Layered coordination control optimization method and device for medium and low voltage flexible interconnection power distribution system

Abstract

The invention discloses a hierarchical coordination control optimization method and device for a medium and low voltage flexible interconnection power distribution system, and relates to the technical field of power distribution optimization, and the method comprises the following steps: receiving electric energy related data, calculating the power supply quality through the electric energy related data, and determining the access upper limit of medium and low voltage flexible interconnection equipment based on the power supply quality; on the basis of the upper limit of access of the medium-low voltage flexible interconnection equipment, relevant operation data of the medium-low voltage flexible interconnection equipment are obtained, the relevant operation data of the medium-low voltage flexible interconnection equipment are input into a pre-established optimization four-layer model, a multi-target rime algorithm is used for solving, and a configuration result of the medium-low voltage flexible interconnection equipment is obtained. Through the multi-target rime algorithm, the bearing capacity of the power distribution network on the increment power utilization demand of the novel infrastructure is economically and efficiently improved, the cost efficiency is comprehensively considered, the medium-low voltage flexible interconnection equipment is connected into the power distribution network, the positive effect of the flexible interconnection system on the aspect of optimization operation is fully played, and the power flow optimization capacity of the power distribution network is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution optimization, specifically to a hierarchical coordinated control optimization method and device for a medium and low voltage flexible interconnected distribution system. Background Art

[0002] China vigorously promotes the construction of a "new energy system" and promotes the clean and low-carbon development of energy. The large-scale development of distributed new energy is not only the most powerful driving force but also an inevitable result of development. With the continuous increase in the penetration rate of distributed new energy, its inherent output uncertainty, diversity of access methods and power generation and grid connection modes have become increasingly prominent in affecting the distribution network, posing new challenges to the operation and dispatching of the distribution network. At the same time, in recent years, the state has strongly supported the development of electric vehicles, and the social demand for electric vehicle charging facilities has shown a rapid growth trend. The spatio-temporal uncertainty of electric vehicles has brought charging load demands with large scale, wide distribution, obvious temporal characteristics and reliability differences. As the last link of electric energy from production to users, the efficient consumption of various distributed energy sources, the flexible access of electric vehicles, as well as high-quality services and flexible interactions on the user side all need to be completed through the distribution network. The operation mode of traditional medium and low voltage distribution systems is single, capacity-limited, and the control means lack flexibility. They are insufficient in aspects such as balancing line power flow distribution, consuming distributed new energy, and ensuring system power quality, and are difficult to meet the development needs of new energy sources and loads.

[0003] To solve these problems, flexible interconnection technology has gradually come into view. Flexible interconnection devices can optimize the distribution between lines, achieve precise control, and at the same time improve distribution efficiency, save costs, and enhance the coordination ability of the distribution system. Therefore, constructing a flexible medium and low voltage distribution system and optimizing the distribution network system with flexible interconnection devices have become a research hotspot. Currently, the research on existing flexible interconnection devices is mostly limited to single-level power flow control, and the coordination problems between medium and low voltage distribution systems at multiple levels, multiple devices, multiple operating conditions, and multiple dimensions still cannot be well solved. Summary of the Invention

[0004] To solve the deficiencies mentioned in the above background art, the purpose of the present invention is to provide a hierarchical coordinated control optimization method and device for a medium and low voltage flexible interconnected distribution system.

[0005] In a first aspect, the purpose of the present invention can be achieved through the following technical solutions: A hierarchical coordinated control optimization method for a medium and low voltage flexible interconnected distribution system, the method comprising the following steps:

[0006] Receive power-related data, calculate the power supply quality using the power-related data, and determine the upper limit of the access of medium and low voltage flexible interconnection devices based on the power supply quality;

[0007] Based on the upper limit of the access of medium- and low-voltage flexible interconnection devices, relevant operation data of the medium-voltage flexible interconnection devices are obtained, and the relevant operation data of the medium-voltage flexible interconnection devices are input into a pre-established optimized four-layer model, and a multi-objective rime algorithm is used for solution to obtain the coordinated control optimization result of the medium- and low-voltage flexible interconnection devices.

