1168 results about "Transverter" patented technology

Systems and methods are provided for a digital beamformed phased array feed. The system may include a radome configured to allow electromagnetic waves to propagate; a multi-band software defined antenna array tile; a power and clock management subsystem configured to manage power and time of operation; a thermal management subsystem configured to dissipate heat generated by the multi-band software defined antenna array tile; and an enclosure assembly. The multi-band software defined antenna array tile may include a plurality of coupled dipole array antenna elements; a plurality of frequency converters; and a plurality of digital beamformers.

Systems and methods are provided for a digital beamformed phased array feed. The system may include a radome configured to allow electromagnetic waves to propagate; a multi-band software defined antenna array tile; a power and clock management subsystem configured to manage power and time of operation; a thermal management subsystem configured to dissipate heat generated by the multi-band software defined antenna array tile; and an enclosure assembly. The multi-band software defined antenna array tile may include a plurality of coupled dipole array antenna elements; a plurality of frequency converters; and a plurality of digital beamformers.

Systems and methods are provided for a digital beamformed phased array feed. The system may include a radome configured to allow electromagnetic waves to propagate; a multi-band software defined antenna array tile; a power and clock management subsystem configured to manage power and time of operation; a thermal management subsystem configured to dissipate heat generated by the multi-band software defined antenna array tile; and an enclosure assembly. The multi-band software defined antenna array tile may include a plurality of coupled dipole array antenna elements; a plurality of frequency converters; and a plurality of digital beamformers.

The invention relates to the technical field of automatic control, in particular to an efficient magnetic suspension water chilling unit control system which comprises a refrigerant flow monitoring module, a dynamic flow adjusting module, a start-stop delay judging module, a temperature gradient sensing module and a frequency self-adaptive adjusting module. According to the method, the temperature difference curve is established through real-time monitoring data, the refrigerant flow synchronism is analyzed, temperature difference abnormity can be accurately recognized, the refrigerant adjusting requirement is extracted, traditional threshold value judgment lag is avoided, the refrigerant flow is controlled in real time, fluctuation impact is buffered, and the adjusting precision is improved by dynamically adjusting the opening degree of the electronic expansion valve and the rotating speed of the circulating pump; the method has the advantages that starting and stopping conditions are accurately judged, misoperation is reduced, early positioning of thermal imbalance is achieved through temperature difference sensing of an evaporator, a compression cavity and a condenser and establishment of an internal temperature difference distribution diagram, energy efficiency reduction is avoided, the frequency of a frequency converter is adjusted according to temperature difference distribution, the optimal load is matched, frequency adaptivity and system load response are improved, and refrigeration cycle energy efficiency is optimized.

The invention provides a frequency converter dynamic fault diagnosis method and system based on a multi-brand load test platform. According to the method, multiple real-time operation parameter sets are acquired, the amplitude attenuation threshold and the frequency fluctuation interval of a voltage waveform fragment are dynamically adjusted according to a load mode configuration file, the dynamic voltage reference parameter corresponding to the current load mode is generated, and then the actual waveform and an expected current phase curve are compared frame by frame; the method comprises the following steps: firstly, calculating to obtain a phase offset, then constructing a multi-dimensional operation characteristic spectrum, then carrying out time sequence cross validation on a sudden change time node of a power factor jump trajectory and an abnormal waveform position in a harmonic distortion incidence matrix, outputting an abnormal mode code, and finally, matching a load adaptation grade constraint condition to generate a diagnosis report; according to the technical scheme provided by the invention, the fault diagnosis precision and the cross-brand system adaptation capability in a complex load scene are remarkably improved, and the problem of misjudgment of a single brand threshold rule in a multi-device scene is effectively solved.

The invention belongs to the technical field of intelligent control, and particularly relates to a water pump multi-mode intelligent control method based on a PLC. Operation parameters are acquired in real time through a data acquisition module, a target mode is selected from constant-pressure water supply, constant-flow water supply, energy-saving optimization and fault emergency modes through a mode judgment module according to preset triggering conditions, and an operation strategy including a start-stop sequence, a target rotating speed, a frequency converter output frequency and a pressure set value is generated through a strategy generation module. The control execution module converts the strategy into a control instruction and outputs the control instruction to the water pump driving module, and linkage operation and mode switching of the multiple water pumps are achieved in combination with the mode linkage module. And the recording and optimizing module is used for storing and analyzing the operation data and optimizing mode switching conditions and operation strategies. Self-adaptive control and multi-pump cooperative scheduling in multiple modes are achieved, the stability and energy saving performance of a water supply system are improved, and the service life of equipment is prolonged.

