maximum void size is greater than or equal to 10 / mm. The insulation fill factor is defined as a cumulated volume of the voids subtracted from a volume of the electrically insulating material divided by the volume of the electrically insulating material.

The invention provides a control method of a single-stage AC / DC conversion circuit, a controller and a power supply module. The single-stage AC-DC conversion circuit comprises a primary side bridge arm switching circuit, an isolation circuit and a secondary side bridge arm switching circuit. The method comprises the following steps: acquiring an alternating current side voltage, and determining a maximum phase voltage and a minimum phase voltage based on the alternating current side voltage; and in response to a shutdown instruction, controlling the primary side bridge arm circuit corresponding to the maximum phase voltage and the primary side bridge arm circuit corresponding to the minimum phase voltage to act, so that an electrical loop is formed between the midpoints of the two bridge arms and the primary side of the isolation circuit, and the direction of the inductive current and the direction of the inductive voltage on the primary side of the isolation circuit in the electrical loop are opposite. The invention aims to realize safe shutdown of the primary side bridge arm switching circuit in the single-stage AC / DC conversion circuit and improve the safety and stability of the shutdown execution process of the single-stage AC / DC conversion circuit.

The invention discloses an energy conversion device, an inversion device and an energy conversion system, and the energy conversion device at least comprises a first transmission interface which comprises a battery connection terminal suitable for being connected to a battery pack; the second transmission interface is arranged to be at least capable of accessing an alternating current power grid; the energy conversion circuit at least can convert the electric energy input by the first transmission interface and then feed the electric energy to the second transmission interface; the controller is at least in communication connection with the first transmission interface and is electrically connected with the energy conversion circuit; wherein the controller is configured to at least control the energy conversion circuit to carry out energy conversion on the energy input by the first transmission interface when the temperature of the battery pack is smaller than or equal to a temperature threshold value, so that the battery pack at least obtains heating heat energy.

An EV charger has an AC port, a variable voltage DC power supply connected to the AC port and comprising a controller having an input to receive charging parameters, a charge cable connector connectable to a battery, an interface connectable to the connectors and to the input of the DC power supply wherein the interface performs either translating a battery management system voltage command regarding charging parameters of the battery received via the charge cable connector into the input for the variable voltage DC power supply, or generating the input for the variable voltage DC power supply defining the charging parameters for the battery from measured information about the battery.

The utility model discloses an adapting structure, an inversion device and outdoor operation equipment, the adapting structure is configured to be electrically connected with electrical equipment, the electrical equipment comprises a first conductive assembly, and the adapting structure comprises a second conductive assembly movably arranged on the adapting structure. The power connection equipment can drive the second conductive assembly to move and form electric connection with the first conductive assembly. The second conductive assembly can be electrically connected with the electrical equipment through driving of the electrical equipment, and the design is ingenious.

Disclosed is a multi-port charger capable of charging a higher-voltage battery by boosting low DC charging voltage using an on-board charger (OBC) installed in a vehicle without adding a separate part or device and capable of being used for various applications, such as V2G and V2L, in addition to charging.

A power converting system includes a power converting device, a protection device, and a charging device. The power converting device is coupled to a first and a second power source. The protection device is coupled to the power converting device, a load, and a grid, and switches electrical connections among the power converting device, the load, and the grid. The charging device is coupled to the power converting device and a third power source. The power converting device charges the third power source through the charging device, or receives electricity through the charging device. Select at least one power source of the first power source, the second power source, the third power source and the grid to provide electricity to the load according to multiple preset modes.

