565 results about "Power electronics converters" patented technology

The invention discloses a driving control method of a DAB converter and related equipment, and relates to the technical field of power electronic converter control, and the method comprises the steps: calculating a voltage transformation ratio based on an input voltage and an output voltage through a current stress adjustment module, and calculating an output power based on the output voltage and an output current, substituting the voltage transformation ratio and the output power into a current stress adaptive minimization algorithm to solve an internal phase shift angle; meanwhile, through a PI controller, an external shift phase angle is adjusted based on a difference value between the instruction voltage and the output voltage; outputting the inner phase shift angle and the outer phase shift angle to a PWM modulation generator to generate a switching tube driving signal; the DAB converter is controlled by the driving signal to realize rated voltage output and current stress minimization, so that the efficiency and reliability of the converter are improved.

The invention provides an impedance scanning device based on network side voltage dynamic compensation under a three-phase voltage imbalance working condition, and relates to the technical field of new energy station power electronic converter topology and control, the device comprises a three-phase rectifier, a direct current bus capacitor, an inverter, a voltage compensation device, a frequency sweeping device, a circuit breaker and a series transformer part, the three-phase rectifier is connected in series with inverters of the voltage compensation device and the frequency sweep device, a secondary side of a series transformer of the voltage compensation device is connected in series with a network side, a secondary side of a series transformer of the frequency sweep device is connected in series with a grid-connected point, and a primary side of the series transformer is connected to the inverters and is coupled to a secondary side of the series transformer; according to the device, the power grid side voltage is rectified through the voltage compensation unit and is compensated to the grid side after being subjected to single-stage inversion transformation, voltage compensation is achieved through the energy of a power grid when the voltage is unbalanced, and an external energy source or an interference source does not need to be introduced. After compensation, the accuracy of the frequency sweeping result is obviously improved.

The invention relates to a multi-energy collaborative intelligent micro-grid control method, device and equipment and a medium. According to the method, a micro-grid frequency signal is collected in real time, the change rate of the micro-grid frequency signal is calculated, the inertia requirement of a system is accurately evaluated, the maximum virtual inertia capable of being provided by each unit is dynamically calculated in combination with the physical characteristics and operation constraints of each energy unit, and the system requirement and the unit capacity are dynamically matched through grey correlation analysis to generate an optimal distribution scheme. And then the special control models of all the units are driven to generate differentiated power regulation instructions, and finally power support is cooperatively executed through the power electronic converter, so that accurate matching and efficient cooperation of multi-energy virtual inertia capability are realized, the frequency stability of a high-proportion new energy power grid is remarkably enhanced, and the system performance is improved. The problems of resource allocation mismatch, poor control adaptability and the like in a traditional method are effectively avoided, and the dynamic safety of the system is guaranteed under the complex operation working condition.

The invention relates to a current reference quantity feed-forward compensation control method and system. The control method comprises the following steps: determining a current inductive current reference value of a triangular wave type power electronic converter; obtaining a PI control component based on the current inductive current reference value; subtracting the current inductive current reference value from the inductive current reference value of the previous period to obtain an inductive current reference value variable quantity; feedforward operation is carried out according to the inductance current reference value variable quantity and the working condition parameters of the triangular wave type power electronic converter, and a feedforward compensation component is obtained; and summing the PI control component and the feed-forward compensation component to generate a duty ratio so as to realize control of the triangular wave type power electronic converter. According to the current reference quantity feed-forward compensation control method and system provided by the invention, the tracking speed of the triangular wave type power electronic converter can be improved on the premise of not influencing the control precision of the triangular wave type power electronic converter.

The invention discloses a cooperative control system for an input-series output-parallel dual-active-bridge inverter, and relates to the technical field of power electronic converter control, an input voltage equalizing control IVSC loop is set for m-1 DAB sub-modules, and input voltage equalization of the DAB sub-modules is realized by adjusting phase shift angles of the sub-modules; an output voltage control OVC loop is set for the output DC bus voltage of the whole ISOP-DAB system to stabilize the DC bus voltage, a PIR controller is adopted in the OVC loop, and the resonant frequency is set to be twice of the fundamental frequency of the AC side, so that selective high gain is provided at the position, the frequency doubling fluctuation of the DC bus voltage is inhibited, and the frequency doubling fluctuation of the DC bus voltage is inhibited. According to the method and the device, the regulation quantity of the IVSC loop and the regulation quantity of the OVC loop are superposed to carry out cooperative control, so that the effective suppression of the frequency doubling fluctuation of the DC bus voltage and the automatic equalization of the power of each module are accurately realized on the premise of not increasing the hardware complexity.

