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34results about How to "Reliable development" patented technology

Implicit-projection-based method for simulating stability of active power distribution system

The invention discloses an implicit-projection-based method for simulating the stability of an active power distribution system. According to an active power distribution system stability simulation model with the rigidity characteristics, based on system simulation parameters and load flow calculation results, the implicit-projection-based method includes the steps that firstly, a plurality of steps of small-step-length integral calculation are carried out through an internal integrator, wherein the step length is h, and any explicit integral algorithm with the accuracy higher than the second order can be adopted; secondly, a step of large-step-length integral calculation is carried out with the step length Mh through an external integrator based on an implicit prediction-correction method according to the calculation result of the internal integrator. By means of the implicit-projection-based method, simulating calculation of system faults can be achieved, the implicit-projection-based method is a second-order accuracy algorithm and has the good numerical stability, a numerical stability domain of the implicit-projection-based method is hardly changed along with changes of the multiple of the step length of the external integrator, the performance of the algorithm is better than that of the explicit projection integral algorithm and that of a traditional implicit trapezoidal method, the implicit-projection-based method is suitable for rapidly achieving the aim of simulating the stability of the active power distribution system with the multi-time scale characteristics, and a foundation is laid for efficiently and reliably developing an active power distribution system simulation program.
Owner:TIANJIN UNIV +2

Cement combination semi-finishing grinding optimization control system and cement combination semi-finishing grinding optimization control method

The invention discloses a cement combination semi-finishing grinding optimization control system. The cement combination semi-finishing grinding optimization control system comprises a data acquisition subsystem, a data analyzing subsystem, a DCS control subsystem, and a centralized control subsystem. The data acquisition subsystem is used to acquire parameters of cement production key equipment in DCS and particle size parameters analyzed and processed by a particle size analyzer. The data analyzing subsystem is used to determine whether cement particle size distribution is reasonable according to data acquired by the data acquisition subsystem, and according to the cement particle size distribution condition, the cement production key equipment is selected to be adjusted, so that the cement particle size tends to be normal, and by using the data analyzing subsystem, the adjusting amplitude of the cement production key equipment is provided. The cement key equipment is adjusted by the DCS control subsystem according to a result acquired by the data analyzing subsystem, and therefore objects of reasonable cement particle size distribution and stable quality are achieved. The invention also provides a cement combination semi-finishing grinding optimization control method.
Owner:UNIV OF JINAN +1

Programmable double fieldbus conversion interface and method

The invention discloses a programmable double fieldbus conversion interface and a method. An NCUC and Profibus-DP fieldbus conversion interface device is supported. Meanwhile, connected serial port communication equipment or internet access communication equipment can be in reliable communication with equipment supporting the NCUC or Profibus-DP fieldbus through the interface conversion device, and heterogeneous network interconnection is achieved. An STM32F103RET6 microcontroller is adopted and is a 32-bit high-performance microcontroller, a specialized Profibus-DP protocol chip is adopted, communication between user data and the Profibus-DP bus is achieved, and the processing speed is higher. The function of connecting the serial port equipment and the internet access equipment into the NCUC fieldbus and the Profibus-DP fieldbus for communication is achieved. The advantages of being high in processing speed, high in flexibility, reliable in communication and the like are achieved, the design complexity of an industrial field NCUC and Profibus-DP slave station can be reduced, the technical threshold of using the NCUC and the Profibus-DP for a user can be lowered, the development cost can be reduced, and product integration and fast product development are promoted.
Owner:WUHAN UNIV OF TECH

Error estimation and parameter adaptive adjusting method suitable for implicit projection algorithm

