Control method for incremental power distribution network

Abstract

The invention relates to a control method for an incremental power distribution network, and the method comprises the following steps: S1, collecting the position information, capacity information and power grid access modes of new energy stations and energy storage facilities, the new energy stations comprising a photovoltaic station and a wind energy station, and collecting the local electricity price, electricity load and new energy subsidy policies; s2, formulating an energy storage configuration scheme according to the collected electrical load; s3, establishing an incremental power distribution network control platform, and connecting the new energy station and the energy storage facility to the incremental power distribution network control platform; s4, combining the position information, the capacity information, the power grid access mode, the local electricity price, the electrical load and the new energy subsidy policy to make an operation strategy; wherein the control platform performs control according to an operation strategy, and the control process of the operation strategy is that peak clipping of a power grid is realized by combining a power utilization scene according to the fluctuation of the power generation capacity of the photovoltaic station and the wind energy station. The operation strategy provided by the invention can better realize peak clipping of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of incremental distribution networks, and in particular to a control method for incremental distribution networks. Background Art

[0002] The output of renewable energy sources such as wind power and photovoltaic power generation is random and intermittent. The large-scale integration of such energy sources affects the reliable operation of the power grid. Energy storage systems can flexibly adjust the balance between power generation and consumption in the power system, providing support for the stability of the power system. Early research on power-side energy storage was aimed at improving the power generation characteristics of new energy sites, playing a role in reducing output fluctuations, tracking power generation plans, reducing power forecast errors, and reducing wind and solar power curtailment. As the overall proportion of renewable energy power generation in the power system increases, renewable energy is also required to assume the responsibility of maintaining the safe, stable, and economic operation of the power system. Various regions have also issued policies requiring new energy sites to be equipped with a certain proportion of energy storage facilities. While improving the performance of individual new energy sites and increasing the absorption rate, it can also increase system flexibility.

[0003] my country's energy storage market has enormous potential for development, but due to factors such as high investment costs, its development has not met expectations. Reasonable capacity configuration of energy storage systems is a prerequisite for its widespread application. Optimizing the configuration of energy storage capacity and its post-operation scheduling helps unlock its full value, improves the economic efficiency of investment and operation, and is crucial for maximizing the potential of energy storage applications.

[0004] With the deepening of power system reform, the liberalization of incremental distribution network investment has moved from top-level design to the implementation phase, and the form and operation of incremental distribution networks are undergoing significant changes. Unlike traditional centralized distribution networks, decentralized wind power and distributed photovoltaic power generation replace the traditional centralized power supply model. This is a key feature of incremental distribution networks. Energy storage is required to balance the fluctuations in wind and solar power output and ensure the reliable operation of incremental distribution networks. However, the investment cost per unit of renewable energy sources is high, the output is relatively random, and the electricity demand of incremental distribution networks is generally low. If investment planning is not rational, not only will the advantages of incremental distribution networks be underutilized, but excessive investment may also lead to losses or negative impacts on the power grid. In this context, it is crucial to rationally plan the capacity configuration and operation strategy of energy storage, wind, and solar power sources.

[0005] Patent publication number CN114884099A discloses a method for controlling an energy storage system. The method includes: setting a capacity cost management strategy with descending priority, a peak-shaving and valley-filling strategy, and a user time-of-use electricity price management strategy; determining in real time the relationship between the current user load, the substation capacity, and the photovoltaic power generation, and selecting the strategy to be executed based on the priority order; and controlling the operating status of the energy storage system based on the determination of whether the energy storage system's current power generation is generating economic benefits and / or the current capacity of the energy storage system. This patent fails to rationally aggregate and plan resources, help incremental distribution network builders effectively avoid the risk of losses, and fails to effectively prevent power fluctuations.

[0006] Therefore, it is an urgent problem to provide a control method for incremental distribution networks that can reasonably utilize electric energy and avoid power fluctuations. Summary of the Invention

[0007] The purpose of the present invention is to provide a control method for an incremental distribution network in order to overcome the defects of the above-mentioned prior art.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] According to one aspect of the present invention, a control method for an incremental distribution network is provided, the control method comprising the following process:

[0010] S1. Collecting location information, capacity information, and grid access methods of new energy stations and energy storage facilities. The new energy stations include photovoltaic stations and wind power stations, as well as local electricity prices, electricity load, and new energy subsidy policies.

