KR102603221B1 - Demand response calculation method and calculation device using compensated customer base load - Google Patents

Abstract

One embodiment includes calculating a customer-based load default value; Obtaining a value for the actual load; calculating a difference between the actual load and the customer-based load initial value in a demand response section; Separating high-frequency component values and low-frequency component values from the difference value; and calculating the demand response amount according to the low-frequency component value.

Description

Demand response calculation method and calculation device using compensated customer base load {DEMAND RESPONSE CALCULATION METHOD AND CALCULATION DEVICE USING COMPENSATED CUSTOMER BASE LOAD}

This embodiment relates to a demand response calculation method, and more specifically, to a technology for calculating the demand response amount using a compensated customer reference load.

Customer Base Load (CBL) is a value that represents the standard load line of the load - demand resource - participating in demand response. Demand response volume - demand response participation volume - represents the amount of change that occurs due to demand response compared to the existing electricity demand - standard load line -. In order to accurately determine the demand response volume, the standard load line - customer standard load - must be accurately measured. You need to figure it out.

Previously, the standard load line in demand response calculation was calculated using the following methods.

'High

'Low

'Middle

'Last Y days' method: A method of determining the average of the days (X) in the second half of the days (Y) on which there is no demand response signal as the standard load line.

In addition, moving average methods and regression methods were used to determine the standard load line, but the existing methods were relatively accurate in macroscopic predictions, but had difficulty in accurately estimating instantaneous load changes.

Against this background, the purpose of this embodiment is, in one aspect, to provide a technology for accurately calculating the customer reference load, which is the basis for calculating the demand response amount. In another aspect, the purpose of this embodiment is to provide a technique for reflecting short-cycle load changes in the calculation of customer reference load. In another aspect, the purpose of this embodiment is to provide a technique to increase the accuracy of demand response volume calculation using compensated customer reference load.

In order to achieve the above-described object, one embodiment includes calculating a customer-based load initial value; Obtaining a value for the actual load; calculating a difference between the actual load and the customer-based load initial value in a demand response section; Separating high-frequency component values and low-frequency component values from the difference value; and calculating the demand response amount according to the low-frequency component value.

The demand response calculation method may separate the high-frequency component value and the low-frequency component value through wavelet transform on the difference value in the step of separating the high-frequency component value and the low-frequency component value.

In the demand response calculation method, the customer standard load value can be determined by adding or subtracting the high frequency component value from the customer standard load initial value.

In the demand response calculation method, in the step of separating the high-frequency component value and the low-frequency component value, the first frequency component value corresponding to the direct current component value and the first frequency is extracted from the difference value and N ( N is a natural number of 2 or more) extracts the N-th frequency component value corresponding to the multiple, determines the direct current component value and the first frequency component value as the low-frequency component value, and sets the N-th frequency component value as the high-frequency component value. can be included in

The first frequency may correspond to a sampling frequency of the actual load.

In the demand response calculation method, the N can be determined at a level where the difference between the difference value and the sum of the high frequency component value and the low frequency component value is smaller than a reference value.

The demand response calculation method may further include updating the customer-based load default value according to the high-frequency component value.

The demand response calculation method can apply the updated customer-based load default value to the next demand response section.

The customer-based load default value can be calculated by a machine learning model.

Another embodiment includes a load acquirer that obtains a value for the actual load; A difference calculator that calculates the difference between the actual load and the customer standard load default value in the demand response section; a frequency component separator that separates the high-frequency component value and the low-frequency component value from the difference value; and a demand response calculation device that calculates the demand response quantity according to the low frequency component value.

The frequency component separator may separate the high frequency component value and the low frequency component value through wavelet transform on the difference value.

The demand response calculation device may further include a customer-based load calculator that calculates the customer-based load default value using a machine learning model.

The customer-based load calculator may update the customer-based load default value according to the high-frequency component value.

