Power distribution area multi-distributed photovoltaic power control method and device, electronic equipment and storage medium

Abstract

The invention discloses a power distribution area multi-distributed photovoltaic power control method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring a voltage value of each node in an area, the current output of each distributed photovoltaic and the total load of the area; calculating the minimum guaranteed output of each distributed photovoltaic; according to the voltage value of each node, determining whether there is a node whose voltage exceeds an upper limit in the transformer area; if yes, for each node whose voltage exceeds the upper limit, calculating a unit adjustment value of each distributed photovoltaic, and according to the unit adjustment value, sequentially adjusting distributed photovoltaic output according to a sequence until the voltage of the current node does not exceed the upper limit; if not, calculating the total output of the distributed photovoltaics, calculating the proportion of the current output of each distributed photovoltaic in the total output of the distributed photovoltaics under the condition that the total output of the distributed photovoltaics is greater than the total load of the transformer area, and reducing the output of the distributed photovoltaics according to the proportion; by implementing the invention, the problems that the node voltage exceeds the upper limit and the power is reversely transmitted in the transformer area can be solved.

Description

Technical Field

[0001] The present invention relates to the field of distributed photovoltaic control technology, and in particular to a method, device, electronic equipment and storage medium for controlling multi-distributed photovoltaic power in a distribution station area. Background Art

[0002] In recent years, with the transformation of the global energy structure and the increase in demand for renewable energy, distributed photovoltaic power generation systems have been rapidly popularized in various places. Distributed photovoltaic power generation, as a clean and efficient form of energy, has the characteristics of local power generation and local consumption, which can effectively reduce dependence on traditional fossil energy and reduce greenhouse gas emissions. Especially in the distributed structure of the power grid, photovoltaic power generation systems, as an important form of distributed power supply, can not only provide users with a stable power supply, but also alleviate the load pressure of the power grid to a certain extent and enhance the power supply reliability of the power grid.

[0003] However, as the number and scale of distributed photovoltaic power grid access continue to increase, traditional distribution networks are also facing new challenges. The large-scale grid connection of distributed photovoltaic power has changed the power flow direction of the power system, causing the power transmission mode in the distribution area to gradually change from traditional one-way transmission to multi-directional transmission. Under good lighting conditions, the output of distributed photovoltaic power generation may far exceed user demand, resulting in excess power being fed back to the grid. This power backflow phenomenon not only increases the management complexity of the grid, but may also cause local voltage fluctuations and even cause the voltage of some nodes to exceed the set safety upper limit, affecting the stable operation of the grid. Summary of the invention

[0004] The embodiment of the present invention provides a method, device, electronic device and storage medium for controlling the power of multiple distributed photovoltaic power in a distribution substation area. By implementing the present invention, it is possible to control the power of multiple distributed photovoltaic power in a distribution substation area, which is used to solve the problem of voltage exceeding the upper limit and power reverse transmission caused by excessive distributed photovoltaic output in the prior art, thereby improving the stability of the operation of the distribution substation area.

[0005] An embodiment of the present invention provides a method for controlling multi-distributed photovoltaic power in a power distribution area, comprising:

[0006] Obtain the real-time voltage value of each node in the control area, the distance from each distributed photovoltaic to any node, the rated capacity of each distributed photovoltaic, the current output of each distributed photovoltaic, the power supply radius of the area and the total load of the area.

[0007] Calculate the minimum guaranteed output of each distributed photovoltaic system based on the power supply radius of the substation, the distance from each distributed photovoltaic system to the head-end node of the substation, and the rated capacity of each distributed photovoltaic system;

[0008] Compare the real-time voltage value of each node in the substation with the preset voltage upper limit to determine whether there is a node whose voltage exceeds the upper limit;

[0009] If so, for each node whose voltage exceeds the upper limit, the unit adjustment value of each distributed photovoltaic is calculated according to the minimum guaranteed output and the current output of each distributed photovoltaic, and according to the unit adjustment value, the corresponding distributed photovoltaic output is adjusted in order from near to far from the node whose voltage exceeds the upper limit until the current node voltage does not exceed the upper limit;

[0010] If not, calculate the sum of the current outputs of each distributed photovoltaic system to obtain the total output of distributed photovoltaic systems; compare the total output of distributed photovoltaic systems with the total load of the area;

[0011] When the total output of distributed photovoltaics is greater than the total load of the substation, for each distributed photovoltaic, the proportion of its current output to the total output of distributed photovoltaics is calculated, and the output of the distributed photovoltaic is reduced according to the proportion, the total load of the substation and the minimum guaranteed output.