[0008] Combined with the first aspect, in some implementation manners of the first aspect, the method further includes: the calculation process of calculating the power supply quality by using the power-related data:

[0009]

[0010] In the formula, η is the wire circuit efficiency, P b (t) is the total power that the circuit can carry, P pv (t) is the electric energy provided by renewable energy, P WT (t) is the electric energy provided by non-renewable energy, P l (t) is the total energy demand.

[0011] Combined with the first aspect, in some implementation manners of the first aspect, the method further includes: the working environment of the medium- and low-voltage flexible interconnection devices becomes a two-dimensional environment,

[0012] Combined with the first aspect, in some implementation manners of the first aspect, the method further includes: taking the minimum annual variance of the annual operation cost of the medium-voltage flexible interconnection devices and the load rate of the medium-voltage transformers as the goal, and planning the installation location of the medium-voltage flexible interconnection and the installation capacity of the low-voltage VSCs:

[0013] X min = X FIDL + X ELC

[0014] Among them, X min represents the minimum total cost, X fidl represents the annual cost of the device operation, X vld represents the starting position;

[0015]

[0016] In the formula, X 1 , X 2 …X n , Y 1 , Y 2 …Y n represent each medium-voltage flexible interconnection device, P i represents the position where each device is located, P best represents the optimal solution;

[0017]

[0018] In the formula, η represents the efficiency of the device, and P c is the rated power of the device, T represents the number of years of project operation, and n c (t) represents the number of cycles in the t-th year, r represents the discount rate, M(t) represents the operation and maintenance cost in the t-th year, and C E represents the storage cost.

[0019] Combined with the first aspect, in some implementation manners of the first aspect, the method further includes: after the medium-voltage flexible interconnection device confirms the position distribution, the medium-voltage flexible device is marked as an obstacle and placed in the two-dimensional environment, and with the lowest cost of the low-voltage flexible interconnection device and the total power cost as the goal, the installation position and capacity of the optimal low-voltage flexible interconnection device are obtained:

[0020] Y min = Y FIDL + Y ELC

[0021] In the formula, Y min represents the minimum total cost, Y fidl represents the annual cost of device operation, and Y ELC represents the optimal installation position of the device;

[0022]

[0023] In the formula, a 1 , a 2 …a n , b 1 , b 2 …b n represent each low-voltage flexible interconnection device, and P best1 represents the optimal solution;

[0024]

[0025] Combined with the first aspect, in some implementation manners of the first aspect, the method further includes: the constraint condition for the medium-voltage flexible interconnection device to access the distribution network is

[0026]

[0027] where P l (t) is the maximum power that can be transmitted in the circuit;

[0028] The constraint condition for the low-voltage flexible device to access the distribution network is

[0029]

[0030] where K is the maintenance coefficient of the renewable power generation unit.

[0031] In combination with the first aspect, in certain implementations of the first aspect, the method further includes: the four layers of the pre-established optimized four-layer model include: a communication layer, a command and decision-making layer, a real-time management layer, and a local device layer.

[0032] The four-layer model is optimized with the goal of minimizing the annual cost and optimizing the planning and configuration of medium- and low-voltage flexible interconnection devices, resulting in an optimized four-layer model.

[0033] In combination with the first aspect, in certain implementations of the first aspect, the method further includes: the calculation process of using the multi-objective rime algorithm to solve and obtain the coordinated control optimization result of medium- and low-voltage flexible interconnection devices:

[0034] First, an initial population is randomly generated, including a certain number of medium- and low-voltage flexible interconnection devices (solutions) and the optimal solution. Then, the positions are iteratively updated according to the formulas of X vld and Y ELC Subsequently, the fitness of each time is determined through the results of X min and Y min When the obtained result is the lowest compared to the previous five times and the next five times, the termination condition is satisfied, and this situation is the optimal solution.

