57results about How to "Simple control technology" patented technology

The invention relates to a comprehensive method for vector or direct torque control of a doubly-fed wind generator and belongs to a comprehensive method which uses the vector control when the doubly-fed wind generator is in a stable operation state and uses the direct torque control when the doubly-fed wind generator is in a wind power generating transient state. The comprehensive method mainly solves the technical problems existing in the prior wind generator control method that the transient swing is hard to control due to the sudden change of wind force. The technical proposal comprises the following steps: a) establishing a conventional vector control mathematical model of the doubly-fed wind generator in the stable operation state, due to the control of component voltage and current on the d and q axes by pulse width modulation(PWM), controlling the AC exciting current frequency of the wind generator by a grid electrode of a bipolar triode switch of a corresponding isolated gate in an adjusting converter, and realizing the super-synchronous and sub-synchronous variable speed constant frequency power generation of the wind generator; and b) in the wind power generating transient process, using the doubly-fed wind generator controlled by the method of the direct torque control of the wind generator.

The invention relates to a comprehensive method for vector or direct torque control of a permanent magnetism type wind generator, and belongs to a comprehensive method which uses the vector control when the permanent magnetism type wind generator is at a stable operation state and uses the direct torque control when the permanent magnetism type wind generator is in a wind power generating transient state. The comprehensive method mainly solves the technical problems existing in the prior wind generator vector method that the transient swing is hard to control due to the sudden change of wind force. The technical proposal comprises the following steps: a) establishing a vector control mathematical model of the permanent magnetism type wind generator in the stable operation state, due to the control of component voltage and current on the d and q axes by pulse width modulation(PWM), controlling the AC exciting current frequency of the permanent magnetism type wind generator by a grid electrode of a bipolar triode switch of a corresponding isolated gate in an adjusting converter, and realizing the control of the permanent magnetism type wind generator in a stable wind state; and b) in the wind power generating transient process, using the permanent magnetism type wind generator controlled by the method of the direct torque control of the permanent magnetism type wind generator(WGDTC).

The invention relates to an excitation control method of a doubly-fed wind-driven generator. The doubly-fed wind-driven generator has a doubly-fed motor. The motor includes: a stator, which supplies power for a power grid having a voltage with a rated value; and a driving rotor, which is coupled with the stator. One end of the rotor is connected with a wind turbine by a change-speed gear. A rotor winding is a three-phase wound rotor winding. The power grid supplies power for the rotor by a current transformer; and a stator voltage and a stator linkage are deposed on an xsynchronization rotation dq coordinate axis; therefore, it can be realized that power output by the generator stator is controlled by adjusting the rotor current. According to the method provided in the invention, there is no need to carry out complex conversion and calculation like vector rotation changing and the like; active and reactive decoupling control can be realized; a current control module has low control sensitivity; a circuit parameter and measurement time delay of a current transformer system has a little influence on current control; and the control technology is simple and thus cost of the controller is reduced.

The invention provides a flight device control system, which comprises a first instruction input system and a second instruction input system. The first instruction input system comprises a camera subsystem and an image processing subsystem. The camera subsystem is arranged on a flight device main body and is used for obtaining image and/or video information; the image processing subsystem is used for processing the image and/or video information to obtain position information of one or more main bodies in images and/or videos; and the image processing subsystem is connected with an instruction processing unit and is used for transmitting the position information, serving as an instruction, to the instruction processing unit. The flight device control system and control method combine two control modes, thereby simplifying control technique of a flight device, enhancing system shooting stability, and meanwhile, preventing the defect that an existing full-automatic following control mode is monotonous and unattractive, providing more interest for flight shooting and meeting special functions, such as self-shooting of an operator.