The invention relates to the technical field of power electronic converters, and discloses a grid-connected inverter multi-parameter online setting method, system and device and a medium. The method comprises the following steps: establishing a circuit simulation model of the grid-connected inverter; output currents of the grid-connected inverter under different power grid impedance working conditions are obtained through the circuit simulation model, and target control parameters of the grid-connected inverter under different power grid impedance working conditions are obtained through iterative search by adopting a particle swarm optimization algorithm through the circuit simulation model; performing off-line training on the parameter reasoning model through the output current of the grid-connected inverter under different power grid impedance working conditions and the target control parameter under the corresponding power grid impedance working condition; acquiring an output current of the grid-connected inverter in real time, and inputting the output current acquired in real time into the trained parameter reasoning model to obtain a corresponding target control parameter; and on-line setting is performed on the control parameters of the grid-connected inverter through the target control parameters output by the parameter reasoning model, so that rapid setting can be realized.

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.

Described herein is a method of operating a power electronic converter device for an electrical power conversion system. The power electronic converter device includes a converter circuit including an input side, an output side, a first converter, and at least one second converter. The second converter includes at least one floating cell with a DC intermediate circuit and semiconductor devices. The method includes: switching the semiconductor devices of the floating cell at switching instants determined with optimized pulse patterns or carrier-based pulse width modulation; determining a fundamental voltage component for the floating cell; and generating the fundamental voltage component in the actual voltage of the floating cell by modifying the switching instants, such that a voltage VC AF of the DC intermediate circuit is lying in a given reference voltage range for balancing the DC intermediate circuit of the floating cell.

The invention belongs to the field of power electronic converter control and design, and discloses a carrier modulation method and system for achieving accurate control over the neutral-point potential of a three-level inverter. The neutral-point voltage is kept in a relatively balanced state by detecting and correcting the voltage difference of an upper capacitor and a lower capacitor on the direct current side in time; and the distortion of the output voltage at the alternating current side caused by large fluctuation of the neutral-point potential is reduced or avoided. A midpoint potential correction link is introduced while the advantages of a conventional SVM or carrier modulation are not damaged; and when the neutral-point potential deviates, the zero-sequence voltage is automatically injected or a proper switching vector sequence is selected to compensate, suppress harmonic waves and reduce the distortion degree, so that the waveform quality of the output voltage is improved.

The invention discloses a two-degree-of-freedom prediction control method of an LCL filtering type three-phase grid-connected inverter system, and belongs to the field of power electronic converter control. A prediction control reference instruction is obtained by sampling parameters of inverter side current, capacitor voltage, network side current and power grid voltage at the moment k, and a continuous and discrete model of an LCL filtering type three-phase grid-connected inverter system is established; designing a control function based on a grid-side current reference tracking error and a gradient thereof, and establishing a prediction model; constructing a prediction cost function based on a control function, and obtaining a prediction control reference instruction by using a minimum value of the prediction cost function; and determining an optimal voltage vector and an action duty ratio according to the prediction control reference instruction, generating a control pulse signal according to a symmetrical five-section pulse mode, and acting on each switching tube in the inverter to realize prediction control of the LCL filtering type three-phase grid-connected inverter system. The method is simple in step, convenient to use, constant in switching frequency and good in stability.

