Distributed photovoltaic output decomposition method and system for power distribution network

Abstract

The invention discloses a distributed photovoltaic output decomposition method and system for a power distribution network, and belongs to the technical field of operation sensing of the power distribution network, and the method comprises the steps: collecting a total power data sequence Pt of a transformer area at each hourly moment on the same day and a photovoltaic output data sequence Pv1 of a single photovoltaic unit in the transformer area; obtaining a final photovoltaic multiplying power according to a formula # imgabs0 #, and obtaining a photovoltaic output decomposition result in the transformer area; obtaining a single photovoltaic output slope KPv1 in a set output time period, gradually increasing the photovoltaic multiplying power a according to a set initial value of the photovoltaic multiplying power a and a step length delta a, and obtaining a transformer area equivalent total load slope KPL in the set output time period until the condition that KPL is less than KPv1 and the value of the photovoltaic multiplying power a is a1 is met; on the basis of the coefficient a1 and the step length delta a, the photovoltaic multiplying power a is gradually increased, the transformer area equivalent total load slope KPL in the set output time period is obtained till the condition that KPL is larger than KPv1 is met, and a2 = a-delta a at the moment. According to the invention, all photovoltaic output values can be rapidly obtained, and the problems of too much required data and complex calculation are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of operation perception of distribution networks, and particularly relates to a method and system for decomposing distributed photovoltaic output in a distribution network. Background Art

[0002] Photovoltaic power generation has the advantages of simple installation and maintenance, flexible configuration, and no geographical location restrictions, and has achieved rapid growth in recent years. Photovoltaic power generation systems are divided into two categories according to the installation scale: centralized photovoltaics and distributed photovoltaics. Centralized photovoltaics have a large installation capacity and relatively stable photovoltaic output, but the electric energy needs to be transmitted through long-distance transmission lines, resulting in problems such as line losses and voltage drops. Distributed photovoltaics have a smaller installation capacity than centralized photovoltaics, can generate electricity nearby, be used nearby, and feed the surplus electricity into the grid, reducing the transmission loss of electric energy, and are a powerful supplement and effective support for the large grid.

[0003] Distributed photovoltaic access to the distribution network is a common operation mode of distributed photovoltaics. Due to the needs of power balance, safe operation of the distribution network, and capacity management, the grid urgently needs to monitor distributed photovoltaics in the distribution substation area. However, on the one hand, the photovoltaic information standard in the distribution substation area is lacking, and it is sensitive to the cost of information collection and communication. On the other hand, the low maintenance level leads to poor quality of monitoring data and cannot meet the photovoltaic monitoring requirements. Therefore, it is often impossible to directly obtain the perception of distributed photovoltaic output in the distribution substation area. In the existing research on the perception of distributed photovoltaic output in the distribution substation area, there are two implementation means. One is to decompose the photovoltaic output according to the load characteristics in the substation area, such as achieving decomposition by using non-intrusive load monitoring, but this method requires the installation of additional equipment. The other is to use deep learning to separate the photovoltaic output, which requires the accumulation of a certain amount of measurement data and is difficult to apply in practice.

[0004] How to simply and quickly decompose the distributed photovoltaic output in the distribution substation area has become an urgent technical problem for those skilled in the art. For this reason, the present invention proposes a method for decomposing distributed photovoltaic output in a distribution network based on the comparison of photovoltaic output characteristics and load curve characteristics. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method and system for decomposing distributed photovoltaic output in a distribution network, which can quickly obtain all photovoltaic output values and solve the problems of excessive data requirements and complex calculations in the perception of distributed photovoltaic output in traditional distribution substations with distributed photovoltaics.

