KR101625064B1 - Section load calculation system for distribution network based on ami power usage - Google Patents

Abstract

The present invention relates to a distribution section load calculation system based on AMI power consumption, in which a current in a first specific time unit measured by an automatic switch is subdivided into a second specific time unit to eliminate an error, And a current transformer load which is a sum of a high-voltage customer load and a low-voltage customer load in a lower section using the corrected current of the automatic switch section, And a load area calculation unit for calculating a load area for AMI (Advanced Metering Infrastructure) power consumption of each sub-region by using the valid / ineffective power value of each interval, a load area calculation result for AMI power consumption in the lower region Based on the result of the algae calculation, Separate use of the load in accordance with the bottoms segments, and includes a load generation section for generating a load range suitable for each purpose.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an AMI power usage load distribution system,

The present invention relates to an AMI power usage-based distribution section load calculation system, and more particularly, to an AMI power consumption calculation system that not only includes measurement information of SCADA (Supervisory Control And Data Acquisition), DAS (Distributed on Automation System) The present invention relates to a distribution section load calculation system that can more accurately calculate a section load from a manual switch and a branch section in consideration of characteristics of an AMI (Advanced Metering Infrastructure) power consumption, which is an actual load of a system.

In general, the section load of the power distribution system is divided into three categories such as failure handling, load switching such as work interruption (shutdown), system optimization and reconfiguration, review and correction of protection cooperation, calculation of linkage between substations, improvement of loss and voltage drop, This is very important for system operation and planning.

However, in the conventional section load calculation method, it is possible to calculate the load up to the automatic switch section (or the automation section) using the measurement data of the distribution automation system (DAS). The manual switch section under the automatic switch section Many of the isolated intervals are in fact impossible to calculate the interval load.

In addition, conventionally, the lower sections are divided uniformly in consideration of only the positive (i.e., the horizontal distance of the designated section of the electric line), and then the section load is calculated. Accordingly, since the calculated section load is very different from the actual site, There is a problem that the result of the loss using the section load, the voltage drop, and the system reconstruction result is not reliable.

More specifically, conventionally, the section load calculation of the distribution automation system (DAS) is performed by using a load deviation of a power source side automation switch current and a load side automation switch on the basis of a part of an automation switch of a distribution line measuring current in an hour unit It is calculated by redistributing all sections between automation switchgear sections to the contrast ratio.

For reference, the switch load current is calculated on the basis of the previous 5 consecutive data on weekdays, and on the 4th week immediately before the Saturday / Sunday on the weekends, the interval load is calculated using the third data among the larger orders in the time period.

FIG. 1 is a diagram illustrating an example of a conventional power distribution system section and a section load calculation method. As shown in FIG. 1, when the power source side switch is selected as 55 (A) and the load side switch is selected as 20 (A) 35 (A) is allocated as a percentage of each positive interval between the intervals between the automation switches (for example, 18 intervals).

However, in some sections of the sections, there may be a section without a low-voltage transformer, and a high-pressure customer may use most of the power. In the conventional automation system,

The divided load as described above is used to quickly recover an electrostatic load except a fault section when a distribution line failure occurs. To this end, the line load of the static load section and the connected line must be 14,000 kW or less in case of emergency.

Generally, it takes about 3 hours to recover the fault section in case of an accident of the power distribution system. As shown in Fig. 1, the total load transferred to the connected line should not exceed the emergency operation condition. Therefore, by selecting a somewhat higher load current than the current load, it is possible to establish a switching method so that the connected line can operate below the emergency operating condition.

In addition, the section load is also used in applications such as optimization of distribution system of the distribution automation system, protection cooperation, etc. The distribution system optimization function calculates the voltage drop analysis, the load amount and the loss amount, It is a function to find the system. However, since the above-mentioned relatively high load is distributed to the bulb and used for the calculation, there is a problem that the load of the system is much different from the load of the conventional automation system, do.

Also, in calculating the voltage drop or power loss in the distribution automation system, since there is only a given section load, the voltage drop or power loss is calculated assuming the average load as the load required in the section. In actual system, All are not distributed on average.

