A reactive power compensation control method and device for fishery-photovoltaic complementary

Abstract

The present invention discloses a reactive compensation control method and device for fish-photovoltaic complementarity. The method collects current voltage data, historical voltage data and photovoltaic surplus power of a fish pond load grid-connected point, and judges the current voltage data. If the current voltage data is greater than a first preset value or less than a second preset value, it is judged whether the number of voltage data greater than the first preset value or less than the second preset value in the historical voltage data reaches a preset number. If it reaches a preset number, the current voltage data is adjusted by a capacitor group to obtain adjusted current voltage data, and then the adjusted current voltage data is judged. If the adjusted current voltage data is greater than the first preset value or less than the first preset value, the adjusted current voltage data is adjusted by adjusting the photovoltaic power generation power. The voltage is adjusted by combining the fish pond and photovoltaic power generation, so that photovoltaic power generation and fish pond load are complemented, and the utilization efficiency of power grid resources is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fishery-photovoltaic complementarity, and in particular to a reactive power compensation control method and device for fishery-photovoltaic complementarity. Background Art

[0002] With the continuous development of fish pond farming industry, the area of ​​fish pond farming is increasing, and the electrical equipment in the fish pond is also increasing. Therefore, affected by economic benefits, the geographical location of the fish pond is gradually moving away from the load center, resulting in it being often located at the end of the power supply line. At the same time, most of the electrical equipment in the fish pond is reactive load, which further aggravates the risk of low voltage at the grid connection point.

[0003] With the development of photovoltaic power generation systems, their practicality has gradually increased. However, due to their high space requirements and the impact of economic benefits, they are often located in relatively remote areas, which makes their access lines often long-distance no-load grid-connected, and even become distributed power grid-connected lines. However, due to the characteristics of photovoltaic power generation, there is a risk of the grid voltage exceeding the upper limit. Summary of the invention

[0004] In order to solve the above technical problems, the embodiments of the present invention provide a reactive compensation control method and device for fish-photovoltaic complementarity, which combines fish ponds with photovoltaic power generation to achieve complementarity with fish pond loads and improve the utilization efficiency of power grid resources.

[0005] A first aspect of an embodiment of the present invention provides a reactive power compensation control method for fishery-photovoltaic complementarity, the method comprising:

[0006] S1: Collecting current voltage data, historical voltage data, capacitor operation status, photovoltaic power generation, power factor and photovoltaic surplus power generation of the fish pond load grid connection point, wherein the historical voltage data is the historical voltage data within a preset time period;

[0007] S2: judging the current voltage data, and if the current voltage data satisfies any one of the first adjustment conditions, executing S3, otherwise not adjusting the voltage, wherein the first adjustment condition includes if the voltage data is greater than a first preset value, and the number of voltage data greater than the first preset value in the historical voltage data is greater than or equal to the preset number; and if the voltage data is less than a second preset value, and the number of voltage data less than the second preset value in the historical voltage data is greater than or equal to the preset number;

[0008] S3: the current voltage data is regulated by switching the capacitor bank on or off to obtain an adjusted voltage. If the adjusted voltage satisfies any one of the second adjustment conditions, S4 is executed and the adjusted voltage is maintained. Otherwise, the voltage is not adjusted. The second adjustment condition includes if the capacitor bank is fully switched off and the adjusted voltage is greater than the first preset value; and if the capacitor bank is fully switched on and the adjusted voltage is less than the second preset value.

[0009] S4: Use photovoltaic power generation power and photovoltaic power generation power factor to regulate the adjusted voltage to obtain a final voltage. If the final voltage meets any one of the third adjustment conditions, the system will alarm, otherwise no voltage adjustment will be performed, wherein the third adjustment condition includes if the photovoltaic power generation power is less than or equal to the first power generation preset value, and the photovoltaic power generation power factor is greater than or equal to the first power factor value, and the final voltage is greater than the first preset value; and if the photovoltaic power generation power is greater than or equal to the second power generation preset value, and the photovoltaic power generation power factor is less than or equal to the second power factor value, and the final voltage is less than the second preset value.

[0010] In the implementation of this embodiment, the current voltage data, historical voltage data, capacitor operation status, photovoltaic power generation power, power factor and photovoltaic surplus power generation of the fish pond load grid point are collected, and the current voltage data is judged. If the current voltage data is greater than a first preset value, and the number of voltage data greater than the first preset value in the historical voltage data is greater than or equal to the preset number, or if the current voltage data is less than a second preset value, and the number of voltage data less than the second preset value in the historical voltage data is greater than or equal to the preset number, the current voltage data is regulated by switching the capacitor bank on or off to obtain an adjusted voltage. If the capacitor bank is fully switched off and the adjusted voltage is greater than the first preset value, or if the capacitor bank is fully switched on and the adjusted voltage is less than the second preset value, the current voltage data is regulated by switching the capacitor bank on or off to obtain an adjusted voltage. At the second preset value, the adjusted voltage is regulated by using the photovoltaic power generation power and the photovoltaic power generation power factor to obtain the final voltage. If the final voltage meets any one of the third adjustment conditions, the system will alarm, otherwise the voltage adjustment will not be performed, wherein the third adjustment condition includes if the photovoltaic power generation power is less than or equal to the first power generation preset value, and the photovoltaic power generation power factor is greater than or equal to the first power factor value, and the final voltage is greater than the first preset value; and if the photovoltaic power generation power is greater than or equal to the second power generation preset value, and the photovoltaic power generation power factor is less than or equal to the second power factor value, and the final voltage is less than the second preset value. This method adjusts the voltage by combining the fish pond and photovoltaic power generation, so that the photovoltaic power generation and the fish pond load are complementary, thereby improving the utilization efficiency of power grid resources.