[0011] S2. Develop an energy storage configuration plan based on the collected electricity load;

[0012] S3. Establish an incremental distribution network control platform and connect new energy stations and energy storage facilities to the incremental distribution network control platform;

[0013] S4. Formulate an operation strategy based on location information, capacity information, grid access method, local electricity price, electricity load, and new energy subsidy policy;

[0014] The control platform is controlled according to an operation strategy, and the control process of the operation strategy is to realize peak shaving of the power grid according to the fluctuation of the power generation capacity of photovoltaic stations and wind power stations in combination with the power consumption scenario.

[0015] As a preferred technical solution, the grid access method includes collecting the communication interfaces and communication protocols of new energy stations and energy storage facilities, and determining the grid access method through the communication interfaces and communication protocols.

[0016] As a preferred technical solution, the formulation of the energy storage configuration plan includes the following process:

[0017] S21. Divide the users of the incremental distribution network into different user needs;

[0018] S22. Develop different energy storage configuration plans based on electricity load and different user needs;

[0019] Among them, energy storage configuration plans are divided into centralized energy storage, industrial and commercial user energy storage, and household energy storage.

[0020] As a preferred technical solution, the connection between the new energy station and the energy storage facility includes the following process:

[0021] S31. The control platform establishes communication relationships with the operation and maintenance units of new energy stations and energy storage facilities;

[0022] S32. Based on the energy storage configuration plan, the control platform handles access procedures for the new energy station and energy storage facilities;

[0023] S33, new energy stations and energy storage facilities are centrally dispatched and taken over by the control platform.

[0024] As a preferred technical solution, the formulation of the operation strategy includes the following process:

[0025] S41. Divide electricity consumption time into off-peak, normal, and peak periods based on location information, capacity information, grid access method, local electricity price, electricity load, and new energy subsidy policies;

[0026] S42. Determine the charging or discharging time period of the incremental distribution network and formulate an operation strategy.

[0027] As a preferred technical solution, the operation strategy includes a peak shaving operation strategy, which includes the following process:

[0028] S401. Photovoltaic power generation gives priority to powering industrial parks;

[0029] S402: If the initial net load of the industrial park's power distribution system exceeds the annual peak load limit, the power grid company will use battery energy storage to discharge and reduce the peak load.

[0030] S403, the battery energy storage is discharged in proportion to the maximum discharge power of the energy storage, and peak shaving is performed;

[0031] S404. If the corrected net load of the industrial park's power distribution system is still greater than the annual peak load limit, the power grid company may call for interrupted load peak reduction.

[0032] S405. Under the condition that the annual interrupted power consumption of the power users participating in the interruptible load project does not exceed the annual interrupted power consumption limit, the power users shall reduce the load peak in proportion to the proportion of the maximum load reduction;

[0033] S406. In the next period, execute the energy storage peak shaving operation strategy.

[0034] As an optimal technical solution, if the initial net load of the industrial park power distribution system in S402 is not greater than the annual peak load limit, and the energy storage charge state is not 1, the battery energy storage is fully charged while ensuring that the value of the industrial park power distribution system load minus photovoltaic power generation and energy storage output power is not greater than the annual peak load limit.

[0035] As a preferred technical solution, if the initial net load of the industrial park power distribution system in S402 is not greater than the annual peak load limit, and the energy storage charge state is 1, the energy storage peak shaving operation strategy is executed in the next period.

[0036] As an optimal technical solution, if the corrected net load of the industrial park power distribution system in S404 is still not greater than the annual peak load limit, the power grid company will call for interruptible load peak shaving, and then execute the energy storage peak shaving operation strategy in the next period.

[0037] As a preferred technical solution, the battery energy storage determines the charging and discharging power according to the load of the industrial park's power distribution system and the annual peak load limit.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. The operation strategy of the present invention comprehensively considers the power generation and power consumption scenarios of new energy, combines the different working conditions of electricity users, and adopts different control strategies to better achieve peak shaving of the power grid.

[0040] 2. The peak-shaving operation strategy of the present invention adopts photovoltaic power generation, battery energy storage and interruptible load to jointly cut the peak, ensuring economy and feasibility.

[0041] 3. The present invention improves the power quality of power systems with a high proportion of renewable energy generation by formulating an operating strategy that meets the needs of all parties, and can effectively alleviate power fluctuations.