The invention provides an AC soft start control method of a three-phase four-bridge-arm topology. The method comprises the following steps: S1; the power grid access state of the energy storage inverter is obtained, the power grid access state is identified according to alternating current incoming line modes, and the alternating current incoming line modes comprise a single-phase incoming line mode and a three-phase incoming line mode; a single-phase incoming line mode is adopted to control bus voltage, and the bus voltage is gradually increased to a target value; and after the bus voltage is stable, the three-phase incoming line mode is switched to continuously control the bus voltage to be output to a set value. Firstly, by slowly increasing the bus voltage and the output voltage in stages, the current peak value in the system starting process is remarkably reduced, and the impact current can be reduced by 30%-50%, so that a power device and a bus capacitor are effectively protected, and device damage caused by large current impact is avoided. And secondly, a dynamic neutral point compensation technology is introduced, so that the waveform quality of the output voltage is remarkably improved, the total harmonic distortion (THD) is lower than 3% and is superior to the performance which is usually higher than 5% in a traditional method, and the electric energy quality and the operation stability of the system are improved.

The invention provides a flexible direct current converter valve system and a modulation method thereof. Based on a novel hybrid module series structure, target voltage modulation is carried out by controlling a switch device trigger pulse in stages through polarity distribution of modulation wave voltage and bridge arm current. And executing a four-stage pulse adjustment process in an inversion or rectification mode, and dynamically managing the removal and input time sequence of the improved half-bridge power module. According to the method, the trigger pulse is accurately regulated and controlled according to the real-time polarity and the transition state of the voltage and the current, and the problems of instantaneous overcurrent and local overheating of a switching device under the overload condition in the traditional bridge arm topology are avoided. Through staged logic control, the system maintains the stability of the modulation wave voltage, reduces the thermal stress accumulation of the device, improves the endurance capability of the converter valve under a complex working condition, does not need external current limiting intervention, and enhances the operation flexibility and reliability.

The invention discloses network side equipment, a power supply control method and a computer readable storage medium, relates to the technical field of power supply batteries, and aims to solve the problem of poor controllability of a power supply battery system of a communication machine room. The network side equipment comprises a power supply module, a base station communication alternating current load, a base station communication direct current load and a control unit, the power supply module comprises a battery, a bidirectional AC-DC conversion module, a bidirectional DC-DC conversion module, a first switch, a second switch and a third switch, and a first end of the bidirectional AC-DC conversion module is electrically connected with an external alternating current power supply through the first switch; the first end of the bidirectional DC-DC conversion module is electrically connected with the second end of the bidirectional AC-DC conversion module through the third switch, and the second end of the bidirectional DC-DC conversion module is electrically connected with the battery; and the control unit controls the on-off states of the first switch, the second switch and the third switch according to the first parameter so as to adjust the working state of the network side equipment. According to the embodiment of the invention, the controllability of the power supply working mode of the network side equipment can be improved.

A dual power switching system selects a first power source or a second power source to supply power to a load coupled to an inductive device. The dual power switching system includes a first thyristor, a second thyristor, a third thyristor, a fourth thyristor, and a controller. The controller calculates a total magnetic flux according to a current magnetic flux of the inductive device and an expected magnetic flux of the second power source. When the power-supplying source is switched, the controller turns off the first thyristor and the second thyristor, and determines whether a commutable time is reached according to a power parameter of the first static transfer switch and the second static transfer switch. When the commutable time is reached, the controller correspondingly turns on at least one of the third thyristor and the fourth thyristor according to the total magnetic flux being less than a threshold.

What is proposed is a grid-connectable multilevel converter (112) configured for at least temporarily interfacing a three-phase power grid (106) and / or for at least temporarily providing a direct current mode; the multilevel converter (112) comprising: at least a first modular energy storage string having a plurality of energy sources and at least one power converter module, the at least one power converter module comprising at least two switching elements; the at least two switching elements being configured for selectively switching each of the plurality of energy sources to operate the at least first modular energy storage string in an alternating current mode, in which the at least first modular energy storage string is connectable to a first phase of the three-phase power grid (106); and the at least two switching elements being configured for selectively switching each of the plurality of energy sources to operate the at least first modular energy storage string in the direct current mode.

