JP2020141490A - Connection phase estimation device, connection phase estimation program, and connection phase estimation method - Google Patents

Abstract

To accurately estimate a connection phase of a power generation device even if not only a low voltage demand customer but also a high voltage demand customer are supplied with power from a power distribution network.SOLUTION: A connection phase estimation device is configured to: acquire substation current data indicating a current of each phase of three-phase alternating current output from a substation and effective power data indicating effective power consumed by a low voltage demand customer group; calculate a first total current that is a sum of currents of each phase of the three-phase alternating current supplied to the high voltage demand consumer group, based on a current of each phase of the three-phase alternating current and the effective power indicated by the substation current data; calculate a current of each phase, that is a current of each phase of the three-phase alternating current supplied to the low voltage demand customer group, converted into a voltage of the three-phase current supplied to the high voltage demand customer group, based on a current of each phase of the three-phase alternating current and the first total current indicated by the substation current data; and estimate to which a power generation device of a low voltage demand customer is connected, a first distribution line, a second distribution line, and a third distribution line where a three-phase alternating current output from the substation flows, based on correlation between the current of each phase and effective power.SELECTED DRAWING: Figure 2

Description

The present invention relates to a connection phase estimation device, a connection phase estimation program, and a connection phase estimation method.

In recent years, the installation of power generation devices such as solar panels has increased. In the three-phase three-wire distribution line, each facility is connected so that the first-phase current, the second-phase current, and the third-phase current are in equilibrium with each other. Such a state is called three-phase equilibrium.

However, when the power generation device is biased to a specific phase of these three phases and reverse tide is applied from the power generation device to the distribution line, the current of the first phase, the current of the second phase, and the current of the third phase The currents may not be in equilibrium with each other. Such a state is called a three-phase imbalance. When voltage imbalance occurs due to three-phase imbalance, the equipment of the consumer who receives power from the distribution line may break down.

For this reason, the electric power company needs to manage the connection phase of the power generation device in order to avoid a situation in which voltage imbalance occurs. On the other hand, since the number of power generation devices is enormous and the distribution lines may be twisted, it is very difficult for field workers to visually check the connection phases of the power generation devices one by one. .. Under these circumstances, the amount of power used by each consumer measured by a smart meter, which is rapidly becoming widespread, and the current of the first phase and second phase of three-phase AC measured by a switch with a built-in sensor. A technique for determining the connection phase of a power generation device has been developed by analyzing the correlation between the current and the current of the third phase. As an example of such a technique, for example, the connection phase estimation device described in Patent Document 1 can be mentioned.

This connection phase estimation device includes a calculation unit and a determination unit. The calculation unit is the amount of electric power measured by the measuring device under the second distribution line connected to any two of the three or more first distribution lines, and the line current of the first distribution line of three or more. The correlation evaluation value with each of the above is calculated by applying the amount of suppression according to the magnitude of the spectrum of each frequency component to the correlation value between the amount of power and the line current in each frequency component. The determination unit determines the connection phase of the second distribution line based on the plurality of correlation evaluation values calculated by the calculation unit.

JP-A-2017-32357

However, since this connection phase estimation device does not consider the influence of the high-voltage consumer, the determination of the connection phase of the power generation device may be erroneous when the high-voltage consumer exists.

Therefore, the present invention is a connection phase estimation device and a connection phase estimation program that can accurately estimate the connection phase of a power generation device even if not only the low-voltage consumer but also the high-voltage consumer is supplied with electric power from the distribution network. An object of the present invention is to provide a method for estimating the connection phase.

One aspect of the present invention is the supply of three-phase AC from the substation and the substation current data indicating each of the three-phase AC first-phase current, second-phase current, and third-phase current output by the substation. A data acquisition unit that acquires active power data indicating the active power consumed by the low-voltage consumer group receiving the power, and the three-phase AC first-phase current, second-phase current, and first phase indicated by the substation current data. Based on the three-phase current and the active power indicated by the active power data, the first-phase current, the second-phase current, and the third-phase of the three-phase AC supplied from the substation to the high-voltage consumer group. The first total current, which is the total of the currents of the above, is calculated, and the first phase current, the second phase current, the third phase current, and the first total current of the three-phase AC shown by the substation current data are calculated. Based on the above, the three-phase AC first-phase current, second-phase current, and third-phase current supplied to the high-pressure consumer group, which are supplied to the high-pressure consumer group. A current calculation unit that calculates the first-phase current, second-phase current, and third-phase current converted to phase-AC voltage, and the first-phase current and second phase calculated by the current calculation unit. Based on the correlation between each of the phase current and the third phase current and the active power indicated by the active power data, the first distribution wire through which the first phase current of the three-phase AC output by the substation flows. A connection phase that estimates which of the second distribution wire through which two-phase current flows and the third distribution wire through which three-phase current flows is connected to the power generation equipment of the low-voltage consumers included in the low-voltage consumer group. It is a connection phase estimation device including an estimation unit.

