281 results about "Energy transfer" patented technology

The invention relates to the field of electromagnetic induction heating, and discloses a global temperature control method for an electromagnetic induction heating system, which comprises the following steps of: acquiring a two-dimensional temperature distribution diagram of a heating area at a plurality of key moments through a multi-point infrared temperature acquisition and induction heating coil synchronous excitation mechanism; performing multi-dimensional region segmentation on the global temperature scene data set, and identifying a temperature abnormal region and a thermal diffusion path feature based on a boundary thermal gradient change rate and an energy transfer path analysis algorithm; a distributed power regulation and control method and a historical thermal field evolution rule are introduced based on the regional thermal response feature map; thermal field feedback information is collected in real time in the temperature control process, and the current global thermal field state is judged in combination with a thermal distribution stability judgment criterion; and based on the updated control parameter configuration table, in combination with the thermal performance parameters of the material and the geometric information of the workpiece, generating an operation instruction set of the heating process, and executing intelligent regulation and control. The induction heating device has the advantage of improving the induction heating quality.

The invention discloses a method for suppressing subsynchronous oscillation of a doubly-fed grid-connected system, and relates to the technical field of stability control of a power system, and the method comprises the specific steps: S100, extracting the amplitude and phase angle of a subsynchronous frequency component, S200, generating a rotor compensation current instruction according to the amplitude and phase angle of the subsynchronous frequency component and a dynamic gain, and S200, generating a rotor compensation current instruction according to the rotor compensation current instruction; s300, dynamically adjusting the gain according to the suppression ratio and the amplitude of the target magnetic field during operation, S400, calculating the feed-forward decoupling voltage, S500, calculating the suppression ratio after injection, and executing a hierarchical control strategy. Subsynchronous oscillation suppression from the electromagnetic essential level is realized, and by monitoring the subsynchronous component of the air-gap magnetic field in real time and injecting the anti-phase compensation current at the rotor side, the suppression efficiency of the subsynchronous oscillation is improved. Active interference of a stator magnetic field and a rotor magnetic field in a subsynchronous frequency band is cancelled, an energy transfer path of subsynchronous oscillation is directly blocked, oscillation forming conditions are destroyed, and a dynamic gain adjustment mechanism optimizes compensation intensity according to a real-time suppression effect so as to cope with 5-45Hz subsynchronous oscillation frequency change.

The invention discloses a hydrocarbon fuel boiling point and quasi-critical parameter measurement and phase diagram drawing method. The method comprises the following steps: conveying a target substance to a calorimetric tube and heating the target substance to a target temperature; relevant parameters are monitored in real time; according to the parameters monitored in real time, the boiling point of the target substance is obtained based on heat transfer characteristics in the fluid phase change process; on the basis of an energy transfer model between the calorimetric tube and the fuel, a function of a target substance heat sink changing along with the temperature is obtained online; after the heat measuring pipe is cooled to the room temperature, the pressure is adjusted, and the steps continue to be executed to obtain functions of the boiling point of the target substance and the heat sink of the target substance changing along with the temperature under different pressures; based on a quasi-critical parameter measurement method, quasi-critical parameters of a target substance are obtained, and a P-T phase diagram of the target substance is drawn. The invention further discloses a device for hydrocarbon fuel boiling point and quasi-critical parameter measurement and phase diagram drawing. According to the method and the device, accurate measurement of the boiling point and the quasi-critical parameters and accurate drawing of the phase diagram can be realized.

The invention discloses a thermal power generating unit operation state detection method and system, and relates to the technical field of operation state detection, and the method comprises the steps: S100, building a working condition variable label; s200, carrying out statistics on correlation coefficients of sensors and faults under various working conditions in historical operation data of the thermal power generating unit, dynamically updating weights, and storing the weights in a working condition database; s300, based on the energy transfer chain of the thermal power generating unit, establishing a parameter incidence matrix between devices; according to the method, the data weights of different sensors are adaptively adjusted according to the real-time operation state of the equipment, the defect that the traditional multi-sensor fusion adopts fixed weight or simple weighted average and is difficult to adapt to the working condition change is overcome, a physical relationship network between the equipment is constructed, key associated parameters are identified in an energy transfer form, and the fault identification accuracy is improved. The robustness of anomaly monitoring under complex working conditions is improved, and the false alarm rate is reduced.