The invention provides an error estimation and parameter adaptive adjusting method suitable for an implicit projection algorithm. The numerical stability domain of the implicit projection algorithm and the numerical stable characteristic that parameters M of the implicit projection algorithm are irrelevant basically are utilized sufficiently. The error estimation and parameter adaptive adjusting method is used for a stability simulation model of an active power distribution system with a rigid feature, events such as faults and switch operation which are possibly caused in a simulation process are considered, calculation errors of projection integration steps of the implicit projection algorithm can be subjected to prior estimation and posterior estimation respectively according to a prior error estimation method and a posterior error estimation method, and simulation errors of the projection algorithm are controlled by adaptive change of the parameters of the algorithm; compared with the implicit projection algorithm with fixed parameters, the implicit projection algorithm has obvious advantages; particularly, the problem on stability simulation of a large-sized active power distribution system with remarkable multi-time scale features can be quickly and accurately solved under the condition of large-disturbance motion; the applicability of the projection integration algorithm is greatly improved; and a firm foundation is established for development of a simulation procedure of an efficient and reliable active power distribution system.
Owner:STATE GRID CORP OF CHINA +3

Method for reinforcing water-rich silt strata by obliquely arranging multiple rows of freezing pipes

The invention discloses a method for reinforcing water-rich silt strata by obliquely arranging multiple rows of freezing pipes. The method comprises the following steps of 1, conducting surveying andsetting out; 2, conducting drilling with casing; 3, obliquely arranging the multiple rows of freezing pipes; and 4, reinforcing the water-rich silt strata. According to the method, before excavation,silt soil layers on the two sides of a groove wall to be subjected to excavation are obliquely frozen and reinforced to form oblique reinforced pile walls, the distance between the upper portions of the reinforced pile walls is wide, and the distance between the lower portions of the reinforced pile walls is narrow; the side wall of the groove wall to be subjected to excavation can be reinforced,the bottom can be effectively frozen and reinforced, so that the enough strength is achieved, engineering accidents such as water gushing are prevented, and the groove wall collapse possibility in theexcavation process of an underground diaphragm wall can be effectively reduced; and the method is suitable for excavation of silt sand inclusion layers and high underground water levels, it is guaranteed that follow-up excavation construction is safely, reliably and smoothly carried out, the practicability is high, and the effect of reducing pollution can also be achieved.
Owner:NO 1 ENG LIMITED OF CR20G

A Method of Error Estimation and Parameter Adaptive Adjustment Suitable for Implicit Projection Algorithm

An error estimation and parameter adaptive adjustment method suitable for the implicit projection algorithm, which makes full use of the numerical stability characteristics of the implicit projection algorithm's numerical stability domain and its algorithm parameter M, which is basically unrelated, and is aimed at active distribution systems with rigid characteristics Stability simulation model, taking into account possible faults and switch operations during the simulation process, respectively, according to the pre-error estimation method and the post-event error estimation method, the calculation error of each projection integration step of the implicit projection algorithm is estimated beforehand and estimated afterwards , and control the simulation error of the projection algorithm through the adaptive change of the algorithm parameters, which has obvious advantages over the implicit projection algorithm with fixed parameters, and is especially suitable for large-scale active power distribution with significant multi-time scale characteristics under large disturbances The fast and accurate solution to the system stability simulation problem greatly improves the applicability of the projection integral algorithm and lays a solid foundation for the development of efficient and reliable active distribution system simulation programs.
Owner:STATE GRID CORP OF CHINA +3

A cement combined semi-finish grinding optimization control system and method

The invention discloses a cement combination semi-finishing grinding optimization control system. The cement combination semi-finishing grinding optimization control system comprises a data acquisition subsystem, a data analyzing subsystem, a DCS control subsystem, and a centralized control subsystem. The data acquisition subsystem is used to acquire parameters of cement production key equipment in DCS and particle size parameters analyzed and processed by a particle size analyzer. The data analyzing subsystem is used to determine whether cement particle size distribution is reasonable according to data acquired by the data acquisition subsystem, and according to the cement particle size distribution condition, the cement production key equipment is selected to be adjusted, so that the cement particle size tends to be normal, and by using the data analyzing subsystem, the adjusting amplitude of the cement production key equipment is provided. The cement key equipment is adjusted by the DCS control subsystem according to a result acquired by the data analyzing subsystem, and therefore objects of reasonable cement particle size distribution and stable quality are achieved. The invention also provides a cement combination semi-finishing grinding optimization control method.
Owner:UNIV OF JINAN +1

