38results about How to "Reduce frequent movements" patented technology

The invention provides a method for drying through a temperature sensor of a roller washing machine. The method is that three temperature sensors are arranged to operate. The method comprises the steps of 1, presetting T1max, T2min and T2max; 2, drying, namely, synchronously starting a condenser, a water feeding valve, a draining pump, a condenser, a blower pump and a heater, or starting to circulate hot water, and determining that the clothes are dried after any one of the two necessary conditions is met during drying; 3, dynamically detecting t1, and finishing drying when the t1 is less than 50 DEG C. According to the method, the three temperature sensors are matched to monitor and determine the state, and the determining method is the same and free of influence of the clothes load in the washing machine and the water content rate of the clothes, so that the drying effect can be accurately determined; a certain fuzzy artificial intelligence function is achieved.

The present invention relates to a multi-source micro-grid frequency coordination method based on adaptive robust control. The method includes the steps of: 1) constructing a multi-source micro-grid including multiple groups of photovoltaic systems, diesel engine systems, energy storage systems and various types of loads. Power grid system; 2) Set the frequency modulation power of the photovoltaic system, obtain the adjustable frequency deviation range of the photovoltaic system, and set the frequency deviation threshold according to the adjustable frequency deviation range; 3) Propose a frequency coordination strategy to make the photovoltaic system and energy storage system according to the frequency Coordinated operation of the deviation threshold, participating in the primary frequency adjustment of the multi-source microgrid system; 4) Construct a sliding mode load frequency controller based on the diesel engine system; 5) Use the output command of the sliding mode load frequency controller as the compensation amount for the secondary frequency adjustment of the diesel engine system , combined with the proposed frequency coordination strategy to complete the frequency coordination. Compared with the prior art, the present invention has the advantages of actively participating in frequency regulation, strong robustness, reducing frequent actions and power configurations of the energy storage system, and the like.

The invention discloses a control system and a control method of a primary fan with a liquid resistance speed regulator, belongs to the technical field of automatic control of the primary fan with the liquid resistance speed regulator and aims to solve the technical problems that the primary fan system of the boiler in the prior art has not been put into automatic control, operates in the manual state all the time and has influences on the stable and economical operation of the boiler. The control system comprises a primary fan inlet baffle control device and a liquid resistance speed regulator control device, wherein the primary fan inlet baffle control device comprises a first function generator and a first adding device; the input end of the first function generator is connected to an input interface A; the output end of the first function generator is connected to a first input end of the first adding device; the liquid resistance speed regulator control device comprises a second function generator and a third adding device; the input end of the second function generator is connected to an input interface B; the output end of the second function generator is connected to a first input end of the third adding device. Through the control system and the control method of the primary fan with the liquid resistance speed regulator, the advantage that the boiler can operate stably and economically can be exerted.

The invention provides an expansion valve, which belongs to the technical field of air conditioning. It solves the problem that the valve core of the existing expansion valve frequently impacts under the force of the spring and reduces the service life of the valve. The expansion valve includes a shell with an inlet end and an outlet end, and a straight cylindrical valve body with an inner cavity is fixed inside the outer shell, and an inlet and an outlet connecting the inner cavity and the outer shell are opened on the side wall of the valve body, between the outer shell and the valve body There is a spacer that separates the inlet from the outlet, and the inner cavity is provided with a valve core 1 and a valve core 2 that can slide along the inner cavity and are paired with each other. Retaining ring, the two ends of the inner cavity are respectively equipped with spring components that make the spool 1 and spool 2 have a tendency to move towards the retaining ring, and there is a buffer between the spool 1 and spool 2 that can buffer The active damping structure. Due to the existence of the damping structure, there is a buffering process when the valve core 1 is close to the valve core 2, which reduces the impact between the valve cores and improves the life of the expansion valve.