[0042] 4. The present invention collects relevant data of new energy stations and energy storage facilities and uses reasonable resource aggregation to help build incremental distribution networks. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the overall process of the present invention;

[0044] Figure 2 Detailed flow chart of the present invention;

[0045] Figure 3 This is a flow chart of the peak shaving operation strategy of the present invention. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0047] The output of renewable energy sources such as wind power and photovoltaic power generation is random and intermittent. The large-scale integration of such energy sources affects the reliable operation of the power grid. Energy storage systems can flexibly adjust the balance between power generation and consumption in the power system, providing support for the stability of the power system. Early research on power-side energy storage was aimed at improving the power generation characteristics of new energy sites, playing a role in reducing output fluctuations, tracking power generation plans, reducing power forecast errors, and reducing wind and solar power curtailment. As the overall proportion of renewable energy power generation in the power system increases, renewable energy is also required to assume the responsibility of maintaining the safe, stable, and economic operation of the power system. Various regions have also issued policies requiring new energy sites to be equipped with a certain proportion of energy storage facilities. While improving the performance of individual new energy sites and increasing the absorption rate, it can also increase system flexibility.

[0048] my country's energy storage market has enormous potential for development, but due to factors such as high investment costs, its development has not met expectations. Reasonable capacity configuration of energy storage systems is a prerequisite for its widespread application. Optimizing the configuration of energy storage capacity and its post-operation scheduling helps unlock its full value, improves the economic efficiency of investment and operation, and is crucial for maximizing the potential of energy storage applications.

[0049] With the continuous deepening of power system reform, the liberalization of incremental distribution network investment has moved from top-level design to the implementation stage, and the form and operation of incremental distribution networks are undergoing significant changes. Unlike traditional centralized distribution networks, decentralized wind power and distributed photovoltaic power generation replace the traditional centralized power supply model. This is a key feature of incremental distribution networks. Energy storage is required to balance the fluctuations in wind and solar power output and ensure the reliable operation of incremental distribution networks. However, the investment cost per unit of renewable energy sources is high, the output is relatively random, and the electricity demand of incremental distribution networks is generally low. If investment planning is not rational, not only will the advantages of incremental distribution networks be underutilized, but excessive investment may also lead to losses or negative impacts on the power grid. In this context, rational planning of energy storage, wind and solar power generation capacity configuration, and operation strategies is of great significance. Existing technologies fail to rationally aggregate and plan resources to help incremental distribution network builders effectively avoid the risk of losses and effectively prevent power fluctuations. Therefore, providing a method for incremental distribution networks that can rationally plan and prevent power fluctuations is an urgent problem.

[0050] The inventive concept of this invention is as follows: First, by integrating the renewable energy stations surrounding the incremental distribution network into the incremental distribution system, resources are aggregated and dispatched in a unified manner. Second, during the energy storage configuration phase, energy storage operation strategies are fully considered to improve overall resource utilization and economic efficiency within the incremental distribution network.

[0051] Therefore, the present invention provides a control method for incremental distribution networks; the operating strategy of the present invention comprehensively considers the power generation and power consumption scenarios of various new energy sources, and adopts different control strategies in combination with the different working conditions of electricity users to better achieve peak shaving of the power grid; the peak shaving operation strategy of the present invention adopts photovoltaic power generation, battery energy storage and interruptible loads to jointly shave peaks, ensuring economy and feasibility; the present invention improves the power quality of power systems with a relatively high proportion of renewable energy power generation by formulating operating strategies that meet the needs of all parties, and can effectively alleviate power fluctuations; the present invention collects relevant data on new energy sites and energy storage facilities, and uses reasonable resource aggregation to help build incremental distribution networks.

[0052] Example 1

[0053] like Figure 1 As shown, a control method for an incremental distribution network includes the following steps:

[0054] S1. Collecting location information, capacity information, and grid access methods of new energy stations and energy storage facilities. The new energy stations include photovoltaic stations and wind power stations, as well as local electricity prices, electricity load, and new energy subsidy policies.

[0055] S2. Develop an energy storage configuration plan based on the collected electricity load;

[0056] S3. Establish an incremental distribution network control platform and connect new energy stations and energy storage facilities to the incremental distribution network control platform;

[0057] S4. Formulate an operation strategy based on location information, capacity information, grid access method, local electricity price, electricity load, and new energy subsidy policy;

[0058] The control platform is controlled according to an operation strategy, and the control process of the operation strategy is to realize peak shaving of the power grid according to the fluctuation of the power generation capacity of photovoltaic stations and wind power stations in combination with the power consumption scenario.

