30results about How to "Short transition" patented technology

The invention provides an active disturbance rejection control-based method for controlling synchronization of a photovoltaic power generation system. The photovoltaic power generation system is a non-linear system, influenced by power grid and environment and strongly disturbed by the outside and has nonlinear uncertain factors. According to the work characteristics of the system, the active disturbance rejection control technology is adopted to realize effective control of the system. The system dynamically observes the uncertain factors in the system model and external disturbance by utilizing an extended state observer of an active disturbance rejection controller (ADRC) to ensure that the system has good adaptability to disturbance, can adapt to changes of an object model and the surrounding environment in a large range without influencing the control quality of the controller, and represents well robustness.

The invention discloses a fast self-learning improved ADRC control method for a non-linear system, which comprises the following steps: S1, creating an active disturbance rejection controller (ADRC) which includes a tracking differentiator (TD) part, an extended state observer (ESO) part, a non-linear state error feedback (NLSEF) part and a disturbance compensation part, wherein S1 includes S11, establishing a tracking differentiator (TD) control model, S12, establishing an extended state observer (ESO) control model, S13, establishing a non-linear state error feedback (NLSEF) control model, and S14, establishing a disturbance compensation control model; S2, creating a self-learning active disturbance rejection controller (SADRC): applying a self-learning method to the non-linear state error feedback (NLSEF) control model to establish a self-learning non-linear active disturbance rejection control system model; and S3, creating a fast self-learning active disturbance rejection controller (FSADRC): designing a learning rate oriented adaptive mechanism by using an additional momentum term method and establishing a fast self-learning model based on dynamic adaptive learning rate.

The invention discloses a grid-connection and off-grid seamless switching control method for an energy storage inverter, and relates to the field of a microgrid or a distributed type power generation system. A control system and an energy storage apparatus are included; when the inverter is in a grid-connection state, a dual-closed-loop feedforward decoupling control system (ADRC control) is adopted; when the inverter is in an off-grid state, a load end voltage is maintained by the inverter, and the dual-closed-loop feedforward decoupling control system (ADRC control) is adopted; and when the inverter is between the grid-connection state and the off-grid state, the switching process is performed in three stages, and automatic seamless switch between the grid-connection state and the off-grid state is performed. The grid-connection and off-grid seamless switching control method has the beneficial effects that the hardware apparatus is simple to design, and the software programming is popular and easy to understand; different ways are adopted for active off-grid switching, passive off-grid switching and grid-connection switching with initial phase difference, so that seamless and non-impact switching is realized; in addition, high-speed data calculation capacity and data handling capacity of a computer are utilized, thereby greatly improving the reliability of the control system.

The invention discloses a construction method conversion construction method of a super-large-span tunnel in a V-level to IV-level surrounding rock section. The elevation of an excavation arching lineis controlled to be consistent; in transition section construction, a left pilot tunnel temporary middle wall and a right pilot tunnel temporary middle wall on the two sides of a pilot and a rear pilot in a surrounding rock double-side-wall pilot tunnel method simultaneously move towards the middle of the tunnel until the left pilot tunnel temporary middle wall is in contact with the right pilottunnel temporary middle wall, and foot locking anchor rods are applied to the two sides of a temporary inverted arch; and then the right pilot tunnel temporary middle wall is removed, and the left pilot tunnel temporary middle wall is reserved as a middle temporary middle wall of a CRD method. According to the method, a double-side-wall pilot tunnel method is transversely transited to the CRD method through a gradual change method, the time interval between construction method conversion is avoided, and disturbance of later removal of temporary supports of the double-side-wall pilot tunnel method to surrounding rock is reduced; and therefore the construction speed is increased, the construction period is shortened, enforced idleness due to poor organization of work is avoided, and economicbenefits of tunnel construction are improved.

