197 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 provides a permanent magnet synchronous motor speed regulation system variable universe fuzzy PI control method and system, and relates to the technical field of motor speed regulation system control. The motor rotating speed deviation is determined; current controller parameters are adjusted based on the rotating speed deviation, and a q-axis current given value is obtained; converting the three-phase current into a two-phase static coordinate system; converting the static coordinate system current into a rotating coordinate system; d-axis current and q-axis current are adjusted respectively, and d-axis reference voltage and q-axis reference voltage are obtained; converting the d-axis reference voltage and the q-axis reference voltage into a static coordinate system; modulating the voltage of the static coordinate system to obtain an inverter control signal; and outputting an inverter control signal to the three-phase voltage inverter to drive the permanent magnet synchronous motor to operate. Compared with a traditional fuzzy PI controller, the method has the advantages of being rapid in speed response, small in torque pulsation, high in control precision and high in disturbance rejection capacity.

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 embodiment of the present invention discloses a photovoltaic grid-connected inverter and a control method thereof, and the control method of the photovoltaic grid-connected inverter includes: obtaining the working parameters of the inverter; the working parameters include at least one of the bus sampling voltage, the output power of the inverter, and the input voltage; judging whether the inverter meets the preset conditions according to the relationship between the working parameters and the corresponding preset parameters; wherein the preset conditions are used to determine the preset working mode of the inverter; if the inverter meets the preset conditions, the current working mode of the inverter is switched to the preset working mode. The technical solution provided by the embodiment of the present invention can give full play to the performance advantages of the inverter by quickly switching the working mode to carry out targeted control, so that the inverter can balance the input and output power in time when power limitation or recovery is performed, and is conducive to improving work efficiency, reducing inverter stress, enhancing system stability and reliability, and reducing hardware costs.

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 provides a high-voltage inverter temperature anomaly warning system and method, which relates to the field of electronic technology, including: an edge data collector, which is used to continuously collect and monitor the working temperature of a high-voltage inverter and the ambient temperature of the environment in which it is located, and upload them to a cloud-based remote intelligent operation and maintenance platform; the cloud-based remote intelligent operation and maintenance platform reads all the working temperatures and the ambient temperatures of the day at preset time intervals, and processes them to obtain a temperature rise value, and saves the temperature rise value; the cloud-based remote intelligent operation and maintenance platform reads each of the temperature rise values ​​of a preset number of days before the day and processes them to obtain an average temperature rise value, and each time the temperature rise value is greater than the average temperature rise value and the difference is greater than a threshold and continues for a preset number of times, a temperature anomaly warning signal is generated and sent to the corresponding mobile terminal; the beneficial effect is to give users sufficient time to carry out corresponding processing, prevent unplanned shutdowns of production enterprises, and reduce user losses.

A high-voltage frequency conversion system for starting permanent magnet synchronous motors comprises a high-voltage frequency converter and switching equipment, a plurality of 6kV power switch cabinets, permanent magnet synchronous motors A-F and a unit DCS control system, and the high-voltage frequency converter and switching equipment comprises a high-voltage frequency converter I, a high-voltage frequency converter II, an isolating switch QS21, an isolating switch QS22, an isolating switch QS23 and vacuum contactors KM11-KM16. The isolation switches are QS11 to QS16; starting and switching control commands of the high-voltage frequency converter and the switching equipment are from a unit DCS (Distributed Control System); the beneficial effects of the utility model are that the high-voltage frequency converter and the switching device can achieve the purpose of starting six permanent magnet synchronous motors in sequence, thereby saving the initial investment cost of the device; the high-voltage frequency converter I and the high-voltage frequency converter II are standby for each other, normal starting of the permanent magnet synchronous motor is not affected when one frequency converter breaks down, and the reliability of the starting system is high; the switching logic of the starting system of the permanent-magnet synchronous motor is clear and easy to realize.

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 multi-voltage inverter welding machine control circuit power supply method and an inverter welding machine, relates to the technical field of welding, and designs a power supply circuit, a driving circuit, an inverter circuit and a power supply transformer which are connected in sequence. Rectifying and filtering, BUCK voltage reduction and BUCK-BOOST conversion are sequentially carried out on the low-voltage alternating current to generate stable positive and negative power supply voltage to supply power to the driving circuit; a driving circuit is utilized, a PWM control strategy based on phase shift driving is adopted to drive an inverter circuit to operate, and the inverter circuit converts stable direct current in a main loop of the multi-voltage inverter welding machine into stable alternating current according to the PWM control strategy; the converted stable alternating current is connected to the primary side of the power transformer, and the secondary side of the power transformer supplies power to a control circuit and auxiliary tools of the multi-voltage inverter welding machine. According to the invention, only one power supply circuit is additionally arranged, so that stable power supply for the multi-voltage inverter welding machine is realized.

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 invention discloses a condensation protection control method and device, a high-voltage frequency converter and a storage medium, and relates to the technical field of frequency converters, and the method comprises the steps: obtaining a condensation detection signal of the high-voltage frequency converter; when it is determined that the condensation phenomenon exists in the high-voltage frequency converter according to the condensation detection signal, the high-voltage closing state of the high-voltage frequency converter is determined; under the condition that the high-voltage switching-on state is switched on, the current dehumidification suppression condition of the high-voltage frequency converter is determined according to the fault detection signal of the high-voltage frequency converter; and if the dehumidification suppression condition is that the dehumidification means is not enough to suppress condensation, controlling the high-voltage frequency converter to execute high-voltage tripping. According to the invention, condensation protection is provided for the high-voltage frequency converter, and irreversible damage caused by high voltage on the high-voltage frequency converter in a condensation state is avoided.