[0035] In a second aspect, to achieve the above object, the present invention discloses a hierarchical coordinated control optimization device for a medium- and low-voltage flexible interconnection power distribution system, including:

[0036] A power supply calculation module, configured to receive power-related data, calculate the power supply quality using the power-related data, and determine the upper limit of the access of medium- and low-voltage flexible interconnection devices based on the power supply quality;

[0037] A device configuration module, configured to obtain the relevant operation data of medium-voltage flexible interconnection devices based on the upper limit of the access of medium- and low-voltage flexible interconnection devices, input the relevant operation data of medium-voltage flexible interconnection devices into the pre-established optimized four-layer model, and use the multi-objective rime algorithm to solve to obtain the coordinated control optimization result of medium- and low-voltage flexible interconnection devices.

[0038] Among them, the calculation process of the power supply calculation module calculating the power supply quality using the power-related data:

[0039]

[0040] In the formula, η is the wire circuit efficiency, P b (t) is the total power that the circuit can carry, P pv (t) is the electric energy provided by renewable energy, P WT (t) is the electric energy provided by non-renewable energy, P l (t) is the total energy demand;

[0041] The working environment of the medium- and low-voltage flexible interconnection device of the device configuration module becomes a two-dimensional environment.

[0042]

[0043] With the goal of minimizing the annual operating cost of the medium-voltage flexible interconnection device and the annual variance of the medium-voltage transformer load rate, plan the installation location of the medium-voltage flexible interconnection and the installation capacity of the low-voltage VSC:

[0044] X min = X FIDL + X ELC

[0045] Among them, X min represents the minimum total cost, X fidl represents the annual cost of equipment operation, X vld represents the starting position;

[0046]

[0047] In the formula, X 1 , X 2 … X n , Y 1 , Y 2 … Y n represent each medium-voltage flexible interconnection device, P i represents the location of each device, P best represents the optimal solution;

[0048]

[0049] In the formula, η represents the efficiency of the device, P c is the rated power of the device, T represents the number of years of the project work, n c (t) represents the number of cycles in the t-th year, r represents the discount rate, M(t) represents the operation and maintenance cost in the t-th year, C E represents the storage cost;

[0050] After the location distribution of the medium-voltage flexible interconnection device is confirmed, record the medium-voltage flexible device as an obstacle and place it in the two-dimensional environment. With the goal of the lowest cost of the low-voltage flexible interconnection device and the total power cost, obtain the installation location and capacity of the optimal low-voltage flexible interconnection device:

[0051] Y min = Y FIDL + Y ELC

[0052] In the formula, Y min represents the minimum total cost, Y fidl represents the annual cost of equipment operation, YELC Represents the best installation position of the device;

[0053]

[0054] In the formula, a 1 , a 2 …a n , b 1 , b 2 …b n represent each low-voltage flexible interconnection device, and P best1 represents the optimal solution;

[0055]

[0056] The constraint conditions for the medium-voltage flexible interconnection device to access the distribution network are

[0057]

[0058] Among them, P l (t) is the maximum transmissible power in the circuit;

[0059] The constraint conditions for the low-voltage flexible device to access the distribution network are:

[0060]

[0061] Among them, K is the maintenance coefficient of the renewable power generation unit;

[0062] The four layers of the pre-established optimal four-layer model of the device configuration module include: communication layer, command and decision-making layer, real-time management layer, and local device layer,

[0063] Taking the lowest annual cost and the optimal planning and configuration of medium- and low-voltage flexible interconnection devices as the goal, the four-layer model is optimized to obtain the optimized four-layer model;

[0064] The calculation process of using the multi-objective rime algorithm by the device configuration module to solve and obtain the coordinated control optimization result of the medium- and low-voltage flexible interconnection device:

[0065] Randomly generate an initial population, including a certain number of solutions and optimal solutions of medium- and low-voltage flexible interconnection devices; then update the position iteratively according to the formulas of X vld and Y ELC , and then determine the fitness of each time through the results of X min and Y min . When the obtained result is the lowest compared with the previous five times and the next five times, the termination condition is satisfied, and the obtained result is the optimal solution.

[0066] In another aspect of the present invention, in order to achieve the above object, a terminal device is disclosed, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor. The memory stores a computer program capable of running on the processor. When the processor loads and executes the computer program, the hierarchical coordinated control optimization method of the medium and low voltage flexible interconnected power distribution system as described above is adopted.