[0059] like Figure 2 As shown, the grid access method includes collecting the communication interfaces and communication protocols of the new energy stations and energy storage facilities, and determining the grid access method through the communication interfaces and communication protocols.

[0060] The formulation of the energy storage configuration plan includes the following processes:

[0061] S21. Divide the users of the incremental distribution network into different user needs;

[0062] S22. Develop different energy storage configuration plans based on electricity load and different user needs;

[0063] Among them, energy storage configuration plans are divided into centralized energy storage, industrial and commercial user energy storage, and household energy storage.

[0064] The access to new energy stations and energy storage facilities includes the following processes:

[0065] S31. The control platform establishes communication relationships with the operation and maintenance units of new energy stations and energy storage facilities;

[0066] S32. Based on the energy storage configuration plan, the control platform handles access procedures for the new energy station and energy storage facilities;

[0067] S33, new energy stations and energy storage facilities are centrally dispatched and taken over by the control platform.

[0068] The formulation of the operation strategy includes the following process:

[0069] S41. Divide electricity consumption time into off-peak, normal, and peak periods based on location information, capacity information, grid access method, local electricity price, electricity load, and new energy subsidy policies;

[0070] S42. Determine the charging or discharging time period of the incremental distribution network and formulate an operation strategy.

[0071] In this embodiment, information about the surrounding conditions of the incremental distribution network is collected. Specifically, first, information about the surrounding new energy sites is collected, including the capacity, location, and grid access method of each centralized / distributed photovoltaic site and wind farm, to facilitate the subsequent formulation of a plan for accessing the incremental distribution network; it is necessary to focus on collecting information such as the brand of the photovoltaic power station, the site construction party and its contact person, communication interface, protocol, etc., on the one hand, to prepare for access to the unified dispatching platform of the incremental distribution network; on the other hand, in the process of formulating the system control strategy, various parameters of the photovoltaic array need to be included in the calculation, such as the rated power of the photovoltaic array, the operating parameters under specific conditions (such as specific sunlight irradiance, photovoltaic cell surface temperature), etc., and subsequently, the power generation intensity of the photovoltaic site needs to be calculated in real time based on these parameters so that a comprehensive control strategy can be formulated in combination with other parameters. Second, collect load information from surrounding electricity users, including industrial parks, individual businesses, and residential users, as well as their needs and suggestions for the incremental distribution network and current power supply conditions. Work with willing users to access the network and obtain electricity consumption data from the local power supply bureau to identify each user's electricity usage habits, peak usage periods, transformer capacity, and other information. Leveraging data analytics, build user profiles to gain a deeper understanding of each user's electricity usage habits and needs, enabling personalized service provision. For large industrial parks, special attention should be paid to their monthly and quarterly average loads, annual peak loads, and the initial net load of the distribution system (the industrial park's distribution system load minus the photovoltaic power output) to facilitate the subsequent determination of energy storage capacity and the development of energy storage operation strategies. Third, gather information on relevant new energy policies in the location of the incremental distribution network, including peak and off-peak electricity price periods, local new energy subsidy policies, and whether surplus new energy generation within the incremental distribution network is permitted to be connected to the grid. Based on local policies, implement demand response mechanisms to encourage users to adjust their electricity usage based on grid load, achieving dynamic pricing and load balancing. This will facilitate the development of energy storage operation strategies that maximize overall system economics and provide a foundation for economic calculations.

[0072] Develop an energy storage configuration plan. Generally speaking, there are three types of energy storage that need to be built or connected to the incremental distribution network: large-scale centralized energy storage, industrial and commercial user-side energy storage within the factory, and household energy storage. Large industrial parks can use energy storage systems to reduce the electricity bills of electricity users within the park. Based on the park's load curve, the battery energy storage system's remaining capacity ratio and unit capacity revenue are considered to configure a reasonable battery energy storage system power and capacity for the park. Based on the operating conditions of the battery energy storage system in the application scenario, new or existing centralized energy storage and distributed energy storage systems can be connected to the incremental distribution network to generate a better return on investment, while also alleviating the peak-shaving pressure on the power grid during the park's peak electricity consumption period.

[0073] Taking into account the surrounding electricity load conditions, energy storage configuration strategies are specified for different user groups based on user needs. For example, centralized energy storage is configured near large industrial areas, and user-side energy storage is configured for individual industrial and commercial enterprises and residential communities. The energy storage configuration capacity and access method are determined based on factors such as load curves and transformer margins.

