90 results about "Voltage inverter" patented technology

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 relates to the technical field of photovoltaic inverter grid connection, and discloses a photovoltaic panel assembly insulation impedance fault positioning method, a storage medium and a system. Comprising the steps of collecting voltage between positive and negative electrodes of an inverter under first voltage, voltage to ground of the negative electrode of the inverter and a direct-current component of leakage current of an output end, close to a power grid side, of the inverter; collecting the voltage between the positive electrode and the negative electrode of the inverter under the second voltage after voltage disturbance, the voltage to ground of the negative electrode of the inverter and the direct-current component of the leakage current of the output end, close to the power grid side, of the inverter; calculating a first insulation resistance value corresponding to the plurality of photovoltaic panel assemblies under the first voltage, and calculating a second insulation resistance value of the plurality of photovoltaic panel assemblies under the second voltage; and according to the first insulation resistance value and the second insulation resistance value, positioning the photovoltaic panel assembly with the insulation resistance abnormity. According to the invention, the accurate positioning of the insulation fault of the photovoltaic panel assembly level is realized, and the specific photovoltaic panel assembly with the insulation abnormity can be accurately identified from the series photovoltaic string.

The invention discloses a method and system for applying vector control to a generalized frequency conversion system. The method comprises the steps that stator flux linkage orientation parameters and torque control parameters are generated according to high-voltage power grid operation parameters collected in real time and an obtained torque instruction; the target slip rate of the motor is dynamically determined through a slip rate limiting module so as to ensure that the inverter works in a power output or absorption safety interval; according to the target slip ratio and the torque control parameter, a rotor side voltage waveform is generated through an inverter, vector control is carried out on a motor rotor, and the torque and the rotating speed of the motor are adjusted; the stability of the system is monitored in real time through the stability augmentation device, the critical stable, over-stable or under-stable state is compensated, and the control parameters or the power grid frequency are adjusted to maintain stable operation of the system. According to the method, the variable-frequency variable-torque control precision and the response speed which are equivalent to those of a traditional high-voltage frequency converter system are achieved, and an efficient, economical and reliable speed regulation solution is provided for a power plant auxiliary engine system.

1. Name of the designed product: single-phase low-voltage inverter. 2. Use of the designed product: used for converting variable current voltage generated by photovoltaic solar panels into single-phase alternating current. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view 1.

The invention discloses a novel vehicle-mounted high-voltage inverter power supply system, which is characterized by comprising a bidirectional DC / DC module, a bidirectional DC / AC inverter, a control unit and a filtering unit, the control unit is connected with the filtering unit through the bidirectional DC / DC module. The control unit is connected with the filtering unit through the bidirectional DC / AC inverter. And the bidirectional DC / DC module is electrically connected with the bidirectional DC / AC inverter.

1. The name of the design product: ultra-thin vehicle-mounted high-voltage inverter. 2. The use of the design product: inverter for automobile. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.

Power control device (10), comprising: a first smoothing capacitor (30) configured to smooth the output of a high-voltage battery (1) of a vehicle; a boost converter (40) configured to boost a voltage smoothed by the first smoothing capacitor (30); a second smoothing capacitor (50) configured to smooth the output of the boost converter (40); an inverter unit (60) to which a voltage smoothed by the second smoothing capacitor (50) is input; a gate control unit (80) configured to perform a discharge operation to discharge the first smoothing capacitor (30) and the second smoothing capacitor (50); a backup power supply unit (70A, 70B) connected to the first smoothing capacitor (30) or the second smoothing capacitor (50) and configured to supply power to the gate control unit (80); and an output voltage switching unit (100) configured to adjust the voltage of the backup power supply unit (70A, 70B) during normal operation to be equal to or lower than a voltage supplied to the gate control unit (80) from an auxiliary battery (3), and to switch the voltage of the backup power supply unit (70A, 70B) during discharge operation by the gate control unit (80) to be equal to or higher than the voltage supplied from the auxiliary battery (3).

The invention provides a CAES and high-voltage frequency converter integrated multi-time scale energy collaborative optimization method. The method comprises the following steps: collecting and preprocessing multi-source heterogeneous data; non-uniform time weighted orthogonal decomposition NTW-POD is adopted to extract thermal gradient features, a thermal-electric-mechanical coupling relation is established, and multi-time scale data fusion is realized; constructing a dual-time scale frame with a physical model and residual error separation, and accurately evaluating the influence of the thermal characteristics of the frequency converter on the CAES compression efficiency; and generating an energy optimization scheduling strategy considering the thermal state of the frequency converter based on a thermal state evaluation result. Through thermal gradient feature extraction and multi-scale data fusion, the dynamic nonlinear coupling problem of the thermal characteristics of the frequency converter and the CAES compression efficiency is solved, and the system energy conversion efficiency and the equipment reliability are improved.

