WO2014038742A1 - Appareil et procédé pour estimer des charges de tronçons dans un système de distribution d'énergie électrique - Google Patents

Appareil et procédé pour estimer des charges de tronçons dans un système de distribution d'énergie électrique Download PDF

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WO2014038742A1
WO2014038742A1 PCT/KR2012/007561 KR2012007561W WO2014038742A1 WO 2014038742 A1 WO2014038742 A1 WO 2014038742A1 KR 2012007561 W KR2012007561 W KR 2012007561W WO 2014038742 A1 WO2014038742 A1 WO 2014038742A1
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Prior art keywords
load
voltage
calculated
error data
section
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PCT/KR2012/007561
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English (en)
Korean (ko)
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윤상윤
권성철
추철민
송일근
조성수
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한국전력공사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
    • H02J3/0075—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source according to economic or energy efficiency considerations, e.g. economic dispatch
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/20—Information technology specific aspects, e.g. CAD, simulation, modelling, system security

Definitions

  • the present invention relates to a section load estimation apparatus and method for distribution system (APPARATUS AND METHOD FOR ESTIMATING SECTION LOADS IN POWER DISTRIBUTION SYSTEMS), and more specifically, the system by the recovery of power failure section and system reconstruction, bird flow calculation, etc.
  • Distribution system refers to a power system that converts the high voltage supplied from the power transmission system to a low voltage used in the customer to supply to the customer.
  • the section load is measured through the direct measurement 11 for the load.
  • the transmission system measures the measurement (12) of the amount of generation and the outflow and inflow measurement (13) of the pure line with the load removed. Therefore, in the transmission system, when a problem occurs in the direct measurement of the load, it is possible to estimate the section load using the remaining measurement amount (for example, the inflow of power generation, the outflow of the line, etc.).
  • the estimation of distribution system section load has the following importance in terms of system analysis and control.
  • Distribution system planning Network reconfiguration, a typical distribution system planning solution, also minimizes this by calculating load leveling and tidal flow-based losses based on each D / L (distribution line) load. Since the objective function is used, accurate estimation of the section load is a very important factor. In case of system planning with wrong section load, economic loss such as unnecessary line and equipment construction is expected.
  • Control of distribution system In the event of a failure of the distribution system, fault isolation by the protection device, isolation of the fault section by the automatic switchgear, and restoration of the interruption section are performed sequentially. In order to recover the blackout section, information on the load of the blackout section and the loads of nearby lines that can be transferred are determined. Through this, whether and how to recover the blackout section is determined. The establishment of tracks and automated switchgear in the case of non-recoverable cases is considered, so inaccurate estimates of section loads lead to economic losses.
  • the section load is estimated. Estimation of the section load in the distribution system is an essential factor for grasping the current status of the system by restoring the power failure section, reconfiguring the system, and calculating the current in case of system failure.
  • the conventional distribution system section load estimation system collects and processes acquisition data acquired by a plurality of acquisition devices 31 and a plurality of acquisition devices 31 for acquiring site data from a distribution system.
  • Request data collection by transmitting a data scan command to the data processing device 32 and the field data processing device 32, and receiving the acquired data collected by the field data processing device 32 to perform the section load.
  • It comprises a main device 33 for estimating.
  • the main device 33 includes an interval load estimating apparatus 34 for estimating the interval load using the received acquisition data, and a storage database 35 (hereinafter, stored DB) for storing the received acquisition data and the estimated interval load. It is configured to include.
  • FIG. 4 is a flowchart illustrating a section load estimation method using a conventional distribution system section load estimation system.
  • the distribution system section load estimation system classifies an inflow / outflow measurement apparatus (S10).
  • the distribution system section load estimation system distinguishes the inflow / outflow measurement device of a specific section by searching a topology path from the power supply side (DL lead end) to the load side on the premise that the system configuration is radial. .
  • the distribution system section load estimation system calculates the deviation between the inflow and outflow by using the current measurement values of the divided measuring devices (S20). That is, the distribution system section load estimation system calculates the inflow amount using the current measurement values of the measuring devices divided into the inflow measurement device. The distribution system section load estimating system calculates the outflow amount by using the current measurement values of the measuring devices divided into the outflow measuring device. Then, the distribution system section load estimation system calculates the deviation between the inflow and outflow based on the calculated inflow and outflow.
  • the distribution system section load estimating system distributes the calculated inflows and outflows into individual sections to calculate the loads for the individual sections (S30), and stores the calculated loads for the individual sections in the temporary data storage daily (S40). .
  • the distribution system section load estimation system calculates and stores the maximum value during the week and the maximum value on the weekend (S60). That is, the distribution system section load estimating system calculates the maximum value (ie, the maximum value during the week) of individual section loads during the last five days of the week during the specific time every day, and loads the individual section loads on the last four weeks on Saturday and Sunday. Calculate the maximum of the calculated value (ie, weekend maximum).
  • the distribution system section load estimation system stores the calculated weekly maximums and weekend maximums, and uses the maximums stored in system restoration and reconstruction and protection coordination.
  • the low accuracy of the section load estimation has a significant impact on the reliability and economics of distribution system operation.
  • the section load is lowered in the accuracy of estimation in the distribution system, resulting in a problem of lowering reliability and economic efficiency. Therefore, a technique for increasing the accuracy of estimating the section load in the distribution system has been developed.
  • Korean Patent Registration No. 10-1132015 name: distribution automation server supporting the failure recovery of the distribution line and method
  • the maximum, minimum and average current is calculated using the measured current of each switch, and each section
  • the technique of calculating the section load by using the difference between the maximum current of the power supply switch and the load switching period is described.
  • the section load amount is calculated by subtracting the drawn current value from the draw current value drawn in each section. It mentions a technique to make.
  • section load is estimated using actual measurements of the distribution system, but a large amount of error data exists in the actual measurement of the distribution system.
  • the section load is estimated using the actual measured value including the error data as it is, so that a large number of errors occur in the deviation between the inflow and outflow. Therefore, when using the conventional section load estimation method, there is an error in the estimation of the individual load, so a method of detecting and replacing error data in the actual measurement is required.
