1884 results about "Line loss" patented technology

The invention relates to a grid line loss monitoring and analyzing system, which utilizes data in an electric power automation system to perform real-time monitoring and analysis on grid line loss. The system comprises a data acquisition server, a database and an application server, wherein the data of the electric power automation system is connected with the data acquisition server through an FTP server and a data access interface; the data acquisition server comprises a data acquisition module and a line loss computation module; the database comprises an EMS data sheet module, a TMR data sheet module, a meteorological data sheet module and a line loss sheet module; and the application server comprises a basic data management module, an actual line loss analysis module, a theoretical line loss analysis module, a line loss comparative analysis module, a line loss statistical report module, a system configuration module, a user management module and a wiring diagram navigation module. By utilizing the conventional electric power automation system effectively, the line loss management level and working efficiency are improved, and a scientific basis is provided for the formulation and implementation of loss reduction measures.

The invention discloses a transmission and distribution network integration comprehensive line loss management analysis system and a processing flow thereof. The processing flow comprises the following steps of: obtaining the required network topology, line parameters, real-time data and history data from an EMS (energy management system), a power distribution GIS (geographic information system), a TMR (tele-meter reading) system and an electricity consumption information acquiring system through a processing interface, finishing integrating of the network topology, the line parameters, the real-time data and the history data based on unified object code and management service through model splitting software; and storing the analysis result into a database through digital monitoring and alarm software, power supply path analysis software, transmission and distribution network integration line loss counting and analysis software, and transmitting the result to the Web server to produce report forms. The system and processing flow disclosed by the invention provide suggestions for performing omnibearing and multi-angle monitoring and analysis on the full network loss, and also provide suggestions for a power grid to carry out the work of operation way optimization, technical reconstruction and the like with reduced grid loss rate.

The invention discloses a voltage converter with line loss compensation, which comprises a control circuit and a line loss compensation module. Input voltage Vin is input into the control circuit; the control circuit performs voltage conversion; after the output circuit of the control circuit passes through a filtering circuit, the control circuit outputs a converted voltage VOUT; after the converted voltage VOUT passes through a conducting wire, the voltage becomes an after wire output voltage Vo; the after wire output voltage Vo is supplied to load; voltage drop is produced between the converted voltage VOUT and the after wire output voltage Vo because of the parasitic resistance Rline of the conducting wire; the line loss compensation module samples the voltage drop produced between the converted voltage VOUT and the after wire output voltage Vo and feeds back the voltage drop to the control circuit, therefore, the after wire output voltage Vo reaches the set value. The voltage converter has the advantages that the line is simple to be realized, when the voltage converter is applied to a vehicle charger, constant voltage/constant current control can be realized, and input and output ports of circuits and external components are not required to be added.

The invention relates to a line loss lean comprehensive management system and a line loss lean comprehensive management method. Relevant line loss data dispersed at automation systems are integrated so as to establish a uniform line loss databank and eliminate line loss information isolated island. The data is read on line so as to calculate the line loss, and the conventional line loss calculation is changed into on-line statistics and calculation from afterwards statistics and calculation, so that the real-time property in line loss analysis is enhanced. The line loss situation of an electric power bureau is calculated in the overall angle, the calculation and analysis on the line loss cover all voltage grades of a power grid, and the comprehensiveness and the completeness in line loss calculation and analysis are ensured. By adopting the on-line calculation mode, the situation that in the past the calculation and analysis can only be carried out on typical days is changed, the line loss analysis does not change along with the change of the season and the external environment any longer, the calculation result is more accurate and real, the situation that in the past only the line loss result is singly and roughly analyzed is changed, the working cost is lowered, and the working efficiency is improved.

The invention relates to a grading anti-stealing system and a method, which are applied in electrical distribution network. The system comprises a plurality of electric charge collecting devices respectively arranged at each negative charge of a power supply circuit and at relevant negative charges on all branch power supply circuits of the negative charge according to the topological structure of an electrical distribution network; a data transmission device for transmitting the realtime electric charge information collected by the plurality of electric charge collection devices; and a monitor center for receiving the realtime electric charge information transmitted by the data transmission device for storage, analyzing the difference between inflow charges and out charges and the line loss at each node in a power network and comparing the line loss with the normal line loss of the node to determine whether an electricity-stealing suspicious node is present.

The invention relates to a comprehensive energy-conservation evaluation and decision-making method for an urban and rural distribution network. In the method, current comprehensive data of a power grid by modeling the power grid; unified analysis processing and seamless exchange docking of distribution network data are realized by adopting reasonable fault tolerance and error correction technology so as to ensure the accuracy of comprehensive data information. An energy-conservation and loss reduction optimization management strategy of the urban and rural distribution network is researched by combining the costs of a line loss evaluation system and each link of loss reduction technology according to optimization technology.