[0074] The configuration of industrial and commercial energy storage for individual owners is significantly influenced by the capacity of their existing transformers. The installed capacity of grid-connected energy storage on the low-voltage side of the user's transformer should be determined based on the transformer's spare capacity during periods of low electricity prices. After installation, the energy storage system should be able to achieve a peak-to-valley ratio within the internal load of at least 1:1. The increased energy storage charging capacity should meet the current-carrying capacity requirements of busbars, switches, and other equipment, and should not require the modification or construction of external power supply lines or substations.

[0075] The configuration of household energy storage should be combined with the construction of surrounding household photovoltaic systems, with the aim of further reducing residents' energy costs and creating more economic benefits while ensuring residents' daily electricity use.

[0076] Establish a comprehensive platform that allows users to share and access usage data for photovoltaic and energy storage equipment, promoting information transparency and experience sharing. Integrate photovoltaic power generation, energy storage equipment, and electricity consumption into an intelligent monitoring system to collect and analyze data in real time. Connect new energy sites and energy storage facilities to the incremental distribution network control platform for unified scheduling. After collecting information on surrounding new energy sites (including real-time status and performance data on substations, distribution networks, photovoltaic power generation, energy storage equipment, and power users), first compile a list of new energy sites that are planned or intended to be connected to the incremental distribution network. Also connect existing energy storage sites to systematically plan the energy supply and demand layout of the incremental distribution network. After identifying the planned sites, connect the hardware and software interfaces with the site personnel. In terms of hardware, connect the new energy sites and energy storage facilities to the incremental distribution network for unified scheduling. In terms of software, establish data interfaces between the sites and the distribution network control platform, and establish communication protocols and standards between devices to ensure information interoperability and compatibility. Based on the structure and layout of the power network, the distribution network will enable unified monitoring of the operating data of each facility. Specifically, after investigating the surrounding new energy stations, the builders or operators of the incremental distribution network will contact the station's operations and maintenance unit to complete procedures for connecting the station to the incremental distribution network. At the same time, electricity users and energy storage facilities will also be connected to the distribution network for unified management and control.

[0077] Develop an energy storage facility operation strategy. Based on factors such as electricity prices, local policies, installed capacity of new energy stations, and factory or residential electricity consumption, combined with load conditions in different time periods, a comprehensive energy storage equipment charging and discharging strategy should be developed, including charging and discharging time periods and scheduling methods (determining which portion of electricity is prioritized by the load), allowing for flexible adjustments based on different load conditions.

[0078] A comprehensive energy storage operation strategy is developed based on local electricity prices, installed capacity of new energy stations, energy storage configuration capacity, and the ratio of photovoltaic power generation to load electricity consumption. Taking the peak and valley electricity price period in a certain province as an example, 00:00-8:00 is the valley period, 8:00-10:00, 13:00-17:00, and 22:00-0:00 are the normal periods, and 10:00-13:00 and 17:00-22:00 are the peak periods. The plan is shown in Table 1:

[0079] Table 1

[0080]

[0081]

[0082] like Figure 3 As shown, the operation strategy includes a peak shaving operation strategy, which includes the following processes:

[0083] S401. Photovoltaic power generation gives priority to powering industrial parks;

[0084] S402: If the initial net load of the industrial park's power distribution system exceeds the annual peak load limit, the power grid company will use battery energy storage to discharge and reduce the peak load.

[0085] S403, the battery energy storage is discharged in proportion to the maximum discharge power of the energy storage, and peak shaving is performed;

[0086] S404. If the corrected net load of the industrial park's power distribution system is still greater than the annual peak load limit, the power grid company may call for interrupted load peak reduction.

[0087] S405. Under the condition that the annual interrupted power consumption of the power users participating in the interruptible load project does not exceed the annual interrupted power consumption limit, the power users shall reduce the load peak in proportion to the proportion of the maximum load reduction;

[0088] S406. In the next period, execute the energy storage peak shaving operation strategy.

[0089] If the initial net load of the industrial park power distribution system in S402 is not greater than the annual peak load limit, and the energy storage charge state is not 1, the battery energy storage is fully charged while ensuring that the value of the industrial park power distribution system load minus the photovoltaic power generation and energy storage output power is not greater than the annual peak load limit.

[0090] If the initial net load of the industrial park power distribution system in S402 is not greater than the annual peak load limit, and the energy storage charge state is 1, the energy storage peak shaving operation strategy will be implemented in the next period.

