Power distribution network power control method and system, intelligent equipment and readable storage medium

Abstract

The invention relates to the technical field of power grid power, in particular to a power distribution network power control method and system, intelligent equipment and a readable storage medium, and aims to solve the technical problems of ensuring power maximization and realizing lowest cost of a power distribution network while realizing zero static error of voltage control of the power distribution network. In order to achieve the purpose, according to the power distribution network attributes of the power distribution network, the power compensation strategy of the power distribution network can be determined, according to the power distribution network voltage and the power compensation strategy, the power compensation instruction of the power distribution network is obtained, and according to the power compensation instruction, power control is performed on the power distribution network. Different power compensation strategies are determined, and a power compensation instruction is obtained according to the voltage of the power distribution network and the power compensation strategies, so that power compensation of the power distribution network is realized, power control of the power distribution network is realized, zero-static-error adjustment of the voltage of the power distribution network can be realized, and the power compensation efficiency is improved on the premise of ensuring that the voltage of the power distribution network is not out of limit. The voltage and power coordination control of the power distribution network is realized, and the benefit maximization of the power distribution network is ensured.

Description

Technical Field

[0001] The present application relates to the field of power grid technology, and in particular to a power control method, system, intelligent device and readable storage medium for a distribution network. Background Art

[0002] After 2020, electric vehicles will also enter a period of rapid growth. In first-tier cities with a high penetration rate of electric vehicles, the impact of charging and swapping loads on the distribution network has begun to emerge. Many service areas or charging and swapping stations are equipped with additional energy storage or photovoltaic power generation to deal with the problem of insufficient capacity. However, this also brings about voltage problems in distribution lines. The voltage of the distribution network will fluctuate with the operation of distributed power sources such as photovoltaics and bidirectional equipment. Especially when the photovoltaic output is large, the line voltage rises, the equipment voltage exceeds the limit and the protection is offline. When there are different types of distributed power sources in the distribution network, coordinating the control of each power source to maintain the voltage of the distribution network within the limit and achieve maximum benefits at the same time becomes a problem that needs to be solved urgently.

[0003] The main means of power control for bidirectional devices or distributed power sources on the market currently include:

[0004] 1. It does not directly control the distribution network or the terminal voltage, but only controls reactive power or power factor, and relies on the reactive power or power factor instructions given by the upper-level controller;

[0005] 2. When multiple distributed power sources exist, active power is distributed among multiple devices through the active power-voltage droop characteristics;

[0006] 3. When the voltage exceeds a certain range, the preset power reduction curve is used to avoid further increase in voltage.

[0007] However, these voltage-related power control methods are all controlled with static errors, that is, when reverse power causes voltage to exceed the limit (overvoltage), the above methods cannot accurately control the voltage of the distribution network to the threshold when the system reaches steady state, and it is usually slightly lower than the threshold. Therefore, in fact, the reverse power under the distribution network can still be adjusted up a little, and there is still room to increase power generation to obtain more income.

[0008] Accordingly, the art needs a new power distribution network control solution to solve the above problems. Summary of the invention

[0009] In order to overcome the above-mentioned defects, the present application is proposed to solve or at least partially solve the technical problem of how to achieve zero static error in the distribution network while ensuring maximum power and achieving the lowest cost of the distribution network.

[0010] In a first aspect, a power distribution network power control method is provided, the method comprising:

[0011] Determining a power compensation strategy for the distribution network according to the distribution network attributes of the distribution network;

[0012] Acquiring a power compensation instruction of the distribution network according to the distribution network voltage of the distribution network and the power compensation strategy;

[0013] The power distribution network is power controlled according to the power compensation instruction.

[0014] In a technical solution of the above-mentioned power control method for the distribution network, the step of obtaining the power compensation instruction of the distribution network according to the distribution network voltage of the distribution network and the power compensation strategy includes:

[0015] Comparing the distribution network voltage with a preset voltage threshold;

[0016] When the distribution network voltage is greater than the voltage threshold, the power compensation instruction is obtained according to the power compensation strategy.

[0017] In a technical solution of the above-mentioned power distribution network power control method, the obtaining of the power compensation instruction according to the power compensation strategy includes:

[0018] According to the power compensation strategy, based on the difference between the power distribution network voltage and the voltage threshold, the difference is limited to obtain the power compensation instruction.