The invention discloses a control method for fast switching from heavy load to light load of an LCC resonant converter, and relates to the technical field of power electronic converter control. The method comprises the following steps: S1, building an LCC resonant converter; s2, monitoring load current in real time, and identifying a load abrupt change signal; s3, calculating coordinates of an intersection point of the current working point and the target light load trajectory according to the state trajectory model; and S4, triggering a switch tube advanced turn-off instruction at the switching point, and switching the driving system to a light load mode along the transition track. According to the invention, a specific switching period is introduced during frequency switching, so that the resonant converter can be rapidly and stably switched from a heavy-load working mode to a light-load working mode. According to the switching mode, the voltage overshoot phenomenon during load sudden change can be effectively suppressed, the response time can be shortened, and the dynamic response performance of the resonant converter can be greatly improved. Compared with a traditional scheme, the system stability is improved, and the power loss is reduced.

The invention discloses a variable frequency phase shift control DAB type single-stage inverter reactive power control method, system and device and a medium, and belongs to the technical field of power electronic converter control, and the method comprises the steps: setting a reactive power instruction as zero; when the reactive power instruction changes, the active power instruction and the reactive power instruction at the current moment are decomposed into a direct-axis current reference value and a quadrature-axis current reference value respectively; comparing the reference value with an actual sampling value, calculating an error compensation amount by using a PI controller, and determining the amplitude and phase of the AC side current according to the compensation amount; according to the amplitude and the phase of the voltage and the current, a DAB frequency conversion phase shift control curve is calculated; and generating a PWM (Pulse Width Modulation) signal according to the frequency conversion phase shift control curve obtained by calculation, wherein the PWM signal is used for driving a DAB inverter to carry out power transmission. According to the invention, on the premise that no extra hardware circuit is introduced, dynamic adjustment and accurate control of the instantaneous reactive power of the AC output side can be realized.

A device and method for managing power transmission to a power grid from a Hybrid Grid Connected System (HGCS) is presented. The HGCS includes a plurality of energy resources, including of solar photovoltaic cells (PV), wind power generation, a battery energy storage system (BESS) and a fuel cell system paired with an electrolyzer. Energy sources are connected by a DC-link to a power electronic converter which supplies power to the power grid. A controller is configured to calculate the total power, maximize transmission of power to the power grid from the primary sources, supply the net power to the power grid from the fuel cell system and use the power generated by the PV system and the wind power system for charging the BESS and powering the electrolyzer system based on the relative state of charge of the BESS and the voltage of the DC-link.

The invention belongs to the technical field of high-frequency planar transformers, and relates to a butterfly-shaped planar transformer with a twisted primary side and an anti-coupling secondary side and a switching power supply. The winding comprises a primary winding and a secondary winding; the magnetic core is of a four-core-column butterfly-shaped structure, and the secondary winding and the primary winding respectively surround two core columns in the center of the magnetic core; the winding directions of the secondary winding current around the two middle columns of the magnetic core are the same; the primary winding is positively coupled with one secondary winding and reversely coupled with the other secondary winding; according to the two-core-column matrix type transformer, the problem that magnetic saturation is caused by the magnetic flux of direct-current magnetic bias at the connecting part of the transformer is solved, so that the two-core-column matrix type transformer can be applied to a switching power supply with direct-current magnetic bias and a power electronic converter; compared with a traditional scheme, the efficiency and the power density of the transformer are remarkably improved.

The invention belongs to the technical field of power electronic converter control, and discloses a control method of a grid-forming type doubly-fed asynchronous wind power generation system with power control capability, which comprises a control process of a rotor-side converter and a control process of a grid-side converter, and is characterized in that the rotor-side converter forms a grid-forming type characteristic at a motor stator winding port, and the grid-side converter forms a grid-forming type characteristic at a motor stator winding port; the energy injected into the direct current bus capacitor is controlled; the grid-side converter maintains the input and output energy balance of the DC bus capacitor so as to control the voltage of the DC bus capacitor to be constant; the control process of the rotor side converter comprises a frequency support control loop, a power control loop, a voltage and current inner loop and pulse width modulation control, and the control process of the grid side converter comprises a direct current voltage control loop, a reactive power control loop, an alternating current control loop and pulse width modulation control. According to the invention, the capability of controlling the output power can be provided while the network construction type power dynamic index is realized.

