WO2019097672A1 - Dispositif et procédé de surveillance de système de distribution d'énergie, procédé de surveillance de système de distribution d'énergie et programme - Google Patents

Dispositif et procédé de surveillance de système de distribution d'énergie, procédé de surveillance de système de distribution d'énergie et programme Download PDF

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Publication number
WO2019097672A1
WO2019097672A1 PCT/JP2017/041455 JP2017041455W WO2019097672A1 WO 2019097672 A1 WO2019097672 A1 WO 2019097672A1 JP 2017041455 W JP2017041455 W JP 2017041455W WO 2019097672 A1 WO2019097672 A1 WO 2019097672A1
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Prior art keywords
voltage stability
calculation
correction
power system
monitoring
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PCT/JP2017/041455
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English (en)
Japanese (ja)
Inventor
顕エドワード 川喜田
大地 加藤
山崎　潤
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株式会社日立製作所
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Priority to PCT/JP2017/041455 priority Critical patent/WO2019097672A1/fr
Publication of WO2019097672A1 publication Critical patent/WO2019097672A1/fr

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    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • 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

Definitions

  • the present invention relates to a power system monitoring device, a power system monitoring method, and a program.
  • Patent Document 1 As a background art of this technical field which monitors electric power grid
  • power flow calculation based on at least two reference bus bars is performed on the target load bus bar for which it is desired to obtain a voltage steady state in the electric power system.
  • a method of monitoring voltage stability of a power system is disclosed.
  • Patent Document 2 As background art of the field of this art which monitors electric power grid, especially voltage stability.
  • the load margin value at the voltage stability limit point after the assumed accident is calculated by an approximate calculation method based on continuous power flow calculation for the assumed accident case for all the transmission lines or generators in the system.
  • An electric power system wherein the load margin value is used as an index of voltage stability of each assumed accident case, and the voltage reliability of the system is evaluated by continuous power flow calculation for the assumed accident case sorted according to the voltage stability Voltage reliability analysis is described.
  • Non-patent Document 2 Phase detector PMU (Phasor Measurement Unit) that measures the bus voltage phase angle of the power system in almost real time by synchronous measurement using GPS (Global Positioning System) is becoming popular.
  • GPS Global Positioning System
  • Non-patent Document 2 The technology using PMU as shown in Non-Patent Document 2 measures the voltage and current of a bus with PMU installed in a short cycle, and replaces it with a reduced system without using an actual system model. After obtaining the impedance, it is possible to monitor the voltage stability in real time by using the value as an indicator of the voltage stability.
  • JP-A-8-130828 JP 2001-025168, A
  • a power system monitoring apparatus evaluates model-based voltage stability based on low-speed wide-area measurement information from a measuring apparatus that collects wide-area grid information.
  • a measurement-based voltage stability monitoring calculation unit, and a period of the measuring device which derives a voltage stability curve based on the result of the model-based voltage stability monitoring calculation and collects local system information in a short period
  • a voltage stability curve correction calculation unit that executes a correction calculation for correcting the voltage stability curve, and a component of the power system model is corrected by back calculation from the corrected voltage stability curve.
  • a correction parameter calculation unit for calculating a correction parameter, based on the calculated the correction parameter characterized in that it comprises a power system model correction unit that performs a correction calculation of the power system model.
  • the system measurement data D1 in the power system 100 are each data measured by the measuring device 44 or the like, received by the system measurement database DB1 in the power system monitoring apparatus 10 according to the present invention via the communication network 300, and stored. Be done. However, instead of receiving the system measurement data D1 directly from the measuring device 44, the system measurement data may be received by the system measurement database DB1 via the communication network 300 after being aggregated once in the monitoring control device or data server. The data may be received from the system measurement database DB1 from both of the devices 44 via the communication network 300.
  • the systematic measurement data D1 includes a unique number for identifying the data and a time stamp.
  • the display unit 11 is preferably configured as, for example, a display device, but may be configured to use a printer device, an audio output device, or the like instead of the display device or together with the display device.