A kind of AC power supply system for power supply end can be grounded, in the scheme, the input end of power electronic transformer is connected with medium-high voltage network, and the output end is connected with the low-voltage DC bus;The input end of the low-voltage inverter DC / AC device is connected with the low-voltage DC bus, and the output end is connected with low-voltage AC load and grounded;Multiple non-isolated DC / DC device input end is connected in parallel to the low-voltage DC bus, and the output end is respectively connected with low-voltage DC load.In the scheme, three-phase four-wire or three-phase five-wire system is constructed in AC power supply side, the problem of lack of ground line system when three-phase three-wire system inverter is powered is solved.In addition, star-connected capacitor is installed on the output side of low-voltage inverter DC / AC device and connected with the input side of non-isolated DC / DC device, low-impedance loop of common-mode voltage is constructed, common-mode voltage from DC side to AC side can be effectively suppressed, and the problem of common-mode voltage of non-isolated AC power supply circuit being too large to interfere with power supply process is solved.

1. The name of the design product: inverter (single-phase low-voltage inverter LS2). 2. The use of the design product: energy storage inverter. 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 generator inverters, in particular to a double-voltage inverter, which comprises a power plug, a permanent magnet motor, a rectifier bridge, a protection circuit, a filter voltage stabilizing circuit and a power amplification circuit. The rectifier bridge comprises an inductor L1, an inductor L2, a transistor Q1, a transistor Q2, a transistor Q3 and a transistor Q4, the inductor L1 is connected with a live wire of the power plug, the inductor L2 is connected with a neutral wire of the power plug, one end of the transistor Q1 and one end of the transistor Q2 are respectively connected with the inductor L1, one end of the transistor Q3 and one end of the transistor Q4 are respectively connected with the inductor L2, and the inductor L2 is connected with the neutral wire of the power plug. And the other end of the transistor Q1 is connected with the other end of the transistor Q3, and the other end of the transistor Q2 is connected with the other end of the transistor Q4, so that the problems of complex structure and electronic circuit, high cost, large size and heavy weight of the existing double-voltage inverter motor of the generator are solved.

The present invention discloses a method for synchronous control between multiple high-voltage frequency converters. Each power unit collects the A, B, and C three-phase bus voltage values ​​of each high-voltage frequency converter in real time and uploads the collected bus voltage values ​​to a control board connected to the power unit. The control board estimates the actual voltage of the motor connected to each high-voltage frequency converter. Based on the estimated motor voltage and the collected motor current, the control board calculates the motor's active current. Based on the detected active current, the control board calculates the appropriate dynamic rate of change of speed to control the frequency converter to output the appropriate frequency value. Compared with the existing technology, the present invention completely does not rely on speed sensors. Each high-voltage frequency converter is independently controlled based on its own detected motor voltage and motor current signals, meeting the requirements of controlling multiple motors on a belt.

1. Name of the product in this design: Large single-phase high-voltage inverter. 2. Purpose of this design: To convert the variable current and voltage generated by a photovoltaic solar panel into single-phase alternating current. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

This invention discloses a motor redundancy control system suitable for manned electric helicopters. The system includes: a current sensor, a three-phase voltage sensor, a motor position sensor, an inverse converter module, a motor control algorithm module, a current fault diagnosis and reconstruction module, a Clarke voltage inverter module, a speed and position monitoring module, and a position / speed signal fault diagnosis and reconstruction module. Applying this system ensures the flight safety of manned electric helicopters, preventing crashes due to power loss. This control system primarily addresses the current and position sensors, which are prone to failure during cruise in manned electric helicopters. Different redundancy control methods are proposed for each. When current and position sensors malfunction, the system can quickly diagnose the fault and reconstruct the position and current information using position and current reconstruction methods respectively. The fault information is then uploaded to the flight assistance display and control system to alert the pilot, allowing for an emergency landing at a suitable location, thus ensuring the stable operation of the manned electric helicopter's motor control system.

The invention relates to the technical field of frequency converter maintenance, and discloses a diagnosis and maintenance method for a high-voltage frequency converter, which comprises the following steps: S1, pre-checking a fault, and checking power supply, appearance and wiring of a power grid; s2, static test: detecting a rectification circuit, an inverter circuit and a control circuit when the power is not on; s3, dynamic testing is carried out, three-phase voltage and current waveforms are detected after power-on, and an I-GBT driving signal is monitored; s4, performing fault judgment, and performing fault classification in combination with a test result and an error code; s5, implementing maintenance, and replacing or repairing a damaged component according to a fault; and S6, recovering and optimizing the system, testing and optimizing parameters after maintenance, and starting a monitoring system to record data. Through the diagnosis and maintenance method combining static and dynamic tests, each circuit of the high-voltage frequency converter can be comprehensively detected, so that a potential fault source can be quickly found, the accuracy of fault positioning is greatly improved, and the problem of missing detection caused by incomplete tests is avoided.

