362results about "Conversion with reversal" patented technology

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 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 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.

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 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.

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.

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.

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.

The invention relates to a stable control method and a stable control system for accessing a network construction type heterogeneous power supply to a direct current system, belongs to the technical field of power system control, and solves the problem of serious active power vacancy when an alternating current tie line of an existing multi-source access direct current sending end system fails. The method comprises the steps that energy flow paths among subsystems in the system are analyzed to identify key control links causing instability of the system and orthogonal interaction energy of the key control links, and the orthogonal interaction energy is an interaction energy item which has the largest influence on the stability of the system in interaction energy among modules of the subsystems; based on a minimization principle of total stored energy of the system, coordinating and adjusting a doubly-fed fan active instruction, a direct current system current instruction and an energy storage active instruction in real time; keeping a negative value according to the total interaction energy of the system to compensate the orthogonal interaction energy among the subsystems; and according to the state feedback signal, the active power instruction of each subsystem is dynamically adjusted in combination with the control switching logic. The adaptive capacity and the dynamic recovery performance are improved, and accurate matching and quick response to various fault working conditions are achieved.

The invention discloses a control method and system for an energy storage converter, and the method comprises the steps: enabling a centralized controller to carry out the droop control and centralized secondary control in a grid-connected state; in an off-network state, closed-loop control and load power distribution are carried out through the virtual synchronous machine; after a power grid fault is detected, controlling each energy storage converter to output reactive component zero clearing, disconnecting power grid connection and switching to an off-grid mode; after detecting that the power grid returns to normal, enabling the output of each energy storage converter to be synchronous with the voltage and phase of the power grid through pre-synchronization control, closing the power grid connection, and switching to a grid-connected mode; and when a communication fault or the energy storage converter is detected to be offline, adjusting the power distribution of the energy storage converter in normal operation, after recovery, enabling the power distribution to be consistent with the common bus parameters through pre-synchronization, and then redistributing the power. According to the invention, power dynamic optimization distribution and bus power grid stable synchronization during grid connection are realized, grid-connected and off-grid switching is free of impact, and the operation stability and the power supply quality of the micro-grid are remarkably improved.

The invention discloses a multi-terminal flexible direct current system coordination control method and device, a multi-terminal flexible direct current system comprises a plurality of flexible interconnection devices, each flexible interconnection device is provided with an interconnection agent, and the adjacent flexible interconnection devices establish communication through the interconnection agents. The method comprises the following steps: outputting a current optimal droop coefficient and adjusting the direct current side output current of the current flexible interconnection equipment based on a droop coefficient optimization model pre-constructed in the current flexible interconnection equipment in combination with the direct current side output current, the direct current side output voltage and the alternating current side output power of the current flexible interconnection equipment, obtaining a direct current side output voltage reference value of the current flexible interconnection equipment by combining a direct current side rated voltage value of the current flexible interconnection equipment; through the proportional-integral controller, a power control instruction is output, coordination control over the current flexible interconnection equipment is completed, the influence of voltage deviation and uneven current shunting is reduced, more accurate voltage control and power distribution are achieved, and the overall performance of the system is improved.

The invention discloses a power modulation method, system and device for an isolated single-phase DC-AC converter and a medium, and the method comprises the steps: firstly, carrying out the sampling of input and output voltage and current, and obtaining the size of transmission power; then determining the soft switching current of the primary and secondary side switching tubes; determining inner and outer phase shift angles according to the soft switching threshold current; calculating a switching frequency based on the transmission power; determining dead zone time of a primary side bridge arm and a secondary side bridge arm according to the phase shift angle, the switching frequency and a soft switching constraint condition; and finally generating a PWM driving signal. According to the invention, ZVS soft switching of all switching tubes on the DC side and the AC side can be realized, loss caused by operation of the switching tubes in the fourth quadrant in the dead zone time is optimized, the working operation efficiency of the converter is improved, the power control strategy is simple, and the method has high practical application value.

The invention discloses an energy storage converter cabinet with double DC / DC converters. The energy storage converter cabinet comprises a cabinet body, a bidirectional DC / AC converter, a first DC / DC converter, a second DC / DC converter, a common DC bus and a central controller, the AC side of the bidirectional DC / AC converter is connected with a local AC load and / or a power grid, and the DC side is connected with a common DC bus; the low-voltage end of the first DC / DC converter is connected with the battery pack, and the high-voltage end is connected with the common DC The first end of the second DC / DC converter is connected with the photovoltaic array, and the second end is connected with the common DC bus; the central controller is connected with the bidirectional DC / AC converter, the first DC / DC converter and the second DC / DC converter; according to the power grid instruction, the battery state and the photovoltaic power generation condition, the bidirectional DC / AC converter, the first DC / DC converter and the second DC / DC converter are controlled, and photovoltaic power, battery power and power grid power are dispatched in real time.

