CN103678876A - Power distribution network line loss on-line computation method - Google Patents
Power distribution network line loss on-line computation method Download PDFInfo
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Abstract
The invention discloses a power distribution network line loss on-line computation method, and belongs to the field of power distribution network line loss computation. The method includes the steps that efficient refining line loss calculation and equivalent rapid calculation under a normal operation mode are carried out at first; then modeling is conducted on a power distribution network line loss computation system on the basis of the IEC61970/61968 international standard, and theoretical line loss computation and actual line loss computation are carried out in real time; at last, real-time measurement data of insufficient load points are processed to achieve unified measurement data real-time line loss computation of the whole network. An off-line line loss computation mode in the past is changed, the problems of off-line analysis and data repeated recording are avoided, and real-time computation and analysis of power distribution network line loss changes are effectively achieved.
Description
Technical field
The present invention relates to a kind of Line Loss of Distribution Network System on-line calculation method, relate in particular to a kind of multifactorial Line Loss of Distribution Network System on-line calculation method such as many power supplys and measurement information that take into account, belong to Line Loss Calculation field.
Background technology
Line Loss of Distribution Network System management is an important content of Management of Electrical Enterprise.By power distribution network being carried out to real-time theory wire loss calculating, thereby weak link and the line loss of grasp power distribution network actual motion form, and electric power enterprise can take reasonably to fall the utilization factor that damage measure improves electric flux targetedly.
For line loss, calculate, now mostly the emphasis of research is the analysis of line loss and falls the research of damage measure, as problems such as determining of: the power distribution network network reconstruct that the line loss of take is target, idle work optimization, building-out capacitor placement position, the line loss computational problem wherein relating to is mostly converted into power dissipation concerns, with the method for trend, solves.The document of specializing in line loss calculating aspect in traditional sense is also few, some new methods that propose in recent years mainly contain the clustering procedure, the Return Law of fuzzy theory approximatioss, dynamic power flow method (comprising various differences, fitting process) and load statistics aspect etc., all that the new method of other subject is incorporated in line loss calculating, although innovating to some extent aspect line loss calculating, these methods are not that the line loss that is applicable to real system is calculated.
Through Literature Consult, the document calculating about line loss of considering one-sided factor is quite abundant, but it is considerably less to consider the multifactorial line loss computing method such as many power supplys, measurement information and international standard, rarely seen Zhejiang Province has the online line loss calculating Research Literature that contains power station distribution network to deliver, but it belongs to discussion character substantially, do not there is more implementation.
Summary of the invention
The present invention is directed to the problem in background technology, propose a kind of multifactorial Line Loss of Distribution Network System on-line calculation method that takes into account.
The method comprises the steps:
Step 1: carry out high-efficiency precision refinement line loss and calculate, and the equivalence under normality operational mode is calculated fast;
It is to push back for power flow algorithm before adopting that described high-efficiency precision refinement line loss is calculated, and the load point of take measurement information per hour is input data, and considers pressure drop along the line, calculates line loss per hour; It is, according to normality operational mode and state, power distribution network impedance is carried out to equivalent process that described equivalence is calculated fast, thereby realize fast, calculates;
Step 2: based on IEC61970/61968 international standard, to Line Loss Calculation system modelling;
Described modeling is to obtain real time data from power distribution automation real-time system, from generalized information system, obtain electric network model and parameter, from power distribution management system acquisition model parameter, from marketing system, obtain electricity consumption data, carry out in real time theory wire loss calculating and practical line loss and calculate, and on the basis of data analysis, fall in real time and damage strategy and early warning;
Step 3: the real-time measurement data to insufficient load point are processed, realizes the unified metric data real-time line loss calculation of the whole network;
The acquisition methods of the real-time measurement data of described insufficient load point is: by analyzing power consumer consumer behavior, extract load pattern, utilize load pattern to calculate similarity and the non real-time metric data of insufficient load point, reproduce the real-time measurement data of insufficient load point.
Technique effect:
1, the modeling based on international standard has been guaranteed and the consistance of other system information model, can realize sharing and calculating of each system data.
2, changed off-line type line loss account form in the past, the problem of having avoided off-line analysis, Data duplication to record.
3, effectively alleviate amount of user effort, and effectively realized real-time calculating, monitoring, analysis and early warning that Line Loss of Distribution Network System changes.
Accompanying drawing explanation
Fig. 1 is the data acquisition schematic diagram of line loss computing system of the present invention.
Embodiment
Below the invention will be further described.
Along with the development of the technology such as communication, computing machine and intelligent apparatus, the progressively enlarged-area of collection in worksite terminal is used, and utilizes the data of these reflection distribution network real time executions can make the precision that line loss is calculated improve.The real-time theory wire loss of power distribution network calculates data used, as transformer substation voltage, meritorious, capacity of idle power etc., distributed power source point voltage, meritorious, reactive power etc., therefore they may be stored in the disparate databases of different system, need to consider Line Loss Calculation system and SCADA(data acquisition and monitoring) solution of system and other related system data-interfaces.
On the basis of the common information model in IEC61970 series standard, use object oriented analysis method to analyze the object of power distribution network, power distribution network is carried out to modeling, set up a classification main line/line model of power distribution network.On the basis of this model, power distribution network is carried out to topological analysis and real-time line loss calculation, and complete design and the coding of distribution network database.
