690 results about "Transverter" patented technology

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 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 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.

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.

The invention provides a frequency converter embedded current waveform analysis method and system and a medium, and relates to the technical field of current waveform analysis, and the method comprises the steps: obtaining a sampling circuit configured in a current path of a frequency converter; calculating the required total gain based on the original output voltage signal of the sampling resistor and the required input voltage of the analog-to-digital converter; the signal quality of the original output voltage signal is evaluated, the required total gain is dynamically distributed to an instrument amplifier and a programmable gain amplifier, the original output voltage signal is amplified and then passes through an analog-to-digital converter, and current waveform data is obtained for current anomaly analysis; when the signal quality is lower than a first threshold value, the gain share of the instrument amplifier is increased preferentially; when the signal quality is higher than a second threshold, the gain share of the programmable gain amplifier is increased preferentially. According to the invention, the technical problem of low accuracy of current waveform analysis in the prior art can be solved, and the technical effect of improving the accuracy of waveform analysis is achieved.

The invention belongs to the technical field of electrical engineering, and particularly relates to a dynamic intelligent control method and system for a variable-frequency speed regulation system, and the method comprises the steps: in the offline stage of the system, automatically setting the total rotational inertia and the optimal compensation gain of the system through injecting a test torque and monitoring critical oscillation; in the online operation stage, active electromagnetic power is calculated by collecting bus voltage and current, theoretical inertia power is calculated by combining mechanical angular velocity, and the difference value of the active electromagnetic power and the theoretical inertia power is used as a disturbance power observation value after low-pass filtering; a singular-point-free equivalent angular velocity is constructed by using a set minimum effective rotating speed threshold value, disturbance power is converted into disturbance torque, and the zero-division singular problem of a low-speed region is effectively avoided; and calculating a compensation current, carrying out dynamic amplitude limiting according to the residual current margin of the frequency converter, and superposing the residual current to a speed ring for output. According to the method, the problem of calculation divergence of traditional power disturbance observation in a low-speed region is solved, and disturbance suppression and robust control in a full-speed region are realized on the premise of ensuring system safety.

The invention relates to the technical field of electrical safety, and particularly discloses an arc fault protection method based on a circuit breaker intelligent algorithm, which comprises the following steps: S1, collecting a line current signal in real time, eliminating harmonic interference of a frequency converter from an original signal through an anti-aliasing filter, and converting the original signal into a digital signal; s2, processing the current signal by adopting a three-stage cascade wavelet analysis module, and outputting a dynamic peak-to-average ratio to S4; s3, detecting current disturbance based on a double-slide-rail window, outputting a disturbance positioning mark and a time-frequency feature to S4, judging a disturbance event, and positioning a starting point; s4, receiving the dynamic peak-to-average ratio of the S2 and the disturbance positioning mark and the time-frequency characteristics of the S3, performing path processing according to a characteristic analysis result, and adopting a direct interruption method and an electromagnetic radiation-current frequency domain cross validation method; s5, constructing an electric arc energy accumulation prediction model; according to the invention, the problems of weak arc leak detection, electromagnetic interference maloperation and delay are solved.

The utility model provides an automatic vibration fruit shaking machine, and relates to the technical field of fruit harvesting. The automatic vibration fruit shaking machine comprises a rack, a walking mechanism, a clamping mechanism, a vibration mechanism, a collecting mechanism, an environment information collecting mechanism and a control mechanism. The control mechanism comprises a first control assembly and a second control assembly. The second control assembly is used for identifying fruit tree trunks, obstacle identification and path planning. The clamping mechanism comprises a first lead screw sliding table module, a bus steering engine and a mechanical clamping jaw. The first lead screw sliding table module is used for longitudinally moving the mechanical clamping jaw. The bus steering engine is used for driving the mechanical clamping jaw to open and close. The vibration mechanism comprises a frequency converter electrically connected to the first control assembly and a vibration motor. The collecting mechanism comprises a second lead screw sliding table module connected to the rack, a telescopic support connected to the second lead screw sliding table module and a collecting net connected to the telescopic support. The second lead screw sliding table module is constructed to be capable of driving the telescopic support to be opened or closed so as to drive the collecting net to be opened or closed.

