KR20210023418A - Apparatus for measuring an amount of power for performing a synthesis metering of a plurality of meters - Google Patents

Abstract

The present invention relates to a device for measuring the sum of watt-hours of a plurality of watt-hour meters even when distributed power is connected, and calculating the sum of watt-hours by using power usage information stored in a watt-hour meter, so that there is no error in watt-hour calculation. According to an embodiment of the present invention, the device comprises: a reception unit receiving power usage information, and LP interval and transformer multiple of each of the plurality of watt-hour meters from a plurality of watt-hour meters at a predetermined period; a storage unit storing the power usage information received by the reception unit; and a calculation unit calculating the sum of watt-hours by using the power usage information.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention TECHNICAL FIELD [0002] An electric energy measuring device for measuring the total amount of electric power of a plurality of electric meters.

The present invention relates to an watt-hour measurement device for measuring the total amount of wattage of a plurality of watt-hour meters, and more specifically, even when distributed power sources are connected, the total amount of wattage of a plurality of watt-hour meters can be calculated, and the power consumption information stored in the watt-hour meter is used. The present invention relates to an electric power amount measuring apparatus for measuring the total amount of electric power of a plurality of electric power meters such that there is no error in calculating the electric power amount by calculating the total amount of electric power.

Electric power companies install watt-hour meters at each customer and charge a fee according to the amount of electricity used by each customer. Customers using large amounts of power use multiple transmission lines or distribution lines, and in this case, an watt-hour meter must be installed for each line. For customers with more than one watt-hour meter installed, the metered data from the plurality of watt-hour meters must be summed up. However, since the watt hour meter does not have a function for summing the amount of electricity, a separate device must be used to perform the combined metering. However, a synthetic weighing device for performing synthetic weighing must be purchased and installed at the customer, and the cost of the synthetic weighing device is expensive, and because it is an imported product, remote meter reading is not possible, so the meter reader has to go to the site to check the amount of electricity. there is a problem.

In addition, the combined metering device counts the pulse signal provided by the watt-hour meter to measure the amount of power, but when a problem occurs in the pulse line, there is a problem in that the amount of power cannot be properly measured.

The present invention is to solve the above-described problem, it is possible to calculate the total amount of wattage of a plurality of watt-hour meters even when a distributed power supply is connected, and by calculating the total amount of wattage using the power consumption information stored in the watt-hour meter, there is an error in the calculation of the amount of electricity. An object of the present invention is to provide an electric energy measurement device for measuring the total electric energy of a plurality of electric energy meters.

In addition to the technical problems of the present invention mentioned above, other features and advantages of the present invention will be described below or will be clearly understood by those of ordinary skill in the art from such technology and description.

The wattage measuring device for measuring the total amount of wattage of a number of watt-hour meters according to an embodiment of the present invention to achieve the above-described object receives power consumption information from a plurality of watt-hour meters at regular intervals, an LP interval of each of a plurality of watt-hour meters, and a transformer multiple. It may include a receiving unit to perform, a storage unit for storing the power consumption information received by the receiving unit, and a calculation unit for calculating the total amount of power using the power consumption information.

The wattage measuring apparatus for measuring the total amount of wattage of a plurality of watt-hour meters according to an exemplary embodiment of the present invention may calculate the total amount of wattage of the plurality of watt-hour meters even when distributed power is connected.

In addition, by calculating the total amount of power using the power consumption information stored in the power meter, it is possible to prevent errors in calculating the amount of power.

In addition, other features and advantages of the present invention may be newly recognized through embodiments of the present invention.

FIG. 1 is a diagram illustrating a power amount measurement system for measuring a total amount of power of a plurality of power meters according to an exemplary embodiment of the present invention.
2 is a diagram illustrating a current flow when a distributed power supply is connected according to an embodiment of the present invention.
3 is a diagram illustrating a configuration of a power amount measuring apparatus for measuring the total amount of power of a plurality of power meters according to an embodiment of the present invention.
4 is a diagram illustrating an example of power amount information received from a power meter according to an embodiment of the present invention.
5 is a diagram illustrating an example of calculating a 15-minute synthesized power demand according to an embodiment of the present invention.

In order to clearly describe the present invention, parts irrelevant to the description have been omitted, and the same reference numerals are attached to the same or similar components throughout the specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

FIG. 1 is a diagram illustrating a power amount measurement system for measuring a total amount of power of a plurality of power meters according to an exemplary embodiment of the present invention.

Referring to FIG. 1, an watt-hour measurement system 1000 for measuring the total amount of wattage of a plurality of watt-hour meters according to an embodiment of the present invention includes a power system 100, a watt-hour meter 200, and a watt-hour measurement device 300. I can.

The power system 100 may supply power to the customer 400 according to the amount of power demanded by the customer 400. Here, when the power demand of the customer 400 is large, power may be supplied to the customer 400 using a plurality of distribution lines. The watt hour meter 200 may be installed on each of a plurality of distribution lines to measure an amount of power supplied to each distribution line.

For example, the first watt hour meter 202 may be installed on the first distribution line to measure the amount of power supplied from the power system 100 through the first distribution line. In addition, the second watt hour meter 204 may be installed on the second distribution line to measure the amount of power supplied from the power system 100 through the second distribution line.