  • the input unit 12 can be configured to include, for example, at least one of a keyboard switch, a pointing device such as a mouse, a touch panel, a voice instruction device, and the like.
  • the communication unit 13 includes a circuit and a communication protocol for connecting to the communication network 300.
  • the CPU 14 reads and executes a predetermined computer program from the program database DB5.
  • the CPU 14 may be configured as one or more semiconductor chips, or may be configured as a computer device such as a calculation server.
  • the grid installation data base DB2 includes, as grid installation data D2, grid configuration, line impedance (R + jX), ground capacitance (admittance: Y), grid configuration and data necessary for state estimation (such as bad data threshold), power generation Machine data, correction data for the data, and other data necessary for power flow calculation, state estimation, and voltage stability calculation are stored.
  • the measurement value may be obtained from a monitoring control device, a central power supply command station, an EMS (Energy Management Systems), or may be obtained directly from a measuring device of the entire system.
  • the input unit 12 manually inputs and stores. Further, at the time of input, the CPU 14 generates necessary image data and displays it on the display unit 11.
  • the complement function may be used to make it possible to set a large amount of data semi-manually.
  • the model-based voltage stability monitoring calculation unit 31 executes model-based voltage stability monitoring calculation for evaluating model-based voltage stability based on low-speed wide-area measurement information from a measuring device that collects wide-area system information. .
  • the voltage stability curve correction calculation unit 33 derives a voltage stability curve based on the result of the model-based voltage stability monitoring calculation, and matches the cycle of the measuring device that collects local system information in a short cycle. Correction calculation to correct the voltage stability curve.
  • the voltage stability curve correction calculation unit 33 calculates the margin value of the voltage stability by correcting the voltage stability curve so that the current operation point is included in the voltage stability curve of the previous operation point (see FIG. 12). reference).
  • the power system model correction unit 35 executes correction calculation of the power system model based on the calculated correction parameter.
  • the measurement base voltage stability monitor calculation unit 32 measures using active power P, reactive power Q, voltage V, voltage phase angle ⁇ , current I, current phase angle ⁇ , power factor ⁇ ⁇ , etc. using measurement data of PMU.
  • a measurement base voltage stability monitoring calculation is executed by the base voltage stability monitoring calculation program P30 (see FIG. 2), and is output to the voltage stability curve correction calculation unit 33.
  • the voltage stability curve correction calculation unit 33 uses the result of the model base voltage stability monitoring calculation and the result of the measurement base voltage stability monitoring calculation to perform voltage stability according to the voltage stability curve correction calculation program P40 (see FIG. 2).
  • the degree curve correction calculation is executed and output to the calculation result data DB4.
  • the correction parameter calculation unit 34 executes the correction parameter calculation program P50 (see FIG.
  • ⁇ Processing procedure 2> In processing procedure 2 shown in FIG. 4, the calculation result of the state estimation calculation program P10 is not input, and active power P, reactive power Q, voltage V, voltage phase angle ⁇ , current I, current using measurement data of PMU It is a procedure when the phase angle ⁇ , the power factor ⁇ ⁇ ⁇ , etc. are input.
  • the measurement base voltage stability monitoring calculation unit 32 calculates the active power P, reactive power Q, voltage V, voltage phase angle ⁇ , current I, current phase angle ⁇ , power factor ⁇ ⁇ , etc. using measurement data of PMU.
  • the measurement base voltage stability monitoring calculation program P30 to execute the measurement base voltage stability monitoring calculation, and outputs the result to the voltage stability curve correction calculation unit 33.
  • FIG. 8 is a diagram for explaining the difference in period of the signal input to the input unit 11 in the power system monitoring device 10.
  • FIG. 8 shows an input cycle for explaining the difference in the input cycle from different measurement devices of the power system monitoring device 10.
  • the measuring device 44 is a measuring device that measures wide-area system information including a conventional TM, and a measuring device that measures local system information including a PMU having a fast measurement cycle. There is.
