KR102645381B1 - Voltage sensitivity measurement method and measurement device using distributed controller measurement value - Google Patents

Abstract

In one embodiment, a method of measuring the voltage sensitivity of a point in a busbar in which a plurality of power devices are each connected to a plurality of points includes N measurement points (N is a natural number of 2 or more) among the plurality of points. obtaining active power measurements and reactive power measurements for; Obtaining a voltage measurement value and a power phase angle measurement value at the one point; The sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point (first sum) 2 sum) and the sum of the products of the third parameter for each measurement point and the power phase angle of the point (third sum) to calculate the voltage estimate for the point; adjusting the first parameter, the second parameter, and the third parameter so that the difference between the voltage measurement value and the voltage estimate value for the one point is minimized; and determining active power sensitivity according to the first parameter for each measurement point and determining reactive power sensitivity according to the second parameter.

Description

Voltage sensitivity measurement method and measurement device using distributed controller measurements {VOLTAGE SENSITIVITY MEASUREMENT METHOD AND MEASUREMENT DEVICE USING DISTRIBUTED CONTROLLER MEASUREMENT VALUE}

This embodiment relates to a technique for measuring voltage sensitivity. More specifically, this embodiment relates to a technique for measuring voltage sensitivity using only power measurement values for some points.

In a busbar where multiple power devices are connected to multiple points, the voltage change at a specific point in response to the power change at each point can be understood as the voltage sensitivity of the specific point.

As the number of unstable power devices such as renewable energy generation sources increases, measuring voltage sensitivity becomes more important. For example, if a voltage problem occurs at a specific point, the voltage problem at the specific point can be quickly alleviated by adjusting the output starting from the power device at the point with the highest voltage sensitivity. To do this, accurate measurement of voltage sensitivity is required.

In conventional research, several methods have been proposed to measure voltage sensitivity.

One method is to use the Newton-Raphson's Jacobian matrix, which can calculate voltage sensitivity very accurately, but also provides all grid information for all points - e.g. , voltage, phase angle, line, topology, etc. - there is a problem that is needed.

The Perturb&Observe current calculation-based estimation method can calculate voltage sensitivity relatively accurately and without special calculations, but there is a problem in that it is difficult to calculate voltage sensitivity related to active power.

The estimation method through radial distribution network circuit analysis can calculate voltage sensitivity only with information at a specific point if all line information is known, but there is a problem in that the impedance information of all lines must be accurately known.

In this way, the method based on conventional research requires information about all points to accurately calculate voltage sensitivity, but there is a problem that it is difficult to use this method in situations where distributed controllers are not placed at all points.

Against this background, the purpose of this embodiment is, in one aspect, to provide a technique for calculating voltage sensitivity relatively accurately. In another aspect, the purpose of this embodiment is to provide a technique for measuring voltage sensitivity using only power measurement values for some points.

In order to achieve the above-described object, one embodiment provides a method for measuring the voltage sensitivity of one point in a busbar in which a plurality of power devices are each connected to a plurality of points, where N (N) of the plurality of points is a natural number of 2 or more) acquiring active power measurements and reactive power measurement values for measurement points; Obtaining a voltage measurement value and a power phase angle measurement value at the one point; The sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point (first sum) 2 sum) and the sum of the products of the third parameter for each measurement point and the power phase angle of the point (third sum) to calculate the voltage estimate for the point; adjusting the first parameter, the second parameter, and the third parameter so that the difference between the voltage measurement value and the voltage estimate value for the one point is minimized; and determining active power sensitivity according to the first parameter for each measurement point and determining reactive power sensitivity according to the second parameter.

The measurement method further includes the step of obtaining a measured inlet voltage of a power device connected to the one point, and in calculating the voltage estimate value, the measured inlet voltage of the one point, the first The voltage estimate for the point can be calculated by combining the sum, the second sum, and the third sum.

The measurement method uses a dataset M (M is a natural number of 2 or more) including the active power measurements, the reactive power measurements, the voltage measurements, the power phase angle measurements, and the incoming voltage measurements. A step of acquiring data at different time points and adjusting the first parameter, the second parameter, and the third parameter for the M data sets may be performed.

Another embodiment is a method of measuring the voltage sensitivity of a point in a busbar where a plurality of power devices are each connected to a plurality of points, where N (N is a natural number of 2 or more) measurement points among the plurality of points. obtaining active power measurements, reactive power measurements, and power phase angle measurements for; Obtaining a voltage measurement value at the one point; The sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point (first sum) 2 sum) and calculating a voltage estimate for the point using the sum (third sum) of the products of the third parameter for each measurement point and the power phase angle of each measurement point; adjusting the first parameter, the second parameter, and the third parameter so that the difference between the voltage measurement value and the voltage estimate value for the one point is minimized; and determining active power sensitivity according to the first parameter for each measurement point and determining reactive power sensitivity according to the second parameter.

The measurement method further includes the step of obtaining a measured inlet voltage of a power device connected to the one point, and in calculating the voltage estimate value, the measured inlet voltage of the one point, the first The voltage estimate for the point can be calculated by combining the sum, the second sum, and the third sum.

Another embodiment is a method of measuring the voltage sensitivity of one point in a busbar where a plurality of power devices are each connected to a plurality of points, measuring N (N is a natural number of 2 or more) among the plurality of points. Obtaining active power measurements, reactive power measurements, power phase angle measurements, voltage measurements and incoming voltage measurements for the points; Obtaining a voltage measurement value at the one point; The sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point (first sum) 2 sum), the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (third sum), and the sum of the differences between the voltage measurement value of each measurement point and the incoming voltage measurement value (fourth sum) Calculating an estimated voltage value for the one point using (sum); adjusting the first parameter, the second parameter, and the third parameter so that the difference between the voltage measurement value and the voltage estimate value for the one point is minimized; and determining active power sensitivity according to the first parameter for each measurement point and determining reactive power sensitivity according to the second parameter.