The power amount measurement device 300 may measure the total amount of power by summing the amount of power measured by the first and second power meters 202 and 204.

Specifically, the conventional power amount measuring apparatus counts the pulse signals transmitted from the first watt hour meter 202 and the second watt hour meter 204 to measure the idle amount of power. That is, the first watt-hour meter 202 and the second watt-hour meter 204 transmitted a pulse signal to the watt-hour measurement device through a pulse line each time the amount of power was measured, and the watt-hour measurement device counts the transmitted pulse signal and calculates the total amount of electricity. It was measured. However, when a problem occurs in the pulse line, a pulse signal may be omitted, and accordingly, an error may occur in the amount of power measured by the power amount measuring apparatus. In addition, since the pulse signal is not stored, the error cannot be corrected even if an error occurs.

Accordingly, the wattage measuring apparatus 300 according to an embodiment of the present invention may receive power consumption information from the first watt hour meter 202 and the second watt hour meter 204 and measure the total amount of power. Accordingly, since the wattage measuring apparatus 300 according to an embodiment of the present invention does not count the pulse signal from the first watt-hour meter 202 and the second watt-hour meter 204, the total amount of wattage is calculated regardless of the presence or absence of an abnormality in the pulse line. I can measure it.

2 is a diagram illustrating a current flow when a distributed power supply is connected according to an embodiment of the present invention.

Referring to FIG. 2, there is a case where the distributed power system 500 installed by the power generation company is connected to the customer 400. That is, the customer (customer bus, 400) may be provided with power from the power system 100 and the distributed power system 500.

Power generated or consumed by the distributed power system 500 in order to calculate the accurate total amount of power in the customer 400 connected to the distributed power system 500 while receiving power from the power system 100 using a plurality of distribution lines. You have to add or subtract.

In order to add or subtract the power generated or consumed by the distributed power system 500, the power amount measuring device distinguishes whether power is being received or transmitted. However, the conventional power amount measuring device simply counts the pulse signal, and it is not possible to distinguish whether the pulse signal provided to the power amount measuring device is the amount of received power or the amount of transmitted power.

Accordingly, the wattage measurement device 300 according to an embodiment of the present invention can measure active power, forward reactive power, reverse reactive power, and apparent power. Accordingly, a plurality of distribution lines are used, and a distributed power system ( 500) can be more accurately measured the total amount of power of the customer 400 is linked.

3 is a diagram illustrating a configuration of a power amount measuring apparatus for measuring the total amount of power of a plurality of power meters according to an embodiment of the present invention.

Referring to FIG. 3, the power amount measuring apparatus 300 according to an embodiment of the present invention may include a receiving unit 310, a storage unit 320, and a calculation unit 330.

The receiving unit 310 may receive power usage information from the plurality of watt hour meters 200 at a certain period. In addition, the receiver 310 may receive an LP interval and a transformer multiple of each of the plurality of watt hour meters 200.

Referring to FIG. 4, the plurality of watt-hour meters 200 are bidirectional watt-hour meters 200, and the plurality of watt-hour meters 200 may be defined as M1, M2, M3, ..., Mn in an arbitrary order. The receiving unit 310 may receive an LP interval from a plurality of watt hour meters 200, and the LP interval may be a storage interval of power usage information or a reception interval of power usage information. The unit of the LP interval may be minutes, and the assignment variable may be Mn[Lm]. Here, the allocation variable may be a variable for describing the measurement of the total amount of power according to an embodiment of the present invention. That is, the allocation variable may be applied to and used in the actual power amount measuring apparatus 300 and the power amount measuring system 1000, or may be applied as another type of allocation variable. Further, Mn refers to a plurality of watt-hour meters 200, and in the case of M1[Lm], may mean an LP interval of the first watt-hour meter M1 received from the first watt-hour meter M1.

In addition, the receiving unit 310 may receive a transformer multiple from the plurality of watt hour meters 200, and the transformer multiple may be an instrument multiple of each of the plurality of watt hour meters 200. The unit of the transformer multiple may be times, and the assigned variable may be Mn[Tr]. Here, [Tr] may be [PT ratio] * [CT ratio]. Further, Mn refers to a plurality of watt-hour meters 200, and in the case of M1[Tr], may mean a transformer multiple of the first watt-hour meter M1 received from the first watt-hour meter M1.

In addition, the receiving unit 310 may receive power consumption information from a plurality of watt-hour meters 200, and the power consumption information includes the amount of received active power, the amount of receiving forward reactive power, the amount of ground reactive power received, the amount of apparent power received, the amount of effective power transmitted, and the power transmission. It may include the amount of real reactive power, the amount of ground reactive power for transmission, and the amount of apparent power for transmission. Here, the plurality of watt-hour meters 200 may be bi-directional watt-hour meters.

The amount of active power received represents the forward active energy import, and the unit may be kWh. In addition, the allocation variable of the received effective power amount may be Mn[Pi], and Mn refers to a plurality of watt hour meters 200, and in the case of M1[Pi], the first watt hour meter M1 received from the first watt hour meter M1 ) Can mean the amount of effective power received.

In addition, the amount of effective power transmission represents an active energy export in the reverse direction, and the unit may be kWh. In addition, the allocation variable of the amount of effective power transmission may be Mn[Pe], and Mn refers to a plurality of watt hour meters 200, and in the case of M1[Pe], the first watt hour meter M1 received from the first watt hour meter M1 ) Can mean the amount of effective power transmitted.