For example, referring to FIG. 1, there are sections where high-pressure customers are concentrated at the ends, sections where low-pressure customers are distributed, and sections where high-pressure and low-pressure customers are mixed. Therefore, it is difficult to utilize in the field because it does not take account of the load characteristic of the section as described above.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2014-0032138 (Apr. 14, 2014, section load estimating apparatus and method of a public distribution system). However, since the above-mentioned background technology is an area load estimation technique for only an automatic switch section, it is not possible to estimate the area load at the lower part. In particular, when the automatic switch section is 2 km or more according to the power distribution design standard, There is a problem that the error rate of the loss and the voltage drop becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a system and a method for controlling the characteristics of AMI (Advanced Metering Infrastructure) power consumption, which is an actual load of a system, as well as measurement information of a transformer automation system (SCADA) And to provide a distribution section load calculation system which can more precisely calculate the section load up to the manual switch and the branch section.

The AMI power usage-based distribution section load calculation system according to an aspect of the present invention is a system for calculating an AMI power consumption based on AMI power consumption by dividing a current of a first specific time unit measured by an automatic switch in a second specific time unit, An automatic switch section current correcting section for correcting a current of an automatic switch section by performing algae calculation reflecting a system characteristic of a driving system; Using the corrected current of the automatic switch section, the transformer load, which is the sum of the high-voltage customer load and the low-voltage customer load, is assigned to the effective / ineffective power value of each section in the lower section and the power consumption of the Advanced Metering Infrastructure A lower section customer load processing section for calculating a load area for the lower section; An algae calculation unit for performing algae calculation based on a calculation result of a load area for AMI power consumption of the lower section; And a section load generation unit for classifying the usage of the load according to the classification criteria of the section load based on the result of the tide calculation and generating the section load suitable for each use.

In the present invention, the automatic breaker section current correcting section excludes the fault current generated in the substation and the power distribution system and the load current due to the work interruption in the section load calculation process, and the circuit breaker CB) The load deviation of the measurement current of the automatic switchgear (GA) is calculated with the same load deviation as the current pattern, and the load of the automatic switch section is subdivided by the second specific time unit. Then, The current of the automatic switch section is calculated as an input value, and when the current calculation of the automatic switch section is completed, the D / L ( If the ratio of the sum of the sectional loads to the sum of the sectional loads based on the CB current is smaller than the predetermined ratio And stores the correction current for the automatic switch section.

In the present invention, the lower section customer load processing section searches for a high-pressure customer and a transformer on a lower section basis, substitutes the location and weighing information of the high-pressure customer into valid / invalid power values in the lower section, If the transformer is performing load monitoring, the load monitoring data and the position are substituted into the effective / ineffective power value in the corresponding lower section to calculate the load of the low voltage customer by dividing the load applied to the transformer, And the load area is calculated.

In the present invention, the lower section customer load processing section performs AMR (Automatic Meter Reading) / AMI (Advanced Metering Infrastructure) for all low-voltage customers below a transformer, and adds the meter reading information when the meter reading information exists The transformer load information is generated, and the load area of each section is calculated by substituting the transformer position and load information for the valid / invalid power value in the corresponding lower section.

In the present invention, the lower section customer load processing section may be configured such that when the transformer performs load monitoring, and when the AMR / AMI is performed on all low-voltage customers below the transformer, The load area of each section is calculated by substituting the synthesized load and the transformer position information of the transformer with the valid / ineffective power value in the corresponding lower section.

In the present invention, the use of the above-mentioned section load is required when the maximum value of the section is required in units of D / L (distribution line), when the maximum load of the main transformer / substation CB is required, And a case where a maximum load is required is classified as a classification criterion.

In the present invention, the section load generator may inquire a section load of a result of a tide calculation at a predetermined third predetermined time unit to generate a section load in a predetermined period unit according to the classification criteria for the section load, / L (Distribution line) In case of maximum load reference, it is necessary to calculate the maximum value of the voltage drop and overvoltage in order to improve the voltage drop and overvoltage, The maximum loss value is calculated to generate the load at the time point and the load factor to improve the power factor, and the power factor minimum value is calculated to generate the load at the time point.

