41results about How to "Achieve pressure equalization" patented technology

The invention provides a capacitor voltage balance control method based on bundling type switching of multiple sub modules. By means of a bundling mode, the quantity level of the sub modules of a modularization multi-level converter valve is degraded for one level, lowering of the capacitor voltage balance control calculated amount is facilitated, and the requirements for control equipment are lowered. After the sub modules are bundled into a module group, switching is conducted overall, the voltage balance of the sub module group is achieved by using a capacitor voltage balance algorithm, voltage-sharing is achieved on the inner portion of the sub module group through self-adaptation, and total voltage-sharing of the sub modules can be achieved. By means of the capacitor voltage balance control method based on bundling type switching of the multiple sub modules, the problem of the control of a high-capacity voltage source converter based high voltage direct current converter valve based on a modularization multi-level converter mode can be effectively solved, and controlling and monitoring of the converter valve with large-scale amount can be achieved.

The invention discloses a voltage-equalizing and power-equalizing control method for a three-phase multi-module cascade solid-state transformer. A three-phase SST system power main circuit part applied in the method comprises an input stage, an intermediate stage and an output stage, wherein a control policy based on three-phase d-q-0 vector control is adopted in the input stage, a common duty ratio control policy is adopted in modules in the same phase so as to achieve the unit power factor of an input end of an electric network; a control policy based on voltage feedforward and voltage feedback is introduced for each module in the intermediate stage, the voltage feedforward is used as a reference of the voltage feedback, and an error between the voltage feedforward and the voltage feedback is used as a reference of an inner current loop of each module after being output by a voltage PI adjuster. The two control policies of the front stage and the intermediate stage interact so as to achieve the functions of voltage and power equalization of each SST module, electrical network side unit power factor, high electrical network current sine degree, low switching tube voltage stress and the like.

The invention discloses a lightning-protection method and a voltage-sharing lightning-protection device for a transmission line composite insulator, the device comprises: a first subpart of the voltage-sharing lightning-protection device is installed at one side of the composite insulator, wherein the first subpart comprises a first electrode with a protruding end, and the first subpart has the voltage-sharing capacity; while a second subpart of the voltage-sharing lightning-protection device is installed at the other side of the composite insulator, wherein the second subpart comprises a second electrode with a spherical end, and the second subpart has the voltage-sharing capacity; wherein, the first electrode and the second electrode construct a parallel connection gap. The method and the device of the invention realize dual functions of voltage sharing and lightning-protection for the composite insulator, prevent the metal at the end of the composite insulator from being burned by electric arc and effectively prevent the composite material from burning and damaging.

The invention discloses a cell voltage equalizing control method using a dynamic reference in a storage battery field. Each cell monomer in a series battery is connected in parallel with an equalization module. A charger is used to charge the series battery. A total output voltage of the battery is sampled in real time. Each monomer voltage of the battery is detected and a reference voltage reference is calculated. When the cell monomer voltage is higher than the reference voltage reference, the corresponding equalization module stops working. When the cell monomer voltage is lower than the reference voltage reference, the equalization module charges the corresponding cell monomer so that voltages of all the cell monomers are equalized. When one cell monomer voltage reaches a monomer protection voltage point, the charger stops charging the battery and each equalization unit continues to carry out boosting charge on the needed monomer till that all the monomer voltages reach the monomer protection voltage point or the monomer voltages are equalized. Output voltages of the equalization units are the same so that a consistency of a final cell voltage is ensured and an equalization effect is good.

The invention discloses an IGBT (insulated gate bipolar transistor) series connection voltage balancing control method and belongs to the technical field of power electronic conversion. The method includes: utilizing an active clamping circuit equipped for each IGBT to extract working voltage spike signals of each IGBT; combining with a comparison circuit to acquire voltage spike actual lasting time value; utilizing time information acquired by detection, combining with an adjusting scheme designed in an optimized manner according to actual series connection working characteristics of each IGBT to adjust driving signal edge of each IGBT, and realizing voltage balancing of the IGBTs after adjusting for several times. The voltage balancing control method is suitable for part of mesohigh-power IGBTs, and the adjusting mode is designed according to actual working characteristics of the IGBTs, so that the method is simple and easy to realize, and quickness of series connection voltage balancing of the IGBTs can be improved while high stability is guaranteed.