The frequency component separator extracts a direct current component value and a first frequency component value corresponding to the first frequency from the difference value, and extracts an N frequency component value corresponding to N (N is a natural number of 2 or more) times the first frequency. may be extracted, the direct current component value and the first frequency component value may be determined as the low frequency component value, and the Nth frequency component value may be included in the high frequency component value.

The first frequency may correspond to a sampling frequency of the actual load.

As described above, according to this embodiment, the customer reference load, which is the basis for calculating the demand response amount, can be accurately calculated. In addition, according to this embodiment, short-cycle load changes can be reflected in the calculation of the customer reference load, and the accuracy of the demand response amount calculation can be increased by using the compensated customer reference load.

1 is a configuration diagram of a demand response system according to an embodiment.
Figure 2 is a configuration diagram of a demand response calculation device 110 according to an embodiment.
Figure 3 is a diagram showing the reference load line error when the reference load line is not compensated.
Figure 4 is a diagram showing the demand response amount when calculated without compensating for the reference load line.
Figure 5 is a diagram illustrating calculating the demand response amount using a compensated customer reference load according to an embodiment.
Figure 6 is a flowchart of a demand response calculation method according to an embodiment.
Figure 7 is a diagram showing the actual load in a test to verify one embodiment.
Figure 8 is a diagram showing the customer standard load default value in a test to verify one embodiment.
FIG. 9 is a diagram showing the difference between the actual load in FIG. 7 and the customer standard load default value in FIG. 8, and the actual demand response amount.
Figure 10 is a diagram showing separation of high-frequency component values and low-frequency component values in a test according to one embodiment.
Figure 11 is a diagram showing compensation for a customer standard load value using high frequency component values in a test according to an 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 demand response system according to an embodiment.

Referring to FIG. 1, the demand response system 100 may include a demand response calculation device 110, a meter 120, and a load 130.

The load 130 may receive power (Pl) from the power grid. In addition, the meter 120 can measure the power (Pl) supplied to the load 130 and transmit the load measurement value (mPl) to the demand response calculation device 110.

The load 130 can adjust power usage in response to the demand response signal. For example, the load 130 can reduce power usage in response to the demand response signal and increase power usage in response to the demand response signal. For convenience of explanation, the following description will focus on an example in which the load 130 reduces power usage in response to a demand response signal.

The demand response amount can be calculated by subtracting the actual load from the load that would have been used if there had been no demand response signal - the customer standard load value. In order for the demand response amount to be accurately calculated in this way, the customer reference load value needs to be accurately calculated.

The demand response calculation device 110 can calculate the customer-based load default value and separate the difference between the actual load and the customer-based load default value in the demand response section into a high-frequency component value and a low-frequency component value. In addition, the demand response calculation device 110 can calculate a more accurate customer standard load value by reflecting the high frequency component value in the customer standard load initial value. In addition, the demand response calculation device 110 can more accurately calculate the demand response amount using the low-frequency component value.

According to research, demand response quantity has the characteristic of changing in a slow cycle. Therefore, the low-frequency component value of the above-mentioned difference value can be understood as representing the demand response amount. And, the remaining high frequency component value in the difference value can be understood as the characteristics of the actual load and as a value that should be reflected in the customer standard load.

Figure 2 is a configuration diagram of a demand response calculation device 110 according to an embodiment.

Referring to FIG. 2, the demand response calculation device 110 includes a load acquirer 210, a difference calculator 220, a frequency component separator 230, a demand response calculator 240, and a customer standard load calculator 250. may include.

The load acquirer 210 may include a meter or obtain a value for the actual load by receiving a load measurement value from the meter. The load acquirer 210 further includes a communication circuit and can obtain a value for the actual load from the meter through communication.

The difference calculator 220 can calculate the difference between the actual load and the customer standard load default value in the demand response section.

The difference calculator 220 can recognize the demand response section by checking the demand response signal. The demand response signal may be created in the demand response calculation device 110 and then transmitted to the load. In this case, the difference calculator 220 can recognize the demand response section by checking the demand response signal generated internally. The demand response calculation device 110 may receive a demand response signal from a load or a demand response signal from a demand response management device. In this case, the difference calculator 220 can recognize the demand response section by checking the demand response signal transmitted from the outside.