Another aspect of the present invention is that in the connection phase estimation device, the current calculation unit uses the three-phase AC first-phase current, second-phase current, and third-phase current indicated by the substation current data. By subtracting the current obtained by multiplying the first total current by a predetermined ratio from each, the first phase current, the second phase current, and the third phase current of the three-phase AC supplied to the low-voltage consumer group are subtracted. The first-phase current, the second-phase current, and the third-phase current, which are the phase currents and are converted into the three-phase AC voltage supplied to the high-pressure consumer group, are calculated.

Another aspect of the present invention is that in the connection phase estimation device, the current calculation unit uses the substation current data to indicate the three-phase AC first-phase current, second-phase current, and third-phase current. The low-voltage consumer is obtained by subtracting the first total current from each of the three-phase AC first-phase current, second-phase current, and third-phase current output by the substation. The first-phase current, second-phase current, and third-phase current of the three-phase AC supplied to the group, which are converted into the three-phase AC voltage supplied to the high-voltage consumer group. Calculate the current of the first phase, the current of the second phase, and the current of the third phase.

One aspect of the present invention is to provide a computer with substation current data indicating each of the three-phase AC first-phase current, second-phase current, and third-phase current output by the substation, and three-phase from the substation. A data acquisition function that acquires active power data indicating the active power consumed by a group of low-voltage consumers who are supplied with AC, and the three-phase AC first-phase current and second-phase current shown by the substation current data. Based on the current and the current of the third phase and the active power indicated by the active power data, the current of the first phase of the three-phase AC, the current of the second phase, and the current of the second phase supplied from the substation to the high-voltage consumer group. The first total current, which is the total of the currents of the third phase, is calculated, and each of the first phase current, the second phase current, and the third phase current of the three-phase AC shown by the substation current data and the first phase are described. Based on the total current, the three-phase AC first-phase current, second-phase current, and third-phase current supplied to the high-pressure consumer group are supplied to the high-pressure consumer group. A current calculation function that calculates the first-phase current, second-phase current, and third-phase current converted to the three-phase AC voltage, and the first-phase current calculated by the current calculation function. , The first arrangement in which the current of the first phase of the three-phase AC output by the substation flows based on the correlation between each of the current of the second phase and the current of the third phase and the active power indicated by the active power data. It is estimated which of the electric wire, the second distribution electric wire through which the second phase current flows, and the third distribution electric wire through which the third phase current flows is connected to the power generation device owned by the low pressure consumer included in the low pressure consumer group. It is a connection phase estimation program for realizing the connection phase estimation function.

One aspect of the present invention is the supply of three-phase AC from the substation and the substation current data indicating each of the three-phase AC first-phase current, second-phase current, and third-phase current output by the substation. The data acquisition process for acquiring active power data indicating the active power consumed by the low-voltage consumer group receiving the power, and the three-phase AC first-phase current, second-phase current, and first phase indicated by the substation current data. Based on the three-phase current and the active power indicated by the active power data, the first-phase current, the second-phase current, and the third-phase of the three-phase AC supplied from the substation to the high-voltage consumer group. The first total current, which is the total of the currents of the above, is calculated, and the first phase current, the second phase current, the third phase current, and the first total current of the three-phase AC shown by the substation current data are calculated. Based on the above, the three-phase AC first-phase current, second-phase current, and third-phase current supplied to the high-pressure consumer group, which are supplied to the high-pressure consumer group. A current calculation step for calculating the first phase current, the second phase current, and the third phase current converted to the phase AC voltage, and the first phase current calculated in the current calculation step, the second phase. Based on the correlation between each of the phase current and the third phase current and the active power indicated by the active power data, the first distribution wire through which the first phase current of the three-phase AC output by the substation flows. A connection phase that estimates which of the second distribution wire through which two-phase current flows and the third distribution wire through which three-phase current flows is connected to the power generation equipment of the low-voltage consumers included in the low-voltage consumer group. It is a connection phase estimation method including an estimation step.

According to the present invention, not only the low-voltage consumer but also the high-voltage consumer can accurately estimate the connection phase of the power generation device even if the power is supplied from the distribution network.

It is a figure which shows an example of the distribution network which concerns on embodiment. It is a figure which shows an example of the functional structure of the connection phase estimation apparatus which concerns on embodiment. The first-phase current, the second-phase current, and the third-phase current of the three-phase AC output by the substation according to the embodiment, and the first-phase current of the three-phase AC supplied to the high-voltage consumer group. To explain the relationship between the second-phase current and the third-phase current and the three-phase AC first-phase current, second-phase current, and third-phase current supplied to the low-voltage consumer group. It is a figure. It is a figure which shows an example of the correlation between each of the 1st phase current, the 2nd phase current and the 3rd phase current calculated by the connection phase estimation apparatus which concerns on embodiment, and the active power shown by active power data. It is a flowchart which shows an example of the process executed by the connection phase estimation apparatus which concerns on embodiment.