[0067] In yet another aspect of the present invention, in order to achieve the above object, a computer-readable storage medium is disclosed. The computer-readable storage medium stores a computer program. When the computer program is loaded and executed by a processor, the hierarchical coordinated control optimization method of the medium and low voltage flexible interconnected power distribution system as described above is adopted.

[0068] Advantages of the present invention:

[0069] Through the multi-objective rime algorithm, the present invention realizes economically and efficiently enhancing the bearing capacity of the existing power distribution network for the incremental electricity demand of new infrastructure. By comprehensively considering cost and efficiency and connecting medium and low voltage flexible interconnected devices to the power distribution network, the positive role of the flexible interconnected system in optimizing operation can be fully exerted, and the power flow optimization ability of the power distribution network can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for description in the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0071] Figure 1 It is a schematic flow chart of the method of the present invention;

[0072] Figure 2 It is a schematic diagram of the model structure of the present invention;

[0073] Figure 3 It is a schematic diagram of the device structure of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0074] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0075] Embodiment 1:

[0076] The following introduces the relevant terms related to the embodiments of the present application:

[0077] The section of the power system from the outlet of the step-down distribution substation (high-voltage distribution substation) to the user end is called the distribution system. The distribution system is a power network system composed of various distribution equipment (or components) and distribution facilities that transform voltage and directly distribute electric energy to end users.

[0078] As Figure 1 shown, the hierarchical coordinated control optimization method for medium- and low-voltage flexible interconnected distribution systems includes the following steps:

[0079] S101: Receive power-related data, calculate the power supply quality using the power-related data, and determine the upper limit of the access of medium- and low-voltage flexible interconnected equipment based on the power supply quality;

[0080] The calculation process of calculating the power supply quality using the power-related data:

[0081]

[0082] In the formula, η is the wire circuit efficiency, P b (t) is the total power that the circuit can carry, P pv (t) is the electric energy provided by renewable energy, P WT (t) is the electric energy provided by non-renewable energy, P l (t) is the total energy demand.

[0083] S102: Based on the upper limit of the access of medium- and low-voltage flexible interconnected equipment, obtain the relevant operation data of the medium-voltage flexible interconnected equipment, input the relevant operation data of the medium-voltage flexible interconnected equipment into the pre-established four-layer optimization model, and use the multi-objective rime algorithm for solution to obtain the coordinated control optimization result of the medium- and low-voltage flexible interconnected equipment.

[0084] The working environment of the medium- and low-voltage flexible interconnected equipment becomes a two-dimensional environment,

[0085]

[0086] Plan the installation location of the medium-voltage flexible interconnection and the installation capacity of the low-voltage VSC with the goal of minimizing the annual operation cost of the medium-voltage flexible interconnection equipment and the annual variance of the medium-voltage transformer load rate:

[0087] X min = X FIDL + X ELC

[0088] Among them, X min represents the minimum total cost, X fidl represents the annual cost of equipment operation, X vld represents the starting position;

[0089]

[0090] Wherein, X 1 、X 2 …X n , Y 1 、Y 2 …Y n represent each medium-voltage flexible interconnection device, P i represents the location where each device is located, P best represents the optimal solution;

[0091]

[0092] Wherein, η represents the efficiency of the device, P c is the rated power of the device, T represents the year in which the project operates, n c (t) represents the number of cycles in the t-th year, r represents the discount rate, M(t) represents the operation and maintenance cost in the t-th year, C E represents the storage cost.

[0093] After the location distribution of the medium-voltage flexible interconnection devices is confirmed, the medium-voltage flexible devices are marked as obstacles and placed in the two-dimensional environment. With the lowest cost of the low-voltage flexible interconnection devices and the total power cost as the objectives, the installation location and capacity of the optimal low-voltage flexible interconnection device are obtained:

[0094] Y min = Y FIDL + Y ELC

[0095] Wherein, Y min represents the minimum total cost, Y fidl represents the annual cost of device operation, Y ELC represents the optimal installation location of the device;

[0096]

[0097] Wherein, a 1 、a 2 …a n , b 1 、b 2 …b n represent each low-voltage flexible interconnection device, P best1 represents the optimal solution;

[0098]

[0099] The constraint conditions for the medium-voltage flexible interconnection device to access the distribution network are

[0100]

[0101] Among them, P l (t) is the maximum transmissible power in the circuit;

[0102] The constraint conditions for low-voltage flexible devices to access the distribution network are

[0103]

[0104] Among them, K is the maintenance coefficient of the renewable power generation unit.