  • the conventional section load estimation method stores only the maximum values of the weekdays and weekends of each section, and thus does not take into account the variation in inequality for each section. Therefore, in the conventional section load estimation method, the excessive load is calculated, and there is a problem that a large number of errors occur during system restoration, reconfiguration, and protection coordination.
  • the conventional section load estimation method does not use voltage and phase data for estimating section load, but uses only current data as a measured value. That is, since the inflow and outflow are determined according to the flow direction of the current by the voltage and its phase, it is necessary to estimate the interval load in the unit of reactive power (P / Q) considering the voltage and phase in order to determine the flow by the distributed power supply.
  • the conventional section load estimation method since only the current data is used as a measurement value, there is a problem that an error occurs in the section load calculation by the output of the distributed power source.
  • the present invention has been proposed to solve the above-described problems, and an object of the present invention is to provide an apparatus and method for estimating a section load of a distribution system which detects and replaces error data in actual measurements of the distribution system to estimate the section load. do.
  • Another object of the present invention is to provide an apparatus and method for estimating a section load of a distribution system, which estimates a section load in consideration of variation in inequality rate of individual sections of a distribution system.
  • Another object of the present invention is to provide an apparatus and method for estimating a section load of a distribution system, which estimates the section load using current data, voltage data, and phase data of the distribution system.
  • Another object of the present invention is to provide an apparatus and method for estimating a section load of a distribution system, which estimates the section load by reflecting a loss due to impedance in a section of a distribution system.
  • an error data processing unit for processing the error data of the acquired data received from the field data processing device to calculate the individual section load;
  • a voltage estimating unit estimating a voltage based on the individual section loads calculated by the error data processing unit;
  • a section load calculator configured to calculate the individual section loads based on the individual section loads calculated by the error data processor and the voltage estimated by the voltage estimator;
  • a tidal current calculation unit that calculates a voltage and a phase based on the individual section loads calculated by the section load calculation unit, and calculates tidal current information of each line based on the calculated voltage and phase;
  • a load pattern generator for generating a load pattern based on the algae information calculated by the algal calculation processor.
  • the error data processing unit configures the switch group by using the DL drawing breaker and the switch processing results during initial driving.
  • the error data processing unit configures the switch group by using the measurement quality when it is not the initial driving, but selects the switch units whose measurement quality is set to be reliable by the user or the error data processing unit, and selects voltage quality and current quality among the selected switch units. And the switch groups using the switch devices whose phase quality is all set to be reliable by the user or the error data processing unit.
  • the error data processing unit processes the error data by performing a phase consistency check and a current consistency check for each configured switch group.
  • the error data processing unit calculates the total load for each switch group by using the deviations of the inflow and outflow amounts of each of the configured switch groups, calculates the total load for the switch groups by using the nominal voltage, and individually calculates the total load for the switch groups. Individual section loads are calculated by distributing to section loads.
  • the voltage estimator configures a gain matrix by performing preprocessing on the individual section loads and the voltage and transformer taps calculated by the error data processor, and calculates and observes the standard deviation based on the individual section loads and the quality calculated by the error data processor.
  • a gender test is performed, a covariance is calculated by constructing the gain matrix and the inverse of the gain matrix, and voltage estimation is performed using the calculated covariance.
  • the section load calculation unit configures an automatic switch group based on the measurement quality and the section loss, calculates the section loss based on the inflow current, the outgoing current and the line impedance of the group, and calculates the section on the basis of the calculated section loss.
  • the total load of the group is calculated and the individual loads are calculated by allocating the total load to the individual loads.
  • the section load calculation unit configures the switch group by using the measurement values of the DL drawer breaker and the DG switch during initial driving, and when the initial driving is not the initial driving, the section load calculation unit configures the switch group only by the switch set to be reliable by the error data processing unit. .
  • the tidal current calculation unit calculates the difference value between the reference value and the calculated power inflow value of each line, and calculates the voltage magnitude and the voltage The amount of change is calculated and based on the calculated voltage magnitude and voltage phase, information on tidal current including line flow and loss amount of each line is calculated.
  • the load pattern generator generates weekday and weekend load patterns using the track tide and the loss amount calculated by the tide calculator.
  • the section load estimation method of the distribution system by the error data processing unit to process the error data of the acquired data received from the field data processing apparatus to calculate the individual section load step; Estimating a voltage based on the calculated individual section load by the voltage estimating unit; Calculating, by the section load calculator, the individual section loads based on the calculated individual section loads and the estimated voltages; Calculating, by the tidal current calculation unit, a voltage and a phase based on the individual section loads and the individual section loads calculated based on the estimated voltage, and calculating tidal current information of each line based on the calculated voltage and phase; And generating, by the load pattern generation unit, a load pattern based on the algae information calculated by the algal calculation processing unit.
  • the step of calculating the individual section load by processing the error data includes generating, by the error data processing unit, a switch group based on a current driving state of the distribution system.
  • a switch group is formed using the DL drawout breaker and the switch processing result.
  • the step of calculating the individual section load by processing the error data includes the step of configuring the switchgear group by using the measurement quality when the error data processing unit is not the initial driving, and the step of configuring the switchgear group includes the error data Selecting, by the processing unit, switchgears having the measurement quality set to be reliable by the user or the error data processing unit; And configuring, by the error data processing unit, switch groups using the switch units in which the voltage quality, the current quality and the phase quality among the selected switches are all set to be reliable by the user or the error data processing unit.
  • the step of calculating the individual section load by processing the error data includes processing the error data by performing a phase consistency check and a current consistency check for each configured switch group by the error data processor.
  • the step of calculating the individual section load by processing the error data may include calculating, by the error data processing unit, the total load for each switch group by using deviations of the inflow and outflow amounts of the configured switch groups; And calculating, by the error data processing unit, the calculated total load for each switchgear group to the individual section loads, and calculating the individual section loads. Calculate the total load.