The invention provides a constant value pressure-reducing real-time sampling valve. The constant value pressure-reducing real-time sampling valve is composed of an upper body, a lower body and an electromagnetism switch valve, the upper body is connected with the lower body through threads, a liquid inlet, a liquid outlet and a control liquid channel are formed in the upper body, a valve core, a spring and a baffle ring are arranged in the upper body, the valve element is fabricated in a valve cavity, and the spring is mounted in the valve core and pressed against the baffle ring; and a sampling opening and a control liquid channel are formed in the lower body, an electromagnetism switch valve and an end cover are mounted on the lower body, a piston and a push bar are arranged in the lower body, the piston is connected with the push bar through bolts, and the piston is arranged in a piston cavity. According to the constant value pressure-reducing real-time sampling valve, the problem that on-site operation of real-time sampling of well cementation system cement slurry, drilling slurry and the like is inconvenient is solved, and the structure is simple, installation is convenient, operation is flexible, and labor intensity of workers is relieved greatly.

The invention discloses a power converter with multiple parallel inputs and multiple series outputs, the power converter comprising a switching network (1), an inductance-capacitance combination module (2), a transformer module (3), a rectifier module (4) and a filter module (5), wherein the switching network (1), the inductance-capacitance combination module (2), the transformer module (3), the rectifier module (4) and the filter module (5) are sequentially connected; the switching network (1) comprises a plurality of identical switching circuits in parallel; the transformer module (3) comprises a plurality of transformer groups, the transformer groups comprise a plurality of identical transformers with primary windings connected in parallel, and the transformer groups are connected withthe switching circuits correspondingly; the rectifier module (4) comprises a rectifying circuit, which is a series rectifying circuit; secondary windings of the corresponding transformers in the plurality of transformer groups are connected in series, and the secondary windings are connected in series and then are connected to the series rectifying circuit for rectification.

The invention discloses a DC bus capacitor voltage equalizing device. A DC bus capacitor comprises N capacitor bodies which are connected in series, wherein N is an integer larger than 1. The voltage equalizing device comprises N LLC resonant converters and a Buck circuit, wherein the N capacitor bodies which are connected in series are correspondingly connected with the N LLC resonant converters in a one-to-one mode, the output ends of the N LLC resonant converters are connected in parallel, and the N LLC resonant converters work at respective series resonance points; the Buck circuit is connected with the output ends of the N LLC resonant converters, and the Buck circuit is used for conducting closed-loop regulation on the N LLC resonant converters to output stable DC voltage. The voltage equalizing device can equalize voltage of the DC bus capacitor and is low in energy loss.

The invention relates to pressure control equipment for a fuel cell, and belongs to the field of associated equipment of a fuel cell, in particular to auxiliary pressure balance equipment for a fuel cell used in the field of new energy automobiles. The pressure control equipment comprises a tubular shell, wherein a first isolation part and a second isolation part are arranged in the shell; the inside of the shell is partitioned into a fuel gas cavity, an air cavity and a pressure-regulating cavity; the fuel gas cavity and the pressure-regulating cavity are sealed and isolated through the movable first isolation part; the air cavity and the pressure-regulating cavity are sealed and isolated through the movable second isolation part; the fuel gas cavity is used for communicating with a fuel gas source; the air cavity is used for communicating with an air source; the pressure-regulating cavity is used for communicating with an inflating and deflating device. In the structure, the pressure difference between the fuel gas cavity and the air cavity can be balanced in real time through the principle that the first isolation part and the second isolation part can move under the pressure difference; moreover, the air pressures in the fuel gas cavity and the air cavity can be regulated to a required air pressure range in real time through the pressure-regulating cavity; the pressure-regulating cavity is connected to the two sides of the fuel cell, so that pressure keeping and pressure balancing in the fuel cell are realized.

The invention discloses a neutral point static clamping voltage-sharing circuit for a three-level inverter. The neutral point static clamping voltage-sharing circuit comprises a stack structure of four transistors, wherein a node A is at the joint of the first transistor and the second transistor; a node C is at the joint of the second transistor and the third transistor and serves as a voltage output end; a node B is at the joint of the third transistor and the fourth transistor; direct-current voltage DC+ and direct-current voltage DC- are connected at two ends of the stack structure of fourtransistors respectively; a series capacitor C1 and a series capacitor C2 in parallel to the stack structure of four transistors are connected between the direct-current voltage DC+ and the direct-current voltage DC-; and a parallel circuit is connected between the node A and the node B. The voltage uniformity of the insulated gate bipolar transistors can be guaranteed at static state, overvoltage breakdown damage is prevented, the circuit is simple, reliable, stable in operation and small in occupied space, any type and specification of the insulated gate bipolar transistor of any type and specification can be protected by adjusting the resistance value of a resistor R, and the circuit has great application prospects.