[0019] In a technical solution of the above-mentioned power distribution network power control method, the power compensation strategy includes a reactive power compensation strategy and an active power compensation strategy; the power compensation instruction includes a reactive current compensation instruction and an active current compensation instruction;

[0020] Obtaining the power compensation instruction includes:

[0021] When the power compensation strategy is a reactive power compensation strategy, obtaining the reactive current compensation instruction;

[0022] When the power compensation strategy is an active power compensation strategy, the active current compensation instruction is obtained.

[0023] In a technical solution of the above-mentioned power control method for distribution network, the distribution network attributes include line attributes of the distribution network;

[0024] The step of determining the power compensation strategy of the distribution network according to the distribution network attributes of the distribution network includes:

[0025] A power compensation strategy for the distribution network is determined according to line attributes of the distribution network.

[0026] In a technical solution of the above-mentioned power control method for the distribution network, determining the power compensation strategy of the distribution network according to the line attributes of the distribution network includes:

[0027] If the line attribute of the distribution network is an inductive line, determining that the power compensation strategy is a reactive power compensation strategy;

[0028] If the line attribute of the distribution network is a resistive line, the power compensation strategy is determined to be an active power compensation strategy.

[0029] In a technical solution of the above-mentioned power distribution network control method, the distribution network attribute includes the cost per kilowatt-hour of the distribution network;

[0030] The step of determining the power compensation strategy of the distribution network according to the distribution network attributes of the distribution network includes:

[0031] A power compensation strategy for the distribution network is determined according to the electricity cost per kilowatt-hour of the distribution network.

[0032] In a technical solution of the above-mentioned power control method for the distribution network, determining the power compensation strategy of the distribution network according to the electricity cost per kilowatt-hour of the distribution network includes:

[0033] For the distribution network whose per-kilowatt-hour cost is greater than or equal to the preset cost, determining that the power compensation strategy is an active power compensation strategy;

[0034] For the distribution network whose cost per kilowatt-hour is less than a preset cost, the power compensation strategy is determined to be a reactive power compensation strategy.

[0035] In a technical solution of the above-mentioned power control method for distribution network, the distribution network attributes include the order in which the compensation strategies of the distribution network are put into use;

[0036] The step of determining the power compensation strategy of the distribution network according to the distribution network attributes of the distribution network includes:

[0037] The power compensation strategy of the distribution network is determined according to the order in which the compensation strategies of the distribution network are put into use.

[0038] In a technical solution of the above-mentioned power control method for the distribution network, the power control of the distribution network according to the power compensation instruction includes:

[0039] Power control is performed on the distribution network according to the original power command of the distribution network and the power compensation command.

[0040] In a technical solution of the above-mentioned power control method for the distribution network, the power control of the distribution network according to the original power instruction of the distribution network and the power compensation instruction includes:

[0041] According to the voltage and current sampling results of the distribution network, the original power instruction is subjected to droop control and / or amplitude limiting control to obtain a first power control instruction;

[0042] Power control is performed on the power distribution network according to the first power control instruction and the power compensation instruction.

[0043] In a second aspect, a power distribution network power control system is provided, the system comprising:

[0044] A power compensation strategy selection module, configured to determine a power compensation strategy for the distribution network according to a distribution network attribute of the distribution network;

[0045] A power compensation instruction generating module, configured to obtain a power compensation instruction of the distribution network according to the distribution network voltage of the distribution network and the power compensation strategy;

[0046] A power control module is configured to perform power control on the power distribution network according to the power compensation instruction.

[0047] In a third aspect, a smart device is provided, comprising at least one processor; and a memory communicatively connected to the at least one processor; wherein a computer program is stored in the memory, and when the computer program is executed by the at least one processor, the method described in any one of the technical solutions of the above-mentioned distribution network power control method is implemented.

[0048] In a fourth aspect, a computer-readable storage medium is provided, wherein a plurality of program codes are stored therein, wherein the program codes are suitable for being loaded and run by a processor to execute the method described in any one of the technical solutions of the above-mentioned distribution network power control method.

[0049] Solution 1. A power distribution network control method, characterized in that the method comprises:

[0050] Determining a power compensation strategy for the distribution network according to the distribution network attributes of the distribution network;

[0051] Acquiring a power compensation instruction of the distribution network according to the distribution network voltage of the distribution network and the power compensation strategy;

[0052] The power distribution network is power controlled according to the power compensation instruction.

