701results about "Conversion with reversal" patented technology

The present invention provides a power balance control method and device for a bidirectional PCS converter, the method comprising: dynamically compensating a PWM carrier counter according to the time difference between the interrupt timestamp sampled by an ADC and the count value of a PWM timer to obtain an optimal sampling moment of a PWM cycle; calculating a system resonant frequency according to an LCL filter network parameter, and dynamically modulating a switch delay time of a power tube according to its ratio to a switching frequency to obtain a switch delay voltage value; establishing a compensation channel according to the system resonant frequency, taking the switch delay voltage value as a feedforward compensation amount, and weightedly combining to obtain a PWM modulation signal; performing bandwidth limitation processing on a power calculation value at the optimal sampling moment according to the resonant frequency to obtain a power command value, and adjusting the PWM modulation signal accordingly to obtain a control amount of the converter charging and discharging power. The method eliminates the sampling timing deviation through dynamic compensation of a PWM carrier counter, thereby solving the system resonance problem of a bidirectional PCS converter.

The invention discloses a fan control method, an inverter and an energy storage system. The control method is used for the inverter, operation data of the inverter in different environments and when the inverter operates in multiple working modes are obtained, the operation data comprise temperature data, voltage data, power data and current data, and the temperature data are temperature data of multiple temperature detection points; respectively solving correlation coefficients of the temperature of the inverter and the external environment temperature, voltage and power of the inverter according to the operation data and a fitting algorithm; solving a target coefficient of the correlation coefficient and the rotating speed duty ratio of the fan according to the operation data; constructing a rotating speed duty ratio control equation about the fan according to the target coefficient; the target rotating speed of the fan is solved according to the rotating speed duty ratio control equation and the current operation data of the highest rotating speed inverter of the fan; controlling the fan to work according to the target rotating speed. Thus, intelligent control over the fan can be achieved under different working conditions, and energy waste is avoided while normal operation of the inverter is guaranteed.

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 bidirectional power flow control, and discloses an AC / DC charging pile bidirectional power flow control method, device and equipment, and the method comprises the steps: carrying out the detection and parameter collection of an AC / DC charging pile, a power converter and a grid connection point, and obtaining a charging pile system operation parameter set; trapezoidal voltage edge calculation is carried out on the switching process of the power converter, and the dead time compensation amount is superposed on a PWM control signal of the power converter to obtain a target PWM control signal; calculating to obtain an optimal PWM control sequence, and taking the first control quantity of the optimal PWM control sequence as the current control output; when it is detected that the direction of the power flow needs to be changed, the direct-current bus voltage of the power converter is controlled to be stabilized at a set value and then switched to the target working mode, and a new power output control quantity is obtained, the robustness of the alternating-current and direct-current charging pile is enhanced, the alternating-current and direct-current charging pile can adapt to the operation requirements under different working conditions, and the reliability of the charging pile is improved. And the fault rate of the AC / DC charging pile is reduced.

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.

In one embodiment, a method includes receiving DC bus voltage conditions of multiple AC to DC converters of an Input-Series-Output-Parallel power converter during a rectification stage; detecting a peak voltage of each of the DC bus of the multiple AC to DC converters has reached a first threshold voltage, and a Phase Loop Lock locked signal; upon detecting that the PLL locked signal, enabling a first voltage regulation to charge an AC to DC output of each of the multiple AC to DC converters to reach a first reference voltage; determining operating conditions including a load condition and an output voltage condition of multiple Dual Active Bridge (DAB) converters, and a monitored voltage of each of the multiple AC to DC converters; enabling a second voltage regulation of each of the multiple DAB converters to charge a DAB output to reach a second reference voltage based on the operating condition.

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 discloses an energy storage converter control method, which relates to the technical field of energy storage converters and is a method for monitoring the running state of an energy storage converter in real time and executing fault protection and / or state machine switching. The energy storage converter fault protection method comprises the following steps: reading a GPIO state or collecting a measurement value of each protection point, and comparing the measurement value with a fault threshold parameter to determine whether a fault occurs; when a fault occurs, a fault bit corresponding to the fault code register is activated, and the state machine is switched to a fault state and executes a fault protection program; the energy storage converter state machine switching method comprises the following steps: detecting whether a master control word register jumps or not compared with a previous period and executing corresponding operation; and executing corresponding control logic according to the current state of the state machine, wherein the states comprise a shutdown state, an alternating current pre-charging starting state, a standby state, an operation state, a fault state and a synchronous phase pulse test state. According to the method, the fault can be quickly responded, and the operation stability and safety of the PCS are ensured.