[0011] In a possible implementation of the first aspect, the current voltage data is regulated by switching on or off the capacitor bank to obtain an adjusted voltage, specifically:

[0012] S31: if the current voltage data is greater than the first preset value, execute S32; if the current voltage data is less than the second preset value, execute S34; otherwise, do not perform voltage adjustment;

[0013] S32: If all the capacitor banks are cut out, no voltage adjustment is performed, otherwise S33 is executed;

[0014] S33: Cut out a group of the capacitor groups to adjust the current voltage data to obtain an adjusted voltage. If the adjusted voltage is greater than the first preset value, execute S32; otherwise, do not adjust the voltage.

[0015] S34: If the capacitor bank is fully operational, no voltage adjustment is performed, otherwise S35 is executed;

[0016] S35: Putting one group of the capacitor groups into use to adjust the current voltage data to obtain the adjusted voltage. If the adjusted voltage is less than the second preset value, executing S34, otherwise, no voltage adjustment is performed.

[0017] In a possible implementation of the first aspect, the adjusted voltage is regulated by using the photovoltaic power generation power and the photovoltaic power generation power factor to obtain a final voltage, specifically:

[0018] S41: if the adjusted voltage is greater than the first preset value, execute S42; if the adjusted voltage is less than the second preset value, execute S44; otherwise, do not adjust the voltage;

[0019] S42: If the photovoltaic power generation power is less than or equal to the first power generation preset value, execute S46, otherwise execute S43;

[0020] S43: after reducing the photovoltaic power generation power by one gear, adjusting the adjusted voltage data to obtain a final voltage, if the final voltage is greater than the first preset value, executing S42, otherwise, no voltage adjustment is performed;

[0021] S44: If the photovoltaic power generation power is greater than or equal to the second power generation preset value, execute S48, otherwise execute S45;

[0022] S45: after increasing the photovoltaic power generation power by one gear, adjusting the adjusted voltage data to obtain a final voltage, if the final voltage is less than the second preset value, executing S44, otherwise, not performing voltage adjustment;

[0023] S46: If the photovoltaic power generation power factor is greater than or equal to the first power factor, the system issues an alarm, otherwise executes S47;

[0024] S47: increasing the photovoltaic power factor by 0.1, adjusting the adjusted voltage data to obtain a final voltage, and if the final voltage is greater than the first preset value, executing S46, otherwise, not performing voltage adjustment;

[0025] S48: If the photovoltaic power factor is less than or equal to the second power factor, the system issues an alarm, otherwise executes S49;

[0026] S49: the photovoltaic power generation power factor is adjusted down by 0.1, and the adjusted voltage data is adjusted to obtain a final voltage. If the final voltage is less than the first preset value, S48 is executed, otherwise no voltage adjustment is performed.

[0027] In a possible implementation of the first aspect, the first power generation preset value is the minimum power generation value allowed by the photovoltaic power generation system, the second power generation preset value is the maximum power generation value allowed by the photovoltaic power generation system, the first power factor value is the maximum power generation factor value allowed by the photovoltaic power generation system, and the second power factor value is the minimum power generation factor value allowed by the photovoltaic power generation system.

[0028] In a possible implementation manner of the first aspect, the preset number is specifically:

[0029] The preset number is set to 0.5 times the number of historical voltage data.

[0030] A second aspect of an embodiment of the present invention provides a reactive power compensation control device for fishery-photovoltaic complementarity, the device comprising:

[0031] A collection module is used to collect current voltage data, historical voltage data, capacitor operation status, photovoltaic power generation, power factor and photovoltaic surplus power generation of the fish pond load grid connection point, wherein the historical voltage data is the historical voltage data within a preset time period;

[0032] A first judgment module is used to judge the current voltage data, and if the current voltage data satisfies any one of the first adjustment conditions, S3 is executed, otherwise the voltage adjustment is not performed, wherein the first adjustment condition includes if the current voltage data is greater than a first preset value, and the number of voltage data greater than the first preset value in the historical voltage data is greater than or equal to the preset number; and if the current voltage data is less than a second preset value, and the number of voltage data less than the second preset value in the historical voltage data is greater than or equal to the preset number;

[0033] A second judgment module is used to adjust the current voltage data by switching the capacitor bank on or off to obtain an adjusted voltage. If the adjusted voltage meets any one of the second adjustment conditions, S4 is executed, and the result of switching the capacitor bank on or off in this step is maintained, otherwise the voltage is not adjusted, wherein the second adjustment condition includes if the capacitor bank is fully switched off and the adjusted voltage is greater than the first preset value; and if the capacitor bank is fully switched on and the adjusted voltage is less than the second preset value;

[0034] The early warning module uses the photovoltaic power generation power and the photovoltaic power generation power factor to regulate the adjusted voltage to obtain a final voltage. If the final voltage meets any one of the third adjustment conditions, the system will give an alarm, otherwise the voltage will not be adjusted, wherein the third adjustment condition includes if the photovoltaic power generation power is less than or equal to the first power generation preset value, and the photovoltaic power generation power factor is greater than or equal to the first power factor value, and the final voltage is greater than the first preset value; and if the photovoltaic power generation power is greater than or equal to the second power generation preset value, and the photovoltaic power generation power factor is less than or equal to the second power factor value, and the final voltage is less than the second preset value.