A voltage balancer and a method of driving the same are provided. The method includes sensing a first voltage between two terminals of an inverter, a second voltage between one of the two terminals of the inverter and a neutral point located between the two terminals of the inverter, and a third voltage between the other of the two terminals of the inverter and the neutral point based on a power supply system is in an off-grid state; turning on at least one switch pair among a plurality of switches included in the voltage balancer based on the first voltage; controlling a duty ratio of each driving switch that is not turned on among the plurality of switches, based on a result of comparing the second voltage with the third voltage; and driving each driving switch based on the controlled duty ratio.

The utility model relates to the technical field of insulation detection, and discloses a vehicle-mounted high-voltage inverter power supply insulation detection device which comprises an insulation detection starting circuit, an insulation resistance detection circuit and a detection feedback circuit. The insulation resistance detection circuit comprises a first resistance voltage division loop and a second resistance voltage division loop, and the detection feedback circuit comprises a signal processing circuit and a sound-light alarm loop. According to the utility model, the connection or disconnection of the first resistance voltage division loop and the second resistance voltage division loop is controlled to realize the unbalanced bridge of the insulation resistance detection circuit, and the voltage values of the two resistance voltage division loops are read through the signal processing circuit, so that the insulation resistance values R + and R-of the high-voltage inverter power supply to be detected are calculated. The circuit has the characteristics of light weight, miniaturization and fast response speed, a sampling loop is isolated from a signal loop through signal processing, and the sampling precision is improved. And the unbalanced bridge for detecting the insulation resistance is realized by controlling the relay, so that the detection accuracy is improved.

The invention relates to the field of driving circuits, in particular to a multifunctional driving circuit comprising a voltage conversion module comprising a converter; the positive and negative voltage conversion module comprises a charge pump voltage inverter; the operational follower module comprises an operational amplifier; the access switch module comprises a triode, an OR gate circuit and a P channel mosfet; the voltage conversion module is electrically connected with the positive and negative voltage conversion module and the path switch module through the positive and negative voltage conversion module, and the voltage conversion module is connected with the positive and negative voltage conversion module in series; the positive and negative voltage conversion module is connected in parallel with the operational following module and the path switch module, and the voltage conversion module further comprises two decoupling capacitors which are used for filtering power supply noise, stabilizing power supply voltage and providing transient current compensation; the converter is a direct current-direct current converter or a linear voltage-stabilized power supply. According to the multifunctional driving circuit provided by the invention, the size of a driving circuit module is reduced.

The application relates to the technical field of new energy power system control, and relates to a grid-connected new energy reactive power fast response control method and system based on a non-singular fast terminal sliding mode control. Active power and reactive power of a power grid side are collected to input a virtual synchronous machine control, voltage reference values and phase angle reference values are calculated, the voltage reference values and the phase angle reference values output by the virtual synchronous machine control are combined into three-phase voltage, and the output current and voltage of an inverter are converted into d-axis current and voltage and q-axis current and voltage through coordinate conversion; the d-axis current and the q-axis current are input into adaptive virtual impedance control to obtain d-axis reference voltage and q-axis reference voltage; voltage and current double-loop control is carried out according to the d-axis reference voltage and the q-axis reference voltage to generate SVPWM signals. The application realizes fast, low overshoot and zero static error reactive step response under a weak grid condition.

Power control system (12) of a hybrid vehicle (10), wherein the system comprises: a battery (28), a converter (46) that converts a DC voltage from the battery (28) into a DC voltage with a different level by switching switching elements and then outputs the converted voltage, a converter (44) that converts an output of the converter (46) into an electric motor drive current, an electric motor (24) which is driven by the electric motor drive current from the inverter (44), a control device (32) which, when there is a warm-up request for the battery (28), causes the first to fourth carrier frequencies (F1, F2, F3, F4), which are carrier frequencies in the switching control of the switching elements, to be lower than a normal carrier frequency (FA), which is a carrier frequency in the case where there is no warm-up request for the battery (28), and a machine (20), wherein the hybrid vehicle (10) drives using the electric motor (24) and / or the machine (20) as a power source, The first carrier frequency (F1) is a carrier frequency when there is a warm-up request when the machine (20) is in operation, and when there is an acceleration request. The second carrier frequency (F2) is a carrier frequency when there is a warm-up request when the machine (20) is in operation, and when there is no acceleration request. The third carrier frequency (F3) is a carrier frequency when there is a warm-up request, the machine (20) is not in operation, and when there is an acceleration request, and The fourth carrier frequency (F4) is a carrier frequency when there is a warm-up request, the machine (20) is not in operation, and when there is no acceleration request. where the first carrier frequency (F1) is smaller than the second carrier frequency (F2), the second carrier frequency (F2) is smaller than the third carrier frequency (F3), and the third carrier frequency (F3) is smaller than the fourth carrier frequency (F4).