The invention relates to a vehicle safety control device for preventing an accelerator from being stepped on mistakenly. The vehicle safety control device is characterized in that a magnet is arranged on the lower surface of the other head of an accelerator control lever; a passive accelerator control lever is arranged below the magnet; the passive accelerator control lever and the accelerator control lever are coaxially hinged to a car body and are absorbed on the lower surface of the magnet in virtue of the attractive force of the magnet; the lower surface of the passive accelerator control lever is connected with an accelerator inhaul cable; a normally open push button switch for providing a braking signal and/or a flameout signal is further arranged on the passive accelerator control lever, and the normally open push button switch comprises a pair of electrical contacts and a button, wherein the button comprises a pull rod and a compression spring sleeving the pull rod, the upper end of the pull rod passes to approach the upper surface of the passive accelerator control lever, and the tension of the compression spring is overcome under the action of the attractive force of the magnet so that the pair of electrical contacts are at a normally open state. The vehicle safety control device not only ensures the safety when the accelerator is stepped on mistakenly but also does not influence high-speed running of vehicles under normal circumstances.

A vehicle control device includes a map database and at least one electronic control unit. The electronic control unit is configured to calculate a reference arrival position based on a target time or a target distance. The at least one electronic control unit is configured to determine, according to the map information or the external situation at the reference arrival position, as a target arrival position, a position where the vehicle arrives on the potential route in a time different from the target time or over a distance different from the target distance. The at least one electronic control unit is configured to calculate a transition route from the road position to the target arrival position, and generate the target route by connecting the transition route and the potential route following the target arrival position.

The invention belongs to the technical field of safety guarantee of extra-high-voltage alternating-current power grid electrical equipment, and particularly to a direct-current magnetic bias real-timecalculation method for extra-high voltage transformer parallel winding series resistance compensation. The method comprises the following steps: constructing three-dimensional geometric models of three transformers and a direct-current magnetic bias calculation magnetic field model according to actual structural parameters of a main transformer, a voltage regulation transformer and a compensationtransformer of the extra-high voltage transformer; calculating a self-inductance value when different currents flow through each transformer winding and a mutual inductance value between the windings; in combination with an electrical connection relationship among the three transformers, establishing an overall direct-current magnetic bias equivalent circuit calculation model of the three transformers through series resistance compensation voltage; solving the direct-current magnetic bias circuit model by using a fourth-order Runge-Kutta method of inductance parameters; multiplying the instantaneous current value of the branch where the series resistor is located by the increased series resistor to perform voltage compensation; and calculating the voltage and current values of each transformer and carrying out FFT (Fast Fourier Transform) to obtain the voltage and current harmonic condition of each transformer under the direct current magnetic bias of the extra-high voltage transformer.

Provided is a level shift circuit for a driving circuit. The level shift circuit includes: a cross-coupled transistor pair, for receiving a first input signal and a second input signal and for providing a first output signal and a second output signal; a first transistor, coupled to a first power supply and to the cross-coupled transistor pair, further receiving a first control signal; a second transistor, coupled to the cross-coupled transistor pair and for receiving a second control signal; and a third transistor, coupled to the cross-coupled transistor pair and for receiving the second control signal. The first control signal, the second control signal, the first output signal and the second output signal are all referenced to the first power supply, and the first input signal and the second input signal are referenced to a second power supply lower than the first power supply.

An inverter control system based on active disturbance rejection control theory, which is composed of a sampling circuit, a drive circuit, an ADRC controller, an I/O conversion module and a PWM generator; its control method is: establish a control quantity model, collect The signal is sent to the ADRC controller, the control law is obtained, and the control signal is output; its advantages are: 1. It has good control quality for nonlinear and complex systems, and has good anti-interference ability; 2. Small overshoot , The transition process is short, it can adapt to the changes of the object model and the surrounding environment in a wide range, and does not affect the control quality of the controller, and has good robustness.

The invention discloses an energy-saving type hydraulic escalator which comprises a controller, a descending escalator part, an ascending escalator part, a first variable displacement motor, a second variable displacement motor and a reversing valve; the first variable displacement motor and the second variable displacement motor are each provided with a pump working condition and a motor working condition; the first variable displacement motor, the second variable displacement motor and the reversing valve form a hydraulic circuit; an output shaft of the first variable displacement motor is connected with a transmission shaft of the descending escalator part; an output shaft of the second variable displacement motor is connected with a transmission shaft of the ascending escalator part; when the descending speed of the descending escalator part is greater than a preset threshold, the reversing valve is positioned in a first station, an oil inlet of the reversing valve communicates with a pump working condition oil port of the first variable displacement motor, and an oil return port of the reversing valve communicates with a motor working condition oil port of the first variable displacement motor; and when the descending speed of the descending escalator part is less than a preset threshold, the reversing valve is positioned in a second station, the oil inlet of the reversing valve communicates with a motor working condition oil port of the first variable displacement motor, and the oil return port communicates with a pump working condition oil port of the first variable displacement motor. The gravitational potential energy of the descending escalator part is converted to pressure energy used for driving the ascending escalator part to operate, an energy conversion link is brief, the conversion efficiency is high, no additional space is occupied, and the cost is low.