An example of the connection phase estimation device according to the embodiment will be described with reference to FIGS. 1 to 4.

First, an example of a power distribution network to which the connection phase estimation device according to the embodiment is applied will be described with reference to FIG. FIG. 1 is a diagram showing an example of a power distribution network according to an embodiment. As shown in FIG. 1, the distribution network 1 includes a substation 2, a first distribution line 31, a second distribution line 32, a third distribution line 33, a high-voltage consumer group 4, and a low-voltage consumer group 5. And the switch 6.

The substation 2 converts the three-phase AC voltage transmitted from the power plant via the transmission line to a predetermined voltage, for example, 6600V, and converts the first distribution line 31, the second distribution line 32, and the third distribution line. This is a facility that allows three-phase AC to flow through the electric line 33.

The first distribution line 31, the second distribution line 32, and the third distribution line 33 are overhead distribution lines that are overheaded on utility poles or underground distribution lines that are buried underground. The first distribution line 31 carries the current of the first phase of the three-phase alternating current flowed by the substation 2. Similarly, the second distribution line 32 carries the second phase current of the three-phase alternating current flowed by the substation 2. Further, the third distribution line 33 carries a three-phase alternating current of the third phase, which is passed by the substation 2.

The high-voltage consumer group 4 includes high-voltage consumers 41, ..., And high-voltage consumers 4k (k: a natural number of 2 or more). High-voltage consumer 41, ..., High-voltage consumer 4k has equipment connected to the first distribution line 31, the second distribution line 32, and the third distribution line 33, and desires three-phase power received at 6600V. It is a consumer who converts it to the voltage of. High-voltage consumers 41, ..., High-voltage consumers 4k include, for example, factories and large-scale condominiums.

The low-pressure consumer group 5 includes low-pressure consumers 51, ..., Low-pressure consumers 5k (k: a natural number of 2 or more). The low-voltage consumer 51, ..., The low-voltage consumer 5k has equipment connected to the first distribution line 31, the second distribution line 32, or the third distribution line 33, and has a three-phase electric power of 6600V. It is a consumer who uses the power converted into 200V single-phase power or 100V single-phase power by the upper transformer. Examples of the low-pressure consumer 51, ..., The low-pressure consumer 5k include ordinary households.

Further, as shown in FIG. 1, the low-voltage consumer 51, ..., And the low-voltage consumer 5k have smart meters 511, ..., Smart meters 51k, power generation devices 521, ..., And power generation devices 52k, respectively. The smart meter 511, ..., The smart meter 51k has a communication function, and transmits digitally measured data of the electric energy used by each of the low-voltage consumer 51, ..., and the low-voltage consumer 5k to an electric power company or the like. .. The power generation device 521, ..., The power generation device 52k is, for example, a distributed power source such as a solar panel, and the power generated by itself is used as any one of the first distribution line 31, the second distribution line 32, and the third distribution line 33. The tide goes backwards. It should be noted that at least one of the low-voltage consumer 51, ..., And the low-voltage consumer 5k may not have the power generation device 521, ..., And the power generation device 52k, respectively.

The switch 6 has a case where three-phase AC is passed through the first distribution line 31, the second distribution line 32 and the third distribution line 33, and three in the first distribution line 31, the second distribution line 32 and the third distribution line 33. It is a switch that switches between the case where phase AC does not flow and the case where it does not flow. Further, the switch 6 includes an ammeter that measures each of the three-phase AC first-phase current, second-phase current, and third-phase current flowing through the substation 2. This ammeter measures, for example, the first phase current, the second phase current, and the third phase current for 30 minutes.

Next, the connection phase estimation device according to the embodiment will be described with reference to FIGS. 2 to 4. FIG. 2 is a diagram showing an example of a functional configuration of the connection phase estimation device according to the embodiment. FIG. 3 shows the first-phase current, the second-phase current, and the third-phase current of the three-phase AC output by the substation according to the embodiment, and the first of the three-phase AC supplied to the high-voltage consumer group. The relationship between the phase current, the second phase current, and the third phase current, and the first phase current, the second phase current, and the third phase current of the three-phase AC supplied to the low-voltage consumer group. It is a figure for demonstrating.

