134 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.

A photovoltaic power generation system and a photovoltaic power generation system control method, to implement fast frequency support. The photovoltaic power generation system includes: a direct current converter, configured to connect an output of a photovoltaic module and perform voltage conversion on a direct current output by the photovoltaic module; an inverter, configured to convert a direct current output by the direct current converter into an alternating current and output the alternating current to a power grid; and a first controller, configured to generate a first drive signal based on two of a first voltage of the direct current of the direct current converter, an active power output by the inverter, and an operating parameter of the power grid, and control an operating state of the inverter based on the first drive signal.

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 present invention belongs to the technical field of industrial electric transmission, and specifically relates to a method for neutral point offset of a cascaded high-voltage frequency converter, the method comprising: after a power unit fails, the offset angle of each phase voltage after the neutral point offset of the DC bus voltage difference of each power unit is calculated according to the voltage amplitude of each phase, the main controller generates each phase modulation wave signal according to the offset angle of each phase voltage, the main controller compares the modulation wave signal with the triangular carrier signal to generate a PWM wave by a pulse width method, and sends the PWM wave signal to the power unit control board, the power unit control board drives the inverter circuit semiconductor power device switch to generate the required output voltage. The present invention is suitable for cascaded high-voltage frequency converter power unit fault bypass processing, and can effectively solve the problem of unbalanced three-phase output line voltage after neutral point offset.

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.

The invention relates to an inverter (1) for supplying current to an electric motor (20), in particular within a drive train (3) of an all-electric or hybrid motor vehicle (4), comprising: an inverter housing (2) inside which power electronics (5) of the inverter (1) are accommodated; an electrical input (6) for coupling to a DC voltage source (7); and an electrical output (8) for coupling to an AC voltage consumer (9), the power electronics (5) being designed to convert a DC voltage applied to the electrical input (6) into an AC voltage applied to the electrical output (8), the inverter (1) further comprising a passive EMC filter (10) and / or an active EMC filter (11), the active EMC filter (11) being located on a flexible printed circuit board (12), the flexible printed circuit board is fixed on the laminated bus bar (13).

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.

The present disclosure relates to a control device (40) for an electric vehicle (1), the electric vehicle comprising: a DC power supply (10); an electric motor (30); an inverter (20) that converts DC power supplied from the DC power supply (10) into AC power and outputs the AC power to the electric motor (30); and an inverter control unit (100) that controls the inverter (20) and controls the input voltage to the electric motor (30). When a predetermined high-frequency component is included in a parameter correlated with the input voltage, the inverter control unit (100) performs correction by adding a component that cancels the high-frequency component to the input voltage, and controls the electric motor (30) based on the corrected input voltage. Thereby, it is possible to reduce the multiple component of the electrical frequency.

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 discloses a dry-type small high-voltage modulator, and relates to the technical field of pulse power, the modulator comprises a high-voltage inversion module, a power supply module, a modulation switch module, a pulse transformer module and a control protection module, the high-voltage inversion module is used for converting input direct-current electric energy into high-frequency alternating-current electric energy; low-voltage direct current is converted into high-voltage high-frequency alternating current through internal rectification, filtering and inversion circuits; the modulation switch module is used for modulating the electric energy output by the high-voltage inversion module according to the control signal; the pulse transformer module is used for carrying out boosting and waveform conversion on the modulated electric energy and outputting high-voltage pulse electric energy; the power supply module is used for providing required electric energy for the whole dry-type small-sized high-voltage modulator; and the control protection module is used for receiving external instructions and signals and realizing control protection of each module of the dry-type small-sized high-voltage modulator and communication with an upper computer.

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.

1. The name of this design product: medium voltage inverter power unit. 2. Purpose of the product of this design: The power unit is a high-voltage inverter component that uses power electronic devices for rectification, filtering and inversion. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

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.

The invention discloses a dual-mode electrosurgical high-frequency voltage inverter and a feed-forward predictive control method thereof, and belongs to the technical field of power electronic circuits. The voltage inverter comprises a first capacitor, a second capacitor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a blocking capacitor, a high-frequency boosting transformer and a multi-channel interleaved parallel structure. The channel interleaving parallel structure comprises an interleaving parallel structure first switch tube, an interleaving parallel structure second switch tube and an interleaving parallel structure first filter inductor; the invention discloses double working modes of an electrosurgical high-frequency voltage inverter, which not only widens the voltage gain, but also improves the efficiency of the inverter when the two working modes are switched. The invention further provides a feed-forward predictive control method, the duty ratio can be rapidly calculated through predictive control, the dynamic response speed is increased, and the control precision of the output power is improved through power feedback control.