The measurement method further includes the step of obtaining a measured inlet voltage of a power device connected to the one point, and in calculating the voltage estimate value, the measured inlet voltage of the one point, the first The voltage estimate value for the one point can be calculated by combining the sum, the second sum, the third sum, and the fourth sum.

In the step of adjusting the first parameter, the second parameter, and the third parameter, the measurement method uses a least square method to adjust the first parameter, the second parameter, and the third parameter. It can be adjusted.

Another embodiment is an apparatus for measuring the voltage sensitivity of a point in a busbar where a plurality of power devices are each connected to a plurality of points, measuring N (N is a natural number of 2 or more) of the plurality of points. A communication circuit that communicates with distributed controllers linked to branches; a data acquisition circuit that acquires the voltage measurement value and power phase angle measurement value of the one point and the active power measurement value and reactive power measurement value of each measurement point from the distributed controllers; And the sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point ( Calculate the voltage estimate for the point using the second sum) and the sum of the products of the third parameter for each measurement point and the power phase angle of the point (third sum), and calculate the voltage estimate for the point. The first parameter, the second parameter, and the third parameter are adjusted to minimize the difference between the voltage measurement value and the voltage estimate value, and the active power sensitivity is determined for each measurement point according to the first parameter, and the Provides a voltage sensitivity measurement device that includes a calculation circuit that determines reactive power sensitivity according to two parameters.

The data acquisition circuit acquires the incoming end voltage measurement value of a power device connected to the one point, and the calculation circuit acquires the incoming end voltage measurement value of the one point, the first sum, the second sum, and the first sum. By combining the three sums, the voltage estimate for the one point can be calculated.

The data acquisition circuit generates M a data set including the active power measurements, the reactive power measurements, the voltage measurements, the power phase angle measurements, and the incoming voltage measurements (M is a natural number of 2 or more. ) are obtained at different time points, and the calculation circuit can adjust the first parameter, the second parameter, and the third parameter for the M data sets.

The calculation circuit may adjust the first parameter, the second parameter, and the third parameter using the least square method.

Another embodiment is a device for measuring the voltage sensitivity of one point in a busbar where a plurality of power devices are each connected to a plurality of points,

A communication circuit that communicates with distributed controllers linked to N measurement points (N is a natural number greater than or equal to 2) among the plurality of points; a data acquisition circuit that acquires the voltage measurement value of the one point and obtains the active power measurement value, reactive power measurement value, and power phase angle measurement value of each measurement point from the distributed controllers; And the sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point ( Calculate the voltage estimate for the point using the second sum) and the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (third sum), and calculate the voltage estimate for the one point. The first parameter, the second parameter, and the third parameter are adjusted to minimize the difference between the voltage measurement value and the voltage estimate value, and the active power sensitivity is determined for each measurement point according to the first parameter, and the Provides a voltage sensitivity measurement device that includes a calculation circuit that determines reactive power sensitivity according to two parameters.

The data acquisition circuit acquires the incoming end voltage measurement value of a power device connected to the one point, and the calculation circuit acquires the incoming end voltage measurement value of the one point, the first sum, the second sum, and the first sum. By combining the three sums, the voltage estimate for the one point can be calculated.

Another embodiment is an apparatus for measuring the voltage sensitivity of a point in a busbar where a plurality of power devices are each connected to a plurality of points, measuring N (N is a natural number of 2 or more) of the plurality of points. A communication circuit that communicates with distributed controllers linked to branches; A data acquisition circuit that acquires the voltage measurement value of the one point and acquires the active power measurement value, reactive power measurement value, power phase angle measurement value, voltage measurement value, and incoming voltage measurement value of each measurement point from the distributed controllers. ; And the sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point ( 2nd sum), the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (3rd sum), and the sum of the differences between the voltage measurement value of each measurement point and the incoming voltage measurement value (3rd sum) 4 sum) is used to calculate the voltage estimate value for the one point, and the first parameter, the second parameter, and the third parameter are calculated so that the difference between the voltage measurement value and the voltage estimate value for the one point is minimized. It provides a voltage sensitivity measuring device including a calculation circuit that adjusts and determines active power sensitivity according to the first parameter for each measurement point and determines reactive power sensitivity according to the second parameter.

As described above, according to this embodiment, voltage sensitivity can be calculated relatively accurately and voltage sensitivity can be measured using only the power measurement values for some points.

1 is a configuration diagram of a voltage sensitivity measurement system according to a first embodiment.
Figure 2 is a configuration diagram of a voltage sensitivity measuring device according to the first embodiment.
Figure 3 is a flowchart of a voltage sensitivity measurement method according to the first embodiment.
Figure 4 is a configuration diagram of a voltage sensitivity measurement system according to a second embodiment.
Figure 5 is a configuration diagram of a voltage sensitivity measuring device according to a second embodiment.
Figure 6 is a flowchart of the voltage sensitivity measurement method according to the second embodiment.
Figure 7 is a configuration diagram of a voltage sensitivity measurement system according to a third embodiment.
Figure 8 is a configuration diagram of a voltage sensitivity measuring device according to a third embodiment.
Figure 9 is a flowchart of the voltage sensitivity measurement method according to the third embodiment.