A electrical power system comprises: an electrical machine operable to output AC; a DC electrical network; a power electronics converter connected between the AC output of the electrical machine and the DC electrical network and including a plurality of transistors and associated diodes connected in parallel with the transistors; and a controller configured to control switching of the transistors of the converter so that, during normal operation of the electrical power system, the converter rectifies the AC output of the electrical machine to supply the DC electrical network with DC electrical power. The controller is further configured, responsive to a determination to the effect there is a fault in the DC electrical network, to control a voltage source, to inject a voltage to bias the diodes of the converter, and to control the switching of the transistors to control a level of current supplied to the faulted DC electrical network.

The invention discloses a power distribution network voltage double-layer optimization method and device, and belongs to the technical field of power system control. A plurality of nodes of the power distribution network system are connected with a photovoltaic power generation system or a capacitor bank. The method comprises the following steps: acquiring input data of the plurality of nodes in the power distribution network system; optimizing the mechanical tap gear of the transformer and the switching group number of the capacitor group by taking the minimum line loss as the target and taking the condition that the voltage of the power distribution network system is not out of limit as the constraint; according to the mechanical tap gear and the switching group number of the capacitor bank, with the highest new energy consumption rate, the minimum operation cost and the minimum line loss as targets, the compensation capacity, the energy storage charging and discharging power and the compensation transformation ratio of the power electronic converter of the STATCOM are optimized; and configuring the power distribution network system under the condition that the voltage of the power distribution network system does not exceed the limit. According to the method, the voltage out-of-limit problem caused by photovoltaic backward flow is solved, and the voltage quality of the power distribution network is improved.

The invention discloses an energy storage converter predictive current control method based on data driving model self-learning, and belongs to the technical field of power electronic converter control. The energy storage converter is a half-bridge bidirectional DC-DC converter, and the method comprises the following steps: collecting the state quantity of the energy storage converter through a sensor in each control period, forming a data driving prediction model constructed by an input vector input neural network online parameter identification module, and outputting an initial duty ratio prediction value; constructing a value function, performing online optimization on an initial value through a gradient descent method to obtain a final optimal duty ratio, and simplifying a scene to directly use the initial value; comparing the optimal duty ratio with a carrier wave to generate a PWM (Pulse Width Modulation) signal to drive a power switch tube; actual inductive current is collected, an ideal duty ratio enabling the value function to be minimum is reversely solved to serve as a supervision signal, and the model weight is trained and updated online through a sample. The technical problem that traditional continuous set model predictive control depends on an accurate mathematical model is solved.

The invention relates to the technical field of intelligent control of power electronic converters and induction heating, in particular to an intelligent control system of a medium-frequency power supply, which comprises a data acquisition module configured to acquire end-side voltage data and end-side current data of power conversion hardware in real time; the feature extraction module is configured to receive the end-side voltage data and the end-side current data and extract broadband waveform distortion features; the state evaluation module is configured to receive the broadband waveform distortion characteristics and calculate a model trust entropy value based on the broadband waveform distortion characteristics; the self-adaptive control module is configured to receive the model trust entropy value, trigger a second control mode to generate a second switch instruction and send the second switch instruction to the power conversion hardware; the model trust entropy represents a prediction deviation degree of a preset robust control model to the current real physical state of the power conversion hardware; according to the invention, the problem of insufficient perception of fine-grained service parameters in the background technology is solved.

Examples described herein provide a circuit that includes a power electronics converter disposed in a vehicle, the power electronics converter to receive alternating current (AC) electrical power from an AC grid source and to provide AC electrical power to an AC load external to the vehicle. The power electronics converter includes an AC-AC converter that includes a rectifier and an inverter, the rectifier being electrically connected to the inverter by a direct current (DC) link. The circuit further includes an on-board charging module electrically connected to the power electronics converter and a battery disposed in the vehicle. The power electronics converter provides vehicle-to-load functionality by providing, to the AC load, AC electric power as an output of at least one of a 120 Vac output or a 240 Vac output.