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 invention relates to an AC-DC hybrid power distribution network-based electric energy conversion method and system, the output end of a high-voltage rectification unit of a high-voltage module is connected in parallel with a high-voltage DC unit, a high-voltage inversion unit and a photovoltaic energy unit, and the high-voltage inversion unit is connected with a high-voltage AC unit; the access end of the low-voltage rectification unit of the low-voltage module is connected with an energy storage unit; the output end of the low-voltage rectification unit is connected with a transformer unit used for being connected with the access end of the high-voltage rectification unit. The new energy vehicle charging unit of the low-voltage module is connected with the transformer unit; the exchange control device is used for controlling the operation of the energy storage unit, the low-voltage rectification unit, the high-voltage rectification unit and the high-voltage inversion unit according to exchange requirements so as to convert electric energy; the structure of the formed new exchange system can convert the electric energy of photovoltaic power generation, the electric energy of vehicle charging, the electric energy stored in peak and valley and the electric energy of high-voltage alternating current and direct current in an interconnected exchanger according to needs, and the conversion and utilization rate of the electric energy is improved.

The present invention belongs to the technical field of high-voltage frequency converters, and specifically, is a high-voltage frequency converter with a water-cooling structure and a working method thereof, wherein the high-voltage frequency converter comprises a water-cooling device inside, and the water-cooling device comprises a water inlet pipe, a water outlet pipe, a water-cooling plate, a water circulation device and a cleaning device; by arranging a transverse pipe, an electromagnetic valve, a vertical pipe and a piston, the opened electromagnetic valve is suddenly closed, and the water flow will produce a water hammer effect in the transverse pipe, and the dirt on the pipe wall is separated from the pipe wall under the action of the water hammer effect; after the water flow flows smoothly, when the dirt moves to the top of the vertical pipe, the suspended dirt will fall onto the upper surface of the piston under the action of gravity; compared with the existing cleaning balls or chemical agents for cleaning the dirt in the pipe, the situation that the dirt remains in the pipe or corrodes the inner wall of the pipe is reduced, the fluidity of water in the whole water cooling process is improved, and the heat dissipation effect inside the high-voltage frequency converter is improved.

An electronic control unit (ECU) of an electric brake system and a brake system including same are described. The ECU of an electric brake system according to an embodiment of the present disclosure is an ECU including a first motor operating to generate a braking pressure in a vehicle, a valve adjusting a braking hydraulic pressure according to the operation of the first motor, a second motor operating to provide a parking braking force for the vehicle, and a driver supplying AC power for the operation of the second motor, and includes a converter converting DC power of a first voltage into DC power of a second voltage that is lower than the first voltage; an inverter inverting the DC power of the first voltage into AC power and supplying the AC power to the first motor; and a controller receiving the DC power of the second voltage and controlling at least one of the inverter, the valve, and the driver.

The invention discloses a bearingless permanent magnet thin-film motor model prediction controller in the field of motor control, which belongs to the field of motor control and is composed of a torque prediction control system and a suspension force prediction control system. The torque prediction control system comprises a torque subsystem prediction controller and a PI controller, a cost function calculation module, a cost function online optimization module and a first voltage-type inverter which are connected in series in sequence. The suspension force prediction control system comprises a suspension force subsystem prediction controller and a suspension force voltage reference generator, an SVPWM modulation module and a second voltage-type inverter which are connected in series in sequence. The output ends of the first and second voltage-type inverters are connected to the bearingless permanent magnet thin-film motor. Direct torque control is integrated with model prediction control to obtain better dynamic performance and robustness, and improve motor speed regulation and suspension performance. A control cycle is added as time compensation to predict motor parameters at time k+2, so as to avoid problems caused by delay.

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 present disclosure provides a photovoltaic system control method, device, electronic device, and readable storage medium, belonging to the technical field of photovoltaic system control. The method includes: determining the control parameters of the PID algorithm based on the voltage characteristics of the power grid; determining the control parameters of the virtual synchronous machine based on the frequency characteristics of the power grid; controlling the output voltage of the inverter in the photovoltaic system based on the control parameters of the PID algorithm, and controlling the output frequency of the inverter in the photovoltaic system based on the control parameters of the virtual synchronous machine; wherein, the output voltage of the inverter is the grid-connected voltage of the photovoltaic system, and the output frequency of the inverter is the grid-connected frequency of the photovoltaic system. The photovoltaic system control method, device, electronic device, and readable storage medium provided by the present disclosure can improve the accuracy and reliability of photovoltaic system control.

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 a high-voltage frequency converter health state monitoring system and method. The health state of a high-voltage frequency converter is monitored based on various parameters. The high-voltage frequency converter health state monitoring system comprises a data acquisition unit which acquires operation data of a plurality of parts of a high-voltage frequency converter in real time; the data preprocessing unit is used for preprocessing the data from the data acquisition unit; the characteristic quantity extraction unit is used for extracting characteristic parameters related to the health state of the high-voltage frequency converter from the data preprocessed by the data preprocessing unit; the data analysis unit is used for storing a health model which is calibrated when the high-voltage frequency converter leaves a factory and is used for establishing association between component temperature rise and electrical information, and comparing and analyzing the characteristic parameters and the stored health model to judge the health state grade of the high-voltage frequency converter; and the fault early warning unit is provided with an early warning threshold value corresponding to the health state grade, and when the health state grade of the high-voltage frequency converter is judged to reach the early warning threshold value, an early warning signal is generated and notified.