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137results about How to "Quick balance" patented technology

Wind power-containing multi-domain time-lag interconnected power system sliding-mode load frequency control method

The invention relates to a wind power-containing multi-domain time-lag interconnected power system sliding-mode load frequency control method. The method includes the following steps that: (1) a power system is divided into a plurality of areas including thermal power generation systems and wind power generation systems; (2) with a sliding-mode load frequency controller adopted as a control variable ui (t), uncertain items of system parameters and disturbance caused by load fluctuation are added into a model, so that uncertain item-containing state models can be established; (3) an integral type sliding mode surface sigma i (t) is designed according to concentrated uncertain item-containing state models; (4) the sliding-mode load frequency controller ui (t) is designed; and (5) the ui (t) is adopted as a control instruction to optimize the load frequency deviation of the power system. Compared with the prior art, the control method of the invention has the advantages of simple control, high robustness and wide time-lag margin. According to the control method, communication delay is considered, and obvious optimized control effects can be obtained under different conditions.
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER

Automatic three-dimensional refrigeration house and automatic storage and house temperature balancing and purifying method

The invention discloses an automatic three-dimensional refrigeration house which comprises a house body, an information recognition device, a refrigeration system, a stacking machine system and a computer control device. The computer control device is used for controlling the operation of the stacking machine system and the refrigeration system and achieving automatic storing and taking of goods and fast cooling of the interior of the house. The invention further discloses an automatic storage and house temperature balancing and purifying method of the automatic three-dimensional refrigeration house. The method includes the steps that goods space coded orders in one-to-one correspondence with the operation time of a stacking machine of standard cargo spaces in the house body are set in advance, the information recognition device is used for recognizing the identity information of goods, the goods space coded orders for goods storing and taking are sent out according to a set storage rule, the stacking machine is controlled to operate, and automatic storing and taking of the goods are achieved; dynamic balancing adjusting of the temperature in the house and air purifying in the house are achieved according to the set temperature control program. Labor is saved, more importantly, the goods storage quality is good, and the extremely high commercial value is achieved.
Owner:李勋田

Direct power control method for inhibiting voltage fluctuation of DC-side bus of photovoltaic grid-connected inverter

The invention discloses a direct power control method for inhibiting voltage fluctuation of a DC-side bus of a photovoltaic grid-connected inverter, and belongs to the technical field of converter control. The method comprises the steps of establishing a photovoltaic power generation system, determining instantaneous active components v<alpha> and i<alpha> and instantaneous reactive components v<beta> and i<beta> of a power grid, realizing the maximum power point tracking of a photovoltaic array by adopting a fixed-step perturbation and observation method, determining the disturbance power Pswith a short wavy line thereon by a disturbance observer through a correction link; respectively taking output signals [nu]<^>P and [nu]<^>Q of two PI controllers as the input of a feedforward decoupling controller to construct a feedforward decoupling model, obtaining voltage control signals e<alpha> and e<beta> by combining the output uP and uQ of the feedforward decoupling system based on voltage v<alpha> and v<beta> of the power grid, and carrying out [alpha][beta]/abc conversion on the voltage control signals e<alpha> and e<beta> to obtain an SPWM control signal e<a, b, c> of the inverter. According to the invention, the feedforward disturbance is introduced into the voltage outer loop, and the zero steady-state error tracking of the DC bus voltage can be ensured by adopting a simpleproportional controller; it does not need to obtain phase information of the power grid voltage and does not need to perform synchronous rotation coordinate transformation, so that the stability problem caused by the use of a phase-looked loop (PLL) is avoided.
Owner:NORTHEASTERN UNIV

Load-frequency control method of multi-domain time-lag electric power system with high wind energy permeability

The present invention relates to a load-frequency control method of a multi-domain time-lag electric power system with high wind energy permeability. The method comprises the following steps: S1, establishing a time-lag electric power system with multiple domains, and establishing the mathematics model of each generation system; S2, establishing state models with uncertain items corresponding to each domain according to the mathematics model of a generator; S3, designing an integration type sliding mode surface [Sigma]I (t) according to the state models with uncertain items; S4, designing the sliding mode load frequency controller according to the integration type sliding mode surface [Sigma]I (t); and S5, taking a controller ui(t) obtained in the step S4 as a controlling instruction, and optimizing the load frequency offset of the electric system. Compared with the prior art, a wind driven generator participates the regulation of the system frequency to tightly cooperate the wind power generation with the traditional fire power generation, and the increment of the output power of each generator is evenly reduced to ensure the power supply and demand balance of each area and effectively reduce the frequency offset of each area.
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER

Vibration reaction force active balancing device for vibration-acceleration test device