[0035] In a possible implementation of the second aspect, the current voltage data is regulated by switching the capacitor bank on or off to obtain an adjusted voltage, specifically:

[0036] S31: if the current voltage data is greater than the first preset value, execute S32; if the current voltage data is less than the second preset value, execute S34; otherwise, do not perform voltage adjustment;

[0037] S32: If all capacitor banks are cut out, no voltage adjustment is performed, otherwise S33 is executed;

[0038] S33: Cut out a group of capacitors to adjust the current voltage data to obtain an adjusted voltage. If the adjusted voltage is greater than a first preset value, execute S32, otherwise, do not adjust the voltage.

[0039] S34: If all capacitor banks are put into operation, no voltage adjustment is performed, otherwise S35 is executed;

[0040] S35: a group of capacitors is put into use to adjust the current voltage data to obtain an adjusted voltage. If the adjusted voltage is less than a second preset value, S34 is executed, otherwise no voltage adjustment is performed.

[0041] In a possible implementation of the second aspect, the adjusted voltage is regulated using the photovoltaic power generation power and the photovoltaic power generation power factor to obtain a final voltage, specifically:

[0042] S41: if the adjusted voltage is greater than the first preset value, execute S42; if the adjusted voltage is less than the second preset value, execute S44; otherwise, do not adjust the voltage;

[0043] S42: If the photovoltaic power generation power is less than or equal to the first power generation preset value, execute S46, otherwise execute S43;

[0044] S43: after reducing the photovoltaic power generation power by one gear, adjusting the adjusted voltage data to obtain a final voltage, if the final voltage is greater than the first preset value, executing S42, otherwise, no voltage adjustment is performed;

[0045] S44: If the photovoltaic power generation power is greater than or equal to the second power generation preset value, execute S48, otherwise execute S45;

[0046] S45: after the photovoltaic power generation power is increased by one gear, the adjusted voltage data is adjusted to obtain a final voltage. If the final voltage is less than the second preset value, S44 is executed, otherwise the voltage is not adjusted;

[0047] S46: If the photovoltaic power generation power factor is greater than or equal to the first power factor, the system issues an alarm, otherwise executes S47;

[0048] S47: Increase the photovoltaic power factor by 0.1, adjust the adjusted voltage data to obtain a final voltage, and if the final voltage is greater than the first preset value, execute S46, otherwise, do not adjust the voltage;

[0049] S48: If the photovoltaic power generation power factor is less than or equal to the second power factor, the system will give an alarm, otherwise, execute S49;

[0050] S49: The photovoltaic power generation power factor is adjusted down by 0.1, and the adjusted voltage data is adjusted to obtain a final voltage. If the final voltage is less than the first preset value, S48 is executed, otherwise the voltage is not adjusted.

[0051] In a possible implementation of the second aspect, the first power generation preset value is the minimum power generation value allowed by the photovoltaic power generation system, the second power generation preset value is the maximum power generation value allowed by the photovoltaic power generation system, the first power factor value is the maximum power generation factor value allowed by the photovoltaic power generation system, and the second power factor value is the minimum power generation factor value allowed by the photovoltaic power generation system.

[0052] In a possible implementation manner of the second aspect, the preset number is specifically:

[0053] The preset number is set to 0.5 times the historical voltage data. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 : A flow chart of an embodiment of a reactive power compensation control method for fishery-photovoltaic complementarity provided by the present invention;

[0055] Figure 2 : A schematic diagram of a control device for an embodiment of a reactive power compensation control method for fishery-photovoltaic complementarity provided by the present invention;

[0056] Figure 3 : A control logic diagram of a main control unit of an embodiment of a reactive power compensation control method for fishery-photovoltaic complementarity provided by the present invention;

[0057] Figure 4 : A control logic diagram of a capacitor bank in accordance with an embodiment of the reactive power compensation control method for fishery-photovoltaic complementarity provided by the present invention;

[0058] Figure 5 : A control logic diagram of a photovoltaic power generation system according to an embodiment of the reactive power compensation control method for fishery-photovoltaic complementarity provided by the present invention;

[0059] Figure 6 : A schematic diagram of the system structure of another embodiment of the reactive power compensation control method for fishery-photovoltaic complementarity provided by the present invention. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] Embodiment 1

[0062] Please refer to Figure 1 , which is a flow chart of an embodiment of a reactive power compensation control method for fishery-photovoltaic complementarity provided by an embodiment of the present invention, including steps S1 to S4, each of which is specifically as follows:

[0063] S1. Collect current voltage data, historical voltage data, capacitor operation status, photovoltaic power generation, power factor and photovoltaic surplus power generation of the fish pond load grid connection point, wherein the historical voltage data is the historical voltage data within a preset time period.

[0064] In this embodiment, a reactive power compensation control device of fishing-photovoltaic complementary is used to adjust the voltage, such as Figure 2As shown, the reactive compensation control device for fish-photovoltaic complementarity consists of a main control module, an acquisition module, a control module, a human-computer interaction module, a data storage module, and a communication module; the acquisition module is connected to the capacitor bank, the photovoltaic power generation system, and the voltage monitoring device; the control module is connected to the capacitor bank and the photovoltaic power generation system; the main control module is connected to the human-computer interaction module, the data storage module, the acquisition module, the control module, and the communication module. First, the acquisition module is used to obtain the voltage data of the current fish pond load grid connection point through the voltage monitoring device, the current capacitor operation status is obtained through the capacitor bank, and the current photovoltaic power generation power, power factor, and remaining power generation power are obtained through the photovoltaic power generation system.