  • the estimating of the voltage may include: configuring, by the voltage estimating unit, a gain matrix by performing preprocessing on the calculated individual section load, the voltage, and the transformer tap; Performing a observability check by calculating, by the voltage estimating unit, a standard deviation based on the calculated individual section load and quality; Calculating a covariance by generating the configured gain matrix and the inverse of the gain matrix by the voltage estimating unit; And performing, by the voltage estimating unit, voltage estimation using the calculated covariance.
  • the step of calculating the individual section load based on the calculated individual section load and the estimated voltage includes: configuring, by the section load calculating unit, an automatic switch group based on the measured quality and the section loss; Calculating, by the section load calculation unit, a section loss based on the inflow current, the outflow current, and the line impedance of the configured auto switch group; Calculating, by the section load calculator, the total load of the group of automatic switchgears based on the calculated section loss; And distributing the calculated total load to the individual loads by the section load calculation unit to calculate the individual section loads.
  • the calculating of the individual section loads based on the calculated individual section loads and the estimated voltage includes: configuring, by the section load calculation unit, a switch group by using the measured values of the DL drawing breaker and the DG switch during initial driving; And configuring, by the section load calculation unit, the switch group only with the switch set in which the measurement quality is reliable by the error data processing unit when it is not the initial driving.
  • the load pattern generation unit In the step of generating the load pattern, the load pattern generation unit generates the weekend and weekend load patterns using the calculated line current and loss amount.
  • the apparatus and method for estimating the interval load of a distribution system can overcome the absence of an error data processing scheme of the distribution system of the existing system, thereby enabling more accurate load identification and data generation.
  • section load estimation device and method of the distribution system can overcome the absence of the load pattern of the existing system to realize the system recovery, system reconfiguration and protection coordination correction through the supply of realistic load data considering the inequality rate There is.
  • the section load estimating apparatus and method of the distribution system will be able to calculate the load of the effective power unit considering the voltage, current and phase, and the load estimation considering the effect of the output of the distributed power supply. Accordingly, the apparatus and method for estimating the interval load of the distribution system can solve the problem that the load calculation using only the current data of the existing system does not reflect the distributed power output.
  • the apparatus and method for estimating the interval load of the distribution system can overcome the absence of the loss consideration of the existing system, and thus it is possible to calculate realistic load data considering the interval loss.
  • the section load estimating apparatus and method of the distribution system can more accurately calculate the line margin in the event of a system failure through more accurate section load calculation, thereby reducing the number of new lines and new equipment for system recovery.
  • the section load estimating apparatus and method of the distribution system can secure the economic feasibility of new line construction and equipment construction at the time of system planning or system reconstruction through more accurate section load estimation.
  • the device and method for estimating the section load of the distribution system can secure economic feasibility for new protection equipment by realizing protection coordination through more accurate section load calculation.
  • 1 to 4 are diagrams for explaining a conventional section load estimation technique.
  • FIG. 5 is a view for explaining a section load estimation apparatus of the power distribution system according to an embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating a method for estimating the interval load of a distribution system according to an embodiment of the present invention.
  • 11 and 12 are flowcharts for describing the voltage estimation step of FIG. 6.
  • FIG. 13 and 14 are flowcharts for explaining the section load calculation step of FIG. 6.
  • 15 and 16 are flowcharts for explaining the tidal current information calculating step of FIG.
  • FIG. 17 is a flowchart for explaining a load pattern generation step of FIG. 6;
  • 18 and 19 are diagrams showing the results of testing by applying a random 10% change in the voltage, current and phase measurements of all automated switchgear.
  • 20 and 21 are diagrams showing the results of testing by applying a random 20% change in the voltage, current and phase measurements of all automatic switchgear.
  • FIG. 5 is a block diagram illustrating an apparatus for estimating the interval load of a power distribution system according to an embodiment of the present invention.
  • the section load estimating system 100 of the distribution system includes a section load estimating apparatus 200 and a storage database 300 of the distribution system, and the section load estimating apparatus 200 of the distribution system is
  • the error data processor 210, the voltage estimator 230, the section load calculator 250, the tidal current calculator 270, and the load pattern generator 290 are configured.
  • the error data processing unit 210 performs error data processing on the acquired data received from the field data processing apparatus 32.
  • the error data processing unit 210 generates a switch group according to a current driving state (that is, whether the error data processing is initially driven). To this end, the error data processing unit 210 processes the information related to the switch connected to the distributed power source (DG) in the distribution system. That is, the error data processing unit 210 searches for a switch and a line connected to the distributed power (hereinafter, referred to as a 'DG switch') when the distributed power is present in the distribution system.
  • the error data processor 210 detects whether a line is pressurized by using a node and open / close state information of the switch. This is to prevent the section load calculation for the non-pressurized lines from among the lines of the distribution system.
  • the error data processing unit 210 configures the switch group by using the processing result of the information related to the DL drawer breaker and the switch at the time of initial driving. That is, the error data processor 210 configures a switch group by using only the DL drawer and the previously detected DG switch.
  • the error data processor 210 selects a switch to participate in the configuration of the switch group by using the measurement quality when the initial driving is not performed. That is, the error data processing unit 210 selects the switch whose measurement quality is set to be reliable by the user or the error data processing unit 210 (that is, the switch whose measurement quality is "Good”, “Manual”, or “MGood”). do.
  • the measurement quality used in the embodiment of the present invention is as described in Table 1 below.
  • the error data processor 210 detects the participating target switch based on the voltage quality, current quality and phase quality of the selected switch. At this time, the error data processor 210 detects a switch whose voltage quality, current quality and phase quality are set to be reliable by the modu user or the error data processor 210 among the selected switches as the participating target switch. The error data processor 210 configures a switch group by using the detected participation target switches.
  • the error data processor 210 performs a phase consistency check and a current consistency check for each switch group. That is, the error data processor 210 performs a phase consistency check based on the alga calculation result calculated in the previous execution. At this time, the error data processing unit 210 determines that the phase upper limit (1 to 4 upper limit) of the switch included in the switch group is different based on the tidal calculation result calculated in the previous execution, and determines the measurement quality of the phase as "Bad". Change to The error data processor 210 compares the inflow and outflow amounts of each switch group to perform a current consistency check for the switch group.