In the following description, the first-phase current I _u , the second-phase current I _v, and the third-phase current I _w of the three-phase AC output from the substation, and the three-phase supplied to the high-voltage consumer group 4 The AC first-phase current I _uH , the second-phase current I _vH, and the third-phase current I _ww, and the three-phase AC first-phase current I _uL supplied to the low-voltage consumer group 5. A phase current I _vL and a third phase current I _wL are used. As will be described later, the first-phase current I _uL , the second-phase current I _vL, and the third-phase current I _wL are converted into the three-phase AC voltage supplied to the high-voltage consumer group 4. Is the current. Further, these nine currents indicate, for example, the currents in 30 minutes, and change with the passage of time.

Further, the sum of the first phase current I _u , the second phase current I _v, and the third phase current I _w of the three-phase alternating current output by the substation is defined as the substation current I. The total of the first phase current I _uH , the second phase current I _vH, and the third phase current I _wH of the three-phase alternating current supplied to the high-voltage consumer group 4 is _defined as the first total current I _H. The first phase of the current I _uL of the three-phase alternating current supplied to the low-pressure customer group _5, the sum of the second phase of the current I _vL and third phase of the current I _wL and second total current I _L. Between the substation current I and the first total current I _H and the second sum current I _L, the relationship is established as represented by the following formula (1). It can be understood that the equation (1) holds in consideration of the connection relationship between the substation 2 shown in FIG. 1, the high-voltage consumer group 4, and the low-voltage consumer group 5.

Further, as shown in FIG. 3, the current I _u of the first phase of the three-phase alternating current substation output, the current I _uH first phase of the three-phase alternating current supplied to the high-pressure customer group 4, the low-pressure The relationship represented by the following equation (2) is established with the current _IuL of the first phase of the three-phase alternating current supplied to the consumer group 5.

Further, for the second phase and the third phase, the same relationship as that of the equation (2), that is, the relationship expressed by each of the following equations (3) and (4) is established.

Further, in the following description, the active power consumed by the low-voltage consumer group 5, that is, the low-voltage consumer 51, ..., The active power P which is the active power consumed by the low-voltage consumer 5k is used.

As shown in FIG. 2, the connection phase estimation device 7 includes a data acquisition unit 71, a current calculation unit 72, and a connection phase estimation unit 73.

The data acquisition unit 71 acquires substation current data, data, and active power data.

The substation current data is data indicating each of the three-phase AC first-phase current I _u , the second-phase current I _v, and the third-phase current I _w output by the substation 2. The data acquisition unit 71 acquires the substation current data from, for example, a storage medium installed at an arbitrary location or an ammeter included in the switch 6 shown in FIG. 1 for storing the substation current data.

The active power data is data showing the active power P, which is the active power consumed by the low-voltage consumer group 5 receiving the supply of three-phase AC from the substation 2. The active power P is, for example, time-series data of the total active power consumed by each of the low-voltage consumer 51, ..., And the low-voltage consumer 5k every 30 minutes. The data acquisition unit 71 acquires the active power data by calculating the active power P from the electric energy digitally measured by each of the smart meter 511, ..., And the smart meter 51k shown in FIG. 1, for example. Alternatively, the data acquisition unit 71 may store the active power data and acquire the active power data from a storage medium installed at an arbitrary location.

Current calculator 72, the current I _u of the first phase of the three-phase alternating current indicated by the substation current data _and to the active power P indicated by the second phase of the current I _v and the current I _w and the effective power data of the third phase Based on this, the first is the sum of the first phase current I _uH , the second phase current I _vH, and the third phase current I _wH of the three-phase AC supplied from the substation 2 to the high-voltage consumer group 4. Calculate the total current I _H. Specifically, the current calculation unit 72 calculates the first total current I _H using the following equation (5). The value of V included in the second term of the formula (5) is a three-phase alternating current voltage of 6600 V supplied to each of the high-voltage consumer 41, ..., And the high-voltage consumer 4k. Further, the active power P included in the second term of the equation (5) is an active power calculated from the total amount of electric power used by each of the low-voltage consumer 51, ..., And the low-voltage consumer 5k for 30 minutes. These electric energies are measured by smart meters 511, ..., And smart meters 51k, respectively. Further, "2" included in the second term of the formula (5) is the total amount of power used for 30 minutes by the active power P included in the second term of the formula (5) for one hour. It is a count for converting to a total.

Then, the current calculation unit 72 sets the current I _u of the first phase of the three-phase AC, the current I _v of the second phase, the current I _w of the third phase, and the first total current I _H indicated by the current data of the substation. based on, calculates a first phase current I _uL, second phase of the current I _vL and third phase current I _wL of the three-phase AC which is supplied to the low-pressure customer group 5.

