30results about How to "Control objectives are clear" patented technology

The invention discloses an automatic control method of thermal-power-unit SCR denitration ammonia spraying. The automatic control method includes the steps that the smoke flow and SCR-inlet-nitric-oxide concentration are obtained; the smoke flow is multiplied by the SCR-inlet-nitric-oxide concentration, and the basic-nitric-oxide content in smoke is obtained; the basic-nitric-oxide content is multiplied by the set denitration efficiency, and the basic-liquid-ammonia demanded quantity is obtained; the denitration-outlet-nitric-oxide content is obtained, the denitration-outlet-nitric-oxide content is compared with a denitration-outlet-nitric-oxide set value, an initial correction factor is obtained, a final correction factor is obtained in cooperation with further correction, and the liquid-ammonia demanded quantity is corrected. As the denitration-outlet-nitric-oxide set value is introduced, the denitration-outlet-nitric-oxide concentration serves as a final control target, the control target is specific, physical inspection and operation intervention intensity of operational persons are reduced, and the operational persons are liberated out of busy working. The invention also discloses an automatic control system of thermal-power-unit SCR denitration ammonia spraying.

The invention provides a water management closed-loop control method for a fuel cell. The water management closed-loop control method is characterized in that a theoretical calculating value of the anodic gas pressure drop of the fuel cell is solved, an anodic gas pressure drop control interval for ensuring a good water management state is set, when the numerical value of the anodic gas pressure drop exceeds the control interval, the numerical value is in the control interval again by adjusting the temperature of the fuel cell so as to complete water management closed-loop control, and after the fuel cell is reset to an initial temperature, the fuel cell is still in a good water management state. The water management closed-loop control method has the advantages that the control interval is calculated according to the anodic gas pressure drop theory of water management, so that the control objective is clear; by adjusting the reaction temperature of the fuel cell, the control interval is moved, the numerical value of the anodic gas pressure drop is in the control interval, and the control manner is simple and easy to operate and realize; and an appropriate temperature adjusting numerical value can be solved, the state of the anodic gas pressure drop can be observed in real time, the control objective is clear, the water management control period is short, and the engineering application is facilitated.

The invention belongs to the technical field of transient stability prevention and control aided decision making of a power grid and discloses a transient stability prevention and control aided decision making method based on a security domain. The method comprises the steps that practical dynamic security domain information, power grid operation mode information and control cost information are obtained firstly, then transient stability assessment based on the practical dynamic security domain is performed, control strategy calculation based on transient stability improvement is performed, strategy calculation of node injection power reduction control and node injection power improvement control is performed through alternative iteration, and finally additional control strategy calculation of power grid power balance is performed. Rapid analytical calculation of transient stability control aided decision making is achieved by fully utilizing results of offline and online security and stability assessment, limit calculation and control aided decision making analytical calculation, the accuracy and efficiency of transient stability prevention and control aided decision making are constantly improved, and the method has the important significance on improvement of power grid security and stability operation level and improvement of security and stability control benefits.

A power coordinating controller applied to the photovoltaic storage system, the single-chip microcomputer controls the photovoltaic power generation system and the battery pack, the photovoltaic power generation system and the battery pack are connected to the load, and has voltage acquisition circuits I and II, current acquisition circuits I and II, and DC‑DC Circuit, drive circuit, temperature acquisition circuit; voltage acquisition circuit Ⅰ and voltage acquisition circuit Ⅱ are connected to pins PA1 and PA2 of the microcontroller; current acquisition circuit Ⅰ and current acquisition circuit Ⅱ are connected to pins PA4 and PA5 of the microcontroller; DC‑DC The circuit is connected to the single-chip microcomputer through the driving circuit, and the driving circuit is connected to the pin PA8 of the single-chip microcomputer; the temperature acquisition circuit is connected to the pin PA6 of the single-chip microcomputer; the photovoltaic power generation system is connected to the battery pack through the DC-DC circuit; the first load forms the second load through the step-down circuit. Load available voltage. The invention realizes the cooperation between the photovoltaic power supply and the charging and discharging mode of the storage battery under the maximum power state, and realizes long-term and stable operation of the joint power supply of the photovoltaic power generation system and the storage battery group with a large load.