[0006] The present invention provides the following technical solutions:

[0007] In a first aspect, a method for decomposing distributed photovoltaic output in a distribution network is provided, including:

[0008] Collect the total power data sequence P of the substation area to be decomposed at each whole hour of the day t and the photovoltaic output data sequence P of any distributed photovoltaic in the substation area to be decomposed at each whole hour of the day v1 ;

[0009] According to the formula Obtain the final photovoltaic magnification a final and, according to the final photovoltaic magnification a final and the single photovoltaic output data sequence P v1 Obtain the decomposition result of the photovoltaic output in the substation area;

[0010] The method for obtaining the coefficient a1 is: obtain the slope K of the single photovoltaic output in the set output time period Pv1 , set the initial value of the photovoltaic magnification a and the value of the fixed step size Δa. According to the initial value of the photovoltaic magnification a and the fixed step size Δa, gradually increase the photovoltaic magnification a, and based on the current photovoltaic magnification and the total power data sequence P t Obtain the equivalent total load sequence P of the substation area L and the slope K of the equivalent total load of the substation area in the set output time period PL , until |K PL | < |K Pv1 |, pause the adjustment of the photovoltaic magnification. At this time, the value of the photovoltaic magnification a is a1;

[0011] The method for obtaining the coefficient a2 is: based on the coefficient a1 and the fixed step size Δa, gradually increase the photovoltaic magnification a, and obtain the slope K of the equivalent total load of the substation area in the set output time period PL , until |K PL | > |K Pv1 |. At this time, a2 = a - Δa.

[0012] Optionally, one of the end time points of the set output time period is the moment of the strongest photovoltaic output, and the other end time point is the moment when the photovoltaic does not output, and the moment when the photovoltaic does not output is the moment when the photovoltaic is about to change from non-output to output or the moment when the photovoltaic is about to change from output to non-output.

[0013] Optionally, the set output time period is 6:00 - 13:00 or 13:00 - 18:00 in daylight saving time, and 7:00 - 13:00 or 13:00 - 17:00 in winter time.

[0014] Optionally, the initial value of the photovoltaic magnification a is set to 1, and the set fixed step size Δa does not exceed 0.1.

[0015] Optionally, the method for obtaining the slope K of the single photovoltaic output in the set output time period Pv1 , the formula is:

[0016] K Pv1 =(Pv1 (t i )-P v1 (t j )) / (t i -t j )

[0017] where t i and t j are the two end times of the set output time period respectively, and P v1 (t i ) and P v1 (t j ) are the PV output data at times t i and t j respectively.

[0018] Optionally, based on the current PV magnification and the total power data sequence P t obtain the total equivalent load sequence P L of the substation area and the slope K PL of the total equivalent load of the substation area in the set output time period, specifically:

[0019] P L (t n ) = P t (t n ) + a × P v1 (t n )

[0020] where P L (t n ), P t (t n ) and P v1 (t n ) are the total equivalent load of the substation area, the total power of the substation area and the single PV output data at time t n respectively, and t n is any integer time from 1 to 24;

[0021] K PL = (P L (t i ) - P L (t j )) / (t i - t j )

[0022] where t i and t j are the two end times of the set output time period respectively, and P L (t i ) and P L (t j ) are at times t i and tj Total equivalent load of the substation area at a moment.

[0023] Optionally, according to the final photovoltaic magnification a final and the single-unit photovoltaic output data sequence P v1 Obtain the decomposed result P of the photovoltaic output in the substation area vtotal , and the formula is: P vtotal = a final ×P v1 .

[0024] Second, a distributed photovoltaic output decomposition system for a distribution network is provided, including:

[0025] A data acquisition module for collecting the total power data sequence P of the substation area to be decomposed at each whole-hour moment on the same day t and the photovoltaic output data sequence P of any distributed photovoltaic in the substation area to be decomposed at each whole-hour moment on the same day v1 ;

[0026] A decomposition module for obtaining the final photovoltaic magnification a according to the formula , and obtaining the decomposed result of the photovoltaic output in the substation area according to the final photovoltaic magnification a final and the single-unit photovoltaic output data sequence P final ; v1 A coefficient a1 acquisition unit: obtain the slope K of the single-unit photovoltaic output in the set output time period

