349 results about "Electric power conversion" patented technology

The invention provides a rod-pumped well working condition monitoring knowledge base construction method based on theoretical electric power reconstruction, and belongs to the technical field of oil field informatization construction. Actually-measured electric power curves of all working conditions of a rod-pumped well and corresponding oil pumping unit parameters are obtained, and an electric power historical data set is formed; establishing a relational expression among the suspension center displacement, the suspension center load, the electric power and the crank angle; establishing an electric power to suspension point indicator diagram model, and calculating a suspension point indicator diagram corresponding to the actually measured electric power curve; a theoretical indicator diagram generation method is adopted, and the suspension point indicator diagram obtained through calculation is converted into a theoretical indicator diagram; establishing a suspension point indicator diagram to electric power conversion model, and calculating a theoretical electric power curve corresponding to the theoretical indicator diagram; and extracting shape features of the theoretical electric power curve and the actually measured electric power curve, and establishing a rod-pumped well working condition monitoring knowledge base by utilizing an electric power historical data set. The theoretical electric power curve can be automatically calculated according to the actually measured electric power curve, and expert participation is not needed.

In a power conversion apparatus (1), submodules (SM) include notification units (33, 79, 44, 85) that each visually notify that a bypass switch (BPS) has been operated. The power conversion apparatus (1) is provided with: a monitoring camera (70) that collectively images the notification units of a plurality of the submodules as one image data item; and a host control device (3) that performs image processing on the image data item to thereby determine the operation state of the bypass switch (BPS) of each of the submodules.

To solve the problem that a semiconductor module cannot be improved in heat radiation performance.SOLUTION: A semiconductor module comprises: a semiconductor element; an inside conductor layer connected to one surface of the semiconductor element; an insulation plate provided by being laminated on the inside conductor layer; an outside conductor layer provided on the opposite side of the inside conductor layer across the insulation plate; and a sealing member sealing the semiconductor element, the inside conductor layer, and the insulation plate, wherein the sealing member covers the insulation plate from a side face to an outer peripheral side of the outside conductor layer, and a thin part thinner than the outside conductor layer is provided closely to the side face of the outside conductor layer.SELECTED DRAWING: Figure 2

An electric power conversion apparatus includes an inverter configured to convert input DC power into AC power, and a control device configured to control the inverter, wherein the control device is configured to prioritize limiting one of an active current and a reactive current output from the inverter over the other of the active current and the reactive current, so that an apparent current output from the inverter becomes less than or equal to a limit value.

A semiconductor device includes a first semiconductor element, a second semiconductor element, a support substrate and a sealing resin, and further includes a heat dissipation member disposed on the reverse surface. The heat dissipation member includes a plurality of first protruding elements each including a first base portion, a second base portion, a first standing portion, a second standing portion, and a first end portion. The plurality of first protruding elements are arranged in a matrix along a plane containing the first direction and the second direction.

The invention belongs to the technical field of power electronic conversion, and particularly discloses an MMC-STATCOM system direct optimization model prediction control method and system, and the method comprises the steps: respectively calculating a differential mode voltage and a common mode voltage between an upper bridge arm and a lower bridge arm of each phase; third harmonic voltage is injected into the upper bridge arm and the lower bridge arm of each phase to obtain upper bridge arm voltage and lower bridge arm voltage of a newly-added third voltage component of each phase; and based on the obtained voltage of the upper and lower bridge arms of the newly added three-time voltage component, determining the input number of the sub-modules of the upper and lower bridge arms of each phase by adopting a nearest level approximation modulation strategy, and determining the input sub-module of each bridge arm according to the capacitor voltage sequence of each sub-module of the bridge arms and the current direction. According to the method, on the basis of keeping a discrete control structure, direct injection of third harmonic voltage under an MPC framework is achieved, and higher real-time performance and expandability are achieved.