The present invention discloses a vibration reaction force active balancing device for a vibration-acceleration test device. The vibration-acceleration test device comprises a centrifuge, a vibration table and a balancing weight; the vibration table and a balancing weight are respectively installed at two ends of the pivoted arm of the centrifuge; in the vibration reaction force active balancing device, an excitation electromagnet is fixedly installed at one end of the pivoted arm of the centrifuge and is located at the outer side of the balancing weight; a plurality of control electromagnets is installed at the position having the same height as the excitation electromagnet and is distributed around the rotation virtual circle of the excitation electromagnet; two force sensors are installed on the pivoted arm, signal output ends of the two force sensors are connected with a signal conditioner, a detection controller two power amplifiers in order, and the signal output ends of the two power amplifiers are respectively connected with the excitation electromagnet and the control electromagnets. The vibration reaction force active balancing device for vibration-acceleration test device performs active balance of vibration reacting force generated by a vibration table so as to realize a remarkable force balance effect and achieve the purpose of reducing the vibration of the main shaft of a centrifuge.
Owner:GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS

High temperature and high pressure multiphase fluid comprehensive tester

The invention relates to a high temperature and high pressure multiphase fluid comprehensive tester, which comprises a fluid storage and output system, a high temperature and high pressure simulation system, a fluid solubility analysis and testing system, a sampler, a data collector and a computer host machine, wherein a reaction chamber is arranged in the high temperature and high pressure simulation system, the fluid storage and output system is communicated to a gas inlet, the communicated pipeline is provided with a gas mass and flow rate meter, the gas mass and flow rate meter is sequentially connected to the data collector and the computer host machine, the high temperature and high pressure simulation system is provided with a temperature sensor and a pressure sensor, the temperature sensor and the pressure sensor are respectively connected to the data collector, the sampler is used for sampling a fluid to be detected in the reaction chamber, and the fluid to be detected can be subjected to solubility analysis and testing in the fluid solubility analysis and testing system. According to the present invention, the high temperature and high pressure multiphase fluid comprehensive tester has advantages of simple structure, high test precision, controlled experiment temperature, controlled experiment pressure and controlled experiment volume, can stably work for a long time under the high temperature and high pressure conditions, and is used for the accurate testing of the fluid phase, the fluid property and the solubility.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)

Alcohol-free condensation fountain solution containing colloid silica prepared by magnetic activated water and preparation method thereof

The invention relates to a fountain solution for offset printing, and particularly to an alcohol-free condensation fountain solution containing colloid silica prepared by magnetic activated water and a preparation method thereof. The fountain solution is prepared by the following raw materials, by weight, 6 to 8 parts of glycerin, 0.5 to 0.8 part of dispersant MF, 2 to 3 parts of polyvinylpyrrolidone, 30 to 40 parts of magnetic activated water, a proper amount of acidic buffer, 2 to 3 parts of sodium alginate, 1 to 3 parts of sodium chloride, 2 to 3 parts of colloid silica, 3 to 4 parts of dipotassium hydrogen phosphate, and 1 to 2 parts of fatty alcohol polyoxyethylene ether. The magnetic micromolecule water is used as a solution of the fountain solution, the fountain solution can quickly spread to form a film, the dispersed colloid silica can further speed up adsorption and spread of a hydrophilic film on a printing surface, the wetting effect is improved, and the printing surface can be protected. The fountain solution does not contain volatile alcohols or other harmful substances, is more environmental friendly and safe. The fountain solution can make water and ink balance quickly, no ink accumulates, the printing quality and the printing speed can raised, the condensation fountain solution also is easy to store, hardly go bad, and the condensation fountain solution can be diluted into needed concentration when used.
Owner:HEFEI MEIJIA PRINTING

Rice dumpling packing machine and packing method thereof

ActiveCN105711904ARealize the packaging processUniform deformationPackagingAir pumpEngineering
The invention relates to rice dumpling packing equipment, in particular to a rice dumpling packing machine and a packing method thereof. The rice dumpling packing machine comprises a bottom membrane winding mechanism, a bottom membrane output mechanism, a packing box forming device, a rice dumpling stuffing area and a top membrane seal-capping mechanism in sequence along the feeding direction, wherein the packing box forming device comprises an upper die and a lower die; a lifting mechanism is arranged at the bottom of the lower die; a packing box forming groove is formed in the upper die; a suction cavity is formed in the lower die; one end of the suction cavity is connected with a vacuum air pump; the suction cavity is communicated with the packing box forming groove through a plurality of suction holes; an air containing cavity is formed in the upper die; an air blowing hole corresponding to a ventilation die sleeve in the aspect of position is formed in the lower surface of the upper die; one end of the air containing cavity is connected with the vacuum air pump; and a heater is connected between the air containing cavity and the vacuum air pump. The rice dumpling packing machine and the packing method have the beneficial effect of realizing the whole packing process which comprises packing box forming, stuffing, seal-capping and separated transportation.
Owner:ZHEJIANG WUFANGZHAI INDAL
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