According to the design feature of radial power distribution network network and multiple feed network, intend utilizing the line loss computational algorithm based on front pushing back Dai Fa and metric data resource to carry out real-time theory wire loss calculating to power distribution network.Based on front pushing back Power Flow Calculation Methods For Distribution Network for method, can effectively solve the problems such as power distribution network branch line is many, line length is long, wire diameter is little and cause impedance comparison is large, without setting up large-scale matrix, and convergence fast, reliable.This algorithm is by making full use of local real-time measurement information on distribution network, further use for reference the real time data that Power Network Status Estimation and load pattern similarity thought are supplemented non-abundant gauge point, load point power is injected in equivalence, and then calculate acquisition Line Loss of Distribution Network System per hour, obtain the distribution of node voltage and power and line loss.
From the derivation process of the Forward and backward substitution method of power flow calculation for radial networks, can find out, this algorithm be take meshed network equation as basis, as long as trend convergence, trend solution is exactly accurate.Moreover front pushing back for method takes full advantage of the feature that network is irradiation structure, without asking node admittance battle array and factor table thereof, the irredundant calculating of whole process, counting yield is high.
Line loss system obtains by sharing " work layer " correlation subsystem database the data that need, and in the present invention, the relation of line loss computational analysis system and other subsystem as shown in Figure 1.
Based on foregoing, the implementation step of the inventive method is as follows:
Step 1: the Line Loss of Distribution Network System that carries out many distributed electricals source point calculates fast, comprise that carrying out high-efficiency precision refinement line loss calculates, and the equivalence under normality operational mode is calculated fast.
It is to push back for power flow algorithm before adopting that high-efficiency precision refinement line loss is calculated, and the load point of take measurement information per hour is input data, and considers pressure drop along the line, calculates line loss per hour; It is, according to normality operational mode and state, power distribution network impedance is carried out to equivalent process that equivalence is calculated fast, thereby realize fast, calculates.
Step 2: based on IEC61970/61968 international standard, Line Loss Calculation system is carried out to modeling.
By modeling, make the information model standardization of Line Loss Calculation system, the information interaction of convenience and other Data Sources, avoids islanded system drawback.
Above-mentioned modeling is to obtain real time data from power distribution automation real-time system, from generalized information system, obtain electric network model and parameter, from power distribution management system acquisition model parameter, from marketing system, obtain electricity consumption data, carry out in real time theory wire loss calculating and practical line loss and calculate, and on the basis of data analysis, fall in real time and damage strategy and early warning.
Step 3: the real-time measurement data to insufficient load point are processed, realizes the unified metric data real-time line loss calculation of the whole network.
For some load point, there is measurement information, some only have the situation of accumulative total electricity data, by analyzing power consumer consumer behavior, extract load pattern, utilize load pattern to calculate similarity and the non real-time metric data of insufficient load point, thereby reproduce the real-time measurement data of insufficient load point.
Claims (5)
1. a Line Loss of Distribution Network System on-line calculation method, is characterized in that comprising the steps:
Step 1: carry out high-efficiency precision refinement line loss and calculate, and the equivalence under normality operational mode is calculated fast;
Step 2: based on IEC61970/61968 international standard, to Line Loss Calculation system modelling;
Step 3: the real-time measurement data to insufficient load point are processed, realizes the unified metric data real-time line loss calculation of the whole network.
2. Line Loss of Distribution Network System on-line calculation method according to claim 1, it is characterized in that: it is to push back for power flow algorithm before adopting that the high-efficiency precision refinement line loss in described step 1 is calculated, the load point of take measurement information per hour is input data, and considers pressure drop along the line, calculates line loss per hour.
3. Line Loss of Distribution Network System on-line calculation method according to claim 1, is characterized in that: it is, according to normality operational mode and state, power distribution network impedance is carried out to equivalent process that the equivalence in described step 1 is calculated fast, thereby realize fast, calculates.
4. Line Loss of Distribution Network System on-line calculation method according to claim 1, it is characterized in that: the modeling in described step 2 is to obtain real time data from power distribution automation real-time system, from generalized information system, obtain electric network model and parameter, from power distribution management system acquisition model parameter, from marketing system, obtain electricity consumption data, carry out in real time theory wire loss calculating and practical line loss and calculate, and on the basis of data analysis, fall in real time and damage strategy and early warning.
5. Line Loss of Distribution Network System on-line calculation method according to claim 1, it is characterized in that: the acquisition methods of the real-time measurement data of the insufficient load point in described step 3 is: by analyzing power consumer consumer behavior, extract load pattern, utilize load pattern to calculate similarity and the non real-time metric data of insufficient load point, reproduce the real-time measurement data of insufficient load point.
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| CN105119282A (en) * | 2015-09-10 | 2015-12-02 | 国网天津市电力公司 | On-line calculation system and method for theoretical line loss of power grid |
| CN111835003A (en) * | 2020-07-07 | 2020-10-27 | 国网河南省电力公司电力科学研究院 | Method and system for calculating theoretical line loss of medium-voltage distribution network in real time under multi-power-supply power supply |
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