A power conversion system is provided, which system includes a first power converter including power electronic switches of a first type that are switchable to provide electric power conversion; and a second power converter connected in parallel to the first power converter. The second power converter includes power electronic switches of a second type that are switchable to provide electric power conversion. The second type is different from the first type. The second type of power electronic switches includes wide bandgap semiconductor switches. The system further includes a controller configured to operate the power conversion system in a first operating mode in which the second power converter is operated at a first switching frequency, and in a second operating mode in which the second power converter is operated at a second switching frequency of the power electronic switches and the first power converter is operated to provide power conversion.

The invention discloses an electric tricycle controller circuit board welding quality monitoring system, and relates to the technical field of welding quality monitoring, and the system comprises a power unit connected with a target electric tricycle; establishing a circuit simulation model based on the target electro-tricycle; welding quality characteristic indexes are recognized, parameter drift analysis is conducted, and a first parameter drift set is determined; performing parameter drift analysis on connection between an electric power conversion assembly in the power unit and an electric tricycle controller to obtain a second parameter drift set; and establishing a welding quality evaluation model. The technical problems that effective monitoring is lacked in the welding process of the electric tricycle controller circuit board and the welding quality cannot be accurately evaluated in the prior art are solved, and the effects of comprehensively monitoring the welding process of the electric tricycle controller circuit board, accurately evaluating the welding quality, effectively identifying potential fault points and improving the welding quality of the electric tricycle controller circuit board are achieved. Therefore, the welding quality of the power unit of the electro-tricycle is guaranteed, and the performance and reliability of the whole tricycle are improved.

A power conversion apparatus includes: an upper arm switch and a lower arm switch that are connected in series; a first capacitor electrically connected in parallel to the upper arm switch and the lower arm switch; a coil of which a first end side is electrically connected to a connection point between the upper arm switch and the lower arm switch; a second capacitor; a high-potential-side electrical path electrically connected to the upper arm switch; a low-potential-side electrical path electrically connected to the lower arm switch; and a control unit that performs switching of the upper arm switch and the lower arm switch. One of the high-potential-side electrical path and the low-potential-side electrical path and a second end side of the coil are electrically connected via the second capacitor. The other thereof and the second end side of the coil are electrically connected via a power storage unit.

The present invention provides a flying apparatus that can accurately measure a weight of a transported objected in a simple configuration. The flying apparatus 10 includes rotors 11, motors 12, a flight sensor 13, an electric power conversion unit 14, and a computation control unit 15. The flight sensor 13 measures physical quantities acting on a fuselage base portion 16. The computation control unit 15 generates instruction signals based on the physical quantities to cause the fuselage base portion 16 to be at a predetermined position in a predetermined attitude. The electric power conversion unit 14 adjusts amounts of electric power supplied to the motors 121 and the like based on the received instruction signals. Moreover, the computation control unit 15 calculates an estimated weight that is an estimation value of a weight of the transported object, based on magnitudes of the instruction signals.

The invention provides an intelligent string type energy storage system, belongs to the technical field of energy storage equipment, and solves the problem of low safety of a battery module in the prior art. The intelligent string type energy storage system comprises a battery module, an energy optimizer module, a battery cluster controller module, a distributed air conditioner module, an electric power conversion system module, an intelligent controller module and a fire extinguishing system module, the battery module comprises a shell, an installation groove is formed in the shell, a heat dissipation plate is fixedly installed in the installation groove, and the heat dissipation plate is fixedly installed in the shell. A heat conduction plate is fixedly mounted on the left side of the heat dissipation plate, limiting frames are fixedly mounted on the two sides of the heat conduction plate, a plurality of battery packs are mounted in the two limiting frames, a heat dissipation mechanism is arranged in the heat dissipation plate, and elastic mechanisms are arranged in the limiting frames. The method has the advantage that the safety of the battery module in the energy storage system can be improved.

A control unit (50) executes first control to control a primary-side full-bridge circuit (30) so that a primary-side voltage of three levels is applied to a primary-side winding (22) and also control a secondary-side full-bridge circuit (40) so that a secondary-side voltage of two levels is applied to a secondary-side winding (23) and a series connection body (24) of a reactor (L1). In the first control, the control unit (50) controls the primary-side full-bridge circuit (30) and the secondary-side full-bridge circuit (40) to achieve a combination of a first phase difference and a second phase difference that can output required electric power and that satisfy condition 1 and condition 2, and thereby outputs the required electric power.