In addition, the amount of ground reactive power received represents a forward lag reactive import, and the unit may be kVarh. In addition, the allocation variable of the amount of ground reactive power received may be Mn[gQi], and Mn denotes a plurality of watt hour meters 200, and in the case of M1[gQi], the first watt hour meter received from the first watt hour meter M1 ( M1) can mean the amount of ground reactive power received from the ground.

In addition, the transmission ground reactive power amount represents the reverse ground reactive power (lag reactive export), and the unit may be kVarh. In addition, the allocation variable of the amount of reactive power on the transmission ground may be Mn[gQe], and Mn refers to a plurality of watt-hour meters 200, and in the case of M1[gQe], the first watt-hour meter received from the first watt-hour meter M1 ( M1) can mean the amount of reactive power on the ground.

In addition, the received lead reactive power amount represents the forward lead reactive import, and the unit may be kVarh. In addition, the allocation variable of the amount of receiving forward reactive power may be Mn[dQi], and Mn refers to a plurality of watt-hour meters 200, and in the case of M1[dQi], the first watt-hour meter received from the first watt-hour meter M1 ( It can mean the amount of reactive power received from M1).

In addition, the amount of reactive power in the forward phase of transmission represents the reverse ground reactive power (lead reactive export), and the unit may be kVarh. In addition, the allocation variable of the amount of reactive power on the transmission ground may be Mn[dQe], and Mn refers to a plurality of watt-hour meters 200, and in the case of M1[dQe], the first watt-hour meter received from the first watt-hour meter M1 ( It can mean the amount of reactive power in M1).

In addition, the amount of apparent power received represents an apparent energy import in the forward direction, and the unit may be kVAh. In addition, the allocation variable of the amount of apparent power received may be Mn[Ai], and Mn refers to a plurality of watt-hour meters 200, and in the case of M1[Ai], the first watt-hour meter M1 received from the first watt-hour meter M1 ) Can mean the amount of apparent power received.

In addition, the amount of apparent power transmitted represents an apparent energy export in the forward direction, and the unit may be kVAh. In addition, the allocation variable of the apparent amount of transmitted power may be Mn[Ae], and Mn refers to a plurality of watt-hour meters 200, and in the case of M1[Ae], the first watt-hour meter M1 received from the first watt-hour meter M1 ) Can mean the amount of apparent power transmitted. 4 is a diagram illustrating an example of power amount information received from a power meter according to an embodiment of the present invention.

On the other hand, when the plurality of watt-hour meters 200 are the one-way watt-hour meters 200, the receiving unit 310 is a power including the amount of active power received from the plurality of watt-hour meters 200, the amount of incoming forward reactive power, the amount of ground reactive power received, and the amount of apparent power received. It is possible to receive usage information, or receive power usage information including an amount of effective power transmission, an amount of reactive power on top of transmission, an amount of reactive power on the ground, and apparent power of transmission.

The storage unit 320 may store power usage information received from the receiving unit 310. The storage unit 320 may store power usage information by time and by the watt hour meter 200.

The calculation unit 330 may calculate the total amount of power by using the power consumption information received from the reception unit 320. Here, the summation power amount may include a combined maximum demanded power, a synthesized LP, a summed amount of power, and a synthesized power factor.

Here, the transmission direction factor may be defined according to the object to be measured by the watt hour meter 200. The object of measurement of the watt-hour meter 200 may include the power system 100, power generation facilities connected within the premises, and power reception facilities connected within the premises. This may be the case where electrical equipment is installed.

The allocation variable of the transmission direction factor may be Mn[Df], and when the measurement target of the watt hour meter 200 is the KEPCO system, the transmission direction factor may be defined as 1. That is, Mn[Df] may be 1. In addition, when the target of the watt hour meter 200 is a power generation facility connected to the premises, the transmission direction factor may be defined as 1. That is, Mn[Df] may be 1. In addition, when the object to be measured by the watt hour meter 200 is an associated power reception facility in the premises, the power transmission direction factor may be defined as 1. That is, Mn[Df] may be -1.

The power transmission direction factor may be received from the watt hour meter 200 or may be determined in advance when the watt hour meter 200 is installed.

The calculation unit 330 may calculate the total amount of power using the power consumption information received by the receiving unit 310, an LP interval, a transformer multiple, and a transmission/reception direction factor.

Specifically, the calculation unit 330 may calculate the combined power amount for one minute based on the power usage information. The 1-minute synthesized power amount may include 1 minute synthesized active power amount (P1), 1 minute synthesized ground reactive power amount (gQ1), 1 minute synthesized fast reactive power amount (dQ1), and 1 minute synthesized apparent power amount (A1).

The calculation unit 330 may calculate the synthesized effective power amount P1 for one minute through Equation 1.

[Equation 1]

Here, P1 is the combined effective power amount for one minute, Mi[Df] is the transmission direction factor according to the measurement object of each watt-hour meter 200, and Mi[Pi] is the amount of receiving effective power received from each watt-hour meter 200, Mi[Pe] is the transmission active power received from each watt-hour meter 200, Mi[Lm] is an LP interval of each watt-hour meter 200, and Mi[Tr] may be a transformer multiple of each watt-hour meter 200.