The invention discloses an electricity larceny user identification method in combination with transformer area line loss and abnormal events. The electricity larceny user identification method comprises the steps of: acquiring transformer area and user data of at least one transformer area to be inspected, wherein the transformer area and user data comprises transformer area line loss data and basic data of each electricity utilization user in the transformer area; determining an abnormal line loss transformer area in which electricity larceny suspect users exist in a specified electricity utilization time period by applying a transformer area line loss anomaly detection method and the transformer area line loss data of the at least one transformer area to be inspected; determining a K-means clustering electricity larceny suspect user set, a support vector machine electricity larceny suspect user set and a Bayesian algorithm electricity larceny suspect user set for any abnormal line loss transformer area with the electricity larceny suspect users; and determining an electricity larceny suspect user list in the abnormal line loss transformer area after comprehensive evaluation. According to the electricity larceny user identification method, the identification rate of low-voltage electricity utilization abnormal users is effectively improved, and the workload of electricity utilization inspectors for investigation is effectively reduced.

The invention discloses a system and a method for calculating line loss rate of an electric power distribution line. The system is designed for mainly realizing convenience, rapidness and accuracy of the calculation of the line loss rate of the electric power distribution line. The system comprises a power supply volume acquirer, an electricity sales acquiring device, a terminal acquirer, a low-voltage electricity sales acquirer and a high-voltage electricity sales acquirer, wherein the power supply volume acquirer is arranged on a public line of a power substation and used for acquiring the power supply volume of the electric power distribution line; the electricity sales acquiring device comprises a site management terminal arranged at the high-voltage side or low-voltage side of a special electric power distribution transformer; the terminal acquirer is arranged at a low-voltage user terminal of a public electric power transformer; the low-voltage electricity sales acquiring device is arranged at the low-voltage side of the public electric power transformer; and the high-voltage electricity sales acquirer is arranged on the electric power distribution line of the power substation and connected with the site management system through an optical cable. According to the invention, data of each load terminal is acquired in real time through the electricity sales acquirers without acquiring parameters of the devices in the electric power distribution line in advance, and the line loss rate can be calculated on line.

The invention discloses an outlier detection-based real-time anti-power-theft monitoring method for a power utilization information acquisition system. The method comprises the steps of calculating line loss of each zone area according to acquired power data of each zone area, and preliminarily judging whether a zone area in an abnormal power utilization state exists or not; if the line loss of certain zone areas is abnormal, collecting power utilization data of the corresponding zone areas, wherein the power utilization data includes user real-time power utilization data and abnormal event data; selecting reasonable evaluation indexes and building a comprehensive power theft suspicion analysis model in combination with methods of outlier detection, data statistics and the like; and taking data collected by a main station as an input of the model, processing user data through the analysis model and obtaining a user power theft suspicion coefficient, thereby locating a suspected power theft user. According to the method, the deficiency of only manual analysis of massive data is overcome, and the efficiency of an algorithm and the reference value of a detection result are improved.

The invention discloses a terminal disturbance topological structure identification method of a station area power network based on centralized dispatching, which relates to a power system informationprocessing and automatic identification technology, and belongs to the technical field of power generation, power transformation or distribution. By constructing the network routing topology of intelligent sensing system for low voltage distribution network, identifying the type of acquisition device in the routing topology of the constructed network, the physical topology structure of the tablebox monitoring unit and the physical topology structure of the branch box monitoring unit are constructed from bottom to top by the way of traversing query, the branch box monitoring unit and the meter box monitoring unit without parent node are eliminated, the physical topology of the meter box monitoring unit and the physical topology of the branch box monitoring unit are integrated according tothe mapping between the parent node and the child nodes to obtain the disturbance topology of the terminal of the power network in the station area, The method is favorable to the refinement of management and the practical application of the project, and can provide accurate basic files of transformer-line-customer relationship for the analysis of sectional line loss and line loss in the stationarea.

The invention discloses a system and method for managing line loss of a power grid in real time. The system comprises an automatic data management server, a center database, a real-time line loss management module and a plurality of work stations. The output end of the automatic data management server is connected with the input end of the centre database through a network; the center database and the real-time line loss management module are communicated with each other; and the output end of the real-time line loss management module is connected with each work station through a network. By using an SG186 system data and remote meter reading data as bases, the refined management of the line loss can be realized, the problems existing in the existing line loss management are effectively solved, and various metering faults and illegal power utilization behaviors can be found out in time, so that measures can be adopted in time. Therefore, the purpose of reducing the line loss is achieved.

The invention provides a system for analyzing line loss of a distribution network, which comprises an acquisition module, a pretreatment module, a communication module and a data statistics module, wherein the acquisition module is used for acquiring network basis line loss data; the pretreatment module is used for extracting changed basis line loss data information; the communication module is used for sending the line loss data information according to a certain communication rule; and the data statistics module is used for receiving the line loss data information sent by the communication module and analyzing the network line loss according to the line loss data information. The invention also provides a method for analyzing the line loss of the system for analyzing the line loss of the distribution network.