[0027] , set the initial value of the photovoltaic magnification a and the value of the fixed step size Δa, gradually increase the photovoltaic magnification a according to the initial value of the photovoltaic magnification a and the fixed step size Δa, and based on the current photovoltaic magnification and the total power data sequence P Pv1 obtain the total equivalent load sequence P of the substation area t and the slope K of the total equivalent load of the substation area in the set output time period L , until |K PL | < |K PL |, pause the adjustment of the photovoltaic magnification, and at this time the value of the photovoltaic magnification a is a1; Pv1 A coefficient a2 acquisition unit: based on the coefficient a1 and the fixed step size Δa, gradually increase the photovoltaic magnification a, and obtain the slope K of the total equivalent load of the substation area in the set output time period

[0028] , until |K PL | > |K PL |, and at this time a2 = a - Δa. Pv1

[0029] In a third aspect, a computer device is provided, including a processor and a memory; wherein, when the processor executes the computer program stored in the memory, the steps of the distributed photovoltaic output decomposition method for a distribution network described in any one of the first aspects are implemented.

[0030] In a fourth aspect, a computer-readable storage medium is provided for storing a computer program; when the computer program is executed by a processor, the steps of the distributed photovoltaic output decomposition method for a distribution network described in any one of the first aspects are implemented.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] In this application, by calculating the slope of the output of a single photovoltaic unit and the slope of the equivalent total load in the substation area, the final photovoltaic magnification is determined, and the total photovoltaic output in the substation area is calculated to achieve the decomposition of photovoltaic output, making the perception of photovoltaic output simpler and faster. In addition, this application only requires the total power data sequence of the low-voltage side of the transformer at the whole hour of 24 hours a day in the substation area and the photovoltaic output data sequence of a certain photovoltaic unit at 24 hours a whole point to perceive the total photovoltaic output in the substation area, requiring less data and greatly reducing the calculation amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a flowchart of the distributed photovoltaic output decomposition method for a distribution network of the present invention;

[0034] Figure 2 is the total power data sequence P of the low-voltage side main meter read in Embodiment 2 of the present invention t and the photovoltaic output data sequence P of a certain distributed photovoltaic unit in the substation area v1 schematic diagram;

[0035] Figure 3 is a schematic diagram of the photovoltaic output decomposition result in Embodiment 2 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The present invention will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention. It should be noted that the term "including" and any deformation thereof in the description and claims of the present invention and the above drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0037] Embodiment 1

[0038] As Figure 1 shown, a distributed photovoltaic output decomposition method for a distribution network is provided, including:

[0039] Step 1: Collect the total power data sequence P of the substation area to be decomposed at each whole hour of the day t and the photovoltaic output data sequence P of any distributed photovoltaic in the substation area to be decomposed at each whole hour of the day v1 .

[0040] The collection of the total power of the substation area to be decomposed at each whole hour of the day (the whole hours from 1 o'clock to 24 o'clock) can be directly obtained by reading the total power meter on the low-voltage side of the substation transformer. The photovoltaic output data sequence P of any distributed photovoltaic in the substation area to be decomposed at each whole hour of the day (the whole hours from 1 o'clock to 24 o'clock) v1 can be collected by reading the power meter of a single photovoltaic, that is, the photovoltaic output data is the power generation power of a single photovoltaic.

[0041] Step 2: According to the formula Obtain the final photovoltaic magnification a final , and according to the final photovoltaic magnification a final and the single photovoltaic output data sequence P v1 Obtain the decomposition result of the photovoltaic output in the substation area.

[0042] The way to obtain the coefficient a1 is as follows: Obtain the slope K of the output of a single photovoltaic in the set output time period Pv1 , set the initial value of the photovoltaic magnification a and the value of the fixed step size Δa. According to the initial value of the photovoltaic magnification a and the fixed step size Δa, gradually increase the photovoltaic magnification a, and based on the current photovoltaic magnification and the total power data sequence P t Obtain the equivalent total load sequence P of the substation area L and the slope K of the equivalent total load of the substation area in the set output time period PL , until |K PL | < |K Pv1 |, pause the adjustment of the photovoltaic magnification, and at this time the value of the photovoltaic magnification a is a1.

