33results about How to "Steady state operation" patented technology

The invention relates to a self-power power supply frequency-hopping control based modular multilevel current converter voltage-sharing method. A charging-discharging principle of series-wound sub module capacitors is analyzed, and a capacitor charging-discharging mathematic model for series-wound power modules is established; controlled parameters affecting the capacitor voltage balance are determined; the capacitor voltage of each module is sampled and obtained for a large number of series-wound power modules, then an average value is obtained from the obtained capacitor voltages; the average value is the voltage-sharing target of each power module; when the capacitor voltage of the corresponding power module is greater than the average voltage value, the high-order energy-taking power supply (refers to the self-power power supply) is controlled to carry out continuous operation; when the capacitor voltage of the corresponding power module is lower than the average voltage value, a modulation signal for controlling the operation of the power supply is calculated firstly; then the frequency and the duty ratio of a triangular wave signal are calculated and determined; and finally the modulation signal is compared with the triangular wave signal to obtain an execution signal for controlling the operation of the power supply. By adoption of the method provided by the invention, the voltage-sharing control of a large number of series-wound power modules can be realized.

The invention relates to a double-motor series prediction type direct torque control method. Electromagnetic torque pulsation of two motors is reduced and the operation stability of a drive system is further improved. A zero sequence current is actively controlled, the distortion of a winding current is reduced, and the stable operation performance of the two motors is improved. In order to reduce system control operation time and improve the digital control rapidity, a prediction type electromagnetic torque and stator flux linkage control method of a partial voltage vector of which zero sequence plane voltage is 0 is employed. Through real-time adjustment of the action time of 0 and 21 or 0 and 42 voltage vectors, the control that the zero sequence current is 0 is realized.

The invention relates to a centrifugal extracting wastewater dephenolization technology. A high-speed centrifuge is used as an extraction device to perform centrifugal extraction separation. The technology comprises the steps as follows: phenol wastewater and an extraction agent enter the centrifuge simultaneously for centrifugal extraction separation, an extract phase phenol solvent and extract phase wastewater are produced after separation, the extract phase phenol solvent enters a solvent recovery tower for rectification separation, and a solvent and crude phenol are recovered; the extraction agent extracted at the top of the tower enters the centrifuge again to be recycled, and the crude phenol is recovered at the bottom of the tower. Compared with the prior art, the technology has the benefits as follows: the technology is low in investment, small in occupied area, simple and reliable in technological process, high in dephenolization efficiency and capable of realizing recovery of the industrial crude phenol.

The invention provides a method for improving the rated stable operation power of uniformity solution nuclear reactor, which is characterized in that a flat reactor core with the ratio of height and the diameter less than 0.5 is adopted to enlarge the surface area of reactor core fuel solution, to reduce the vacuolar coefficient of fuel solution, to control the surface releasing ratio of radiantly decomposed gas: hydrogen and oxygen and to control the reactor core specific power; ruthenium iron ions are added in reactor fuel solution and a device which converts nitrogen generated by the radiation and decomposition of HNO3 into HNO3 and an automatic continuous HNO3 supplementation system are additionally added, so as to enlarge the surface area of a heat exchanger, the gas circuit flux of nuclear reactor and hydrogen and oxygen composition capability of a hydrogen and oxygen compositor in the gas circuit, and to control the hydrogen consistency in the gas circuit. The method of the invention can ensure that the rated stable operation power of the uniformity solution nuclear reactor is higher than 200kW.

The invention relates to a dual-motor series connection open-phase fault-tolerant predictive direct torque control method which is composed of an inverter, a T6 transformation module, a rotating coordinate transformation module, two motor flux linkage calculation modules, a prediction model module and an evaluation function module. According to information such as the current, the rotor position angle, and the rotating speed of the kth topology, predicting the power switch combination of the inverter of the (k+1)th topology from the loss function minimum angle in virtue a stator flux and electromagnetic torque prediction model. The dual-motor series connection open-phase fault-tolerant predictive direct torque control method realizes the mutual operation of decoupling of two open-phase motors, improves a series connection drive system open-phase fault-tolerant capability, realizes precise control of the electromagnetic torque and the stator flux linkage of the two motors, and greatly reduces the steady state pulsations of the electromagnetic torque and the stator flux of the two motors so that the two motors are more stable in steady operation.