In addition, the calculation unit 330 may calculate the synthesized ground reactive power amount gQ1 for one minute through Equation 2.

[Equation 2]

Here, gQ1 is the combined amount of active power per minute, Mi[Df] is the transmission direction factor according to the measurement object of each watt hour meter 200, Mi[gQi] is the synthetic ground reactive power amount, and Mi[gQe] is the transmission ground Reactive power amount, Mi[Lm] is an LP interval of each watt hour meter 200, and Mi[Tr] may be a transformer multiple of each watt hour meter 200.

In addition, the calculation unit 330 may calculate a 1-minute combined fast reactive power amount dQ1 through Equation 3.

[Equation 3]

Here, gQ1 is the combined effective power amount per minute, Mi[Df] is the transmission direction factor according to the measurement object of each watt hour meter 200, Mi[dQi] is the combined forward reactive power amount, and Mi[dQe] is the transmission ground. Reactive power amount, Mi[Lm] is an LP interval of each watt hour meter 200, and Mi[Tr] may be a transformer multiple of each watt hour meter 200.

In addition, the calculation unit 330 may calculate the combined apparent power amount A1 for one minute through Equation 4.

[Equation 4]

Here, A1 is the synthesized apparent power amount per minute, Mi[Df] is the transmission direction factor according to the measurement object of each watt hour meter 200, Mi[Ai] is the combined apparent power amount, and Mi[Ae] is the transmission ground invalidity. Power amount, Mi[Lm] is an LP interval of each watt hour meter 200, and Mi[Tr] may be a transformer multiple of each watt hour meter 200.

Here, the LP interval may be, for example, 1 minute, but if it is not 1 minute, the precision of the corresponding variable may be sufficiently large so that an error of significant digits that may occur when the amount of power is divided by the LP interval value is minimized.

The calculation unit 330 may calculate the 15-minute synthesized power demand based on the calculated 1 minute synthesized power amount (P1, gQ1, dQ1, A1). The 15-minute synthesized power demand may include 15-minute synthesized active power (DP15) and 15-minute synthesized apparent power (DA15), and 15 minutes synthesized active power (DP15) and 15 minutes at a predetermined method or at the request of the meter reading server. At least one 15-minute combined power demand among the minute combined apparent power DA15 may be calculated. Here, the default value may be 15 minutes synthesized active power DP15.

The calculation unit 330 may calculate the 15-minute combined power demand based on the 15-minute data. That is, the calculation unit 330 may calculate the 15-minute combined power demand based on the data for the previous 15 minutes at 15 minutes, 30 minutes, 45 minutes, and 00 minutes every hour. For example, the 15 minute synthesized power demand may be calculated based on the 15 1-minute synthesized power data data from 13:16 to 13:30.

Here, the 1-minute combined active power amount data to be applied to calculate the 15-minute combined active power for each time period may be defined as P11, P12, P13, ..., P115 in an arbitrary order, and the calculation unit 330 is The 15-minute combined active power can be calculated from Equation 5.

[Equation 5]

Here, DP15 may be a 15-minute combined active power, and P1i may be a 1-minute combined active power.

In addition, here, the 1-minute combined apparent power amount data to be applied to calculate the 15-minute combined apparent power for each time period may be defined as A11, A12, A13, ..., A115 in an arbitrary order, and the calculation unit 330 The 15-minute combined apparent power can be calculated through Equation 6.

[Equation 6]

Here, DA15 may be a 15-minute combined apparent power, and A1i may be a 1-minute combined apparent power.

5, when the LP interval of the first watt-hour meter (M1) is 1 minute, the LP interval of the second watt-hour meter (M2) is 5 minutes, and the LP interval of the third watt-hour meter (M3) is 15 minutes, and An example of the amount of effective power transmitted is shown.

When the LP interval of the first watt-hour meter M1 is 1 minute, the receiving unit 310 may receive the amount of received active power from the first watt-hour meter M1 at 1-minute intervals. The amount of effective power received by the first watt hour meter M1 for 15 minutes may be 45 kWh.

In addition, when the LP interval of the second watt hour meter M2 is 5 minutes, the receiving unit 310 may receive the received effective power amount from the second watt hour meter M2 at 5 minute intervals. Here, the calculation unit 330 may calculate values every minute by receiving the received effective power amount from the second watt hour meter M2 at intervals of 5 minutes. For example, the calculation unit 330 assumes that when the received active power value between 1 minute and 5 minutes is 5 kWh, the receiving active power value for each of 1 minute, 2 minutes, 3 minutes, 4 minutes and 5 minutes is 1 kWh. Can be calculated. Here, the values every minute may be an average value of the power reception active power values received in 5 minutes. The amount of effective power received by the second watt hour meter M2 for 15 minutes may be 30 kWh.

In addition, when the LP interval of the third watt hour meter M3 is 15 minutes, the receiving unit 310 may receive the amount of effective power received from the third watt hour meter M3 at 15 minute intervals. Here, as the calculation unit 330 receives the received effective power amount from the third watt hour meter M3 at 15 minute intervals, the calculation unit 330 may calculate values every minute. For example, when the receiving active power value received between 1 minute and 15 minutes is 60 kWh, the calculation unit 330 may have a receiving active power value of 4 kWh for 1 minute, 2 minutes, 3 minutes, ..., 15 minutes. Can be calculated as Here, the values every minute may be an average value of the received active power values received in 15 minutes. The amount of effective power received by the third watt hour meter M3 for 15 minutes may be 60 kWh.