[0043] The way to obtain the coefficient a2 is as follows: Based on the coefficient a1 and the fixed step size Δa, gradually increase the photovoltaic magnification a, and obtain the slope K of the equivalent total load of the substation area in the set output time period PL , until |K PL | > |K Pv1 |, at this time a2 = a - Δa.

[0044] Specifically, Step 2 may include the following sub-steps

[0045] Step 2.1: Set the initial value of the photovoltaic magnification a and the fixed step size Δa

[0046] Specifically, the initial value of the photovoltaic magnification a is set to 1, and the set fixed step size Δa does not exceed 0.1

[0047] Step 2.2: According to the photovoltaic output data sequence P of any distributed photovoltaic in the substation area to be decomposed at each whole-hour moment of the day v1 , obtain the slope K of the single-photovoltaic output data in the set output time period Pv1 .

[0048] One of the end moments of the set output time period is the moment of the strongest photovoltaic output, and the other end moment is the moment when the photovoltaic does not output, and the moment when the photovoltaic does not output is the moment when the photovoltaic is about to change from non-output to output or the moment when the photovoltaic is about to change from output to non-output.

[0049] Generally, the set output time period is from 6:00 to 13:00 or from 13:00 to 18:00 in daylight saving time, and from 7:00 to 13:00 or from 13:00 to 17:00 in winter time.

[0050] Specifically, obtain the slope K of the single-photovoltaic output in the set output time period Pv1 , and the formula is:[[]]

[0051] K Pv1 =(P v1 (t i ) - P v1 (t j )) / (t i - t j )

[0052] Wherein, t i and t j are respectively the two end moments of the set output time period, and P v1 (t i ) and P v1 (t j ) are respectively the photovoltaic output data at the moments of t i and t j .

[0053] Step 2.3: According to the total power data P t , the photovoltaic output data P v1 and the current photovoltaic magnification a, obtain the equivalent total load P L of each whole-hour moment in the substation area.

[0054] Specifically:[[]]

[0055] P L (t n ) = P t (t n ) + a × P v1 (t n )

[0056] Wherein, P L (tn ), P t (t n ) and P v1 (t n ) are t n The total equivalent load, total power and single photovoltaic output data of the area at the time t n Any hour from 1 to 24.

[0057] Step 2.4: Based on the equivalent total load P at each hour L , obtain the equivalent total load slope K of the area in the set output time period PL .

[0058] Specifically:

[0059] K PL =(P L (t i )-P L (t j )) / (t i -t j )

[0060] Among them, t i and t j are the two end points of the output time period, P L (t i ) and P L (t j ) are t i and t j The equivalent total load of the substation at the moment.

[0061] Step 2.5: Determine |K PL |with|K Pv1 | size relationship, if |K PL |<|K Pv1 |If it does not hold, take a=a+Δa and return to step 2.3; otherwise, go to step 2.6.

[0062] Step 2.6: Record the current photovoltaic ratio a and make the coefficient a1=a.

[0063] Step 2.7: Based on the total power data P t , Photovoltaic output data P v1 and the current photovoltaic multiple a, obtain the equivalent total load P at each hour in the area L .

[0064] Specifically:

[0065] P L (t n )=P t (tn ) + a × P v1 (t n )

[0066] Among them, P L (t n ), P t (t n ) and P v1 (t n ) are the total equivalent load of the substation area, the total power of the substation area, and the single - unit PV output data at time t respectively, where t n is any whole - point time from 1 to 24. n

[0067] Step 2.8: Judge the magnitude relationship between |K PL | and |K Pv1 |. If |K PL | > |K Pv1 | does not hold, then take a = a + Δa and return to Step 2.7; otherwise, enter Step 2.9.