The invention relates to a mobile robot chassis and a mobile robot. The mobile robot chassis comprises a chassis frame provided with a rotating frame, a first driving device arranged on the rotating frame and a traveling mechanism connected with the driving device and driven to move by the driving device. The traveling mechanism comprises a first driving wheel, a second driving wheel and a drivenwheel, wherein the first driving wheel and the second driving wheel are differential wheels, and the driven wheel is a universal wheel; the first driving wheel and the second driving wheel are arranged on opposite sides of the lower end of the rotary frame, and the driven wheel is arranged on the bottom of the chassis frame. The chassis of the mobile robot of the invention adopts the differentialwheels as the driving wheels and the universal wheel as the driven wheel, thus the manufacturing cost is low and the control technology is simple; at the same time, the origin locking mechanism is designed. When the origin locking mechanism locks the rotating frame, the mobile robot chassis becomes the differential chassis. When the lock is unlocked, the mobile robot chassis becomes the omni-directional moving chassis, which realizes the switching of different motion modes and has higher flexibility.

The invention discloses an indicating method and system for a scanning area. The method comprises steps as follows: according to a predetermined scanning mode of a current patient, the scanning area corresponding to the patient is estimated, and a table board position corresponding to the scanning area is determined; the scanning area comprises a scanning starting position; according to the correspondence between the table board position and LED indicating lamps arranged on at least one side of a table board, the LED indicating lamps corresponding to the scanning area are controlled to be lit in the set manner; an indicating interval of the lit LED indicating lamps is used for indicating the position, located on the table board, of a to-be-scanned part of the current patient; when the position, located on the table board, of the to-be-scanned part of the current patient is determined to be consistent with the indicating interval of the lit LED indicating lamps, the table board position, corresponding to the scanning starting position, of the table board of a examining table is controlled to move to an exposure starting position of a CT (computed tomography) machine. According to the technical scheme, the use efficiency of the CT machine can be improved.

The present invention discloses one kind of wind driven engine with combined wind cups and blades, and aims at improving the operation mode of wind driven engine. The wind driven engine has one main shaft with one or several sections, and one set of arms mounted on the main shaft and with at least one wind cup-blade capable of changing upwind angle each. The wind driven engine may be driven with wind in any direction and has high efficiency, simple structure and easy control. The present invention may be used in various kinds of energy converter.

The invention discloses a method for controlling the active power of a double-fed wind power generator. The double-fed wind power generator has a double-fed motor, wherein the double-fed motor has a stator and a driving rotor; the stator supplies power to a power grid; the power grid has a voltage with a rated value; the driving rotor is coupled with the stator; one end of the driving rotor is connected to a wind turbine through a speed-changing gear; rotor windings are three-phase coiling type rotor windings; the power grid supplies power to the driving rotor through a converter; and by decomposing a stator voltage and a rotor flux linkage on a synchronously rotary dq coordinate axis, the active power which is output by the stator of the generator can be controlled by regulating a rotor current. The method has the advantages that: the complicated conversion and calculation of vector rotation change and the like are not required; a current control module is relatively lower in controlsensitivity; current control is less influenced by circuit parameters of a converter system and measurement delay; a control technology is simple; the cost of a controller is reduced; and the method is applicable to a low-power wind power generator.

The invention discloses an aircraft emergency control device and a control method. The aircraft emergency control device includes a communication signal receiving and feedback module (1) and an aircraft control system processor (2); the communication signal receiving and feedback module (1) receives instruction signals sent by a ground base station or instruction signals sent by a satellite, and transmits the received signals to the aircraft control system processor (2); the aircraft control processor system comprises a microprocessor module (3) and an emergency control module (4); and the output end of the microprocessor module (3) is connected with the input end of the emergency control module (4), so that an aircraft can enter a preset emergency flight mode. According to the aircraft emergency control device and the control method of the invention, the communication signal receiving and feedback module is just additionally adopted, and the combinations of various kinds of communication signals or key combinations which are simple in logic are adopted in cooperation, and therefore, flight control can be performed on the aircraft losing remote control signals, and the crash of the aircraft due to being out of control can be avoided.