  • the measurement data input to the input unit 12 (see FIG. 1), as viewed on the time axis, as shown in FIG. 8, at a certain time t0, broad system information (see thick arrows in FIG. 8) Typical system information (see the thin arrows in FIG. 8) is stored in the input data via the input unit 12, and only local system information is stored in the input data via the input unit 12 at another time t1. It will be. Therefore, although the model base voltage stability monitoring program P20 (see FIG. 2) and the measurement base voltage stability monitoring program P30 (see FIG. 2) can execute calculations at time t0, the measurement base voltage stability monitoring program at time t1. Only P30 performs calculations, and the model-based voltage stability monitoring calculation program P20 can not be calculated because there is no input.
  • the calculation result of the model-based voltage stability monitoring calculation program P20 and the calculation result of the measurement-based voltage stability monitoring calculation result program P30 Although it is assumed that the voltage stability curve correction calculation program P40 is newly executed using only the above, at time tn, processing is added to the calculation result of the previous voltage stability curve correction calculation program P40 or the calculation result
  • the present embodiment may be realized using a method of adding an input to an input.
  • the correction parameter calculation program P50 (see FIG. 2) is executed using one or more of the result of the voltage stability curve correction calculation program P40, the system facility data D2 and the calculation setting data D3 to obtain the calculation result It stores in the calculation result database DB4.
  • the power system model correction program P60 (see FIG. 2) is executed, and the calculation result is stored in the calculation result database DB4. Then, it is determined whether to execute rewriting of part or all of the system facility data D2 and the calculation setting data D3.
  • processing step S111 various calculation results and data stored in the memory during calculation are displayed on the display unit 11 (see FIG. 1), and the processing of this flow is ended. It is preferable that various calculation results and data stored in the memory during calculation be sequentially displayed on the display screen. As a result, the operator can easily grasp the operation status and voltage stability of the power system monitoring device 10. Also, by comparing the voltage stability curve correction calculation result and the threshold separately stored in the calculation setting data, when the case where the voltage stability is low and the voltage collapse is close is calculated, an emergency screen or an alarm is output. May be Thereby, the operator can easily grasp the operation status of the power system monitoring apparatus 10.
  • the estimated calculation result of ⁇ is also stored as measurement data.
  • the method of state estimation calculation can be performed, for example, according to the calculation method described in Non-Patent Document 4 or the like.
  • the present embodiment can be carried out with other state estimation calculation methods of the power system, and the present embodiment includes them.
  • the model base voltage stability monitoring calculation P20 is executed using the current phase angle ⁇ , the power factor ⁇ , the system facility data D2 and the calculation setting data D3, and the result is stored (stored in the calculation result database DB4).
  • the calculation result database DB4 For example, “Venkataramana Ajjarapu, Colin Christy,“ The continuation power flow: a tool for steady state voltage stability analysis ”IEEE Transactions on Power Systems, Vol.7, pp.416. -423, 1992 "and the like.
  • this embodiment can be performed and this embodiment shall include them.
  • processing step S107 the result of voltage stability curve correction calculation program P40 (see FIG. 2) executed and stored in processing step S108 of the previous calculation cycle is read out from calculation result database DB4 (see FIGS. 1 and 2). , Stored in the memory 15.
  • processing step S108 the calculation result of measurement base voltage stability monitoring calculation program P30 (refer to FIG. 2) in processing step S103 and the calculation result of model base voltage stability monitoring calculation program P20 (refer to FIG. 2) in processing step S106 or
  • the voltage stability curve correction calculation program P40 is executed using the result of the voltage stability curve correction calculation program P40 executed and stored in the processing step S108 of the previous calculation cycle stored in the memory 15 (see FIG. 1) in the processing step S107.
  • FIG. 11 is an example of a diagram in which the model base voltage stability monitoring calculation result and the measurement base voltage stability monitoring calculation result of the power system monitoring device 10 are described on the voltage stability curve coordinate
  • FIG. It is an example of the figure which described the degree curve correction calculation result on the voltage stability curve.