  • the error data processing unit 210 changes the current measurement quality of all the switchgear of the corresponding switch group to "Bad" when the inflow amount is less than the outflow amount. At this time, if any of the consistency check results for each switch group is detected as a violation of the consistency check, the error data processing unit 210 repeatedly performs the selection or consistency check of the switch to participate in the switch group configuration described above.
  • the error data processing unit 210 calculates the total load of each generated group. That is, when the switch group configuration using the DL drawer breaker and the DG switch is completed or a consistency check violation does not occur, the error data processing unit 210 calculates the total load amount of each switch group. At this time, the error data processing unit 210 uses a deviation between the inflow and outflow amounts of the switch group, and in the case of voltage measurement, it is assumed that "Bad data" exists in almost all measurement values, and the switch is operated using a nominal voltage. Calculate the total load for each group. At this time, the error data processing unit 210 calculates the total load of each switch group through the following equation (1).
  • SWGPi is the active power of the i-th automatic switchgear section
  • SWGQi is the reactive power of the i-th automated switchgear section
  • aj is the inflow and outflow direction of the j-th automatic switchgear of the i-th section. In this case, aj is positive for inflow and aj is negative for outflow.
  • Ij is the current of the j-th automated switch
  • ⁇ j is the voltage / current phase difference of the j-th automated switch.
  • the error data processor 210 calculates the load of the individual sections by using the generated auto switch group and the total load of each group calculated. That is, the error data processing unit 210 distributes individual section loads by using the calculated total load for each switch group. At this time, the error data processing unit 210 distributes the individual section load through the following equation (2).
  • LDPij is the active power of the i-th automatic switchgear section
  • LDQij is the reactive power of the i-th automated switchgear section
  • Ni is the number of individual loads in the section.
  • the voltage estimator 230 performs voltage estimation using the initial load data and other measurements calculated by the error data processor 210. That is, the voltage estimator 230 performs preprocessing on the initial load data and other measured values calculated by the error data processor 210. In this case, the voltage estimator 230 performs preprocessing on the load of the individual section, which is the initial load data calculated by the error data processor 210, and the voltage and the transformer tap, which are other measurement values.
  • the voltage estimator 230 performs a zero impedance line (ZBR) process based on the line impedance and the tie switch. That is, the voltage estimator 230 processes the link switch between the lines having a very small line impedance and the substation as a zero impedance line in order to minimize the occurrence of an error in the inverse matrix operation.
  • ZBR zero impedance line
  • the voltage estimator 230 constructs a gain matrix using preprocessed initial load data and other measurements. That is, the voltage estimator 230 calculates a standard deviation using the individual section load calculated by the error data processor 210 and its quality, and performs an observability test. In this case, the voltage estimator 230 applies the order of Equation 4 below to use the weight used for calculating the standard deviation according to the quality of the individual section load.
  • W manual is the weight for the user input
  • W Mgood is the weight for the value entered by the user as “Good”
  • W Good is for the value calculated as “Good.”
  • W Sgood is the weight for the value treated as "Suspected Good.”
  • the voltage estimator 230 selects a reference bus and forms a gain matrix. Thereafter, the voltage estimator 230 changes the structure by extending the preformed gain matrix into a full matrix. The voltage estimator 230 calculates a value of the gain matrix through the voltage and phase partial derivatives of each measurement, and generates an inverse of the gain matrix.
  • the voltage estimator 230 calculates covariance using the gain matrix. That is, the voltage estimator 230 calculates a covariance value using the calculated gain matrix value and the inverse matrix.
  • the voltage estimator 230 estimates a voltage that is a state variable by using the calculated covariance. That is, the voltage estimator 230 updates the state variable by calculating the change amount of the state variable (voltage) using the covariance value. At this time, the voltage estimating unit 230 updates the voltage value by calculating a change amount of the voltage, which is a state variable, using the calculated covariance value.
  • the voltage estimator 230 performs voltage estimation using Equation 4 below.
  • V i + 1 is a calculated voltage at time t + 1
  • V i is a calculated voltage at time t.
  • G is a gain matrix
  • H is a Hessian matrix
  • T is a transpose of the matrix
  • W is a weight matrix.
  • the voltage estimator 230 adjusts the transformer tap by using the updated voltage value. At this time, the voltage estimator 230 performs transformer tap adjustment by using Equation 5 below.
  • TapIni is a tap position of the transformer before estimation
  • TapEst is a tap position of the transformer after estimation
  • VIni is the corresponding transformer secondary voltage before estimation
  • VEst is the corresponding transformer secondary voltage after estimation
  • TapStep is the gap between the taps of the transformer.
  • the unit of the interval between the voltage and the tap (Tap) is a PU
  • the calculation result is represented by an integer (Interger) by cutting off the decimal point.
  • the voltage estimator 230 ends the voltage estimation. If the estimated voltage does not satisfy the convergence condition, the voltage estimator 230 re-performs the voltage estimation using the above-described gain matrix configuration or covariance.
  • the section load calculator 250 calculates the section load based on the processing results of the error data processor 210 and the voltage estimator 230. To this end, the section load calculator 250 performs the processing of the measurement quality QC processed by the error data processor 210. That is, the section load calculation unit 250 processes the DG switch information and determines whether the track is pressurized.
  • the section load calculator 250 configures an automatic switch group using the measurement quality and the section loss.
  • the section load calculation unit 250 configures the switchgear group using only the measured values of the DL withdrawal breaker and the DG switchgear.
  • the section load calculator 250 selects a switch to participate in the switch group group by using the measured quality when the driving condition is not the initial driving situation. That is, the section load calculator 250 selects a switch to participate in the switch group group using the measurement quality processed by the error data processor 210.
  • the section load calculation unit 250 configures the switch group by using only the switch (that is, the switch whose measurement quality is “Good”) in which all the measurement quality is set to be reliable by the error data processing unit 210. That is, the section load calculator 250 configures a switch group by using only the switch whose voltage quality, current quality, and phase quality are all set by the error data processor 210 to be reliable.