The invention discloses a feedforward control method for edge drop of a head part and a tail part of strip steel. The feedforward control method comprises the following steps: dividing the head part and the tail part of the strip steel into a plurality of segments along the direction of travel of the strip steel; for each of the segments, performing the following steps: getting n points from the edge part to the center of the strip steel and in the width direction of the strip steel; collecting edge drop values, at the n points, of the incoming strip steel; determining a play value, which corresponds to each point, of a working roll through the following model formula: DeltaWRSi=-ki{[(EC-Ei)-alpha]*beta+m}; calculating the sum DeltaWRS of play values which correspond to the n points; executing the DeltaWRS so as to perform edge drop control. According to the feedforward control method for the edge drop of the head part and the tail part of the strip steel, accurate control can be performed on the edge drop of the head part and the tail part of the strip steel.

The invention discloses an automotive adaptive cruise control method taking multiple targets into consideration. A layer control strategy is utilized, upper layer control can decide an expected longitudinal acceleration according to a target vehicle and a current state of a controlled vehicle, and lower layer control can track the expected longitudinal acceleration through a reverse recursion method. The automotive adaptive cruise control method comprises the following steps: a mutual longitudinal dynamitic model between two vehicles is established, a design model predicating controller can obtain the expected distance between two vehicles according to a constant time headway strategy, a model prediction control algorithm is utilized to decide an expected longitudinal acceleration for tracking the expected distance between the two vehicles, vehicle control work conditions are divided into a driving work condition and a braking work condition, reverse longitudinal dynamic models for the two work conditions are established respectively according to a vehicle driving equation, an expected throttle percentage is obtained according to the vehicle reverse longitudinal dynamic model and the expected acceleration in the driving work condition, and an expected brake pedal openness is obtained according to the expected acceleration in the braking work condition.

A hierarchical control and operation method for No. 0 high-increase operation of a power station unit under multiple working conditions, comprising the following steps: (1) specifying the control target of No. 0 high-increase; (2) multi-working conditions for the operation of No. 0 high-increase Carry out modular division; (3) divide the control process into three-level control, this method can adapt to the automatic operation of No. To achieve the purpose of graded response and precise control, the adjusted quantity can be operated in the optimal range, and at the same time, it can provide early warning, accurate alarm and quick response in the face of abnormal conditions, which significantly improves the overall economy and safety of the unit.

The invention provides a harmonic current compensating method based on fast Fourier transform. For an occasion that double-sequence current decoupling control is adopted for chain static synchronous compensator (STATCOM) inner loop circuit control, and harmonic current compensating precision is ensured by correcting a harmonic current instruction under the condition that inner loop control bandwidth is relatively low. The compensating method comprises the following steps of: firstly, respectively performing fast Fourier transform (FFT) analysis on load current and current converter output current; secondly, calculating the errors of a load current amplitude value, a current converter output current amplitude value, a load current phase and a current converter output current phase, and respectively correcting a harmonic current amplitude value and a phase instruction according to the errors; and finally, reconstructing the corrected amplitude values / phases to obtain the harmonic current instruction of a chain current converter. The influence of the bandwidth and delay of a controller on the harmonic current compensating precision is considered to keep the errors of the output current and the load harmonic current within hysteresis width, the harmonic current compensating precision is improved, and the practical engineering value is relatively high.

The invention discloses an adaptive cruise control method for an electric vehicle, which comprises the following steps: estimating the sliding acceleration by adopting a recursive least squares algorithm with multiple forgetting factors; establishing a motion state prediction model of the vehicle in front and the vehicle; The sliding acceleration and the two-vehicle motion state prediction model established in step 2 are used to design the upper controller for adaptive cruise; the lower controller for adaptive cruise is designed according to the inverse longitudinal dynamics model of the vehicle. The present invention estimates the sliding acceleration online through the multi-forgetting factor recursive least squares algorithm, and introduces the estimated sliding acceleration into the upper-layer controller established based on the model predictive control theory, while satisfying the vehicle followability, safety and economy, Taking the minimum acceleration fluctuation and driving-braking switching frequency as the comfort target can significantly reduce the driving-braking switching frequency in the process of adaptive cruise control and improve the vehicle comfort.

