51 results about "Loop analysis" patented technology

The invention discloses a three-phase load flow calculation method of a weak looped distribution network comprising multi-type distributed power sources. Firstly, the effective three-phase load flow calculation method of a weak looped distribution network is put forward in a distribution sequencing network based on a sequence component calculation method and in combination with characteristics of the weak looped distribution network and a loop analysis of a road. Secondly, detailed formula derivation of iterative computation of distributed generation (DG) of a PQ node type, a PQ (V) node type, an OV node type and a PI node type is conducted and the easy formula is introduced into the load flow calculation method. The three-phase load flow calculation method of the weak looped distribution network comprising the multi-type distributed power sources can effectively process multi-type DG and the weak looped distribution network and is distinct in calculation procedure, simple in programming, and easy to achieve. In addition, the three-phase load flow calculation method of the weak looped distribution network comprising the multi-type distributed power sources retains strong points of rapid calculation and stable convergence of a forward-back substitution method catering to branch circuits. Finally, effectiveness and good convergence of the three-phase load flow calculation method of the weak looped distribution network comprising the multi-type distributed power sources is tested and verified by means of a IEEE (institute of electrical and electronic engineers)-37 generatrix test calculation case, and the three-phase load flow calculation method of the weak looped distribution network comprising the multi-type distributed power sources has good ability of processing the multi-type DG and the looped network.

The invention discloses a three-phase decoupling load flow calculation method of a power distribution network based on a path matrix. The method comprises the following steps: firstly, adopting a symmetrical component method to perform sequence component decoupling on a three-phase unbalanced power distribution network to obtain zero sequence, a power distribution sequence network with positive sequence and negative sequence, and adopting a loop-analysis method based on the path matrix to perform one-phase-sequence component load flow calculation to obtain load flows of the three-sequence networks; and secondly, transforming sequence network load flows in a phase component mode by an inverse transformation principle of the symmetrical component method to obtain three-phase load flows. By using the method, a three-phase unbalanced power distribution network system is decoupled into zero sequence, positive sequence and negative sequence networks, so that large matrix manipulation in the three-phase load flow calculation is avoided, the calculated amount is decreased, and the calculation efficiency is improved. The method has the advantages of clear calculation process, simple programming and fast calculation speed. Finally, a 6-busbar test example verifies the correctness and good convergence; and the method is good in generality and practical applicability.

The invention discloses a three-phase decoupling power flow calculation method for a power distribution network containing multiple transformer branches. According to the characteristics of basically symmetrical three-phase line parameters, unbalanced three-phase load and the tree structure of the power distribution network, the method comprises the following steps: performing sequence component decoupling on the three-phase unbalanced network of the power distribution network by a symmetrical component method; in a power distribution three-sequence network model, transforming the transformer branches into the common branches by a phase transformation technology; and calculating the sequence network power flow of the power distribution system by a path matrix-based loop analysis method and transforming sequence component power flow into phase component power flow by an inverse transformation principle so as to realize three-phase decoupling power flow calculation of the three-phase unbalanced system of the power distribution network containing multiple transformer branches and reduce calculated quantity. The method is clear in calculation process, simple in programming and high in calculation speed. The correctness and high convergence property of the method are verified through 34 bus test calculation examples. The method has high generality and practicability.

The invention discloses a distributed generation power distribution network three-phase load flow calculation method taking a phase sequence mixing method into consideration. The distributed generation power distribution network three-phase load flow calculation method comprises the following steps that firstly, a power distribution network three-phase load model, a network phase sequence parameter model and a distributed power supply access model are built based on the phase sequence mixing method, an effective three-phase unbalance power distribution power network improved load flow calculation method is disclosed in a power distribution sequence network, and a sequence component method is fully utilized to process the advantages that a three-phase unbalance system has access to symmetrical distributed generation (DG) and PV nodes; and then PQ, PQ(V), PV and PI node type DG calculation models are deduced in detail and are induced into the discloses load flow calculation method. The distributed generation power distribution network three-phase load flow calculation method taking the phase sequence mixing method into consideration has the advantages of being clear in calculation process, simple to program, quick in calculation speed and good in convergence. Finally, the effectiveness and generality of the distributed generation power distribution network three-phase load flow calculation method are tested and verified through diffset. The distributed generation power distribution network three-phase load flow calculation method has good convergence and strong capacity of processing DG nodes and generating reactive power boundary cross.

A method and system for performing component fault problem close loop analysis are provided. The system establishes a component failure physics fault tree, converts the failure physics fault tree into a failure locating fault tree, establishes, a component fault dictionary with failure mechanism cause corresponding to failure characteristics and performs fault problem close loop analysis to the component according to the fault tree and the fault dictionary. By the method and system of the present disclosure, it is possible to locate the component fault in the internal physical structure by the failure locating fault tree, to give a clear failure path, to quickly identify the failure mechanism corresponding to the component failure mode by analysis of failure feature vector of the fault dictionary, and to determine the mechanism factors and influencing factors of relevant failure mechanism by the failure physics fault tree. Thus, targeted failure control measures are proposed to achieve fast and accurate locating and diagnosis to the electronic component failure.

The invention discloses a high-resolution phase locked loop. The high-resolution loop phase locked loop comprises an input frequency divider, a phase detector connected with a reference frequency divider, a low pass filter connected with the phase detector, a voltage-controlled oscillator connected with the low pass filter, a multiphase loop frequency divider connected with the voltage-controlled oscillator and a phase frequency detector, and an output frequency divider connected with the voltage-controlled oscillator. The high-resolution phase locked loop provides high-resolution and low-noise clock signals, and the multiphase loop frequency divider provides high-resolution feedback signals for the phase frequency detector. The high-resolution phase locked loop improves the resolution of output signals of a phase locked loop in conditions of reducing loop analysis difficulty and reducing resource consumption.

