110results about How to "Improve reliable operation" patented technology

The invention relates to an emergency protection circuit device capable of completing automatic switching when an AC-DC power grid is in an abnormal state, and in particular relates to an intelligent warning and control method dedicated for ensuring safety and stability of the power grid. The method comprises the steps that: an intelligent control master station acquires real-time data of the power grid through an EMS (energy management system), and an intelligent control substation in each zone real-timely monitors the bus voltage of the zone, power-receiving channel overload, main transformer overload in the zone and voltage instability of the power grid in the zone, and starts the power grid safety and stability control operation; the acquired real-time data of the power grid is integrated with the information uploaded by each substation to real-timely form tide section data of the power grid, and the safety and stability of the power grid are evaluated online; and safety and stability early-warning information of the power grid is provided by using the real-time operation data of the power grid to realize safe and stable control of the power grid and to realize the function of the second line of defense of the power system. The method provided by the invention can ensure safe and stable operation of the power grid by regulating a stability control device according to the running condition of the power grid.

The inverter device contains the following structure: an inverter circuit which has upper-arm switching elements that are connected on a positive side of a DC power source and lower-arm switching elements that are connected on a negative side of the DC power source; a current sensor that detects current flowing between the DC power source and the inverter circuit; and a control circuit that controls the inverter circuit by a PWM driving so that the inverter circuit outputs AC current to the motor. The control circuit provides a carrier cycle with a first correction and provides the successive cycle with a second correction, by which the current sensor can detect phase current of the motor. A ripple current caused by the first correction and a ripple current caused by the second correction are opposite in polarity.

The invention discloses an air and water hybrid cooling high-speed permanent-magnet motor and belongs to the technical field of motors. The large-power high-speed permanent-magnet motor comprises a casing, a cooling water jacket, a stator core, a stator radial air duct, a stator inner air duct, a motor rotor, an outer rotor axial fan, an outer rotor fan fixing frame and two sliding bearings. The stator core is divided into two sections, the radial air duct is reserved in the middle, and the inner air duct is reserved in a stator slot close to the air gap position. The cooling water jacket is arranged outside the stator casing, a spiral water way is arranged in the water jacket, and water flows into the water way from the middle of the water way and flows out from a left spiral water outlet and a right spiral water outlet which are arranged at two ends of the water way. The air and water hybrid cooling high-speed permanent-magnet motor can mechanically solve the problem that a permanent magnet is broken when bearing large pulling stress during high-speed rotating, further solves the problems that the large-power high-speed motor is large in loss density, difficult in heat dissipation and over high in temperature rising, and prevents the permanent magnet from having irreversible demagnetization easily at high temperature.

The invention discloses an on-line transmission line lightning shielding failure trip early-warning method. The method comprises the following steps of: performing statistics on historical lightning shielding failure trip information to obtain transmission line lightning shielding failure trip probability distribution by a two-dimensional information diffusion theory and a conditional probability method; selecting radar forecast data, such as echo intensity, echo tops and vertical accumulated liquid water content; establishing a lightning current magnitude prediction model based on a back propagation neural network; and sending real-time early warning and an early warning grade of transmission line lightning shielding failure trip probability according to the predicted lightning current magnitude and the side distance to lightning stroke and by virtue of the transmission line lightning shielding failure trip probability distribution model. According to the real-time forecast data of a meteorological radar, the method provided by the invention can predict the trip probability of a transmission line and send an early warning signal, thereby providing reference for decision-making analysis of grid dispatching operators, making a transmission line dispatching strategy in time, improving power supply reliability, lowering economic loss of a grid, and improving the reliable running ability of the grid.

An integrated thermal apparatus for improved electronic device performance has an energy storage device coupled with a thermoelectric management device for managing thermal energy generated by the electronic device. The thermoelectric management device can include a semiconductor thermoelectric device and phase change material, which can be integrated into a foam aluminum structure. The energy storage device can be a nanometallic device. The electrical load electrical efficiency is improved by co-locating it with thermoelectric management device directly on a composite substrate foundation to provide enhanced waste heat conversion to electrical energy. The apparatus manages the thermal and power issues at the substrate level in close proximity to the electrical load and incorporates the needed thermal mass into the support structure by way of a phase change material.

The invention discloses a pump/motor-based parallel-series hybrid hydraulic excavator driving system, which comprises a movable arm driving cylinder, a mounting mechanism, an electric quantity storage unit, a hydraulic control element, a group of other actuating mechanism consisting of a bucket cylinder, a bucket arm cylinder and a travel hydraulic motor, an engine, a first motor and a variable displacement pump which are in coaxial mechanical transmission connection with the other actuating mechanism, and a second motor, a pump/motor, an electromagnetic clutch and a speed reducer which are in coaxial mechanical transmission connection with the mounting mechanism. The displacement pump is connected to the other actuating mechanism through a hydraulic main control valve; the first motor iselectrically connected with the electric quantity storage unit; the second motor is electrically connected with the electric quantity storage unit; the hydraulic control element is communicated with oil circuits of the movable arm driving cylinder, a parallel hybrid system, a series hybrid system and the other actuating mechanism. The efficiency of an energy recovery system is improved, the flowing flexibility of recoverable energy and the diversity of control modes are increased, and the cost is reduced.