[0091] If the corrected net load of the industrial park's power distribution system in S404 is still not greater than the annual peak load limit, the power grid company will call for interruptible load peak shaving, and in the next period, the energy storage peak shaving operation strategy will be implemented.

[0092] The battery energy storage determines the charging and discharging power according to the load of the industrial park's power distribution system and the annual peak load limit.

[0093] This example focuses on the industrial park distribution network invested, constructed, and operated by a power grid company. The article explores the economics and feasibility of using photovoltaic power generation, battery energy storage, and interruptible loads to jointly shave peak loads. Considering that time-of-use electricity prices are currently only implemented for electricity users in my country, the battery energy storage will determine its charge and discharge power based on the load of the industrial park's power distribution system and the annual peak load limit.

[0094] Taking the tth period on the dth day as an example, considering the load characteristics of the industrial park's power distribution system and the operating characteristics of distributed power sources and demand response, the peak shaving operation strategy is as follows:

[0095] Step 401: Photovoltaic power generation is used to power the park first, and the output power is shown in Formula 1:

[0096]

[0097] Where P pv,d (t) is the photovoltaic power output power at the working point, the operating parameters under standard rated conditions, specifically the solar radiation intensity I stc is 1kW / m2, the surface temperature of the photovoltaic array is J stc At 25℃, P stc is the photovoltaic power output power under standard rated conditions, k is the power temperature coefficient, I d (t) and J d (t) are the solar radiation intensity at the working point and the surface temperature of the photovoltaic array, respectively.

[0098] Step 402: If the initial net load of the industrial park's power distribution system (the industrial park's power distribution system load minus the photovoltaic power generation output power) exceeds the annual peak load limit, the power grid company invokes battery energy storage to discharge and shave the peak. Step 403 then proceeds: The battery energy storage discharges and shaves the peak in proportion to the maximum discharge power of the energy storage, minimizing the initial net load of the industrial park's power distribution system to the annual peak load limit, as shown in Equations 2 and 3:

[0099]

[0100] Among them, P ba,i,d (t) is the battery energy storage output power, positive value represents discharge, negative value represents charge, P is the maximum discharge power of the battery energy storage, which is affected by factors such as the energy storage rated power and the minimum allowable state of charge;ld,d (t) Supplying power system load to industrial parks; is the annual peak load limit; N ba The number of nodes to be selected for battery energy storage; They are the rated power and capacity of battery energy storage; SOC ba,i,d (t-1) is the battery energy storage charge state; ε ba,i 、 are the minimum allowable state of charge, self-discharge rate and discharge efficiency of the battery energy storage respectively; Δt is the time interval within the day, and then step 404 is executed.

[0101] If the initial net load of the industrial park's power distribution system is not greater than the annual peak load limit, and the energy storage charge state is not 1, the energy storage should be fully charged as soon as possible, while ensuring that the value of the industrial park's power distribution system load minus the photovoltaic power generation and energy storage output power is not greater than the annual peak load limit. This is shown in Equations 4 and 5:

[0102]

[0103] In the formula The maximum charging power of the energy storage system is affected by factors such as the rated power of the energy storage system and the maximum allowable state of charge. are the maximum state of charge allowed by energy storage and the charging efficiency, respectively. Otherwise, execute step 406.

[0104] Step 404: If the corrected net load of the industrial park's power distribution and utilization system is still greater than the annual peak load limit, the grid company invokes interruptible load peak shaving, and then executes step 405. If the corrected net load of the industrial park's power distribution and utilization system is still less than the annual peak load limit, the grid company invokes interruptible load peak shaving, and then executes step 406: Execute the energy storage peak shaving operation strategy for the next period.

[0105] Step 405: Under the condition that the annual interrupted power consumption of the power users participating in the interruptible load project does not exceed the annual interrupted power consumption limit, the power users reduce the load peak in proportion to the maximum load reduction, as shown in Formula 6-8:

[0106]

[0107] Where P il,j,d (t), are user load reduction, maximum load reduction and load, respectively. Subject to the load limit of power users and the annual power outage of power users; N il The number of power users participating in the interruptible load project; Annual power interruption limit for electricity users; The accumulated power consumption per year is calculated for the power user. Then step 406 is executed.

[0108] Step 406: During the (t+1) period on the dth day, the energy storage peak shaving operation strategy is executed.