[0065] The control module is then used to send control instructions to the capacitor bank and photovoltaic power generation system; the communication module communicates with the main station to achieve remote monitoring and control; the data storage module is used to store voltage history data and related parameter values ​​in the control process; the operator uses the human-computer interaction module to adjust related parameters, retrieve historical data, control records and other related data.

[0066] S2. Judge the current voltage data. If the current voltage data satisfies any one of the first adjustment conditions, execute S3, otherwise do not adjust the voltage, wherein the first adjustment condition includes if the current voltage data is greater than a first preset value, and the number of voltage data greater than the first preset value in the historical voltage data is greater than or equal to the preset number; and if the current voltage data is less than a second preset value, and the number of voltage data less than the second preset value in the historical voltage data is greater than or equal to the preset number.

[0067] In this embodiment, the current voltage data is judged. If the current voltage data satisfies the conditions that the current voltage data is greater than a first preset value, and the number of voltage data greater than the first preset value in the historical voltage data is greater than or equal to the preset number; or the current voltage data is less than a second preset value, and the number of voltage data less than the second preset value in the historical voltage data is greater than or equal to the preset number, the capacitor group is used for adjustment. If the conditions are not met, the voltage adjustment is not performed.

[0068] For specific steps, see Figure 3 , the specific steps are:

[0069] (1) Obtain the current voltage value (U) and the historical voltage set (DU) at 15-minute intervals over the past three hours.

[0070] (2) If the current voltage value (U) is outside the allowable range, go to step (3); otherwise, this cycle ends.

[0071] (3) If the current voltage value (U) exceeds the upper limit, go to step (4); otherwise, go to step (5).

[0072] (4) If the number of elements exceeding the upper limit in the historical voltage set (DU) accounts for 50% or more of the total number of elements, go to step (6); otherwise, this round of the process ends.

[0073] (5) If the number of elements exceeding the lower limit in the historical voltage set (DU) accounts for 50% or more of the total number of elements, go to step (6); otherwise, this round of the process ends.

[0074] (6) If the current voltage value cannot be adjusted to within the allowable range by switching the capacitor bank, go to step (7), otherwise the cycle ends.

[0075] (7) By adjusting the output of the photovoltaic power generation system, if the current voltage value cannot be adjusted to within the allowable range, go to step (8), otherwise this round of cycle ends.

[0076] (8) The system alarms and this cycle ends.

[0077] S3. The current voltage data is regulated by switching the capacitor group on or off to obtain an adjusted voltage. If the adjusted voltage satisfies any one of the second adjustment conditions, S4 is executed and the adjusted voltage is maintained, otherwise no voltage adjustment is performed, wherein the second adjustment condition includes if the capacitor group is fully switched off and the adjusted voltage is greater than the first preset value; and if the capacitor group is fully switched on and the adjusted voltage is less than the second preset value.

[0078] In a preferred embodiment, the current voltage data is regulated by switching on or off the capacitor bank to obtain an adjusted voltage, specifically:

[0079] S31: if the current voltage data is greater than the first preset value, execute S32; if the current voltage data is less than the second preset value, execute S34; otherwise, do not perform voltage adjustment;

[0080] S32: If all the capacitor banks are cut out, no voltage adjustment is performed, otherwise S33 is executed;

[0081] S33: Cut out a group of the capacitor groups to adjust the current voltage data to obtain an adjusted voltage. If the adjusted voltage is greater than the first preset value, execute S32; otherwise, do not adjust the voltage.

[0082] S34: If the capacitor bank is fully operational, no voltage adjustment is performed, otherwise S35 is executed;

[0083] S35: Putting one group of the capacitor groups into use to adjust the current voltage data to obtain the adjusted voltage. If the adjusted voltage is less than the second preset value, executing S34, otherwise, no voltage adjustment is performed.

[0084] In a preferred embodiment, the preset number is set to 0.5 times the number of historical voltage data.

[0085] In this embodiment, the specific steps of adjusting the current voltage data by using the capacitor bank are as follows: Figure 4 As shown, the specific steps are:

[0086] (1) If the current voltage (U) exceeds the upper limit, go to step (2); otherwise, go to step (5).

[0087] (2) If all capacitor banks are currently switched off, go to step (8); otherwise, go to step (3).

[0088] (3) Cut out 1 group of capacitors.

[0089] (4) If the current voltage is within the allowable range, go to step (9); otherwise, go to step (2).

[0090] (5) If all capacitor banks are currently in operation, go to step (8); otherwise, go to step (6).

[0091] (6) Put one set of capacitors into operation.

[0092] (7) If the current voltage is within the allowable range, go to step (9); otherwise, go to step (5).

[0093] (8) The capacitor bank cannot adjust the voltage to within the allowable range, and this round of the process ends.

[0094] (9) The capacitor bank has adjusted the voltage to within the allowable range, and this round of the process ends.

[0095] S4. Use the photovoltaic power generation power and the photovoltaic power generation power factor to regulate the adjusted voltage to obtain the final voltage. If the final voltage meets any one of the third adjustment conditions, the system will alarm, otherwise the voltage will not be adjusted, wherein the third adjustment condition includes if the photovoltaic power generation power is less than or equal to the first power generation preset value, and the photovoltaic power generation power factor is greater than or equal to the first power factor value, and the final voltage is greater than the first preset value; and if the photovoltaic power generation power is greater than or equal to the second power generation preset value, and the photovoltaic power generation power factor is less than or equal to the second power factor value, and the final voltage is less than the second preset value.