[0105] The four layers of the pre-established optimized four-layer model include: the communication layer, the command and decision-making layer, the real-time management layer, and the local device layer.

[0106] Optimize the four-layer model with the goal of minimizing the annual cost and optimizing the planning and configuration of medium- and low-voltage flexible interconnection devices to obtain the optimized four-layer model.

[0107] The calculation process of using the multi-objective rime algorithm to solve and obtain the coordinated control optimization result of medium- and low-voltage flexible interconnection devices:

[0108] First, randomly generate the initial population, including a certain number of medium- and low-voltage flexible interconnection devices (solutions) and the optimal solution. Then, update the position iteratively according to the formulas of X vld and Y ELC . Subsequently, determine the fitness of each time through the results of X min and Y min . When the obtained result is the lowest compared with the previous five times and the next five times, the termination condition is satisfied, and this situation is the optimal solution.

[0109] Specifically, the solution of the present invention will be further elaborated through embodiments: By establishing a four-layer hierarchical model, hierarchical control and management are carried out on the economic benefits, network losses and efficiency, power quality, and equipment operation boundaries of the medium and low voltage distribution system, in order to obtain the overall optimum of the system. In the four-layer model, the top layer is the communication layer, including intelligent communication and intelligent connection, which is mainly responsible for transmitting information, integrating information, and overall calculating economic benefits. The latter three layers are the system controllers. The intelligent decision-making layer includes operation decision-making and intelligent management, which is mainly responsible for processing information and sending real-time instructions to the system to reduce network losses and improve efficiency; the real-time management layer includes monitoring equipment, data processing, and energy management, which is mainly responsible for detecting the system state in real time and processing and predicting data, and at the same time adjusting energy; the local equipment layer includes equipment control, which mainly controls the system equipment in real time to ensure power quality and at the same time ensure that the equipment operation does not exceed the limit. This four-layer model can realize the flexible coordination of resources at different levels, so as to take into account the complex working conditions of system operation, the spatio-temporal characteristics of large-scale access of multiple types of resources, and the power quality requirements of the flexible interconnected system, and can give full play to the positive role of the flexible interconnected system in optimizing operation, improve the power flow optimization ability of the distribution network, and meet the coordinated interaction of source-network-load-storage.

[0110] Embodiment 2: Second, in order to achieve the above object, the present invention discloses a hierarchical coordinated control and optimization device for a medium and low voltage flexible interconnected distribution system, including:

[0111] A power supply calculation module 11, configured to receive power-related data, calculate the power supply quality using the power-related data, and determine the upper limit of the access of medium and low voltage flexible interconnected devices based on the power supply quality;

[0112] An equipment configuration module 12, configured to obtain the relevant operation data of the medium voltage flexible interconnected equipment based on the upper limit of the access of the medium and low voltage flexible interconnected equipment, input the relevant operation data of the medium voltage flexible interconnected equipment into a pre-established optimized four-layer model, and use a multi-objective rime algorithm for solution to obtain the coordinated control and optimization result of the medium and low voltage flexible interconnected equipment.

[0113] Among them, the calculation process of the power supply calculation module 11 calculating the power supply quality using the power-related data:

[0114]

[0115] In the formula, η is the wire circuit efficiency, P b (t) is the total power that the circuit can carry, P pv (t) is the electric energy provided by renewable energy, P WT (t) is the electric energy provided by non-renewable energy, P l (t) is the total energy demand;

[0116] The working environment of the medium- and low-voltage flexible interconnection device of the device configuration module 12 becomes a two-dimensional environment.

