Optical storage system capacity configuration method and device based on load guarantee rate

Abstract

The invention provides an optical storage system capacity configuration method and device based on a load guarantee rate, and relates to the technical field of electric energy storage. The method comprises the following steps: determining the minimum photovoltaic configuration capacity and the maximum photovoltaic configuration capacity based on the photovoltaic annual maximum utilization hours and the load annual electricity consumption of a target optical storage system configuration region; determining a photovoltaic configuration capacity calculation range and an energy storage converter power calculation range; according to the power calculation range of the energy storage converter and the maximum energy storage capacity hours, determining an energy storage capacity calculation range, and determining configuration indexes corresponding to different optical storage ratios; determining performance indexes corresponding to different optical storage ratios; and screening out candidate optical storage ratios of which the performance indexes meet preset reference indexes from different optical storage ratios, and selecting a target optical storage ratio with the minimum configuration index from the candidate optical storage ratios to perform optical storage system capacity configuration. According to the invention, on the premise that the load guarantee rate is satisfied, the optimal optical storage ratio is determined to realize reasonable configuration of the capacity of the optical storage system.

Description

Technical Field

[0001] This disclosure relates to the field of energy storage technology, and more specifically, to a method and apparatus for configuring the capacity of a photovoltaic energy storage system based on load guarantee rate. Background Technology

[0002] Driven by global energy structure transformation and the "dual-carbon" goal, the proportion of renewable energy generation, represented by photovoltaics, continues to increase. However, photovoltaic power generation is characterized by significant intermittency and volatility, with its output greatly affected by weather conditions, seasonal changes, and the diurnal cycle. This makes it difficult to meet the stable power supply needs of the power system by relying solely on photovoltaic power generation. Energy storage systems can effectively mitigate fluctuations in photovoltaic output, improve power quality, and enhance the flexibility and reliability of the power system. Therefore, photovoltaic-energy storage systems have become an important component of new energy power systems, widely used in grid-connected microgrids, off-grid power supply, and industrial and commercial energy storage scenarios.

[0003] In the planning and construction of photovoltaic-storage systems, the rational allocation of photovoltaic capacity and energy storage capacity is particularly important. If the photovoltaic capacity is configured too high, it may lead to an increase in curtailment rate and reduce energy utilization efficiency; if the energy storage capacity is insufficient, it may not be able to fully absorb photovoltaic power generation or meet load demand, affecting power supply reliability. Conversely, if the energy storage capacity is configured too high, although it can improve system reliability, it will bring about the problem of redundant configuration.

[0004] Traditional photovoltaic (PV) and energy storage (ESS) capacity configuration methods are typically based on deterministic models or simple statistical laws. For example, they select typical daily or annual PV output and load curves from historical data and determine the energy storage capacity through simulation calculations. These methods often optimize only for a single scenario or a fixed load guarantee rate, failing to reflect the differences in capacity demand under different reliability requirements. When selecting a solution, insufficient consideration is given to various load guarantee rates, often requiring numerous single simulations to obtain configuration schemes under different load guarantee rates. The results depend on the designer's experience and the number of simulations, potentially leading to configuration results that deviate from actual operational needs. Summary of the Invention

[0005] The purpose of this disclosure is to provide a photovoltaic-storage system capacity configuration method, a photovoltaic-storage system capacity configuration device, an electronic device, and a computer-readable storage medium based on load guarantee rate. By determining the photovoltaic configuration capacity calculation range, the energy storage converter power calculation range, and the energy storage capacity calculation range, configuration indicators and performance indicators of different photovoltaic-storage ratios are obtained, and the target photovoltaic-storage ratio with the smallest configuration indicator is selected for capacity configuration, thereby improving the rationality and reliability of photovoltaic-storage system capacity configuration.

[0006] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part from practice of this disclosure.