[0096] In a preferred embodiment, the adjusted voltage is regulated by using the photovoltaic power generation power and the photovoltaic power generation power factor to obtain the final voltage, specifically:

[0097] S41: if the adjusted voltage is greater than the first preset value, execute S42; if the adjusted voltage is less than the second preset value, execute S44; otherwise, do not adjust the voltage;

[0098] S42: If the photovoltaic power generation power is less than or equal to the first power generation preset value, execute S46, otherwise execute S43;

[0099] S43: after reducing the photovoltaic power generation power by one gear, adjusting the adjusted voltage data to obtain a final voltage, if the final voltage is greater than the first preset value, executing S42, otherwise, no voltage adjustment is performed;

[0100] S44: If the photovoltaic power generation power is greater than or equal to the second power generation preset value, execute S48, otherwise execute S45;

[0101] S45: after the photovoltaic power generation power is increased by one gear, the adjusted voltage data is adjusted to obtain a final voltage. If the final voltage is less than the second preset value, S44 is executed, otherwise the voltage is not adjusted;

[0102] S46: If the photovoltaic power generation power factor is greater than or equal to the first power factor, the system issues an alarm, otherwise executes S47;

[0103] S47: Increase the photovoltaic power factor by 0.1, adjust the adjusted voltage data to obtain a final voltage, and if the final voltage is greater than the first preset value, execute S46, otherwise, do not adjust the voltage;

[0104] S48: If the photovoltaic power generation power factor is less than or equal to the second power factor, the system will give an alarm, otherwise, execute S49;

[0105] S49: The photovoltaic power generation power factor is adjusted down by 0.1, and the adjusted voltage data is adjusted to obtain a final voltage. If the final voltage is less than the first preset value, S48 is executed, otherwise the voltage is not adjusted.

[0106] In this embodiment, the specific steps of adjusting the voltage data of photovoltaic power generation are as follows: Figure 5 As shown, the specific steps are:

[0107] (1) If the current voltage (U) exceeds the upper limit, go to step (2); otherwise, go to step (8).

[0108] (2) If the current power generation of the photovoltaic power generation system has been adjusted to the minimum, go to step (5); otherwise, go to step (3).

[0109] (3) Reduce the power generation of the photovoltaic power generation system by one level.

[0110] (4) If the current voltage is within the allowable range, go to step (15); otherwise, go to step (2).

[0111] (5) If the current photovoltaic power generation system power factor has been adjusted to the maximum, go to step (14); otherwise, go to step (6).

[0112] (6) Increase the power factor of the photovoltaic power generation system by 0.1.

[0113] (7) If the current voltage is within the allowable range, go to step (15); otherwise, go to step (5).

[0114] (8) If the current power generation power of the photovoltaic power generation system has been adjusted to the maximum, go to step (11); otherwise, go to step (9).

[0115] (9) Increase the power generation of the photovoltaic power generation system by one level.

[0116] (10) If the current voltage is within the allowable range, go to step (15), otherwise go to step (8).

[0117] (11) If the current photovoltaic power generation system power factor has been adjusted to the minimum, go to step (14); otherwise, go to step (12).

[0118] (12) Reduce the power factor of the photovoltaic power generation system by 0.1.

[0119] (13) If the current voltage is within the allowable range, go to step (15); otherwise, go to step (11).

[0120] (14) The photovoltaic power generation system cannot adjust the voltage to within the allowable range, and this round of the process ends.

[0121] (15) The photovoltaic power generation system has adjusted the voltage to within the allowable range, and this round of the process is completed.

[0122] Among them, 1 gear means: 10% of the total power generation of the photovoltaic power generation system. The allowed interval is the interval in which the voltage is allowed to operate, which can be manually set through the human-computer interaction module. The default value is [353V, 406V]. The first preset value can be preferably 406V, and the second preset value can be preferably 353V. The preset number is set to 0.5 times the number of historical voltage data.

[0123] As an example of this embodiment, the set voltage allowable range of this fish pond is [353V, 406V]. At 13:15 on January 20, 2023, the grid-connected voltage of this fish pond was measured to be 330V. At the same time, 63% of the voltage data of the fish pond at intervals of 15 minutes in the past 3 hours was lower than 353V.

[0124] There is one remaining capacitor bank in this fish pond that has not been put into operation. After it is put into operation, the voltage at the grid-connected point of this fish pond is increased to 340V, which is still outside the allowable voltage range.

[0125] The photovoltaic power generation system of this fish pond has 1 level of remaining power to the maximum power generation. After increasing it by 1 level, the voltage at the grid-connected point of this fish pond increases to 345V, which is still outside the allowable voltage range.

[0126] The power factor of the fish pond power generation system is 0.95. After lowering it by 0.1, the voltage at the fish pond grid connection point increases to 359V, which is within the allowable voltage range, and this round of process ends.