For example, the current calculation unit 72 converts each of the three-phase AC first-phase current I _u , second-phase current I _v, and third-phase current I _w indicated by the substation current data into the first total current I _H. Subtract the current obtained by multiplying by a predetermined ratio. Thus, a current calculation unit 72 calculates a first phase current I _uL of a three-phase alternating current is supplied to the low-pressure customer group _5, the second phase of the current I _vL and third phase current I _wL. Specifically, the current calculation unit 72 uses the following equations (6), (7) and (8) to obtain the first phase current I _uL , the second phase current I _vL and the third phase current. The current I _{wL of} is calculated. In the formula (6), the formula (7) and the formula (8), 1/3 is adopted as a predetermined ratio. However, the predetermined ratio is not limited to this, and may be a ratio in which various corrections and the like are taken into consideration.

Further, the first-phase current I _uL , the second-phase current I _vL, and the third-phase current I _wL calculated by the equations (6), (7), and (8) are the high-voltage consumer group. It is the current converted to the voltage of the three-phase alternating current supplied to.

However, in the current calculation unit 72, the current I _uH of the first phase of the three-phase alternating current supplied to the high-voltage consumer group 4, the current I _vH of the second phase, and the current I _{wH of} the third phase are balanced. The equations (6), (7) and (8) are used when it can be considered that the following equation (9) is satisfied.

Alternatively, the current calculation unit 72 calculates the first total current I _H from each of the three-phase AC first-phase current I _u , the second-phase current I _v, and the third-phase current I _w indicated by the substation current data. Subtract each of the currents proportionally divided by the first phase current I _u , the second phase current I _v, and the third phase current I _w of the three-phase AC output from the substation 2. Thus, a current calculation unit 72 calculates a first phase current I _uL of a three-phase alternating current is supplied to the low-pressure customer group _5, the second phase of the current I _vL and third phase current I _wL.

For example, the current calculation unit 72 uses the following equations (10), (11) and (12) to supply the three-phase alternating current first-phase current _IuH to the high-voltage consumer group 4. The current I _vH of the second phase and the current I _wH of the third phase are calculated.

Alternatively, the current calculation unit 72 uses the following equations (13), (14) and (15) to supply the three-phase alternating current first-phase current _IuH , which is supplied to the high-voltage consumer group 4. The current I _vH of the second phase and the current I _wH of the third phase are calculated.

Then, the current calculation unit 72 calculates the current I _{uH of} the first phase, the current I _vH of the second phase, and the current I of the third phase calculated using the equations (10), (11), and (12). _{Substituting wH} into each of the following equations (16), (17) and (18), the three-phase AC first-phase current _IuL and second-phase current supplied to the low-pressure consumer group 5 _Calculate I _vL and the current I _wL of the third phase. Alternatively, the current calculation unit 72 may use the equations (13), (14) and (15) to calculate the first phase current I _uH , the second phase current I _vH and the third phase current I. _{Substituting wH} into each of the following equations (16), (17) and (18), the three-phase AC first-phase current _IuL and second-phase current supplied to the low-pressure consumer group 5 _Calculate I _vL and the current I _wL of the third phase.

The first-phase current I _uL , the second-phase current I _vL, and the third-phase current I _wL calculated by these methods are converted into the three-phase AC voltage supplied to the high-voltage consumer group. Is the current.

The current calculation unit 72 has the equation (10), the equation (11) and the equation regardless of whether the above equation (9) is considered to hold or is not considered to hold. Calculations using (12) and calculations using equations (13), (14) and (15) may be performed.

The connection phase estimation unit 73 includes the first phase current I _uL , the second phase current I _vL, and the third phase current I _wL calculated by the current calculation unit 72, and the active power P indicated by the active power data. The connection phase estimation process is executed based on the correlation of. The connection phase estimation process is performed on the first distribution line 31 through which the first-phase current _Iu of the three-phase AC output from the substation 2 flows, the second distribution line 32 through which the second-phase current _Iv flows, and the third phase. This is a process of estimating which of the third distribution line 33 through which the current I _w flows is connected to the power generation device 521, ..., And the power generation device 52k.

FIG. 4 shows an example of the correlation between each of the first phase current, the second phase current, and the third phase current calculated by the connection phase estimation device according to the embodiment and the active power indicated by the active power data. It is a figure. FIG. 4 shows an example in which the correlation between the current _IuL of the first phase and the active power P is relatively small with reference to FIG. 4A. 4 (b) and FIG. 4 _show an example in which the correlation between the second phase current I _vL and the active power P and the correlation between the third phase current I _wL and the active power P are relatively large. It is shown by 4 (c). In such a case, the connection phase estimation unit 73 estimates that the power generation device 521, ..., Or the power generation device 52k is connected to the current I _vL of the second phase and the current I _wL of the third phase.

Specifically, the connection phase estimation unit 73 executes the connection phase estimation process by, for example, the method described below.

The connection phase estimation unit 73 sets the three-phase alternating current I _uL , the second phase current I _vL, the third phase current I _wL, and the active power P, which are supplied to the low-voltage consumer group 5. On the other hand, the division and overlap are set, and the division data is extracted. The purpose of this process is to enable frequency decomposition by Fast Fourier Transform (FFT) and to secure the number of evaluation samples.

