327results about How to "Keep constant" patented technology

Provided is a co-scheduling strategy for multiple energy storage in a distributed light storage micro-gird system. The based multiple energy storage adopts a two-stage converter topology structure comprising a preceding-stage bidirectional DC/DC conversion unit and a back-stage DC/AC conversion unit. A bidirectional DC/DC conversion unit for a storage battery and a bidirectional DC/DC conversion unit for a super capacitor share a DC bus, and are connected with a load and a large power grid through the DC/AC conversion unit and via an LC filter. The co-scheduling method of a two-stage converter for multiple energy storage is characterized by when the distributed light storage micro-gird system is in a grid-connected mode, carrying out double filter control on the two-stage converter for multiple energy storage, controlling the energy-storage element to carry out smooth photovoltaic output power fluctuation, and carrying out adjustment on filtering parameters according to the charge state of the super capacitor and the charge state of a storage battery; and when the distributed light storage micro-gird system is in an off-grid state, controlling the energy-storage element to provide voltage and frequency support to the distributed light storage micro-gird system, the distributed light storage micro-gird system jointly providing power for the load, wherein the energy-storage element is the storage battery and the super capacitor.

The invention discloses a fine simulation test device and a fine simulation test method for slope water erosion. The fine simulation test device comprises an underframe provided with trundles and a test soil groove connected with the underframe, the test soil groove is arranged above the underframe, one end of the test soil groove is hinged to one end of the underframe, and a water tank matched with the test soil groove is arranged at the other end of the test soil groove. A hydraulic rod is arranged between the test soil groove and the underframe, an equalization pond is arranged between thetest soil groove and the water tank, the equalization pond is communicated with the water tank through a water conveying pipe, the water conveying pipe and a water pump are arranged on one side of the water tank, a water discharging pipe is communicated with the lower portion of the water tank, a three-dimensional laser scanner is arranged in front of the test soil groove, a railfall device is arranged right above the test soil groove, and a flow collecting opening connected with the test soil groove is arranged at the end of the test soil groove hinged to the underframe. The fine simulation test device and the fine simulation test method for the slope water erosion have the advantages of being capable of controlling slope soil bulk density, vegetation types and cover degree manually, simulating soil water erosion conditions under different site conditions, and studying influences and response theories of all factors on soil water erosion under different underlying surface conditions.

The present invention relates to a method and a system for controlling a permanent magnet excited, brushless, electronically commutated, three-phase electric motor (2) wherein a single-phase main AC voltage (U_N) having a mains frequency (f_N) is rectified and supplied to an inverter (8) via a slender intermediate circuit (6) containing no, or minimum, intermediate circuit reactance as intermediate circuit voltage (U_z) pulsating at double the mains frequency (2f_N) which is actuated for powering and commutating the electric motor (2). Control takes place by means of a field-oriented current-space vector regulator, wherein a q-current (i_q) as torque-forming component of the current-space vector (i) is regulated perpendicularly to the permanent magnetic field and a d-current (i_d) can be regulated as a field-influencing component of the current-space vector (i) in the direction of the permanent magnet field. In this case, dynamic field attenuation occurs, wherein the d-current (i_d) in the negative range is defined with a sinusoidal profile and at double the main frequency (2f_N) and wherein the d-current (i_d) is regulated according to its phase position and its amplitude such that ripple of the q-current (i_q) is minimized. Since the q-current as torque forming component is proportional to the torque, thus the torque ripple is also minimized, in spite of the strongly pulsating intermediate circuit voltage (U_z).

The invention relates to a liquid crystal panel and a display device containing the same, wherein, the liquid crystal panel comprises a plurality of pixel units; each pixel unit comprises a gating line, a data line, a pixel electrode and a first switch element; the common electrode of a first pixel unit and a second pixel unit is connected to a first common line and a second common line respectively by a second switch element in the pixel units at the same line of the liquid crystal panel, wherein, the first common line is connected to a first common voltage, the second common line is connected to a second common voltage, the first common voltage and the second common voltage are AC voltage, and the voltage levels in the same frame are opposite; meanwhile, the first switch element and the second switch element are equivalently designed thin-film transistors. The liquid crystal panel of the invention can reduce the power consumption of a source driver and improve the quality of images.