The invention discloses a mine equipment control system and method, and relates to the technical field of camping mine equipment control, and the method comprises the following steps: during the operation period of a crusher, obtaining various parameter information generated in the crushing process of the crusher in real time, including vibration response characteristics and energy transfer and dissipation characteristics; according to the method, the vibration response characteristics and the energy transfer characteristics of the crusher are obtained in real time, intelligent analysis is carried out in combination with a machine learning model, the system can efficiently recognize abnormal states and dynamically classify the abnormal states into accidental or non-accidental anomalies, and shutdown and false alarms are reduced. For accidental abnormity, the system automatically adjusts parameters to return to normal; and for non-accidental abnormity, the system triggers early warning and carries out maintenance, so that further damage is avoided. According to the method, the service life, the operation efficiency and the automation level of equipment are improved, and the maintenance cost and the sudden failure risk are reduced.

The invention discloses an electricity-hydrogen-ammonia coupling system configuration method and system, and relates to the technical field of electricity-hydrogen-ammonia coupling systems, and the method comprises the steps: sequentially carrying out two-stage clustering according to renewable energy source daily output data, electrothermal hydrogen daily load data and daily net energy, and generating a typical daily scene and a clustering index; performing electric hydrogen ammonia energy storage collaborative simulation operation on all the typical day scenes, and reconstructing a year-round energy storage state based on a clustering index according to the variation of the hydrogen storage amount and the ammonia storage amount after simulation operation of each typical day scene; and taking the minimum annual total cost formed by the simulation operation cost, the capacity configuration cost and the hydrogen safety risk cost as an optimization target to obtain an optimal equipment capacity configuration scheme. While the calculation cost is reduced and the solving efficiency is improved, the time sequence connection characteristic and the energy storage characteristic of different long-time energy storage are kept, and multi-time-scale energy transfer is realized, so that the applicability and the economical efficiency of a planning scheme are improved.

The invention discloses a load demand-based cross-period dynamic hydrogen storage planning method, which relates to the technical field of energy utilization and comprises the following steps of cross-period hydrogen storage system modeling, typical day selection and feature extraction, comprehensive energy system planning model establishment, random-robust two-stage optimization method solving and objective function design. By designing the introduction and modeling of the IHS, the energy transfer function is realized, the problem that energy storage equipment in a traditional power system cannot store energy across seasons is solved, the technical challenge of unbalanced power supply and demand is overcome, the permeability of renewable energy sources is improved, wind and light abandoning phenomena are reduced, and carbon emission is reduced. And the realization of low-carbon and green energy targets is promoted.

The invention relates to the technical field of cooling fan control, and discloses an anti-EMI cooling fan filtering and noise suppression system controlled by a dynamic coupling path, and the system comprises a modeling subsystem which is used for carrying out the electromagnetic energy transfer modeling of a cooling fan, and obtaining an EMI energy balance equation set; the extraction subsystem is used for extracting the electromagnetic interference transfer relation among the components of the cooling fan; the calculation subsystem is used for calculating noise energy distribution data in a preset rotating speed range; the analysis subsystem is used for performing frequency self-correlation analysis on the parameter space distribution data to obtain EMI and noise parameter time sequence characteristic data; the real-time adjusting subsystem is used for inputting the EMI and noise parameter time sequence characteristic data into a prediction model for characteristic operation, PWM control correction parameters are obtained, the output power and the rotating speed of a heat dissipation fan are adjusted, and collaborative optimization among EMI suppression, noise control and heat dissipation performance is achieved through the system.

The invention discloses an isolation circuit, a three-phase isolation circuit, a controller, a method and a storage medium, and the isolation circuit comprises an input filter capacitor (Ci), a first inductor (Lf1), a second inductor (Lf2), an upper tube (Q1), a lower tube (Q2), a first energy transfer capacitor (C1), a second energy transfer capacitor (C2), a first transformer (T1) and a second transformer (T2). Meanwhile, a single-stage isolation topology control algorithm is simplified, the conversion efficiency is greatly improved, the requirements of higher power level design and wider output voltage range can be met, and higher input voltage working capacity can be achieved; the electromagnetic compatibility of the power supply module can be greatly improved due to the double-inductor design of input energy transfer; furthermore, an active power factor calibration function can be realized, and input and output current ripples and voltage ripples can be greatly reduced through upper and lower tube staggered phase-shifting control, so that the service life of an output capacitor is prolonged.