In the present invention, the section load generator calculates the maximum load time for each main transformer or substation in the case of the main transformer or substation maximum load reference, and then calculates the maximum load time for each main transformer or substation at that time A supply section is calculated, all section loads are generated based on the time point, and a section load of a missing section is additionally generated thereafter.

In the present invention, the section load generator calculates a maximum load time for each of the linked line group units CB when the classification criteria of the section loads are based on the connected line group unit CB maximum load criteria, A load interval for each connected line is calculated based on a maximum load time point, all interval loads are generated on the basis of the maximum load time point, and a section load of a missing interval is additionally generated.

The present invention makes it possible to more precisely calculate the section load to the manual switch and the branching section by using the AMI power consumption which is the actual load of the system and also to calculate the concentrated load and the distributed load considering the position and the size of the AMI power consumption in the system It is possible to calculate the flow, voltage drop, loss, etc., of the load close to the site situation by reflecting the characteristics.

Brief Description of the Drawings Fig. 1 is an exemplary diagram for explaining a section configuration of a conventional power distribution system and a section load calculation method; Fig.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an AMI power usage amount distribution system.
FIG. 3 is a table showing the details of load data managed by the load data management unit in FIG. 2; FIG.
FIG. 4 is a flow chart for explaining an operation process of the automatic opening / closing device section current correcting section in FIG. 2; FIG.
FIG. 5 is an exemplary view showing a SCADA measurement load pattern for explaining an interval load error according to an embodiment of the present invention; FIG.
FIG. 6 is an exemplary diagram showing a measurement value table and a SCADA current graph of a distribution automation system for explaining a conventional problem in connection with the present embodiment; FIG.
FIG. 7 is an exemplary diagram showing the result of segmenting the load current in FIG. 6; FIG.
FIG. 8 is a flowchart for explaining a process of processing AMI power consumption in a lower section of the lower section customer load processing section in FIG. 2; FIG.
FIG. 9 is an exemplary view showing a load distribution pattern in a lower section used in a distribution automation system according to the present embodiment; FIG.
10 is an exemplary view for comparing a conventional load distribution system and a load distribution system according to an embodiment of the present invention.
FIG. 11 is a table comparing voltage drop and loss based on the system and the load shown in FIG. 10 with a result calculated by a conventional method and a method according to the present embodiment (an improved method).
12 is a flowchart for explaining a bird's flow calculation method using the Newton-Raphson algorithm of the bird's flow calculation unit in FIG.
FIG. 13 is a table for classifying the section loads for section loads and the respective purposes for generating section loads in the section load generator for each equipment and system, in FIG. 2; FIG.
FIG. 14 is a flowchart for explaining a method of generating an interval load on a monthly basis in accordance with a usage classification standard in the section load generation unit for each facility and system in FIG. 2; FIG.

Hereinafter, an embodiment of a distribution section load calculation system based on AMI power consumption according to the present invention will be described with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

2 is a diagram illustrating a schematic configuration of a distribution section load calculation system based on an AMI power usage amount according to an embodiment of the present invention.

2, the distribution section load calculation system based on the AMI power consumption according to the present embodiment includes a load data management section 110, an automatic switch section current correction section 120, a lower section customer load processing section 130, An algae calculation unit 140, and an interval load generation unit 150 for each facility and system.

The load data management unit 110 manages power distribution system and load information (i.e., load data) (see FIG. 3).

3 is a table showing the details of load data managed by the load data management unit in FIG.

Referring to FIG. 3, the load data includes a distribution transformer pull-up load calculated based on substation measurement information, a measurement value of a power distribution system and an automatic switch, a monthly meter reading information of a low-voltage customer, Information, AMI metering information of high pressure and low pressure customers, and the like. The load data may be delivered from at least one or more cooperating systems (e.g., SCADA, DAS, NDIS, transformer load monitoring system, AMI).

The automatic current switch section current correcting section 120 divides the current of the first specific time (for example, 1 hour) measured by the automatic switch into the second specific time (for example, 5 minutes) to calculate an error And performs the calculation of the tidal current reflecting the system characteristics of the distributed power source and the loop driving system to compensate the current of the automatic switch section.

FIG. 4 is a flowchart illustrating an operation of the automatic opening / closing circuit section current correcting section in FIG.