Hereinafter, some embodiments of the present invention will be described in detail through illustrative drawings. When adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Additionally, when describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, or order of the component is not limited by the term. When a component is described as being “connected,” “coupled,” or “connected” to another component, that component may be directly connected or connected to that other component, but there is another component between each component. It will be understood that elements may be “connected,” “combined,” or “connected.”

1 is a configuration diagram of a voltage sensitivity measurement system according to a first embodiment.

Referring to FIG. 1, the voltage sensitivity measurement system 100 may include a plurality of power devices 120a to 120m connected to the bus bar 130. A plurality of power devices (120a to 120m) may each be connected to the busbar 130 through different points (N1 to Nm).

The voltage sensitivity measurement system 100 may include a voltage sensitivity measurement device (hereinafter referred to as 'measuring device', 110) that measures the voltage sensitivity of a point.

Among the plurality of power devices 120a to 120m, some 120j are distributed controllers that can transmit power data to the measurement device 110 and receive control signals from the measurement device 110. Alternatively, a separate meter that can generate power data and transmit it to the measuring device 110 may be placed at some point (Nj).

Points at which power data can be transmitted to the measurement device 110 may be called measurement points.

The measurement device 110 may receive power data from measurement points Nj. Power data may include, for example, active power measurements (Pj) at the point, reactive power measurements (Qj), power phase angle measurements, and power device ( 120j) may include the incoming voltage measurement value, and may include the voltage measurement value at the corresponding point.

Among the plurality of points (N1 to Nm) where the plurality of power devices (120a to 120m) are connected, points excluding the measurement points (Nj) may be referred to as non-measurement points (Ni).

The measurement device 110 may not be able to obtain power data from non-measurement points Ni. The measurement device 110 may not receive all of the above-described types of power data from non-measurement points Ni, and may receive some measurement values - for example, active power measurement values, reactive power measurement values, etc. You may not be able to do it.

In the conventional voltage sensitivity measurement method, when non-measurement points (Ni) were included in a plurality of points (120a ~ 120m), voltage sensitivity could not be accurately calculated. In contrast, the measuring device according to this embodiment can calculate voltage sensitivity relatively accurately even when non-measurement points (Ni) are included.

The measuring device 110 can calculate voltage sensitivity according to a data-driven method.

[Equation 1]

In equation 1, is the voltage measurement value at a point to be measured, is the incoming voltage measurement value at one point, is the active power sensitivity of each point, is the active power value at each point, is the reactive power sensitivity of each point, is the reactive power value at each point.

The power value may not be measured at some of the plurality of points. If the equation is separated into points where the power value is measured and points where the power value is not measured, the equation becomes the latter part of Equation 1.

here, represents the product of the active power sensitivity and the active power measurement value at the point where the active power value is measured, represents the product of the reactive power sensitivity and the reactive power measurement value at the point where the reactive power value is measured.

and, represents the product of the active power sensitivity at the point where the active power value is not measured and the active power value (a value that is not actually obtained), represents the product of the reactive power sensitivity and the reactive power value (a value not actually obtained) at the point where the reactive power value is not measured.

Because this data-driven method includes power values that are not measured, it is impossible to accurately calculate voltage sensitivity for each point.

The measuring device 110 according to the first embodiment solves the above-mentioned problem by replacing the equation for the point where the active power value and the reactive power value are not measured with another equation using the power phase angle measurement value at one point. there is.

[Equation 2]

First, the voltage measurement value at one point can be expressed as Equation 2. here, is the active power measurement value at the measurement point, is the corresponding parameter (coefficient), is the reactive power measurement value at the measurement point, is the corresponding parameter (coefficient), is the active power value at a non-measured point, is the corresponding parameter (coefficient), is the reactive power value at a non-measurement point, is the corresponding parameter (coefficient).

[Equation 3]

Equation 4]

If Equation 2 is organized, it can become a determinant such as Equation 3 and Equation 4.

[Equation 5]

Meanwhile, the power phase angle measurement value at one point is the active power measurement value at the measurement point as shown in Equation 5. and reactive power measurements , and the active power value at a non-measurement point and reactive power value It can be expressed as

In Equation 5, coefficients may be attached to the active/reactive power (measured) values.

[Equation 6]

If Equation 5 is organized, it can be the same determinant as Equation 6.

[Equation 7]

[Equation 8]

Equation 6 is the active power value for a non-measured point. and reactive power value If summarized, it becomes Equation 8.

And, by substituting Equation 8 into Equation 4, Equation 9 below can be obtained.

[Equation 9]

In Equation 9, the active power value coefficient of is called the first parameter, and the reactive power value coefficient of is called the second parameter, and the power phase angle measurement value coefficient of can be called the third parameter.

The measurement device 110 is the sum (first sum) of the products of the first parameter for each measurement point and the active power measurement value of each measurement point. , the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point (second sum) , and the sum of the products of the third parameter for each measurement point and the power phase angle measurement value at one point (third sum) You can calculate the voltage estimate for one point using .

Additionally, the measuring device 110 may adjust the first, second, and third parameters so that the difference between the measured voltage value and the estimated voltage value for one point is minimized.

In addition, the measuring device 110 may determine the active power sensitivity of each measurement point according to the first parameter and the reactive power sensitivity of each measurement point according to the second parameter. For example, the measurement device 110 may determine the first parameter as the active power sensitivity of each measurement point and the second parameter as the reactive power sensitivity of each measurement point.

Figure 2 is a configuration diagram of a voltage sensitivity measuring device according to the first embodiment.

Referring to FIG. 2, the measurement device 110 may include a communication circuit 210, a data acquisition circuit 220, and a calculation circuit 230.