The invention discloses a straight cut testing system for rock and earth mechanics, relating to a cutting system. The invention is composed of outer frame, horizontal loading system, vertical loading system, cut box, and measuring system; the horizontal loading system, the vertical loading system, the cut box and the cut box are fixed on the outer frame, respectively; the horizontal loading system, the vertical loading system and the measuring system are connected with the cut box, respectively. The invention has high measuring accuracy and good stability; all the data are automatically collected, thus reducing artificial reading error; it adopts variable frequency electric motor so as to reduce the manufacturing cost on the premise of assuring a stable cutting speed; all the parts are removable, convenient to transport and install. It can be used in determining peak values and remaining shearing strength of fine earth, coarse earth and soft rock and provide strength parameter for engineering design and rock and earth stability.

The invention discloses a device and method for simulating low gravity. The device for simulating low gravity mainly comprises multiple constant-tension control systems and a movable and rotary three-degree-of-freedom comprehensive platform, a control subsystem, a main hanging structure and a multi-hanging-point combined control system, wherein the constant-tension control systems are used for controlling the tension of hanging ropes within the range of the vertical operating stroke according to a command, the multiple constant-tension control systems are connected to the lower portion of the movable and rotary three-degree-of-freedom comprehensive platform and are connected with a simulated low-gravity object through the hanging ropes, the posture parameter of the multiple constant-tension control systems serve as the control information of the movable and rotary three-degree-of-freedom comprehensive platform after being coupled, the main hanging structure is arranged on a servo comprehensive platform, and the multi-hanging-point combined control system calculates the current hanging force values of all hanging points and guarantees that the hanging force meets the set gravity requirement according to the position posture of the simulated low-gravity object, and the hanging force passes through the center of mass of the simulated low-gravity object. According to the low-gravity simulating device, the stress condition of all movable parts of moving mechanisms and the stress condition of the positions where the movable parts are connected can be represented truly so that the device can be adapted to the real-time change of the center of mass.

The invention discloses a device for measuring actual triaxial creep of a geotechnical engineering test specimen. The device comprises a support structure, and also comprises four confining pressure plates, an upper compression plate and a lower compression plate so as to form a closed cavity for wrapping a test specimen, wherein the confining pressure plates comprise two long confining pressure plates and two short confining pressure plats, the upper compression plate and the lower compression plate are a rectangular top steel plate and a rectangular bottom steel plate, the two outwards-bent L-shaped long confining pressure plates are overlapped on two adjacent side surfaces of the bottom steel plate, the two outwards-bent L-shaped short confining pressure plates are overlapped on the other two side surfaces of the bottom steel plate, the bottom ends of the short of the bottom steel plate plates are arranged on the bottom steel plate, the top steel plate is overlapped at the top ends of the long confining pressure plates, the top steel plate is clung to the inner side surfaces of the two short confining pressure plates, pressure sensors corresponding to the four confining pressure plates and the upper compression plate and the lower compression plate are vertically arranged inside the support structure, and grating rulers are arranged on the pressure sensors. The invention also provides a method for measuring the actual triaxial creep of the geotechnical engineering test specimen by using the device.

The invention relates to a material flow system, particularly, relates to the material flow system feeding crude tobaccos according to ratio in crude tobacco production. The material flow system comprises a material flow central control system 4, a crude tobacco boxing area 1, a high-rack warehouse storage area 2 and a box turnover feeding area 3, wherein, the crude tobacco boxing area comprises a boxing area 12 and an empty tank buffer area 13; the high-rack warehouse storage area comprises a warehouse-out platform 21 and a storage rack 22; and the box turnover feeding area comprises a material pouring buffering station 32 and a material feeding station 31. The material flow system converts extensive production of crude tobaccos to fine production, and achieves standardized operation of material flow and automatization management; compared with the traditional operation model, the material flow system can reduce the labor intensity, can improve the tobacco formula accuracy, and can ensure chemical composition constancy of finished tobaccos; and the material flow system can change the production organization, and can change the feeding production organized artificially into the grouping feeding production adopting automatic computer formulating.