A system for inductive energy transfer may include a stationary induction charging device including a stationary energy coil, a mobile induction charging device including a mobile energy coil, and a positioning device configured to detect a positioning of the stationary energy coil and the mobile energy coil relative to one another. During a charging operation of the system, one of energy coils may provide an alternating magnetic field which induces a voltage for energy transfer in the other energy coil and / or the induction charging devices may be disposed spaced apart from one another in a height direction. The positioning device may include i) four transmission coils in one of the induction charging devices and ii) at least one receiver in the other induction charging device. The transmission coils may, during a positioning operation, provide positioning fields that are distinguishable from one another.

A power receiver (301a, 301b, 301c, 301d, 301e, 301f) is disclosed herein. In a specific embodiment the power receiver has a first electrode (300) arranged to be electrically coupled to a body (105) of a living being, the first electrode (300) operable to receive an electrical signal via the body; and a rectifier (307) for rectifying the electrical signal into a rectified electrical signal. The rectifier (307) includes a plurality of rectifier switches and operable in a bulk biasing mode in which first selected rectifier switches of the plurality of rectifier switches are forward bulk biased. A power transmitter (201), an energy transfer apparatus (100) and a method of transmitting electrical power are also disclosed.

The invention belongs to the technical field of co-scheduling of a river water path hydrogen chain and a watershed power system thereof, and particularly relates to a medium and long-term scheduling method of a power system fused with a flexible water path hydrogen chain. Comprising the following steps: establishing THPE operation constraints considering upstream river water level influence; the influence of the seasonal water level of the river channel on HV navigation conditions is considered, and HV space-time energy transfer constraints are constructed; taking the lowest operating cost of the waterway hydrogen chain and the watershed power system thereof as an objective function, and proposing a medium-and-long-term scheduling model of the waterway hydrogen chain watershed power system; the influence of the hydrogen carrying capacity of the hydrogen transport ship on the real-time hydrogen charging and discharging rate is considered, and a precision self-adaptive piecewise linearization method is designed to improve the solving efficiency; processing the nonlinear constraint of the model by adopting a linearization method, and solving the scheduling model to obtain an optimization strategy; according to the optimization strategy, medium-and-long-term cooperative operation of the waterway hydrogen chain and the watershed power system thereof is guided. According to the method, the cooperative scheduling capability and economical efficiency of the hydrogen-electricity system can be remarkably improved.

Resonators for use in a transcutaneous energy transfer system (TETS) are provided. A resonator includes a housing, a magnetic core positioned within the housing, the magnetic core defining an annular groove and a central aperture, a coil element positioned within the annular groove, and at least one layer positioned within the central aperture, the at least one layer comprising a non-magnetic, non-metallic material.

The invention belongs to the technical field of comprehensive energy scheduling, and particularly relates to a planning method and system considering posterior extreme scene re-identification of an energy storage system. The method comprises the following steps: performing scene clustering and reduction on new energy output and load data by adopting an improved clustering and scene reduction method to obtain a typical scene; inputting the typical scene into a multi-target double-layer capacity optimization configuration model, and solving to obtain the optimal configuration capacity of each device of the electricity-hydrogen hybrid energy storage system; carrying out year-round optimization operation simulation on the obtained optimal configuration capacity, and checking whether an extreme scene exists in the electricity-hydrogen hybrid energy storage system in all scenes or not; and if yes, supplementing the extreme scene into the typical scene, carrying out optimal configuration again, and carrying out iterative loop to obtain the final optimal configuration capacity. According to the method provided by the invention, the hydrogen energy storage daytime energy transfer potential can be exerted, a normal scene and a new energy continuous low output extreme scene are considered at the same time, and the dependence of an electricity-hydrogen coupling system on a superior power grid is reduced.

An electricity-conducting connector assembly for connecting a free-steering mobile machine to a stationary electricity source while moving includes an electricity-conducting boom assembly including a proximal end and a distal end, the proximal end of the boom assembly movably connected to a body of the mobile machine; an electricity-conducting arm assembly including a proximal end and a distal end, the proximal end of the arm assembly connected to the distal end of the boom assembly; and an electricity-conducting contactor assembly connected to the distal end of the arm assembly. The arm assembly includes at least three longitudinally extendable arms arranged parallel to one another.

The invention belongs to the technical field of collaborative management, and discloses a public building time period photovoltaic photo-thermal heat pump collaborative control method and system, and the method comprises the steps: obtaining building management and control information in a public building, and the building management and control information comprises building energy consumption data, environment meteorological data and equipment operation data; building a building energy consumption model based on the building energy consumption data; carrying out key analysis in combination with environmental meteorological data, and generating a self-adaptive energy distribution matrix; carrying out omnibearing monitoring and mode analysis on the basis, and obtaining an equipment operation efficiency log; performing energy domain division and collaborative strategy configuration on the basis of an equipment operation efficiency log, constructing a virtual energy network and an energy circulation rule, performing differential control parameter generation and integrated analysis, forming a dynamic optimization strategy and a real-time regulation and control scheme, and updating the adaptive energy distribution matrix; according to the invention, a comprehensive and intelligent control solution is provided for efficient cooperative operation of the photovoltaic photo-thermal heat pump in the public building.