The communication circuit 210 can communicate with distributed controllers linked to N measurement points (N is a natural number of 2 or more) among a plurality of points. And, the communication circuit 210 can receive power data of measurement points from distributed controllers. Power data may include active power measurements, reactive power measurements, voltage measurements, incoming voltage measurements, and power phase angle measurements.

The data acquisition circuit 220 can obtain the voltage measurement value and power phase angle measurement value at a point where voltage sensitivity is to be calculated, and obtain the active power measurement value and reactive power measurement value at each measurement point from the distributed controllers.

The data acquisition circuit 220 uses its own measurement circuit to acquire the voltage measurement value at one point, the incoming end voltage measurement value, the power phase angle measurement value, the active power measurement value, and the reactive power measurement value, or Through communication - communication can be achieved by the communication circuit 210 - the voltage measurement value at one point, the incoming end voltage measurement value, the power phase angle measurement value, the active power measurement value, and the reactive power measurement value, etc. can be obtained. there is.

The data acquisition circuit 220 can acquire M (M is a natural number of 2 or more) datasets at different points in time.

The data set may include values necessary for calculating the voltage sensitivity of the calculation circuit 230. For example, the data set may include voltage measurement values for each measurement point and one point, incoming voltage measurement values, and power phase angle measurement. It can include values, active power measurements, and reactive power measurements.

The calculation circuit 230 is the sum (first sum) of the products of the first parameter for each measurement point and the active power measurement value at each measurement point, the second parameter for each measurement point and the reactive power measurement value at each measurement point. Calculate the voltage estimate for one point using the sum of the products (second sum) and the sum of the products of the third parameter for each measurement point and the power phase angle of one point (third sum), and calculate the voltage estimate for one point. The first, second, and third parameters are adjusted to minimize the difference between the measured voltage value and the estimated voltage value, and for each measurement point, the active power sensitivity is determined according to the first parameter, and the active power sensitivity is determined according to the second parameter. It can be determined by power sensitivity.

The calculation circuit 230 can calculate the voltage estimate value for a point by combining the incoming end voltage measurement value, the first sum, the second sum, and the third sum of the point.

When the data acquisition circuit 220 acquires M data sets, the calculation circuit 230 selects the first parameter, the second parameter, and the third parameter to minimize the difference between the voltage measurement value and the voltage estimate value for the M data sets. can be adjusted.

The calculation circuit 230 can adjust the first parameter, second parameter, and third parameter using the least square method, for example, voltage measurement values and voltage calculated for M data sets. The first, second, and third parameters can be adjusted so that the sum of the squares of the differences between the estimated values is minimized.

Figure 3 is a flowchart of a voltage sensitivity measurement method according to the first embodiment.

Referring to FIG. 3, the measurement device can obtain active power measurement values and reactive power measurement values for N measurement points (N is a natural number of 2 or more) among a plurality of points (S300).

And, the measuring device can obtain the voltage measurement value and power phase angle measurement value at one point (S302).

The measuring device can further obtain the incoming voltage measurement value of a power device connected to a point.

In addition, the measuring device is the sum (first sum) of the products of the first parameter for each measurement point and the active power measurement value of each measurement point, the second parameter for each measurement point and the reactive power measurement value of each measurement point. The voltage estimate for a point can be calculated using the sum of the products (second sum) and the sum of the products of the third parameter for each measurement point and the power phase angle of the point (third sum) (S304).

The measuring device can calculate the voltage estimate for a point by combining the incoming voltage measurement value, the first sum, the second sum, and the third sum of the point.

In addition, the measuring device can adjust the first parameter, second parameter, and third parameter so that the difference between the voltage measurement value and the voltage estimate value for one point is minimized (S306).

The measurement device acquires a dataset including active power measurements, reactive power measurements, voltage measurements, power phase angle measurements, and incoming voltage measurements at M (M is a natural number of 2 or more) different points in time. This can be done, and the first, second, and third parameters can be adjusted for M datasets.

And, for each measurement point, the measuring device can determine active power sensitivity according to the first parameter and reactive power sensitivity according to the second parameter (S308).

Figure 4 is a configuration diagram of a voltage sensitivity measurement system according to a second embodiment.

Referring to FIG. 4, the voltage sensitivity measurement system 400 may include a plurality of power devices 420a to 420m connected to the bus bar 430. A plurality of power devices (420a to 420m) may each be connected to the busbar 430 through different points (N1 to Nm).

The voltage sensitivity measurement system 400 may include a voltage sensitivity measurement device (hereinafter referred to as 'measuring device', 410) that measures the voltage sensitivity of a point.

Among the plurality of power devices 420a to 420m, some 420j are distributed controllers that can transmit power data to the measurement device 410 and receive control signals from the measurement device 410. Alternatively, a separate meter that can generate power data and transmit it to the measuring device 410 may be placed at some point (Nj).

Points at which power data can be transmitted to the measurement device 410 may be called measurement points.

The measurement device 410 may receive power data from measurement points Nj. The power data may include, for example, an active power measurement value (Pj) at the corresponding point, a reactive power measurement value (Qj), and a power phase angle measurement value (θj). It may include the incoming voltage measurement value of the power device 420j and may include the voltage measurement value at the corresponding point.

Among the plurality of points (N1 to Nm) where the plurality of power devices (420a to 420m) are connected, points excluding the measurement points (Nj) may be referred to as non-measurement points (Ni).

The measurement device 410 may not be able to obtain power data from non-measurement points Ni. The measurement device 410 may not receive all of the above-described types of power data from non-measurement points Ni, and receives some measurement values - for example, active power measurement values, reactive power measurement values, etc. You may not be able to do it.