The invention relates to a comprehensive method for vector and direct torque control on a doubly-fed wind generator, and belongs to a comprehensive method which uses vector control when the doubly-fed wind generator is in a stable operation state and uses direct torque control when the doubly-fed wind generator is in a wind power generation transient state. The invention mainly aims to solve the technical problem existing in the prior wind generator control method that the transient swing is hard to control due to the sudden change of wind force. According to the technical scheme, the method comprises the following steps: a) establishing a conventional vector control mathematical model of the doubly-fed wind generator in the stable operation state, and adjusting the gate of a corresponding insulated gate bipolar triode switch in a converter through control on component voltage and current of the d and q axes by pulse width modulation (PWM) so as to control the AC exciting current frequency of the wind generator and to further realize super-synchronous and sub-synchronous variable-speed constant-frequency power generation of the wind generator; and b) controlling the doubly-fed wind generator by a wind generator direct torque control method in the wind power generation transient state. The drawing shows the principle control diagram of the invention.

The invention relates to a high-rigidity two-plate die locking mechanism which comprises a fixed die plate, a moving die plate and four pull rods, wherein after correspondingly penetrating through four through holes I formed in four corners of the fixed die plate, the fixed ends of the four pull rods are spirally connected with four pull rod nuts correspondingly, and then connected onto the fixeddie plate; after correspondingly penetrating through four through holes II formed in four corners of the moving die plate, the moving ends of the four pull rods are fixedly connected onto four brake mechanisms arranged on the outer side of the moving die plate correspondingly, and then the moving die plate is connected to the fixed die plate along the reciprocating motion of the four pull rods relative to the fixed die plate; the four pull rod nuts are all connected to one and the same driving mechanism through one and the same transmission mechanism; and under the drive of the driving mechanism, the positions of the four pull rods on the fixed die plate are synchronously adjusted. According to the high-rigidity two-plate die locking mechanism provided by the invention, the brake positiondifference which needs to be compensated for due to the different die thicknesses can be automatically compensated for by slightly adjusting the relative position between the four pull rods and the fixed die plate, and then the influence of the compressibility of hydraulic oil on the rigidity of the high-rigidity two-plate die locking mechanism can be reduced to the minimum.

The invention relates to a temperature control method of a hydrogen catalysis combustor, and belongs to the technical field of hydrogen catalysis combustion. The control process of the temperature control method of the hydrogen catalysis combustor includes the steps that firstly, a data processor collects the outlet temperature of the hydrogen catalysis combustor through a temperature sensor; secondly, the data processor records the temperature change of the hydrogen catalysis combustor and compares the temperature change with a set value; and thirdly, the data processor conducts carries out feedback regulation on the fuel-air ratio of hydrogen and air according to the comparison result of the temperature of the catalysis combustor and the set value. The temperature control method has the beneficial effects of being simple in control technology, convenient to use, stable, reliable, economical, affordable, low in cost, wide in application range and the like, and can be widely used for temperature control of the hydrogen catalysis combustor.

The invention discloses a front-rotating rear-driving robot chassis and a moving robot, belongs to the technical field of mobile robots, and aims to solve the technical problem of how to widely apply the robot to complex road condition environments such as outdoor roads and parks. The robot chassis comprises a front-drive steering system and a rear-drive system, wherein the front-drive steering system and the rear-drive system are connected with wheels to achieve movement and steering of the robot chassis; a suspension system, wherein the front-drive steering system and the rear-drive system are respectively connected with the suspension system, and are used for bearing the load of the robot and absorbing shock, so that tires can uniformly touch the ground when the robot passes through a bumpy road surface; a frame system, which is in supporting connection with the front-drive steering system, the rear-drive steering system and the suspension system and bears a chassis load and an external load; and a wheel system, which is used for bearing a chassis load and an external load, realizing steering of the robot according to action requirements of the front-drive steering system and driving the robot to run according to control of the rear-drive system.

An application or utility vehicle for a spatially limited area of use comprises at least one electric motor (26) for driving the vehicle, at least one accumulator (30) for providing electrical energyfor the electric motor (26) and at least one internal combustion engine (32), in particular a diesel engine for driving at least one working machine (34) associated with the utility or commercial vehicle. The internal combustion engine (32) is also set up to charge the accumulator (30).