The invention discloses a reactive power optimization method for a bidirectional wireless electric energy transmission system of an electric vehicle, and belongs to the technical field of wireless electric energy transmission of the electric vehicle. Zero-voltage switching operation of all switching tubes is realized by changing phase shift angles in the grid-side full-bridge converter and the vehicle-side full-bridge converter; then obtaining the voltage and current of the alternating-current end of the vehicle-side converter or the grid-side converter and the phase difference in real time, and further obtaining the relative size of reactive power in the forward energy transfer state and the reverse energy transfer state; and the phase difference between the grid-side converter and the vehicle-side converter is adjusted in real time according to the corresponding relation between the reactive power and the external phase shift angle, so that optimal control of the reactive power in the two-way wireless power transmission system of the electric vehicle is realized. According to the invention, ZVS operation of all switching tubes in the system and optimal control of reactive power can be realized.

The invention relates to a multi-port electric energy router control method and device based on an MMC. The method comprises the following steps: for a five-port electric energy router based on a double-end back-to-back modular multilevel converter (MMC), connecting a middle-low voltage direct current bus by adopting an input-series output-parallel dual active bridge converter structure, and realizing module power balance of each port through input voltage balance control; in a network-following type control link of a double-end back-to-back modular multilevel converter (MMC), virtual synchronous generator control (VSG) is applied to a grid-connected power control port of the MMC, and virtual direct current motor control (VDMC) is applied to an energy storage port of the MMC; and determining an operation mode based on the power grid short-circuit ratio, and carrying out network following / network construction control switching on the MMC-based multi-port electric energy router under the strong / weak power grid condition. Through the control mode, the multi-port electric energy router can ensure the stability of direct current voltage and the balance of supply and demand of power under complex working conditions.

A non-isolated bidirectional high-voltage direct current battery charger is made compatible with a ground-fault circuit interrupter (GFCI) at the DC output by adapting the power converter to control, in response to voltage or current sensors, a net current difference between forward current and return current to remain below a threshold of the GFCI. This can be done without compromising safety in the case of actual ground faults.

A submodule (120) for a modular multilevel converter (102) includes a bridge cell (220) and an active power decoupling module (140). The bridge cell includes an energy storage capacitor (222) and a first bridge pair of power switches (224, 224') connected in parallel with the energy storage capacitor. The active power decoupling module includes first and second terminals (150, 152), a second bridge pair (169) of power switches (170, 170') connected between the first and second terminals and in parallel with the energy storage capacitor, and an inductor (166) connected in series with a power decoupling capacitor (168) to a junction between the power switches of the second bridge pair of power switches.

The invention relates to the technical field of power electronics, and particularly provides a double-rectification single-inversion redundant uninterruptible power supply system and a control protection method thereof, and the system comprises a power distribution system, a variable current power module and a control protection system. The power distribution system has double AC inputs, a common DC bus and AC outputs. The converter module comprises three converters, two of which serve as rectifiers and are connected in parallel with the direct current bus, and the other one serves as inverter output. The control method comprises the following steps: in a double-path load balancing mode, realizing power equalization through composite voltage control; in a single-path operation mode, fault seamless switching is realized based on load feedforward and adaptive slope control; in a power distribution mode, triggering according to capacity margin and cooperatively adjusting a droop coefficient based on an optimization target to realize power redistribution; and complete real-time fault protection logic is realized. According to the invention, uninterruptible power supply with high reliability and high electric energy quality is realized, and active regulation and control of power are realized.

The invention discloses a vehicle-mounted charger and a control method thereof, the vehicle-mounted charger comprises a direct current port, a first alternating current port, a second alternating current port, an alternating current-direct current bidirectional converter and a controller, and the second alternating current port comprises a first live wire end, a second live wire end and a first ground wire end. The controller selectively controls the AC-DC bidirectional converter to work in a first mode, and the first mode comprises the steps that DC electric energy received by the DC port is inverted, and first AC electric energy and second AC electric energy are output in a split-phase mode, so that the first AC electric energy is output through the first live wire end and the first ground wire end; and the second alternating-current electric energy is output through the second live wire end and the first ground wire end. The invention further provides a control method of the vehicle-mounted charger.