A Programmable Dual Fieldbus Conversion Interface and Method

The invention discloses a programmable double fieldbus conversion interface and a method. An NCUC and Profibus-DP fieldbus conversion interface device is supported. Meanwhile, connected serial port communication equipment or internet access communication equipment can be in reliable communication with equipment supporting the NCUC or Profibus-DP fieldbus through the interface conversion device, and heterogeneous network interconnection is achieved. An STM32F103RET6 microcontroller is adopted and is a 32-bit high-performance microcontroller, a specialized Profibus-DP protocol chip is adopted, communication between user data and the Profibus-DP bus is achieved, and the processing speed is higher. The function of connecting the serial port equipment and the internet access equipment into the NCUC fieldbus and the Profibus-DP fieldbus for communication is achieved. The advantages of being high in processing speed, high in flexibility, reliable in communication and the like are achieved, the design complexity of an industrial field NCUC and Profibus-DP slave station can be reduced, the technical threshold of using the NCUC and the Profibus-DP for a user can be lowered, the development cost can be reduced, and product integration and fast product development are promoted.
Owner:WUHAN UNIV OF TECH

Intelligent internet-of-things testing system based on trailer and automatic control mode of intelligent internet-of-things testing system

The invention relates to an intelligent internet-of-things testing system based on a trailer and an automatic control mode of the intelligent internet-of-things testing system based on the trailer, and the system comprises a top-layer visual centralized control system which achieves the field visualization of a pool, the visualization of a test process and the remote control of a test; a test data management system of a management layer which is used for creating test items, issuing tasks and integrating, analyzing and processing test data; a field data acquisition system of an operation layer which receives the test task, then sends a control instruction to a trailer management system and a wave making and absorbing device, and acquires pool environment monitoring information and trailer operation monitoring information in real time; a trailer management system of a control layer which manages the trailer of the field layer, so that the trailer advances, retreats or stops on a track at a set speed, and the operation monitoring information of the trailer is fed back to the field data acquisition system; therefore, the intelligent internet-of-things testing system of the trailer is formed, the automation of the whole process of a pool towing test is greatly facilitated, and the intelligent internet-of-things testing system is particularly suitable for a high-speed towing test.
Owner:CHINA SHIP SCIENTIFIC RESEARCH CENTER (THE 702 INSTITUTE OF CHINA SHIPBUILDING INDUSTRY CORPORATION)

Method for computer-supported development of an overall system consisting of subsystems

The invention relates substantially to a method for computer-supported development of an overall system consisting of subsystems, in which a combination of real products and virtual behaviour models simulated in real-time are used in the phases of the right branch of the V-model, wherein the development steps ''MIL'', ''SIL'' and ''VPIL'' each comprise an environment model, a reusable multiphysicsmodel and a software, and the development step "HIL'' comprises, in addition to the environment model, another remaining physics unit for simulation of the parts of the hardware of a product that areonly virtually present. In this way, the method enables a temporally parallel and spatially divided integration and a corresponding test of components on various levels, i.e. the right-hand branch ofa V-model, which can be performed to a large extent by the system developer. Open-loop and closed-loop control functions or processes for the overall system level can already be developed in this wayfor example, even though all of the subsystems are not yet present. No parallel systems are required, on which new processes are run-in in advance. Safety-critical systems can, for example, be testedentirely in the laboratory, before a test of the real overall system is carried out in the real environment of same. Some of the key components of the development method according to the invention, such as real-time multiphysics models from the simulation and automatic system tests of development step ''HIL'', are advantageously reusable.
Owner:SIEMENS AG
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