[0068] Step 2.9: Record the value of the current PV magnification a, and make the coefficient a2 = a - Δa.

[0069] Step 2.10: Obtain the final PV magnification a according to the formula final .

[0070] Step 2.11: According to the final PV magnification a final and the single - unit PV output data sequence P v1 , according to the formula P vtotal = a final ×P v1 obtain the PV output decomposition result P vtotal in the substation area.

[0071] This application determines the final PV magnification by calculating the slopes of the single - unit PV output and the total equivalent load of the substation area, calculates the total PV output in the substation area, realizes the decomposition of PV output, making the perception of PV output simpler and faster. In addition, this application only requires the total power data sequence of the low - voltage side of the transformer in the substation area at 24 whole - point times in a day and the PV output data sequence of a certain PV unit at 24 whole - point times to sense the total PV output in the substation area, requiring less data and greatly reducing the calculation amount.

[0072] Embodiment 2

[0073] Provide a specific example of PV decomposition in a distribution substation area according to the method for decomposing distributed PV output in a distribution network of this application.

[0074] In Step 1, read the power data sequence P of the total meter at the low - voltage side of the substation transformer from 1 o'clock to 24 o'clock whole - point​t The photovoltaic output data sequence P of a certain distributed photovoltaic at a certain point in the substation area from 1 o'clock to 24 o'clock v1 , and the read data results are shown in Table 1 and Figure 2 as follows. The read P t In the data, the values between 9:00 and 15:00 are negative, indicating that there is power reverse transmission in the substation area.

[0075] Table 1 Read P t and P v1 value

[0076] moment 1：00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 <![CDATA[P t (MW)]]> 1.472 1.6 1.664 2.048 2.56 2.542 1.95 0.39 <![CDATA[P v1 (MW)]]> 0 0 0 0 0 0.03 0.12 0.5 moment 9：00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 <![CDATA[P t (MW)]]> -1.388 -1.982 -2.32 -2.614 -2.548 -1.857 -0.618 0.15 <![CDATA[P v1 (MW)]]> 0.9 1.05 1.2 1.22 1.25 1.115 0.99 0.75 moment 17：00 18:00 19:00 20:00 21:00 22:00 23:00 24:00 <![CDATA[P t (MW)]]> 1.511 3.606 4.308 3.456 2.56 1.92 1.536 1.28 <![CDATA[P v1 (MW)]]> 0.459 0.096 0 0 0 0 0 0

[0077] In step two, set the initial value of the photovoltaic magnification a to 1.0 and the step size Δa to 0.01.

[0078] In step three, calculate the equivalent total load sequence P t from 1 o'clock to 24 o'clock in the substation area from the power data sequence P v1 , the photovoltaic output data sequence P L , and the photovoltaic magnification a, and calculate P L according to the following formula

[0079] P L (t n ) = P t (t n ) + a × P v1 (t n )

[0080] The time point t n successively takes the integer point moment values from 1 to 24 to obtain P L as shown in Table 2.

[0081] Table 2 Calculated P L value (a = 1.0)

[0082] moment 1：00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 <![CDATA[P L (MW)]]> 1.472 1.6 1.664 2.048 2.56 2.572 2.07 0.89 moment 9：00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 <![CDATA[P L (MW)]]> -0.488 -0.932 -1.12 -1.394 -1.298 -0.742 0.372 0.90 moment 17：00 18:00 19:00 20:00 21:00 22:00 23:00 24:00 <![CDATA[P L (MW)]]> 1.97 3.702 4.308 3.456 2.56 1.92 1.536 1.28

[0083] In step four, calculate the slope K Pv1 of the single photovoltaic output and the slope K PL of the equivalent total load in the substation area, and the calculation formula is

[0084] K Pv1 = (P v1 (18) - P v1 (13)) / (18 - 13)

[0085] K PL = (P L (18) - P L (13)) / (18 - 13)

[0086] Calculate to obtain K Pv1 =-0.231, K PL =1.