The difference calculator 220 can calculate the difference value by subtracting the actual load amount from the customer standard load default value. The difference value may be an absolute value that does not include a sign.

The frequency component separator 230 can separate the high-frequency component value and the low-frequency component value from the difference value.

The frequency component separator 230 can separate high-frequency component values and low-frequency component values through wavelet transform on the difference value.

The frequency component separator 230 calculates the direct current component value, the first frequency component value corresponding to the first frequency, and the second to Nth (N is a natural number of 2 or more) frequency component values through wavelet transform on the difference value. You can.

The first frequency may be the same as the sampling frequency at the meter. And, the N-th frequency corresponding to the N-th frequency component value may be a frequency 2^(N-1) times the first frequency. For example, the second frequency may be twice the first frequency, the third frequency may be four times the first frequency, and the fourth frequency may be eight times the first frequency.

The frequency component separator 230 can calculate the response difference of the wavelet transform and determine N at a level where the response difference is smaller than the reference value. The response difference can be calculated by subtracting the total of each component value from the above-mentioned difference value. For example, the frequency component separator 230 calculates the total of each component value by adding the direct current component value and the first to Nth frequency component values, and calculates the response difference by subtracting the sum of each component value from the difference value. .

The frequency component separator 230 may increase the N value by one when the response difference is greater than the reference value. For example, when N is 3, if the response difference is greater than the reference value, the frequency component separator 230 may increase N to 4, recalculate the response difference, and compare the response difference with the reference value.

The demand response quantity calculator 240 can calculate the demand response quantity according to the low frequency component value. For example, the demand response quantity calculator 240 can calculate the demand response quantity by combining the direct current component value and the first frequency component value. Depending on the embodiment, the demand response amount calculator 240 may calculate the demand response amount by combining the direct current component value, the first frequency component value, and the second frequency component value.

The customer standard load calculator 250 can determine the customer standard load value by adding or subtracting the high frequency component value from the customer standard load initial value. For example, the customer standard load calculator 250 may calculate the high frequency component value by adding the second to Nth frequency component values, and calculate the customer standard load value by subtracting the high frequency component value from the customer standard load initial value. Depending on the embodiment, the customer standard load calculator 250 may calculate the high frequency component value by adding the third to Nth frequency component values, and calculate the customer standard load value by subtracting the high frequency component value from the customer standard load initial value.

If the demand response section is repeated in a similar time period, the customer reference load calculator 250 may update the customer reference load default value according to the high frequency component value and apply the updated customer reference load default value to the next demand response section.

The customer standard load calculator 250 can learn the customer standard load default value using machine learning - for example, artificial intelligence neural network. The customer standard load calculator 250 can calculate the customer standard load default value using a machine learning model created through such learning.

Figure 3 is a diagram showing the reference load line error when the reference load line is not compensated.

Referring to FIG. 3, the prior art can calculate the reference load line 330 using the actual load amount 310 in the first time period T1. In the prior art, the reference load line 330 can be calculated by averaging the actual load 310 in the first time period T1.

And, in the prior art, the reference load line 330 can be set as the reference value of the demand response amount in the second time period (T2). However, referring to FIG. 3, when there is no demand response signal, the actual load 310 creates a certain error 320 with the reference load line 330 in the second time period (T2). From the perspective of a person participating in demand response, such error 320 may result in a loss in that the amount of demand response is reduced and compensation for demand response is reduced.

Figure 4 is a diagram showing the demand response amount when calculated without compensating for the reference load line.

Referring to FIG. 4, the prior art can calculate the reference load line 420 using the actual load amount 410 in the third time period T3. In the prior art, the reference load line 420 can be calculated by averaging the actual load 410 in the third time period T3.

In addition, in the prior art, the demand response amount 430 can be calculated by calculating the difference between the reference load line 420 and the actual load amount 410 in the fourth time period T4.

