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

The invention discloses an automatic control method of centralized cold providing system. It is a recurrent cold providing system which includes cooling water set, a frequency conversion pump, freezing water pipes net and the terminal air-condition units. The control method is that the recurrent cold proving system is disassembled many unattached control circle. A main control parameter and a regulable parameter are set in each circle. Through adjusting the parameters to adjust and control the change of the parameter, in different circles the control parameters and the regulable parameter interfere each other. The automatic control method provides a systemic solution for centralized cold providing system. It can comparatively separate the control of key equipments, such as the cold water motors, the frequency conversion pump, the adjusting valve etc. It deals with the influence of each other as a interferential variable to definitize the control target, run stably. So it can realize economizing energy and depressing the running cost.

The invention discloses an intelligent driving preview control method and device and a storage medium, and relates to the technical field of lane keeping methods.The intelligent driving preview control method comprises the following steps of using transverse deviation, course angle deviation and yaw velocity deviation between a target track point and a preview track point when a vehicle runs as state variables; constructing a cost function by taking the yaw velocity as a control quantity; calculating a minimum value of the cost function to obtain a target yaw velocity; and according to the target yaw velocity, and based on feedforward control, feedback control, adaptive compensation control and cross slope compensation of the steering wheel rotation angle, calculating a target steering wheel rotation angle to execute a control action. The multi-point preview control system is designed according to the lateral deviation, the course angle deviation and the yaw velocity deviation, the yaw velocity control quantity is introduced as the control cost, and the smoothness of lateral control of the vehicle is ensured on the basis of improving the control precision and robustness.

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 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.

A power coordination controller applied to an optical storage system is provided. A single-chip microcomputer controls a photovoltaic power generation system and a storage battery pack, the photovoltaic power generation system and the storage battery pack are connected with a load, and the power coordination controller comprises voltage acquisition circuits I and II, current acquisition circuits Iand II, a DC-DC circuit, a driving circuit and a temperature acquisition circuit; the voltage acquisition circuit I and the voltage acquisition circuit II are connected to pins PA1 and PA2 of the single-chip microcomputer; the current acquisition circuit I and the current acquisition circuit II are connected to pins PA4 and PA5 of the single-chip microcomputer; the DC-DC circuit is connected withthe single-chip microcomputer through a drive circuit, and the drive circuit is connected to a pin PA8 of the single-chip microcomputer. The temperature acquisition circuit is connected to a pin PA6of the single-chip microcomputer; the photovoltaic power generation system is connected with the storage battery pack through a DC-DC circuit; the first load forms a second load available voltage through the step-down circuit. According to the invention, cooperation between photovoltaic power supply and a storage battery charging and discharging mode in a maximum power state is realized, and long-term stable operation of a photovoltaic power generation system and a storage battery pack with a large load in a combined power supply manner is realized.

The invention discloses a self-adaptive cruise control method for an electric automobile. The method comprises the following steps: estimating sliding acceleration by adopting a multi-forgetting-factor recursive least square algorithm; establishing motion state prediction models of the front vehicle and the vehicle; designing an adaptive cruise upper-layer controller based on the sliding acceleration estimated in the step 1 and the two-vehicle motion state prediction model established in the step 2; and designing an adaptive cruise lower-layer controller according to the inverse longitudinal kinetic model of the vehicle. According to the method, the sliding acceleration is estimated online through the multi-forgetting-factor recursive least square algorithm, and the estimated sliding acceleration is introduced into the upper-layer controller established based on the model prediction control theory, so that the vehicle following performance, safety and economy are met; the minimum acceleration fluctuation and the minimum driving and braking switching frequency serve as comfort targets, the driving and braking switching frequency in the self-adaptive cruise control process can be remarkably reduced, and the comfort of the whole vehicle is improved.

The invention discloses an optimization control method suitable for UHVDC commutation failure fault recovery. The method comprises the following steps: 1, acquiring a DC voltage, a DC current, a converter turn-off angle and a bus phase voltage of an AC system at an inverter side of a UHVDC system in real time; 2, constructing dynamic current margin control by using a difference value between a rectification side-direct current instruction value and an inversion side direct-current measurement value and a slope of a current margin function; and 3, after the fault is cleared, through the inverter side converter, adopting constant current control to make the dynamic current margin control take effect, so that the current margin in the fault recovery process is reduced. According to the method, the direct-current control target in the UHVDC system low current recovery process can be determined, so that the probability of unstable recovery of the system caused by improper interaction of the rectification side constant current controller and the inversion side constant current controller is reduced, and the subsequent commutation failure generated in the UHVDC fault recovery process is effectively inhibited.

The invention discloses a graded control and running method of a No.0 high-pressure heater of a power plant set. The method comprises the following steps of making a control target of the No.0 high-pressure heater clear and definite; secondly, carrying out modular division on multiple working conditions of running of the No.0 high-pressure heater; and thirdly, dividing a control process into threestages of control. The method can be suitable for full-automatic operation putting of the No.0 high-pressure heater under the multiple working conditions of the set, meanwhile, the multiple working conditions in the set can be subjected to modular distinguishing, the aims of graded response and precise control are achieved, the adjusted amount runs in an optimum interval, meanwhile, for an abnormal working condition, in-advance early warning and accurate alarm giving can be achieved, rapid response is achieved, and the whole economy and safety of the set can be obviously improved.

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 production process for eliminating boron micro-alloying hot-rolled steel strip edge faults is characterized by meeting key control conditions that when content of [B] in steel is smaller than 0.0013%, content of [Mn] is larger than or equal to 0.35% while content of [S] is smaller than or equal to 0.005%; when content of [B] in steel is larger than or equal to 0.0013% and smaller than or equal to 0.0020%, content of [Mn] is larger than or equal to 0.40% while content of [S] is smaller than or equal to 0.005%; the content of molten steel N of continuous casting tundish is controlled to be smaller than or equal to 60ppm; the corner temperature of continuous casting billets in a straightening area of a segment is over 1000 DEG C so that a brittleness temperature range of 850-950 DEG C is avoided; the content of molten steel P is controlled to be smaller than or equal to 0.015% while the content of C is out of the range of 0.09-0.17%. By the production process, control target is clear, operations can be realized easily and conveniently, corner transverse cracks caused by boron micro-alloying of the continuous casting billets can be eliminated completely, manual operations of checking and cleaning the corner faults of the billets are omitted, qualified steel strip products can be rolled directly, production processes are simplified, energy consumption is reduced, labor intensity of workers is lowered, and product quality is stable and reliable.