[0012] Furthermore, the method for controlling multi-distributed photovoltaic power in a distribution station area also includes: when the total output of distributed photovoltaics is less than or equal to the total load of the area, for each distributed photovoltaic, calculating the proportion of its current output to the total output of distributed photovoltaics, and increasing the output of the distributed photovoltaic according to the proportion and the total load of the area.

[0013] Further, the minimum guaranteed output of each distributed photovoltaic is calculated according to the power supply radius of the substation, the distance from each distributed photovoltaic to the head-end node of the substation, and the rated capacity of each distributed photovoltaic, including: for each distributed photovoltaic, calculating the quotient of its distance to the head-end node of the substation and the power supply radius of the substation to obtain a first value;

[0014] The minimum guaranteed output of the distributed photovoltaic system is calculated based on the first value and the rated capacity of the distributed photovoltaic system.

[0015] Further, the calculating the unit adjustment value of each distributed photovoltaic according to the minimum guaranteed output and the current output of each distributed photovoltaic includes: for each distributed photovoltaic, calculating the difference between its current output and the corresponding minimum guaranteed output to obtain a first difference;

[0016] The unit regulation value of the distributed photovoltaic system is calculated based on the first difference and the preset regulation unit.

[0017] Further, the output of the corresponding distributed photovoltaic is adjusted in sequence according to the unit adjustment value, in the order of the distributed photovoltaic distance from the node with the voltage exceeding the upper limit from near to far, until the voltage of the current node does not exceed the upper limit, including: selecting a target distributed photovoltaic, and repeatedly performing the output adjustment operation until the voltage of the current node does not exceed the upper limit; wherein the initial target distributed photovoltaic is the distributed photovoltaic closest to the node with the current voltage exceeding the upper limit;

[0018] The output adjustment operation includes:

[0019] Determine whether the current output of the current target distributed photovoltaic is greater than its minimum guaranteed output.

[0020] If yes, calculate the difference between its current output and its unit adjustment value to obtain a second difference; adjust the current output of the current target distributed photovoltaic to the larger value between the second difference and its minimum guaranteed output; measure the real-time voltage value of the current node, and compare it with the preset voltage upper limit to determine whether the node voltage exceeds the upper limit;

[0021] If not, determine whether there are distributed photovoltaics that have not adjusted their output.

[0022] In the case of distributed photovoltaic power plants that have not adjusted their output, the distributed photovoltaic power plants that are closest to the current node and have not adjusted their output are selected as the updated target distributed photovoltaic power plants;

[0023] In the absence of distributed photovoltaic power generation with unadjusted output, the system enters the alarm state.

[0024] Furthermore, the calculation of the ratio of the current output to the total output of distributed photovoltaic power generation, and the reduction of the output of the distributed photovoltaic power generation according to the ratio, the total load of the area and the minimum guaranteed output, includes: calculating the ratio of the current output of the distributed photovoltaic power generation to the total output of the distributed photovoltaic power generation, and using the obtained ratio as the control ratio of the distributed photovoltaic power generation;

[0025] Calculate the difference between the total output of the distributed photovoltaic power plant and the total load of the substation to obtain a third difference; calculate the regulated power of the distributed photovoltaic power plant according to the third difference and the regulation proportion;

[0026] The difference between the current output of the current distributed photovoltaic system and the regulated power is calculated to obtain a fourth difference; and the current output of the current distributed photovoltaic system is adjusted to a larger value between the fourth difference and the minimum guaranteed output.

[0027] Furthermore, the calculation of the ratio of the current output of the distributed photovoltaic to the total output of the distributed photovoltaic, and the increase of the output of the distributed photovoltaic according to the ratio and the total load of the area, includes: calculating the ratio of the current output of the distributed photovoltaic to the total output of the distributed photovoltaic, and the obtained ratio is used as the control ratio of the distributed photovoltaic;

[0028] Calculate the difference between the total load of the area and the total output of the distributed photovoltaics to obtain the fifth difference; calculate the regulated power of the distributed photovoltaics based on the fifth difference and the regulation ratio; adjust the current output of the current distributed photovoltaics to the sum of the regulated power and the current output of the current distributed photovoltaics.