[0127] Embodiment 2

[0128] Accordingly, see Figure 6 , Figure 6 The invention provides a reactive power compensation control device for fishery-photovoltaic complementation. As shown in the figure, the reactive power compensation control device for fishery-photovoltaic complementation includes:

[0129] The collection module 601 is used to collect the current voltage data, historical voltage data, capacitor operation status, photovoltaic power generation, power factor and photovoltaic surplus power generation of the fish pond load grid connection point, wherein the historical voltage data is the historical voltage data within a preset time period;

[0130] A first judgment module 602 is used to judge the current voltage data. If the current voltage data satisfies any one of the first adjustment conditions, S3 is executed, otherwise the voltage adjustment is not performed, wherein the first adjustment condition includes if the current voltage data is greater than a first preset value, and the number of voltage data greater than the first preset value in the historical voltage data is greater than or equal to a preset number; and if the current voltage data is less than a second preset value, and the number of voltage data less than the second preset value in the historical voltage data is greater than or equal to a preset number;

[0131] The second judgment module 603 is used to adjust the current voltage data by switching the capacitor bank on or off to obtain an adjusted voltage. If the adjusted voltage meets any one of the second adjustment conditions, S4 is executed, and the result of switching the capacitor bank on or off in this step is maintained. Otherwise, the voltage is not adjusted. The second adjustment condition includes if the capacitor bank is fully switched off and the adjusted voltage is greater than the first preset value; and if the capacitor bank is fully switched on and the adjusted voltage is less than the second preset value.

[0132] The early warning module 604 uses the photovoltaic power generation power and the photovoltaic power generation power factor to regulate the adjusted voltage to obtain a final voltage. If the final voltage meets any one of the third adjustment conditions, the system will alarm, otherwise the voltage adjustment will not be performed, wherein the third adjustment condition includes if the photovoltaic power generation power is less than or equal to the first power generation preset value, and the photovoltaic power generation power factor is greater than or equal to the first power factor value, and the final voltage is greater than the first preset value; and if the photovoltaic power generation power is greater than or equal to the second power generation preset value, and the photovoltaic power generation power factor is less than or equal to the second power factor value, and the final voltage is less than the second preset value.

[0133] In a preferred embodiment, the current voltage data is regulated by switching the capacitor bank on or off to obtain an adjusted voltage, specifically:

[0134] S31: if the current voltage data is greater than the first preset value, execute S32; if the current voltage data is less than the second preset value, execute S34; otherwise, do not perform voltage adjustment;

[0135] S32: If all capacitor banks are cut out, no voltage adjustment is performed, otherwise S33 is executed;

[0136] S33: Cut out a group of capacitors to adjust the current voltage data to obtain an adjusted voltage. If the adjusted voltage is greater than a first preset value, execute S32, otherwise, do not adjust the voltage.

[0137] S34: If all capacitor banks are put into operation, no voltage adjustment is performed, otherwise S35 is executed;

[0138] S35: a group of capacitors is put into use to adjust the current voltage data to obtain an adjusted voltage. If the adjusted voltage is less than a second preset value, S34 is executed, otherwise no voltage adjustment is performed.

[0139] In a preferred embodiment, the adjusted voltage is regulated by using the photovoltaic power generation power and the photovoltaic power generation power factor to obtain the final voltage, specifically:

[0140] S41: if the adjusted voltage is greater than the first preset value, execute S42; if the adjusted voltage is less than the second preset value, execute S44; otherwise, do not adjust the voltage;

[0141] S42: If the photovoltaic power generation power is less than or equal to the first power generation preset value, execute S46, otherwise execute S43;

[0142] S43: after reducing the photovoltaic power generation power by one gear, adjusting the adjusted voltage data to obtain a final voltage, if the final voltage is greater than the first preset value, executing S42, otherwise, no voltage adjustment is performed;

[0143] S44: If the photovoltaic power generation power is greater than or equal to the second power generation preset value, execute S48, otherwise execute S45;

[0144] S45: after the photovoltaic power generation power is increased by one gear, the adjusted voltage data is adjusted to obtain a final voltage. If the final voltage is less than the second preset value, S44 is executed, otherwise the voltage is not adjusted;

[0145] S46: If the photovoltaic power generation power factor is greater than or equal to the first power factor, the system issues an alarm, otherwise executes S47;

[0146] S47: Increase the photovoltaic power factor by 0.1, adjust the adjusted voltage data to obtain a final voltage, and if the final voltage is greater than the first preset value, execute S46, otherwise, do not adjust the voltage;

[0147] S48: If the photovoltaic power generation power factor is less than or equal to the second power factor, the system will give an alarm, otherwise, execute S49;

[0148] S49: The photovoltaic power generation power factor is adjusted down by 0.1, and the adjusted voltage data is adjusted to obtain a final voltage. If the final voltage is less than the first preset value, S48 is executed, otherwise the voltage is not adjusted.

[0149] In a preferred embodiment, the first power generation preset value is the minimum power generation value allowed by the photovoltaic power generation system, the second power generation preset value is the maximum power generation value allowed by the photovoltaic power generation system, the first power factor value is the maximum power generation factor value allowed by the photovoltaic power generation system, and the second power factor value is the minimum power generation factor value allowed by the photovoltaic power generation system.

[0150] In a preferred embodiment, the preset number is set to 0.5 times the historical voltage data.

[0151] The more detailed working principle and step flow of this embodiment can refer to, but are not limited to, the relevant records of Embodiment 1.

