11results about How to "Reduce the maximum" patented technology

The invention discloses a coordinated control method and device for a deep fault of a wind power sending end and a storage medium, and belongs to the field of safe operation of a power system. The coordination control method comprises the following steps: when a deep fault occurs at a sending end in a wind power flexible direct sending scene, S1, increasing the q-axis current amplitude of a wind power plant, reducing the d-axis current amplitude of the wind power plant, and increasing the amplitude limiting value of the q-axis current of the MMC sending end to a set value so as to meet the low-voltage fault ride-through requirement of the wind power plant; s2, detecting the voltage recovery condition of the grid-connected point of the wind power plant, and judging whether the fault is cleared or not; if yes, executing S3; if not, returning to execute S1; and S3, during the fault recovery period, adopting a suppression strategy to suppress transient overvoltage, and increasing the d-axis current of the wind power plant until the voltage of the sending end of the MMC is recovered to a steady-state value. And in case of a ride-through fault, the transient stability of the wind power plant and the MMC sending end becomes better, and the synchronization stability of the phase-locked loop is improved.

The invention discloses a coordination control method and device for a shallow fault of a wind power sending end and a storage medium, and belongs to the field of safe operation of a power system. Comprising the following steps: when a sending end has a shallow fault in a wind power flexible direct sending scene, S1, increasing the q-axis current amplitude of a wind power plant so as to improve the voltage of a grid-connected point; the d-axis current amplitude of the wind power plant is reduced, and the amplitude limiting value of the d-axis voltage of the MMC sending end is increased to a set value, so that the synchronous stability of a phase-locked loop is improved, and the low-voltage fault ride-through requirement of the wind power plant is met; s2, detecting the voltage of a grid-connected point of the wind power station, and judging whether the fault is cleared or not; if yes, executing S3; if not, returning to execute S1; and S3, during the fault recovery period, adopting a suppression strategy to suppress transient overvoltage, and increasing the d-axis current of the wind power plant until the voltage of the sending end of the MMC is recovered to a steady-state value. And in case of a ride-through fault, the transient stability of the wind power plant and the MMC sending end becomes better, and the synchronization stability of the phase-locked loop is improved.

The invention discloses an optimization method for composite gradient interface insulation of an insulator and a related device, which considers the potential source of surface charges of the insulator in a direct current electric field and the influence of a multi-field coupling environment, and establishes an electric-thermal-current multi-field coupling simulation model for surface charge accumulation of the direct current insulator. Different insulator surface coating schemes are provided by considering electric field distribution modes and surface charge accumulation characteristics of different types of insulator shapes. Finally, an insulator tangential and normal electric field regulation and control strategy combining the geometric structure and surface nonlinear coating partition gradient coating is formed. Therefore, the problems that a quantitative optimization method of the direct-current insulator is lacked at present, and the specific complex curved surface geometric structure of the basin-type insulator cannot be fully considered in the aspect of the surface coating technology are solved.

The invention discloses a pixel driving circuit for field sequential display. The pixel driving circuit comprises a reset pre-storage unit and a driving unit, the reset pre-storage unit comprises a first transistor, a third transistor and a pre-storage capacitor; the grid electrode of the first transistor is coupled to a row grid signal line, the first source and drain electrode of the first transistor is coupled to a data signal line, and the second source and drain electrode of the first transistor is coupled to the driving unit and the first source and drain electrode of the third transistor; a second source drain electrode of the third transistor is coupled to one end of a pre-storage capacitor, and the other end of the pre-storage capacitor is coupled to a common signal line; a gate of the third transistor is coupled to a reset signal line. The driving circuit has the advantages that the requirement for the voltage range of data signal line changes is greatly lowered, and therefore the power consumption of a driving chip and a control row gate signal line output unit is lowered.

The gas cylinder pressure reducer comprises a front cover and a rear cover, an air inlet is formed in one side of the rear cover, an air outlet is formed in the other side of the rear cover, the front cover is arranged at the top of the rear cover, a diaphragm is arranged between the front cover and the rear cover, an adjusting rod is connected to the center of the diaphragm in an inserted mode, and the adjusting rod is connected with the rear cover in an inserted mode. A base is arranged between the adjusting rod at the bottom of the inner side of the rear cover and the air inlet, an adjusting plate is mounted at the top of the base, and a rubber plug is arranged at the bottom of one end of the adjusting plate; according to the gas cylinder pressure reducer convenient to disassemble and assemble, the connecting pipes on the left side and the right side can replace pipelines with different inner diameters to connect gas pipes with different specifications, the application range of the device is widened, the front cover can be opened by disassembling screws in the mounting holes to maintain the interior, and the pressure reducer is more convenient and faster to disassemble and assemble.