[0053] Solution 2. The power distribution network control method according to Solution 1 is characterized in that:

[0054] The acquiring the power compensation instruction of the distribution network according to the distribution network voltage of the distribution network and the power compensation strategy comprises:

[0055] Comparing the distribution network voltage with a preset voltage threshold;

[0056] When the distribution network voltage is greater than the voltage threshold, the power compensation instruction is obtained according to the power compensation strategy.

[0057] Solution 3. The power distribution network control method according to Solution 2 is characterized in that:

[0058] The acquiring the power compensation instruction according to the power compensation strategy includes:

[0059] According to the power compensation strategy, based on the difference between the power distribution network voltage and the voltage threshold, the difference is limited to obtain the power compensation instruction.

[0060] Solution 4. A power distribution network control method according to any one of Solutions 1 to 3, characterized in that:

[0061] The power compensation strategy includes a reactive power compensation strategy and an active power compensation strategy; the power compensation instruction includes a reactive current compensation instruction and an active current compensation instruction;

[0062] Obtaining the power compensation instruction includes:

[0063] When the power compensation strategy is a reactive power compensation strategy, obtaining the reactive current compensation instruction;

[0064] When the power compensation strategy is an active power compensation strategy, the active current compensation instruction is obtained.

[0065] Solution 5. The power control method for a distribution network according to Solution 1 is characterized in that the distribution network attribute includes line attributes of the distribution network;

[0066] The step of determining the power compensation strategy of the distribution network according to the distribution network attributes of the distribution network includes:

[0067] A power compensation strategy for the distribution network is determined according to line attributes of the distribution network.

[0068] Solution 6. The power distribution network control method according to Solution 5 is characterized in that:

[0069] The step of determining a power compensation strategy of the distribution network according to line attributes of the distribution network includes:

[0070] If the line attribute of the distribution network is an inductive line, determining that the power compensation strategy is a reactive power compensation strategy;

[0071] If the line attribute of the distribution network is a resistive line, the power compensation strategy is determined to be an active power compensation strategy.

[0072] Solution 7. The power control method for a distribution network according to Solution 1 is characterized in that the distribution network attribute includes a kilowatt-hour cost of the distribution network;

[0073] The step of determining the power compensation strategy of the distribution network according to the distribution network attributes of the distribution network includes:

[0074] A power compensation strategy for the distribution network is determined according to the electricity cost per kilowatt-hour of the distribution network.

[0075] Solution 8. The power distribution network control method according to Solution 7 is characterized in that:

[0076] The step of determining the power compensation strategy of the distribution network according to the electricity cost per kilowatt-hour of the distribution network comprises:

[0077] For the distribution network whose per-kilowatt-hour cost is greater than or equal to the preset cost, determining that the power compensation strategy is an active power compensation strategy;

[0078] For the distribution network whose cost per kilowatt-hour is less than a preset cost, the power compensation strategy is determined to be a reactive power compensation strategy.

[0079] Solution 9. The power control method for a distribution network according to Solution 1 is characterized in that the attributes of the distribution network include the order in which the compensation strategies of the distribution network are put into use;

[0080] The step of determining the power compensation strategy of the distribution network according to the distribution network attributes of the distribution network includes:

[0081] The power compensation strategy of the distribution network is determined according to the order in which the compensation strategies of the distribution network are put into use.

[0082] Solution 10. The power distribution network control method according to Solution 1 is characterized in that:

[0083] The performing power control on the distribution network according to the power compensation instruction includes:

[0084] Power control is performed on the distribution network according to the original power command of the distribution network and the power compensation command.

[0085] Solution 11. The power distribution network control method according to Solution 10 is characterized in that:

[0086] The performing power control on the distribution network according to the original power instruction of the distribution network and the power compensation instruction comprises:

[0087] According to the voltage and current sampling results of the distribution network, the original power instruction is subjected to droop control and / or amplitude limiting control to obtain a first power control instruction;

[0088] Power control is performed on the power distribution network according to the first power control instruction and the power compensation instruction.

[0089] Solution 12. A power distribution network control system, characterized in that the system comprises:

[0090] A power compensation strategy selection module, configured to determine a power compensation strategy for the distribution network according to a distribution network attribute of the distribution network;

[0091] A power compensation instruction generating module, configured to obtain a power compensation instruction of the distribution network according to the distribution network voltage of the distribution network and the power compensation strategy;

[0092] A power control module is configured to perform power control on the power distribution network according to the power compensation instruction.