In the conventional voltage sensitivity measurement method, when non-measurement points (Ni) were included for a plurality of points (420a ~ 420m), voltage sensitivity could not be accurately calculated. In contrast, the measuring device according to this embodiment can calculate voltage sensitivity relatively accurately even when non-measurement points (Ni) are included.

The measuring device 410 according to the second embodiment can replace the equation for the point where the active power value and the reactive power value are not measured with another equation by using the power phase angle measurement values of the measurement points.

[Equation 10]

Equation 10 is the power phase angle measurement values of the measurement points. (Vector) is expressed as the active power measurement value and reactive power measurement value at the measurement point, and the active power value and reactive power value at the non-measurement point.

[Equation 11]

If Equation 10 is organized into the active power value and reactive power value for the non-measurement point, Equation 11 can be obtained, and if this is substituted into Equation 4, it can be obtained as Equation 12.

[Equation 12]

Active power value in equation 12 coefficient of is called the first parameter, and the reactive power value coefficient of is called the second parameter, and the power phase angle measurement value coefficient of can be called the third parameter.

The measurement device 410 is the sum (first sum) of the products of the first parameter for each measurement point and the active power measurement value at each measurement point, the second parameter for each measurement point, and the reactive power measurement value at each measurement point. The voltage estimate for one point can be calculated using the sum of the products (second sum) and the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (third sum).

And, the measuring device 410 may adjust the first parameter, the second parameter, and the third parameter so that the difference between the voltage measurement value and the voltage estimate value for one point is minimized.

In addition, the measuring device 410 may determine the active power sensitivity of each measurement point according to the first parameter and the reactive power sensitivity of each measurement point according to the second parameter. For example, the measurement device 410 may determine the first parameter as the active power sensitivity of each measurement point and the second parameter as the reactive power sensitivity of each measurement point.

Figure 5 is a configuration diagram of a voltage sensitivity measuring device according to a second embodiment.

Referring to FIG. 5, the measurement device 410 may include a communication circuit 510, a data acquisition circuit 520, and a calculation circuit 530.

The communication circuit 510 can communicate with distributed controllers linked to N measurement points (N is a natural number of 2 or more) among a plurality of points. And, the communication circuit 510 can receive power data of measurement points from distributed controllers. Power data may include active power measurements, reactive power measurements, voltage measurements, incoming voltage measurements, and power phase angle measurements.

The data acquisition circuit 520 can obtain the voltage measurement value at one point and the active power measurement value, reactive power measurement value, and power phase angle measurement value at each measurement point from the distributed controllers.

The data acquisition circuit 520 uses its own measurement circuit to acquire the voltage measurement value at one point, the incoming end voltage measurement value, the power phase angle measurement value, the active power measurement value, and the reactive power measurement value, or Through communication - communication can be achieved by the communication circuit 510 - the voltage measurement value at one point, the incoming end voltage measurement value, the power phase angle measurement value, the active power measurement value, and the reactive power measurement value, etc. can be obtained. there is.

The data acquisition circuit 520 can acquire M (M is a natural number of 2 or more) datasets at different points in time.

The data set may include values necessary for calculating the voltage sensitivity of the calculation circuit 530. For example, the data set may include voltage measurement values for each measurement point and one point, incoming voltage measurement values, and power phase angle measurement. It can include values, active power measurements, and reactive power measurements.

The calculation circuit 530 is the sum (first sum) of the products of the first parameter for each measurement point and the active power measurement value at each measurement point, the second parameter for each measurement point and the reactive power measurement value at each measurement point. Calculate the voltage estimate for one point using the sum of the products (second sum) and the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (third sum), and calculate the voltage estimate for one point. The first, second, and third parameters are adjusted to minimize the difference between the measured voltage value and the estimated voltage value, and for each measurement point, the active power sensitivity is determined according to the first parameter and the active power sensitivity is determined according to the second parameter. It can be determined by reactive power sensitivity.

The calculation circuit 530 can calculate the voltage estimate value for a point by combining the incoming end voltage measurement value, the first sum, the second sum, and the third sum of the point.

When the data acquisition circuit 520 acquires M data sets, the calculation circuit 530 sets the first parameter, the second parameter, and the third parameter to minimize the difference between the voltage measurement value and the voltage estimate value for the M data sets. can be adjusted.

The calculation circuit 530 can adjust the first parameter, second parameter, and third parameter using the least square method, for example, voltage measurement values and voltage calculated for M data sets. The first, second, and third parameters can be adjusted so that the sum of the squares of the differences between the estimated values is minimized.

Figure 6 is a flowchart of the voltage sensitivity measurement method according to the second embodiment.

Referring to FIG. 6, the measurement device can acquire active power measurement values, reactive power measurement values, and power phase angle measurement values for N measurement points (N is a natural number of 2 or more) among a plurality of points. (S600).

And, the measuring device can obtain the voltage measurement value at one point (S602).

The measuring device can further obtain the incoming voltage measurement value of a power device connected to a point.

In addition, the measuring device is the sum (first sum) of the products of the first parameter for each measurement point and the active power measurement value of each measurement point, the second parameter for each measurement point and the reactive power measurement value of each measurement point. The voltage estimate for one point can be calculated using the sum of the products (second sum) and the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (third sum) (S604) .

The measuring device can calculate the voltage estimate for a point by combining the incoming voltage measurement value, the first sum, the second sum, and the third sum of the point.

In addition, the measuring device can adjust the first parameter, second parameter, and third parameter so that the difference between the voltage measurement value and the voltage estimate value for one point is minimized (S606).