Referring to FIG. 4, since the automatic breaker section current correcting unit 120 firstly detects a fault current generated in a substation and a power distribution system and a load current (i.e., a failure / a cease current) due to a work interruption (Or removed) in the load calculation process (S101).

At this time, the measurement cycle of the automatic switch of the distribution automation system (DAS) is one hour unit. Therefore, in the present embodiment, if an interval load is to be calculated at another time interval (e.g., 5 minutes, 15 minutes, etc.), an error may be generated as much as that (see FIG. Therefore, it is necessary to correct the current in the same time zone using the SCADA data in order to reduce the section load error caused by the difference in the measurement time.

5 is a diagram illustrating an SCADA measurement load pattern for explaining an interval load error according to an embodiment of the present invention.

5 (a) shows an example of a load pattern of the SCADA measurement current for five minutes during one day, and FIG. 5 (b) shows an example of a data pattern 12 for one hour from 8:00 pm to 9:00 pm This is an example of enlarging only the dog.

As shown in (b) of FIG. 5, since the measurement current for one hour is largely shaken, the use of the measurement data of the distribution automation system (DAS) means that much error is included.

As described above, since the switchgear measurement of the distribution automation system (DAS) is determined by the communication infrastructure rather than the measurement at the same time, there is a problem that much difference occurs even within one hour of the switchgear measurement (refer to FIG. 6) .

6 is an exemplary diagram showing a measurement value table and a SCADA current graph of a distribution automation system (DAS) for explaining a conventional problem in connection with the present embodiment.

Referring to the table shown in FIG. 6 (a), the measured time and measured values in the actual distribution automation system (DAS) show a measurement time difference of about 10 minutes in each section (for example, a CB section and a GA section) Referring to the SCADA current graph shown in FIG. 6 (b), it can be seen that there is a difference in the measurement time difference (about 10 minutes) It can be seen that the SCADA current fluctuates greatly.

Therefore, the above problem (a problem that a large difference occurs even within one hour when the switching time is measured within one hour) may eventually lead to a case where the load side switch current is larger than the power switch side switch current even in the dendrite system, DAS), there may be a case where the load side switch current is larger than the power side switch current.

For example, as shown in FIG. 6, when comparing the data of the SCADA and the DAS system measured at a specific time, it can be seen that the load side load current (for example, 195) is larger than the power side load current Which is not a larger load current, but a problem due to the difference in measurement time. In Fig. 6, GA (GasSwitch Auto) is an automation switch and CB (Circuit Breaker) is a breaker.

At this time, the load current is influenced by the section load, but generally has the same pattern. Therefore, in this embodiment, the load deviation of GA (automatic switch) measurement current is calculated with the same load deviation as the CB (breaker) current pattern measured by SCADA (S102), the load of the automatic switch section is set to the second specific time unit : 5 minutes) (S103), the result of the subdivided load pattern of the automatic switch section as shown in Fig. 7 can be obtained.

Fig. 7 is an exemplary diagram showing the result of segmenting the load current in Fig.

Although the correction as shown in FIG. 7 is not accurate, the load deviation between the automation switches is clearly distinguishable.

Next, when the load side load current is larger than the power source side load current in each section, the error current is determined to be removed (S104).

On the other hand, the switch of the conventional automation system does not provide the directional information except the bidirectional protection device. Therefore, in the situation where the distributed power source such as renewable energy is increasing, the current value of the non-directional switchgear is determined by the fact that the load current is the power provided by the electric supplier (for example, KEPCO) I can not.

Accordingly, if there is an automatic switch at the point of connection between the distributed power source and the power distribution system, the measured current is the power generation amount, and thus the counter current of the distributed power source is reflected (S105).

In other words, when the algae calculation described below is performed, the generation current is minus (subtracted), and if the algae calculation result is mismatched, the automatic switch at the front of the distributed power source is sequentially minus (subtracted).

In order to reflect the current direction and the loop driving system of the system connected with the distributed power source during the algae calculation, the algae calculation is performed for the current correction purpose only for the automatic switchgear section. The algae calculation is performed using the current of the automatic switch section as an input value using the Newton-Raphson algorithm (S106).

