30results about How to "Good dynamic and static characteristics" patented technology

The invention belongs to the technical field of building construction equipment, and relates to a device and method for testing pile-soil interface soil pressure and pore water pressure. Silicon piezoresistive earth pressure gauges and silicon piezoresistive pore water pressure gauges are symmetrically mounted on different sections and at different pile ends on the outer side wall of the high-strength prestressed concrete pipe pile in an embedded manner; pile body drill holes are formed in the inner side of the top of the high-strength prestressed concrete pipe pile; armored cables are communicated with a high-speed static strain indicator YE2539 through the pipe body drill holes; the pile end of the high-strength prestressed concrete pipe pile adopts a steel plate to cover the bottom; the silicon piezoresistive earth pressure gauges and the silicon piezoresistive pore water pressure gauges arranged at the bottommost end are mounted at the bottom of the steel plate, and the gaging heads face downwards. Grooves matched with the armored cables are formed in the steel plate. The device is simple and compact in structure, small in size, light in weight, low in cost, convenient to operate, firm and durable, has excellent dynamic-static features, and is wide in measurement range, and high in measurement accuracy and sensitivity, and easily realizes the test on the soil pressure and pore water pressure at the pile-soil interface adjacent to the pile body.

The invention belongs to the field of controlling power converters of wind power generation systems and relates to a deadbeat power control method for a grid-side converter under network voltage unbalance. The deadbeat power control method comprises the steps that three-phase network voltage, a three-phase alternating side current and direct current side voltage of the grid-side converter are detected, a network voltage sampling value and an alternating side current sampling value under a two-phase rest frame through 3 / 2 coordinate transformation, and network voltage retardation is obtained by delaying one fourth of a power grid period of the network voltage sampling value; an active power reference value is calculated, and an alternating side current reference value is calculated and obtained; transformer alternating current side voltage controlled by the deadbeat power is calculated; in order to compensate for time delay in the calculation and control process, the transformer alternating current side voltage at the next moment is predicted and serves as control voltage; a switch signal controlling a power switch component is obtained and is used for controlling on-off sequence and on-off time of the power switch component. According to the deadbeat power control method for the grid-side converter under network voltage unbalance, the grid-side converter can be effectively controlled to have good dynamic and static characteristics under the condition of network voltage unbalance, and reliable grid connection operation of a wind generating set is ensured.

The invention discloses a torque fluctuation compensation controller for a hybrid vehicle belt-type drive starter generator (hereinafter referred to as BSG) and a construction method thereof. The torque fluctuation compensation controller controls the compound controlled object, and the rotating The torque fluctuation compensation controller includes a PI regulator, an extended inverter control module and a current compensation module, and the composite controlled object includes a hybrid electric vehicle BSG, a photoelectric encoder disc, and a calculation module for rotational speed and electrical angle; the neural network is used to construct The current compensation module, the neural network adopts a four-layer structure, and uses the Powell algorithm to train the neural network. The method of the present invention can effectively suppress the current harmonics of the BSG motor by using the neural network to identify the current compensation module, significantly Reduce the torque ripple of the motor, so that the BSG system of the hybrid electric vehicle has good dynamic and static characteristics and strong robustness.

The invention discloses a method used for prediction convergence control of inductive current in a booster circuit. The method includes: predicting an inductive current value of a next moment through an inductive current value iL(n-1) of a previous moment; predicting to acquire a value of a duty ratio of a switch tube at an nTS time moment according to power conservation; subjecting a calculation result to convergence processing according to a steady-state expected value; predicting to acquire an average value of the duty ratio of the switch tube and the duty ratio of the switch tube in a steady state in the process of convergence so as to acquire a final duty ratio Dx(n) of the switch tube and generate PWM (pulse width modulation) with the duty ratio of Dx(n) to control the switch tube to realize control on inductive current. By the method, the duty ratio of the switch tube is calculated quickly by taking the inductive current as controlled amount; when a given is suddenly increased or reduced, the given can be tracked quickly, so that an algorithm can acquire good dynamic-steady state characteristics.

The invention discloses an aircraft power generation control device. The high-speed digital input module is used to collect the rotational speed of the driving shaft of the aircraft generator set, and can collect pulse signals with a frequency higher than 100KHz; the high-precision analog input module is used to collect the aircraft generator set. The power generation power and the valve position displacement of the fuel regulating valve, the acquisition accuracy is higher than one ten-thousandth; the PWM output module is used to use the algorithm of PWM current control to output the control amount to the fuel regulating valve to realize the control of the valve opening; The core control module includes an adaptive fuzzy PID control module to control the speed, power and valve position displacement. The invention adopts the self-adaptive fuzzy PID module to control the speed, power and valve position displacement, has strong self-adaptability to environmental changes, and can automatically correct the controller in a random environment, so that the system characteristic changes or is disturbed. , the aircraft power generation system has good dynamic and static characteristics, which meets the control requirements of the aircraft power generation system.

The invention discloses a feedback linearization sliding-mode control method of a three-phase three-wire system shunt active power filter. According to the control system, an indirect current control method is adopted, and reference supply current is selected as a reference signal for current tracking control. The feedback linearization technology is used for controlling direct current-side voltage of the shunt active power filter. An integral position tracking sliding-mode control is used for tracking control of the reference signal. The problem that the computing method of a sinusoidal signal in traditional unit is inapplicable in case that the harmonic content of the power voltage is higher is solved. According to the feedback linearization control method, the control of the direct current-side voltage is realized, and the system has good dynamic and static characteristics and possesses good adaptability to variation in load. With the adoption of an integral position tracking sliding-mode controller, the harmonic content of the power current after being compensated can be effectively reduced, and the harmonic compensation effect of the active filter can be improved. The whole control system of the active filter is simple in structure and easy to realize, and has good theoretical and practical significance.

The invention provides a direct power control method of a voltage source PWM (pulse width modulation) rectifier system. Based on an inner-loop power and outer-loop voltage control method adopted in a DPC (data processing control) method, set values of active power and reactive power are compared with actual values, and a voltage vector is selected by querying a switch list to control the on-off state of the PWM rectifier. According to the control method provided by the invention, a state variable marking the active power and the reactive power is added, the location of a space vector is redefined and a segmented switch list is constructed, thus enhancing the decoupling control on the active power and the reactive power and the response capability, and improving the power factor of the rectifier. The calculation and experiment results show that the grid side input current is sine and the instantaneous power dynamic and static control characteristics of the system are better.

The invention discloses a gypsum board cut-to-length control method which comprises the steps of (a) on-line-measuring the speed VI and the length L of the movement of a gypsum board; (b) sequentially dividing knife roll circumferential rotary speed into three speed regions; and (c) controlling the edge of an upper knife roll and the edge of a lower knife roll to exactly engage with each other when the actual length L of the movement of the gypsum is equal to a give length L', so as to shear off the gypsum board in the synchronous region BC according to the given length. The invention furtherdiscloses a gypsum board cut-to-length control system which comprises a detection part, a central processing part and a motor control part. The method controls the edges of the knife rolls to better rotate circumferentially, thereby greatly improves the shearing precision of the fixed length of the gypsum, and the shearing precision can reach up to 0.67%. The system has the advantages of dynamic and static state properties, high precision, stable system ad satisfaction for technique requirements.