[0029] Based on the above method embodiment, the present invention provides a corresponding device embodiment.

[0030] An embodiment of the present invention provides a multi-distributed photovoltaic power control device in a distribution station area, including: a data acquisition module, a minimum guaranteed output generation module, an over-limit judgment module, an over-limit adjustment module, a power backflow judgment module and a power backflow adjustment module.

[0031] The data acquisition module is used to obtain the real-time voltage value of each node in the control area, the distance from each distributed photovoltaic to any node, the rated capacity of each distributed photovoltaic, the current output of each distributed photovoltaic, the power supply radius of the area and the total load of the area;

[0032] The minimum guaranteed output generation module is used to calculate the minimum guaranteed output of each distributed photovoltaic according to the power supply radius of the substation, the distance from each distributed photovoltaic to the head-end node of the substation, and the rated capacity of each distributed photovoltaic;

[0033] The over-limit judgment module is used to compare the real-time voltage value of each node in the substation with the preset voltage upper limit to determine whether there is a node whose voltage exceeds the upper limit;

[0034] The over-limit adjustment module is used to calculate the unit adjustment value of each distributed photovoltaic according to the minimum guaranteed output and the current output of each distributed photovoltaic when there is a node with a voltage exceeding the upper limit, and adjust the corresponding distributed photovoltaic output in order from near to far from the node with a voltage exceeding the upper limit according to the unit adjustment value, until the current node voltage does not exceed the upper limit;

[0035] The power backflow judgment module is used to calculate the sum of the current outputs of each distributed photovoltaic system when there is no node whose voltage exceeds the upper limit, and obtain the total output of the distributed photovoltaic system; and compare the total output of the distributed photovoltaic system with the total load of the substation;

[0036] The power backflow adjustment module is used to calculate the proportion of the current output of each distributed photovoltaic to the total output of the distributed photovoltaic when the total output of the distributed photovoltaic is greater than the total load of the area, and reduce the output of the distributed photovoltaic according to the proportion, the total load of the area and the minimum guaranteed output.

[0037] Based on the above method embodiment, the present invention provides a corresponding electronic device embodiment.

[0038] An embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the multi-distributed photovoltaic power control method for a distribution station area described in any one of the above method embodiments can be implemented.

[0039] Based on the above method item embodiments, the present invention provides a corresponding storage medium item embodiment.

[0040] An embodiment of the present invention provides a storage medium having a computer program stored thereon. When the computer program is executed by a processor, the multi-distributed photovoltaic power control method in a distribution station area described in any one of the above method embodiments can be implemented.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The embodiment of the present invention discloses a method, device, electronic device and storage medium for controlling multi-distributed photovoltaic power in a distribution station area. The method compares the real-time voltage value of each node in the area with a preset voltage upper limit to determine whether there is a node with a voltage exceeding the upper limit. When it is determined that there is a node with a voltage exceeding the upper limit, the unit adjustment value of each distributed photovoltaic is calculated according to the minimum guaranteed output and the current output of each distributed photovoltaic. According to the unit adjustment value, the corresponding distributed photovoltaic output is adjusted in sequence from near to far from the node with a voltage exceeding the upper limit until the current node voltage does not exceed the upper limit, thereby solving the problem of voltage exceeding the upper limit caused by excessive distributed photovoltaic output in the prior art. In addition, when the total output of distributed photovoltaics is greater than the total load of the area, for each distributed photovoltaic, the proportion of its current output to the total output of distributed photovoltaics is calculated, and the output is reduced according to the proportion, the total load of the area and the minimum guaranteed output. By reducing the output, the power reverse phenomenon caused by the output of distributed photovoltaic power generation exceeding user demand is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a flow chart of a method for controlling multi-distributed photovoltaic power in a distribution station area provided by an embodiment of the present invention.

[0044] Figure 2 It is a flow chart of a method for controlling multi-distributed photovoltaic power in a distribution station area provided by another embodiment of the present invention.

[0045] Figure 3 It is a structural schematic diagram of a multi-distributed photovoltaic power control device in a distribution station area provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] 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.