The calculation unit 330 may calculate the 15-minute synthesized power demand using the power consumption information received from the watt-hour meters (M1, M2, M3), and the 15-minute synthesized power demand calculated through Equation 6 may be 540 kWh. have. 5 is a diagram illustrating an example of calculating a 15-minute synthesized power demand according to an embodiment of the present invention.

The storage unit 320 may store the synthesized maximum power demand based on the calculated 15-minute synthesized power demand. The storage unit 320 may store the combined maximum power demand for each period of the total time zone and the time zone classification measurement (TOU).

For example, the combined maximum active power for the current month is the current combined maximum active power and the 15-minute combined active power calculated by the calculation unit 330, and the 15-minute combined active power calculated by the calculation unit 330 is the current combined maximum active power. If it is larger, the time period of the 15-minute combined active power calculated by the calculation unit 330 may be stored. At this time, the configuration for comparing the current synthesized maximum active power and the 15-minute synthesized active power calculated by the calculation unit 330 may be performed by the calculation unit 330, and the 15-minute synthesized maximum active power is the storage unit 330 Can be stored in.

In addition, the current combined maximum apparent power is compared with the current combined maximum apparent power and the 15-minute combined apparent power calculated by the calculation unit 330, and the 15-minute combined apparent power calculated by the calculation unit 330 is the current combined maximum apparent power. If it is larger, the time period of the 15-minute combined apparent power calculated by the calculation unit 330 may be stored. At this time, the configuration for comparing the current combined maximum apparent power and the 15-minute combined apparent power calculated by the calculation unit 330 may be implemented by the calculation unit 330, and the 15-minute combined maximum apparent power is the storage unit 330 Can be stored in.

When a demand return (DR) occurs due to a reason such as a meter reading, the storage unit 330 may move a value of the synthesized maximum power demand for the current month to the synthesized maximum power demand for the previous month and initialize the synthesized maximum demand power for the current month to zero. At this time, the value of the previous month may be moved to the previous month, and the previous month may be moved to the previous month.

In addition, the calculation unit 330 may calculate the synthesized LP based on the amount of synthesized power per minute. Synthetic LP is synthetic receiving active power LP, synthetic transmission active power LP, synthetic receiving ground reactive power LP, synthetic receiving and transmitting reactive power LP, synthetic receiving forward reactive power LP, synthetic transmission leading reactive power LP, synthetic transmission apparent power LP and synthesis It may include a receiving apparent power LP.

In this case, the storage unit 320 may store the synthesized LP value and the occurrence date and time calculated by the calculation unit 330. The synthesized LP may be generated and stored according to a predetermined value or a request from a meter reading server. For example, when the storage interval of the synthesized LP is 15 minutes, the storage unit 320 may store the synthesized LP every 00 minutes, 15 minutes, 30 minutes, and 45 minutes every hour.

The calculation unit 330 may calculate the combined power reception active power LP through Equation 7.

[Equation 7]

Pi15 may be the synthesized active power LP, and P1i may be the synthesized active power for one minute. At this time, the storage interval of the synthesis LP may be 15 minutes.

In addition, the calculation unit 330 may calculate the combined power transmission active power LP through Equation 8.

[Equation 8]

Pe15 may be a combined effective power of transmission LP, and P1i may be a combined amount of active power per minute. At this time, the storage interval of the synthesis LP may be 15 minutes.

The calculation unit 330 may calculate the combined power reception ground reactive power LP through Equation 9.

[Equation 9]

gQi15 may be the synthetic power reception ground reactive power LP, and gQi may be the synthetic ground reactive power amount for one minute. At this time, the storage interval of the synthesis LP may be 15 minutes.

The calculation unit 330 may calculate the synthetic transmission ground reactive power LP through Equation 10.

[Equation 10]

gQe15 may be a synthetic transmission ground reactive power LP, and gQe may be a 1-minute synthetic ground reactive power amount. At this time, the storage interval of the synthesis LP may be 15 minutes.

The calculation unit 330 may calculate the combined reception leading reactive power LP through Equation 11.

[Equation 11]

dQi15 may be the combined forward reactive power LP, and dQi may be the combined forward reactive power amount for 1 minute. At this time, the storage interval of the synthesis LP may be 15 minutes.

The calculation unit 330 may calculate the combined power transmission forward reactive power LP through Equation 12.

[Equation 12]

dQe15 may be the combined forward reactive power LP, and dQe may be the combined forward reactive power amount for 1 minute. At this time, the storage interval of the synthesis LP may be 15 minutes.

The calculation unit 330 may calculate the combined power transmission apparent power LP through Equation 13.

[Equation 13]

Ai15 is the synthetic power transmission apparent power LP, and Ai may be a 1-minute composite apparent power amount. At this time, the storage interval of the synthesis LP may be 15 minutes.

The calculation unit 330 may calculate the combined apparent power LP through Equation 14.

[Equation 14]

Ae15 may be the synthesized apparent power LP, and Ae may be the synthesized apparent power in one minute. At this time, the storage interval of the synthesis LP may be 15 minutes.