  • the section load calculator 250 calculates a section loss. To this end, the section load calculator 250 updates the estimated voltage estimated by the voltage estimator 230 with the voltage of the switch.
  • the interval load calculation unit 250 updates the switch measurement voltage by replacing the estimated voltage estimated by the voltage estimator 230 with the nominal voltage when the error data is processed.
  • the section load calculator 250 calculates a switch group loss (that is, a section loss). That is, the section load calculator 250 calculates section loss using the inflow current and the outflow current and the line impedance of the switch section.
  • the section load calculator 250 calculates the total load of each group. That is, the section load calculation unit 250 calculates the switch group total load using the calculated switch section loss.
  • the section load calculator 250 calculates individual section loads. That is, the section load calculation unit 250 calculates the individual section load by distributing the calculated switch group total load to the individual loads.
  • the algal calculation processing unit 270 calculates algal information of each track.
  • the algal calculation processing unit 270 constitutes the Y matrix of the tracks.
  • the tidal current calculation unit 270 performs a zero impedance line (ZBR) process based on the line impedance and the associated switch.
  • ZBR zero impedance line
  • the tidal current calculation unit 270 processes the link switch between the lines having a very small line impedance and the substation as a zero impedance line in order to minimize the occurrence of errors in the inverse matrix calculation.
  • the algal calculation processing unit 270 selects a reference bus bar.
  • the tidal current calculation processing unit 270 selects a generator bus having the largest active power output as a reference bus.
  • the tidal current calculation processing unit 270 configures the Y matrix, and sets the active power inflow reference value, the reactive power inflow reference value, and the control amount of each bus to be used for the iterative operation. At this time, the tidal current calculation processing unit 270 sets the control amount of the control equipment, such as a generator, a transformer.
  • the control equipment such as a generator, a transformer.
  • the algal calculation processor 270 generates a Jacobean matrix.
  • the algal calculation processing unit 270 generates the structure of the J11 part of the Jacobean matrix, and reconstructs it into a Full Jacobean matrix.
  • the algal calculation processing unit 270 calculates an inverse of the parasitic Jacobean matrix. To this end, the algal calculation processing unit 270 calculates a difference value between the power input amount reference value and the calculated value. That is, the tidal current calculation processing unit 270 calculates a difference value (ie, mismatch) between the reference value of power inflow and the calculated value in each bus. The algal calculation processor 270 generates Jacobean values using the Full Jacobean matrix, and calculates the Jacobean inverse matrix.
  • the tidal current calculation processor 270 calculates a voltage and a phase in which an error is minimized (ie, entered into a convergence range) based on the individual section loads calculated by the section load calculator 250. That is, the algal calculation processing unit 270 calculates the state variable change amount using the Jacobean value, the Jacobean inverse matrix, and the calculated difference value. At this time, the tidal current calculation unit 270 calculates the amount of change in the voltage magnitude and voltage phase which are state variables.
  • the algae calculating unit 270 calculates algae information of each line by using the calculated voltage and phase. That is, the algal calculation processor 270 updates the state variable by using the calculated state variable change amount, and determines whether the state variable is completely converged. At this time, the tidal current calculation processing unit 270 calculates tidal current information including the line tidal current and loss amount using the renewed state variables (ie, voltage magnitude and voltage phase) when the state variables are completely converged.
  • the algae calculation processing unit 270 repeatedly calculates the inverse of the above-described Jacobean matrix and updates the state variables when it is not in full convergence.
  • the load pattern generator 290 generates a load pattern based on the result of calculating the tidal current information of the tidal current calculation processor 270. That is, the load pattern generation unit 290 generates the weekday and weekend load patterns using the line tide and the loss amount calculated by the tide calculation processor 270. Here, weekday and weekend load patterns are used for grid reconstruction, grid recovery and protection coordination. To this end, the load pattern generator 290 determines the update target load pattern and detects the load pattern at the update target time. That is, the load pattern generator 290 determines the processing time point of the current section load data and determines how many parking weekdays and weekend patterns of the year should be updated. The load pattern generator 290 detects load pattern data (weekday / weekend load pattern data of the week during the year) from the storage database 300 at the present time.
  • the load pattern generator 290 calculates a load pattern by using the existing load pattern and the current value, and updates the previously stored load pattern with the calculated load pattern. That is, the load pattern generator 290 calculates the weighted average of the previous value and the current value by the ratio specified by the user for the load pattern data. Through this, the load pattern generator 290 calculates a load pattern. The load pattern generator 290 updates the data of the storage database 300 at that time with the calculated load pattern data.
  • FIG. 6 is a flowchart illustrating a section load estimation method of a distribution system according to an embodiment of the present invention.
  • 7 and 10 are flowcharts for describing the error data processing step of FIG. 6, and
  • FIGS. 11 and 12 are flowcharts for explaining the voltage estimation step of FIG. 6.
  • 13 and 14 are flowcharts for describing the section load calculation step of FIG. 6, and
  • FIGS. 15 and 16 are flowcharts for explaining the tidal flow information calculation step of FIG. 6.
  • FIG. 17 is a flowchart for describing a load pattern generation step of FIG. 6.
  • the error data processing unit 210 performs error data processing on the acquired data received from the field data processing apparatus 32 (S100). That is, as shown in FIG. 7, the error data processor 210 determines the current driving state (S111). At this time, the error data processing unit 210 determines whether the initial run state of the error data processing (initial run). At this time, if the initial drive state (S111; Yes), the error data processing unit 210 forms an initial automated switch group, and calculates the total load of each group (S113). If not in the initial driving state (S111; No), the error data processing unit 210 performs a consistency check (consistency check) for the current and phase (S115).
  • a consistency check consistency check
  • the error data processing unit 210 generates an automated crock group and calculates a total load of each group (S117).
  • the error data processing unit 210 calculates the load of the individual sections by using the generated automatic switch group and the total load of each group calculated (S119).