The invention discloses a high-reliability mixed excitation fault-tolerant motor system. The high-reliability mixed excitation fault-tolerant motor system comprises a stator, a rotor, a rotating shaft, permanent magnets, armature teeth, fault-tolerant teeth, armature coils and magnet exciting coils. The rotating shaft comprises a shaft body, clamping columns and protrusions, the clamping columns are evenly distributed on the outer circumferential face of the shaft body, and the protrusions are arranged on the clamping columns. The clamping columns are fixedly inlaid into rotor poles of a rotor pack, and the permanent magnet are wedged between the rotor poles. A permanent-magnet magnetic field is formed by all the permanent magnets, and an electro-magnetic magnetic field is formed by all the magnet exciting coils. Compared with a traditional built-in permanent-magnet synchronous motor, the high-reliability mixed excitation fault-tolerant motor system has the advantages that a magnetism separating bridge is saved, magnetism leakage of the permanent magnets is avoided, mechanical strength of the motor during high-speed operation is improved, and high-reliability operation of the motor is guaranteed; meanwhile, the advantages of being wide in speed governing scope, high in torque/power density, high in efficiency and the like.

This invention provides a network remote monitor system to air conditioners including an up computer and an air conditioner as the down computer in which the control circuit of the said air conditioner comprises a microprocessor CPU, the said up computer is one connecting with a modem via a communication interface. The control circuit of the said air conditioner also comprises a data processing unit with move than two communication interfaces connecting with CPU of the air conditioner by the interface and connecting with the modem by another interface. The said modem is connected with public phone network providing data and information transfer between the up and down computers.

The application relates to a battery thermal management control method and device, computer equipment and a storage medium. The method comprises the following steps of acquiring a vehicle battery temperature, and acquiring a plurality of pre-stored wind speed control schemes; determining, in the plurality of wind speed control schemes, a target control scheme that is matched with the vehicle battery temperature; and controlling the fan speed by the target control scheme, wherein the fan speed is used to control the rotation of the fan to adjust the vehicle battery temperature. The method can not only effectively improve the intelligence degree of controlling the battery thermal management system, but also accurately control the temperature according to the actual condition of the battery and reduce the excess energy consumption. At the same time, the fan speed is controlled by the vehicle battery temperature, and then the fan speed is used to affect the vehicle battery temperature, thereby enhancing the reliability operation of the battery thermal management system.

The invention discloses a high-efficiency cotton straw forage crusher and belongs to the technical field of straw processing. The crusher comprises a crushing box, wherein a crushing shaft is mountedin the crushing box, the bottom of the crushing shaft is connected with a gear box, the horizontal position of the gear box is connected with a cutting shaft, and the left end of the cutting shaft penetrates through the crushing box to be connected with a cam; the upper end of the cam is in contact with a rolling ball, the upper end of the rolling ball is connected with a baffle, the upper end ofthe baffle is connected with a lifting shaft, the lifting shaft penetrates through a guide frame arranged at the left end of the crushing box to be connected with a cutting knife, and the cutting knife is arranged in a guide cylinder; the guide cylinder is fixed to the lower end of a feeding cylinder arranged at the upper end of the left side of the crushing box, and a reset spring is arrange on the outer side of the lifting shaft between the baffle and the guide frame. According to the high-efficiency cotton straw forage crusher, straw in the feeding cylinder is crushed and cut into a plurality of pieces, the straw pieces enter the crushing box, blockage of a feeding port is avoided, and the reliable running capability of the high-efficiency cotton straw forage crusher is improved; meanwhile, the straw is crushed in the vertical and horizontal directions through the crushing shaft and the cutting shaft.

The invention discloses a three-dimensional model construction method suitable for a VR/AR transformer substation operation environment. The method comprises the following steps: S1, quickly collecting a three-dimensional model of a large scene and various drawing data of lines, surfaces and bodies by recording three-dimensional coordinates, reflectivity and texture information of a large number of dense points on the surface of a measured object by utilizing a laser ranging principle; S2, acquiring original image data by using the single lens reflex after effect detection, and rapidly restoring real scenes and models of equipment, towers and lines by using laser point cloud processing software and photogrammetry software; S3, simplifying triangulation network data, reducing the number ofmodel surfaces, achieving the purpose of optimizing the model, adjusting the positions of nodes on the basis of a local-global thought without changing the interconnection mode of the nodes, and improving the uniformity of the image grids on the whole. According to the invention, the problems of long 3D modeling time consumption and poor fineness in the prior art of substation equipment are solved, and a substation operation system is enabled to maintain safe and efficient operation.

The invention relates to a system for realizing main-backup switch and load share, and relative method, wherein said system comprises: an interface distribute module, a service processing module, a media flow processing module and a control module; at least one module, via main module and backup module forms main-backup relationship, and said four modules have signal communication, to reazlie main-backup switch and load share; said interface distribute module is used to distribute the user signal data and media flow data, to inform the service processing module and the media flow processing module to process the user signal and the data flow, to share load of system; said service processing module is used to process and manage the signal of user; the media flow processing module is used to process and transmit the data flow of user; and the control module is used to detect the main-backup switch and trigger the module to switch main and backup.

The invention discloses a short-term N-2 risk evaluation method for an electric transmission line in thunder and lightning weather. The method comprises the following steps: 1) carrying out statistics on time of various thunder and lightning levels issued by the meteorological department in a statistical period in a region; and at the same time, obtaining thunder and lightning information in corresponding thunder and lightning pre-warming levels through a thunder and lightning positioning system; 2) correcting the historical thunder and lightning pre-warming levels by actual thunder and lightning thunderbolt density to obtain accurate thunder and lightning process numbers of the thunder and lightning levels; 3) calculating the line thunderstrike trip failure rate of the region in the thunder and lightning level D in the statistical period; and 4) carrying out short-term N-2 risk evaluation to an electric transmission line set with failure risk. The method disclosed by the invention can provide ground for decision analysis of operators for power grid dispatching to immediately take risk pre-control measures of transferring the line load in advance so as to ensure that the level of loss of load of the system is minimum or maintained in an acceptable state under the predicted meteorological effect, so that the power distribution reliability is improved, the economic loss of the power grid is reduced and the reliable operation capacity of the power grid is improved.