[0047] like Figure 1 As shown, an embodiment of the present invention provides a method for controlling multi-distributed photovoltaic power in a distribution station area, which at least includes the following steps:

[0048] Step S1, obtaining the real-time voltage value of each node in the control area, the distance from each distributed photovoltaic to any node, the rated capacity of each distributed photovoltaic, the current output of each distributed photovoltaic, the power supply radius of the area and the total load of the area;

[0049] The distance is a geographical distance; the nodes in the substation area include the substation head-end node and each user grid-connected node.

[0050] Step S2, calculating the minimum guaranteed output of each distributed photovoltaic according to the power supply radius of the substation, the distance from each distributed photovoltaic to the head-end node of the substation, and the rated capacity of each distributed photovoltaic;

[0051] In a preferred embodiment, the minimum guaranteed output of each distributed photovoltaic is calculated by the following formula:

[0052]

[0053] Among them, P bk Indicates the minimum guaranteed output; S k Indicates the rated capacity of distributed photovoltaics; d k It represents the distance from the distributed photovoltaic to the head end node of the substation; l represents the power supply radius of the substation; k represents the identifier of the distributed photovoltaic, and its maximum value is the number of distributed photovoltaic in the substation.

[0054] According to the formula, the farther the distributed photovoltaic is from the head end of the substation, the greater its minimum guaranteed output.

[0055] Step S3, comparing the real-time voltage value of each node in the substation with the preset voltage upper limit, and determining whether there is a node whose voltage exceeds the upper limit;

[0056] For each substation node, compare it with the preset voltage upper limit. If the real-time voltage value of the node is greater than the preset voltage upper limit, the node has a voltage exceeding the upper limit, that is, there is a node with a voltage exceeding the upper limit. If the real-time voltage value of the node is less than or equal to the preset voltage upper limit, the node does not have a voltage exceeding the upper limit. The preset voltage upper limit can be set according to the actual situation. Here, the value is 235V.

[0057] Step S4: If yes, for each node whose voltage exceeds the upper limit, the unit adjustment value of each distributed photovoltaic is calculated according to the minimum guaranteed output and the current output of each distributed photovoltaic, and the corresponding distributed photovoltaic output is adjusted in sequence according to the unit adjustment value in the order from near to far of the node whose voltage exceeds the upper limit until the current node voltage does not exceed the upper limit;

[0058] In an optional embodiment, the unit adjustment value of each distributed photovoltaic is calculated by the following formula:

[0059]

[0060] Among them, ΔS k Indicates the unit adjustment value; S nowk Represents the current output of distributed photovoltaics; P bk Indicates the minimum guaranteed output of distributed photovoltaics; NUM indicates the preset control unit; k indicates the identifier of distributed photovoltaics, and its maximum value is the number of distributed photovoltaics in the substation. The preset control unit NUM can be set according to actual conditions, and the value here is 10.

[0061] Specifically, in another preferred embodiment, the output of the corresponding distributed photovoltaic is adjusted in sequence according to the unit adjustment value in the order of the distributed photovoltaic distance from the node with the voltage exceeding the upper limit from near to far until the current node voltage does not exceed the upper limit, including: selecting a target distributed photovoltaic, and repeatedly performing the output adjustment operation until the current node voltage does not exceed the upper limit; wherein the starting target distributed photovoltaic is the distributed photovoltaic closest to the node with the current voltage exceeding the upper limit;

[0062] The output adjustment operation includes:

[0063] Determine whether the current output of the current target distributed photovoltaic is greater than its minimum guaranteed output.

[0064] If yes, calculate the difference between its current output and its unit adjustment value to obtain a second difference; compare the second difference with its minimum guaranteed output, and use the larger value as the updated value of the current output of the current target distributed photovoltaic; measure the real-time voltage value of the current node, and compare it with the preset voltage upper limit to determine whether the node voltage exceeds the upper limit;

[0065] If not, determine whether there are distributed photovoltaics that have not adjusted their output.

[0066] In the case of distributed photovoltaic power plants that have not adjusted their output, the distributed photovoltaic power plants that are closest to the current node and have not adjusted their output are selected as the updated target distributed photovoltaic power plants;

[0067] In the absence of distributed photovoltaic power generation with unadjusted output, the system enters the alarm state.

[0068] It should be noted that by reducing the output of each distributed photovoltaic system, the voltage value of each node in the distribution station area can be reduced, and overall coordinated regulation can be achieved, avoiding the problem that the distributed photovoltaic systems are difficult to work together when dealing with grid fluctuations due to isolated regulation modes, thereby reducing the overall regulation capacity and efficiency of the grid.