The utility model provides a power unit and a frequency converter having the same, the power unit comprises an inversion module, a rectification module, a first capacitor module and a second capacitor module, the inversion module and the first capacitor module are arranged side by side, and the rectification module and the second capacitor module are arranged side by side; one part of the first busbar is connected with the inversion module, and the other part of the first busbar is connected with the first capacitor module; one part of the second busbar is connected with the rectifier module, and the other part of the second busbar is connected with the second capacitor module. According to the technical scheme provided by the utility model, the technical problem that the assembling mode of the power unit in the prior art is relatively complex can be solved.

drive comprising an electric motor supplied by an inverter (6), wherein the converter (6) has an inverter (12) which has a DC-side connection and an AC-side connection, where a series circuit is supplied from the DC-side connection and the motor is supplied from the AC-side connection, wherein the series circuit has a resistance and a controllable semiconductor switch (11) for controlling the current flowing through the series circuit, wherein the voltage available at the DC-side connection of the inverter (12) is detected, characterized by the fact that - a comparator is set up in such a way and is operatively connected to a controllable semiconductor switch (11) such that an output signal of the comparator controls the controllable semiconductor switch (11), wherein the comparator is set up and is in operative connection with a utilization determination device (21) such that the output signal is also supplied to the utilization determination device (21) and the utilization determination device (21) determines a signal value from it, - the resistance has a braking resistance (1), - the comparator is set up in such a way that it monitors the recorded voltage value for exceeding a first threshold and falling below a second threshold, - the utilization determination device (21) has a counter whose counting direction depends on the value of the detected voltage and / or on the control signal (4) provided for the controllable semiconductor switch (11), - the utilization determination device (21) is set up such that a respective counting speed is provided during downward counting depending on the signal value.

The invention discloses a biomass new energy manufacturing PLC integrated control system, which comprises a PLC main control unit, a touch screen operation interface, a sensor system, a frequency converter, a protection device and an actuator, and is characterized in that the PLC main control unit accurately controls each link through data acquisition and processing, the touch screen is used for real-time interaction with an operator, and the sensor system is used for monitoring the operation of the operator. The sensor system comprises a temperature sensor, a pressure sensor, a flow sensor and a current sensor and can monitor the equipment state in the production process in real time. By integrating a plurality of hardware devices such as the PLC, the touch screen and the temperature and humidity sensor, centralized control in the biomass energy production process is realized. The time delay and coordination problems caused by decentralized control can be effectively reduced, the operation efficiency of the system is improved, and real-time data acquisition, data processing and feedback control technologies are adopted. The system can automatically monitor equipment states, such as temperature, pressure, flow, rotating speed and the like, optimizes the production process through a PID (Proportion Integration Differentiation) adjustment algorithm, and realizes intelligentization and automation of production links.

This down-converter device (21, 22, 23) comprises a band limiting filter (32, 43, 53) and a Farrow structure filter (33, 44, 54). The band limiting filter (32, 43, 53) suppresses the frequency bands of a portion of an input signal. The Farrow structure filter (33, 44, 54) converts the sample rate of a signal output from the band limiting filter (32, 43, 53). The band limiting filter (32, 43, 53) suppresses at least a portion of the frequency bands excluding a frequency band to be extracted.

The utility model discloses a misconduction control circuit, an inverter, a frequency converter and a frequency conversion electric appliance. The error conduction control circuit is applied to the inverter, the inverter comprises a plurality of inverter bridges, each inverter bridge comprises an upper bridge arm switch tube and a lower bridge arm switch tube, and the error conduction control circuit comprises clamping modules which are arranged in one-to-one correspondence with the lower bridge arm switch tubes, the first end of the clamping module is connected with the source electrode of the lower bridge arm switch tube, and the second end of the clamping module is connected with the grid electrode of the lower bridge arm switch tube. According to the utility model, the voltage difference between the grid electrode and the source electrode of the lower bridge arm switch tube can be prevented from exceeding the conduction threshold value of the lower bridge arm switch tube, so that the lower bridge arm switch tube is prevented from being mistakenly conducted when the lower bridge arm switch tube does not need to be conducted, and the short circuit caused by simultaneous conduction of the upper bridge arm switch tube and the lower bridge arm switch tube of the same inverter bridge is avoided; and the reliability and the stability of the inverter circuit are improved.

