42results about How to "Flexible control strategy" patented technology

The invention discloses a bandwidth control method based on software-defined networking and oriented to different types of flow. By means of the method, the different types of flow are identified, intelligent bandwidth allocation schemes are provided, and the problems that as for a traditional method, control is complex and response is slow are solved. Under a SDN framework, bandwidth control of the whole network is achieved through a controller, an implementation process is simple and efficient, the bandwidth utilization rate is increased effectively, differential bandwidth allocation is provided intelligently, and the bandwidth control method is applied to bandwidth control oriented to the different types of flow in the SDN.

The invention discloses a direct driving wind power generation system based on a double SVPWM current mode convertor and a control method thereof. The system is characterized in that a permanent magnet synchro generator M1 is coaxially connected to a wind turbine M2; a stator alternated current signal output end of the permanent magnet synchro generator M1 is serially connected to a three-phase current fully controlled rectifier, a direct current inductor and a three-phase current synchronization inverter; and the fully controlled power switching tubes forming the three-phase current fully controlled rectifier and the three-phase current fully controlled inverter are fully controlled elements which respectively control with PWM11-PWM16 and PWM21-PWM26 space vector pulse width modulation signals SVPWM. The invention can simultaneously realize the variable speed control of the permanent magnet synchro generator and the synchronization control of the power grid.

The invention discloses a software defined network controller system in named data networking and a method thereof. A control plane and a data plane of the named data networking are separated by the system. The software defined network controller system comprises a storage module which is used for storing the data plane and maintaining four data structures of the data plane including a topological structure, a rule table, a push table and a routing table, wherein the control plane utilizes the data structures to control forwarding of data flow in the named data networking; a communication module which utilizes a customized communication format to establish connection between a software defined network controller of the control plane and network equipment of the data plane, maintain connection and receive and process data flow transmitted by the named data networking; and a function module API which is used for packaging functions of the storage module and is utilized to operate the storage module by an application layer so that direction of data flow is controlled.

The invention discloses a fault-tolerant power generation system for the excitation loss fault of an electric-excitation doubly salient machine, and a control method thereof. The system consists of anexcitation power circuit, an excitation power supply, a main power circuit, a main-power power supply, a controller, an energy storage capacitor, a load, an electric-excitation doubly salient machineand a position sensor, wherein the main power circuit is formed by connecting three groups of H-bridge convertors in parallel. An excitation current value is detected in real time, when an excitationloss fault is detected, the excitation power supply is cut off, the system is switched into an excitation loss fault fault-tolerant operation mode from a normal excitation operation mode, the switching tube of a main power converter is controlled to independently provide armature current required for the electric and power generation operation of the excitation loss fault so as to realize the fault-tolerant operation function of the excitation loss fault of the machine, the operation reliability of the electric-excitation doubly salient machine under various environments is improved, and thesystem is suitable to be applied to industries including aerospace, automobiles and the like.

The invention discloses a pneumatic proportion regulator based on an electromagnetic valve array, which comprises a main valve body, an upper end cover, a lower end cover, an air inlet electromagnetic valve array and an air outlet electromagnetic valve array, wherein an air cavity, an air inlet air path and an exhaust air path which are mutually separated and independent are arranged in the main valve body, the top of the main valve body is provided with a pressure sensor and a circuit board, in addition, the upper end cover is arranged on the top of the main valve body for accommodating the pressure sensor and the circuit board, the bottom of the main valve body is provided with the lower end cover, the left side and the right side of the main valve body are respectively provided with the air inlet electromagnetic valve array and the air outlet electromagnetic valve array, and the front side of the main valve body is provided with a first interface and a second interface which are respectively communicated with the air inlet air path and the air cavity. The pneumatic proportion regulator has the advantages that the control is flexible and variable, the fault redundancy is realized, the large-through-diameter and high-flow-rate air supply is realized, and simultaneously, the ideal response performance can be ensured.

The invention discloses a power supply digital control development platform which comprises a platform external interface, an input signal conditioning circuit, a power drive output circuit, a switch control output circuit and a DSC minimum system, wherein the platform external interface at least is taken as an interface between an input signal and an output signal of the development platform; the input signal conditioning circuit correspondingly and adaptively conditions a power supply analog signal and a binary signal form the platform external interface; the power drive output circuit outputs power transistor switch control signals computed and output by the DSC minimum system to the platform external interface after the power transistor switch control signals are subject to adaptive drive capability treatment; the switch control output circuit outputs the switch control signals computed and output by the DSC minimum system to the platform external interface after the switch control signals are subject to adaptive treatment; the DSC minimum system is taken as a carrier of embedded software through taking DSC as a core processor during the development to bear the operating environment of the embedded software. The invention realizes the full-digital control and has strong expansibility and good control performance.

The invention discloses a start-generation system power converter and a control method thereof. The power converter includes a three-phase full-bridge inverter module, driving circuits and a control circuit. The three-phase full-bridge inverter module consists of a MOSFET module with parasitic anti-parallel diodes. Each MOSFET corresponds to one driving circuit. The driving circuit is a compositedriving circuit. In a start mode, the driving circuit operates in a typical MOSFET driving mode and the MOSFET module achieves the function of an inverter bridge. In a generation mode, the driving circuit, in response to the strobe signal of the control circuit, selectively drives the turning on and the turning off of the MOSFET, and the MOSFET module realizes the function of a rectifier bridge. In the solution, one three-phase MOSFET module realizes the integration of a start power circuit and a generation power circuit. Through the MOSFET switching control, the on-state loss of the rectifiedoutput in the generation mode is greatly reduced and the system efficiency is improved. The power converter is easy to control and high in reliability, especially suitable for aviation low-voltage high-power starting power generation system.