The invention provides a power electronic converter multi-task hardware-in-the-loop test method and system based on electric heating real-time simulation. The method comprises the following steps: establishing a power electronic converter circuit model; constructing a power semiconductor thermal network model; establishing an electric heating real-time simulation model of the power electronic converter through a loss calculation module and an electric parameter correction module; solving an electric heating real-time simulation model of the power electronic converter; and establishing a multi-task hardware-in-the-loop test platform based on the electric heating real-time simulation model, and carrying out multi-task hardware-in-the-loop test. Different from a traditional hardware-in-loop test, the method can perform multi-task hardware-in-loop test on various strategies of closed-loop control, thermal management, device protection, fault prediction, health management, fault-tolerant control and the like of the power electronic converter based on the electric heating real-time simulation model of the power electronic converter. According to the invention, comprehensive, efficient, safe and low-cost testing can be carried out on the converter, and the research and development period of the power electronic converter is shortened.

The invention relates to the technical field of power electronic converter control, in particular to an LLC converter dynamic response capability optimization control method based on a neural network, and the method comprises the steps: building an LLC converter dynamic response mathematical model based on a frequency conversion modulation strategy; optimizing the dynamic response process of the LLC converter during load switching by selecting a differential evolution algorithm and combining the mathematical model, and collecting k groups of frequency data with optimal LLC dynamic performance during load switching; training a pre-constructed neural network model by taking the collected k groups of frequency data with optimal LLC dynamic performance for load switching as training data; and applying the trained neural network model to an LLC converter controller to realize optimization of a dynamic response process. According to the invention, the LLC converter has better dynamic response capability in the load switching process, so that the LLC converter can stably and quickly reach a new steady state.

The invention provides a wind turbine generator grid-connected broadband oscillation power grid simulation method, system and device and a medium, and belongs to the technical field of power system new energy grid connection, and the method comprises the steps: carrying out the frequency sweeping of a network side part of a physical wind turbine generator grid-connected system, and obtaining a full-band dq impedance characteristic curve; performing segmentation processing on the full-band dq impedance characteristic curve according to frequency; performing rational function fitting on the dq impedance characteristic curve of each frequency band by using a least square method, and enabling the network side part of the physical wind turbine generator grid-connected system to be equivalent to an RLC branch; constructing an impedance circuit, a main circuit and a signal processing module for each frequency band, and completing the construction of a broadband oscillation working condition simulation circuit; and the broadband impedance dynamic characteristics of the physical wind turbine generator grid-connected system are reproduced through the broadband oscillation working condition simulation circuit, so that the grid-connected stability of the physical wind turbine generator is detected. According to the invention, the simulation precision of the power grid simulator based on the power electronic converter topology is prevented from being limited by switching frequency and control precision.

The invention discloses an active-disturbance-rejection control method and system for a four-port magnetic network electric energy router, and belongs to the technical field of isolated power electronic converters. The method is based on a proportional-integral control method of a decoupling matrix, and is combined with an adaptive disturbance suppression state observer to be used in the magnetic network electric energy router, so that the active disturbance rejection of the system is improved, and particularly, the common problem of parameter mismatching in a traditional decoupling control method is solved. The method comprises the following steps: step 1, establishing a simple and effective power decoupling matrix, thereby realizing efficient power decoupling among a plurality of ports, effectively reducing mutual interference among the ports, and ensuring that control of each port can be independent and stable; and 2, introducing an adaptive disturbance suppression state observer into a feedback system, so that the system can estimate and compensate errors caused by parameter uncertainty or noise interference in real time, and the active disturbance rejection of the system under dynamic and complex working conditions is greatly improved.

The invention relates to the technical field of power electronics, discloses a management method of an intelligent power electronic converter, and aims to solve the problem that in the prior art, operation performance and long-term reliability cannot be collaboratively optimized. According to the method, voltage, current, temperature and vibration data are collected in real time through a multi-mode sensor, and a high-fidelity digital twinborn model fusing electromagnetism, thermodynamics and component aging mechanisms is constructed and calibrated online; based on the model, a multi-objective optimization function including efficiency, electric energy quality, residual life and accumulated damage is established in a prediction time domain, a Pareto optimal control parameter set is solved by adopting a multi-objective evolutionary algorithm, and an optimal solution is selected according to a dynamic utility function to generate a driving instruction. The system comprises a state sensing module, a digital twin modeling module, a prediction optimization module, a strategy decision module and a driving execution module, full-dimension self-adaptive closed-loop management of performance and service life is achieved, and the intelligent level, economical efficiency and reliability of the converter are remarkably improved.