The present application relates to the technical field of equipment state monitoring, in particular to a device state monitoring and intelligent early warning method based on edge computing, comprising collecting the nameplate text and control parameters of frequency converters, motors, pump groups and other equipment, splitting fields and judging component relationships, generating component calibration lists; combined with register addresses and other screening binding points, obtaining edge state sequences; verifying start-stop, steering and temperature rise states according to time stamps, obtaining alarm approval lists; combining position and time sequence to merge alarms, establishing early warning trigger lists; writing edge side early warning output tables and hanging state labels, generating state early warning information. The present application screens and binds key measuring points, realizes stable correspondence between data and components; synchronously aligns operating parameters based on time stamps and jointly judges start-stop, steering and temperature rise relationships, improves state recognition consistency; combines spatial position and time interval to group and merge alarms, forms a continuous alarm structure that can be positioned, and enhances early warning integrity.

The utility model discloses a cooling device for a frequency converter of an induced draft fan, which is used for a frequency converter chamber and comprises an airflow pipeline and a cooling module. The airflow pipeline comprises a first airflow pipeline and a second airflow pipeline which are mutually independent, the first airflow pipeline is used for discharging hot air in the frequency converter chamber, and the second airflow pipeline is used for introducing external cold air into the frequency converter chamber; the cooling module is connected to the first airflow pipeline and the second airflow pipeline. The cooling module is provided with an air inlet connected with the first airflow pipeline and an air outlet connected with the second airflow pipeline, a heat exchange channel is formed between the air inlet and the air outlet, and a first cooling assembly located on the heat exchange channel and a second cooling assembly independent of the first cooling assembly are arranged in the cooling module. The second cooling assembly is located outside the heat exchange channel. Compared with the prior art, by arranging the cooling module, hot air can be changed into cold air through internal circulation, and the temperature in the frequency converter chamber is ensured.

The invention relates to the technical field of chemical engineering, in particular to an interlocking protection method for a dry acetylene carbide crushing system. According to the technical scheme, the interlocking protection method for the dry acetylene carbide crushing system comprises a real-time operation state monitoring and data acquisition method; according to the method, seven quantitative indexes such as mechanical part abrasion loss detection, frequency converter parameter calibration and nitrogen replacement system verification need to be completed before starting, and it is ensured that equipment is in the optimal initial state; during shutdown, through operations of confirming closing of a stock bin flashboard through a position sensor, controlling stopping time of a rotating part through inertia braking, cleaning a screen mesh through a high-pressure air gun and the like, through combination with a double-confirmation mechanism of a final equipment state signal and a communication state, hidden dangers in the start-stop stage are thoroughly eliminated, and the non-planned shutdown frequency of equipment is reduced by more than 60%; meanwhile, the service life of key parts is prolonged, and the maintenance cost caused by improper start and stop is reduced.

1. The name of the design product: industrial fan (12025). 2. The use of the design product: used in new energy industry, industrial industry, server and frequency converter to adjust air flow. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The utility model relates to the technical field of cables, and discloses a mining coal mining machine frequency conversion cable, which comprises a sheath assembly, a filling layer is fixedly connected in the sheath assembly, a wire assembly is fixedly connected in the filling layer, the wire assembly comprises a plurality of insulating layers, and the insulating layers are arranged in the sheath assembly. The exteriors of the plurality of insulating layers are fixedly connected to the interior of the filling layer, conductors are fixedly connected to the interiors of the insulating layers, a plurality of power lines are fixedly connected to the interior of the filling layer, a plurality of ground wires are fixedly connected to the interior of the filling layer, and a plurality of signal lines are fixedly connected to the interior of the filling layer. And a plurality of shielding wires are fixedly connected in the filling layer. According to the utility model, crosstalk of electromagnetic interference generated in the transmission process of the power line to the signal line is effectively reduced, accurate transmission of control signals is guaranteed, and when the temperature of the cable rises abnormally, the frequency converter can be linked to stop, thereby avoiding faults or fire disasters caused by overheating of the cable.

This application discloses a wind tunnel-based noise detection method, apparatus, storage medium, and electronic device. The method includes: when testing a test piece in a wind tunnel, acquiring a measured noise spectrum in the testing environment and obtaining the operating frequency of the wind tunnel's inverter; matching the background noise spectrum corresponding to the operating frequency in a background noise spectrum library based on the operating frequency; aligning and dividing the measured noise spectrum and the background noise spectrum using a frequency band division rule adapted to the inverter's operating frequency to obtain multiple frequency band units; based on the acoustic energy density of the measured noise spectrum and the background noise spectrum within each frequency band unit, extracting the energy component corresponding to the background noise spectrum from the measured noise spectrum through directional orthogonal projection, and reconstructing the spectrum of the residual energy after extraction to obtain the effective aerodynamic noise spectrum of the test piece; and calculating the noise detection result of the test piece based on the effective aerodynamic noise spectrum.