Also, the calculation unit 330 may calculate the total amount of power based on the amount of synthesized power per minute. The total amount of wattage represents the accumulated amount of combined wattage, and the summation effective power amount of reception, summation effective power amount of transmission, summation ground reactive power amount, summation transmission ground reactive power amount, summation power reception forward reactive power amount, summation power transmission forward reactive power amount, summation transmission apparent power amount, summation power reception It may include the amount of apparent power.

The calculation unit 330 may calculate the total amount of active power received through Equation 15.

[Equation 15]

Here, Pi may be the summed active power of receiving power, and P1 may be the amount of combined active power per minute. That is, the calculation unit 330 may sequentially accumulate and calculate the amount of synthesized active power per minute.

In addition, the calculation unit 330 may calculate the total amount of effective power transmitted through Equation 16.

[Equation 16]

Here, Pe is the combined effective power of transmission, and P1 may be the amount of combined active power per minute. That is, the calculation unit 330 may sequentially accumulate and calculate the amount of synthesized active power per minute. At this time, in the case of the combined power transmission active power, since it is power transmission, not the reception, the amount of power used by the customer 400 can be accurately calculated by subtracting it from the value of the combined reception active power.

In addition, the calculation unit 330 may calculate the summed amount of ground reactive power received from the ground through Equation 17.

[Equation 17]

Here, gQi may be the summed power receiving ground reactive power, and gQ1 may be the combined amount of ground reactive power for one minute. That is, the calculation unit 330 may sequentially accumulate and calculate the amount of ground reactive power for one minute.

In addition, the calculation unit 330 may calculate the total amount of transmission ground reactive power through Equation 18.

[Equation 18]

Here, gQe may be a summed transmission ground reactive power, and gQ1 may be a 1-minute combined ground reactive power amount. That is, the calculation unit 330 may sequentially accumulate and calculate the amount of ground reactive power for one minute. In this case, since the summation transmission ground reactive power is transmission, not the reception, the amount of power used by the customer 400 can be accurately calculated by subtracting it from the value of the summation transmission ground reactive power.

In addition, the calculation unit 330 may calculate the summed power receiving forward reactive power amount through Equation 19.

[Equation 19]

Here, dQi may be the summed forward reactive power, and dQ1 may be the combined forward reactive power amount for one minute. That is, the calculation unit 330 may sequentially accumulate and calculate the amount of reactive power that is synthesized for one minute.

In addition, the calculation unit 330 may calculate the amount of total power transmission forward reactive power through Equation 20.

[Equation 20]

Here, dQe may be the summed power transmission forward reactive power, and dQ1 may be the combined forward reactive power amount for one minute. That is, the calculation unit 330 may sequentially accumulate and calculate the amount of reactive power that is synthesized for one minute. At this time, in the case of the summation transmission forward reactive power, since it is transmission, not the reception, the amount of power used by the customer 400 can be accurately calculated by subtracting it from the value of the summation transmission forward reactive power.

In addition, the calculation unit 330 may calculate the total amount of apparent power transmitted through Equation 21.

[Equation 21]

Here, Ai may be the summed apparent power transmission, and A1 may be the combined amount of apparent power per minute. That is, the calculation unit 330 may sequentially accumulate and calculate the amount of combined apparent power per minute.

In addition, the calculation unit 330 may calculate the summed apparent power amount received through Equation 22.

[Equation 22]

Here, Ae may be the summed apparent power received, and A1 may be the combined amount of apparent power per minute. That is, the calculation unit 330 may sequentially accumulate and calculate the amount of combined apparent power per minute.

The storage unit 320 may record the total amount of total power and record the meter reading values for the current month and the previous 12 months according to the meter reading function defined in the same purchase standard.

In addition, the calculation unit 330 may calculate a 30-minute composite power factor. The 30-minute composite power factor can be calculated using the receiving active power LP, the receiving ground reactive power LP, and the receiving forward reactive power LP among the synthesis LPs. In this case, the calculation unit 330 may calculate the composite power factor only once every 30 minutes in order not to calculate duplicate values. That is, the power consumption information received through the receiving unit 310 in the first 15 minutes is stored without calculating the power factor, and when the power consumption information is received through the receiving unit 310 in the next 15 minutes, it is received in the previous 15 minutes. The power factor can be calculated by combining the stored power usage information and the currently received power usage information. For example, when the wattage measurement device 300 collects information of the watt hour meter 200 in units of 15 minutes for a time period from 00:00 to 01:00, 00:15 data is stored in the storage unit 320, and the calculation unit ( In 330), the 30-minute composite power factor can be calculated by combining the data at 00:30 with the data at 00:15.

Here, the calculation unit 330 may calculate the ground power factor, and the ground power factor may be calculated through Equation 23.

Here, gPf30 may be a ground power factor, Pi30 may be a 30-minute synthetic power reception effective power amount, and gQi30 may be a 30-minute synthetic reception ground reactive power amount.

In addition, the calculation unit 330 may calculate the leading power factor, and the leading power factor may be calculated through Equation 24.

Here, dPf30 may be a leading power factor, Pi30 may be a 30-minute combined reception active power, and dQi30 may be a 30-minute combined reception leading reactive power amount.

The calculation unit 330 may calculate the 1-month composite power factor by calculating the daytime ground power factor and the late-night time true power factor using the 30-minute composite power factor, and the storage unit 320 may calculate the 30-minute composite power factor, the daytime ground power factor and It is possible to store the current month value and the previous 12 month value of the true power factor in the late night time zone.