The invention provides a V2V user grouping resource allocation scheme and a light guide method, and relates to the technical field of wireless communication, and the V2V user grouping resource allocation scheme comprises the following steps: S1, V2V user grouping, S2, resource allocation power control, and S3, multiplexing matching. The resource allocation problem that a plurality of vehicle users multiplex the same cellular user link resource is solved, the communication reliability of the V2V users is represented through the outage probability, the communication quality of the vehicle users is ensured, meanwhile, the maximum total capacity of the cellular users serves as a primary target, and according to the size of interference between the cellular users and different V2V users, the communication reliability of the V2V users is improved. And multiplexing grouping is carried out on a large number of V2V users, and the optimal transmitting power of all the users in the multiplexing group is solved, so that the communication capacity of the cellular users is effectively improved.

The invention relates to an open-loop control or closed-loop control device for open-loop control or closed-loop control of a light-emitting diode field having n light-emitting diodes, the device having an output end, by means of which an open-loop control or closed-loop control signal for open-loop control or closed-loop control of a controllable switching element can be intercepted, the open-loop control or closed-loop control device can define the switch-on time and / or switch-off time of a pulse by means of the open-loop control signal or the closed-loop control signal, and can control one and / or more controllable switching elements to be closed or open during the determined pulse, k groups are determined or can be determined, each LED is assigned to one of the k groups, so that each of the k groups contains m j light emitting diodes, where 1≤j≤k and I(FI)#imgabs0# and the determined switch-on time and / or switch-off time of the pulses of each group are determined by an open-loop control or closed-loop control device so that the pulses overlap as little as possible.

This invention discloses a fusion reactor divertor tube-plate composite module and cooling target plate structure, relating to the field of magnetic confinement fusion divertor technology. The composite module includes a plasma-facing component and a transition layer. The plasma-facing component is located on the periphery and is used for contact with the plasma. A through-hole matching the transition layer is provided in the plasma-facing component. The transition layer is metallurgically connected within the through-hole, and a cooling pipe is metallurgically connected within the transition layer. Coolant flows through the cooling pipe to remove heat generated by fusion. The outer side of the transition layer has a U-shaped structure with a flat top and a round bottom, while the inner side has a circular structure. This design effectively increases the weight ratio of the transition layer to the plasma-facing component, improving the overall thermal conductivity of the composite module, alleviating stress and strain concentration problems, and ensuring the safety of the divertor target plate module, preventing the target plate material from detaching and contaminating the reactor core plasma under high heat loads.

The utility model discloses an improved floating plate upper -placed formula slab shear hinge, this shear hinge includes the embedded sleeve pipe in the floating plate, installs the stud in this embedded sleeve pipe, the upper surface of low side's floating plate places the height -adjusting base plate, and the height -adjusting base plate or the floating plate is provided with the buffer pad and the shear plate, and the shear plate, buffer pad, height -adjusting base plate realize the fixed through the double -layer single -cut groove self -locking nut and flat washer of stud top. Wherein, be provided with stiffened plate on shear plate, and through the optimization shear hinge stud's layout position solved the uneven problem of existing shear hinge stud stress. Through the optimization shear plate shape, reduced the thickness of shear plate, saved the use of material, embedded steel sleeve pipe bottom 2 layer bottom plate for increasing the pullout resistance of embedded steel sleeve pipe. The stud only sets up the screw thread in the lower part, is used for the axial force that the stud received is transmitted to the inside of floating plate, reduces the stress level of floating plate surface concrete to reduce or avoid the damage of the board body.

The invention discloses an easy3b module with improved heat dissipation performance, and relates to the technical field of power module heat dissipation, the easy3b module comprises a power module, a plurality of chips are integrated on the power module, the easy3b module further comprises a heat conduction structure fixed on the power module, a cavity is formed in the heat conduction structure, and a capillary structure and phase change liquid are arranged in the cavity, the heat conduction structure is used for absorbing heat of the power module and the chip; the soaking structure is fixed to the side, away from the chip, of the heat conduction structure, the side, facing the heat conduction structure, of the soaking structure is provided with an opening, the opening is provided with a phase change material, the phase change material is arranged between the soaking structure and the heat conduction structure in a surrounding mode, and the phase change material is attached to the corresponding faces of the soaking structure and the heat conduction structure at the same time; the projection of the phase change material on the corresponding surface of the power module at least covers the positions of the plurality of chips. In this way, the maximum value of the local highest temperature caused by heating of the chip position on the power module can be reduced, and it is avoided that a safety threshold value is reached.

The invention relates to the technical field of intelligent household appliances, and discloses a control method for an air conditioner indoor unit, the air conditioner indoor unit comprises a first motor, a second motor, an air guide plate and a connecting rod, the air guide plate is rotatably connected with the connecting rod, a first output shaft of the first motor is connected with the connecting rod, and a second output shaft of the second motor is connected with the air guide plate; the control method comprises the steps that in response to an air deflector starting request, the current position relation among the gravity center of an air deflector, the axis of a first output shaft and the axis of a second output shaft is obtained; determining operation parameters of the first motor and the second motor according to the starting request and the current position relation; and controlling the first motor and the second motor to operate according to the operation parameters. In the rotating process of the air deflector, the maximum value of the output torque needed by the motor is reduced, the shaking degree of the air deflector is reduced, and the load of the motor is reduced. The invention further discloses the air conditioner indoor unit and a storage medium.