The connection phase estimation unit 73 applies a fast Fourier transform to the first phase current I _uL , the second phase current I _vL, the third phase current I _wL, and the active power P to calculate the spectrum for each division data. To execute. Further, in this case, each spectrum is smoothed by taking the average of each division. In these processes, the correlation between each of the first phase current I _uL , the second phase current I _vL, and the third phase current I _wL calculated by the current calculation unit 72 and the active power P indicated by the active power data. The purpose is to make it possible to calculate a correlation coefficient that indicates the magnitude of.

The connection phase estimation unit 73 calculates the correlation coefficient for each frequency component of each of the first phase current I _uL , the second phase current I _vL, and the third phase current I _wL, and the active power P. Then, the connection phase estimation unit 73 applies a predetermined filter to the correlation coefficient for each frequency component in order to improve the sensitivity of the high frequency component, and corrects the correlation coefficient for each frequency component. The connection phase estimation unit 73 does not have to perform the correction using the predetermined filter.

The connection phase estimation unit 73 applies a predetermined filter to each of the first phase current I _uL , the second phase current I _vL, and the third phase current I _wL , and corrects the correlation coefficient over the entire frequency. To integrate. Thus, the connection phase estimating unit 73, the first phase of the current I _uL of the three-phase alternating current supplied to the low-pressure customer group _5, the current I _wL each and active power of the second phase of the current I _vL and third phase Each correlation coefficient with P is calculated. The purpose of this process is to comprehensively evaluate the magnitude of the correlation.

When, for example, the connection phase estimation unit 73 has a relatively large correlation coefficient between the second phase current I _vL and the third phase current I _{wL and} a relatively small correlation coefficient between the first phase current I _uL . It is presumed that the power generation device 521, ..., Or the power generation device 52k is connected to the current I _vL of the second phase and the current I _wL of the third phase. Incidentally, the difference between this case, the connection phase estimator 73, the correlation coefficient of the current I _uL of the correlation coefficient and the first phase of the second phase of the current I the correlation coefficient or the three-phase current I _wL of _vL It may be further estimated that the larger the value is, the higher the reliability of the estimation result is.

Next, an example of the processing executed by the connection phase estimation device according to the embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing an example of processing executed by the connection phase estimation device according to the embodiment.

In step S10, the data acquisition unit 71 acquires the substation current data and the active power data.

In step S20, the current calculation unit 72 calculates the first total current I _H.

In step S30, the current calculation unit 72 calculates a first phase current I _uL of a three-phase alternating current is supplied to the low-pressure customer group _5, the second phase of the current I _vL and third phase current I _wL ..

In step S40, the connection phase estimation unit 73 includes the first phase current I _uL , the second phase current I _vL, and the third phase current I _wL calculated in step S30, and the validity acquired in step S10. The correlation with the active power P indicated by the power data is calculated.

In step S50, the connection phase estimation unit 73 sets the power generation device 521, ..., Or the power generation device to any of the first distribution line 31, the second distribution line 32, and the third distribution line 33 based on the correlation calculated in step S30. Estimate if 52k is connected.

The connection phase estimation device 7 according to the embodiment has been described above. The connection phase estimation device 7 has a high voltage based on the three-phase AC first-phase current I _u , second-phase current I _v, third-phase current I _w, and active power P indicated by the substation current data. The first total current I _H , which is the sum of the first phase current I _uH , the second phase current I _vH, and the third phase current I _wH of the three-phase AC supplied to the consumer group 4, is calculated. Next, the connection phase estimation device 7 uses the substation current data to indicate the three-phase AC first-phase current I _u , the second-phase current I _v, the third-phase current I _w, and the first total current I. based on the _H, calculates a first phase current I _uL, second phase of the current I _vL and third phase current I _wL of the three-phase AC which is supplied to the low-pressure customer group 5. The connection phase estimation device 7, a first phase current I _uL, and the current I _wL each of the second phase of the current I _vL and the third phase, based on the correlation between the active power P, the first distribution line 31 , The power generation device 521, ..., Or the power generation device 52k is estimated to which of the second distribution line 32 and the third distribution line 33 is connected. That is, the connection phase estimation device 7 eliminates the influence of the high-voltage consumer 41, ..., The high-voltage consumer 4k, which receives power from the distribution network 1, and then the connection phase of the power generation device 521, ..., Or the power generation device 52k. To estimate.

Therefore, the connection phase estimation device 7 is a power generation device 521 even if not only the low-voltage consumer 51, ..., The low-voltage consumer 5k but also the high-voltage consumer 41, ..., The high-voltage consumer 4k are supplied with power from the distribution network. , ... Or the connection phase of the power generation device 52k can be estimated accurately.