[0069] In a preferred embodiment, in a typical operating day, there are two nodes in the substation where the voltage exceeds the upper limit, which are numbered point1 and point2 in order from near to far from the head end, and their voltage values ​​are U1=262V and U2=245V respectively; there are three distributed photovoltaics, which are numbered PV1, PV2, and PV3 in order from near to far from the head end, and the corresponding distributed photovoltaic output is adjusted until the voltage of nodes point1 and pount2 does not exceed the upper limit.

[0070] First, calculate the minimum guaranteed output of each distributed photovoltaic power station and obtain P b1 =20kW, P b2 =37kW, P b3 =12kW, and obtain the current output S of each distributed photovoltaic now1 =42kW, S now2 =75kW, S now3 =93kW. The unit adjustment values ​​of each distributed photovoltaic are calculated to obtain ΔS1=2.2kW, ΔS2=3.4kW, ΔS3=8.1kW, the preset control unit NUM value is 10, and the preset voltage upper limit value is 235V.

[0071] The voltage of the first node point1 that exceeds the upper limit is adjusted. The order of the three distributed photovoltaics from near to far from this node is PV2, PV1, and PV3.

[0072] The output of PV2 was reduced to 37kW, and it was monitored that U1 = 238V. Since the output had reached the minimum guaranteed output of the distributed photovoltaic system, it could not be further reduced.

[0073] The output of PV1 is reduced to 31kW, and it is monitored that U1=234V. Therefore, the problem of the voltage exceeding the upper limit of the first voltage node point1 is solved.

[0074] Then adjust the voltage of the second voltage exceeding the upper limit node point2. The order of the three distributed photovoltaics from near to far from this node is PV3, PV1, and PV2.

[0075] The output of PV3 is reduced to 28.2kW, and it is monitored that U2=235V. Therefore, the problem of the voltage exceeding the upper limit of the second voltage node point2 is solved.

[0076] Step S5: If not, calculate the sum of the current outputs of each distributed photovoltaic system to obtain the total output of distributed photovoltaic systems; compare the total output of distributed photovoltaic systems with the total load of the area;

[0077] The current output of each distributed photovoltaic is added together, and the result obtained is the total distributed photovoltaic processing of the distribution station area. The total distributed photovoltaic output is then compared with the total load of the station area, and corresponding steps are executed according to the comparison result.

[0078] Step S6: When the total output of distributed photovoltaics is greater than the total load of the substation, for each distributed photovoltaic, calculate the proportion of its current output to the total output of distributed photovoltaics, and reduce the output of the distributed photovoltaics according to the proportion, the total load of the substation and the minimum guaranteed output.

[0079] Preferably, the calculating the ratio of the current output to the total output of the distributed photovoltaic power generation, and reducing the output of the distributed photovoltaic power generation according to the ratio, the total load of the area and the minimum guaranteed output, includes:

[0080] Calculate the ratio of the current output of the distributed photovoltaic system to the total output of the distributed photovoltaic system, and use the obtained ratio as the control ratio of the distributed photovoltaic system;

[0081] Calculate the difference between the total output of the distributed photovoltaic power plant and the total load of the substation to obtain a third difference; calculate the product of the third difference and the regulation proportion to obtain a product result, and use the product result as the regulation power of the distributed photovoltaic power plant;

[0082] The difference between the current output of the current distributed photovoltaic system and the regulated power is calculated to obtain a fourth difference; and the current output of the current distributed photovoltaic system is adjusted to a larger value between the fourth difference and the minimum guaranteed output.

[0083] It should be noted that the current output of the current distributed photovoltaic is adjusted to the larger value between the fourth difference and its minimum guaranteed output because when the fourth difference is greater than the minimum guaranteed output, it means that after reducing the output based on the current control power, the output of the distributed photovoltaic is still higher than its minimum guaranteed output, and the stable operation of the distributed photovoltaic can be maintained. On the contrary, if the fourth difference is less than the minimum guaranteed output, it means that after reducing the output based on the current control power, the output of the distributed photovoltaic is already lower than its minimum guaranteed output. If the output is reduced according to the value of the control power, it will lead to abnormal operation of the distributed photovoltaic. Therefore, the output can only be adjusted to the minimum guaranteed output of the distributed photovoltaic at this time.