[0117]

[0118] Taking the minimum annual operating cost of the medium-voltage flexible interconnection device and the annual variance of the medium-voltage transformer load rate as the objectives, plan the installation location of the medium-voltage flexible interconnection and the installation capacity of the low-voltage VSC:

[0119] X min = X FIDL + X ELC

[0120] Among them, X min represents the minimum total cost, X fidl represents the annual cost of equipment operation, X vld represents the starting position;

[0121]

[0122] In the formula, X 1 , X 2 …X n , Y 1 , Y 2 …Y n represent each medium-voltage flexible interconnection device, P i represents the position where each device is located, P best represents the optimal solution;

[0123]

[0124] In the formula, η represents the efficiency of the device, P c is the rated power of the device, T represents the number of years of the project work, n c (t) represents the number of cycles in the t-th year, r represents the discount rate, M(t) represents the operation and maintenance cost in the t-th year, C E represents the storage cost;

[0125] After the position distribution of the medium-voltage flexible interconnection device is confirmed, record the medium-voltage flexible device as an obstacle and place it in the two-dimensional environment. Taking the lowest cost of the low-voltage flexible interconnection device and the total power cost as the objectives, obtain the installation position and capacity of the optimal low-voltage flexible interconnection device:

[0126] Y min = Y FIDL + Y ELC

[0127] In the formula, Y min represents the minimum total cost, Y fidl represents the annual cost of equipment operation, YELC Represents the best installation position of the device;

[0128]

[0129] Where a 1 、a 2 …a n ,b 1 、b 2 …b n represent each low-voltage flexible interconnection device, and P best1 represents the optimal solution;

[0130]

[0131] The constraint conditions for the medium-voltage flexible interconnection device to access the distribution network are

[0132]

[0133] Among them, P l (t) is the maximum power that can be transmitted in the circuit;

[0134] The constraint conditions for the low-voltage flexible device to access the distribution network are:

[0135]

[0136] Where K is the maintenance coefficient of the renewable power generation unit;

[0137] The four layers of the pre-established optimized four-layer model of the device configuration module 12 include: the communication layer, the command and decision-making layer, the real-time management layer, and the local device layer,

[0138] The four-layer model is optimized with the goal of minimizing the annual cost and optimizing the planning and configuration of medium- and low-voltage flexible interconnection devices to obtain an optimized four-layer model;

[0139] The calculation process of using the multi-objective cuckoo search algorithm by the device configuration module 12 to obtain the coordinated control optimization result of medium- and low-voltage flexible interconnection devices:

[0140] Randomly generate an initial population, including a certain number of solutions and optimal solutions of medium- and low-voltage flexible interconnection devices; then update the position iteratively according to the formulas of X vld and Y ELC , and then determine the fitness of each time through the results of X min and Y min . When the obtained result is the lowest compared with the previous five times and the next five times, the termination condition is satisfied, and the obtained result is the optimal solution.

[0141] Based on the same inventive concept, the present invention further provides a computer device, which includes: one or more processors, and a memory for storing one or more computer programs; the program includes program instructions, and the processor is configured to execute the program instructions stored in the memory. The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is used to implement one or more instructions. Specifically, it is used to load and execute one or more instructions in the computer storage medium to implement the above method.

[0142] It should be further noted that, based on the same inventive concept, the present invention further provides a computer storage medium, on which a computer program is stored, and the computer program, when run by a processor, executes the above method. The storage medium may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may, for example, but is not limited to, an electrical, magnetic, optical, electrical, magnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the computer-readable storage medium include: an electrical connection having one or more wires, a portable computer disk, a hard disk, a Random Access Memory (RAM), a Read-Only Memory (ROM), an Erasable Programmable Read-Only Memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, the computer-readable storage medium may be any tangible medium that contains or stores a program, and the program may be used by or combined with an instruction execution system, apparatus, or device.

[0143] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0144] The foregoing has shown and described the basic principles, main features and advantages of the present disclosure. Those skilled in the art should understand that the present disclosure is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present disclosure. Without departing from the spirit and scope of the present disclosure, the present disclosure will have various changes and improvements, and these changes and improvements fall within the scope of the present disclosure claimed.