The invention relates to the field of pump set control, in particular to a multi-modal pump set dynamic optimization control method and system, and the method comprises the steps: collecting the current waveform, pressure pulsation spectrum and flow time sequence data of each unit of a pump set through a distributed sensor array, and carrying out the time-frequency domain fusion processing to generate an operation state tensor; and inputting a multi-modal identification neural network, and outputting a dominant modal identifier and a modal confidence vector. And according to the modal confidence, activating a basic optimization strategy library or executing cross-modal strategy collaboration, and generating an optimization instruction. And dynamically selecting an instruction conversion path to obtain a frequency converter parameter set, loading the frequency converter parameter set to a programmable logic controller, and driving an execution mechanism to converge a moving track. The method can effectively cope with changes of multi-mode operation states and complex working conditions, and dynamic optimization of the pump set is achieved.

The invention relates to the technical field of frequency converter anomaly detection, in particular to a hydraulic engineering frequency converter state detection method and system. The invention aims to improve the accuracy of abnormal data point detection in the frequency converter performance parameter time sequence data, and particularly focuses on the influence of environmental factors on performance parameters. Performance parameter time sequence data and environment parameter time sequence data are synchronously obtained, discrete wavelet transform is used for decomposing performance parameters in a multi-layer mode, and approximation coefficients are mainly analyzed to insight the operation state of the frequency converter. And after the suspected abnormal data segments are preliminarily screened, environment abnormal indexes are calculated in combination with environment parameters, and fluctuation degree values of the suspected abnormal data segments are analyzed. And based on the environmental anomaly index and the fluctuation degree value, adaptively adjusting the initial threshold value of each approximation coefficient to obtain an adaptive threshold value, and finally detecting abnormal data based on the adaptive threshold value. According to the method, abnormal data points caused by environmental factors can be effectively eliminated, and abnormal data points caused by abnormity of the frequency converter can be accurately identified.

The invention relates to the technical field of frequency converter harmonic control, in particular to a harmonic control method, system and device applied to a frequency converter, and the method comprises the steps: obtaining the current data of a rectification input side and an inversion output side of the frequency converter; obtaining the difference coefficient of the overall pulsation amplitude change of each period and the irregular coefficient of the corresponding pulsation time change, and further obtaining the harmonic influence coefficient of the rectification input side current of each period with the pulsation amplitude difference and irregular characteristics; calculating a deviation coefficient and a jitter abnormal coefficient of the inversion output side current of each period so as to obtain a harmonic influence coefficient of the inversion output side current of each period having waveform deviation and rapid jitter; therefore, the harmonic delay superposition interference coefficient is obtained, and the output current of the inverter is corrected in combination with the current data of the inverter output side. The harmonic control precision of the frequency converter can be improved.

The invention discloses a direct-current voltage self-balancing method in the high-low voltage ride-through process of a high-voltage frequency converter, and the method comprises the steps: obtaining an electric signal of the high-voltage frequency converter, calculating the Lyapunov index of a system in real time based on the electric signal, so as to quantify the chaotic state of the system, and generating a real-time Lyapunov index sequence; according to the real-time Lyapunov index sequence, the gradient of the real-time Lyapunov index sequence relative to a preset system state variable is determined, and a Lyapunov gradient field is constructed; using the Lyapunov gradient field to generate a basic control quantity through nonlinear mapping; and converting the basic control quantity into a pulse width modulation parameter to form a PWM control signal set to be applied to the high-voltage frequency converter. According to the method, the Lyapunov gradient field is constructed to provide prospective direction guidance for control, so that the chaotic oscillation is quickly suppressed, and the dynamic stability of the system under power grid disturbance is remarkably improved.

The invention discloses a dust removal fan frequency conversion control method and related equipment, and relates to the technical field of video control. The method comprises the steps that a training data set is generated based on historical video data of an iron notch area in the blast furnace tapping process; constructing an initial artificial intelligence model, and training the initial artificial intelligence model by adopting the training data set to obtain a target artificial intelligence model representing a mapping relationship among the dust concentration, the spark intensity and the fan frequency; based on the target artificial intelligence model and the current dust concentration feature and the current spark intensity feature in the current video data, the target fan frequency of the current tapping stage is determined; and generating a control signal based on the target fan frequency so as to adjust the operation frequency of the dust removal fan frequency converter through the control signal.