A power electronics converter including: an input terminal; first and second DC output terminals; a branch having first and second semiconductor switches connected in series between the first and second DC output terminals, the input terminal connected to a node between the first and second semiconductor switches; a DC link capacitor connected between the first and second DC output terminals; a differential current sensor arranged to measure a differential current signal through the first or second DC terminals; and a controller configured to provide switching signals to each of the first and second switches of the power electronics converter, wherein the controller is further configured to detect a fault in a DC network connected between the first and second DC output terminals upon detection of a peak in an output from the differential current sensor.

The present invention belongs to the technical field of power electronic converters and discloses a medium-voltage distribution network flexible interconnection switch topology and control method. The medium-voltage distribution network flexible interconnection switch topology provided by the present invention includes three connected reactors L1, three connected reactors L3, two chain-type STATCOMs, two three-phase isolation transformers, two three-phase LC filters, two three-phase inverter circuits, and a DC port. Back-to-back three-phase converters are introduced at the ends of the chain-type STATCOMs of two feeders. Through the back-to-back three-phase converters, active power flow mutualization between the two medium-voltage chain-type STATCOMs, that is, between two different feeders, can be achieved. The present invention can achieve DC capacitor voltage balancing of the chain-type STATCOM submodules of the two feeders. Compared with the BTB-VSC commonly used in existing medium-voltage distribution network flexible interconnection demonstration projects, this solution has lower cost, simpler topology, easier control, and does not need to consider the active and reactive power decoupling issues between interconnected feeders, making it easy to promote and apply on a large scale.

The invention discloses a four-port magnetic network energy router prediction control method and system based on a data model, and belongs to the technical field of multi-port isolation type power electronic converters. The method comprises the following steps of: establishing a power model of the four-port magnetic network electric energy router and a power data model of each port, discretizing and matrix the data model, establishing an error between the discrete data model and actual data, and updating the data model in real time; predicting the power of each port in the future according to the data model of each port, establishing a phase shift angle set range of each port in combination with the actual power, and calculating power prediction corresponding to different phase shift angle sets; and finally, selecting a phase shift angle set corresponding to the minimum power error as an optimal set, and applying the optimal set to the next control period. According to the method, challenges caused by external environment changes and internal parameter fluctuations can be effectively handled, and the router is ensured to stably and efficiently work under different operation conditions.

The invention relates to the technical field of power electronic converters, in particular to a converter networking control method with a low-frequency impedance remodeling function. Comprising a network construction control module, a virtual impedance control module, a first coordinate transformation module, a second coordinate transformation module, a third coordinate transformation module, a current control module, a voltage filtering module, a low-frequency impedance remodeling module and a coordinate inverse transformation module. According to the method, low-frequency-band positive impedance is achieved, the stability of the power electronic converter in a weak power grid environment is improved, meanwhile, the modular design is easily integrated into an existing converter system, the oscillation risk caused by fundamental frequency negative impedance is thoroughly eliminated, broadband compatibility is achieved, the 0-200 Hz harmonic range is covered, and the performance is optimized through an adjustable remolding coefficient kz.

The invention discloses a resonant converter output overload and short circuit protection system and method without output current detection, and belongs to the technical field of power electronic converters. When a resonance tank current peak detection signal is equal to a ramp signal to trigger a comparator to output a high-level pulse, the edge triggers the microcontroller to interrupt, and the register value of the current ramp signal is captured immediately after interruption, so that a resonance current peak can be obtained. After an output overload and short circuit fault mark based on the value and the output voltage is triggered, the switching frequency is adjusted through the slope parameter self-adaptive controller to achieve output overload protection, and when the output overload is serious or short circuit occurs, rapid wave sealing protection can be achieved through a software code and a hardware comparator. And meanwhile, the soft start function of the resonant converter can be realized by gradually decreasing the initial value of the set slope descent rate cycle by cycle during starting. The control performance of the resonant converter is improved under the control of the peak current, and the output overload and short circuit protection function can be realized without adding an output current detection circuit.