The invention provides a pre-charging method and system for a hybrid direct current converter. The pre-charging method comprises the following steps: establishing a ring current voltage for an alternating current output unit and a high-voltage sub-module string of the hybrid direct current converter; when the circulating current voltage and the capacitor voltage of the alternating current output unit and the high-voltage sub-module string are stable, generating a circulating current control voltage, and balancing the sub-module capacitor voltage of the alternating current output unit and the high-voltage sub-module string; and after the AC output unit and the sub-module capacitor voltage of the high-voltage sub-module string are balanced, generating a DC control voltage, so that when the AC output unit and the sub-module capacitor voltage of the high-voltage sub-module string continuously rise to a rated voltage, pre-charging is ended. According to the invention, voltage sharing of internal modules of the auxiliary converter can be slowly realized, after voltage sharing of the sub-modules in the auxiliary converter is completed, the direct current side current can be controlled for further charging, and finally all the sub-modules can reach rated values.

The invention provides a multi-port grid-shaped modularized multi-level direct-current converter. According to the multi-port grid-shaped modularized multi-level direct-current converter, the connection mode that completely same non-isolated DC-DC converter modules are connected in parallel at the same stage and the output ends of the DC-DC converters at different stages are sequentially connected in series is adopted, and Buck-Boost modules are selected as single DC-DC converter modules; the multi-port converter generally has a relatively strong coupling effect between ports, so that each DC-DC converter further comprises a control loop, so that multi-port decoupling control can be realized. The modules in the converter have identical circuit structures and electrical parameters, standardized production and assembly can be realized, and current sharing and voltage sharing among the modules can be realized. According to the multi-port grid-shaped modularized multi-level direct-current converter topological structure, on the basis of meeting port characteristic requirements and device voltage and current stress balanced distribution, the optimal design of minimum filling of the number of modules in a grid structure is achieved, and flexible expansion of the number of ports, the voltage level and the power capacity can be achieved.

The invention discloses a production method of a low-temperature plasticized fiber composite material and a product thereof, and the method comprises the following steps: step 1, adding a polycaprolactone raw material into a drying box, drying the raw material at 30-50 DEG C, and putting a fiber raw material into the drying box, and drying the fiber raw material at 110-130 DEG C; step 2, adding 0.03-0.04% of a cross-linking sensitizer into the dried polycaprolactone raw material, and stirring the raw material in a high-speed stirrer to obtain a polycaprolactone mixture; step 3, mixing the polycaprolactone mixture and the dried fiber raw materials according to a mass ratio of 1:0.4-1:1.2, carrying out high-temperature fusion, and cooling the mixture to obtain a composition sheet; step 4, carrying out radiation crosslinking treatment on the composition sheet to crystallize the polycaprolactone polymer, so as to obtain the low-temperature plasticized fiber composite material with high hardness at normal temperature. The material can be used for manufacturing insoles of high-heeled shoes.

The invention relates to the technical field of power electronic conversion, in particular to a switch power source of an output ripple suppression circuit topological structure. The switch power source comprises a power circuit and an output circuit connected to an output end of the power circuit. The switch power source is characterized by further comprising a filter, a first control loop and asecond control loop, the filter is connected between the power circuit and the output circuit, and an input end of the first control loop is connected with the output circuit while an output end is connected with the filter; the first control loop is used for acquiring voltage of the output circuit, comparing with a set value and taking an obtained error value as a reference to control a stable value of the filter; the second control loop is used for acquiring voltage at two ends of the filter to take as a reference, comparing with a set value and controlling output voltage of the power circuit. By adding of a filter circuit to output of the switch power source and current sharing of the filter circuit, output voltage stable control and ripple suppression are realized through two-stage control loops.

The invention discloses an automatic stress gradient loading device. The device comprises a rigid frame, wherein four rigid loading side plates are arranged in the rigid frame, a square loading cavityis defined by the four rigid loading side plates, the rigid frame is further provided with end covers for sealing two ends of the square loading cavity, a force transmission assembly is mounted in the loading cavity in a matched mode, a cylindrical sample loading cavity is formed in the middle of the force transmission assembly, the force transmission assembly comprises an elastic cylindrical sleeve, an elastic circular truncated cone arranged outside the elastic cylindrical sleeve in a sleeving mode and a square elastic body arranged outside the elastic circular truncated cone in a sleevingmode, and the force transmission assembly further comprises a loading system arranged in the rigid frame and used for applying the force to the four rigid loading side plates. The device has the characteristics of simple structure, convenience in operation and capability of realizing gradient loading of the axial stress of the sample.