The invention is concerned with an energy sources system based on methane pyrolysis and fuel cells, relates to methane catalyzing and pyrolysis device, carbon cells and proton film cells. To keep steady flow operation, carry the methane catalyzing and pyrolysis inside the flowing bed with activator Ni at 500-750DEG C and get70%-80% transform efficiency. Use PEMFC to consume the hydrogen produced from methane pyrolysis, and the electricity efficiency is 0.4-0.65 at 25-100DEG C with well-rounded technology and great application. The carbon fuel cell's electrolyte is molten carbonate and it is used to consume carbon produced from methane pyrolysis, and the efficiency is 0.82 at 550DEG C. This technology owns high integration degree to separate hydrogen and carbon. The carbon cells greatly use all shapes of carbon resource with easy operation.

Provided are a color filter, a coating device for obtaining color filters, and an obtaining method, relating to the color filter technical field. The thickness uniformity of a color filter color layer is less than 1.2%. The coating device for obtaining color filters comprises a coating platform and a coating mechanism, and also comprises an initial segment elevating extension platform and an end segment elevating extension platform. The obtaining method comprises: cleaning and loading a glass matrix; adjusting the initial segment elevating extension platform and the end segment elevating extension platform, and maintaining surfaces flush; starting the coating mechanism; withdrawing the glass matrix which has the surface coated; and cleaning again. The coating device is provided with the initial segment elevating extension platform and the end segment elevating extension platform, allowing the film layers on the glass matrix to be all film layers which are rapidly completed by the coating mechanism in a stable operation stage, and improving glass matrix film thickness uniformity; the coating mechanism and a chip packaging device can both operate in a stable state, the service life of the device can be prolonged, and the cost can be reduced.

The invention discloses an adaptive optimal output feedback controller structure for two interconnected synchronous generator systems and a realizing method thereof. The controller structure is used for controlling a generator system I and a generator system II. The structure firstly aims at a condition of state observing incapability in practical application. A fuzzy observer is designed for estimating the power angles and the power angle speeds of the two interconnected synchronous generator systems and the mechanical frequencies of the generators, thereby reducing the control cost of the two interconnected synchronous generators, and overcoming defects in traditional state feedback control. Afterwards, a traditional adaptive back-stepping method is used for designing an adaptive back-stepping controller, and a performance index function of the two interconnected synchronous generator systems is estimated through neural network technology, and furthermore an optimal controller of thesystem is designed. Through cooperation of the adaptive back-stepping controller and an approximate optimal controller, the control method can ensure stable operation of the two interconnected generator systems and furthermore can reduce the performance index of the system.

The invention discloses a stone crushing device for municipal construction. The stone crushing device for municipal construction comprises a box body, a feeding groove is fixedly formed in the top ofthe box body, a crushing assembly is arranged in the box body, the crushing assembly comprises a fixing block and a cone, a bevel gear on a first transmission shaft is engaged with a gear shaft, a grinding wheel is fixedly connected to the gear shaft, a concave plate is arranged below the grinding wheel, one side of a partition plate is rotationally connected with a rotary shaft, the rotary shaftis provided with a connecting plate, the other side of the partition plate is provided with a screening assembly, and a damping assembly is arranged at the bottom of the box body. The device is reasonable in overall design, compact in structure, good in stone crushing effect and high in processing speed, different types of stone finished products can be obtained according to actual use requirements, and the arranged damping assembly can eliminate vibration caused by the device in the working process, so that the device operates in a stable state.

The present invention relates to a stainless steel single sealing head production method, which is characterized in that a target surface is bombarded for 6-8 min with a plasma flow under a low microwave power (less than or equal to 300 w) and a high target negative bias voltage (less than or equal to 1200 V) to remove the oxides and the absorbed materials on the target surface, and then the target negative bias voltage is removed under a high microwave power (1000 W). According to the present invention, the stainless steel single sealing head production method has advantages of scientific design, stable operation, simple equipment, high efficiency, easy parameter control, and the like.