However, as can be seen by checking the high-frequency variation of the actual load 410 in the fourth time section (T4), the reference load line 420 does not reflect the actual load that fluctuates at a rapid cycle, and thus, the conventional technology and The demand response quantity 430 calculated together may produce an error greater than a certain level from the actual demand response quantity.

Figure 5 is a diagram illustrating calculating the demand response amount using a compensated customer reference load according to an embodiment.

Referring to FIG. 5, the demand response calculation device according to an embodiment may calculate the customer-based load initial value 510 according to the actual load 410 in the third time period T3. For example, the demand response calculation device may calculate the customer-based load default value 510 by averaging the actual load 410 in the third time period T3.

In addition, the demand response calculation device uses the high-frequency component value of the actual load 410 or the high-frequency component value of the difference between the actual load 410 and the customer standard load default value 510 in the fourth time period (T4). The customer standard load value 520 can be calculated by calculating the compensation value and reflecting the compensation value in the customer standard load initial value 510. For example, the demand response calculation device may calculate the customer standard load value 520 by adding the high frequency component value of the actual load 410 to the customer standard load initial value 510 in the fourth time period T4. Alternatively, the demand response calculation device calculates the high-frequency component value for the difference between the customer-based load default value (510) and the actual load (410) in the fourth time period (T4), and sets the high-frequency component value to the customer-based load default value (510). The customer reference load value (520) can be calculated by subtracting the component values.

In addition, the demand response calculation device can calculate the demand response amount 530 according to the difference between the compensated customer reference load value 520 and the actual load amount 410.

Comparing Figures 4 and 5, it can be seen that there is a difference in the calculated demand response quantity, and it can be seen that the demand response quantity calculated according to one embodiment is more accurate than the demand response quantity calculated according to the prior art.

Figure 6 is a flowchart of a demand response calculation method according to an embodiment.

Referring to FIG. 6, the device can calculate the customer reference load (CBL) basic value (S600). The device can calculate the customer standard load default value using a machine learning model learned through an artificial intelligence neural network. Alternatively, the customer standard load default value can be calculated using the average value of the actual load in the section where there is no demand response signal.

The device can obtain a value for the actual load (S602). The device can obtain the value of the actual load through communication with the meter or with the load.

The device can calculate the difference between the customer-based load initial value and the actual load in the demand response section (S604). The device can recognize the demand response section according to the demand response signal and calculate the difference value by subtracting the actual load from the customer-based load default value in the demand response section.

The device can separate the high-frequency component value and the low-frequency component value from the difference value (S606). The device can separate high-frequency component values and low-frequency component values through wavelet transform on the difference value.

Additionally, the device can calculate the demand response (DR) amount using the low-frequency component value (S608). Here, the low-frequency component value may include a direct current component value and/or a first frequency component value.

Then, the device can calculate the compensation value using the high frequency component value (S610). Here, the high frequency component value may be a component value of frequencies corresponding to the fundamental frequency and the multiple frequency of the first frequency.

Then, the device can determine the customer-based load (CBL) value or update the customer-based load default value using the compensation value (S612).

FIG. 7 is a diagram showing the actual load in a test to verify an embodiment, FIG. 8 is a diagram showing the customer standard load default value in a test to verify an embodiment, and FIG. 9 is a diagram showing the actual load in FIG. 7. This is a diagram showing the difference between the load and the customer standard load default value of FIG. 8, and the actual demand response amount.

Referring to Figures 7 to 9, it can be seen that there is an error in the difference between the actual load and the customer standard load default value (see Net Load - Predicted CBL in Figure 9) and the actual demand response (see Actual DR in Figure 9). there is. And, it can be confirmed that the error is a high-frequency component.

Figure 10 is a diagram showing separation of high-frequency component values and low-frequency component values in a test according to one embodiment.