[0093] Solution 13. A smart device, comprising:

[0094] at least one processor;

[0095] and, a memory communicatively coupled to the at least one processor;

[0096] Wherein, a computer program is stored in the memory, and when the computer program is executed by the at least one processor, the power control method for the distribution network described in any one of Schemes 1 to 11 is implemented.

[0097] Solution 14. A computer-readable storage medium storing a plurality of program codes, characterized in that the program codes are suitable for being loaded and run by a processor to execute the distribution network power control method described in any one of Solutions 1 to 11.

[0098] The above one or more technical solutions of the present application have at least one or more of the following beneficial effects:

[0099] In the implementation of the technical solution of the power control method of the distribution network provided by the present application, the present application can determine the power compensation strategy of the distribution network according to the distribution network attributes of the distribution network, obtain the power compensation instruction of the distribution network according to the distribution network voltage and the power compensation strategy, and perform power control on the distribution network according to the power compensation instruction. Through the above configuration method, the present application can determine different power compensation strategies based on different distribution network attributes, obtain power compensation instructions according to the distribution network voltage and the power compensation strategy, thereby realizing power compensation of the distribution network, and then realizing power control of the distribution network, and can realize zero-static error regulation of the distribution network voltage, and realize coordinated control of the distribution network under the premise of ensuring that the distribution network voltage does not exceed the limit, so as to ensure that the benefits of the distribution network are maximized. BRIEF DESCRIPTION OF THE DRAWINGS

[0100] The disclosure of the present application will become easier to understand with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. Among them:

[0101] Figure 1 It is a schematic flow chart of main steps of a power distribution network control method according to an embodiment of the present application;

[0102] Figure 2 It is a schematic diagram of the main connection relationship of the lines and equipment of the distribution network;

[0103] Figure 3 It is a flow chart of the main steps of the distribution network droop control process;

[0104] Figure 4 It is a schematic diagram of the droop characteristic curve of the distribution network;

[0105] Figure 5 It is a flow chart of the main steps of the voltage-active power derating control process of the distribution network;

[0106] Figure 6 It is a schematic diagram of the voltage-active power derating curve of the distribution network;

[0107] Figure 7 It is a schematic flow chart of the main steps of a power distribution network control process according to an implementation method of an embodiment of the present application;

[0108] Figure 8 It is a schematic diagram of the main modules of the power distribution network control process according to an implementation method of an embodiment of the present application;

[0109] Fig. 9 This is a block diagram of the main components of a power distribution network control system according to an embodiment of the present application;

[0110] Fig.10It is a schematic diagram of the main structure of a smart device according to an embodiment of the present application.

[0111] Reference numerals:

[0112] 11: memory; 12: processor. DETAILED DESCRIPTION

[0113] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0114] In the description of the present application, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, memory, and may also include software parts, such as program code, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware or a combination of the two. Computer-readable storage media include any suitable medium that can store program code, such as a disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B or A and B. The term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B" and may include only A, only B or A and B. The singular terms "one" and "the" may also include plural forms.

[0115] The relevant user personal information that may be involved in the various embodiments of this application is strictly in accordance with the requirements of laws and regulations, following the principles of legality, legitimacy and necessity, based on the reasonable purposes of business scenarios, to process the personal information that users actively provide during the use of products / services or generated due to the use of products / services, as well as the personal information obtained with the user's authorization.

[0116] The user personal information processed by this application will vary depending on the specific product / service scenario, and shall be based on the specific scenario in which the user uses the product / service, and may involve the user's account information, device information, driving information, vehicle information or other related information. This application will treat the user's personal information and its processing with a high degree of diligence.

[0117] This application attaches great importance to the security of user personal information and has taken reasonable and feasible security protection measures that meet industry standards to protect user information and prevent personal information from being accessed, disclosed, used, modified, damaged or lost without authorization.

[0118] The following means are mainly used for the coordinated control of voltage and power of bidirectional station switching / charging piles:

[0119] 1. It does not directly control the distribution network or the terminal voltage. It is a simple reactive power control or power factor control, and relies on the reactive power or power factor instructions given by the upper-level controller.