[0109] In summary, photovoltaic power generation is given priority to supplying power to industrial parks. If the initial net load of the industrial park's power distribution system is greater than the annual peak load limit, the power grid company will give priority to calling on battery energy storage to discharge and shave the peak, and finally call on interruptible load to shave the peak.

[0110] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A control method for an incremental distribution network, characterized in that: The control method The process includes: S1. Collect the location information, capacity information and grid access methods of new energy stations and energy storage facilities. The new energy stations include photovoltaic stations and wind power stations, and collect local electricity prices, electricity loads and new energy subsidy policies; S2. Formulate energy storage configuration plan based on the collected power load; S3. Establish an incremental distribution network control platform and connect new energy stations and energy storage facilities to the incremental distribution network control platform; S4. Formulate operation strategies based on location information, capacity information, grid access method, local electricity price, electricity load and new energy subsidy policy; The control platform is controlled according to an operation strategy, and the control process of the operation strategy is to realize peak shaving of the power grid according to the fluctuation of the power generation capacity of photovoltaic stations and wind power stations in combination with the power consumption scenarios.

2. A control method for incremental distribution network according to claim 1, characterized in that: The grid access method includes collecting the communication interfaces and communication protocols of new energy stations and energy storage facilities, and determining the grid access method through the communication interfaces and communication protocols.

3. A control method for incremental distribution network according to claim 1, characterized in that: The formulation of the energy storage configuration plan includes the following processes: S21. Divide the users who use the incremental distribution network into different user needs; S22. Develop different energy storage configuration plans based on electricity load and different user needs; Among them, energy storage configuration plans are divided into centralized energy storage, industrial and commercial user energy storage, and household energy storage.

4. A control method for incremental distribution network according to claim 1, characterized in that: The access to the new energy stations and energy storage facilities includes the following processes: S31. The control platform establishes communication relationships with the operation and maintenance units of new energy stations and energy storage facilities; S32. According to the energy storage configuration plan, the control platform handles access procedures for new energy stations and energy storage facilities; S33, new energy stations and energy storage facilities are centrally dispatched and taken over by the control platform.

5. The control method for incremental distribution network according to claim 1, characterized in that: The formulation of the operation strategy includes the following processes: S41. Divide the electricity consumption time into off-peak time, normal time and peak time according to the location information, capacity information, access mode to the power grid, local electricity price, electricity load and new energy subsidy policy; S42. Determine the charging or discharging time period of the incremental distribution network and formulate an operation strategy.

6. A control method for incremental distribution network according to claim 1, characterized in that: The operation strategy includes a peak shaving operation strategy, and the peak shaving operation strategy includes the following processes: S401. Photovoltaic power generation is prioritized for powering industrial parks; S402. If the initial net load of the power distribution system in the industrial park is greater than the annual peak load limit, the power grid company will call on the battery energy storage to discharge and reduce the peak load; S403, the battery energy storage is discharged in proportion to the maximum discharge power of the energy storage to shave the peak; S404. If the corrected net load of the power distribution and utilization system of the industrial park is still greater than the annual peak load limit, the power grid company may call for interruptible load peak reduction; S405. Under the condition that the annual interruption power of the power users participating in the interruptible load project is not greater than the annual interruption power limit, the power users shall reduce the load peak in proportion to the maximum load reduction; S406. In the next period, execute the energy storage peak shaving operation strategy.

7. A control method for incremental distribution network according to claim 6, characterized in that: If the initial net load of the industrial park power distribution system in S402 is not greater than the annual peak load limit, and the energy storage charge state is not 1, the battery energy storage is fully charged while ensuring that the value of the industrial park power distribution system load minus photovoltaic power generation and energy storage output power is not greater than the annual peak load limit.

8. A control method for incremental distribution network according to claim 7, characterized in that: If the initial net load of the industrial park power distribution system in S402 is not greater than the annual peak load limit, and the energy storage charge state is 1, the energy storage peak shaving operation strategy will be implemented in the next period.

9. A control method for incremental distribution network according to claim 6, characterized in that: If the corrected net load of the industrial park power distribution system in S404 is still not greater than the annual peak load limit, the power grid company will call on the interruptible load to shave the peak, and in the next period, the energy storage peak shaving operation strategy will be implemented.

10. A control method for incremental distribution network according to claim 6, characterized in that: The battery energy storage determines the charging and discharging power according to the load of the industrial park power distribution system and the annual peak load limit.

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