Referring to FIG. 10, the inventor calculated the difference between the actual load and the customer standard load initial value as shown in (a) of FIG. 10 in the test, and calculated this into the low frequency component value as shown in (b) of FIG. 10 and (c) of FIG. 10. ) were separated into high-frequency component values.

As can be seen by comparing "Actual DR" in (b) of Figure 10 and Figure 9 of Figure 9, the low-frequency component value separated from the difference between the actual load and the customer standard load initial value is very similar to the actual demand response amount. You can check that.

The high-frequency component value in the difference between the actual load and the customer standard load initial value can be viewed as the error value of the customer standard load value.

Figure 11 is a diagram showing compensation for a customer standard load value using high frequency component values in a test according to an embodiment.

Referring to FIG. 11, the compensation value shown in (b) of FIG. 11 - the high frequency component value extracted as shown in (c) of FIG. 10 - is added to or subtracted from the customer standard load default value shown in (a) of FIG. 11. An updated customer reference load value such as (c) in can be created.

As described above, according to this embodiment, the customer reference load, which is the basis for calculating the demand response amount, can be accurately calculated. In addition, according to this embodiment, short-cycle load changes can be reflected in the calculation of the customer reference load, and the accuracy of the demand response amount calculation can be increased by using the compensated customer reference load.

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.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

Claims (15)

Calculating a customer-based load initial value;
Obtaining a value for the actual load;
calculating a difference between the actual load and the customer-based load initial value in a demand response section;
Separating high-frequency component values and low-frequency component values from the difference value; and
Comprising a step of calculating the demand response quantity according to the low frequency component value,
In the step of separating the high-frequency component value and the low-frequency component value,
From the difference value, a direct current component value and a first frequency component value corresponding to the first frequency are extracted, and an N frequency component value corresponding to N (N is a natural number of 2 or more) times the first frequency is extracted,
Determining the direct current component value and the first frequency component value as the low frequency component value, and including the Nth frequency component value in the high frequency component value,
The first frequency is a demand response calculation method that corresponds to the sampling frequency of the actual load. According to paragraph 1,
In the step of separating the high-frequency component value and the low-frequency component value,
A demand response calculation method that separates the high-frequency component value and the low-frequency component value through wavelet transform for the difference value. According to paragraph 1,
A demand response calculation method that determines the customer standard load value by adding or subtracting the high frequency component value from the customer standard load initial value. delete delete According to paragraph 1,
A demand response calculation method in which the N is determined at a level where the difference between the difference value and the sum of the high frequency component value and the low frequency component value is smaller than a reference value. According to paragraph 1,
A demand response calculation method further comprising updating the customer standard load initial value according to the high frequency component value. In clause 7,
A demand response calculation method that applies the updated customer-based load default value to the next demand response section. ◈Claim 9 was abandoned upon payment of the setup registration fee.◈ According to paragraph 1,
A demand response calculation method in which the customer-based load default value is calculated by a machine learning model. A load acquirer that obtains a value for the actual load;
A difference calculator that calculates the difference between the actual load and the customer standard load default value in the demand response section;
a frequency component separator that separates the high-frequency component value and the low-frequency component value from the difference value; and
It includes a demand response quantity calculator that calculates the demand response quantity according to the low frequency component value,
The frequency component separator is,
From the difference value, a direct current component value and a first frequency component value corresponding to the first frequency are extracted, and an N frequency component value corresponding to N (N is a natural number of 2 or more) times the first frequency is extracted,
Determining the direct current component value and the first frequency component value as the low frequency component value, and including the Nth frequency component value in the high frequency component value,
The first frequency corresponds to the sampling frequency of the actual load. According to clause 10,
The frequency component separator is,
A demand response calculation device that separates the high-frequency component value and the low-frequency component value through wavelet transform for the difference value. According to clause 10,
A demand response calculation device further comprising a customer-based load calculator that calculates the customer-based load initial value using a machine learning model. According to clause 12,
The customer standard load calculator is,
A demand response calculation device that updates the customer standard load default value according to the high frequency component value. delete delete

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