The invention provides an off-grid hybrid electrolytic hydrogen production system. The off-grid hybrid electrolytic hydrogen production system comprises a new energy power generation unit and an energy storage unit, the electric power conversion unit converts electric energy output by the new energy power generation unit and the energy storage unit into electric energy suitable for hydrogen production, and the electrolysis unit comprises a proton exchange membrane hydrogen production module and a solid oxide electrolysis module and is used for producing hydrogen after the electric energy is introduced. And the controller controls and tracks an electric energy fluctuation value output by the new energy power generation unit through charging and discharging of the energy storage unit, so that the total electric energy fluctuation value output by the new energy power generation unit and the energy storage unit is within a set range. According to the scheme, the hydrogen production efficiency of the whole hydrogen production system can be improved, it is guaranteed that the hydrogen production system achieves off-grid operation, and the influence of power generation fluctuation of the new energy power generation unit on the hydrogen production effect is eliminated by making the total electric energy output by the new energy power generation unit and the energy storage unit fluctuate within the set range.

An electric apparatus includes: an electric power storage device; a rotary electric machine; an electric power control unit; and an angle sensor that acquires a phase of a rotor of the rotary electric machine. The electric power control unit acquires a target DC component of a current that flows through the β-phase first coil and the β-phase second coil of the rotary electric machine by electric power supplied from an external AC electric power source in accordance with a stop phase of the rotor acquired by the angle sensor at the time of stopping of the rotary electric machine and charges the electric power storage device by an electric power conversion operation based on the target DC component.

The invention provides a method and equipment, and relates to the technical field of energy management and electric power conversion, and the method comprises the steps: calculating the maximum feedback electric quantity and the optimal feedback duration according to the identity information of a feedback equipment node and a feedback capability parameter, and generating a corresponding feedback capability model; inputting the historical power consumption data, the current environment data and the regional activity data in a preset historical time period into a preset machine learning model, and outputting a power grid load curve in a future preset time period; according to a power grid load curve and a feedback capability model, dividing feedback equipment nodes into a plurality of feedback groups and distributing peak-shifting feedback time periods, and generating an initial feedback distribution scheme; and calculating a specific feedback parameter of each feedback equipment node based on the priority sequence and the feedback time window, and distributing the specific feedback parameter to the corresponding feedback equipment node. By implementing the method, power grid voltage and frequency fluctuation caused by excessive concentration of feedback electric quantity can be reduced, and the stability of power grid operation is ensured.

The invention relates to the technical field of power electronic conversion, in particular to a seamless switching control method and system for grid-connected and off-grid modes of an energy storage converter, and the method comprises the following steps: mode pre-judgment, seamless switching, virtual inertia and damping simulation and re-grid-connected pre-synchronization. The system comprises a multi-mode detection and pre-judgment module, a unified multi-mode controller, a state synchronization and observer module and a phase-locked loop-free synchronizer. According to the method, the whole process control problem from grid connection to grid disconnection and then grid connection is solved, the seamless degree of switching reaches a new level, and the active supporting capacity and friendly grid connection performance of the energy storage converter serving as a micro-grid core control unit are comprehensively improved; and the method has an important value for promoting the construction and development of a high-reliability micro-grid.

To provide technology that can improve the reliability of insulation performance of semiconductor devices.SOLUTION: A semiconductor device comprises: an adhesive provided on the edges of an insulating layer; a fixed portion fixed with the adhesive to the edge of the insulating layer; a resin case having an inner wall located above the fixed portion, and a step protruding from the inner wall and having one or more steps toward the fixed portion in cross-sectional view; and an external electrode having a first end located outside the resin case, and a second end in contact with the step.SELECTED DRAWING: Figure 2

An arrangement for electric power conversion and an electric drive comprises a power converter that includes three legs, an electric motor including three open-end stator windings respectively having first and second ends, and a power switch. The first ends of the stator windings are coupled to respective legs of the three legs of the power converter, and the second ends of the stator windings are coupled together and have a same electric potential. The power switch is configured to selectively disconnect one of the second ends of the stator windings from all other second ends to establish at most two distinct electric potentials. The at most two distinct electric potentials are coupled to respective legs of a power grid interface coupled to the arrangement.