An electric power conversion device (100) comprises: a rectification unit (12) that rectifies a power supply voltage; an inverter (15) that converts the rectification voltage rectified by the rectification unit (12) into a drive voltage; a detection unit (20) that detects a physical quantity correlated with a common mode current flowing through the inside of the electric power conversion device (100); a compensation current generation unit (30) that generates, on the basis of the physical quantity detected by the detection unit (20), a compensation current for cancelling the common mode current; and an injection unit (40) that injects the compensation current into the ground potential. The magnitude Z1 of the ground impedance of a load unit, including the inverter (15) and a load (60), and the magnitude Z2 of the ground impedance of the injection unit (40) are set with respect to a voltage V1 between the DC buses (71, 72) connecting the rectification unit (12) and the inverter (15), and an operating voltage V2 for operating the compensation current generation unit (30) so as to satisfy a first impedance constraint condition represented by the relation "V1 / Z1 < V2 / Z2".

The utility model discloses a new energy vehicle power supply circuit system which comprises a high-voltage inverter, the input end of the high-voltage inverter is connected with an original vehicle 220V socket, and the output end of the high-voltage inverter is connected with the input end of a CDU power distribution system. The output end of the high-voltage inverter is connected with the input end of the DC-DC inverter and one end of the double-storage-battery isolator, the output end of the DC-DC inverter is connected with an air conditioner equipment circuit, and the other end of the double-storage-battery isolator is connected with the input end of the additionally-installed auxiliary battery pack and the input end of the ACC power line switch. The output end of the additional auxiliary battery pack is grounded, and the output end of the ACC power line switch is connected with power supply equipment in a vehicle. Different from a common mode of taking electricity from a main storage battery 12 / 24V low voltage of an engine compartment, the circuit takes electricity from an original 220V high-voltage circuit of a new energy automobile chassis and converts 12V low voltage to supply electricity to an auxiliary storage battery and equipment in the automobile, the equipment in the automobile can be supplied with electricity more adaptively and stably, and the power supply requirement of the equipment in the automobile can be met as much as possible.

The present invention relates to the technical field of frequency converter control cabinets, and in particular, to a high-voltage frequency converter control cabinet with a protective function, including a control cabinet, and the left and right side walls of the cabinet are symmetrically provided with ventilation windows, and the ventilation windows are provided with a high-temperature protection component for cooling the control cabinet; the high-temperature protection component includes a plurality of windshields regularly arranged between the front and rear side walls of the ventilation windows, a wind direction adjustment structure, a wind hood whose inner end is connected to the corresponding side ventilation windows, and an air inlet tube whose inner end is connected to the outer end of the wind hood. By providing the high-temperature protection component, the control cabinet can cool down the interior by suction when the temperature inside the cabinet is too high. At the same time, by providing the windshield and the wind direction adjustment structure, the wind direction of the incoming air can be changed to avoid cooling only a fixed position; in addition, by providing the cleaning component, the grille can be cleaned during the suction cooling to avoid the blocking of debris that causes the ineffective air intake and affects the cooling effect.

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 medium voltage direct-hung DC power supply belongs to the field of power electronics. The power supply includes two converters and an output filter capacitor C o The two converters are converter No. 1 and converter No. 2. Converter No. 1 and converter No. 2 use the same circuit topology and control method. Each converter consists of a medium voltage rectifier circuit, a medium voltage inverter circuit, a single-phase transformer, a low voltage rectifier circuit and an output filter capacitor C. o1 Composition. The power supply uses a diode valve group and a thyristor valve group to bear current and transmit power, and adjusts the output voltage and transmission power by controlling the voltage at both ends of the bridge arm in series with the submodule; the structure of two converter outputs in parallel significantly improves the transmission power of the power supply, and at the same time, the medium voltage side is directly connected to the power grid, with a simple structure and high ease of use. The present invention has the advantages of a small number of devices, high power density, low cost, a wide output voltage range, and fault current limiting capability, and is also suitable for data centers, electric vehicle charging stations, hydrogen production and other fields.

A method for controlling an AC electric motor by means of a voltage inverter with a plurality of electrical switches having on-off states, which together define a plurality of non-zero vectors arranged perpendicularly around a common origin, includes, by means of one or more controllers, calculating a three-phase voltage reference vector that is applied to the AC electric motor by means of the voltage inverter. The method also includes calculating the switching times of the voltage inverter by means of one or more controllers using a first subset of the plurality of non-zero vectors, wherein the first subset contains fewer than all of the plurality of non-zero vectors and no adjacent non-zero vectors, to synthesize the three-phase voltage reference vector.Additionally, the procedure includes applying the three-phase voltage reference vector to the AC electric motor using the voltage inverter.

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.

The utility model relates to the technical field of medium-voltage frequency converter surface assembly component surface mounting, in particular to a medium-voltage frequency converter surface assembly component surface mounting machine, which is convenient to move and support the whole, is convenient to adjust the horizontality, is convenient to clean dust on a surface mounting table, and is convenient to use. The practicability and the surface mounting quality are improved; comprising a chip mounting table; the device further comprises a supporting adjusting mechanism, a moving mechanism, a reinforcing mechanism, a position adjusting mechanism, a cleaning mechanism and a processing mechanism, the moving mechanism is installed at the bottom end of the supporting adjusting mechanism, the reinforcing mechanism is installed on the moving mechanism, the position adjusting mechanism is installed at the top end of the supporting adjusting mechanism, and the cleaning mechanism is installed on the position adjusting mechanism.

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.