[0120] 2. When multiple distributed power sources exist, the active power is distributed among multiple devices through the active power-voltage droop characteristics. Figure 3 and attached Figure 4 , Figure 3 It is a flow chart of the main steps of the distribution network droop control process; Figure 4 It is a schematic diagram of the droop characteristic curve of the distribution network. Figure 3 As shown, during the droop control process of the distribution network, the voltage and current of the distribution network can be sampled, and then the active power control of the distribution network can be realized based on the sum of the preset voltage-active power droop control command and the original power command. Figure 4 As shown, when the normalized voltage sampled by the distribution network exceeds the preset range, droop control is performed; when the normalized voltage sampled by the distribution network is lower than the preset range, power adjustment is also required to achieve protection of the distribution network and equipment.

[0121] 3. When the voltage exceeds a certain range, the preset power reduction curve is used to avoid further voltage increase. Figure 5 and attached Figure 6 , Figure 5 It is a flow chart of the main steps of the voltage-active power derating control process of the distribution network; Figure 6 This is a schematic diagram of the voltage-active power derating curve of the distribution network. Figure 5 As shown, during the distribution network derating (i.e., limiting) control process, the voltage and current of the distribution network can be sampled, and then the original power command can be limited based on the preset voltage-active power limiting value, thereby achieving active power control. Figure 6 As shown, when the normalized voltage sampled by the distribution network exceeds the preset range, the active power limit adjustment is performed; when the normalized voltage sampled by the distribution network is lower than the preset range, the active power limit adjustment is also required to achieve protection of the distribution network and equipment.

[0122] However, the above methods are all open-loop active power control based on voltage, and thus are control processes with static errors, that is, when reverse power causes voltage to exceed the limit (overvoltage), accurate control of the distribution network cannot be achieved.

[0123] Therefore, the art needs a new power distribution network control solution to solve the above problems.

[0124] See attached Figure 1 , Figure 1FIG. 1 is a flow chart of the main steps of a power distribution network control method according to an embodiment of the present application. Figure 1 As shown, the power distribution network control method in the embodiment of the present application mainly includes the following steps S101 to S103.

[0125] Step S101: determining a power compensation strategy for the distribution network according to the distribution network attributes of the distribution network.

[0126] In this embodiment, the power compensation strategy may be determined according to the properties of the power distribution network.

[0127] Please refer to the attached Figure 2 , Figure 2 This is a schematic diagram of the main connection relationship between the lines and equipment of the distribution network. Figure 2 As shown in Figure 1, the distribution network consists of multiple branches. Figure 2 The branches from top to bottom are photovoltaic power generation branch, two-way battery swap station branch, charging pile branch and local load branch.

[0128] In one implementation, the distribution network attributes may include line attributes, cost per kilowatt-hour, and the order of inputting compensation strategies. The line attributes may include inductive lines and resistive lines.

[0129] In one implementation, the power compensation strategy may include a reactive power compensation strategy and an active power compensation strategy. The reactive power compensation strategy refers to a strategy for compensating the reactive power of the distribution network. The active power compensation strategy refers to a strategy for compensating the active power of the distribution network.

[0130] Step S102: acquiring a power compensation instruction of the distribution network according to the distribution network voltage and power compensation strategy of the distribution network.

[0131] In this embodiment, the distribution network voltage may be monitored, and a power compensation instruction may be generated according to the distribution network voltage and a power compensation strategy.

[0132] In one implementation, for a reactive power compensation strategy, the corresponding power compensation instruction is a reactive power compensation instruction. For an active power compensation strategy, the corresponding power compensation instruction is an active power compensation instruction. The reactive power compensation instruction may be a negative reactive current instruction for reducing reactive power. The active power compensation instruction may be a negative active current instruction for reducing active power.

[0133] Step S103: Perform power control on the distribution network according to the power compensation instruction.

[0134] In this embodiment, power control of the power distribution network may be performed according to the power compensation instruction.

[0135] In one implementation, the power compensation instruction and the original power instruction of the power distribution network may be combined to perform power control on the power distribution network.

[0136] Based on the method described in the above steps S101 to S103, the embodiment of the present application can determine the power compensation strategy of the distribution network according to the distribution network attributes of the distribution network, obtain the power compensation instruction of the distribution network according to the distribution network voltage and the power compensation strategy, and perform power control on the distribution network according to the power compensation instruction. Through the above configuration method, the embodiment of the present application can determine different power compensation strategies based on different distribution network attributes, obtain power compensation instructions according to the distribution network voltage and the power compensation strategy, thereby realizing power compensation of the distribution network, and then realizing power control of the distribution network, and can realize zero-static error regulation of the distribution network voltage, and realize coordinated control of the distribution network under the premise of ensuring that the distribution network voltage does not exceed the limit, so as to ensure that the benefits of the distribution network are maximized.