[0087] In step five, judge the magnitude relationship between |K PL | and |K Pv1 |. If |K PL | < |K Pv1 | does not hold, then take a = a + Δa and return to step three. Otherwise, proceed to the next step. After iterative calculation, when a increases to 4.34, |K PL | < |K Pv1 | holds, and proceed to the next step.

[0088] In step six, record the value of a, and take the coefficient a1 = a, where a1 = 4.34.

[0089] In step seven, calculate the equivalent total load sequence P t from 1 to 24 at the substation area based on the power data sequence P v1 , the photovoltaic output data sequence P L , and the photovoltaic magnification a, and obtain P L when a = 4.34 as shown in Table 3.

[0090] Table 3 Calculated P L value (a = 4.34)

[0091] moment 1：00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 <![CDATA[P L (MW)]]> 1.472 1.60 1.664 2.048 2.56 2.672 2.471 2.56 moment 9：00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 <![CDATA[P L (MW)]]> 2.518 2.575 2.888 2.681 2.877 2.982 3.679 3.405 moment 17：00 18:00 19:00 20:00 21:00 22:00 23:00 24:00 <![CDATA[P L (MW)]]> 3.503 4.023 4.308 3.456 2.56 1.92 1.536 1.28

[0092] In step eight, calculate the slope K Pv1 of the single - unit photovoltaic output and the slope K PL of the equivalent total load of the substation area. According to the calculation formula, obtain K Pv1 =-0.231, K PL =0.229.

[0093] In step nine, judge the magnitude relationship between |K PL | and |K Pv1 |. If |K PL | > |K Pv1 | does not hold, then take a = a + Δa and return to step seven. Otherwise, proceed to the next step. After iterative calculation, when a increases to 6.34, |K PL | > |K Pv1 | holds, and proceed to the next step.

[0094] In step ten, record the value of a at this time, and take the coefficient a2 = a - Δa, where a2 = 6.33.

[0095] In step eleven, determine the final photovoltaic magnification afinal , a final =(a1 + a2) / 2 = 5.335, and calculate the decomposed result P of the photovoltaic output in the substation area vtotal , P vtotal = a final *P v1 , as shown in Table 4 and Figure 3 shown

[0096] Table 4 P vtotal Calculation result

[0097] moment 1：00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 <![CDATA[P vtotal (MW)]]> 0 0 0 0 0 0.16 0.640 2.668 moment 9：00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 <![CDATA[P vtotal (MW)]]> 4.802 5.602 6.402 6.509 6.669 5.949 5.282 4.001 moment 17：00 18:00 19:00 20:00 21:00 22:00 23:00 24:00 <![CDATA[P vtotal (MW)]]> 2.449 0.512 0 0 0 0 0 0

[0098] In the embodiment of the present invention, a calculation program is written in MATLAB, and the total power data sequence P of the low-voltage side of the transformer in the distribution substation area is manually input t and the photovoltaic output data sequence P of a distributed photovoltaic in the substation area v1 , and the decomposed result of the photovoltaic output can be quickly given, as Figure 3 shown. The error between the decomposed result of the photovoltaic output calculated by this application and all the actual photovoltaic output values is less than 12%.

[0099] Embodiment 3

[0100] Provide a distributed photovoltaic output decomposition system for a distribution network, including:

[0101] A data acquisition module for acquiring the total power data sequence P at each whole-hour moment of the substation area to be decomposed on the same day t and the photovoltaic output data sequence P of any distributed photovoltaic in the substation area to be decomposed at each whole-hour moment of the same day v1 ;

[0102] A decomposition module for obtaining the final photovoltaic magnification a according to the formula , and obtaining the decomposed result of the photovoltaic output in the substation area according to the final photovoltaic magnification a final and the single-photovoltaic output data sequence P final ; v1 A coefficient a1 acquisition unit: acquire the slope K of the single-photovoltaic output in the set output time period