[0084] like Figure 2 As shown, another embodiment of the present invention provides a method for controlling multi-distributed photovoltaic power in a distribution station area, which includes the following steps after step S6 in addition to steps S1 to S6 of the above embodiment:

[0085] Step S7: When the total output of distributed photovoltaic power generation is less than or equal to the total load of the substation, for each distributed photovoltaic power generation, calculate the proportion of its current output to the total output of distributed photovoltaic power generation, and increase the output of the distributed photovoltaic power generation according to the proportion and the total load of the substation.

[0086] In actual operation, the calculation of the proportion of the current output to the total output of distributed photovoltaic power generation and the increase of the output of the distributed photovoltaic power generation according to the proportion and the total load of the area include:

[0087] Calculate the ratio of the current output of the distributed photovoltaic system to the total output of the distributed photovoltaic system, and use the obtained ratio as the control ratio of the distributed photovoltaic system;

[0088] Calculate the difference between the total load of the area and the total output of the distributed photovoltaics to obtain the fifth difference; calculate the regulated power of the distributed photovoltaics based on the fifth difference and the regulation ratio; adjust the current output of the current distributed photovoltaics to the sum of the regulated power and the current output of the current distributed photovoltaics.

[0089] It should be noted that when the total output of distributed photovoltaic power generation is less than or equal to the total load of the substation, the distributed photovoltaic power generation is increased because when the load demand of the substation exceeds the power generation output of distributed photovoltaic power generation, the substation will demand additional electricity from the power grid, which will lead to excessive dependence on the power grid, increase the burden on the power grid, and reduce the operation independence and energy efficiency of the substation. In the long run, this dependence may not only increase the pressure on the power grid, but also cause the substation to be unable to effectively respond when the power grid is abnormal or the load peaks, affecting the stability and reliability of power supply. At this time, the purpose of increasing the output of distributed photovoltaic power generation is to reduce the power demanded by the substation from the power grid and improve the operation independence and energy efficiency of the substation.

[0090] Based on the above method embodiment, the present invention provides a corresponding device embodiment.

[0091] like Figure 3 As shown, an embodiment of the present invention provides a multi-distributed photovoltaic power control device in a distribution station area, including: a data acquisition module 101, a minimum guaranteed output generation module 102, an over-limit judgment module 103, an over-limit adjustment module 104, a power backflow judgment module 105 and a power backflow adjustment module 106.

[0092] The data acquisition module 101 is used to obtain the real-time voltage value of each node in the control area, the distance from each distributed photovoltaic to any node, the rated capacity of each distributed photovoltaic, the current output of each distributed photovoltaic, the power supply radius of the area and the total load of the area;

[0093] The minimum guaranteed output generation module 102 is used to calculate the minimum guaranteed output of each distributed photovoltaic according to the power supply radius of the substation, the distance from each distributed photovoltaic to the head end node of the substation, and the rated capacity of each distributed photovoltaic;

[0094] The over-limit judgment module 103 is used to compare the real-time voltage value of each node in the substation with the preset voltage upper limit to determine whether there is a node whose voltage exceeds the upper limit;

[0095] The over-limit adjustment module 104 is used to calculate the unit adjustment value of each distributed photovoltaic according to the minimum guaranteed output and the current output of each distributed photovoltaic when there is a node with a voltage exceeding the upper limit, and adjust the corresponding distributed photovoltaic output in order from near to far from the node with a voltage exceeding the upper limit according to the unit adjustment value until the current node voltage does not exceed the upper limit;

[0096] The power backflow judgment module 105 is used to calculate the sum of the current outputs of each distributed photovoltaic system when there is no node with a voltage exceeding the upper limit, and obtain the total output of the distributed photovoltaic system; and compare the total output of the distributed photovoltaic system with the total load of the substation;

[0097] The power backflow adjustment module 106 is used to calculate the ratio of the current output of each distributed photovoltaic to the total output of the distributed photovoltaic when the total output of the distributed photovoltaic is greater than the total load of the substation, and reduce the output of the distributed photovoltaic according to the ratio, the total load of the substation and the minimum guaranteed output.

[0098] It should be noted that the embodiments of the device described above correspond to the above embodiments of the present invention, and can implement any of the methods described above in the present invention. In addition, the embodiments of the above-mentioned device are merely schematic, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0099] Based on the above method embodiment of the present invention, a corresponding electronic device embodiment is provided.