The measurement device acquires a dataset including active power measurements, reactive power measurements, voltage measurements, power phase angle measurements, and incoming voltage measurements at M (M is a natural number of 2 or more) different points in time. This can be done, and the first, second, and third parameters can be adjusted for M datasets.

And, for each measurement point, the measuring device can determine active power sensitivity according to the first parameter and reactive power sensitivity according to the second parameter (S608).

Figure 7 is a configuration diagram of a voltage sensitivity measurement system according to a third embodiment.

Referring to FIG. 7, the voltage sensitivity measurement system 700 may include a plurality of power devices 720a to 720m connected to the bus bar 730. A plurality of power devices (720a to 720m) may each be connected to the busbar 730 through different points (N1 to Nm).

The voltage sensitivity measurement system 700 may include a voltage sensitivity measurement device (hereinafter referred to as 'measuring device', 710) that measures the voltage sensitivity of a point.

Among the plurality of power devices 720a to 720m, some 720j are distributed controllers that can transmit power data to the measurement device 710 and receive control signals from the measurement device 710. Alternatively, a separate meter that can generate power data and transmit it to the measuring device 710 may be placed at some point (Nj).

Points at which power data can be transmitted to the measurement device 710 may be called measurement points.

The measurement device 710 may receive power data from measurement points Nj. The power data may include, for example, an active power measurement value (Pj) at the corresponding point, a reactive power measurement value (Qj), and a power phase angle measurement value (θj). It may include the incoming voltage measurement value (V) of the power device 720j, and may include the voltage measurement value (F) at the corresponding point.

Among the plurality of points (N1 to Nm) where the plurality of power devices (720a to 720m) are connected, points excluding the measurement points (Nj) may be referred to as non-measurement points (Ni).

The measurement device 710 may not be able to obtain power data from non-measurement points Ni. The measurement device 710 may not receive all of the above-described types of power data from non-measurement points Ni, and receives some measurement values - for example, active power measurement values, reactive power measurement values, etc. You may not be able to do it.

In the conventional voltage sensitivity measurement method, when non-measurement points (Ni) were included for a plurality of points (720a ~ 720m), voltage sensitivity could not be accurately calculated. In contrast, the measuring device according to this embodiment can calculate voltage sensitivity relatively accurately even when non-measurement points (Ni) are included.

The measuring device 710 according to the third embodiment can replace the equation for the point where the active power value and the reactive power value are not measured with another equation by using all the voltage measurement values and power phase measurement values of the measurement points. there is.

[Equation 13]

[Equation 14]

Voltage measurements at measuring points (Vector) can be expressed as Equation 13, and by expressing the power phase measurements in the same way and then combining them, Equation 14 can be obtained.

[Equation 15]

And, by substituting Equation 14 into Equation 4 and reorganizing, Equation 15 can be obtained.

The measurement device 710 is the sum (first sum) of the products of the first parameter for each measurement point and the active power measurement value of each measurement point. , the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point (second sum) , the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (third sum) and the sum of the differences between the voltage measurement value at each measurement point and the incoming voltage measurement value (fourth sum). The voltage estimate value for the one point can be calculated using .

Additionally, the measuring device 710 may adjust the first, second, and third parameters so that the difference between the measured voltage value and the estimated voltage value for one point is minimized.

Additionally, the measuring device 710 may determine the active power sensitivity of each measurement point according to the first parameter and the reactive power sensitivity of each measurement point according to the second parameter. For example, the measurement device 710 may determine the first parameter as the active power sensitivity of each measurement point and the second parameter as the reactive power sensitivity of each measurement point.

Figure 8 is a configuration diagram of a voltage sensitivity measuring device according to a third embodiment.

Referring to FIG. 8, the measurement device 710 may include a communication circuit 810, a data acquisition circuit 820, and a calculation circuit 830.

The communication circuit 810 can communicate with distributed controllers linked to N measurement points (N is a natural number of 2 or more) among a plurality of points. And, the communication circuit 810 can receive power data of measurement points from distributed controllers. Power data may include active power measurements, reactive power measurements, voltage measurements, incoming voltage measurements, and power phase angle measurements.

The data acquisition circuit 820 acquires the voltage measurement value at one point and receives the active power measurement value, reactive power measurement value, power phase angle measurement value, voltage measurement value, and incoming voltage measurement value at each measurement point from the distributed controllers. It can be obtained.

The data acquisition circuit 820 uses its own measurement circuit to acquire the voltage measurement value at one point, the incoming end voltage measurement value, the power phase angle measurement value, the active power measurement value, and the reactive power measurement value, or Through communication - communication can be achieved by the communication circuit 810 - the voltage measurement value at one point, the incoming end voltage measurement value, the power phase angle measurement value, the active power measurement value, and the reactive power measurement value, etc. can be obtained. there is.

The data acquisition circuit 820 can acquire M (M is a natural number of 2 or more) datasets at different points in time.

The data set may include values necessary for calculating the voltage sensitivity of the calculation circuit 830. For example, the data set may include voltage measurement values for each measurement point and one point, incoming voltage measurement values, and power phase angle measurement. It can include values, active power measurements, and reactive power measurements.

The calculation circuit 830 is the sum (first sum) of the products of the first parameter for each measurement point and the active power measurement value at each measurement point, the second parameter for each measurement point and the reactive power measurement value at each measurement point. The sum of the products (second sum), the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (third sum), and the voltage measurement value of each measurement point and the incoming voltage measurement value. Calculate the voltage estimate value for one point using the sum of the differences (fourth sum), and adjust the first, second, and third parameters so that the difference between the voltage measurement value and the voltage estimate value for one point is minimized. , for each measurement point, active power sensitivity can be determined according to the first parameter, and reactive power sensitivity can be determined according to the second parameter.