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 a hybrid supercapacitor energy storage type converter based on an H bridge and an operation method thereof, and the energy storage type converter comprises an upper bridge arm part and a lower bridge arm part. Each of the upper bridge arm part and the lower bridge arm part comprises three bridge arms, and each bridge arm is formed by connecting n H-bridge sub-modules and a bridge arm inductor in series; the upper bridge arm part is connected with a direct current bus, and the lower bridge arm part is connected with a grounding wire; the H-bridge sub-module comprises four switch elements and an energy storage unit, the energy storage unit is a hybrid super capacitor, the four switch elements form an H-bridge structure, and the hybrid super capacitor is connected to the two ends of the H-bridge structure in parallel. According to the invention, the dual functions of energy storage and current conversion in the AC-DC interconnected power grid can be realized under the cooperation of the control strategy, and various operation requirements in different scenes can be met.

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 discloses a power assembly and a liquid cooling converter, the power assembly comprises a capacitor module and a power module, in the capacitor module, a direct current capacitor pool comprises a first capacitor pool and a second capacitor pool, a capacitor busbar comprises a first busbar and a second busbar, and planes where the first busbar and the second busbar are located are intersected or parallel; in the power module, a mounting base body is provided with a first mounting surface and a second mounting surface which are deviated from each other, the first mounting surface is close to a first busbar, and the second mounting surface is close to a second busbar; the power tube group comprises a plurality of switching devices, and part of the switching devices are connected with the capacitor busbar through wiring components and are divided into first switches and second switches according to the connection relation with polar plates with different polarities on the capacitor busbar; each first switch is located on the first mounting surface and is connected with the first busbar through a wiring component, and each second switch is located on the second mounting surface and is connected with the second busbar through a wiring component. The structure of the power assembly can reduce stray inductance generated during operation.

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 embodiment of the invention relates to the technical field of electric power, in particular to a converter control circuit, a converter and a charging pile. The converter control circuit and the converter comprise the coupling unit, the power conversion unit, the bus unit and the control unit, one path of input of alternating current is converted into two paths or multiple paths of output by additionally arranging the coupling unit, in the multiple paths of output, current is isolated and equally divided, and the output current of the power conversion unit is improved. Meanwhile, the internal structure of the coupling unit suppresses the circulating current in the converter, and the circulating current loss in the power conversion unit is reduced. Furthermore, the power conversion unit is provided with a plurality of T-shaped three-level inversion units, so that a multi-level technology is realized, multi-voltage level is provided, and multi-level output can remarkably reduce harmonic content of output voltage and current, reduce current ripples and improve electric energy quality.

The invention discloses an intelligent noise reduction and heat dissipation system for a PCS converter, and relates to the technical field of converter operation control, and the system comprises the steps: collecting the operation data of the PCS converter, monitoring the temperature data in real time, and carrying out the heat dissipation control optimization based on the real-time temperature data; sound data during operation of the PCS converter are obtained, operation noise is analyzed, and noise reduction control is carried out through an intelligent audio driver; integrating heat dissipation control and noise reduction control, using an artificial intelligence algorithm to optimize operation parameters of the PCS converter, and evaluating an operation parameter effect; and applying and displaying the optimized operation parameters passing the evaluation, and synchronously generating an adjustment record and storing the adjustment record in a database. According to the method, dynamic optimization of heat dissipation of the PCS converter is realized, the problem of local overheating is effectively solved, accurate control of full-band noise is realized, and intelligent adjustment and effect evaluation of operating parameters of the converter are realized at the same time.

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.

The invention discloses a parameter control method for a bidirectional power conversion circuit with alternating current and direct current electric energy interchange, which relates to the technical field of circuit parameter control, and comprises the following steps: respectively carrying out electric energy conversion on an alternating current side and electric energy adjustment on a direct current side by adopting a topological structure in which a three-phase voltage source type converter and a direct current circuit bidirectional converter are connected in series; collecting parameters of the AC-DC bidirectional power converter in real time; switching among three working modes of rectification, inversion and shutdown is realized; the DC bus voltage is kept at a rated value when supply and demand in the DC subnet are balanced, and bidirectional flow of power is realized when supply and demand are unbalanced; performing coordinate transformation on the acquired voltage and current; and separating positive and negative sequence components of the voltage by using a second-order generalized integrator algorithm. By adopting a specific topological structure and utilizing the droop characteristic to realize working mode switching, the adaptability and the control precision of the bidirectional power converter in the alternating current and direct current hybrid micro-grid are improved.

The invention discloses a topology circuit of an isolated single-phase integrated vehicle-mounted charging system for an electric vehicle and a control method of the topology circuit. The topology circuit comprises an open-winding permanent magnet synchronous motor, a dual three-phase inverter, a power battery pack, a bus capacitor, a high-frequency transformer, a winding change-over switch K1, a winding change-over switch K2 and a bus change-over switch G1, through switching of the winding change-over switch K1, the winding change-over switch K2 and the bus change-over switch G1, the system works in a driving mode or a charging mode, and the system is controlled in combination with a driving control method and a charging control method. According to the invention, electrical isolation of the integrated vehicle-mounted charging system is realized without adding extra power devices and industrial frequency transformers, and the reliability and safety of charging are improved.