Claims

1. A hierarchical coordinated control optimization method for medium and low voltage flexible interconnected distribution systems, characterized in that: The method comprises the following steps: Receive power-related data, use the power-related data to calculate the power supply quality, and determine the upper limit of the access of medium and low voltage flexible interconnection devices based on the power supply quality; Based on the upper limit of the access of medium and low voltage flexible interconnected devices, the relevant operating data of the medium voltage flexible interconnected devices are obtained, and the relevant operating data of the medium voltage flexible interconnected devices are input into the pre-established four-layer optimization model. The multi-objective rime algorithm is used to solve it, and the coordinated control optimization results of the medium and low voltage flexible interconnected devices are obtained.

2. The hierarchical coordinated control optimization method for medium and low voltage flexible interconnected power distribution system according to claim 1 is characterized in that: The calculation process of using the power related data to calculate the power supply quality is as follows: Where η is the wire circuit efficiency, P b (t) is the total power that the circuit can carry, P pv (t) is the electricity provided by renewable energy, P WT (t) is the electricity provided by non-renewable energy, P l (t) is the total energy demand.

3. The hierarchical coordinated control optimization method for medium and low voltage flexible interconnected power distribution systems according to claim 1 is characterized in that: The working environment of the medium and low voltage flexible interconnection equipment becomes a two-dimensional environment.

4. The hierarchical coordinated control optimization method for medium and low voltage flexible interconnected power distribution system according to claim 3 is characterized in that: With the goal of minimizing the annual operating cost of medium-voltage flexible interconnection equipment and the annual variance of medium-voltage transformer load rate, the installation location of medium-voltage flexible interconnection and the installation capacity of low-voltage VSC are planned: X min =X FIDL +X ELC Among them, X min represents the minimum total cost, X fidl represents the annual cost of equipment operation, X vld Represents the starting position; In the formula, X1, X2…X n ,Y1,Y2…Y n Represents each medium voltage flexible interconnection device, P i Represents the location of each device, P best represents the best solution; In the formula, η represents the efficiency of the equipment, P c is the rated power of the equipment, T represents the year of project operation, n c (t) represents the number of cycles in year t, r represents the discount rate, M(t) represents the operation and maintenance cost in year t, C E Represents the storage cost.

5. The hierarchical coordinated control optimization method for medium and low voltage flexible interconnected power distribution system according to claim 4 is characterized in that: After the location distribution of the medium-voltage flexible interconnection equipment is confirmed, the medium-voltage flexible equipment is recorded as an obstacle and placed in a two-dimensional environment. The lowest cost of the low-voltage flexible interconnection equipment and the total power cost are taken as the goal to obtain the optimal installation location and capacity of the low-voltage flexible interconnection device: AND min =And FIDL +Y ELC Where Y min represents the minimum total cost, Y fidl Represents the annual cost of equipment operation, Y ELC Represents the best installation location for the equipment; In the formula, a1, a2…a n ,b1,b2…b n Represents each low voltage flexible interconnect device, P best1 represents the best solution; 6. The hierarchical coordinated control optimization method for medium and low voltage flexible interconnected power distribution system according to claim 5 is characterized in that: The constraints for the medium voltage flexible interconnection equipment to access the distribution network are: Among them, P l (t) is the maximum transmittable power in the circuit; The constraints for low-voltage flexible equipment to access the distribution network are: Where K is the maintenance factor of the renewable power generation unit.

7. The hierarchical coordinated control optimization method for medium and low voltage flexible interconnected power distribution systems according to claim 1 is characterized in that: The four layers of the pre-established optimized four-layer model include: communication layer, command decision layer, real-time management layer and local device layer. The four-layer model is optimized with the goal of minimizing annual cost and optimizing the planning and configuration of medium and low voltage flexible interconnection equipment to obtain an optimized four-layer model.

8. The hierarchical coordinated control optimization method for medium and low voltage flexible interconnected power distribution systems according to claim 1 is characterized in that: The calculation process of using the multi-objective rime algorithm to solve and obtain the coordinated control optimization results of medium and low voltage flexible interconnected devices: The initial population is randomly generated, including a certain number of medium and low voltage flexible interconnection equipment solutions and optimal solutions; then according to X vld and Y ELC The formula is used to iteratively update the position, and then X min and Y min The result determines the fitness of each time. When the obtained result is the lowest compared with the previous five times and the last five times, the termination condition is met and the result is the optimal solution.