The invention discloses a 12 / 6-pole hybrid rotor structure magnetic suspension switched reluctance generator and a control method thereof. A stator of the generator has 12 tooth poles, each stator tooth pole is wound by a winding, a rotor is formed by axial superposition of 6 tooth poles and a disc and has no windings. The pole width of salient poles of the generator stator is the same as that of salient poles of the rotor. The structure enables inductance of each phase to have a 1 / 2 cycle to be located in a flat area of the bottom, 1 / 4 to be located in a rising area, and 1 / 4 to be located in a falling area. In power generation operation, only three phases in a mechanical structure which form 120 degrees with one another and whose inductance is located in the flat area and the rising area are conducted, each phase independently controls generation of suspension force and provides excitation for a power generation stage, and the rest three phases located in the inductance falling area generates electricity with follow current. The novel generator integrates a radial magnetic bearing and a switched reluctance motor, rotor pole braking torque is large, generated output is large, influence of suspension phase current on power generation phase current is small, and the radial load capacity is high.

The invention relates to a wireless charging power supply side circuit reducing the number of switching tubes. The wireless charging power supply side circuit reducing the number of the switching tubes is characterized by comprising a rectification inverter circuit and a plurality of primary side coils which are controlled by the rectification inverter circuit. The rectification inverter circuit comprises an AC / DC rectifier. The output end of the AC / DC rectifier is connected with n bridge arms in parallel, wherein n is larger than or equal to 3. Each bridge arm comprises two switching tubes, and the leading-out end between the two switching tubes of each bridge arm is connected with one end of the corresponding primary side coil. The leading-out end Wi and the leading-out end Wj of every two bridge arms are connected with one primary side coil Wi-Wj, wherein i is not equal to j, and the primary side coil Wi-Wj is charged. The leading-out ends of the n bridge arms are combined for charging the primary side coils, wherein the number of the primary side coils can be seen in the specifications.

The invention relates to a thickness deviation-on-plate control method of a cold-rolled sheet. The invention adopts a cold rolling absolute thickness difference thickness deviation-on-plate control mode, a difference value of center thickness of strip steel and a set thickness value is calculated correspondingly so as to ensure the control mode of the thickness deviation-on-plate of the strip steel whole plate, the small fluctuation of the thickness of an edge part in the length direction of the strip steel is guaranteed, and a control strategy of bending roll first and displacement later is adopted; and a control scheme of the thickness deviation-on-plate thickness absolute value refers to the fact that when the thickness deviation-on-plate is controlled, an absolute value thickness control mode is adopted, a control mode is implemented according to a each thickness value of a transverse position. According to the method, a thickness deviation-on-plate overall level in a cold rollingrolling process can be enhanced, the thickness deviation-on-plate of a cold rolling high-thickness and high-precision product is improved, the cold rolling product quality is improved, the shearing amount is reduced, and the productivity is improved; the problems that an existing control mode is poor in control effect on the thickness deviation-on-plate, the length and width of the thickness valuesituation of the strip steel whole plate cannot be comprehensively reflected, and the yield is low are solved.

The invention provides a feed water control method for restraining main steam pressure increasing in the FCB process. After a central control unit detects the FCB action, a small steam turbine drive steam source switching control module controls a steam feed pump drive steam source to be switched so that the steam feed pump drive steam source can be switched to steam from a boiler reheater cold segment from original steam turbine four-level pumped steam; after a first time interval is up, the central control unit sends a second pulse signal to a steam feed pump recycling adjusting door module, a first feed pump minimum flow valve is opened to a preset opening degree in an overriding manner and is switched into a manual control manner; and after a second time interval is up, the central control unit sends a third pulse signal to a steam feed pump rotating speed adjusting module, and the preset feed pump target output force is reduced in an overriding manner according to a preset rate. The stability of running of a water supply system is improved; and by means of quick reducing of the feed pump output force, the quick increasing of main steam pressure after the FCB action is effectively restrained, and a good basis is laid for FCB function achieving of a unit.