The calculation unit 330 may calculate an adjusted power factor to calculate a one-month composite power factor. The adjusted ground power factor can be calculated as follows.

gPf30adj=max(0.6, min(0.95, round(gPf30, 2))

gPf30adj is the adjusted ground power factor, and it can be limited to 95% if the 30-minute composite ground power factor value is greater than 95%, and to 60% if it is less than 60%.

In addition, the adjusted leading power factor can be calculated as follows.

dPf30adj=max(0.6, min(0.95, round(dPf30, 2))

dPf30adj is an adjusted leading power factor, and when the 30-minute combined leading power factor value is less than 60%, it can be limited to 60%, and when it exceeds 95%, it may not be adjusted.

Accordingly, the daytime ground power factor gPFday may be a one-month average value of gPf30adj. Here, the weekly time zone means a time from 09:00 to 23:00, and may be 09:00 <weekly time zone ≤ 23:00.

On the other hand, the true power factor (dPFnight) in the midnight time may be an average value of dPf30adj for one month. Here, the late-night time zone means a time from 23:00 to 09:00, and may be 09:00 ≥ a late-night time zone or a late-night time zone> 23:00.

As described above, according to an embodiment of the present invention, even when distributed power is connected, the total amount of wattage of a plurality of watt-hour meters can be calculated. It is possible to realize an wattage measuring device for measuring the total amount of wattage of a plurality of watthour meters.

Those skilled in the art to which the present invention pertains, since the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof, the embodiments described above are illustrative in all respects and should be understood as non-limiting. Only do it. The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

100: power system
200: watt hour meter
300: wattage measuring device
310: receiver
320: storage unit
330: calculation unit

Claims (19)

A receiver configured to receive power usage information, LP intervals, and transformer multiples of each of the plurality of watt-hour meters at regular intervals from a plurality of watt-hour meters;
A storage unit for storing power usage information received by the receiving unit;
Including, a power amount measuring device for measuring the total amount of power of a plurality of watt-hour meters, including; a calculation unit that calculates the total amount of power by using the power consumption information.
The method of claim 1,
The power consumption information is the total amount of wattage of a plurality of wattmeters, including the amount of active power received, the amount of reactive power received from the ground, the amount of reactive power received from the ground, the amount of apparent power received, the amount of active power transmitted, the amount of reactive power received from the forward, the amount of reactive power from the ground and the amount of apparent power transmitted. Electric energy measurement device for measuring the power.
The method of claim 1,
The calculation unit calculates a 1-minute synthesized power amount based on the power usage information, and the 1-minute synthesized power amount includes a 1-minute synthesized active power amount, a 1-minute synthesized ground reactive power amount, 1 minute synthesized fast reactive power amount, and 1 minute synthesized apparent power amount. An electric energy measurement device for measuring the sum of electric energy of a plurality of electric energy meters.
The method of claim 3,
The calculation unit calculates the amount of synthesized active power for one minute through Equation 1,
[Equation 1]

P1 is the total amount of effective power for one minute, Mi[Df] is the factor of the direction of transmission and reception according to the measurement object of each watt-hour meter, Mi[Pi] is the amount of receiving effective power received from each watt-hour meter, and Mi[Pe] is from each watt-hour meter. An wattage measuring device for measuring the total amount of wattage of a plurality of watt-hour meters, which is the received transmission active power, Mi[Lm] is the LP interval of each watt-hour meter, and Mi[Tr] is the transformer multiple of each watt-hour meter.
The method of claim 3,
The calculation unit calculates the amount of ground reactive power for one minute through Equation 2,
[Equation 2]

gQ1 is the total amount of active power per minute, Mi[Df] is the transmission direction factor according to the measurement object of each watt-hour meter, Mi[gQi] is the synthetic ground reactive power, Mi[gQe] is the transmission ground reactive power, Mi [Lm] is the LP interval of each watt-hour meter, and Mi[Tr] is a transformer multiple of each watt-hour meter 200, an watt-hour measurement device for measuring the total amount of wattage of a plurality of watt-hour meters.
The method of claim 3,
The calculation unit calculates the amount of synthesized true reactive power for 1 minute through Equation 3,
[Equation 3]

gQ1 is the synthesized active power per minute, Mi[Df] is the transmission direction factor according to the measurement object of each watt-hour meter, Mi[dQi] is the combined forward reactive power, Mi[dQe] is the transmission ground reactive power, Mi [Lm] is the LP interval of each watt-hour meter, and Mi[Tr] is the transformer multiple of each watt-hour meter, a watt-hour measurement device for measuring the total amount of wattage of a plurality of watt-hour meters.
The method of claim 3,
The calculation unit calculates the amount of combined apparent power for 1 minute through Equation 4,
[Equation 4]