The invention provides a dynamic area optimization and control system of glue blending and applying process production of a planed fiber artificial board. The system realizes glue mixing by dynamic proportioning and dynamic glue applying process control in a constant proportion through specific value follow-up adjustment, dynamic area optimization and a high-precision fluid control technology, thereby improving the constant proportion glue applying precision and the glue mixing proportioning accuracy. The process control system comprises a parallel glue mixing mechanism consisting of a gas injector, a pipeline, a flowmeter, a pump valve, a pot group, and the like, an on-line glue applying mechanism and a fully-automatic glue mixing and applying control system consisting of a sensing and detecting module, an intelligent calculating module, a flow control module, a management module, a communication module, a diagnosis and alarm module, and the like. Control methods mainly comprise a dynamic specific value follow-up adjustment method, an area liquid level optimum control method and a pseudo-differential feedback flow control method. The invention improves the dynamic stability of the glue mixing and applying system and realizes the accuracy control of the glue mixing and applying process, thereby improving the product quality, reducing glue liquid and raw material loss and improving the automatic and continuous production and the productivity level of equipment.

The invention provides an improved control scheme for increasing the controllability of the GSC by dynamically adjusting the voltage of a DC bus during high voltage penetration, aiming at solving the problems that the transient overvoltage of a power grid easily causes that the grid-side converter of a direct-driven fan reaches the upper limit of the AC voltage regulation, so that the AC/DC power coupling oscillation is caused, and the instability or overvoltage generator tripping protection is caused. According to active control, the VSG technology is improved, a power compensation item is designed, system frequency support is added externally, and bus voltage fluctuation is reduced internally; reactive control is based on industrial standards, and voltage recovery is supported by injecting reactive current into a power grid. The improved control effectively improves the fault continuous ride-through capability of the unit, improves the power generation efficiency and the electric energy quality of the fan, and improves the system stability.

A movable medium-low-voltage circuit breaker drive device for permanent magnets is composed of a separating brake winding, movable iron cores, the permanent magnets, a fixing device, a closing winding, a static iron core and a driving connecting rod. The separating brake winding winds the upper portion of the static iron core, and the closing winding winds the lower portion of the static iron core. The movable iron cores are of an I-shaped structure. The permanent magnets and the fixing device are embedded in the movable iron cores in a surrounding mode, the fixing device is embedded in the middle of the movable iron cores, and the two permanent magnets are embedded in the movable iron cores at the two ends of the fixing device respectively. The driving connecting rod and the movable iron cores are connected into a whole. According to the movable medium-low-voltage circuit breaker drive device, the permanent magnets are embedded in the movable iron cores, the permanent magnets and a winding magnetic field act together, the separating-closing transition process is simplified, and the limit steady state is obtained rapidly. The movable medium-low-voltage circuit breaker drive device can be used in protection of transformer substations of electrical power systems, rail traction substations and various feeders.

The present invention discloses a generator voltage regulator on the basis of a digital signal processor control. The generator voltage regulator on the basis of the digital signal processor control comprises a digital signal processor, a memory, a timer, an analog-to-digital converter, a digital input interface, a second digital output interface, a power amplification circuit and a power tube. The memory, the timer, the analog-to-digital converter, the digital input interface, the digital output interface are connected with the digital signal processor, the power amplification circuit is connected with the digital output interface, and the power tube is connected with the power amplification circuit. The generator voltage regulator on the basis of digital signal processor control performs voltage regulation in the control of a digital signal processor and has small overshoot and short voltage buildup time when a generator builds voltage; when the generator is changed in work state, the transition process is short; and when the generator works normally, the stable state error is small.