The invention discloses a wide input voltage inverter system with a dynamic regulation function and a working method, and particularly relates to the technical field of electric power and industrial control, and the wide input voltage inverter system is characterized in that based on a unified timestamp and a ring cache, standardized observation with observation confidence is acquired and solidified as a unique data entry; and generating a boundary vector which can be directly called through combined observation. The system combines a parallel operation graph model and link quality, on the premise that an external interface is not changed, security layer projection and time domain smoothing are carried out on reference quantity and parameter increment, and small-step consistency constraint is applied; and performing differential setting according to the scene or mode labels. Monitoring is executed, judgment is carried out around deviation, boundary approximation and saturation signs, graded degradation such as limited power, bandwidth shrinkage, freezing consistency updating, non-impact switching or ordered shutdown is carried out according to a set sequence, and ordered recovery is carried out after hysteresis and residence conditions are met; statistical feedback is used for updating a cross-cycle confidence coefficient and conservative degree base line, and safe operation under the complex parallel operation working condition is achieved.

A vehicle-to-load discharge (V2L) converter for a vehicle includes a high voltage battery unit configured to provide electric power for an electric vehicle, a DC / DC converter unit configured to convert the provided electric power into a voltage such that a voltage output is a constant voltage, a DC / AC inverter unit configured to convert the DC / DC converter unit to the voltage output, and a burst circuit unit configured to charge the DC / AC inverter unit. The DC / AC inverter unit includes a plurality of field effect transistors (FETs) and is configured to perform power transmission and control corresponding to the converted constant voltage by a switching operation, and the burst circuit unit is configured to change the switching operation per unit time of the DC / AC inverter unit at the time of an overload operation.

1. Name of the product in this design: Dual-voltage frequency converter housing (digital generator). 2. Application of this design: This design is used for the housing of a dual-voltage digital generator frequency converter. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The invention relates to a motor driving device and an air conditioner having the same. A motor driving device according to an embodiment of the present invention comprises: a rectifying unit that rectifies a three-phase AC voltage; a capacitor for storing the pulsating voltage from the rectifying unit; a first voltage detection unit that detects the ripple voltage stored in the capacitor; a harmonic reduction unit that is disposed between the rectification unit and the capacitor, has at least one switching element and a second capacitor, and performs harmonic reduction of the three-phase AC voltage; a current detection unit that detects a current flowing in the harmonic reduction unit; a second voltage detection unit that detects a voltage across the second capacitor in the harmonic reduction unit; an inverter having a plurality of switching elements and outputting the converted AC voltage to the motor using the voltage across the capacitor; and a control unit that controls the harmonic reduction unit on the basis of the pulsating voltage from the first voltage detection unit, the detected current from the current detection unit, and the detected voltage from the second voltage detection unit.

The invention relates to an instant-combustion type pulse ignition controller for timing or dry-burning-resistant valve closing of a gas cooker. The instant-combustion type pulse ignition controller comprises a direct-current power supply, an oscillating circuit, a high-voltage generating circuit, a time delay circuit, a voltage inverter, a first suction valve time delay circuit, a second suction valve time delay circuit, a first thermocouple double-coil electromagnetic valve and a second thermocouple double-coil electromagnetic valve, one end of the oscillating circuit is used for being connected with an ignition switch of the gas cooker, the other end of the oscillating circuit is connected with the high-voltage generating circuit, the high-voltage generating circuit outputs high-voltage pulses for igniting the cooker, one end of the time-delay circuit is connected with the high-voltage generating circuit, and the other end of the time-delay circuit is connected with the voltage inverter. The output end of the voltage inverter is connected with a first suction valve time-delay circuit and a second suction valve time-delay circuit which are connected in parallel, and the two thermocouple double-coil electromagnetic valves are controlled to be opened or closed through the two suction valve time-delay circuits. The valve can still be effectively opened under the condition that the negative electrode of the power supply is grounded, and the double functions of opening the valve through instant combustion and simply and reliably closing the valve are achieved.