The invention discloses a multifunctional station line loss management system, and belongs to the field of power generation, power transformation or power distribution. The system comprises an existing transformer area digitalization management system, wherein the transformer area digitalization management system reads power supply and sale quantity information of each outgoing line or each user of a transformer substation to compute line loss; a list of line loss rates of the users in a previous month is exported from the transformer area digitalization management system; a line loss distinguishing data model is established to screen high line loss rate transformer areas; line loss data exception transformer areas are locked; the users in the line loss data exception transformer areas are counted according to power quantity differences of the users during flat and peak load periods; and exceptional power utilization periods are automatically distinguished by comparing the power quantity differences during the flat and peak load periods. The system can increase a distinguishing success rate of transformer area/station line loss factors, can progressively improve an integral line loss control level of transformer areas/stations by virtue of a spiral rising working mode, can gradually reduce an integral line loss rate of a regional power supply network, and can be widely applied to the field of operation analysis and power utilization management of power systems.

A comprehensive evaluation method for the line loss level of a low-voltage transformer area comprises the steps as follows: equivalent resistance of distribution lines in the low-voltage transformer area is calculated respectively; the line loss rate and head end average load current of a low-voltage circuit are measured; a load curve characteristic coefficient and a three-phase unbalanced line loss correction coefficient are calculated respectively; the theoretic line loss rate in the low-voltage transformer area is calculated, and the measured line loss rate and the theoretic line loss rate are compared, so that the management line loss level in the low-voltage transformer area is judged; and the like, wherein the head end average load current, the load curve characteristic coefficient, the three-phase unbalanced line loss correction coefficient and the like are calculated along with a calculation method of the theoretic line loss of the to-be-calculated low-voltage transformer area after a simultaneous equation set is established. According to the method, the parameters and a management line loss evaluation threshold can be accurately calculated, and comprehensive evaluation of the line loss level of the low-voltage transformer area can be accurately completed further; and particularly, when electricity stealing and leakage conditions occur, the method can accurately judge the line loss level, and misjudgments are avoided.

The present invention discloses a low-voltage area KFCM-SVR reasonable line loss prediction method. The method comprises the following steps: 1) presorting data samples twice after data screening; 2) clustering six types of data by using fuzzy kernel clustering to obtain a plurality of small types; 3 ) establishing a regression fitting model by virtue of a least squares support vector machine (LS-SVR); 4 ) calculating a residual error confidence interval limit value; 5) classifying to-be-predicted data into each small types according to a Euclidean distance principle; 6) after classification, inputting the to-be-predicted data into each respective corresponding LS-SVR model, and calculating to obtain a prediction residual error; and 7) comparing the prediction residual error with the residual error confidence interval limit value to provide a conclusion. In the low-voltage area KFCM-SVR reasonable line loss prediction method disclosed by the present invention, an algorithm has certain reasonableness under a big data condition, and a computed result of the algorithm can provide relatively reliable guidance for area line loss management of an electric power department, and provide a new idea for reasonable utilization and mining of big data in the current smart power network.

The invention relates to a method and a device for monitoring and analyzing the line loss of a power grid. The method comprises the following steps of: establishing a power grid model parameter library through a series of analysis methods; acquiring real-time data, gateway meter data and meteorological data such as temperature data, humidity data and the like, storing in a database, and calculating actual line loss and theoretical line loss; calculating the tidal current of the power grid by using a Newton Raphson algorithm, and calculating the power loss of the power grid so as to calculate the theoretical line loss of the power grid; analyzing and comparing the line loss, searching error reasons and making analysis suggestions; and obtaining a result and ensuring the real-time property of the data. By comparing and analyzing a theoretical calculated value and an actual test calculated value of the line loss, an association relationship between the line loss of the power grid and factors such as a grid structure, the tidal current of the power grid, meteorological factors and the like is searched, the error reasons of the line loss are analyzed, the statistical calculation and analysis of the line loss of the power grid are guided, and scientific evidences are provided for making and performing loss reducing measures.

The invention discloses a method and a system for identifying user-transformer relationship in a low-voltage stage area, wherein, the method comprises the following steps: obtaining source data including at least one or more of archival data, voltage data and current data from a user information acquisition system; Carrying out data cleaning on the source data to obtain the cleaned data; Obtainingthe electric address data and the voltage data which can characterize the customer-transformer relationship from the cleaned data, and identifying the station area according to the electric address data and the voltage data to obtain the corresponding identification result; Carrying out data verification on the obtained recognition results; Thus, the identification method provided by the embodiment of the invention can reduce the working difficulty of the field personnel, improve the accuracy of the line loss calculation, provide a reasonable basis for the loss reduction analysis, and effectively solve the problem that has plagued the electric power enterprise for a long time.