9. A hierarchical coordination control optimization device for medium and low voltage flexible interconnected power distribution systems, characterized in that: include: A power supply calculation module is used to receive power-related data, calculate the power supply quality using the power-related data, and determine the upper limit of the access of medium and low voltage flexible interconnection devices based on the power supply quality; The equipment configuration module is used to obtain the relevant operating data of the medium-voltage flexible interconnection equipment based on the upper limit of the access of the medium- and low-voltage flexible interconnection equipment, input the relevant operating data of the medium-voltage flexible interconnection equipment into the pre-established four-layer optimization model, and use the multi-objective rime algorithm to solve it, so as to obtain the coordinated control optimization results of the medium- and low-voltage flexible interconnection equipment.

10. The hierarchical coordination control optimization device for medium and low voltage flexible interconnected power distribution systems according to claim 9 is characterized in that: The power supply calculation module uses the power related data to calculate the power supply quality calculation process: Where η is the wire circuit efficiency, P b (t) is the total power that the circuit can carry, P pv (t) is the electricity provided by renewable energy, P WT (t) is the electricity provided by non-renewable energy, P l (t) is the total energy demand; The working environment of the medium and low voltage flexible interconnection equipment of the equipment configuration module becomes a two-dimensional environment. With the goal of minimizing the annual operating cost of medium-voltage flexible interconnection equipment and the annual variance of medium-voltage transformer load rate, the installation location of medium-voltage flexible interconnection and the installation capacity of low-voltage VSC are planned: X min =X FIDL +X ELC Among them, X min represents the minimum total cost, X fidl represents the annual cost of equipment operation, X vld Represents the starting position; In the formula, X1, X2…X n ,Y1,Y2…Y n Represents each medium voltage flexible interconnection device, P i Represents the location of each device, P best represents the best solution; In the formula, η represents the efficiency of the equipment, P c is the rated power of the equipment, T represents the year of project operation, n c (t) represents the number of cycles in year t, r represents the discount rate, M(t) represents the operation and maintenance cost in year t, C E represents the storage cost; After the location distribution of the medium-voltage flexible interconnection equipment is confirmed, the medium-voltage flexible equipment is recorded as an obstacle and placed in a two-dimensional environment. The lowest cost of the low-voltage flexible interconnection equipment and the total power cost are taken as the goal to obtain the optimal installation location and capacity of the low-voltage flexible interconnection device: AND min =And FIDL +Y ELC Where Y min represents the minimum total cost, Y fidl Represents the annual cost of equipment operation, Y ELC Represents the best installation location for the equipment; In the formula, a1, a2…a n ,b1,b2…b n Represents each low voltage flexible interconnect device, P best1 represents the best solution; The constraints for the medium voltage flexible interconnection equipment to access the distribution network are: Among them, P l (t) is the maximum transmittable power in the circuit; The constraints for low-voltage flexible equipment to access the distribution network are: Where K is the maintenance factor of the renewable power generation unit; The four layers of the pre-established optimized four-layer model of the device configuration module include: communication layer, command decision layer, real-time management layer and local device layer. The four-layer model is optimized with the goal of minimizing annual cost and optimizing the planning and configuration of medium and low voltage flexible interconnection equipment to obtain an optimized four-layer model. The equipment configuration module uses the multi-objective rime algorithm to solve and obtain the calculation process of the coordinated control optimization results of medium and low voltage flexible interconnected equipment: The initial population is randomly generated, including a certain number of medium and low voltage flexible interconnection equipment solutions and optimal solutions; then according to X vld and Y ELC The formula is used to iteratively update the position, and then X min and Y min The result determines the fitness of each time. When the obtained result is the lowest compared with the previous five times and the last five times, the termination condition is met and the result is the optimal solution.

11. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that: The memory stores a computer program that can be run on the processor. When the processor loads and executes the computer program, the hierarchical coordinated control optimization method for a medium and low voltage flexible interconnected distribution system according to any one of claims 1 to 8 is adopted.

12. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, characterized in that: When the computer program is loaded and executed by the processor, the hierarchical coordinated control optimization method for medium and low voltage flexible interconnected distribution systems described in any one of claims 1 to 8 is adopted.

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