The invention belongs to the technical field of energy storage, and particularly relates to a multi-scale adaptive DC bus balance control method of an energy storage converter. The method comprises the steps that 1, an upper-layer coordination controller obtains direct current bus voltage and load power direction labels of all levels, and initializes a historical switch sequence signature library and a resonance fingerprint table; step 2, a lower-layer rapid controller takes the alignment state view as an initial state, forms a candidate switch action set according to cascade topology and safety interlocking, and generates a prohibition list; meanwhile, writing the new signature back to the historical switch sequence signature library and updating the resonance fingerprint table; and step 3, the upper-layer coordination controller repositions the dielectric reference voltage according to second-level fitting distribution and resonance fingerprint table statistics, and issues the updated bypass table and suppression table to the lower-layer rapid controller to complete interlayer closed-loop coordination. According to the invention, the rapidity, stability and adaptivity of DC bus voltage balance can be effectively improved.

An electrical converter may include AC terminals, a first and second DC terminal, and converter modules. Each of the converter modules has an AC node. The second DC terminal forms a common node of the converter modules. A connection between the AC nodes of the converter modules and the AC terminals is reconfigurable allowing the electrical converter to operate according to a first mode of operation converting between a first AC signal having a first plurality of phase voltages and the DC signal, in which the converter modules are grouped in first groups, and according to a second mode of operation converting between a second AC signal having a single-phase voltage and the DC signal, in which the converter modules are rearranged in second groups. The electrical converter is configured to operate multiple converter modules assigned to a same group of the first groups and the second groups in parallel.

An energy conversion device 100 for an electrolysis system (150) comprises: an adjustable transformer (101) having a primary side (102) connectable to an AC grid (103) via a point of common coupling, a secondary side (104) and a tap switch (105); a rectifier transformer (106, 107) having a primary side (108, 109) configured to provide a secondary side voltage differing by a predetermined phase shift; a thyristor rectifier unit (114, 115, 116, 117) forming a multi-pulse rectifier system (118) that receives the secondary side voltage and provides a DC current to the electrolyser unit (119, 120, 121, 122); and a protection controller unit 133 for connecting / disconnecting the device to / from the power grid as a function of a comparison of the secondary-side voltage to a corresponding secondary-side threshold voltage, where the multi-pulse rectifier system comprises a synchronization control circuit (123, 124, 125, 126) providing thyristor gate pulses at an emission angle synchronized with the secondary-side voltage, and a protection controller unit 133 for connecting / disconnecting the device to / from the power grid as a function of a comparison of the secondary-side voltage to a corresponding secondary-side threshold voltage. And wherein the respective secondary-side threshold voltage is determined from a nominal threshold voltage specified by a grid guideline at the point of common coupling and a physical transformer parameter adjusted according to tap switch position information (129).

The invention discloses a bidirectional DC-AC converter control method considering a soft switching condition and current optimization. According to the invention, the switching loss of the converter is reduced by optimizing the phase shift angle and the switching condition of the converter, and the energy transmission efficiency is optimized by minimizing the effective value of the current, so that the performance of the whole sodium battery energy storage system is improved. Specifically, based on the relation between the excitation inductance Lm and the current effective value Iprms, the phase shift angle of the converter is accurately controlled, the current transmission efficiency is optimized, and it is ensured that the zero-voltage switching condition of a primary side bridge arm and a secondary side bridge arm can be achieved in the working process, so that the loss of the converter is remarkably reduced, and the energy conversion efficiency is improved.

The invention discloses a novel vehicle-mounted high-voltage inverter power supply system, which is characterized by comprising a bidirectional DC / DC module, a bidirectional DC / AC inverter, a control unit and a filtering unit, the control unit is connected with the filtering unit through the bidirectional DC / DC module. The control unit is connected with the filtering unit through the bidirectional DC / AC inverter. And the bidirectional DC / DC module is electrically connected with the bidirectional DC / AC inverter.

This invention discloses an inductor module and an inverter, including an inductor component. The inductor component includes an inductor housing, a wire harness connector on one side of the inductor housing, a protective plate inside the inductor housing, and an inductor module mounted on the protective plate. Protective supports that slide on the surface of the protective plate are provided on both sides of the inductor module. At least one wedge-shaped block is fixed to the side of each protective support. By configuring the inductor housing, protective plate, inductor module, protective supports, wedge-shaped block, cover, buffer spring, and wedge-shaped block, the inductor housing protects the inductor module, while the protective plate and protective supports buffer the inductor module, reducing the impact of external impacts and compression. Simultaneously, the downward movement of the cover drives the wedge-shaped block to move synchronously, which in turn drives the wedge-shaped block to move, bringing the two protective supports closer together to fix the inductor module. The buffer spring further enhances the buffering effect.