The invention discloses a cable with a composite carbon fiber stranded wire reinforced core for a power transmission line and a manufacturing method thereof. The cable consists of a core wire (1) with a load bearing function and at least one layer of metallic conductor (2) with a conductive function, wherein the core wire (1) is wrapped in the metallic conductor (2). The cable is characterized in that: the core wire (1) consists of a plurality of strands of carbon fiber composite cores (3), wherein the carbon fiber composite cores (3) are obliquely twisted and bonded into a whole. The cable provided by the invention has light specific weight, strong strength, resistance to high temperature, corrosion resistance, low line loss, low sag and a low thermal expansion coefficient.

The invention relates to a dynamic loss reduction method for a distribution network and a synthesized loss reduction system of a distribution network. A principle that an electric field and a magnetic field are mutually symbiotic and affected is applied for dynamically realizing electromagnetic balance; the treatment of'peak load shifting'is carried out on the current difference value between three-phase unbalanced currents caused by the dynamic unbalance of the power used by a three-phase load at the secondary side of a distribution transformer so as to lead the current difference value to approach balance, reduce a zero sequence current and the unbalance degree of the three phases, and restrain a harmonic, thereby realizing the self loss (loss on transmission) of the distribution transformer and the line loss (the copper loss of the line) at the first side and the secondary side of the distribution transformer; the synthesized loss reduction system of the distribution network realizes the synthesized loss reduction management of the distribution network, the loss on transmission of the distribution transformer as well as the automatic measuring and accounting on the data of the copper loss of the line at the first side and the secondary side thereof; the system also realizes the remote automatic collection on the power data of the distribution transformer in the same time as well as the accounting of the line loss of a distribution line, calculates and accounts the line loss of the distribution network, calculates and analyzes the loss reduction as well as analyzes the benefits of energy saving and emission reduction.

The invention discloses a reactive power and voltage control method for grid-connected inverters of a large photovoltaic power station. The method comprises steps as follows: a voltage reference unit gives reference voltage uref to a voltage control point; a reactive power setting unit is used for comparing actual voltage of the voltage control point with the reference voltage to obtain voltage deviation, and reactive power reference quantity Qref required by maintaining voltage of the voltage control point is automatically acquired through a PID (proportional-integral-derivative) controller; a reactive power distribution unit automatically performs reactive power distribution between SVG (scalable vector graphics) and each photovoltaic power generation unit; the grid-connected inverters in the photovoltaic power generation units adopts distribution in equal proportion of reactive capacity. According to the method, coordinated control of a reactive power compensation device of the photovoltaic power station and the photovoltaic inverters is sufficiently utilized, grid-connected point voltage fluctuation of the photovoltaic power station is reduced, reactive power support is provided for a power grid, and voltage stability of a weak grid is improved; meanwhile, reactive power is distributed according to line loss of the photovoltaic power generation units, and active loss of the photovoltaic power station is reduced; therefore, the reactive power and voltage control method facilitates safe, economic and stable operation of the large photovoltaic power station accessing the weak grid.

The invention discloses a method for improving time accuracy of an electric energy information acquisition system. In the method, the time delay in four links, namely an astronomical time service module, a background server, a concentrator and metering terminal equipment, is calculated, predicted and compensated so as to improve the time accuracy of the electric energy information acquisition system. By calculating and predicting the time delay issued by time correction in the background server, the concentrator the terminal equipment and other links in the whole network of the electric energy information acquisition system and compensating the time delay, unified and accurate time marks are provided for each level of the electric energy information acquisition system, the data of the whole electric energy information acquisition system has an accurate time stamp, the time accuracy of the electric energy information acquisition system is improved, and the accurate time reference is provided for operation and scheduling, control, statistic analysis of line loss and other functions of a power system.

The invention discloses a distribution network three-phase load unbalance adjusting control system which comprises a monitoring subsystem, an intelligent power distribution terminal and an intelligent phase-change switch. The monitoring subsystem and the intelligent power distribution terminal conduct data transmission through a wireless communication network, and the intelligent power distribution terminal and the intelligent phase-change switch conduct data transmission through the wireless communication network. By means of the distribution network three-phase load unbalance adjusting control system, the current and voltage information of a power distribution transformer in a distribution unit-area, three-phase four-wire branch lines and single-phase load can be acquired in real time, the unbalancedness of the distribution network three-phase current is obtained through calculation, on-line phase modulation is conducted according to the unbalanced load, and partial load of a phase of a large current is transferred to a phase of a small current, so that the purpose that the distribution network three-phase load unbalance is adjusted is achieved, the line loss is effectively lowered, and power supply quality is improved.