[0137] Steps S101 to S103 are further described below.

[0138] In one implementation of the embodiment of the present application, the line properties of the distribution network may include inductive and resistive properties. Step S101 may further include the following steps S1011 and S1012:

[0139] Step S1011: if the line attribute of the distribution network is an inductive line, determine that the power compensation strategy is a reactive power compensation strategy.

[0140] Step S1012: If the line attribute of the distribution network is a resistive line, determine that the power compensation strategy is an active power compensation strategy.

[0141] In this embodiment, for the inductive line, it is more sensitive to reactive power, so reactive power compensation can be performed, and a reactive compensation strategy is selected. For the resistive line, it is more sensitive to active power, so active power compensation can be performed, and an active compensation strategy is selected. Among them, the inductive line is a line with mainly inductive properties (such as the line inductive reactance is greater than the line resistance). The resistive line is a line with relatively large resistance (such as the line resistance is greater than the line inductive reactance).

[0142] In another embodiment, step S101 may further include the following steps S1013 and S1014:

[0143] Step S1013: for a distribution network whose cost per kilowatt-hour is greater than or equal to a preset cost, determining that the power compensation strategy is an active power compensation strategy.

[0144] Step S1014: for a distribution network whose cost per kilowatt-hour is less than a preset cost, determining that the power compensation strategy is a reactive power compensation strategy.

[0145] In this embodiment, the cost per kilowatt-hour (i.e., the cost of power generation) of different distributed power sources in the distribution network can be considered. If it is greater than or equal to the preset cost, an active compensation strategy can be used; if it is less than the preset cost, a reactive compensation strategy can be used. That is, different power compensation strategies can be used for different distributed power sources. For example, the cost per kilowatt-hour of the energy storage system is usually higher than the cost per kilowatt-hour of photovoltaic power generation. Therefore, a reactive compensation strategy can be selected for the photovoltaic system, and an active compensation strategy can be selected for energy storage or bidirectional power exchange equipment. Those skilled in the art can set the value of the preset cost according to the needs of the actual application.

[0146] In a third implementation, step S101 may further include the following steps S1015:

[0147] Step S1015: Determine the power compensation strategy of the distribution network according to the order in which the compensation strategies of the distribution network are put into use.

[0148] In this embodiment, the order of inputting the compensation strategies of the power compensation strategy can be preset, so as to determine the power compensation strategy of the distribution network according to the order of inputting. For example, the distribution network uses the reactive power compensation strategy by default, and when the output of the reactive power compensation regulator reaches the output lower limit, the active power compensation strategy is input.

[0149] In one implementation of the embodiment of the present application, step S102 may further include the following steps S1021 and S1022:

[0150] Step S1021: Compare the power distribution network voltage with a preset voltage threshold.

[0151] Step S1022: when the distribution network voltage is greater than the voltage threshold, a power compensation instruction is obtained according to a power compensation strategy.

[0152] In this implementation, the distribution network voltage may be compared with a preset voltage threshold, and when the distribution network voltage is greater than the voltage threshold, a power compensation instruction may be obtained according to a power strategy.

[0153] For details, please refer to the attached Figure 8 , Figure 8 FIG. 1 is a schematic diagram of the main modules of the power distribution network control process according to an implementation method of an embodiment of the present application. Figure 8 As shown, Figure 8 The dotted box corresponding to number 1 is the reactive compensation branch, and the dotted box corresponding to number 2 is the active compensation branch. C10 and C11 are compensation controllers, where the compensation controller can be a PI controller. dCmd The corresponding branch is the reactive current control branch, which realizes reactive power control; I qCmdThe corresponding branch is the active current control branch to realize active power control. C20 and C21 are current loop controllers, C20 is used to realize active power control, and C21 is used to realize reactive power control. qFbk is the active current feedback, I dFbk It is reactive current feedback.

[0154] For reactive power compensation branches, when the power compensation strategy is reactive power compensation strategy, the distribution network voltage can be compared with the voltage threshold. If the distribution network voltage is higher than the voltage threshold, the voltage can be limited according to the difference between the distribution network voltage and the voltage threshold, thereby obtaining reactive current compensation instructions. Figure 8 As shown, the distribution network voltage can be U qCmd , where U qCmd is the per unit value of the voltage amplitude emitted by the converter of the distribution network. qCmd Compared with the preset voltage threshold 1.1, if it exceeds 1.1, C11 can generate a reactive power derating value (i.e. reactive current compensation instruction), and through the limiting link, limit the amplitude based on the derating value. lim2 =0, when the selected power compensation strategy is reactive power compensation strategy, you can set L lim2 ≠0.