The invention discloses a loop-analysis method based linear method for calculating a three-phase power distribution network tide. The loop-analysis method based linear method comprises the following steps: obtaining the relation function of node voltages and node injection currents of a power distribution network according to a loop-analysis method; for a single-phase system, according to the relation function, obtaining node injection currents in an impedance anti-load, a constant current load, a constant power load and a mixed mode respectively, and introducing in the relation function for calculation to obtain node voltage values; and for a three-phase system, according to the relation function, obtaining node injection currents in an impedance anti-load, a constant current load and a constant power load, and introducing in the relation function for calculation to obtain node voltage values, wherein the three-phase system comprises a star connection load and a delta connection load. The method disclosed by the invention is high in calculation efficiency, few in occupied resources and high in calculation accuracy.

The invention relates to the field of welding, discloses an acquiring method of influence sensitivity of parameters on welding residual stress and deformation, and establishes a simulation model of the welding process of a welded joint. The method comprises the steps of selecting multiple performance arguments of a parent material, conducting experiments sequentially, and acquiring a parameter of each performance argument; adopting the parameter of each performance argument as a standard, and inputting multiple different parameter values within a set difference range of the argument into the simulation model sequentially; conducting the experiments again to acquire the parameter of a performance argument with the highest sensitivity, adopting the parameter of the performance argument with the highest sensitivity as the standard, and inputting multiple different parameter values within the set difference range of the performance argument with the highest sensitivity into the simulation model sequentially; comparing doublet characteristic curves corresponding to parameter changes of each performance argument, determining the performance argument with the highest sensitivity, and forming a close-loop analysis. The acquiring method of influence sensitivity of parameters on welding residual stress and deformation can establish a simulation database of core welding, improves the reliability of welding simulation, and reduces the cost of the testing experiments.

The invention discloses a method and a system for generating a virtual taxpayer fund loop. The method comprises the following steps: determining a falsely making and receiving taxpayer and corresponding social relation personnel; establishing a bank flow information table comprising the falsely making and receiving taxpayer and the bank flow information of the corresponding social relation personnel; generating a fund flow graph according to the bank flow information table, carrying out fund loop analysis operation on the fund flow graph by using a directed graph depth-first algorithm with a sliding time window, and displaying a virtually opened virtual fund receiving loop obtained by the analysis operation; the system comprises a bank flow information table, a social relation data table,an analysis unit and a display unit. The analysis unit is used for generating a fund flow graph according to the bank flow information table and analyzing a fund loop for the bank flow information inthe bank flow information table; according to the method and the system, the problems of low efficiency and few achievements of manual fund loop query are solved, and the case handling efficiency of related departments is greatly improved.

The invention discloses a main-distribution integrated online real-time closed-loop analysis method based on CIM/SVG, which is characterized by comprising the steps of establishing a main-distributionnetwork integrated model; analyzing the model to determine a loop closing path; and performing power flow calculation before and after loop closing on the loop closing path, and performing safety verification according to the closed-loop power flow calculation result to obtain a conclusion on whether the closed loop is successful or not and an adjustment suggestion. The invention has the advantages that the safety verification of the closed loop is provided through closed-loop analysis, the conclusion on whether the closed loop is successful or not is obtained, corresponding adjustment measures and suggestions are provided for the closed loop which does not pass the safety verification, the judgment information of whether the closed loop condition is met after the adjustment is provided,operation dispatchers are enabled to know the closed-loop operation result more visually and clearly through the closed-loop analysis, and meanwhile, the dispatchers can also be facilitated to realizethe closed-loop operation timely, effectively and quickly.

The invention discloses a drawing archive system with a simulation function, which adopts an object-oriented technology, is used in a windows environment, takes Visual Graph Window as a software development tool, and uses a TBL database to store graphic data and manage drawings. The system has the functions of a drawing tool and a drawing file management tool, and the drawing tool can be used fordrawing a drawing and storing the drawing in a computer in the form of a database file. This is also the basis of drawing management. And the management of the drawings is to classify and archive files of the drawings for a user to look up. The system comprises a drawing tool, a simulation library, a database, a picture library and a drawing management module. According to the system, the problemsof rapid modeling and rapid loop analysis in secondary loop simulation are solved, and rapid establishment of a secondary loop simulation system and rapid and accurate calculation of a system operation time loop measurement result are realized.

The invention relates to a multi-input-multi-output aircraft stability margin root locus equivalent determination method, which is used to solve the technical problem that the existing aircraft stability margin root locus determination method cannot determine different combinations. This method establishes the open-loop transfer function matrix of the multi-loop system, and connects a diagonal matrix with gain and lag phase angle to the open-loop transfer function matrix of the system, and obtains the stability margin analysis using the closed-loop transfer function matrix, thus obtaining The root locus scalar equation of the equivalent multi-loop stability margin analysis; the selection of different values ​​of the diagonal matrix artificially connected in series can analyze the phase margin and amplitude of the overall loop, a certain loop, and various combinations margin.

The invention relates to a project transaction closed-loop analysis method, which comprises the following steps of S100, monitoring the compliance condition of a project from two dimensions of a unitand time based on the project milestone time, and obtaining a special monitoring result; step S200, according to a special monitoring result, positioning a position where the abnormal action occurs, the monitoring result comprising a monitoring white list, a monitoring black list and a monitoring gray list; step S300, importing the monitoring result into an analysis tool, wherein the analysis toolautomatically removes a white list of the special monitoring result; and step S400, using a data visualization tool to visually configure and display the thematic monitoring result without the whitelist based on the user-defined rectification index and the newly-added index value.