The invention discloses a direct-current voltage control unit for a wind power generation system. The direct-current voltage control unit comprises a machine-side controller, a network-side controller and a direct-current voltage controller, wherein the direct-current voltage controller is used for acquiring a direct-current voltage signal and a power grid frequency signal, calculating a corresponding active current instruction signal and a corresponding electromagnetic rotary torque compensation signal according to an acquisition signal, and outputting the active current instruction signal and the electromagnetic rotary torque compensation signal to the network-side controller and the machine-side controller respectively; the machine-side controller is used for acquiring a rotary speed signal of a power generator and a current signal of a stator of the power generator, and correspondingly adjusting a drive signal of a machine-side converter in combination with the electromagnetic rotary torque compensation signal; and the network-side controller is used for acquiring voltage and current signals, and correspondingly adjusting a drive signal of a network-side converter in combination with the active current instruction signal. The invention further discloses a corresponding direct-current voltage control method. Through the adoption of the direct-current voltage control unit and the method, the small interference stability of a direct-current voltage can be enhanced and the system fault ride-through capability can be guaranteed.

A cable recovery machine, comprising at least one traction module configured to hold and draw at least one cable, in particular of a cable laying plant; the traction module comprises a frame on which one or more traction wheels and one or more idle wheels are positioned; between the traction wheels and the idle wheels a space is defined for the passage and traction of the cable to be recovered; the idle wheels are provided with a support connected in a mobile manner to the frame of the traction module and provided with actuators configured to press the idle wheels against the cable that passes between them and the traction wheels, so that the space between the idle wheels and the traction wheels can be automatically adjusted on the basis of the external diameter (D1, D2) or thickness of the cable drawn

The invention discloses a two-electrolyte direct carbon fuel cell and an assembling method thereof, which relate to the technical field of fuel cells. The two-electrolyte direct carbon fuel cell comprises an anode part, a cathode part, and a carbonate layer and a solid oxide layer which are positioned between the anode part and the cathode layer and serve as two electrolytes, wherein the anode part comprises a carbon substrate layer and a porous anode plate; the cathode part is a porous cathode plate; the solid oxide layer is positioned between the porous anode plate and the porous cathode plate; and the carbonate layer is positioned between the solid oxide layer and the porous anode plate. The two-electrolyte direct carbon fuel cell and the assembling method thereof realize a device using the solid oxide layer and the molten carbonate layer at the same time in the same DCFC battery and increase the area of an anode reaction, and simultaneously, the anode carbon substrate layer can be supplied continuously.

It is realized to prevent foreign matter from being produced due to abrasion or cutting of a bearing surface by improving abrasion resistance of the bearing surface. It is also realized to prevent the foreign matter from entering into a tank via the opening of a mouthpiece even when it is produced. The joining structure of tank components comprises a screw joining unit for joining with the mouthpiece of a high-pressure tank, a bearing surface axially contacting the mouthpiece on the tank component side, a bearing surface on the mouthpiece side, contacting the tank component side bearing surface, a recess provided on the inner peripheral side of a portion where the tank component side bearing surface contacts the mouthpiece side bearing surface with each other and on the outer peripheral side of an opening and forming a space between the tank component and the mouthpiece, and a seal member provided in the recess for preventing foreign matter intrusion into the opening in the mouthpiece. It is preferable to treat the surface of at least one of the tank component side bearing surface and the mouthpiece side bearing surface for abrasion resisting.

In order to regulate the metal ion concentration in an electrolyte fluid serving to electrolytically deposit metal and additionally containing substances of an electrochemically reversible redox system, it has been known in the art to conduct at least one portion of the electrolyte fluid through one auxiliary cell provided with one insoluble auxiliary anode and at least one auxiliary cathode, a current being conducted between them by applying a voltage. Accordingly, excess quantities of the oxidized substances of the redox system are reduced at the auxiliary cathode, the formation of ions of the metal to be deposited being reduced as a result thereof. Starting from this prior art, the present invention relates to using pieces of the metal to be deposited as an auxiliary cathode.