When the calculation of the tidal current in the automatic switch section is completed, all the section loads are added in units of D / L (distribution line), and the ratio of the summed section loads based on the CB (breaker) %) (S107), the automatic opening / closing section section correction current as the final step of this process (operation of the automatic opening / closing section current correcting section) is stored (S108), and if not, the error current removing operation is repeated from S104 . At this time, the automation switch section correction current may be stored in a third specific time unit (e.g., 15 minutes).

Since the above procedure (operation of the automatic opening / closing section current correcting section) is to correct the current of the automatic switch section, the ratio for comparing the sum of the divided section loads based on the CB (breaker) current ) Is set to 10% or less considering the degree of divergence and the error rate.

2, the lower section customer load processing unit 130 performs an operation of substituting a transformer load that is a sum of a high-pressure customer load and a low-pressure customer load in a lower section (that is, substituting the effective / ineffective power value of each section) (See FIG. 8).

On the other hand, the power distribution system is considerably complicated even when only the section between the automatic switch and the other automatic switch is visible. For example, there may be a section in which the low-voltage transformer passes through without any low-voltage transformer, a section in which only the low-voltage transformer exists, a case in which there is only a high- There may also be a mixed section.

Therefore, in the conventional automation system, it is impossible to know whether there is a low-voltage transformer in the section between the automation switches.

However, in the present embodiment, the section load is calculated using the weighing information of the high-pressure customer, the load monitoring data of the low-voltage transformer, the low-pressure AMI metering information, or the transformer pulling-

FIG. 8 is a flowchart illustrating a process of processing AMI power consumption in a lower section of the lower section customer load processing section in FIG.

As shown in FIG. 8, the lower section customer load processing unit 130 searches for a high-voltage customer and a transformer in units of lower sections (S201).

Next, the position and weighing information of the high-pressure customer are substituted into the corresponding lower section (S202).

Since the metering information is an active power amount and a reactive power amount in units of a third specific time (for example, 15 minutes), it is multiplied by 4 to convert the metering information into active power and reactive power, (Minutes).

Next, the lower section customer load processing section 130 classifies the transformer application load to substitute the load of the low pressure customer (S203).

According to the result of classifying the transformer applied load, the lower section customer load processing unit 130 firstly monitors the load monitoring data and the position of the transformer load monitoring unit in the case of the transformer load monitoring (S204) (S205).

Next, if the meter reading information exists (S206) by performing AMR (Automatic Meter Reading) / AMI (Advanced Metering Infrastructure) for all low pressure customers below the transformer, the meter reading information is added to generate transformer load information (S207). Then, the transformer position and load information are substituted into the valid / ineffective power values of each section (S208).

In the other cases (S209) except for the above two, the synthesized load of the transformer and the position information of the transformer are substituted into the effective / ineffective power of each section (S210).

Then, the load area is calculated to calculate the load of the lower section considering the AMI power consumption characteristic (S211).

As described above, according to the present embodiment, a high load (LP: active power, LQ: reactive power) is determined by determining whether the load is a distributed load or a concentrated load by using the high pressure customer and low pressure transformer position information in the lower section, Can be calculated.

9 is an exemplary view showing a load distribution pattern in a lower section used in the distribution automation system according to the present embodiment.

9 (a) shows a distributed load type indicating that the load is used evenly in the lower section, FIG. 9 (b) shows a terminal concentrated load type, and FIG. 9 (c) And the terminal concentrated load.

FIG. 10 is a diagram for explaining a conventional load distribution method and a load distribution method according to an embodiment of the present invention.

10 (a), since the conventional distribution automation system does not consider the load characteristics of the lower sections, the same sections as (1), (4) and (6) are uniform load distributions regardless of the actual load position and size There is a problem in that the load distribution is uniformly performed even in the section where there is no actual load as in the case of the sections (2), (3), and (5)

Referring to FIG. 10 (b), in the embodiment of the present invention, the load distribution is performed only in the section where the actual load exists. That is, since the section ① is a terminal concentrated load, the load area is calculated as 11A for the section 1, the section where the concentrated load and the distributed load are mixed in the section 4, and the distribution load section including only the low pressure transformer , And calculates the load area based on the position and size of the load. And, since the interval ②, ③, ⑤ is a no-load section, the load area is not calculated.