[0100] An embodiment of the present invention provides an electronic device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the multi-distributed photovoltaic power control method for a distribution station area described in any one of the present invention is implemented, or when the processor executes the computer program, the functions of each module in the above-mentioned device embodiments are implemented.

[0101] Exemplarily, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program in the terminal device.

[0102] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0103] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0104] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the terminal device by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0105] Based on the above method embodiment, the present invention provides a storage medium embodiment;

[0106] Another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute any of the above-mentioned multi-distributed photovoltaic power control methods in the distribution station area of ​​the present invention.

[0107] The storage medium is a computer-readable storage medium, and the computer program includes computer program code, which may be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0108] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0109] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for controlling multi-distributed photovoltaic power in a distribution area, characterized in that: include: Obtain the real-time voltage value of each node in the control area, the distance from each distributed photovoltaic to any node, the rated capacity of each distributed photovoltaic, the current output of each distributed photovoltaic, the power supply radius of the area and the total load of the area; Calculate the minimum guaranteed output of each distributed photovoltaic system based on the power supply radius of the substation, the distance from each distributed photovoltaic system to the head end node of the substation, and the rated capacity of each distributed photovoltaic system; Compare the real-time voltage value of each node in the substation with the preset voltage upper limit to determine whether there is a node whose voltage exceeds the upper limit; If so, for each node whose voltage exceeds the upper limit, calculate the unit adjustment value of each distributed photovoltaic system based on the minimum guaranteed output and the current output of each distributed photovoltaic system. Based on the unit adjustment value, adjust the output of the corresponding distributed photovoltaic system in order from the nearest to the node whose voltage exceeds the upper limit until the voltage of the current node does not exceed the upper limit. If not, calculate the sum of the current outputs of each distributed photovoltaic system to obtain the total output of distributed photovoltaic systems; compare the total output of distributed photovoltaic systems with the total load of the substation; When the total output of distributed photovoltaics is greater than the total load of the substation, for each distributed photovoltaic, the proportion of its current output to the total output of distributed photovoltaics is calculated, and the output of the distributed photovoltaic is reduced according to the proportion, the total load of the substation and the minimum guaranteed output.

2. The multi-distributed photovoltaic power control method for a distribution station area according to claim 1, characterized in that: Also includes: When the total output of distributed photovoltaics is less than or equal to the total load of the substation, for each distributed photovoltaic, calculate the proportion of its current output to the total output of distributed photovoltaics, and increase the output of the distributed photovoltaic according to the proportion and the total load of the substation.

3. The multi-distributed photovoltaic power control method for a distribution station area according to claim 1, characterized in that: The calculation of the minimum guaranteed output of each distributed photovoltaic system based on the power supply radius of the substation, the distance from each distributed photovoltaic system to the head-end node of the substation, and the rated capacity of each distributed photovoltaic system includes: For each distributed photovoltaic, calculate the quotient of the distance from the distributed photovoltaic to the head end node of the substation and the power supply radius of the substation to obtain a first value; The minimum guaranteed output of the distributed photovoltaic system is calculated based on the first value and the rated capacity of the distributed photovoltaic system.

4. The multi-distributed photovoltaic power control method for a distribution station area according to claim 1, characterized in that: The calculating the unit adjustment value of each distributed photovoltaic system according to the minimum guaranteed output and the current output of each distributed photovoltaic system includes: For each distributed photovoltaic system, calculate the difference between its current output and the corresponding minimum guaranteed output to obtain a first difference value; The unit regulation value of the distributed photovoltaic is calculated based on the first difference and the preset regulation unit.

5. The multi-distributed photovoltaic power control method for a distribution station area according to claim 1, characterized in that: The step of adjusting the corresponding distributed photovoltaic outputs according to the unit adjustment value in order of proximity to the node whose voltage exceeds the upper limit, until the voltage of the current node does not exceed the upper limit, includes: Select the target distributed photovoltaic power plant and repeatedly adjust the output until the current node voltage does not exceed the upper limit. The starting target distributed photovoltaic power plant is the distributed photovoltaic power plant closest to the node where the current voltage exceeds the upper limit. The output adjustment operation includes: Determine whether the current output of the target distributed photovoltaic system is greater than its minimum guaranteed output. If so, calculate the difference between its current output and its unit adjustment value to obtain a second difference; adjust the current output of the current target distributed photovoltaic to the larger value of the second difference and its minimum guaranteed output; measure the real-time voltage value of the current node, and compare it with the preset voltage upper limit to determine whether the node voltage exceeds the upper limit; If not, determine whether there is distributed photovoltaic power generation that has not adjusted its output. In the case of distributed photovoltaics that have not adjusted their output, the distributed photovoltaics that are closest to the current node and have not adjusted their output are selected as the updated target distributed photovoltaics; In the absence of distributed photovoltaic power generation with unadjusted output, the system enters the alarm state.