The invention discloses a furnace flue gas waste heat graded cycle power generation method and system, which combines multi-stage purification and temperature division utilization, and comprises the following steps: firstly, carrying out component analysis and desulfurization purification treatment on furnace flue gas, establishing a layered purification chain, and identifying an acid dew point area; a safe flue gas purification area is formed through material adaptability evaluation and corrosion control measures; then carrying out temperature gradient analysis and temperature field reconstruction on the purified flue gas, establishing a heat grade distribution mechanism and forming a gradient heat energy flow to realize complementary utilization of heat sources at different temperature sections; a water vapor main cycle and organic working medium auxiliary cycle cascade power generation system is constructed, and the magnetic suspension bearing technology is integrated to improve the auxiliary cycle power generation efficiency; establishing a heat balance parameter and optimizing a circulation network through heat matching degree monitoring and mismatch detection; and finally, an energy transfer matrix is constructed, distributed power generation configuration is formed through generator coupling analysis and rotating speed coordination control, stable electric energy output is completed, and efficient utilization of waste heat is achieved.

The invention provides a dual-time-scale optimization scheduling system and method considering diesel storage insurance supply and new energy consumption, and the method comprises the steps: collecting a plurality of data in real time, and outputting a historical data set and real-time monitoring data to a scheduling module; based on the wind and light output predicted values and load predicted values of the day before dispatching and the dispatching day, a multi-target optimization model is constructed, an energy storage charging and discharging plan, a diesel generator start-stop plan and an electric vehicle dispatching instruction are output, and cross-day energy transfer is achieved; on the basis of a model prediction control principle, 15 minutes are taken as a scheduling step length, a day-ahead scheduling plan is corrected in a rolling manner in combination with ultra-short-term source load prediction data, and prediction deviation is stabilized; controlling charging and discharging switching of the energy storage system, dynamic adjustment of the charging power of the electric vehicle and the operation state of the charging pile; through cooperative operation of day-ahead pre-scheduling and intra-day rolling optimization, source-load balance and low-carbon operation are realized. According to the scheduling system, long-period energy planning and short-period dynamic correction are both considered, and the self-consistency and low-carbon property of the off-grid charging station are improved.

The invention relates to the technical field of energy control, and provides an ultra-low environment temperature carbon dioxide-based dual energy supply control system, which comprises a main circulation unit, an auxiliary circulation unit, a heat exchange water path module and a controller, a CO2 heating loop is adopted in the main cycle, and an R134a condensation supercooling loop is adopted in the auxiliary cycle; a controller constructs a directed graph structure based on thermodynamic topology, a three-branch convolution mechanism is adopted to model an energy transfer path, embedded representation is optimized and controlled in combination with an interval-contrast loss function, and an accurate control instruction is generated to adjust components such as a compressor and a throttling valve; in the aspect of fault diagnosis, a time parameterization convolution-symmetric GRU model is constructed, a Legendre polynomial is utilized to model a time convolution kernel, a Verlet integral mechanism is combined to reconstruct a hidden state path, and accurate identification of an abnormal trend in multi-source data is realized. According to the system, the energy supply stability and the intelligent level in the extremely low-temperature environment are improved.

The invention discloses a broadband resonance damping characteristic regulation and control method and device, and the method comprises the steps: carrying out the broadband signal sampling of a target node in a power system, obtaining the instantaneous distortion of a target voltage and the cumulative deviation of a target current, and carrying out the calculation of an energy transmission delay factor and an energy balance correction factor; according to the energy transfer delay factor and the energy balance correction factor, calculating a local damping dynamic coefficient and a regulation and control precision real-time error so as to optimize target voltage instantaneous distortion and target current accumulation deviation; and updating a power flow distribution proportion according to the optimized target voltage instantaneous distortion, the optimized target current accumulation deviation and the local damping dynamic coefficient so as to improve the voltage stability of the target node. Transient characteristics of energy changes of the electric field and the magnetic field can be quantitatively analyzed through an energy transfer delay factor and a balance correction factor; and according to the transient characteristic, the broadband resonance damping characteristic is regulated and controlled in combination with the real-time operation state of the power system, so that the stability of the power system is improved.