[0103] , set the initial value of the photovoltaic magnification a and the value of the fixed step Δa, gradually increase the photovoltaic magnification a according to the initial value of the photovoltaic magnification a and the fixed step Δa, and based on the current photovoltaic magnification and the total power data sequence P Pv1 obtain the equivalent total load sequence P of the substation area t and the slope K of the equivalent total load of the substation area in the set output time period L , until |K PL | < |K PL | < |K Pv1|, suspend the adjustment of the photovoltaic magnification. At this time, the value of the photovoltaic magnification a is a1;

[0104] Coefficient a2 acquisition unit: Based on coefficient a1 and a fixed step size Δa, gradually increase the photovoltaic magnification a to obtain the total equivalent load slope K of the distribution transformer area during the set output period PL , until |K PL | > |K Pv1 |. At this time, a2 = a - Δa.

[0105] For a more specific process of the above method, reference can be made to the corresponding content disclosed in the foregoing embodiments, and details will not be elaborated here.

[0106] Embodiment 4

[0107] The present invention provides a computer device, including a processor and a memory; wherein, when the processor executes the computer program stored in the memory, the steps of the above distribution network distributed photovoltaic output decomposition method are implemented.

[0108] For a more specific process of the above method, reference can be made to the corresponding content disclosed in the foregoing embodiments, and details will not be elaborated here.

[0109] Embodiment 5

[0110] The present invention provides a computer-readable storage medium for storing a computer program; when the computer program is executed by a processor, the steps of the above distribution network distributed photovoltaic output decomposition method are implemented.

[0111] For a more specific process of the above method, reference can be made to the corresponding content disclosed in the foregoing embodiments, and details will not be elaborated here.

[0112] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the systems, devices, and storage media disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and the relevant parts can be referred to the description of the method part.

[0113] Those skilled in the art can clearly understand that the technologies in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solutions in the embodiments of the present invention, in essence, or the parts that contribute to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments of the present invention.

[0114] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should be regarded as within the protection scope of the present invention.

Claims

1. A method for decomposing the distributed photovoltaic output of a distribution network, characterized in that Including: Collect the total power data sequence P of the substation area to be decomposed at each whole hour of the day t and the photovoltaic output data sequence P of any distributed photovoltaic in the substation area to be decomposed at each whole hour of the day v1 ; According to the formula obtain the final photovoltaic magnification factor a final , and according to the final photovoltaic magnification factor a final and the single-unit photovoltaic output data sequence P v1 obtain the decomposition result of the photovoltaic output within the substation area; The method for obtaining the coefficient a1 is as follows: obtain the slope K of the single photovoltaic output during the set output time period Pv1 , set the initial value of the photovoltaic magnification a and the value of the fixed step size Δa. According to the initial value of the photovoltaic magnification a and the fixed step size Δa, gradually increase the photovoltaic magnification a, and based on the current photovoltaic magnification and the total power data sequence P t Obtain the equivalent total load sequence P of the substation area L and the slope K of the equivalent total load of the substation area during the set output time period PL , until |K PL | < |K Pv1 |, suspend the adjustment of the photovoltaic magnification. At this time, the value of the photovoltaic magnification a is a1; The acquisition method of coefficient a2 is as follows: Based on coefficient a1 and a fixed step size Δa, gradually increase the photovoltaic magnification a to obtain the total equivalent load slope K of the substation area in the set output time period. PL , until |K PL | > |K Pv1 |. At this time, a2 = a - Δa.

2. The method for decomposing the distributed photovoltaic output of a distribution network according to claim 1, wherein One of the endpoint moments of the set output time period is the moment of the strongest photovoltaic output, and the other endpoint moment is the moment when the photovoltaic does not output power, and the moment when the photovoltaic does not output power is the moment when the photovoltaic is about to change from non-output to output or the moment when the photovoltaic is about to change from output to non-output.