The invention discloses an energy-saving and consumption-reducing control method and system for a multi-stage variable frequency driven underground belt conveyor, and the method comprises the steps: obtaining coal flow data and conveying belt operation speed data according to a coal flow weight signal and an operation speed signal, and carrying out the filtering processing; abstracting and constructing a type-2 fuzzy set of the input parameters; and starting the belt conveyor, and performing multi-stage accurate control on the belt conveyor in combination with the two-degree-of-freedom PID and the type-II fuzzy set. According to the system, a coal flow monitoring sensor is installed on a belt conveyor; the speed sensor is mounted on the driving roller; the composite frequency conversion unit comprises a main frequency conversion unit and auxiliary frequency conversion units I and II, the main frequency conversion unit comprises a main frequency converter and a main motor which are connected, and each auxiliary frequency conversion unit comprises an auxiliary frequency converter and an auxiliary motor which are connected; the controller is connected with the coal flow monitoring sensor, the speed sensor, the composite frequency conversion unit and the human-computer interaction interface. According to the method and the system, multi-stage accurate control on the running speed of the belt conveyor can be realized, and the energy-saving effect is ideal.

The invention provides an intelligent harmonic dynamic compensation method and system for a data center. Wherein the dynamic coupling model is established through multi-dimensional data fusion. The method comprises the following steps: firstly, collecting equipment vibration, noise and electric energy quality data, and constructing a coupling model containing a vibration mode characteristic, a noise characteristic and harmonic distortion rate mapping relation; the heating and ventilation equipment operation condition is analyzed based on the model, and energy distribution caused by working medium flow and a motor is quantified into a working condition coefficient to be fed back to the model through frequency spectrum energy calculation. The nonlinear characteristic that electric energy harmonic changes along with loads is combined, the rotating speed range of the device is dynamically matched through frequency converter data, and the rotating speed difference of the device is mapped to a harmonic offset component generated by the frequency conversion device. And finally, generating an equipment parameter adjustment value matched with the current working condition, and realizing dynamic adaptation of harmonic compensation. According to the technical scheme provided by the invention, collaborative optimization of data center harmonic compensation and equipment operation conditions is realized.

The utility model discloses a cluster channel machine based on RF Transceiver software radio, which comprises an FPGA, a DSP, an ARM, a clock management chip, an LNA, a PA, a DSA and a SAW Filter, the FPGA is respectively connected with the DSP, the ARM, a Flash3 and the clock management chip, the DSP is connected with an SDRAM1 and a Flash1, the ARM is connected with an SDRAM2 and a Flash2, the clock management chip is connected with a TCXO, the cluster channel machine comprises an RF Transceiver connected with the FPGA and the clock management chip, the input end and the output end of the RF Transceiver are both connected with the SAW Filter, and the input end and the output end of the RF Transceiver are connected with the LNA, the PA, the DSA and the SAW Filter. And the LNA, the PA, the DSA, the SAW Filter and the RF Transceiver are sequentially connected and arranged to form an RF RX receiving channel and an RF TX transmitting channel. According to the utility model, the circuit of an RF transmitting and receiving channel is simplified, multiple paths of radio frequency signals can be directly adopted, the radio frequency signals from 300MHz to 6GHz are output, and the functions of digital filtering, digital up and down converters, digital combination, modulation and demodulation, automatic power control and the like are integrally realized; different functions can be realized by loading different waveforms, different requirements can be met without changing hardware, the cost, the power consumption and the size are reduced, the debugging process is reduced, and the production is more convenient.

The invention relates to the technical field of wire drawing machine frequency converter control. The invention relates to a control method and device for a frequency converter of a wire drawing machine, computer equipment and a storage medium, and the method comprises the steps: obtaining the tension feedback information of the wire drawing machine, carrying out the tension error calculation of the tension feedback information of the wire drawing machine, according to the real-time tension deviation value, the output frequency of the frequency converter is corrected through a nonlinear correction algorithm, the corrected output frequency of the frequency converter is obtained, and according to the corrected output frequency of the frequency converter, operation control information of the frequency converter of the wire drawing machine is generated so as to adjust operation parameters of the frequency converter of the wire drawing machine. The frequency converter control method has the effect of accurately controlling the frequency converter.