Bidirectional energy transfer systems are provided for transferring energy between an electrified vehicle and other structures. The bidirectional energy transfer system may include a home energy management system having a dark start energy storage resource. The home energy management system may enter hibernation mode when the dark start energy storage resource reaches a low power state. The home energy management system may subsequently exit hibernation mode using a variety of recovery strategies when the electrified vehicle returns to the structure or near when the vehicle is expected to return to the structure. Placing the home energy management system in hibernation mode ensures that the dark start energy storage resource will have a sufficient amount of energy for powering system loads necessary to initiate the energy transfer from the vehicle to the structure during the grid power outage.

Energy transfer system, in particular rotary transfer system, for contactless transmission of electrical energy into an excitation winding (6) of a rotor (5) of an electric machine (1), comprising a static primary unit (11) and a secondary unit (15) rotatable about a transfer shaft (14), wherein the secondary unit (15) has a secondary winding (16), characterized by the fact that the secondary winding (16) of the secondary unit (15) is designed as an air coil and the secondary unit (15) is designed without a secondary core and that at least a secondary shield (17) of the magnetic field is provided on the secondary unit (15) to partially compensate for the deteriorated magnetic flux conduction.

The invention is suitable for the technical field of carbon reduction and energy conservation, and provides a steel product carbon footprint evaluation method and system, and the method comprises the steps: obtaining the production process data and energy circulation data of a to-be-evaluated product, and determining the production unit process of the to-be-evaluated product according to the production process data, determining an energy unit process of the to-be-evaluated product according to the energy transfer data; according to the second input data and the second output data of the energy unit process, calculating a self-produced energy carbon emission factor of the to-be-evaluated product through an energy system carbon emission factor model; obtaining first input data and first output data of a production unit process, and determining a process coefficient of the to-be-evaluated product in the production process according to the first input data and the first output data; and based on the process coefficient, the self-produced energy carbon emission factor, the first input data and the first output data, obtaining a carbon footprint evaluation result of the to-be-evaluated product through a life cycle carbon footprint evaluation model.

The invention provides self-powered gait monitoring sole equipment and a gait monitoring method, and belongs to the technical field of wearable medical equipment. In order to solve the problems that existing monitoring equipment is large in size or inconvenient in power supply and storage and the like, plantar equipment comprises an insole body, the insole body comprises an insole layer and an interlayer, the interlayer is arranged at the bottom of the insole layer, and a signal transmitter, a pressure sensor and a position sensor are arranged on the insole layer. The interlayer is provided with a hard rubber isolation pad, a movement energy conversion part, an energy storage part, a position sensor and a wire, the movement energy conversion part is located at the middle and rear sole part in the interlayer, the energy storage part is connected with the movement energy conversion part, and the two ends of the wire connect the pressure sensor and the position sensor to a signal transmitter through the energy storage part respectively; mechanical energy generated in the foot landing and lifting process of a user is converted into electric energy, and the electric energy is stored in the capacitor after being subjected to rectification and voltage stabilization and used for continuous power supply of plantar equipment.

The present invention provides a bidirectional energy-transfer system comprising: a thermally and / or electrically conductive concrete, disposed in a structural object; a location of energy supply or demand that is physically isolated from, but in thermodynamic and / or electromagnetic communication with, the thermally and / or electrically conductive concrete; and a means of transferring energy between the structural object and the location of energy supply or demand. The system can be a single node in a neural network. The thermally and / or electrically conductive concrete includes a conductive, shock-absorbing material, such as graphite. Preferred compositions are disclosed for the thermally and / or electrically conductive concrete. The bidirectional energy-transfer system may be present in a solar-energy collection system, a grade beam, an indoor radiant flooring system, a structural wall or ceiling, a bridge, a roadway, a driveway, a parking lot, a commercial aviation runway, a military runway, a grain silo, or pavers, for example.