Hereinafter, a method of calculating the load area (i.e., load factor) of the lower section will be described.

For example, in the case of the polygon having eight points as in the above (4), it is possible to calculate the load area (i.e., the load ratio) by constructing a matrix as follows.

하면 폴리곤에 대한 면적이 계산된다.In other words,

The area for the polygon is calculated.

The method of calculating the load area is a method described by way of example.

When the conventional method is compared with the method according to the present embodiment (the improved method), the conventional method is 50%, and the method according to the present embodiment is 100%. That is, in the conventional system, the load area of all the sections is 50%, but the actual load area is calculated in the system (improvement system) according to the present embodiment.

The voltage drop and loss based on the system and the load as shown in FIG. 10 can be calculated by the following calculation formula as shown in FIG.

The impedance Z is 0.33195 Ω and the resistance R is 0.30415 Ω, assuming ACSR-95mm for the normal type, ACSR-58mm for the neutral type, and 1km for each sub zone.

FIG. 11 is a table comparing voltage drop and loss based on the system and the load shown in FIG. 10, in comparison with a result calculated by a conventional method and a method according to the present embodiment (an improved method).

Referring to the table shown in FIG. 11, it can be seen that the accuracy of the voltage drop and loss calculation is improved when the AMI power consumption characteristic according to the present embodiment is considered.

More specifically, the voltage drop was calculated to be 379 V in the conventional method (conventional method) and 289 V in the method according to the present embodiment (the improved method). This is because the method according to the present embodiment is calculated to be small since the occurrence of the voltage drop is small in the concentrated load and the no-load period.

The loss of the conventional method (conventional method) is 80,617 W, and the method according to the present embodiment (improvement method) is 43,508 W, which is nearly double the difference. The reason for this is that there is a characteristic that the loss increases in the case of a load concentrated at the end of the distribution line. Since the line illustrated in FIG. 10 has a large amount of AMI power consumption at the front end of the segment and there is a no-load segment, The calculation results are small.

Referring back to FIG. 2, the algae calculation unit 140 performs algae calculation based on the calculation of the load area for the amount of AMI power used in the lower section.

For example, the algae calculation can be calculated by the Newton-Raphson algorithm, but is not limited to the Newton-Raphson algorithm.

FIG. 12 is a flowchart for explaining a bird's current calculation method using the Newton-Raphson algorithm of the bird's current calculation unit in FIG.

12, the algae calculation unit 140 calculates the admittance matrix Y (S301) by receiving the systematic data (e.g., section configuration of the system, section length, line information, load data, Since the voltage of each bus (which can be received by SCADA) and the initial value of iterative calculation (the calculation of the algae must be repeated until the convergence is performed, the value may be an infinite loop in some cases. (S302).

)을 계산해서 발산(mismatch : 해를 못 찾은 경우) 여부를 체크(판단)한다(S303).And the valid / reactive power (

) (Step S303). In step S303, it is determined whether or not a mismatch is found.

At this time, the number of iterations (h), the end limit (tolerance), and the like are initialized. Here, k = 1 to n, h = iteration counter, and # denotes a number and a branch.

The concentrated load and the distributed load are reflected when calculating the admittance matrix.

이면, 즉, 최대 유효/무효 전력이 종료 한계치 이하이면(S304의 예) 상기 조류 계산부(140)는 결과값(모선 전압 및 선로 조류)을 출력한다(S305). 그러나 상기 최대 유효/무효 전력이 종료 한계치 이하가 아니면(S304의 아니오), 상기 조류 계산부(140)는 자코비안 행렬을 이용한 계산을 통해(S306) 모선 전압의 변화량을 계산하여(S307) 모선 전압을 업데이트 한다(S308).Next, if

That is, if the maximum valid / reactive power is less than the end limit value (YES in S304), the algae calculation unit 140 outputs the result value (bus voltage and line algae) (S305). However, if the maximum valid / reactive power is not less than the end limit value (NO in S304), the algae calculation unit 140 calculates the change amount of the bus voltage through calculation using the Jacobian matrix (S306) (S307) (S308).