  • FIG. 13 is an example of a power system model for explaining the concept of the power system monitoring apparatus 10 and the power system monitoring method.
  • FIG. 13 is a power system model of a one-machine infinite bus used in the following description.
  • voltage Vs from the voltage source is applied to node # 1
  • voltage Vr of node # 2 active power flow P and reactive power flow Q
  • power factor ⁇ via transmission line impedance X and electrostatic capacity Y Is present.
  • the measuring device 44 can measure all the information.
  • a measurement device that measures local system information including PMU is installed at node # 2.
  • equation (8) is derived.
  • the function shown by Formula (8) represents the said voltage stability curve.
  • the voltage stability correction curve can be obtained by drawing the equation (here, equation (8)) that draws the voltage stability curve by adding the obtained ⁇ X, ⁇ Y, and ⁇ , and based on that, the load margin ⁇ P '' Will also be required.
  • the curve shown by the long broken line in FIG. 12 always draws the latest voltage stability correction curve, and the latest load margin And the correction value of the correction parameter candidate can be obtained. That is, the voltage stability correction curve (see the long dashed line in FIG. 12) after the series of processing has been executed is a new voltage stability curve drawn by the model-based voltage stability monitoring calculation program P20 (see FIG. 2). (Refer to FIG. 12 long dashed line) is drawn.
  • the current voltages V'0 and P'0 in FIG. 11 (refer to the arrow starting from the mark ⁇ which is not on the voltage stability curve in FIG.
  • a formula of a voltage stability curve is derived using the results of the system facility data D2, the calculation setting data D3, and the model-based voltage stability monitoring calculation program P20.
  • the formula of the voltage stability curve is directly derived from the system facility data D2 and the calculation setting data D3
  • the formula of the voltage stability curve is derived using, for example, the following (1) to (3) May be (1)
  • a curve fitting algorithm is executed using a plurality of power flow calculation results executed by the model-based voltage stability monitoring calculation program P20, (2) unknown parameters using the system facility data D2 and the calculation setting data D3 in advance
  • the function of the voltage stability curve using is derived, and the parameters are determined or estimated by state estimation using a plurality of power flow calculation results executed by the model-based voltage stability monitoring calculation program P20, (3) polynomial
  • the approximation may be performed and the coefficients may be determined or estimated by state estimation using a plurality of power flow calculation results executed by the model-based voltage stability monitoring calculation program P20.
  • processing step S303 values of correction parameter candidates for minimizing the expression (11) of the objective function while satisfying these expressions (9) and (10) as constraints are determined. Since this is a problem of quadratic programming, it can be solved using various solution algorithms. In the present embodiment, if the algorithm used here is a solution of quadratic programming, it shall be included.
  • the screen 503 is a screen for displaying a system diagram of a power system to be monitored.
  • the system diagram includes multiple branches, nodes, substations, transformers, generators, loads, switches, disconnectors, phase-shifting equipment, and other measuring devices and controllable devices (battery, rechargeable / dischargeable secondary battery , An EV storage battery, a flywheel, etc.) are displayed. Further, it is preferable that the amount of flow of the branch, the phase angle of the bus, and the margin of the voltage stability are also shown using color or gradation display. In addition, it is preferable that detailed information of each component is displayed in a separate frame when each component is selected. In particular, regarding branches and nodes, it is preferable that the voltage stability correction curve of the branches and nodes be displayed on the screen 502.
  • Voltage stability curve correction calculation unit 33 for performing correction calculation, correction parameter calculation unit 34 for calculating a correction parameter for correcting components of the power system model by back calculation from the corrected voltage stability And a power system model correction unit that executes correction calculation of the power system model based on the correction parameter.
  • the voltage stability curve correction calculation unit 33 fixes the value of one axis of the operating point at the previous calculation time and plots the voltage at the current operating point and the point plotted on the voltage stability correction curve at the previous calculation time By determining that the distance on the coordinate that describes the stability curve is below a certain level, it is possible to grasp the deviation from the operating point and the voltage stability correction curve, and it is possible to calculate errors due to disturbances etc. It becomes possible to operate robustly.