  • the error data processing unit 210 processes information related to a switch (hereinafter, referred to as a 'DG switch') connected to distributed power in the distribution system (S120). That is, the error data processing unit 210 searches for a switch and a line connected to the distributed power supply when there is a distributed power supply in the distribution system.
  • a 'DG switch' a switch connected to distributed power in the distribution system
  • the error data processor 210 detects whether a line is pressurized by using a node and switch open / close state information (S125). This is to prevent the section load calculation for the non-pressurized lines from among the lines of the distribution system.
  • the error data processing unit 210 configures a switch group by using a result of processing information related to the DL draw breaker and the switch (S135). That is, the error data processor 210 configures a switch group by using only the DL drawer breaker and the DG switch detected in step S120.
  • the error data processing unit 210 selects the switch to participate in the configuration of the switch group using the measurement quality (S140). That is, the error data processing unit 210 selects the switch whose measurement quality is set to be reliable by the user or the error data processing unit 210.
  • the error data processor 210 detects the participating target switch based on the voltage quality, current quality and phase quality of the selected switch. At this time, the error data processing unit 210 detects the switch which is set to be reliable by the user or the error data processing unit all of the voltage quality, current quality and phase quality among the switch selected in step S140 to the participating target switch. The error data processor 210 configures a switch group by using the detected participation target switches (S150). Here, the steps of configuring the switch group (that is, step S150) will be described in more detail with reference to FIGS. 9 and 10.
  • the error data processing unit 210 extracts the line and the transformer number (S151).
  • the error data processor 210 determines whether the extracted line is processed. At this time, the error data processing unit 210 determines that the processing status indicator (Flag) of the extracted line is "1", the processing state, and "0" determines that it is not processed.
  • the processing status indicator (Flag) of the extracted line is "1", the processing state, and "0" determines that it is not processed.
  • the error data processor 210 allocates the extracted line and the transformer to the n-th line and the n-th switch of the N group (S153). To this end, the error data processing unit 210 increases the group number N, and assigns the extracted line and transformer numbers to the n-th line and switch numbers of the N groups.
  • the error data processing unit 210 extracts a starting node (From Node) and an ending node (To Node) number of the extracted line (S154). That is, the error data processor 210 extracts the number of the start node and the end node, which are electrical nodes of the extracted line.
  • the error data processing unit 210 adds the extracted start node and the end node to the node list Node_List (S156).
  • the error data processing unit 210 changes the state of the extracted start node and end node to the processing state (S157). That is, the error data processing unit 210 changes the processing status indicator Flag of the extracted start node and end node to "1".
  • the error data processor 210 increments the leading indicators g_number_snodes of the extracted start node and end node by 1 (S158).
  • the error data processing unit 210 stores the retrieved automation switch and the line number in the final breaker group Group_Last_CB and the last branch group Group_Last_BR of the switch list SW_List. (S160). Thereafter, the error data processing unit 210 performs the operation again from the above-described step S151.
  • the error data processor 210 increments the trailing indicator (g_number_pnodes) by one (S161).
  • the error data processing unit 210 extracts a node corresponding to the position of the trailing indicator from the node list (S162), and extracts a switch list connected to the extracted node (S163).
  • the error data processor 210 adds the automated switch included in the extracted switch list to the switch group list Group_SW_List (S164).
  • the error data processing unit 210 changes the state of the switch which is in the unprocessed state and the unopened state among the switches included in the extracted switch list to the processed state (S165), adds the opposite node to the node list (Node_List), and then precedes the indicator. Increase (S166).
  • the error data processing unit 210 extracts the line list connected to the extracted node (S168).
  • the error data processing unit 210 changes the unprocessed line to the processing state (S169), adds the opposite node to the node list, and increases the leading indicator (S170).
  • the error data processing unit 210 ends the configuration of the switch group. At this time, the error data processing unit 210 performs the process again from the above-described step S151 when the process for the line and the transformer is not completed.
  • the error data processor 210 performs a phase consistency check and a current consistency check for each switch group (S170). That is, the error data processor 210 performs a phase consistency check based on the alga calculation result calculated in the previous execution. At this time, the error data processing unit 210 determines that the phase upper limit (1 to 4 upper limit) of the switch included in the switch group is different based on the tidal calculation result calculated in the previous execution, and determines the measurement quality of the phase as "Bad". Change to The error data processor 210 compares the inflow and outflow amounts of each switch group to perform a current consistency check for the switch group. At this time, the error data processing unit 210 changes the current measurement quality of all the switchgear of the corresponding switch group to "Bad" when the inflow amount is less than the outflow amount.
  • the error data processing unit 210 repeats the above steps S140 to S170.
  • the error data processing unit 210 calculates the total load amount for each switch group (S180). At this time, the error data processing unit 210 uses a deviation between the inflow and outflow amounts of the switch group, and in the case of voltage measurement, it is assumed that "Bad data" exists in almost all measurement values, and the switch is operated using a nominal voltage. Calculate the total load for each group.
  • the error data processor 210 distributes individual section loads by using the calculated total load for each switch group (S185).
  • the voltage estimator 230 performs voltage estimation using the initial load data and other measurements calculated by the error data processor 210 (S200). That is, as shown in FIG. 11, the voltage estimator 230 is configured to calculate initial load data (ie, loads of individual sections) and other measurements (ie, voltage and transformer taps) calculated by the error data processor 210. The pretreatment is performed (S211). The voltage estimator 230 constructs a gain matrix using the preprocessed initial load data and other measurements (S213), and the voltage estimator 230 calculates covariance using the gain matrix. (S215). The voltage estimator 230 estimates a voltage that is a state variable using the calculated covariance (S217).
  • the voltage estimator 230 ends the voltage estimation, and if the convergence condition is not satisfied, the above-described steps S213 to S217 are repeated to perform the voltage estimation again.
  • the voltage estimator 230 performs a zero impedance line (ZBR) process based on a line impedance and a tie switch (S220). That is, the voltage estimator 230 processes the link switch between the lines having a very small line impedance and the substation as a zero impedance line in order to minimize the occurrence of an error in the inverse matrix operation.