)을 계산해서 발산(mismatch : 해를 못 찾은 경우) 여부를 체크(판단)한다.At this time, if the number of iterations (h) is equal to or greater than the maximum number of iterations, a result value (bus voltage and the result of calculating the line aline of each phase) is output (S305). However, if the number of iterations (h) is smaller than the maximum number of iterations, the process returns to step S303 and the effective / ineffective power (

) To determine whether or not a mismatch has been found.

Referring again to FIG. 2, the facility and system-specific section load generator 150 classifies the classification load and classification of the section load, and generates (i.e., calculates) a section load suitable for each application (see FIG. 13).

FIG. 13 is a table for classifying the interval load for generating an interval load in the section load generation unit for each facility and system and the respective applications in FIG. 2.

Referring to FIG. 13, the above-mentioned purpose is applied when the maximum value of the interval is required in units of D / L (distribution line), when the maximum load of the main transformer / substation CB (breaker) is required, When the maximum load is required, it is classified as a classification standard.

FIG. 14 is a flowchart for explaining a method of generating an interval load on a monthly basis in accordance with a usage classification standard in the section load generation unit for each equipment and system in FIG. 2; FIG.

As shown in FIG. 14, the section load generator 150 for each facility and system inquires the section load of the result of algae calculation in units of 15 minutes (S401) The load is generated (i.e., calculated) (S402).

First, in the case of the D / L (distribution line) maximum load reference (S403), the maximum value of the interval where the voltage drop and the overvoltage occur is calculated for the purpose of improving the voltage drop or the overvoltage, (Step S404). If the object is to improve the power factor, the power factor minimum value is calculated (step S404) And generates (i. E., Calculates) the load between the point in time and the point in time (S406).

Next, in the case of a main transformer (MTR) or substation maximum load reference (S407), a maximum load time is calculated for each main transformer (MTR) or each substation (S408), and then the main transformer (MTR) And calculates (i.e., calculates) all the section loads based on the time point (S409). Then, a section load of the missing section is generated (i.e., calculated) (S410).

Next, in the case of the CB (blocker) maximum load reference of the connected line group group (S411), the maximum load time point is calculated for each CB in the linked line group group (S412) The supply section for each line is calculated and all section loads are generated (i.e., calculated) based on that point of time (S413). Then, a section load of the missing section is generated (i.e., calculated) (S414).

In this case, during the interval load generation (S410 and S414) of the missing interval, there may occur a period in which the supply interval is missed because the maximum load point is different for each of the main transformer, the substation, and the connected line group. (I.e., computes) a larger value among the loads of the missing interval based on the reference value.

As described above, the Advanced Metering Infrastructure (AMI) related to the present embodiment will be built for all customers and transformers by 2020, and the more accurate the interval load calculation becomes, the more effective it is. However, Since the metering success rate and the timely reception ratio of the transformer measurement are not 100%, there is a limit to improve the accuracy of the section load calculation.

However, in this embodiment, the section load is calculated by combining the distribution automation measurement information, the customer metering information, and the transformer measurement information as described above, so that the section load can be calculated more accurately.

Meanwhile, the present embodiment can be utilized for selecting an optimal location of an automated switch in consideration of a concentrated load in connection with the operation of a distribution system operation task, and it can be utilized for load prediction, and the substation-MTR-CB- By predicting load, overload can be prevented in advance. In addition, it can be used extensively in distribution planning tasks such as eliminating overload and eliminating voltage drop, and it can be used for transmission and distribution planning work through analyzing the connection power of the substation and utilization rate.

As described above, the embodiment according to the present invention is effective in improving the power quality and optimally operating the power distribution system by calculating the section load with improved accuracy up to the section and the lower section of the power distribution system, It helps improve the quality, helps to overcome the overload and improves the accuracy of the load switching scheme, and improves the accuracy of calculation and restoration of connections between substations and improves system reliability (load leveling, loss minimization) And it is possible to reflect the situation at the time of establishing operation procedure of fault recovery SOP (D / L, main transformer, substation restoration plan), improve reliability in establishment of substation and distribution breakdown operation procedure, . ≪ / RTI >

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, I will understand the point. Accordingly, the technical scope of the present invention should be defined by the following claims.