A power supply circuit and an energy storage device are provided. The power supply circuit includes a DC / DC conversion module, a first AC / DC conversion module, a second AC / DC conversion module, an alternating current input interface, a first alternating current output interface, and a second alternating current output interface. A first end of the first AC / DC conversion module is connected to a battery module through the DC / DC conversion module, a first end of the second AC / DC conversion module is connected to the first end of the first AC / DC conversion module through a direct current bus, the first alternating current output interface is connected to a second end of the first AC / DC conversion module and a first terminal of the alternating current input interface, the second alternating current output interface is connected to a second end of the second AC / DC conversion module, both the first AC / DC conversion module and the second AC / DC conversion module may operate in a rectification mode or an inversion mode, and the DC / DC conversion module operates in a discharging mode or a charging mode.

Charging device comprising: a battery (106) suitable and configured to store DC voltage; first and second motors (101, 102) suitable and configured to operate as a motor or a generator; first and second inverters (103, 104) suitable and configured to operate the first and second motors (101, 102); a voltage transformer (105) suitable and configured to increase the DC voltage of the battery (106) to supply it to the first and second inverters (103, 104) and to increase the DC voltage of the inverter to supply it to the battery (106); and a charging controller (200) suitable and configured to operate the first and second inverters (103, 104) as a booster or generator.to operate voltage amplifiers or to operate the voltage transformer (105) as a step-down converter, according to a voltage which is input via a neutral point of the first and second motors (101, 102) and the voltage of the battery (106), wherein the charging control element (200) is configured to switch off the voltage transformer (105) so that the voltage which is increased by the first inverter (103) or the second inverter (104) charges the battery (106) when the voltage which is input via the neutral point of the first and second motors (101, 102) is less than the battery voltage.

The embodiment of the present disclosure discloses a modular bidirectional current conversion system and a zero-crossing control method. The control method comprises: in response to at least part of the first module in the level conversion module switching from processing the first half cycle of the modulation signal to processing the second half cycle of the modulation signal in the first cycle, and at least part of the second module switching from processing the first half cycle of the modulation signal to processing the second half cycle of the modulation signal in the second cycle, outputting a compensation control pulse to at least one target switch in the plurality of switches of the second module in the second cycle to turn on the target switch in the corresponding time length of the compensation control pulse; wherein the second cycle is a modulation cycle located after the first cycle; the positive and negative polarities of the first half cycle and the second half cycle are different; the compensation control pulse at least partially overlaps with the control pulse of the target switch corresponding to the first module in the second cycle; the processing of the modulation signal by the level conversion module comprises: inverter processing and / or rectifier processing.

The invention discloses a self-adaptive control method and system for an outdoor energy storage converter, and the method comprises the steps: a current inner loop control process: carrying out the decoupling control of a current inner loop of the outdoor energy storage converter through a feedforward decoupling control strategy based on a dq model of the outdoor energy storage converter; in the voltage outer loop control process, adjustable parameters of the outdoor energy storage converter are obtained, the adaptive law of the outdoor energy storage converter is obtained through a Narendra stable adaptive control algorithm, and the influence of parameter changes of a controlled object on a control result is counteracted by continuously changing the adjustable parameters; in the smooth switching control process, the output voltage of the outdoor energy storage converter is adjusted by obtaining the voltage frequency, amplitude and phase information of the power grid side and / or the load side according to the current inner loop control process and the voltage outer loop control process, and grid-connected and off-grid switching is conducted on the outdoor energy storage converter; according to the invention, the stable operation of the outdoor energy storage converter is ensured, and the system robustness is enhanced.

This invention proposes a method and system for coordinated charging and discharging of electric vehicles based on energy storage substations. This method is used to solve the problems of transformer overload and three-phase load imbalance during charging and discharging. The core steps include: Step 1: The centralized controller acquires real-time substation operation data and uploads it to the cloud service controller for analysis; Step 2: Determines whether load imbalance and transformer overload exist; Step 3: When load imbalance and substation transformer overload are detected, a substation scheduling and control model is established to optimize the charging and discharging loads of energy storage batteries, AC charging piles, and DC charging piles; Step 4: Finds the optimal load switching scheme based on the model; Step 5: Evaluates the load balance improvement effect; If the load imbalance exceeds the adjustment range or exceeds the transformer load rate threshold, the DC charging pile can be connected to the 10kV incoming line via the second branch boost inverter where the inverter is located.