To provide an inverter setup method capable of easily setting a control parameter of an inverter which may be limited by a combination of a motor and the inverter.SOLUTION: Extracting first identification information that is identification information of a motor 1 from a first nameplate image obtained by photographing a nameplate of the motor 1, and extracting second identification information that is identification information of an inverter 2 that controls a rotation speed of the motor 1 from a second nameplate image obtained by photographing a nameplate of the inverter 2; The control parameter associated with the combination of the first identification information and the second identification information is extracted from the database using the database 36 in which a plurality of control parameters associated with each combination of the identification information of the motor and the identification information of the inverter are stored, the first identification information, and the second identification information, and the setting of the inverter is changed based on the extracted control parameter.SELECTED DRAWING: Figure 6

1. Name of the product in this design: Frequency converter (A66 high protection). 2. Application of this design: for use in industrial frequency converters. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

To realize suitable operation according to on a load level of an inverter in a compressor.SOLUTION: A compressor 1 comprises a motor 30, an inverter 40 that controls the motor 30, a compressor body 20 that is driven by the motor 30 and compresses fluid, a load level determination unit 51 that determines a load level of the inverter 40, and a rotation speed adjustment unit 52 that adjusts an acceleration or deceleration of the motor 30 based on the load level determined by the load level determination unit 51.SELECTED DRAWING: Figure 1

The invention provides a frequency converter heat dissipation device and method for improving air suspension, and relates to the field of frequency converter heat dissipation, and the device comprises a positioning installation housing, a frequency converter main body, a water cooling heat dissipation plate, a cooling liquid flow guide pipe, spiral turbulent flow fins, and a heat dissipation fan. The frequency converter main body is in bolted connection with the left side of the positioning mounting shell; the water-cooling heat dissipation plate is fixedly connected to the inner side of the frequency converter main body; the cooling liquid flow guide pipe is fixedly connected to the inner side of the water-cooling heat dissipation plate; the spiral turbulent flow fins are welded to the inner side of the cooling liquid flow guide pipe. The cooling fan is in bolted connection with the lower part of the frequency converter main body; blockage caused by scale deposition on the inner wall of the pipeline is avoided, the heat dissipation efficiency of the frequency converter is improved, equipment faults caused by overheating are reduced, the overall service life of the frequency converter and the air suspension fan is prolonged, continuous and stable operation of the air suspension fan is guaranteed, and the problem that after a water pipe conveys cooling liquid for a long time, scale appears on the inner wall of the water pipe, and the service life of the water pipe is prolonged is solved. And the water pipe is easily blocked.

This application relates to the field of air conditioning technology, and more particularly to an outdoor unit. The outdoor unit of this application has a cooling channel constructed within the motor housing of the compressor, and a mounting cavity is formed by providing a mounting shell on the motor housing. The inverter includes a first part and a second part. The first part is arranged within the mounting cavity, and heat dissipation is achieved using the cooling channel and the thermal conductivity of the motor housing. The second part is arranged independently of the motor housing. The first part includes an inverter module and a filter capacitor. The inverter module generates a significant amount of heat and is in contact with the motor housing, ensuring effective heat dissipation for the inverter module and improving its heat dissipation efficiency, thus preventing the temperature of the filter capacitor from being affected by insufficient heat dissipation from the inverter module. The filter capacitor generates less heat and is located on the side of the inverter module away from the motor housing. The remaining cooling capacity after heat exchange with the inverter module via the refrigerant channel is used to dissipate heat from the filter capacitor, ensuring its service life and reducing maintenance frequency.

The utility model discloses a frequency converter output overcurrent protection circuit comprising a reference power supply circuit used for stably outputting a 5V voltage; the current sampling circuit is used for collecting the IGBT output current and converting the IGBT output current into a voltage signal to be output; the comparison circuit is used for comparing the acquired voltage signal with a set value and then outputting a level signal; and the buffer circuit is used for acquiring the level signal and outputting a VCE signal. According to the frequency converter output overcurrent protection circuit, output current is detected through the current detection circuit, the comparator is used for comparing real-time current values and controlling output overcurrent signals, and the phase inverter is used for carrying out waveform shaping on the output signals, so that the integrity of the signals is ensured.