110: Load data management unit
120: Automatic breaker section current correcting section
130: Lower section customer load processing section
140:
150: section load generation section for each facility and system

Claims (9)

The current of the first specific time unit measured by the automatic switch is divided into the second specific time unit to eliminate the error and the current of the automatic switch section is corrected by performing the algae calculation reflecting the system characteristics of the distributed power source and the loop driving system An automatic switch section current correcting section;
Using the corrected current of the automatic switch section, the transformer load, which is the sum of the high-voltage customer load and the low-voltage customer load, is assigned to the effective / ineffective power value of each section in the lower section and the power consumption of the Advanced Metering Infrastructure A lower section customer load processing section for calculating a load area for the lower section;
An algae calculation unit for performing algae calculation based on a calculation result of a load area for AMI power consumption of the lower section; And
And an interval load generator for classifying the load usage according to the interval load classification based on the alga calculation result and generating an interval load corresponding to each of the divided applications,
The lower section customer load processing section searches for a high-pressure customer and a transformer in units of lower sections, calculates a section load by substituting the location and metering information of the high-pressure customer into valid / invalid power values in the lower section, If the transformer is performing load monitoring, calculate the load area of each section by substituting the load monitoring data and the position into the valid / invalid power value in the corresponding lower section. Wherein the AMI power usage based distribution terminal load calculation system is characterized by:
The apparatus according to claim 1, wherein the automatic current-
(CB) current pattern measured by Supervisory Control And Data Acquisition (SCADA), except for the fault current generated by the substation and the power distribution system and the load current due to the work interruption. ), The load of the automatic switch section is subdivided by the second specific time unit, and when the load current is larger than the power supply side load current in each section, the error current is determined to be removed, The current of the automatic switch section is calculated as an input value after the inverse current of the distributed power source is reflected, and when the current calculation of the automatic switch section is completed, all the section loads are added in units of D / L (distribution line) And stores the correction current for the automatic switch section if the ratio of the sum of the section loads based on the current is smaller than a preset ratio Is the AMI power usage based distribution section load calculation system.
delete The apparatus according to claim 1, wherein the lower-
(AMR) / AMI (Advanced Metering Infrastructure) for all low-voltage customers below the transformer, and when the meter reading information exists, the meter reading information is added to generate transformer load information, And the load area of each section is calculated by substituting the information with the valid / ineffective power value in the corresponding sub-section, and the AMI power usage based distribution section load calculation system.
The system according to claim 4, wherein the lower-
If the transformer is under load monitoring and the AMR / AMI is applied to all low-voltage customers under the transformer, the combined load and transformer position information of the transformer are taken into the corresponding sub-section And calculates the load area of each section by substituting the effective / ineffective power with the effective / ineffective power value.
2. The method of claim 1,
When the maximum value of the interval is required in units of D / L (distribution line), when the maximum load of the CB in the main transformer / substation unit is required, and when the maximum load of the CB is required in the connected line group group, Wherein the AMI power usage based distribution terminal load calculation system is characterized by:
The apparatus of claim 1, wherein the section load generator comprises:
A section load of a result of the algae calculation is inquired at a predetermined third predetermined time unit to generate a section load in a predetermined period unit according to the classifying criteria of the section load,
In case of D / L (distribution line) maximum load reference, it is necessary to calculate the maximum value of the section where the voltage drop and the overvoltage occur in order to improve the voltage drop and the overvoltage, And calculating a power factor minimum value to generate an interval load based on the AMI power consumption if the objective is to improve the power factor, Load calculation system.
The apparatus of claim 7, wherein the section load generator comprises:
If the classification criteria for the above-mentioned section load is the main transformer or substation maximum load reference,
A maximum load point is calculated for each main transformer or substation, a supply interval is calculated for each main transformer or substation at the time point, all interval loads are generated based on the time point, and a section load of a missing interval is additionally generated Wherein the AMI power usage based distribution terminal load calculation system is characterized by:
The apparatus of claim 7, wherein the section load generator comprises:
If the classification criteria of the above section load is based on the connected line group unit CB maximum load standard,
A maximum load time is calculated for each connected line group unit CB, a supply interval for each connected line is calculated based on the maximum load time of one CB among the connected line group units CB to generate all the interval loads based on the maximum load time, Wherein the AMI power usage-based distribution load calculation system further comprises:

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