The utility model relates to the technical field of mobile power supplies, and provides a mobile power supply and inverter module circuit, and the mobile power supply comprises an MCU module, a power supply system, a screen display module, and an inverter module circuit. The power supply system is electrically connected with the battery module and the MCU module in the shell of the mobile power supply, and is used for obtaining a direct current signal from the battery module, outputting the direct current signal to a direct current load connected to the power supply system for power supply, and transmitting an output state signal of the direct current signal to the MCU module; the screen display module displays the output state of the direct current signal according to the direct current output state display control signal transmitted by the MCU module, the direct current output state display control signal is generated by the MCU module according to the output state signal of the direct current signal, and the user experience is improved; the inverter module circuit outputs an alternating current signal to the alternating current load and stops outputting the alternating current signal to the alternating current load when overload or overcurrent is detected, so that the stability of the mobile power supply is improved.

The embodiment of the invention discloses a modularized bidirectional converter and a phase locking method thereof. The bidirectional converter comprises a conversion circuit composed of a plurality of modules. Each module corresponds to one module control card; the first end of the conversion circuit is connected with a direct-current traction network, and the second end of the conversion circuit is connected with an alternating-current power grid; the system control card is configured to perform phase locking on the alternating current power grid to obtain a first phase in a later slow start stage, and synchronize the first phase to the module control card, so that the module control card controls the output voltage of the module based on the first phase; the post slow start stage represents that the voltage of the direct current side bus of the conversion circuit is buffered to a first threshold value, and the slow start stage comprises the post slow start stage; the module control card is configured to perform phase locking on the alternating current power grid in a non-slow start stage to obtain a second phase and control the output voltage of the module based on the second phase; in the non-slow start stage, it is characterized that grid connection is completed on the alternating current side of the bidirectional converter, and the module control card can sample the state of the alternating current.

A photovoltaic energy storage and bidirectional inversion conversion system, method, device and medium relate to the photovoltaic inverter field, and the system comprises a photovoltaic inverter, a photovoltaic input DC-DC module, a DC-DC output module, a battery bidirectional DC-DC module, a bidirectional DC-AC module and a DC bus module; the first end of the photovoltaic input DC-DC module is connected with the photovoltaic panel, and the second end of the photovoltaic input DC-DC module is connected with the DC bus module; the first end of the DC-DC output module is connected with the DC bus module, and the second end of the DC-DC output module is connected with the photovoltaic inverter; the first end of the battery bidirectional DC-DC module is connected with the DC bus module, and the second end is connected with the battery; the first end of the bidirectional DC-AC module is connected with the DC bus module, the second end is connected with the load, and the third end is connected with the photovoltaic inverter. According to the application, a direct-current side transformation path is adopted, and a mode relying on alternating-current side large-scale line transformation is replaced through collaborative design of all modules.

The invention discloses a dynamic inertia evaluation method for an active control type energy storage converter, and aims to solve the problem that the service life of system equipment is affected due to insufficient precision and real-time performance and insufficient coupling relation coordination between SOC and output power in a traditional inertia evaluation method. According to the method, a lightweight multilayer perceptron neural network is adopted, firstly, multi-scale feature extraction is carried out on active power and frequency variation of a power grid, then inertia real-time evaluation and trend prediction are realized through a hidden layer with residual connection and neuron adaptive adjustment, and then through an output layer. And outputting an additional power regulation instruction in combination with virtual inertia control, and outputting an optimized final additional power regulation instruction through an SOC-power-life collaborative model and an efficiency-life balance mechanism. The inertia evaluation precision and the response speed are improved, dynamic cooperation of inertia support and the energy storage state is achieved, and the operation safety and the service life of the energy storage system are guaranteed while inertia support is provided.