The invention discloses a movable trolley for secondary grouting of a double-shield TBM, and belongs to the technical field of tunnel construction equipment. In order to solve the problems of non-uniform slurry mixing, inaccurate grouting pressure control, low automation degree and the like of existing double-shield TBM secondary grouting equipment, a slurry storage system and a grouting execution system are borne through a movable supporting table, and the slurry storage system achieves slurry storage and stirring regulation and control through double storage tanks, a spiral stirring paddle and a liquid level monitoring module; the grouting execution system achieves accurate pressure control through cooperation of a double-outlet grouting pump, a pressure sensor and a frequency converter. The central controller receives liquid level and pressure signals and intelligently regulates and controls the rotating speed of the stirring paddle, the rotating speed of the grouting pump and switching of the slurry storage tank. The movable trolley is mainly used for secondary grouting operation in the double-shield TBM construction process, the grouting efficiency and quality can be improved, and tunnel construction safety and stability are guaranteed.

The invention discloses a frequency converter multi-stage cooperative rapid overcurrent protection circuit, and the overcurrent protection circuit cooperates with an IGBT inverter circuit, an IGBT drive circuit, a current sampling circuit and a master control MCU of a frequency converter to construct a three-stage cooperative protection system composed of hardware-stage extreme rapid protection, hardware-stage rapid protection and software-stage intelligent protection. And independent action and information interaction between the stages can be realized through circuit design. Compared with the prior art, protection blind areas are eliminated, nanosecond-microsecond level extreme protection is achieved, a multiple and high-reliability redundancy protection system is constructed, intelligent grading processing of faults is achieved, and the diagnosability of the system is enhanced.

The invention discloses a hybrid power device type three-level frequency converter common-mode voltage suppression method and device, and the method comprises the steps: carrying out the amplitude comparison of three-phase given reference voltage sinusoidal signals, and obtaining the maximum value, the intermediate value and the minimum value of the three-phase given reference voltage sinusoidal signals; respectively adding the maximum value, the intermediate value and the minimum value of the three-phase given reference voltage sinusoidal signal with the injected zero sequence voltage to obtain the maximum value, the intermediate value and the minimum value of the three-phase modulation signal; on the basis of introducing common-mode voltage suppression and neutral-point potential balance, a maximum value, an intermediate value and a minimum value in a three-phase modulation signal after zero-sequence voltage injection are respectively compared with three carriers to generate switching signals, and the switching signals act on the hybrid power device combined three-level frequency converter to realize common-mode voltage suppression. According to the invention, the service life can be prolonged by reducing the common-mode voltage of the frequency converter, and the midpoint potential fluctuation of the three-level frequency converter can be reduced.

The invention discloses a partial discharge fusion detection method based on multiple sensors, and relates to the field of power system detection, and the method comprises the steps: S1, multi-modal sensor cooperative deployment: firstly, after the multi-modal sensor cooperative deployment in S1 is completed, S2, time-space synchronization data collection is carried out, and then S3, signal preprocessing and feature extraction are carried out after the time-space synchronization data collection in S2 is completed; and S3, after signal preprocessing and feature extraction are completed, performing S4, feature level fusion innovation, when the S4, feature level fusion innovation is completed, performing S5, a decision level fusion mechanism, and finally performing S6, three-dimensional visualization and early warning after the S5, the decision level fusion mechanism is completed. According to the partial discharge fusion detection method based on the multiple sensors, in the strong interference environment of the frequency converter, the false alarm rate is compressed from 68% to 11% through multi-sensor cooperative noise reduction and dynamic weight distribution, and the anti-interference capability of the system is remarkably improved; and centimeter-level positioning precision is realized, and powerful support is provided for accurate fault positioning.

The invention provides a Q / V frequency band large-scale satellite communication load channel optimization method, which comprises a forward input link and a backward output link, and is characterized in that the forward input link comprises a V frequency band multi-beam antenna feed source array, a plurality of input preselectors, a V frequency band low noise amplifier input switch ring and a V / Ka integrated receiver assembly which are connected in sequence; the output end of the V-band multi-beam antenna feed source array is connected with the input end of the V / Ka integrated receiver assembly through a waveguide. The reverse output link comprises a Ka / Q frequency converter, a Q-band channel filter, a Q-band traveling wave tube amplifier, a change-over switch, a Q-band output duplexer or filter and a Q-band feed beam which are connected in sequence, and the output end of the Ka / Q frequency converter is connected to the input end of the Q-band channel filter through a waveguide; and the output end of the Q-band channel filter is directly connected to the input end of the Q-band traveling wave tube amplifier through the waveguide. Therefore, the method is low in link loss, high in space utilization rate and high in feasibility.