An energy conversion arrangement 100 for an electrolysis system 150 comprises an adjustable transformer 101 having a primary-side 102 connectable to an AC power-grid 103 via a point-of-common-coupling, a secondary-side 104, and a tap-changer 105, rectifier transformers 106,107 having primary-sides 108,109 configured to provide secondary-side voltages differing by pre-defined phase-shifts, thyristor rectifier units 114,115,116,117 forming a multipulse rectifier system 118 receiving the secondary-side voltages and providing DC current to electrolyser units 119,120,121,122, and a protection controller unit 133 for connecting / disconnecting the arrangement to / from the grid depending on comparisons of secondary-side voltages with corresponding secondary-side threshold voltages, wherein the multipulse rectifier system comprises synchronization control circuits 123,124,125,126 providing thyristor gate-pulses at firing angles synchronized with the secondary-side voltages, and wherein the corresponding secondary-side threshold voltages are determined by a nominal threshold-voltage in accordance with a grid code at the point-of-common-coupling and physical transformer parameters, adjusted depending on tap-changer position information 129.

The invention relates to an energy conversion arrangement (100) for an electrolysis system (150). It comprises an adjustable transformer (101) having a primary-side (102) connectable to a power-grid (103), and a secondary-side (104), a sensor device (105) sensing an alternating primary-side voltage at the adjustable transformer, rectifier-transformers (106,107) having primary- sides (108,109) connected to the adjustable transformer secondary-side and providing on their secondary-sides (110,111,112,113) alternating secondary-side voltages differing by pre-defined phase-shifts, and thyristor-rectifier units (114,115,116,117) forming a multipulse-rectifier-system (118) that receives the secondary-side voltages and provides DC- current to electrolyser units (119,120,121,122). The multipulse-rectifier-system comprises synchronization control circuits (123,124,125,126) providing thyristor-gate pulses to the thyristor-rectifier units at firing angles synchronized with synchronization-voltage signals (130) differing by the pre-defined phase-shifts and changed depending on electrolyser DC-current requests, wherein before application of the pre- defined phase-shifts, the synchronization-voltage signals (130) directly correspond to the alternating primary-side voltage sensed at the adjustable transformer primary-side (102).

The invention discloses a control circuit and method for a three-phase single-stage AC / DC converter, and belongs to the technical field of electric energy conversion, and the method comprises the steps: collecting the resonance current in a DC / DC resonance circuit, calculating the integral value of the resonance current, outputting a signal after modulation, and determining the drive logic of a switch in the DC / DC resonance circuit. According to the control circuit and method of the three-phase single-stage AC / DC converter, energy transmitted by the resonant cavity can be directly controlled, the resonance condition of each switching period element does not need to be considered, parameter design is simple, the dynamic performance of a system can be improved, and the control speed of three-phase current can be increased.

A power converter circuit includes: a solid state switch connected between a first node and a second node; a capacitor coupled between the second node and a ground reference node; and a control system that monitors a voltage level across the capacitor, and (i) turns on the solid state switch during a positive half-cycle of an AC electrical waveform coupled to the first node to cause the capacitor to be charged when the voltage level across the capacitor is less than a maximum DC voltage level, and (ii) turns off the solid state switch during a negative half-cycle of an AC electrical waveform coupled to the second node to cause the capacitor to be charged when the voltage level across the capacitor is less than a maximum DC voltage level. And (ii) turning off the solid state switch during the positive half cycle of the AC electrical waveform in response to determining that the voltage level across the capacitor has reached the maximum DC voltage level. The control system is configured to generate a regulated threshold voltage for the solid state switch during a negative half-cycle of the AC electrical waveform while maintaining the solid state switch in an off state during the negative half-cycle.

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 invention relates to a circuit (1), comprising an input line (2), an output line (3), and a main switched-mode converter (4) that has an input connected to the input line and an output connected to the output line and produces operating harmonics, the circuit comprising at least one additional DC / AC converter (5) mounted in parallel with the main converter and arranged to inject, onto the one of the two lines that carries the sine-wave signal and in synchronisation with the sine wave, an additional signal depending on the operating harmonics of the main converter, the additional converter comprising at least one switching stage (7) consisting of a broadband semiconductor.

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.

The invention provides a light storage system and a controlled charging and discharging control method, at least two energy storage units are respectively connected and are accessed to a direct current bus through an energy storage discharging path and an energy storage charging path, a controller monitors the electric quantity SOC value in a first battery energy storage unit and a second battery energy storage unit in real time, and when the electric quantity SOC value of any one battery energy storage unit is determined, the battery energy storage unit is switched to the first battery energy storage unit and the second battery energy storage unit. When the electric quantity value is equal to or exceeds the set electric quantity SOC value, the charging and discharging states of the two battery energy storage units are adjusted and switched; rapid, safe and efficient controlled charging and discharging are realized, and the service life of battery energy storage is prolonged; according to the invention, the defects in the prior art that the photovoltaic module and the energy storage module are connected in parallel on the same bus, and the condition that the photovoltaic is greater than or smaller than the load occurs randomly, so that the battery is repeatedly charged and discharged and is not controlled are overcome; and power control cannot be accurately carried out.