[0152] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0153] By collecting the current voltage data, historical voltage data, capacitor operation status, photovoltaic power generation power, power factor and photovoltaic surplus power generation of the fish pond load grid point, the current voltage data is judged. If the current voltage data is greater than a first preset value, and the number of voltage data greater than the first preset value in the historical voltage data is greater than or equal to the preset number, or if the current voltage data is less than a second preset value, and the number of voltage data less than the second preset value in the historical voltage data is greater than or equal to the preset number, the current voltage data is regulated by switching the capacitor bank on or off to obtain an adjusted voltage. If the capacitor bank is fully switched off and the adjusted voltage is greater than the first preset value, or if the capacitor bank is fully switched on and the adjusted voltage is less than the second preset value, the current voltage data is regulated by switching the capacitor bank on or off to obtain an adjusted voltage. If the photovoltaic power generation power is less than or equal to the first power generation preset value, and the photovoltaic power generation power factor is greater than or equal to the first power factor value, and the final voltage is greater than the first preset value; and if the photovoltaic power generation power is greater than or equal to the second power generation preset value, and the photovoltaic power generation power factor is less than or equal to the second power factor value, and the final voltage is less than the second preset value, the method adjusts the voltage by combining the fish pond and photovoltaic power generation, so that the photovoltaic power generation and the fish pond load are complementary, thereby improving the utilization efficiency of power grid resources.

[0154] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A reactive power compensation control method for fishery-photovoltaic complementarity, It is characterized in that include: S1: Collecting current voltage data, historical voltage data, capacitor operation status, photovoltaic power generation, power factor and photovoltaic surplus power generation of the fish pond load grid connection point, wherein the historical voltage data is the historical voltage data within a preset time period; S2: judging the current voltage data, and if the current voltage data satisfies any one of the first adjustment conditions, executing S3, otherwise not adjusting the voltage, wherein the first adjustment condition includes if the current voltage data is greater than a first preset value, and the number of voltage data greater than the first preset value in the historical voltage data is greater than or equal to the preset number; and if the current voltage data is less than a second preset value, and the number of voltage data less than the second preset value in the historical voltage data is greater than or equal to the preset number; S3: the current voltage data is regulated by switching the capacitor bank on or off to obtain an adjusted voltage. If the adjusted voltage satisfies any one of the second adjustment conditions, S4 is executed and the adjusted voltage is maintained. Otherwise, the voltage is not adjusted. The second adjustment condition includes if the capacitor bank is fully switched off and the adjusted voltage is greater than the first preset value; and if the capacitor bank is fully switched on and the adjusted voltage is less than the second preset value. S4: Regulating the adjusted voltage using the photovoltaic power generation power and the photovoltaic power generation power factor to obtain a final voltage, and if the final voltage satisfies any one of the third adjustment conditions, the system will give an alarm, otherwise the voltage will not be adjusted, wherein the third adjustment condition includes if the photovoltaic power generation power is less than or equal to the first power generation preset value, and the photovoltaic power generation power factor is greater than or equal to the first power factor value, and the final voltage is greater than the first preset value; and if the photovoltaic power generation power is greater than or equal to the second power generation preset value, and the photovoltaic power generation power factor is less than or equal to the second power factor value, and the final voltage is less than the second preset value; The current voltage data is regulated by switching the capacitor bank on or off to obtain the adjusted voltage, specifically: S31: if the current voltage data is greater than the first preset value, execute S32; if the current voltage data is less than the second preset value, execute S34; otherwise, do not perform voltage adjustment; S32: If all the capacitor banks are cut out, no voltage adjustment is performed, otherwise S33 is executed; S33: Cut out a group of the capacitor groups to adjust the current voltage data to obtain an adjusted voltage. If the adjusted voltage is greater than the first preset value, execute S32; otherwise, do not adjust the voltage. S34: If the capacitor bank is fully operational, no voltage adjustment is performed, otherwise S35 is executed; S35: putting one group of the capacitor banks into use to adjust the current voltage data to obtain the adjusted voltage. If the adjusted voltage is less than the second preset value, executing S34, otherwise, no voltage adjustment is performed. The photovoltaic power generation power and photovoltaic power factor are used to regulate the adjusted voltage to obtain the final voltage, specifically: S41: if the adjusted voltage is greater than the first preset value, execute S42; if the adjusted voltage is less than the second preset value, execute S44; otherwise, do not adjust the voltage; S42: If the photovoltaic power generation power is less than or equal to the first power generation preset value, execute S46, otherwise execute S43; S43: after reducing the photovoltaic power generation power by one gear, adjusting the adjusted voltage data to obtain a final voltage, if the final voltage is greater than the first preset value, executing S42, otherwise, no voltage adjustment is performed; S44: If the photovoltaic power generation power is greater than or equal to the second power generation preset value, execute S48, otherwise execute S45; S45: after increasing the photovoltaic power generation power by one gear, adjusting the adjusted voltage data to obtain a final voltage, if the final voltage is less than the second preset value, executing S44, otherwise, not performing voltage adjustment; S46: If the photovoltaic power generation power factor is greater than or equal to the first power factor, the system issues an alarm, otherwise executes S47; S47: increasing the photovoltaic power factor by 0.1, adjusting the adjusted voltage data to obtain a final voltage, and if the final voltage is greater than the first preset value, executing S46, otherwise, not performing voltage adjustment; S48: If the photovoltaic power factor is less than or equal to the second power factor, the system issues an alarm, otherwise executes S49; S49: the photovoltaic power generation power factor is adjusted down by 0.1, and the adjusted voltage data is adjusted to obtain a final voltage. If the final voltage is less than the first preset value, S48 is executed, otherwise no voltage adjustment is performed.

2. A reactive power compensation control method for fishery-photovoltaic complementarity as claimed in claim 1, It is characterized in that The first power generation preset value is the minimum power generation value allowed by the photovoltaic power generation system, the second power generation preset value is the maximum power generation value allowed by the photovoltaic power generation system, the first power factor value is the maximum power generation factor value allowed by the photovoltaic power generation system, and the second power factor value is the minimum power generation factor value allowed by the photovoltaic power generation system.

