51 results about "Loop analysis" patented technology

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.

The invention belongs to the field of area data processing in a power system and particularly relates to an area closed-loop data analysis method on the basis of an analytical hierarchy process and wavelet regression. Mainly, by the analytical hierarchy process and wavelet regression closed-loop data processing method, equipment ledger data, operation data, equipment detection overhaul data and marketing data of an area are comprehensively analyzed, an operating state of equipment of the area is evaluated, an electrical load is estimated and forecast, power consumption of a user is modeled, an electricity stealing behavior is judged, line loss is comprehensively and automatically estimated, an area contractor is subjected to automatic responsibility quantization and division and automatic evaluation on a work completion degree, and the like. The area closed-loop data analysis method has the advantages that accurate data support is provided for anti-electric-larceny judgment, formulation of marketing indexes, development of performance appraisal and the like; a method capable of accurately carrying out evaluation index setting and completion result examination is provided for area management of a power supply enterprise; management quality and efficiency of the area are greatly improved.

Method and system for performing close-loop analysis to electronic component failures are provided. The system establishes an electronic component fault tree of physics of failure (FTPF), converts the FTPF into a failure locating fault tree, establishes an electronic component fault dictionary with the cause of failure mechanism corresponding to failure characteristics, and performs close-loop analysis to the electronic component according to the fault tree and the fault dictionary. According to the disclosure, it is possible to locate the electronic 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 electronic component failure mode by analyzing the failure characteristic vector in the fault dictionary, and to determine the mechanism factors and influencing factors of relevant failure mechanism by the FTPF, thereby achieving fast and accurate locating and diagnosis for the electronic component failure.

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 relates to a method for analyzing turn-to-turn faults of a generator rotor based on a multiloop model, belonging to the technical problem of analysis and research of asymmetric fault problems of alternating current motor windings and relay protection of power system master devices. In the invention, based on a multiloop analysis method of an alternating current motor, a voltage and flux linkage equation is listed according to actual connection conditions of all stator and rotor loops in consideration of various space harmonics of air gap magnetic field caused by rotor faults, unbalance current inside a stator phase winding and the change of a topological structure of an excitation winding circuit; various loop parameters, particularly induction parameters related to an excitation winding generating turn-to-turn short circuit faults are accurately calculated, and a transient state calculation method and a stable state calculation method for the turn-to-turn short circuit faults of the excitation winding are provided. Experimental results prove the correctness and the accuracy of the two calculation methods and provide a quantified basis for designing turn-to-turn short circuit protection.

The invention discloses a method and system for generating a fund circuit of a false taxpayer. The method refers to determining the false taxpayer, the false taxpayer, and the corresponding social relationship personnel; establishing the false taxpayer and the corresponding social relationship The bank flow information table of personnel bank flow information, generates a capital flow graph according to the bank flow information table, and uses the directed graph depth-first algorithm with a sliding time window to perform capital circuit analysis and calculation on the capital flow graph, and the analysis operation The obtained virtual opening and receiving capital circuit is displayed; the system includes a bank flow information table, a social relationship data table, an analysis unit and a display unit; The bank flow information in the flow information table is used to analyze the capital circuit; the method and system solve the problem of low efficiency of manual query of the capital circuit and few results, and greatly improve the case handling efficiency of relevant departments.

The invention relates to a method for state estimation in the electrical field, in particular to a practical method for simple state estimation of a distribution network, comprising the following steps: (1) historical section data matching; (2) distribution network topology tree generation; (3) Switch remote signal identification; (4) Remote measurement completion; (5) Loop closure analysis; (6) Assessment statistics; (7) Daily load forecasting. This application provides a practical method for simple state estimation of a distribution network, so as to identify the remote signal value of the switch / knife switch, complement the switch telemetry value, and estimate the most reliable system operating state.

The invention discloses a three-phase decoupling load flow calculation method for a weakly meshed distribution network based on a sequence component method, comprising the following steps of: (1) carrying out three-phase load flow modeling on the weakly meshed distribution network based on the sequence component method and realizing three-sequence decoupling; and (2) building a three-phase decoupling load flow calculation method for the weakly meshed distribution network based on the step (1), wherein the three-phase decoupling load flow calculation method for the weakly meshed distribution network is a loop analysis method based on roads. Thereof, the algorithm keeps the advantages of a forward-backward sweeping method facing to branches; the convergence of the algorithm is not affected by the loop and the loop has better algorithm. Simultaneously, after adopting the three-sequence decoupling, the node number of the system load flow calculation is reduced; the load flow calculation quantity is reduced; and the calculation efficiency is improved. Finally, the accuracy and better convergence of the method provided by the invention are tested through 6-busbar and 33-busbar tests; the stronger loop processing ability is also tested; and the number of iterations is reduced along with the increased closed loop.

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.