The invention discloses an equipotential connection device for selectively separating and closing subway screen doors and a control method thereof. The equipotential connection line connects rails and subway screen doors and is provided with a connection mechanism, which is in a normally open state; Obtain the potential difference between the rail and the subway shield door; the connection mechanism monitoring control module obtains the voltage data measured by the voltage measuring device, the switch signal of the subway shield door and the opening and closing state signal of the equipotential connection line connection mechanism, and makes a logical judgment; When the connection mechanism of the equipotential connection line is in the disconnected state, if the shield door is opened and the potential difference between the shield door and the rail exceeds the set value, the connection mechanism will be closed, otherwise the status quo will be maintained; when the connection mechanism of the equipotential connection line is in the closed state , if the screen door is closed, the connection mechanism is disconnected, otherwise the status quo is maintained. This scheme can not only ensure the safety of passengers getting on and off the bus, but also solve problems such as ignition of screen doors, and has high reliability.

The present disclosure provides a laser radar-based independent pitch control optimization method and system for wind turbines, which performs numerical fitting on the wind speed and height data in front of the wind turbine measured by the laser radar to obtain the real wind shear index and wind shear formula; Determine the height of the center point of each blade by the azimuth angle of the wind rotor, and then determine the wind speed value of each center point of the three blades by the wind shear formula; calculate the fatigue load value of the blade root under different wind shear exponents, and determine the critical wind shear Variable index; when the real wind shear index meets the opening conditions set by the independent pitch control, the independent pitch control is turned on, and the pitch angle adjustment coefficient of each blade is determined according to the wind speed value of each center point of the three blades, and the independent pitch angle adjustment coefficient is obtained. Three blade pitch angle settings in pitch control mode; otherwise, unified pitch control. The disclosure can not only significantly reduce the fatigue load caused by the unbalanced thrust of the impeller, but also alleviate the problem of reduced service life of components such as the pitch drive and the pitch bearing caused by too frequent pitch changes.

The invention provides a negative pressure optimal control method of a BFG boiler. The negative pressure optimal control method comprises the following steps that a hearth negative pressure setting value is subtracted from a hearth negative pressure measuring value to obtain a hearth negative pressure deviation signal; the hearth negative pressure deviation signal is inputted into a PI controller,the PI controller calculates a PI operation output quantity; an air supply quantity corrected by oxygen amount is multiplied by feedforward gain to obtain an air supply quantity feedforward calculation output quantity; pressure of the blast furnace gas main pipe is multiplied by the feedforward gain to obtain a coal gas quantity feed-forward operation output quantity; the PI operation output quantity is added with the air supply quantity feedforward calculation output quantity and the coal gas quantity feed-forward operation output quantity, and a variable-frequency input quantity of an induced draft fan is obtained; and the output of the induced draft fan is adjusted through the variable-frequency input quantity of the induced draft fan, and then the negative pressure of the hearth is adjusted. According to the negative pressure optimal control method of the BFG boiler, not only can induced wind frequency conversion control be used for carrying out continuous deviation adjustment onthe negative pressure of the hearth in response to an air volume change, also the change of the blast furnace gas quantity can be quickly responded, so that the pressure of the hearth is guaranteed tobe micro-negative pressure, the combustion of the boiler is stabilized, the internal disturbance of the system is inhibited, and the running stability of a generator set is improved.

The invention discloses a device for improving the vacuum of a thermal power unit, comprising a steam turbine low-pressure cylinder, the steam turbine low-pressure cylinder is provided with an exhaust pipe, the exhaust pipe is respectively connected with a steam condensing device and an air-cooled condenser, and the exhaust pipe is connected with the air-cooled condenser There is a mixing device in the steam distribution pipe of the air-cooled condenser. The lower end of the air-cooled condenser is connected to a condensate tank and an air extraction device. The condensate tank is connected to a circulating condensate header through a condensate regulating valve. The air extraction device is connected to the reverse Rankine cycle electric pump refrigeration system through the cooling water regulating valve 2 and the circulating cooling water pump in turn. The circulating electric pump refrigeration device is connected, the circulating condensate collection tank is connected with the steam condensing device through the circulating water pump, the circulating cooling water pump and the cooling water regulating valve are connected with the steam condensing device, and the condensed water tank is connected with the steam condensing device through the circulating water pump.