The calculation circuit 830 can calculate the voltage estimate value for a point by combining the incoming voltage measurement value, the first sum, the second sum, the third sum, and the fourth sum of the point.

When the data acquisition circuit 820 acquires M data sets, the calculation circuit 830 sets the first, second, and third parameters to minimize the difference between the voltage measurement value and the voltage estimate value for the M data sets. can be adjusted.

The calculation circuit 830 can adjust the first parameter, second parameter, and third parameter using the least square method, for example, voltage measurement values and voltage calculated for M data sets. The first, second, and third parameters can be adjusted so that the sum of the squares of the differences between the estimated values is minimized.

Figure 9 is a flowchart of the voltage sensitivity measurement method according to the third embodiment.

Referring to FIG. 9, the measurement device measures active power, reactive power, power phase angle measurements, and voltage measurements for N measurement points (N is a natural number of 2 or more) among a plurality of points. and incoming end voltage measurements can be obtained (S900).

The measuring device can obtain a voltage measurement value at one point (S902).

The measuring device can further obtain the incoming voltage measurement value of a power device connected to a point.

The measuring device is the sum (first sum) of the products of the first parameter for each measurement point and the active power measurement value of each measurement point, the product of the second parameter for each measurement point and the reactive power measurement value of each measurement point. The sum (second sum), the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (third sum), and the sum of the differences between the voltage measurement value of each measurement point and the incoming voltage measurement value. (4th sum) can be used to calculate the voltage estimate for one point (S904).

The measuring device can calculate the voltage estimate value for a point by combining the incoming voltage measurement value, the first sum, the second sum, the third sum, and the fourth sum of the point.

Additionally, the measuring device can adjust the first parameter, second parameter, and third parameter so that the difference between the voltage measurement value and the voltage estimate value for one point is minimized (S906).

And, for each measurement point, the measuring device can determine active power sensitivity according to the first parameter and reactive power sensitivity according to the second parameter (S908).

As described above, according to this embodiment, voltage sensitivity can be calculated relatively accurately and voltage sensitivity can be measured using only the power measurement values for some points.

Terms such as “include,” “comprise,” or “have,” as used above, mean that the corresponding component may be included, unless specifically stated to the contrary, and do not exclude other components. It should be interpreted that it may further include other components. All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the meaning in the context of the related technology, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in the present invention.

Claims (15)