The invention relates to the technical field of high-voltage frequency converters, in particular to a remote fault monitoring method and system for a high-voltage frequency converter. Comprising the steps of setting a plurality of monitoring points based on equipment parameters and historical fault parameters; constructing an initial operation model and a monitoring sub-strategy of each monitoring point, and collecting a feedback data packet of each monitoring point according to all the monitoring sub-strategies; generating a fault risk value of each monitoring point according to the feedback data packet and the initial operation model, and judging whether an early warning instruction is generated or not according to the fault risk value; a plurality of monitoring points are set according to the historical fault data of the high-voltage frequency converter, and the corresponding initial operation model is constructed according to the fault characteristic parameters of each monitoring point, so that comprehensive monitoring of the high-voltage frequency converter is realized, early warning of the abnormal operation state of the high-voltage frequency converter is performed in time, and the diagnosis efficiency of potential faults of the high-voltage frequency converter is improved.

The utility model discloses a typical scene battlefield environment setting control platform which comprises a digital master console, a remote control delay exploder combination, a sound controller and a forward and reverse rotation controller. The digital master console comprises four Darlington driving chips, 54 paths of remote transmitters with a reverse display function, 51 paths of signal receivers and a forward and reverse rotation and electromagnetic wave transmitting module, and a detonation main control board, a detonation remote receiving control board, a high-voltage inverter and a detonation storage battery are arranged in a box body of the high-voltage pulse delay detonation device. The sound controller comprises a sound main control board, a sound storage battery, a sound remote receiving module, a sound receiving signal processing module, a volume adjusting module and a digital audio module. The forward and reverse rotation controller comprises a forward and reverse rotation main control board, a forward and reverse rotation remote receiving module, a forward and reverse rotation receiving signal processing module and a forward and reverse rotation module. According to the utility model, all-directional, multi-angle and all-time monitoring of training states of all scenes can be realized, remote control is realized, battlefield conditions are set along with mechanisms, and a battlefield atmosphere is created.

The invention discloses a power take-off power generation and power supply system for a high-power engine. The power take-off power generation and power supply system comprises a high-power power take-off power generation device, a system controller, a high-voltage inverter, an energy storage battery box, an integrated high-voltage power distribution and transformation power transformation system, a cooling heat dissipation device and the engine. A power take-off power generation system is conveniently and additionally arranged on a vehicle without a power take-off power generation structure, and the generated power is higher than that of a belt power take-off scheme. The engine power take-off power generation and power supply system is wide in adaptability and can be additionally arranged on various vehicles provided with common engines theoretically, and due to the fact that fans and connecting structures of the fans and engine crankshafts are designed at the front ends of engines of most vehicles, the economical efficiency of the vehicles is improved; the engine load rate of the engine under the low load condition can be improved through the power take-off generator, and then the working efficiency of the engine is improved; and on the other hand, after the structure is additionally arranged, other accessories adopting belt power take-off of the original vehicle can be all canceled.

A motor drive circuit (2) includes an inverter circuit (4) having a switching element and an inverter protection circuit (1), the inverter circuit (4) generating a drive voltage to be applied to a motor (M). An inverter protection circuit (1) is provided with: a first resistor (R1) connected between an inverter circuit (4) and a positive-side power supply line (7) that supplies a constant voltage to the inverter circuit (4); a first detection circuit (11) that outputs a first detection signal (E1) indicating that a ground fault or an inter-phase short circuit has been detected on the basis of the current flowing through the first resistor (R1); and a first protection circuit (12) that cuts off the supply of a signal for driving the switching element on the basis of the first detection signal (E1).

The present invention relates to the technical field of fault diagnosis of power electronic equipment, and specifically discloses a fault analysis and diagnosis method and system for a high-voltage frequency converter for mining. The method collects the skin effect depth and parasitic parameter drift under high-frequency working conditions in real time through a multi-physics field sensor array; constructs the three-dimensional current density distribution of the conductor based on the non-Euclidean space grid partitioning technology, and dynamically corrects the conductor equivalent resistivity in combination with the metamaterial database to calculate the dynamic eddy current loss eigenvalue; utilizes the quantum annealing algorithm to optimize and solve the time-varying evolution equation of the parasitic parameter to obtain the voltage spike sensitivity eigenvalue; inputs the eigenvalue into a pre-trained deep residual shrinkage network diagnostic model for multimodal fusion analysis, and outputs the fault risk assessment result; finally, implements hierarchical protection according to the assessment result. The present invention innovatively solves the problem of modeling the time-varying characteristics of parasitic parameters in a vibration environment, and realizes early warning of hidden faults.