The invention provides a quick temperature and pressure change device and a temperature and pressure change method for a high-temperature wind tunnel and belongs to the technical field of high-temperature wind tunnels. Aiming at the problem that under certain pressure and flow conditions, a single adjustment mode can not meet the requirement of the high-temperature wind tunnel with a high Mach number, the following technical scheme is provided and the quick temperature and pressure change device and the temperature and pressure change method for the high-temperature wind tunnel is characterized in that the device comprises a main gas inlet pipe, a first annular gas inlet pipe, a second annular gas inlet pipe, a pressure stabilizing box and a gas outlet pipe, wherein the first annular gas inlet pipe is mounted at the left side of the main gas inlet pipe, the second annular gas inlet pipe is arranged at the other side of the main gas inlet pipe, the connecting part of each of the first annular gas inlet pipe and the second annular gas inlet pipe and the main gas inlet pipe is provided with an opening, the main gas inlet pipe is connected with one end of the pressure stabilizing box,and the other end of the pressure stabilizing box is connected with the gas outlet pipe. The flow ratio of cold gas flow to hot gas flow is automatically converted, and a back pressure valve bank is additionally arranged to filter total pressure fluctuations in an adjustment process so as to ensure the constant upper limits of a total temperature value and a total pressure threshold value in the adjustment process and avoid the linkage between the aperture of a pressure adjusting valve and the flow of cold and hot pipelines, thereby ensuring quick adjustment of the total pressure of a system.

The invention relates to the fields of hot-dip galvanizing alloy technology and auxiliary equipment used therefor, and specifically relates to a dry and wet gas mixing and humidifying device for inhibiting zinc ash in hot galvanizing and a use method thereof. The device comprises a furnace nose (10), and is characterized by also comprising a water tank (1), a water inlet pipe (21), a water discharge pipe (22), an air inlet pipe (23), a flow meter (33), a water level gauge (41), a heater (42), a dew-point instrument (43), a dry gas header pipe (5), a dry wet gas mixing pipe (6), and a control device (7). The use method comprises the following steps in sequence: (i) introducing dry gas; (ii) humidifying the dry gas; (iii) mixing dry gas and wet gas; and (iv) regulating the dew point. The device and method have the advantages that the zinc ash is well inhibited, the strip steel quality is high, the control is accurate, and the automation degree is high.

The invention relates to a dynamic vibration-absorption turning tool based on an extruding working mode of magnetorheological fluid. The dynamic vibration-absorption turning tool comprises a main vibration component and a magnetorheological dynamic vibration-absorption component, wherein the main vibration component is fixedly connected with a normal turning tool, and the magnetorheological dynamic vibration-absorption component is hung on the normal turning tool. The dynamic vibration-absorption turning tool is characterized in that the main vibration component and the magnetorheological dynamic vibration-absorption component are supported and connected by virtue of the magnetorheological fluid and roll balls, wherein the rigidity and damp of the magnetorheological can be changed under a magnetic field, the roll balls are mounted on key slots in two sides of a cutter bar shaft of the main vibration component, and the magnetorheological fluid is filled in a round disc magnetic pole, upper tank body, lower tank body and end cover of the magnetorheological dynamic vibration-absorption component as well as an axial gap between first and second disc-shaped iron cores of the main vibration component. According to the dynamic vibration-absorption turning tool, the magnetorheological fluid is used as a regulating-executing medium, and the parameters such as the damp and inherent frequency of the magnetorheological dynamic vibration-absorption component are changed in real-time and online manners by regulating the magnetic induction intensity aiming at vibration frequencies under different turning working conditions, so that the vibration energy in the turning tool of a main vibration system is maximally absorbed, and the turning vibration is effectively restrained.

The invention discloses an intelligent heating integrated machine which comprises an electric heating system, a hot air system, a detection control system and an evaporator, wherein the detection control system is connected with the electric heating system and the hot air system; the electric heating system comprises a heater, a heat conduction liquid detection device, a pipe temperature detection device and an over-heated protection device; the heater is installed in the evaporator; a hot air device comprises a fan, an air rate controller, a rotation speed detection device and an environment temperature detection device; and the fan is installed on the evaporator. The intelligent heating integrated machine transfers heat through heat conduction liquid; the heat is blown out through the hot air system, and the heat is radiated rapidly, so that the heat is transferred indoors rapidly, the rising speed of the temperature is improved, the heat efficiency is improved, and the energy consumption is lowered; two heaters with different powers are arranged, the condition that the set temperature is constant can be ensured, and the irritation to human bodies by high temperature and low temperature in an alternate way is prevented; and the system is controlled by a central controller, and the intelligent automatic management is realized.