In a method of measuring the voltage sensitivity of one point in a busbar where a plurality of power devices are each connected to a plurality of points,
Obtaining active power measurement values and reactive power measurement values for N measurement points (N is a natural number of 2 or more) among the plurality of points;
Obtaining a voltage measurement value and a power phase angle measurement value at the one point;
The sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point (first sum) 2 sum) and the sum of the products of the third parameter for each measurement point and the power phase angle of the point (third sum) to calculate the voltage estimate for the point;
adjusting the first parameter, the second parameter, and the third parameter so that the difference between the voltage measurement value and the voltage estimate value for the one point is minimized; and
For each measurement point, determining active power sensitivity according to the first parameter and determining reactive power sensitivity according to the second parameter,
A method of measuring voltage sensitivity, wherein the plurality of points include non-measurement points where power measurement values are not obtained. According to paragraph 1,
Further comprising the step of obtaining an incoming voltage measurement value of a power device connected to the one point,
In the step of calculating the voltage estimate value,
A voltage sensitivity measurement method that calculates a voltage estimate for a point by combining the incoming voltage measurement value of the point, the first sum, the second sum, and the third sum. According to paragraph 2,
A dataset including the active power measurements, the reactive power measurements, the voltage measurements, the power phase angle measurements, and the incoming voltage measurements is collected at M (M is a natural number of 2 or more) different time points. Obtained from,
A voltage sensitivity measurement method that performs the step of adjusting the first parameter, the second parameter, and the third parameter for the M data sets. In a method of measuring the voltage sensitivity of one point in a busbar where a plurality of power devices are each connected to a plurality of points,
Obtaining active power measurement values, reactive power measurement values, and power phase angle measurement values for N measurement points (N is a natural number of 2 or more) among the plurality of points;
Obtaining a voltage measurement value at the one point;
The sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point (first sum) 2 sum) and the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (third sum) to calculate the voltage estimate value for the one point;
adjusting the first parameter, the second parameter, and the third parameter so that the difference between the voltage measurement value and the voltage estimate value for the one point is minimized; and
For each measurement point, determining active power sensitivity according to the first parameter and determining reactive power sensitivity according to the second parameter,
A method of measuring voltage sensitivity, wherein the plurality of points include non-measurement points where power measurement values are not obtained. According to paragraph 4,
Further comprising the step of obtaining an incoming voltage measurement value of a power device connected to the one point,
In the step of calculating the voltage estimate value,
A voltage sensitivity measurement method that calculates a voltage estimate for a point by combining the incoming voltage measurement value of the point, the first sum, the second sum, and the third sum. A method of measuring the voltage sensitivity of one point in a busbar in which multiple power devices are connected to multiple points. Because,
Among the plurality of points, active power measurement values, reactive power measurement values, power phase angle measurement values, voltage measurement values, and incoming voltage measurement values for N measurement points (N is a natural number of 2 or more) acquiring;
Obtaining a voltage measurement value at the one point;
The sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point (first sum) 2 sum), the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (third sum), and the sum of the differences between the voltage measurement value of each measurement point and the incoming voltage measurement value (fourth sum) Calculating an estimated voltage value for the one point using (sum);
adjusting the first parameter, the second parameter, and the third parameter so that the difference between the voltage measurement value and the voltage estimate value for the one point is minimized; and
For each measurement point, determining active power sensitivity according to the first parameter and determining reactive power sensitivity according to the second parameter,
A method of measuring voltage sensitivity, wherein the plurality of points include non-measurement points where power measurement values are not obtained. ◈Claim 7 was abandoned upon payment of the setup registration fee.◈ According to clause 6,
Further comprising the step of obtaining an incoming voltage measurement value of a power device connected to the one point,
In the step of calculating the voltage estimate value,
A voltage sensitivity measurement method in which a voltage estimate value for a point is calculated by combining the incoming voltage measurement value of the point, the first sum, the second sum, the third sum, and the fourth sum. According to clause 6,
In the step of adjusting the first parameter, the second parameter, and the third parameter,
A voltage sensitivity measurement method that adjusts the first parameter, the second parameter, and the third parameter using the least square method. In the device for measuring the voltage sensitivity of one point in a busbar where a plurality of power devices are each connected to a plurality of points,
A communication circuit that communicates with distributed controllers linked to N measurement points (N is a natural number greater than or equal to 2) among the plurality of points;
a data acquisition circuit that acquires the voltage measurement value and power phase angle measurement value of the one point and the active power measurement value and reactive power measurement value of each measurement point from the distributed controllers; and
The sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point (first sum) 2 sum) and the sum (third sum) of the products of the third parameter for each measurement point and the power phase angle of the point, calculate the voltage estimate for the point, and calculate the voltage estimate for the point. The first parameter, the second parameter, and the third parameter are adjusted to minimize the difference between the measured value and the voltage estimate value, and the active power sensitivity is determined for each measurement point according to the first parameter, and the second It includes a calculation circuit that determines reactive power sensitivity according to parameters,
The plurality of points include non-measurement points where power measurement values are not obtained. ◈Claim 10 was abandoned upon payment of the setup registration fee.◈ According to clause 9,
The data acquisition circuit acquires an incoming voltage measurement value of a power device connected to the one point,
The calculation circuit is a voltage sensitivity measuring device that calculates a voltage estimate value for the one point by combining the incoming end voltage measurement value of the one point, the first sum, the second sum, and the third sum. ◈Claim 11 was abandoned upon payment of the setup registration fee.◈ According to clause 10,
The data acquisition circuit generates M a data set including the active power measurements, the reactive power measurements, the voltage measurements, the power phase angle measurements, and the incoming voltage measurements (M is a natural number of 2 or more. ) obtained at different points in time,
The calculation circuit is a voltage sensitivity measuring device that adjusts the first parameter, the second parameter, and the third parameter for the M data sets. ◈Claim 12 was abandoned upon payment of the setup registration fee.◈ According to clause 11,
A voltage sensitivity measuring device wherein the calculation circuit adjusts the first parameter, the second parameter, and the third parameter using a least square method. In the device for measuring the voltage sensitivity of one point in a busbar where a plurality of power devices are each connected to a plurality of points,
A communication circuit that communicates with distributed controllers linked to N measurement points (N is a natural number greater than or equal to 2) among the plurality of points;
a data acquisition circuit that acquires the voltage measurement value of the one point and obtains the active power measurement value, reactive power measurement value, and power phase angle measurement value of each measurement point from the distributed controllers; and
The sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point (first sum) 2 sum) and the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (third sum) to calculate the voltage estimate for the one point, and the voltage for the one point The first parameter, the second parameter, and the third parameter are adjusted to minimize the difference between the measured value and the voltage estimate value, and the active power sensitivity is determined for each measurement point according to the first parameter, and the second It includes a calculation circuit that determines reactive power sensitivity according to parameters,
The plurality of points include non-measurement points where power measurement values are not obtained. ◈Claim 14 was abandoned upon payment of the setup registration fee.◈ According to clause 13,
The data acquisition circuit acquires an incoming voltage measurement value of a power device connected to the one point,
The calculation circuit is a voltage sensitivity measuring device that calculates a voltage estimate value for the one point by combining the incoming end voltage measurement value of the one point, the first sum, the second sum, and the third sum. In the device for measuring the voltage sensitivity of one point in a busbar where a plurality of power devices are each connected to a plurality of points,
A communication circuit that communicates with distributed controllers linked to N measurement points (N is a natural number greater than or equal to 2) among the plurality of points;
A data acquisition circuit that acquires the voltage measurement value of the one point and acquires the active power measurement value, reactive power measurement value, power phase angle measurement value, voltage measurement value, and incoming voltage measurement value of each measurement point from the distributed controllers. ; and
The sum of the products of the first parameter for each measurement point and the active power measurement value of each measurement point (first sum), the sum of the products of the second parameter for each measurement point and the reactive power measurement value of each measurement point (first sum) 2 sum), the sum of the products of the third parameter for each measurement point and the power phase angle of each measurement point (third sum), and the sum of the differences between the voltage measurement value of each measurement point and the incoming voltage measurement value (fourth sum) Calculate the voltage estimate value for the one point using (sum), and adjust the first parameter, the second parameter, and the third parameter so that the difference between the voltage measurement value and the voltage estimate value for the one point is minimized. And, for each measurement point, it includes a calculation circuit that determines active power sensitivity according to the first parameter and reactive power sensitivity according to the second parameter,
The plurality of points include non-measurement points where power measurement values are not obtained.

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