The invention relates to a high and low voltage compatible wireless power transmission system and a manufacturing method of a resonant inductor integrated transformer thereof. The system comprises a transmitting coil end and a receiving coil end, the receiving coil end further comprises a resonant inductance integrated transformer, a primary winding of the resonant inductance integrated transformer is connected with the receiving end LCC compensation network, and a secondary winding of the resonant inductance integrated transformer is connected with the receiving end rectifier bridge. The leakage inductance of the primary winding of the resonant inductance integrated transformer replaces the compensation inductance of the LCC compensation network at the receiving end to enable the receiving coil end to reach a resonant state at a rated frequency, and the transformation ratio of the primary winding and the secondary winding of the resonant inductance integrated transformer is changed to be compatible with a rechargeable battery charged at high and low voltages. The beneficial effects are that the resonant inductor integrated transformer replaces a resonant compensation inductor to realize impedance matching, and the charging requirements of different voltage levels are met.

The invention provides a high-voltage isolation transformer with a combined insulation structure and belongs to the technical field of isolation transformers. The high-voltage isolation transformer comprises a bottom plate, an insulating sleeve, a top plate and a grading ring; the insulating sleeve is coiled to form a cylinder with an internal mounting space; a transformer assembly is suitable forbeing arranged in the mounting space; and an insulating gas is suitable for being accommodated in the insulating sleeve. According to the high-voltage isolation transformer of the invention, a mode combining gas insulation and solid insulation is adopted, wherein the gas insulation is used as the main insulation for high-voltage isolation, and the gas insulation is used as auxiliary insulation for improving the surface insulation characteristic of the transformer. The high-voltage isolation transformer can be flexibly expanded to high-voltage isolation transformers with voltage classes of more than 35kV. Compared with a conventional dry-type transformer, the high-voltage isolation transformer of the invention has the advantages of higher insulating strength, low partial discharge suppression, low noise and high heat dissipation. The application of the isolation transformer under direct-current high voltages of 100KV or more can be realized; and the long-term reliable application of the isolation transformer under direct-current voltages or alternating-current voltages is realized.

The invention belongs to the multi-level active neutral point clamping inverter technology, and specifically relates to a multi-level active neutral point clamping inverter series IGBT voltage equalization circuit, which is characterized in that it includes active neutral point clamping A single bridge arm of a five-level inverter and a converter; the single bridge arm of the active neutral point clamped five-level inverter includes a switch tube S1 and a switch tube connected in series between the positive terminal of the power supply and the negative terminal of the power supply S2, switch tube S4, switch tube S3, switch tube S3, switch tube S4, switch tube S2, switch tube S1; between the collector of switch tube S4 and the emitter of switch tube S4, switch tubes S5, Switch tube S6, switch tube S6, switch tube S5. For a single bridge arm of an active neutral-point clamped five-level inverter, a single-input, double-output isolated power supply is used to generate the clamping voltage of the IGBT in series, and the input-to-output ratio of the converter is 4:1:1. After the voltage, the IGBTs running in series can realize dynamic and static voltage equalization.

The invention relates to an opening and closing method of a submarine carrying aircraft launching canister valve mechanism, and relates to the technical field of launching. By means of the method, according to a command of control equipment on a submarine, normal opening / closing are achieved, seawater enters a launching canister after opening is carried out, and seawater pressure equalizing of a front cover of the launching canister is achieved.

The invention discloses a voltage-equalizing and power-equalizing control method for a multi-module cascade solid-state transformer (SST). An SST power main circuit part applied in the method comprises an input stage, an intermediate stage and an output stage, wherein a common duty ratio control policy based on single-phase d-q vector control is adopted in the input stage so as to realize the unit power factor of an input end of an electric network; a control policy based on voltage feedforward and voltage feedback is introduced for each module in the intermediate stage, the voltage feedforward is used as a reference of the voltage feedback, and an error between the voltage feedforward and the voltage feedback is used as a reference of inner current loop of the module after being output by a voltage PI adjuster. The two control policies of the front stage and the intermediate stage interact so as to realize the functions of voltage and power equalization of each SST module, electricalnetwork side unit power factor, high electrical network current sine degree, low switching tube voltage stress and the like.