3. A reactive power compensation control method for fishery-photovoltaic complementarity as claimed in claim 1, It is characterized in that The preset quantity is specifically: The preset number is set to 0.5 times the number of historical voltage data.

4. A reactive power compensation control device for fishery-photovoltaic complementary power generation. It is characterized in that include: A collection module is used to collect current voltage data, historical voltage data, capacitor operation status, photovoltaic power generation, power factor and photovoltaic surplus power generation of the fish pond load grid connection point, wherein the historical voltage data is the historical voltage data within a preset time period; A first judgment module is used to judge the current voltage data, and if the current voltage data satisfies any one of the first adjustment conditions, S3 is executed, otherwise the voltage adjustment is not performed, wherein the first adjustment condition includes if the current voltage data is greater than a first preset value, and the number of voltage data greater than the first preset value in the historical voltage data is greater than or equal to the preset number; and if the current voltage data is less than a second preset value, and the number of voltage data less than the second preset value in the historical voltage data is greater than or equal to the preset number; A second judgment module is used to adjust the current voltage data by switching the capacitor bank on or off to obtain an adjusted voltage. If the adjusted voltage meets any one of the second adjustment conditions, S4 is executed, and the result of switching the capacitor bank on or off in this step is maintained, otherwise the voltage is not adjusted, wherein the second adjustment condition includes if the capacitor bank is fully switched off and the adjusted voltage is greater than the first preset value; and if the capacitor bank is fully switched on and the adjusted voltage is less than the second preset value; an early warning module, which uses the photovoltaic power generation power and the photovoltaic power generation power factor to regulate the adjusted voltage to obtain a final voltage, and if the final voltage satisfies any one of the third adjustment conditions, the system will give an alarm, otherwise the voltage will not be adjusted, wherein the third adjustment condition includes if the photovoltaic power generation power is less than or equal to the first power generation preset value, and the photovoltaic power generation power factor is greater than or equal to the first power factor value, and the final voltage is greater than the first preset value; and if the photovoltaic power generation power is greater than or equal to the second power generation preset value, and the photovoltaic power generation power factor is less than or equal to the second power factor value, and the final voltage is less than the second preset value; The current voltage data is regulated by switching the capacitor bank on or off to obtain the adjusted voltage, specifically: S31: if the current voltage data is greater than the first preset value, execute S32; if the current voltage data is less than the second preset value, execute S34; otherwise, do not perform voltage adjustment; S32: If all the capacitor banks are cut out, no voltage adjustment is performed, otherwise S33 is executed; S33: Cut out a group of the capacitor groups to adjust the current voltage data to obtain an adjusted voltage. If the adjusted voltage is greater than the first preset value, execute S32; otherwise, do not adjust the voltage. S34: If the capacitor bank is fully operational, no voltage adjustment is performed, otherwise S35 is executed; S35: putting one group of the capacitor banks into use to adjust the current voltage data to obtain the adjusted voltage. If the adjusted voltage is less than the second preset value, executing S34, otherwise, no voltage adjustment is performed. The photovoltaic power generation power and photovoltaic power factor are used to regulate the adjusted voltage to obtain the final voltage, specifically: S41: if the adjusted voltage is greater than the first preset value, execute S42; if the adjusted voltage is less than the second preset value, execute S44; otherwise, do not adjust the voltage; S42: If the photovoltaic power generation power is less than or equal to the first power generation preset value, execute S46, otherwise execute S43; S43: after reducing the photovoltaic power generation power by one gear, adjusting the adjusted voltage data to obtain a final voltage, if the final voltage is greater than the first preset value, executing S42, otherwise, no voltage adjustment is performed; S44: If the photovoltaic power generation power is greater than or equal to the second power generation preset value, execute S48, otherwise execute S45; S45: after increasing the photovoltaic power generation power by one gear, adjusting the adjusted voltage data to obtain a final voltage, if the final voltage is less than the second preset value, executing S44, otherwise, not performing voltage adjustment; S46: If the photovoltaic power generation power factor is greater than or equal to the first power factor, the system issues an alarm, otherwise executes S47; S47: increasing the photovoltaic power factor by 0.1, adjusting the adjusted voltage data to obtain a final voltage, and if the final voltage is greater than the first preset value, executing S46, otherwise, not performing voltage adjustment; S48: If the photovoltaic power factor is less than or equal to the second power factor, the system issues an alarm, otherwise executes S49; S49: the photovoltaic power generation power factor is adjusted down by 0.1, and the adjusted voltage data is adjusted to obtain a final voltage. If the final voltage is less than the first preset value, S48 is executed, otherwise no voltage adjustment is performed.

5. A reactive power compensation control device for fishery-photovoltaic complementarity as claimed in claim 4, It is characterized in that The first power generation preset value is the minimum power generation value allowed by the photovoltaic power generation system, the second power generation preset value is the maximum power generation value allowed by the photovoltaic power generation system, the first power factor value is the maximum power generation factor value allowed by the photovoltaic power generation system, and the second power factor value is the minimum power generation factor value allowed by the photovoltaic power generation system.

6. A reactive power compensation control device for fishery-photovoltaic complementarity as claimed in claim 4, It is characterized in that The preset quantity is specifically: The preset number is set to 0.5 times the historical voltage data.

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