The invention belongs to the technical field of power system dispatching methods, and particularly relates to a water storage and navigation aid waterway hydrogen chain and drainage basin power system cooperative dispatching method for a hydropower station. Comprising the following steps: establishing an RSOC operation constraint considering flexible conversion of hydrogen production and power generation; constructing an HV space-time energy transfer constraint; constructing a short-term scheduling model of the waterway hydrogen chain basin power system; designing a double-layer algorithm capable of realizing optimal distribution of thermal power of the thermal power plant and the electric boiler; processing the nonlinear constraint of the short-term scheduling model by adopting a linearization method, and solving the short-term scheduling model to obtain an optimization strategy; and guiding short-term cooperative operation of the waterway hydrogen chain and the watershed power system thereof according to the optimization strategy. The scheduling method can further reduce the system operation cost while giving consideration to the energy balance of the waterway hydrogen chain and the watershed power system thereof, coordinates the contradiction between the hydropower station power generation power and the HV transfer feasibility, and improves the operation flexibility of the thermal power plant.

The invention relates to the technical field of central air conditioner control, and discloses a central air conditioner energy-saving disinfection and killing control method and system based on Internet of Things monitoring, and the method comprises the steps that temperature and humidity time sequence data monitored by the Internet of Things of a central air conditioner and a current and voltage parameter matrix of a high-voltage electrostatic disinfection and killing module are obtained; performing multi-modal feature fusion calculation to generate a multi-dimensional state matrix; establishing an energy consumption-disinfection associated nodal topology network, simulating an energy transfer path and outputting a synergistic effect probability value set; performing space-time correlation mapping operation to generate a sterilization-energy consumption coupling prediction curve; calculating an energy-saving efficiency factor and generating a standardized coupling coefficient thermodynamic diagram; and extracting the operation quantitative index, dynamically comparing the operation quantitative index with a preset threshold value, and generating a regulation and control scheme when the index breaks through the threshold value. According to the method, collaborative optimization control over energy conservation and disinfection of the central air conditioning system is achieved, the energy utilization efficiency is improved, the disinfection effect is guaranteed, and high adaptability and expandability are achieved.

The invention belongs to the technical field of anti-seismic structures, and particularly discloses a multidirectional strong-reset damping support which comprises a supporting part, an energy transfer part and a damping part, the supporting part is used for supporting a building in the vertical direction and comprises an elastic base, a top plate and a bottom plate, the top plate is arranged at the top of the elastic base and used for being connected with an upper structural part of the building, and the bottom plate is arranged at the bottom of the elastic base. The bottom plate is arranged at the bottom of the elastic base and used for being connected with a foundation of a building. The energy transmission part comprises at least one set of steering parts, and each steering part comprises an inhaul cable and a baffle. The damping parts are in one-to-one correspondence with the steering parts and arranged in the transverse damping area, each damping part is of a deformable structure, is provided with an elastic end and is fixed to the bottom plate, and the elastic ends are connected with the baffles. The supporting part, the energy transfer part and the shock absorption part are utilized to integrate supporting, energy dissipation and reset functions, the problem that connection of energy dissipation and shock absorption components needs to be specially designed in the design process is solved, and more convenient anti-seismic reinforcement is carried out on an existing shock absorption and isolation structure adopting a support.

A demand and supply planning method generates a supply-demand plan including information that specifies operation of an energy generation unit for each unit time in a microgrid having energy generation units being connected to an external energy supply system and generating energy while consuming fuel, an energy storage unit, and a load unit; by calculating an optimization problem related to an objective function including terms related to energy transfer from the external energy supply system in the microgrid and terms related to fuel consumption in the microgrid by using a constraint condition related to a relationship between information related to an operating duration time in each of the one or more energy generation units at a start time for generating the supply-demand plan and a minimum operation time constraint of the energy generation unit; and outputting the supply-demand plan based on a calculation result of the optimization problem.

The invention relates to the technical field of off-grid and grid connection, and provides a closed-loop control strategy and circuit based on threshold criterion and dual-mode switching. Different control modes are triggered according to the change of the voltage difference by monitoring the voltage difference delta V of the positive and negative bus capacitors in real time. When the capacitor voltage difference delta V is lower than a preset threshold value, the system enters a standby mode, and additional adjustment is not needed; and when the voltage difference delta V is greater than or equal to a threshold value, dynamic compensation is triggered and next-step control is entered. The system judges through voltage polarity, and if a positive bus overvoltage working condition is detected, a BUCK step-down mode is started; and if the working condition is the negative bus overvoltage working condition, starting a BOOST mode. In order to ensure independence and stability of a voltage regulation process, an independent decoupling circuit is adopted to isolate an energy transfer process from a main inverter path in a BUCK or BOOST mode. Based on the real-time feedback closed-loop control of the capacitor voltage difference delta V, the switch duty ratio is dynamically adjusted, the dynamic response capability and stability of the system are effectively improved, the overvoltage risk is reduced, and the electric energy regulation and control efficiency is optimized.