3. The method for decomposing the distributed photovoltaic output of the distribution network according to claim 2, wherein The set output time period is from 6:00 to 13:00 or from 13:00 to 18:00 in daylight saving time, and from 7:00 to 13:00 or from 13:00 to 17:00 in winter time.

4. The method for decomposing the distributed photovoltaic output of a distribution network according to claim 1, wherein, The initial value of the photovoltaic magnification a is set to 1, and the set fixed step size Δa does not exceed 0.

1.

5. The method for decomposing the distributed photovoltaic output of a distribution network according to claim 1, wherein The slope K of the single photovoltaic output power during the set output time period is obtained Pv1 , and the formula is: K Pv1 = (P v1 (t i ) - P v1 (t j )) / (t i - t j ) Among them, t i and t j are the two end times of the set output time period respectively, and P v1 (t i ) and P v1 (t j ) are the PV output data at times t i and t j respectively.

6. The method for decomposing the distributed photovoltaic output of a distribution network according to claim 1, wherein as described above and based on the current photovoltaic magnification factor and the total power data sequence P t obtain the equivalent total load sequence P of the substation area L and the equivalent total load slope K of the substation area during the set output time period PL specifically: P L (t n ) = P t (t n ) + a × P v1 (t n ) Among them, P L (t n ), P t (t n ), and P v1 (t n ) are the total equivalent load of the transformer area, the total power of the transformer area, and the single - unit PV output data at time t n respectively. t n is any whole - point time from 1 to 24; K PL = (P L (t i ) - P L (t j )) / (t i - t j ) where t i and t j are the two end times of the set output time period respectively, and P L (t i ) and P L (t j ) are the total equivalent loads of the substation area at times t i and t j respectively.

7. The method for decomposing the distributed photovoltaic output of a distribution network according to claim 1, characterized in that, as described and according to the final photovoltaic magnification factor a final and the single-unit photovoltaic output data sequence P v1 obtain the photovoltaic output decomposition result P within the substation area vtotal , and the formula is: P vtotal = a final × P v1 .

8. A distributed photovoltaic output decomposition system for a distribution network, characterized in that, Including: A data acquisition module, which is used to acquire the total power data sequence P of the substation area to be decomposed at each whole hour of the day t and the photovoltaic output data sequence P of any distributed photovoltaic in the substation area to be decomposed at each whole hour of the day v1 ; Decomposition module, used to obtain the final photovoltaic magnification factor a according to the formula and obtain the decomposed result of photovoltaic output in the substation area according to the final photovoltaic magnification factor a final and the single-unit photovoltaic output data sequence P final v1 ​​ Coefficient a1 acquisition unit: acquire the slope K of the single photovoltaic output during the set output time period Pv1 , set the initial value of the photovoltaic magnification a and the value of the fixed step size Δa, gradually increase the photovoltaic magnification a according to the initial value of the photovoltaic magnification a and the fixed step size Δa, and based on the current photovoltaic magnification and the total power data sequence P t acquire the equivalent total load sequence P of the power distribution area L and the slope K of the equivalent total load of the power distribution area during the set output time period PL , until |K PL | < |K Pv1 |, pause the adjustment of the photovoltaic magnification, and at this time the value of the photovoltaic magnification a is a1; Coefficient a2 acquisition unit: Based on coefficient a1 and a fixed step size Δa, gradually increase the photovoltaic magnification a to obtain the slope K of the equivalent total load in the set output time period of the substation area PL , until |K PL | > |K Pv1 |, at this time a2 = a - Δa.

9. A computer device, characterized in that, Including a processor and a memory; wherein, when the processor executes the computer program stored in the memory, the steps of the distribution network distributed photovoltaic output decomposition method described in any one of claims 1-7 are implemented.

10. A computer-readable storage medium, characterized in that, For storing a computer program; when the computer program is executed by the processor, the steps of the distribution network distributed photovoltaic output decomposition method described in any one of claims 1-7 are implemented.

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