The invention discloses a cascade H-bridge frequency converter fault early warning method, which comprises the following steps of: acquiring field current signals of each H-bridge unit, performing bidirectional verification on signal zero points by adopting a reverse zero-crossover reconstruction method, and generating a reconstruction timestamp matrix; carrying out phase space differential mapping based on the matrix, and extracting a feature matrix capable of representing internal dynamic characteristics of the system by calculating topological invariants such as track length and curvature; after dimension reduction is conducted on the feature matrix, affinity matching is conducted on the feature matrix and a preset fault mode library through an immune memory prediction mechanism, rapid fault recognition is achieved, and prediction feature vectors are generated through extrapolation; and the prediction features, the residual error and the memory activation degree are combined, a quorum sensing collaborative judgment model is introduced, the diffusion process of abnormal signals is simulated, collaborative and robust judgment of the fault type, the occurrence time and the influence range is achieved, and an early warning instruction is generated. According to the method, the accuracy, reliability and advance of fault early warning are remarkably improved.

The invention discloses an intelligent transportation management system and method for a long-distance two-way transportation belt conveyor. According to the system, an anti-explosion frequency converter and an emergency stop device are connected with a driving motor; the test roller is mounted on the rack; the speed sensor and the vibration sensor are connected with the test roller. The image acquisition module is supported above the belt conveyor; the longitudinal tearing sensor is mounted on the rack; the radio frequency tag is embedded in the conveying belt, and the reader is supported above the rack; the method comprises the steps that the data collection assembly collects the running state of the conveyor in real time; the edge calculation module controls the rotating speed of a driving motor by using an explosion-proof frequency converter based on the coal flow proportion, and performs closed-loop adjustment in combination with the running speed data of the conveying belt; the edge calculation module senses the abnormal operation condition based on the vibration data and the tearing data, and senses the local deviation condition based on the positioning module. According to the system and the method, intelligent management of the running process of the belt conveyor can be realized.

A receiver includes an antenna block configured to transduce impinging electromagnetic signals into electrical signals; a signal conditioning block configured to condition electrical signals received from the antenna block; and a down-converter block configured to down-convert conditioned electrical signals received from the signal conditioning block. The down-converter block comprises a plurality of signal channels. The receiver further includes a plurality of analog-to-digital converters (ADCs) respectively connected to the signal channels of the down-converter block; and a field-programmable gate array (FPGA). The FPGA is configured to program the down-converter block by selecting a set of mixer frequencies and a set of bandwidths designed to remove interference signals in each signal channel. The selections are calculated to mitigate reductions in dynamic range in the ADCs due to interference. The FPGA is further configured to process digital signals received from the ADCs after the down-converter block has removed the interference signals.

This application is applicable to the field of satellite communication, and provides a K-band expandable tile subarray, a phased array antenna and a satellite system. The tile subarray includes: a K-band tile frequency converter and multiple K-band multi-channel tile components; a subarray digital phased array antenna is provided on the first side of each K-band multi-channel tile component, and a first radio frequency interface and a first power supply control interface are provided on the second side; the K-band tile frequency converter is provided with multiple second radio frequency interfaces and multiple second power supply control interfaces; the multiple K-band multi-channel tile components and the K-band tile frequency converter are connected through the first radio frequency interface and the second radio frequency interface, and the first power supply control interface and the second power supply control interface are connected. This application can achieve a low profile height, simplify the structure, improve the maintainability and expandability, and realize the design of subarray digital application.

The invention provides a high-voltage frequency converter control system, and relates to the technical field of power electronic control, the high-voltage frequency converter control system comprises a phase-shifting transformer, a multi-level inverter, an SPWM modulation module, a fuzzy PI current limiting controller and a virtual master-slave topology controller, the phase-shifting transformer is used for performing phase-shifting isolation on power grid input voltage and inhibiting input current harmonics; the multi-level inverter is in cascade connection with the output end of the phase-shifting transformer and used for inverting the direct-current voltage into multi-level alternating-current high voltage to be output. The SPWM modulation module is electrically connected with the multi-level inverter; the phase-shifting transformer is combined with the multi-level topology, so that the harmonic content of the input current is reduced to 1.5% or below, the standard can be met without an additional filter, the output voltage THD is controlled within 2% through the asymmetric rule sampling and tangent approximation method by the SPWM modulation technology, and motor heating and electromagnetic interference are remarkably reduced.