Further, the connection phase estimation device 7 uses the above equations (6), (7) and (8) to supply the low-voltage consumer group 5 with the current _IuL of the first phase of the three-phase alternating current. , and calculates the current _{I vL} and third phase current _{I wL} of the second phase. Thus, the connection phase estimation device 7, a first phase of the current I _uL small calculation _load, to calculate the current I _vL and third phase current I _wL of the second phase, the generator unit 521, ... or generator device 52k Connection phase can be estimated.

Further, the connection phase estimation device 7 uses the above equations (10), (11) and (12) to supply the low-voltage consumer group 5 with the current _IuL of the first phase of the three-phase alternating current. , and calculates the current _{I vL} and third phase current _{I wL} of the second phase. Alternatively, the connection phase estimation device 7 uses the above equations (13), (14) and (15) to supply the low-voltage consumer group 5 with the current _IuL of the first phase of the three-phase alternating current. , and calculates the current _{I vL} and third phase current _{I wL} of the second phase. Therefore, in the connection phase estimation device 7, the current I _uH of the first phase of the three-phase AC, the current I _vH of the second phase, and the current I _wH of the third phase supplied to the high-voltage consumer group 4 are _combined. even if not a balanced, first phase of the current I _uL, the current I _vL and third phase current I _wL of the second phase is calculated accurately, the power generation device 521, ... or connected phase of the generator 52k and It can be estimated with high accuracy.

The current calculation unit 72 includes equations (10), (11), and (12) according to the result of the connection phase estimation unit 73 estimating the connection phase of the power generation device 521, ..., Or the power generation device 52k. It may be determined which of equations (13), (14) and (15) is used.

Further, in the above embodiment, the connection phase estimation apparatus 7 first phase of the current I _uL calculated by the current calculation unit _72, a current I _wL each of the second phase of the current I _vL and a three-phase, active power The case where the connection phase estimation process is executed based on the correlation with the active power P indicated by the data has been described as an example, but the present invention is not limited to this. For example, the connection phase estimation device 7 is not the substation current data acquired from the ammeter included in the switch 6, but the power generation device 521 that executes the connection phase estimation process, ..., Or the three-phase AC upstream of the power generation device 52k. The connection phase estimation process may be executed based on the correlation between each of the first phase current, the second phase current, and the third phase current and the active power P.

Further, a program for realizing each function of the data acquisition unit 71, the current calculation unit 72, and the connection phase estimation unit 73 according to the above-described embodiment is recorded on a computer-readable recording medium and recorded on the recording medium. The process may be performed by loading the program into a computer system and executing it.

The computer system referred to here may include hardware such as an operating system (OS: Operating System) or peripheral devices. The computer-readable recording medium includes, for example, a floppy disk, a photomagnetic disk, a ROM (Read Only Memory), a writable non-volatile memory such as a flash memory, and a portable medium such as a DVD (Digital Versatile Disc). A computer system that holds a program for a certain period of time, such as a volatile memory inside a computer system that serves as a server or client when a program is transmitted via a storage device such as a hard disk built into the computer system, a network, or a communication line. Also includes.

Further, the above-mentioned program may be transmitted from a computer system in which this program is stored in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the transmission medium for transmitting a program means a medium having a function of transmitting information, such as a network such as the Internet or a communication line such as a telephone line.

Further, the above-mentioned program may be for realizing a part of the above-mentioned functions, and a program that can realize a part of the above-mentioned functions in combination with a program already recorded in the computer system, so-called. It may be a difference program. The above-mentioned program is read and executed by a processor such as a CPU (Central Processing Unit) included in the computer, for example.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and various modifications, substitutions or designs are made without departing from the gist of the present invention. You can make changes. Further, the configurations described in the above-described embodiments may be combined.

1 ... Distribution network, 2 ... Substation, 31 ... First distribution line, 32 ... Second distribution line, 33 ... Third distribution line, 4 ... High voltage consumer group, 41, ..., 4k ... High voltage consumer, 5 ... Low-voltage consumer group, 51, ..., 5k ... Low-voltage consumer, 511, ..., 51k ... Smart meter, 521, ..., 52k ... Power generation device, 6 ... Switch, 7 ... Connection phase estimation device, 71 ... Data acquisition unit , 72 ... Current calculation unit, 73 ... Connection phase estimation unit

Claims (5)