  • each of the above configurations, functions and the like may be realized by software for the processor to interpret and execute a program that realizes each function.
  • Information such as programs, tables, and files for realizing each function is a memory, a hard disk, a recording device such as a solid state drive (SSD), or an integrated circuit (IC) card, a secure digital (SD) card, an optical disc It can be held on a recording medium.
  • processing steps that describe time-series processing are parallel or individual processing that is not necessarily performed chronologically, as well as processing performed chronologically in the order described. Processing (eg, parallel processing or processing by an object).
  • control lines and information lines indicate what is considered to be necessary for the description, and not all control lines and information lines in the product are necessarily shown. In practice, almost all configurations may be considered to be mutually connected.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

Cette invention concerne un dispositif de surveillance de système de distribution d'énergie, un procédé de surveillance de système de distribution d'énergie, et un programme permettant de surveiller une stabilité de tension de système de distribution d'énergie avec une vitesse et une précision élevées. Le dispositif de surveillance de système de distribution d'énergie (10) comprend : une unité de calcul de surveillance de stabilité de tension à base de modèle (31) qui effectue un calcul de surveillance de stabilité de tension à base de modèle pour évaluer une stabilité de tension à base de modèle sur la base d'informations de mesure étendues basse vitesse obtenues à partir d'un dispositif de mesure qui collecte des informations de système étendues ; une unité de calcul de surveillance de stabilité de tension à base de mesure (32) qui effectue un calcul de surveillance de stabilité de tension à base de mesure sur la base d'informations de mesure locales grande vitesse obtenues à partir d'un dispositif de mesure qui collecte des informations de système locales avec un cycle court ; une unité de calcul de correction de courbe de stabilité de tension (33) qui effectue, en synchronisation avec le cycle du dispositif de mesure qui collecte des informations de système locales avec le cycle court, un calcul de correction pour corriger une courbe de stabilité de tension ; et une unité de calcul de paramètre de correction (34) qui calcule un paramètre de correction pour corriger un élément constitutif d'un modèle de système de distribution d'énergie par calcul en retour à partir de la courbe de stabilité de tension corrigée.
PCT/JP2017/041455 2017-11-17 2017-11-17 Dispositif et procédé de surveillance de système de distribution d'énergie, procédé de surveillance de système de distribution d'énergie et programme WO2019097672A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111523245A (zh) * 2020-04-30 2020-08-11 广东电网有限责任公司东莞供电局 一种高压配网短路电流计算模型的建立方法、装置及设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001025168A (ja) * 1999-07-09 2001-01-26 Fuji Electric Co Ltd 電力系統の電圧信頼度解析における並列処理方法
JP2015211512A (ja) * 2014-04-25 2015-11-24 株式会社日立製作所 電圧安定度監視装置および方法
JP2016167904A (ja) * 2015-03-09 2016-09-15 株式会社日立製作所 電圧安定度計算装置および電圧安定度計算方法
JP2017112709A (ja) * 2015-12-16 2017-06-22 株式会社日立製作所 電圧安定度監視装置および方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001025168A (ja) * 1999-07-09 2001-01-26 Fuji Electric Co Ltd 電力系統の電圧信頼度解析における並列処理方法
JP2015211512A (ja) * 2014-04-25 2015-11-24 株式会社日立製作所 電圧安定度監視装置および方法
JP2016167904A (ja) * 2015-03-09 2016-09-15 株式会社日立製作所 電圧安定度計算装置および電圧安定度計算方法
JP2017112709A (ja) * 2015-12-16 2017-06-22 株式会社日立製作所 電圧安定度監視装置および方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111523245A (zh) * 2020-04-30 2020-08-11 广东电网有限责任公司东莞供电局 一种高压配网短路电流计算模型的建立方法、装置及设备

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