[0155] For the active power compensation branch, when the power compensation strategy is the active power compensation strategy, the distribution network voltage can be compared with the voltage threshold. If the distribution network voltage is higher than the voltage threshold, the voltage can be limited according to the difference between the distribution network voltage and the voltage threshold, thereby obtaining the active current compensation instruction. Figure 8 As shown, the distribution network voltage can be V mag_pu , where V mag_pu It can be the per unit value of the voltage at the terminal of the distribution network equipment, or it can be the per unit value of the voltage at the line regulation point in the distribution network. mag_pu Compared with the preset voltage threshold 1.1, if it exceeds 1.1, C10 can generate an active power derating value (i.e., active power compensation instruction), and the limiting link can be used to implement the limiting based on the derating value. lim1 =0, when the selected power compensation strategy is reactive power compensation strategy, you can set L lim1 ≠0.

[0156] For power compensation strategy selection, when active power compensation is disabled, you can set L lim1 = 0; when reactive power compensation is disabled, it can be achieved by setting L lim2 =0 to achieve this.

[0157] In one implementation according to an embodiment of the present application, step S103 may further include the following steps S1031 and S1032:

[0158] Step S1031: performing droop control and / or amplitude limiting control on the original power instruction according to the voltage and current sampling results of the distribution network to obtain a first power control instruction.

[0159] Step S1032: Perform power control on the power distribution network according to the first power control instruction and the power compensation instruction.

[0160] In this embodiment, please refer to the attached Figure 7 , Figure 7 FIG. 1 is a flow chart of the main steps of a power distribution network control process according to an implementation method of an embodiment of the present application. Figure 7 As shown, the voltage and current of the distribution network can be sampled to obtain the voltage and current sampling results. Among them, the voltage and current measured at the outlet of the converter or inverter of the distribution network can be sampled. A preset voltage-active power droop control or a preset voltage-active power limit control can be performed based on the voltage and current sampling results. For the droop control result, it can be summed with the original power instruction. If the limit control is set, the summed power control instruction can be limited to obtain the first power control instruction. Different voltage power compensation strategies can be selected based on different distribution network attributes, and then the voltage power compensation instruction is generated according to the power compensation strategy. The power control of the distribution network can be performed based on the first power control instruction and the power compensation instruction. In this way, closed-loop power control based on the distribution network voltage can be realized, and the distribution network voltage is maintained within the maximum allowable range, ensuring that the distribution network voltage has no static error. At the same time, since different power compensation strategies can be selected for different distribution network attributes, different power compensation strategies can also be configured for different distributed power sources, thereby maximizing the benefits of the distribution network. The droop control and amplitude limiting control processes may be implemented using the droop control and amplitude limiting control methods commonly used in the art, and this application does not limit this.

[0161] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effect of the present application, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders. These adjusted schemes are equivalent to the technical schemes described in this application, and therefore will also fall within the scope of protection of this application.

[0162] It is understood by those skilled in the art that all or part of the processes in the method for implementing the above-mentioned embodiment of the present application can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium, etc. that can carry the computer program code.

[0163] Furthermore, the present application also provides a power distribution network power control system.

[0164] In an embodiment of a power distribution network control system according to the present application, see the attached Fig. 9 , Fig. 9 This is a block diagram of the main components of a power distribution network control system according to an embodiment of the present application. Fig. 9 As shown, the power control system of the distribution network can mainly include a power compensation strategy selection module, a power compensation instruction generation module and a power control module. In this embodiment, the power compensation strategy selection module can be configured to determine the power compensation strategy of the distribution network according to the distribution network attributes of the distribution network. The power compensation instruction generation module can be configured to obtain the power compensation instruction of the distribution network according to the distribution network voltage and power compensation strategy of the distribution network. The power control module can be configured to perform power control on the distribution network according to the power compensation instruction.

[0165] Another aspect of the present application also provides a computer-readable storage medium.