The invention provides an unmanned control system for stacker reclaimers in a stockyard. The unmanned control system comprises a three-dimensional laser scanner unit, a central control machine, a stacker reclaimer automatic control system, a safety protection system and a video monitoring system, wherein the three-dimensional laser scanner unit is used for acquiring stockyard stockpile three-dimensional models; the central control machine is used for obtaining stacking and reclaiming positioning data of the stacker reclaimers according to the stockyard stockpile three-dimensional models and stacking and reclaiming strategies; the stacker reclaimer automatic control system is used for controlling the stacker reclaimers to perform automatic positioning and automatic stacking and reclaiming operation according to the stacking and reclaiming positioning data of the stacker reclaimers, operation parameters of the stacker reclaimers and the stacking and reclaiming strategies; the safety protection system is used for performing active anti-collision calculation according to data of the stockpile three-dimensional models, equipment positioning detection signals and equipment action state information so as to ensure safe operation of equipment; the video monitoring system comprises a plurality of high-definition cameras mounted on each of the stacker reclaimers; and the video monitoring system is used for observing the action of key equipment of the stacker reclaimers and collecting stockyard video information to the central control machine for centralized monitoring. The unmanned control system for the stacker reclaimers in the stockyard achieves the automatic stacking and reclaiming operation of the stacker reclaimers, and is safe, efficient and unmanned.

The invention discloses a hydraulic pump, an oil pumping unit, an oil pumping module and an oil pumping system. The hydraulic pump comprises a hydraulic cylinder body, a piston, a first hydraulic rod and a second hydraulic rod, wherein the first hydraulic rod and the second hydraulic rod are connected with the piston; and the second hydraulic rod and the first hydraulic rod extend out of the hydraulic cylinder body along opposite directions. The oil pumping unit comprises a hydraulic pump and a first oil pump which is connected on the first hydraulic rod. The oil pumping module comprises a control mechanism, a hydraulic drive mechanism and the oil pumping unit. The oil pumping system comprises one or a plurality of the oil pumping module(s). The oil outlet of each oil pumping module is connected with the main oil outlet by a pipe. The invention has the advantages of simple transmission, high transmission efficiency, simple structure, fewer parts and components, component-based design,flexible installation and configuration, high reliability and good security.

A vehicle variable cross section plate spring rolling mill computer control system employs an IBM-PC industrial control computer and a programmable controller for control, and employs a multi-modal intelligent control algorithm to obtain a good control effect; the control system is flexible in a control strategy, simple in algorithm, strong in servo tracking ability, strong in robustness, good ina control effect, and not sensitive for system parameter changes.

The invention provides a three-phase medium-low voltage integrated power distribution network voltage control method and system. The method comprises the steps of: reading original data of a power distribution network, establishing an uncertainty probability model of output and load of a distributed power supply, performing initial probabilistic load flow calculation by utilizing a two-point estimation method to obtain statistical data of the node voltage and the objective function of each phase, determining whether a voltage out-of-limit problem occurs in medium-voltage and low-voltage regions or not, and if not, returning to enter the next control period; otherwise, on the basis of probabilistic load flow calculation, establishing the three-phase voltage control model of the medium-low voltage integrated power distribution network, performing solving by using a genetic algorithm to obtain a regulation and control value of each control variable, and further controlling the medium-lowvoltage integrated power distribution network. The active control capability of the low-voltage power distribution network is fully utilized, the low-voltage power distribution network is coordinatedand controlled with the medium-voltage power distribution network to solve the problem that an original low-voltage power distribution network is passively controlled by the medium-voltage power distribution network, and the operation efficiency and the operation safety of the power distribution network are improved.

The invention discloses a flue gas circulation system for a circulating fluidized bed boiler. The flue gas circulation system comprises a leading-out flue gas circulating pipeline, a flue gas circulating branch pipe and a first electric door opening and closing door; a leading-out flue gas circulating pipeline connector is arranged at an outlet of an induced draft fan, and the first electric dooropening and closing door is arranged at the inlet of the leading-out flue gas circulating pipeline; the flue gas circulating branch pipe comprises a first branch pipe communicated with an inlet flue of an absorption tower of a desulfurization system, a second branch pipe communicated with a boiler secondary air hot air main pipe and a third branch pipe communicated with the boiler primary air hotair main pipe; the first branch pipe, the second branch pipe and the third branch pipe are correspondingly provided with electric adjusting doors; and meanwhile, the invention further discloses an operating method for the circulating fluidized bed boiler, the flue gas circulation system can be independently used for adjusting the flue gas quantity at an inlet of a circulating fluidized bed semi-dry desulfurization absorption tower, so that the stable operation of the absorption tower can be stabilized, the control of the NOx generation amount can be realized by independently adjusting the temperatures and oxygen quantities of different areas of the boiler hearth, and under the same energy consumption condition, compared with a conventional flue gas circulation system, the flue gas circulation system has higher environmental protection characteristics.

The invention relates to an excitation controller control method and system, and relates to the technical field of power system stability control. The method comprises the following steps: determiningparameters of a control strategy by using a PID control and excitation control system mathematical model; determining a preset control condition corresponding to the current state of the excitation controller by utilizing the kth sampling error value of the excitation control system, a first error difference value between the kth sampling error value and the (k-1) th sampling error value and a second error difference value between the (k-1) th sampling error value and the (k-2) th sampling error value; and controlling the output of the excitation controller by adopting a control strategy corresponding to a preset control condition corresponding to the current state. According to the excitation controller control method and system, different preset control conditions can be automatically determined according to the working state and the error condition of the excitation control system, so that the control strategy is more flexible; parameters of the excitation controller are automatically adjusted, the adaptability of the excitation controller is improved, and the control effect of the excitation control system is better.