Substation current data showing each of the three-phase AC first-phase current, second-phase current, and third-phase current output by the substation, and low-voltage consumers receiving three-phase AC supply from the substation. A data acquisition unit that acquires active power data indicating the active power consumed by the group,
High-voltage consumer group from the substation based on the first-phase current, second-phase current, and third-phase current of the three-phase AC indicated by the substation current data and the active power indicated by the active power data. The first total current, which is the sum of the first phase current, the second phase current, and the third phase current of the three-phase AC supplied to the substation current data, is calculated, and the third phase AC current indicated by the substation current data is calculated. Based on each of the one-phase current, the second-phase current, and the third-phase current and the first total current, the first-phase current of the three-phase AC supplied to the low-voltage consumer group, the second Phase current and third phase current, which are converted into the three-phase AC voltage supplied to the high-voltage consumer group, the first phase current, the second phase current, and the third phase current. And the current calculation unit that calculates
The substation outputs three based on the correlation between each of the first phase current, the second phase current, and the third phase current calculated by the current calculation unit and the active power indicated by the active power data. Low pressure included in the low-voltage consumer group in any of the first distribution wire through which the first phase current of the phase AC flows, the second distribution wire through which the second phase current flows, and the third distribution wire through which the third phase current flows. A connection phase estimation unit that estimates whether the power generation equipment owned by the consumer is connected,
A connection phase estimator comprising. The current calculation unit is obtained by multiplying the first total current by a predetermined ratio from each of the first phase current, the second phase current, and the third phase current of the three-phase AC indicated by the substation current data. By subtracting the current, the three-phase AC first-phase current, second-phase current, and third-phase current supplied to the low-voltage consumer group are supplied to the high-voltage consumer group. Calculate the first-phase current, second-phase current, and third-phase current converted to the three-phase AC voltage.
The connection phase estimation device according to claim 1. The current calculation unit outputs the first total current from each of the first phase current, the second phase current, and the third phase current of the three-phase AC indicated by the substation current data. The current of the first phase of the three-phase AC supplied to the low-voltage consumer group by subtracting the current proportionally divided by the current of the first phase of the AC, the current of the second phase, and the current of the third phase. The first phase current, the second phase current, and the third phase current, which are the second phase current and the third phase current and are converted into the three-phase AC voltage supplied to the high-voltage consumer group. Calculate the current of
The connection phase estimation device according to claim 1. On the computer
Substation current data showing each of the three-phase AC first-phase current, second-phase current, and third-phase current output by the substation, and low-voltage consumers receiving three-phase AC supply from the substation. A data acquisition function that acquires active power data indicating the active power consumed by the group, and
High-voltage consumer group from the substation based on the first-phase current, second-phase current, and third-phase current of the three-phase AC indicated by the substation current data and the active power indicated by the active power data. The first total current, which is the sum of the first phase current, the second phase current, and the third phase current of the three-phase AC supplied to the substation current data, is calculated, and the third phase AC current indicated by the substation current data is calculated. Based on each of the one-phase current, the second-phase current, and the third-phase current and the first total current, the first-phase current of the three-phase AC supplied to the low-voltage consumer group, the second Phase current and third phase current, which are converted into the three-phase AC voltage supplied to the high-voltage consumer group, the first phase current, the second phase current, and the third phase current. With the current calculation function to calculate
The substation outputs three based on the correlation between each of the first phase current, the second phase current, and the third phase current calculated by the current calculation function and the active power indicated by the active power data. Low pressure included in the low-voltage consumer group in any of the first distribution wire through which the first phase current of the phase AC flows, the second distribution wire through which the second phase current flows, and the third distribution wire through which the third phase current flows. A connection phase estimation function that estimates whether the power generation equipment owned by the consumer is connected,
Connection phase estimation program to realize. Substation current data showing each of the three-phase AC first-phase current, second-phase current, and third-phase current output by the substation, and low-voltage consumers receiving three-phase AC supply from the substation. A data acquisition process for acquiring active power data indicating the active power consumed by the group, and
High-voltage consumer group from the substation based on the first-phase current, second-phase current, and third-phase current of the three-phase AC indicated by the substation current data and the active power indicated by the active power data. The first total current, which is the sum of the first phase current, the second phase current, and the third phase current of the three-phase AC supplied to the substation current data, is calculated, and the third phase AC current indicated by the substation current data is calculated. Based on each of the one-phase current, the second-phase current, and the third-phase current and the first total current, the first-phase current of the three-phase AC supplied to the low-voltage consumer group, the second Phase current and third phase current, which are converted into the three-phase AC voltage supplied to the high-voltage consumer group, the first phase current, the second phase current, and the third phase current. And the current calculation process to calculate
The substation outputs three based on the correlation between each of the first phase current, the second phase current, and the third phase current calculated in the current calculation step and the active power indicated by the active power data. Low pressure included in the low-voltage consumer group in any of the first distribution wire through which the first phase current of the phase AC flows, the second distribution wire through which the second phase current flows, and the third distribution wire through which the third phase current flows. A connection phase estimation process that estimates whether the power generation equipment owned by the consumer is connected, and
Connection phase estimation method including.

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