The invention discloses a protection device and method for a frequency converter and the frequency converter. The inverter end of the frequency converter is provided with an IGBT module, and a driving board is provided with a driving chip; the device comprises a first detection unit which is arranged at an emitting electrode of an IGBT module, detects whether the IGBT module has a type of short-circuit fault, and outputs a signal of the type of short-circuit fault to an input end of a driving chip when the IGBT module is detected to have the type of short-circuit fault so as to enable the driving chip to perform driving and wave turning-off, and a second detection unit which is arranged at an emitting electrode of the IGBT module and is used for detecting whether the IGBT module has the type of short-circuit fault. And the second detection unit is arranged at the collector of the IGBT module, detects whether the IGBT module has a second-class short circuit fault or not, and outputs a signal of the second-class short circuit fault to the input end of the driving chip when detecting that the IGBT module has the second-class short circuit fault, so that the driving chip drives to turn off waves. According to the scheme, the IGBT short-circuit fault detection circuit is arranged on the driving board of the frequency converter, so that rapid protection of first-class short circuit and second-class short circuit is realized.

The invention belongs to the technical field of water pumps, and discloses a water pump control method and device and electronic equipment. Determining a water pump protection level based on the water pump parameters; and controlling the water pump to execute a corresponding control strategy based on the water pump protection level. The running state of the water pump can be monitored in real time by accurately obtaining key data such as water outlet pressure and frequency converter parameters. The protection grade is determined according to comparison of the parameters and the preset threshold value, the corresponding control strategy is executed, and refined grading protection of the water pump can be achieved. By means of the process, early warning and abnormity processing can be conducted in time when the system is abnormal, fault deterioration is avoided, the service life of the water pump can be effectively prolonged, the maintenance cost is reduced, stable and reliable operation of the system is ensured, and the overall operation efficiency and safety of equipment are improved.

Provided are a method for controlling a cycloconverter circuit, a cycloconverter circuit, and an isolated converter. The cycloconverter circuit is configured to perform alternating current to alternating current conversion and includes a plurality of switch elements connected in a plurality of current paths. The plurality of switch elements are divided into a plurality of groups of switch elements. Each group of switch elements includes at least one switch element disposed in each current path. The method includes: when the cycloconverter circuit is in a zero-crossing detection stage, controlling a first group of switch elements to be turned on complementarily and a second group of switch elements to switch between an on state and an off state. During a dead time between drive signals for the first group of switch elements, a first target switch element in the second group of switch elements is turned on.

The invention discloses a multi-port DAB energy storage system directly connected with an elevator frequency converter bus and a cooperative control method of the multi-port DAB energy storage system, and is suitable for an elevator frequency converter direct-current bus direct-connection scene. Aiming at the defects in the aspects of elevator bus transient support, multi-branch extension and parallel operation safety access in the prior art, at least two DAB power branches are adopted, the low-voltage sides of the DAB power branches are connected into the same low-voltage direct-current source in parallel to realize current expansion, and the high-voltage sides of the DAB power branches are connected to a VFD direct-current bus through a parallel operation access switch to realize voltage expansion after being connected in series and laminated; the controller adopts fixed frequency phase shift control, and combines a two-line parallel operation or power-off time sequence and a zero-crossing residence strategy; through multi-branch phase interleaving, mutual exclusion amplitude limiting constraint, ZVS guarantee and a fault striding linkage mechanism, branch power balance, circulating current suppression and bus stable support are realized. According to the invention, the millisecond voltage of the bus can be efficiently suppressed, the response speed, the operation efficiency and the reliability of the system are improved, and the core requirements of elevator bus energy recovery and transient stability control are met.

The invention relates to an energy recovery control method based on voltage and voltage difference cooperative control. The method comprises the following steps: monitoring the direct current bus voltage of a lifting frequency converter of lifting equipment through a control monitoring unit; if the DC bus voltage exceeds a preset voltage absolute value threshold, activating voltage difference detection; after the voltage difference detection is activated, calculating a change value of the direct current bus voltage; and based on a comparison result of the change value and a preset voltage change value threshold value, controlling the energy storage unit to perform charging and discharging operation. The method has the beneficial effects that through the energy recovery control method based on voltage and voltage difference cooperation, the operation reliability of the energy recovery device of the lifting equipment is improved.