A semiconductor drive device (10) comprises: a gate drive unit (B10) for applying a voltage to a gate terminal (G) of a semiconductor switching element (M1) on the basis of an on / off command signal; and a voltage clamp unit (20) that has a voltage drop generation circuit (21) between the output of the gate drive unit (B10) and the gate terminal (G), wherein the voltage clamp unit (20) has a control terminal (K3) for adjusting the voltage drop degree by the voltage drop generation circuit (21), and comprises a first capacitive element (22) that is connected between the control terminal (K3) and one point on the path from the output of the gate drive unit (B10) to the voltage clamp unit (20), a second capacitive element (23) that is connected between the control terminal (K3) and a reference potential (VC0), and a first electric current limiting element (24) that is connected in parallel with the first capacitive element (22) or the second capacitive element (23).

n cells (102_1-102_n) are configured to select one of, according to a switching pattern of semiconductor switching elements (107a-107d), a first operation of outputting a positive voltage with discharging or charging of a capacitor (108), an operation of outputting a negative voltage with charging or discharging of the capacitor (108) opposite to the first operation, and an operation of outputting a zero voltage without charging and discharging the capacitor (108). A controller (120) determines, from a plurality of combination patterns in which a total output voltage (Vttl) of a switching circuit (100) matches a voltage command level set according to an output voltage command value, a combination of the switching patterns of the n cells (102_1-102_n) so as to select one combination pattern in which an operation for reducing the voltage deviation with respect to the cell voltage command value is executed in a cell having a high priority in the voltage control of the capacitor (108).

The invention discloses a heat management system and an energy storage system, and belongs to the technical field of energy storage, the heat management system is applied to the energy storage system, the energy storage system comprises an electric power conversion system, the electric power conversion system is arranged in a first heat exchange medium, and the heat management system comprises a first heat exchange device and a second heat exchange device; the second heat exchange device comprises a third flow channel and a fourth flow channel, the second flow channel and the third flow channel are connected in series to form a first heat exchange pipeline, the first flow channel and the fourth flow channel are connected in series to form a second heat exchange pipeline, and the first heat exchange pipeline and the second heat exchange pipeline are used for adjusting the temperature of the power conversion system; the first electromagnetic expansion valve is used for condensing water vapor in the first heat exchange medium on the outer wall of the first flow channel; and the first driver is used for driving the first heat exchange medium. According to the heat management system, the first electromagnetic expansion valve and the first driver are combined, the dehumidification function of the heat management system under different working conditions is achieved, and it is ensured that the electric power conversion system is in a proper humidity environment.

To provide a cylinder heater capable of easily securing an installation place of an electrode for causing an electric current to flow in a cylinder liner.SOLUTION: A cylinder heater includes: an electric power conversion device that converts a DC electric current output from a DC power source into a high-frequency AC electric current; and a transformer having a primary side coil electrically connected to the electric power conversion device and a secondary side coil electrically connected to electrodes provided to correspond to one side and the other side of a cylinder liner, respectively in an axial direction of a cylinder of a cylinder block provided in an internal combustion engine. In the cylinder heater, the electrode on one side is electrically connected to a lower part of the cylinder block and the electrode on the other side is a grounding electrode of an ignition plug.SELECTED DRAWING: Figure 1

An electric power conversion apparatus includes: an electric power input terminal; an electric power output terminal; an electric power conversion circuit; a sensor circuit generating a detection voltage corresponding to a voltage at the electric power output terminal; a control circuit operable based on a first power supply voltage, including an input terminal to receive the detection voltage, and controlling operation of the electric power conversion circuit; and a power supply circuit generating the first power supply voltage and a second power supply voltage. The sensor circuit includes: resistors provided in a path coupling the electric power output terminal to a reference node, the resistors being coupled in series via first and second intermediate nodes, the second intermediate node being coupled to the input terminal; and a first diode including an anode coupled to the first intermediate node, and a cathode to be supplied with the second power supply voltage.