6. The multi-distributed photovoltaic power control method for a distribution station area according to claim 1, characterized in that: The calculating the ratio of the current output to the total output of the distributed photovoltaic system, and reducing the output of the distributed photovoltaic system according to the ratio, the total load of the area, and the minimum guaranteed output, includes: Calculate the ratio of the current output of the distributed photovoltaic system to the total output of the distributed photovoltaic system, and use the obtained ratio as the control ratio of the distributed photovoltaic system; Calculate the difference between the total output of the distributed photovoltaic system and the total load of the substation to obtain a third difference; calculate the regulated power of the distributed photovoltaic system based on the third difference and the regulation ratio; The difference between the current output of the current distributed photovoltaic system and the regulated power is calculated to obtain a fourth difference; and the current output of the current distributed photovoltaic system is adjusted to a larger value between the fourth difference and the minimum guaranteed output.

7. The multi-distributed photovoltaic power control method for a distribution station area according to claim 2, characterized in that: The calculating the ratio of the current output to the total output of the distributed photovoltaic system, and increasing the output of the distributed photovoltaic system according to the ratio and the total load of the area, includes: Calculate the ratio of the current output of the distributed photovoltaic system to the total output of the distributed photovoltaic system, and use the obtained ratio as the control ratio of the distributed photovoltaic system; Calculate the difference between the total load of the substation and the total output of the distributed photovoltaic system to obtain a fifth difference; calculate the regulated power of the distributed photovoltaic system based on the fifth difference and the regulation ratio; adjust the current output of the current distributed photovoltaic system to the sum of the regulated power and the current output of the current distributed photovoltaic system.

8. A multi-distributed photovoltaic power control device for a distribution station area, characterized in that: include: Data acquisition module, minimum guaranteed output generation module, over-limit judgment module, over-limit adjustment module, power backflow judgment module and power backflow adjustment module; The data acquisition module is used to obtain the real-time voltage value of each node in the control area, the distance from each distributed photovoltaic to any node, the rated capacity of each distributed photovoltaic, the current output of each distributed photovoltaic, the power supply radius of the area and the total load of the area; The minimum guaranteed output generation module is used to calculate the minimum guaranteed output of each distributed photovoltaic according to the power supply radius of the substation, the distance from each distributed photovoltaic to the head end node of the substation, and the rated capacity of each distributed photovoltaic; The over-limit judgment module is used to compare the real-time voltage value of each node in the substation with the preset voltage upper limit to determine whether there is a node whose voltage exceeds the upper limit; The over-limit adjustment module is configured to, when there is a node whose voltage exceeds the upper limit, calculate, for each node whose voltage exceeds the upper limit, a unit adjustment value of each distributed photovoltaic system based on the minimum guaranteed output and the current output of each distributed photovoltaic system, and adjust the output of the corresponding distributed photovoltaic system in order of proximity to the node whose voltage exceeds the upper limit, from nearest to furthest, according to the unit adjustment value, until the voltage of the current node does not exceed the upper limit; The power backflow judgment module is used to calculate the sum of the current outputs of each distributed photovoltaic system when there is no node with a voltage exceeding the upper limit, to obtain the total output of the distributed photovoltaic system; and compare the total output of the distributed photovoltaic system with the total load of the substation; The power backflow adjustment module is used to calculate the proportion of the current output of each distributed photovoltaic to the total output of the distributed photovoltaic when the total output of the distributed photovoltaic is greater than the total load of the substation, and reduce the output of the distributed photovoltaic according to the proportion, the total load of the substation and the minimum guaranteed output.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the multi-distributed photovoltaic power control method for a distribution station area as described in any one of claims 1 to 7 can be implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it can implement the multi-distributed photovoltaic power control method for a distribution station area as described in any one of claims 1 to 7.

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