The present invention provides a press machine having a pressure equalizing device and a pressure equalizing device. The press machine having a pressure equalizing device comprises a rack, a pluralityof pressing plates mutually arranged at intervals at the rack in the pressing direction, a drive device and a pressure equalizing device. The pressure equalizing device comprises a base arranged at the drive device and having a chamber, and a plurality of pressure units arranged at the installation surfaces of the base, the installation surfaces correspond the pressing plates in the pressing direction, each pressure unit comprises a pressing cavity communicating with the chamber and a piston penetrating the opening end of the pressing cavity and closing the opening end, the opening end is opened facing the pressing plates, the piston can be movably arranged at the opening end in the pressing direction and push against the pressing plate located in the nearest position, the pressing cavities and the chamber commonly form a closed liquid space, the drive device can drive the pressure equalizing device to push against the pressing plate located in the nearest position. When the liquid space is fully filled with liquid, the hydraulic pressure of the piston can be the same, thereby achieving the pressure equalization effect.

The present application provides a converter arm, a series-connected high-voltage DC transformer, and a control method. The head end of the converter arm is connected to the DC positive pole, the tail end is connected to the DC negative pole, and the middle point leads out as the AC end of the converter arm. The converter arm includes at least one energy consumption unit and at least one voltage equalizing unit; capacitor, the first power semiconductor device, and the third power semiconductor device and the fourth power semiconductor device connected in series, and the other end of the third power semiconductor device is connected to the connection between the third power semiconductor device and the fourth power semiconductor device of the adjacent voltage equalizing unit point or energy consumption unit; one end of the first DC capacitor is connected to the connection point of the third power semiconductor device and the fourth power semiconductor device, one end of the first power semiconductor device is connected to the other end of the first DC capacitor, and the other end of the first power semiconductor device is connected to the first power semiconductor device. At the other end of the four power semiconductor devices, the first power semiconductor devices of all the voltage equalization units are connected in series in the same direction.

The invention discloses a voltage-sharing method of an IGBT (insulated gate bipolar transistor) serial connection opening process, and belongs to the technical field of power electronics conversion. The voltage-sharing control method utilizes an opening process active clamping circuit configured to every IGBT, increases a simple isolation detecting circuit and detects voltage reduction moment of an IGBT set emitter. The FPGA is used for performing information treatment on a returning signal of the detecting circuit, extracting delay time numerical value of the opening process of every IGBT, and applying these time information to adjust the rising edge of the IGBT driving signal; after adjusting for many times, the voltage sharing of every IGBT is realized. The voltage-sharing control method proposed in the invention is applicable to a part of middle and high voltage power IGBT; the method is simple and easy to practice; besides, the method has the advantages of realizing the voltage-sharing speedability of the opening process of the IGBT serial connection while guaranteeing high stability.

The invention relates to an opening and closing method of a submarine carrying aircraft launching canister valve mechanism, and relates to the technical field of launching. By means of the method, according to a command of control equipment on a submarine, normal opening / closing are achieved, seawater enters a launching canister after opening is carried out, and seawater pressure equalizing of a front cover of the launching canister is achieved.

The invention relates to a high-voltage isolation power supply suitable for a high-power voltage occasion. The high-voltage isolation power supply comprises a positive bus Bus+, a negative bus Bus-, atransformer T1, an inductor L1, a first rectifier bridge, a filter, a plurality of switch tubes and a plurality of energy storage capacitors with equal capacitance values, the energy storage capacitors are connected in series and then bridged between the positive bus Bus+ and the negative bus Bus-, and two ends of each energy storage capacitor are connected in parallel with resistors with the same resistance value; the switch tubes are connected in series and then bridged between the positive bus Bus+ and the negative bus Bus-, and the C pole and the E pole of each switch tube are bridged with resistors with the same resistance value; each energy storage capacitor is divided into two groups, the contact between the two groups is A, the switch tube is divided into two groups, the contact between the two groups is B, and the contact B is sequentially connected with the inductor L1 and the primary side of the transformer T1 in series and then connected to the contact A; the transformer T1 is provided with a first group of secondary sides, and the first group of secondary sides are sequentially connected with a first rectifier bridge and a filter and then connected to the output end of the high-voltage isolation power supply.