To provide an electric power conversion device capable of more stably supplying power to a load also in a single operation.SOLUTION: An electric power conversion device comprises: a main circuit part that converts DC power supplied from a DC power supply into AC power corresponding to a load, and supplies the AC power after the conversion to the load; and a control device that controls an operation of the conversion to the AC power from the DC power by the main circuit part. The control device includes: a voltage control device that calculates a voltage command value for outputting AC voltage of a constant magnitude in accordance with a voltage reference from the main circuit part; and an overcurrent suppression control part that determines a reduction ratio of the voltage command value calculated by the voltage control device on the basis of the magnitude of AC current of the AC power supplied to the load from the main circuit part. The overcurrent suppression control part reduces the magnitude of the AC voltage output from the main circuit part by inputting the reduction ratio at the suppression into the voltage control device when an absolute value of the magnitude of the AC current is a set value or larger.SELECTED DRAWING: Figure 1

The present invention comprises: a main converter (3) that has one end side connected to an inductor (2), and a DC positive electrode (P), a negative electrode (N), and a neutral point (O) set on the other end side; a capacitor circuit (5) that has a positive electrode terminal (P), a negative electrode terminal (N), and a neutral point (O) connected to the DC side; a sub-converter (4) that is composed of a capacitor (Csx) and a plurality of elements (Sx7–Sx10), is connected between the neutral point (O) of the capacitor circuit (5) and the neutral point (O) of the main converter (3), and in which a capacitor voltage (Vsx) changes according to a combination of opening / closing settings for the elements (Sx7–Sx10); and a control unit (6) that controls the operation of the main converter (3) and the sub-converter (4).

A switching control unit is applicable to an electric power conversion apparatus. The electric power conversion apparatus includes: a transformer; an inverter circuit including first switching devices; a synchronous rectifying circuit including second switching devices serving as rectifying devices; and a smoothing circuit. The switching control unit includes: a first current detection circuit detecting a peak current value of a secondary current; a second current detection circuit detecting an output current value; and a control circuit controlling respective operations of the first switching devices of the inverter circuit and respective operations of the second switching devices of the synchronous rectifying circuit. The control circuit sets a timing of switching from an on-state to an off-state of each of the second switching devices based on the peak current value detected by the first current detection circuit and the output current value detected by the second current detection circuit.

An electric power conversion system comprising: an alternating current (AC) source comprising a plurality of AC terminals for conducting AC power; a voltage source electrically coupled to the AC terminals; and a controller operably coupled to the voltage source, the controller being configured to: operate the voltage source to apply a fault reducing voltage at the AC terminals that reduces an AC line-to-line fault current (If).

The invention discloses a generator parallel operation control method and system based on carrier synchronization, and belongs to the technical field of power electronic conversion. A generator parallel operation control method based on carrier synchronization is characterized in that the method is applied to a system comprising a synchronous enabling unit, a synchronous signal transmitter and a plurality of parallel converters connected with the synchronous enabling unit and the synchronous signal transmitter respectively, and the method comprises the following steps: for each converter, determining a counting difference value and sending the synchronous enabling unit; the synchronous enabling unit feeds back an adjusting signal to the corresponding converter based on a comparison result of the difference value sent by the carrier wave processor of each converter and a count value threshold until the difference values sent by the carrier wave processors of all converters are smaller than the count value threshold; then, synchronous enable signals are sent to the converters respectively; and each converter drives the IGBT to realize current conversion based on the synchronous enable signal. According to the method, synchronous impact and circulation are reduced by simulating dynamic approximation of a carrier and an actual carrier.

The invention discloses a grid-connected converter voltage support control method based on near-end information estimation, and belongs to the technical field of grid-connected conversion. The control strategy technology comprises the following steps: (1) grid-connected point voltage estimation; (2) generating a reactive instruction; and (3) current loop control. Compared with the prior art, the grid-connected point information can be estimated only by sampling the machine side current and the capacitor voltage, the hardware cost of a sampling circuit is saved, communication delay is avoided, and the rapidity and precision of voltage support are guaranteed.

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".