  • ZBR zero impedance line
  • S220 tie switch
  • the voltage estimator 230 calculates a standard deviation using the individual section load calculated by the error data processor 210 and the quality thereof, and performs an observability test (S225).
  • the voltage estimator 230 selects a reference bus (S230) and forms a gain matrix (S235). Thereafter, the voltage estimator 230 changes the structure by extending the preformed gain matrix into a full matrix (S240). The voltage estimator 230 calculates a value of the gain matrix through the voltage and the phase partial derivative of each measurement (S245) and generates an inverse of the gain matrix (S250).
  • the voltage estimator 230 calculates a covariance value using the calculated gain matrix value and the inverse matrix (S255), and calculates a state variable (voltage) change amount using the covariance value (S260). Update (S265). That is, the voltage estimator 230 updates the voltage value by calculating a change amount of the voltage, which is a state variable, by using the calculated covariance value.
  • the voltage estimator 230 adjusts the transformer tap Tap using the updated voltage value (S270).
  • the voltage estimator 230 ends the voltage estimation. If the voltage value does not fall within the convergence range (S275; NO), the voltage estimator 230 repeats the above-described step S245 to step S270 to perform the transformer tap adjustment again.
  • the section load calculator 250 calculates the section load based on the results of the error detection step S100 and the voltage estimating step S200 (S300). That is, as shown in FIG. 13, the section load calculation unit 250 performs the processing of the measurement quality QC processed in the error data processing step S100 (S312) and calculates the section loss (S314). .
  • the section load calculator 250 configures an automatic switch group using the measured quality and the section loss, and calculates the total amount load of each group (S316).
  • the section load calculation unit 250 calculates the individual load by distributing the calculated total load to the individual loads (S318).
  • the interval load calculation step S300 will be described in more detail with reference to the accompanying drawings.
  • the section load calculator 250 processes the DG switch information (S320), and determines whether the line is pressurized (S325).
  • the section load calculation unit 250 configures the switch group by using only the measurement value of the DL draw breaker and the DG switch (S335).
  • the section load calculator 250 selects a switch to participate in the switch group group using the measured quality when the driving condition is not the initial driving condition (S340). That is, the section load calculator 250 selects a switch to participate in the switch group group using the measurement quality processed by the error data processor 210.
  • the section load calculator 250 configures a switch group by using only the switch set to be reliable by the error data processor 210 (S345). That is, the section load calculator 250 configures a switch group by using only the switch whose voltage quality, current quality, and phase quality are all set by the error data processor 210 to be reliable.
  • the section load calculator 250 updates the estimated voltage estimated by the voltage estimator 230 with respect to the voltage of the switch (S350).
  • the interval load calculation unit 250 updates the switch measurement voltage by replacing the estimated voltage estimated by the voltage estimator 230 with the nominal voltage when the error data is processed.
  • the section load calculation unit 250 calculates a switch group loss (S355). That is, the section load calculator 250 calculates section loss using the inflow current and the outflow current and the line impedance of the switch section.
  • the section load calculation unit 250 calculates the switch group total load amount (S360). That is, the section load calculation unit 250 calculates the switch group total load using the calculated switch group loss.
  • the section load calculator 250 calculates individual section loads (S365). That is, the section load calculation unit 250 calculates the individual section load by distributing the calculated switch group total load to the individual loads.
  • the algal calculation processing unit 270 calculates algal information of each track (S400). That is, as shown in Figure 15, the algal calculation processing unit 270 constitutes the Y matrix of the lines (S411), and generates a Jacobean matrix (S413). The algae calculation unit 270 calculates the inverse of the parasitic Jacobean matrix (S415), and the voltage of which the error is minimized (ie, in the convergence range) based on the individual section loads calculated by the section load calculation unit 250. And the phase (S417). The algae calculation processing unit 270 calculates algae information of each line using the calculated voltage and phase (S419).
  • the tidal current calculation unit 270 performs a zero impedance line (ZBR) process based on the line impedance and the associated switch (S420). That is, the tidal current calculation processing unit 270 processes the link switch between the lines having a very small line impedance and the substation as a zero impedance line in order to minimize the occurrence of an error in the inverse matrix operation.
  • ZBR zero impedance line
  • the algal calculation processing unit 270 selects a reference bus bar (S425). At this time, the tidal current calculation processing unit 270 selects a generator bus having the largest active power output as a reference bus.
  • the tidal current calculation processing unit 270 configures the Y matrix (S430), and sets the active power inflow reference value, the reactive power inflow reference value, and the control amount of each bus to be used for the iterative operation (S435). At this time, the tidal current calculation processing unit 270 sets the control amount of the control equipment, such as a generator, a transformer.
  • the algal calculation processing unit 270 generates the structure of the J11 portion of the Jacobean matrix (S440), and reconstructs it into a Full Jacobean matrix form (S445).
  • the tidal current calculation processing unit 270 calculates a difference value between the power input amount reference value and the calculated value (S450). That is, the tidal current calculation processing unit 270 calculates a difference value (ie, mismatch) between the reference value of power inflow and the calculated value in each bus.
  • the algal calculation processor 270 generates Jacobean values using the Full Jacobean matrix (S455) and calculates the Jacobean inverse matrix (S460).
  • the algal calculation processing unit 270 calculates the change amount of the state variable by using the Jacobean value, the Jacobean inverse matrix, and the calculated difference value (910). At this time, the tidal current calculation unit 270 calculates the amount of change in the voltage magnitude and voltage phase which are state variables.
  • the algal calculation processing unit 270 updates the state variable using the calculated state variable change amount (S470) and determines whether the state variable is completely converged (S475). At this time, if it is not a complete convergence (S475; No), the algal calculation processing unit 270 repeats the above-described step S450 to step S470. In the case of complete convergence (S475; Yes), tidal current information including track tide and loss amount is calculated using the updated state variable (S480).