A1 is the synthesized apparent power amount per minute, Mi[Df] is the transmission direction factor according to the measurement object of each watt-hour meter, Mi[Ai] is the combined apparent power, Mi[Ae] is the amount of ground reactive power for transmission, and Mi[ Lm] is the LP interval of each watt-hour meter, and Mi[Tr] is the transformer multiple of each watt-hour meter.
The method of claim 3,
The calculation unit calculates the combined power demand for 15 minutes based on the calculated amount of combined power for 1 minute, and the combined power demand for 15 minutes measures the total amount of power of a plurality of wattmeters, including the combined active power of 15 minutes and the combined apparent power of 15 minutes. Electric energy measuring device for measuring.
The method of claim 8,
The calculation unit calculates the combined active power for 15 minutes through Equation 5, and calculates the combined apparent power for 15 minutes through Equation 6,
[Equation 5]

[Equation 6]

DP15 is the combined active power for 15 minutes, P1i is the combined active power for 1 minute,
DA15 is a 15-minute combined apparent power, and A1i is a 1-minute combined apparent power, an watt-hour measuring device for measuring the combined wattage of a plurality of watt-hour meters.
The method of claim 3,
The calculation unit calculates the synthesized LP based on the calculated amount of synthesized power per minute, and the synthesized LP is the synthesized power reception active power LP, the synthesized transmission active power LP, the synthesized power reception ground reactive power LP, the synthesized reception transmission reactive power LP, and the synthesized power reception. A power quantity measuring device for measuring the total amount of power of a plurality of watt-hour meters, including leading reactive power LP, combined power transmission fast reactive power LP, combined power transmission apparent power LP, and combined power reception apparent power LP.
The method of claim 10,
The calculation unit calculates the synthesized power reception active power LP through Equation 7 and calculates the synthesized power transmission active power LP through Equation 8,
[Equation 7]

[Equation 8]

Pi15 is the combined active power LP, Pe15 is the combined active power LP, P1i is the combined active power for 1 minute, and the storage interval of the combined LP is 15 minutes, an wattage measuring device for measuring the total amount of wattage of a plurality of wattmeters.
The method of claim 10,
The calculation unit calculates the synthesized power transmission ground reactive power LP through Equation 9, and calculates the synthesized transmission ground reactive power LP through Equation 10,
[Equation 9]

[Equation 10]

gQi15 is the synthetic power reception ground reactive power LP, gQe15 is the synthetic power transmission ground reactive power LP, gQe is the 1-minute synthetic ground reactive power quantity, and the combined power quantity for measuring the total power quantity of a plurality of watt-hour meters with a storage interval of 15 minutes of the synthesis LP Instrumentation device.
The method of claim 10,
The calculation unit calculates the combined power receiving forward reactive power LP through Equation 11, and calculates the synthesized power transmitting forward reactive power LP through Equation 12,
[Equation 11]

[Equation 12]

dQi15 is the composite receiving forward reactive power LP, dQe15 is the composite receiving forward reactive power LP, dQe is the 1-minute composite forward reactive power, and the amount of power used to measure the total amount of power of multiple wattmeters with a storage interval of 15 minutes for the composite LP. Instrumentation device.
The method of claim 10,
The calculation unit calculates the combined power transmission apparent power LP through Equation 13, and calculates the combined power reception apparent power LP through Equation 14,
[Equation 13]

[Equation 14]

Ai15 is the composite power transmission apparent power LP, Ae15 is the composite power reception apparent power LP, Ae is the composite apparent power amount for one minute, and the storage interval of the composite LP is 15 minutes.
The method of claim 3,
The calculation unit calculates the total amount of wattage based on the total amount of power per minute, and the total amount of power is the total amount of power received from the power supply, the amount of active power in transmission, the amount of ground reactive power in the receiving area, the amount of ground reactive power for transmission, the amount of ground reactive power for the total transmission, the amount of reactive power in the total receiving power, and the total amount of transmission power. An electric energy measuring device for measuring the sum of electric power of a plurality of electric power meters, including the amount of reactive electric power, the total amount of power transmission and apparent electric power, and the amount of apparent electric power received.
The method of claim 15,
The calculation unit calculates the total amount of effective power received through Equation 15, and the calculation unit calculates the total amount of transmission effective power through Equation 16,
[Equation 15]

[Equation 16]

An wattage measuring device for measuring the combined wattage of a plurality of watt-hour meters, where Pi is the summed active power of receiving and receiving, Pe is the summed active power of transmission, and P1 is the amount of combined active power per minute.
The method of claim 15,
The calculation unit calculates the summed amount of ground reactive power for receiving power through Equation 17, and calculates the summed amount of transmission ground reactive power through Equation 18,
[Equation 17]

[Equation 18]

gQi is the summed ground reactive power for receiving and receiving, gQe is the summed ground reactive power for transmission, and gQ1 is the total amount of ground reactive power for one minute.
The method of claim 15,
The calculation unit calculates the summed power-receiving forward reactive power amount through Equation 19, and calculates the summed power transmission forward reactive power amount through Equation 20,
[Equation 19]

[Equation 20]

dQi is the summation receiving forward reactive power, dQe is the summation transmittance forward reactive power, and dQ1 is the combined forward reactive power amount of one minute, an wattage measuring device for measuring the total amount of wattage of a plurality of wattmeters.
The method of claim 15,
The calculation unit calculates the combined amount of transmission apparent power through Equation 21, and calculates the summed amount of power reception through Equation 22,
[Equation 21]

[Equation 22]

Ai is the summed power transmission apparent power, Ae is the summation apparent power received, and A1 is the summed amount of power in one minute, a wattage measuring device for measuring the summed amount of wattage of a plurality of watt-hour meters.

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