[0166] In an embodiment of a computer-readable storage medium according to the present application, the computer-readable storage medium may be configured to store a program for executing the power distribution network control method of the above-mentioned method embodiment, and the program may be loaded and run by a processor to implement the above-mentioned power distribution network control method. For ease of explanation, only the parts related to the embodiment of the present application are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present application. The computer-readable storage medium may be a storage device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiment of the present application is a non-temporary computer-readable storage medium.

[0167] Another aspect of the present application also provides a smart device.

[0168] In an embodiment of an intelligent device according to the present application, the intelligent device may include at least one processor; and a memory connected to the at least one processor in communication; wherein a computer program is stored in the memory, and when the computer program is executed by the at least one processor, the method described in any of the above embodiments is implemented. Fig.10 , Fig.10 FIG. 4 exemplarily shows that the memory 11 and the processor 12 are communicatively connected via a bus.

[0169] The smart device described in the present application may be, but is not limited to, a mobile phone, a tablet computer, a desktop, a laptop, a handheld computer, a notebook computer, a vehicle-mounted device, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), an augmented reality (AR)\virtual reality (VR) device, etc., and the embodiments of the present application are not limited to this.

[0170] So far, the technical solution of the present application has been described in conjunction with an embodiment shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A power distribution network control method, characterized in that: The method comprises: Determining a power compensation strategy for the distribution network according to the distribution network attributes of the distribution network; Acquiring a power compensation instruction of the distribution network according to the distribution network voltage of the distribution network and the power compensation strategy; The power distribution network is power controlled according to the power compensation instruction.

2. The power distribution network control method according to claim 1, characterized in that: The acquiring the power compensation instruction of the distribution network according to the distribution network voltage of the distribution network and the power compensation strategy comprises: Comparing the distribution network voltage with a preset voltage threshold; When the distribution network voltage is greater than the voltage threshold, the power compensation instruction is obtained according to the power compensation strategy.

3. The power distribution network control method according to claim 2, characterized in that: The acquiring the power compensation instruction according to the power compensation strategy includes: According to the power compensation strategy, based on the difference between the power distribution network voltage and the voltage threshold, the difference is limited to obtain the power compensation instruction.

4. The power distribution network control method according to any one of claims 1 to 3, characterized in that: The power compensation strategy includes a reactive power compensation strategy and an active power compensation strategy; the power compensation instruction includes a reactive current compensation instruction and an active current compensation instruction; Obtaining the power compensation instruction includes: When the power compensation strategy is a reactive power compensation strategy, obtaining the reactive current compensation instruction; When the power compensation strategy is an active power compensation strategy, the active current compensation instruction is obtained.

5. The power distribution network control method according to claim 1, characterized in that: The distribution network attributes include line attributes of the distribution network; The step of determining the power compensation strategy of the distribution network according to the distribution network attributes of the distribution network includes: A power compensation strategy for the distribution network is determined according to line attributes of the distribution network.

6. The power distribution network control method according to claim 5, characterized in that: The step of determining a power compensation strategy of the distribution network according to line attributes of the distribution network includes: If the line attribute of the distribution network is an inductive line, determining that the power compensation strategy is a reactive power compensation strategy; If the line attribute of the distribution network is a resistive line, the power compensation strategy is determined to be an active power compensation strategy.

7. The power distribution network control method according to claim 1, characterized in that: The distribution network attributes include the electricity cost of the distribution network; The step of determining the power compensation strategy of the distribution network according to the distribution network attributes of the distribution network includes: A power compensation strategy for the distribution network is determined according to the electricity cost per kilowatt-hour of the distribution network.

8. The power distribution network control method according to claim 7, characterized in that: The step of determining the power compensation strategy of the distribution network according to the electricity cost per kilowatt-hour of the distribution network comprises: For the distribution network whose per-kilowatt-hour cost is greater than or equal to the preset cost, determining that the power compensation strategy is an active power compensation strategy; For the distribution network whose cost per kilowatt-hour is less than a preset cost, the power compensation strategy is determined to be a reactive power compensation strategy.

9. The power distribution network control method according to claim 1, characterized in that: The distribution network attributes include the order in which the compensation strategies of the distribution network are put into use; The step of determining the power compensation strategy of the distribution network according to the distribution network attributes of the distribution network includes: The power compensation strategy of the distribution network is determined according to the order in which the compensation strategies of the distribution network are put into use.

10. The power distribution network control method according to claim 1, characterized in that: The performing power control on the distribution network according to the power compensation instruction includes: Power control is performed on the distribution network according to the original power command of the distribution network and the power compensation command.

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