  • the load pattern generator 290 generates a load pattern based on the result of calculating the tidal current information of the tidal current processor 270 (S500). That is, the load pattern generation unit 290 generates the weekday and weekend load patterns using the line tide and the loss amount calculated by the tide calculation processor 270.
  • weekday and weekend load patterns are used for grid reconstruction, grid recovery and protection coordination.
  • the load pattern generator 290 determines an update target load pattern (S520). That is, the load pattern generator 290 determines the processing time point of the current section load data and determines how many parking weekdays and weekend patterns of the year should be updated.
  • the load pattern generator 290 detects a load pattern at an update target time point (S540). That is, the load pattern generator 290 detects load pattern data (weekday / weekend load pattern data of the week during the year) from the storage database 300 at the present time.
  • the load pattern generator 290 calculates a load pattern using the existing load pattern and the current value (S560). That is, the load pattern generator 290 calculates the weighted average of the previous value and the current value by the ratio specified by the user for the load pattern data. Through this, the load pattern generator 290 calculates a load pattern.
  • the load pattern generator 290 updates the previously stored load pattern with the calculated load pattern (S580). That is, the load pattern generation unit 290 updates the data of the storage database 300 at that time with the calculated load pattern data.
  • the estimation capability is verified using actual system data.
  • the data used for verification uses actual data for 65 D / L of KJC jurisdiction.
  • the load is randomly distributed using the measured data of the D / L lead-out end, the switch measurement is calculated through algae calculation, and the test is performed using the true value.
  • Table 2 below describes the system data used in the test and its processing method.
  • the estimated value at switch 252 was derived as shown in Table 4 below.
  • test results using the apparatus and method for estimating the interval load of the distribution system according to the present invention estimate the value close to the true value, and it can be seen that there is no problem in the estimation of the measurement value of the automatic switchgear nearby.
  • the bad phase data were inserted into switch 252 and switch 595 and the estimated trend was observed. As shown in Table 5 below, in case of switch 252, the true value is 182 degrees and the bad data of 92 degrees is input.
  • test results using the apparatus and method for estimating the interval load of the distribution system according to the present invention estimate the value close to the true value, and it can be seen that there is no problem in estimating the measured value of the automatic switchgear nearby.
  • 18 and 19 are diagrams showing the results of testing the random 10% change in the voltage, current and phase measurements of all automatic switchgear.
  • 18 is a diagram illustrating a voltage estimate
  • FIG. 19 is a diagram illustrating a current estimate.
  • 20 and 21 are diagrams showing the results of testing by applying a random 20% change value to the voltage, current and phase measurements of all automatic switchgear.
  • 20 is a diagram illustrating a voltage estimate
  • FIG. 21 is a diagram illustrating a current estimate.
  • the section load estimation apparatus and method of the distribution system according to the present invention is the error data processing problem, which is the biggest vulnerability of the conventional method through detection and replacement of voltage, current and phase errors Overcome As shown in the above figure, we can see the result of following the true value even for the random noise of 20%.
  • the load estimation of the directional reactive power unit can be used directly in the analysis and control of the above-described distribution system, it can be used in power distribution planning, etc. by generating a load pattern. If the proposed system of the present invention is employed in the future, it will contribute to securing the efficiency and economics of the distribution system operation through more accurate grasp of the section load.
  • the apparatus and method for estimating the interval load of the distribution system can overcome the absence of the error data processing method of the distribution system of the existing system, thereby enabling more accurate load identification and data generation.
  • section load estimation device and method of the distribution system can overcome the absence of the load pattern of the existing system to realize the system recovery, system reconfiguration and protection coordination correction through the supply of realistic load data considering the inequality rate There is.
  • the section load estimating apparatus and method of the distribution system will be able to calculate the load of the effective power unit considering the voltage, current and phase, and the load estimation considering the effect of the output of the distributed power supply. Accordingly, the apparatus and method for estimating the interval load of the distribution system can solve the problem that the load calculation using only the current data of the existing system does not reflect the distributed power output.
  • the apparatus and method for estimating the interval load of the distribution system can overcome the absence of the loss consideration of the existing system, and thus it is possible to calculate realistic load data considering the interval loss.
  • the section load estimating apparatus and method of the distribution system can more accurately calculate the line margin in the event of a system failure through more accurate section load calculation, thereby reducing the number of new lines and new equipment for system recovery.
  • the section load estimating apparatus and method of the distribution system can secure the economic feasibility of new line construction and equipment construction at the time of system planning or system reconstruction through more accurate section load estimation.
  • the device and method for estimating the section load of the distribution system can secure economic feasibility for new protection equipment by realizing protection coordination through more accurate section load calculation.

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Abstract

L'invention concerne un appareil et un procédé pour estimer des charges de tronçons dans un système de distribution d'énergie électrique, consistant à détecter et à remplacer des données d'erreur dans une mesure effective, prendre en considération l'écart d'un facteur de diversité d'un tronçon individuel, utiliser des données d'intensité, des données de tension et des données de phase, et refléter la perte occasionnée par l'impédance pour estimer de cette manière les charges de tronçons dans le système de distribution d'énergie électrique. L'appareil pour estimer des charges de tronçons dans un système de distribution d'énergie électrique selon l'invention comprend : une unité de traitement de données d'erreur pour traiter des données d'erreur relatives à des données obtenues dans le but de calculer une charge de tronçon individuel; une unité d'estimation de tension pour estimer une tension à partir de la charge de tronçon individuel calculée; une unité de calcul de charge de tronçon pour calculer une charge de tronçon individuel à partir de la charge de tronçon individuel calculée et de la tension estimée; une unité de calcul de flux d'énergie pour calculer une tension et une phase à partir de la charge de tronçon individuel calculée, et pour calculer des informations concernant le flux d'énergie pour chaque ligne à partir de la tension et de la phase calculées; et une unité de génération de courbe de charge pour générer une courbe de charge à partir des informations concernant le flux d'énergie calculées.
PCT/KR2012/007561 2012-09-06 2012-09-20 Appareil et procédé pour estimer des charges de tronçons dans un système de distribution d'énergie électrique WO2014038742A1 (fr)

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