[0007] According to a first aspect of the present disclosure, a method for configuring the capacity of a photovoltaic (PV) and energy storage system based on a load guarantee rate is provided. The method includes: determining a minimum PV configuration capacity and a maximum PV configuration capacity based on the maximum annual utilization hours of PV in the target PV storage system configuration area and the annual electricity consumption of the load; determining a PV configuration capacity calculation range and an energy storage converter power calculation range based on the minimum PV configuration capacity, the maximum PV configuration capacity, and a preset PV capacity calculation step size; determining an energy storage capacity calculation range based on the energy storage converter power calculation range and the maximum energy storage capacity hours, and determining the energy storage capacity calculation range based on the PV configuration capacity calculation range, the energy storage converter power calculation range, and the preset PV capacity calculation step size. The energy storage capacity calculation range determines the configuration indicators corresponding to different photovoltaic-storage ratios; based on the annual hourly unit photovoltaic capacity output, annual hourly load power, and energy storage charge / discharge rate of the region where the photovoltaic-storage system is configured, the performance indicators corresponding to different photovoltaic-storage ratios are determined, including load guarantee rate, annual power supply of the photovoltaic-storage system, annual power curtailment of the photovoltaic-storage system, annual power curtailment rate of the photovoltaic-storage system, annual load shortage, and annual load shortage rate; candidate photovoltaic-storage ratios that meet the preset reference indicators are selected from the different photovoltaic-storage ratios, and the target photovoltaic-storage ratio with the smallest configuration indicator is selected from the candidate photovoltaic-storage ratios for photovoltaic-storage system capacity configuration.

[0008] According to a second aspect of the present disclosure, a photovoltaic-storage system capacity configuration device based on load guarantee rate is provided to implement the above-mentioned photovoltaic-storage system capacity configuration method based on load guarantee rate. The system includes: a configuration capacity determination module, used to determine a minimum photovoltaic configuration capacity and a maximum photovoltaic configuration capacity based on the maximum annual utilization hours of photovoltaic power and the annual electricity consumption of the target photovoltaic-storage system configuration area; a calculation range determination module, used to determine a photovoltaic configuration capacity calculation range and an energy storage converter power calculation range based on the minimum photovoltaic configuration capacity, the maximum photovoltaic configuration capacity, and a preset photovoltaic capacity calculation step size; and a configuration index determination module, used to determine the energy storage capacity calculation range based on the energy storage converter power calculation range and the maximum energy storage capacity hours, and based on the photovoltaic configuration capacity... The calculation range, the energy storage converter power calculation range, and the energy storage capacity calculation range determine the configuration indicators corresponding to different photovoltaic-energy storage ratios; the performance indicator determination module is used to determine the performance indicators corresponding to different photovoltaic-energy storage ratios based on the annual hourly unit photovoltaic capacity output, annual hourly load power, and energy storage charge / discharge rate of the region where the photovoltaic-energy storage system is configured. The performance indicators include load guarantee rate, annual photovoltaic-energy storage system power supply, annual photovoltaic-energy storage system curtailment, annual photovoltaic-energy storage system curtailment rate, annual load shortage, and annual load shortage rate; the capacity configuration module is used to screen out candidate photovoltaic-energy storage ratios that meet the preset reference indicators from the different photovoltaic-energy storage ratios, and select the target photovoltaic-energy storage ratio with the smallest configuration indicator from the candidate photovoltaic-energy storage ratios for photovoltaic-energy storage system capacity configuration.

[0009] According to a third aspect of the present disclosure, an electronic device is provided, comprising: a processor; and a memory storing computer-readable instructions that, when executed by the processor, implement the capacity configuration method for a photovoltaic storage system based on load guarantee rate as described in the first aspect.

[0010] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the optical storage system capacity configuration method based on load guarantee rate as described in the first aspect.

[0011] The technical solutions provided in this disclosure may have the following beneficial effects: The photovoltaic-storage system capacity configuration method based on load guarantee rate in this embodiment has several advantages. First, it determines the minimum and maximum photovoltaic configuration capacities based on the maximum annual utilization hours of photovoltaic power and the annual electricity consumption of the load, ensuring that the photovoltaic configuration capacity is limited within the load demand range and avoiding insufficient or excessive photovoltaic capacity. Second, it determines the photovoltaic configuration capacity calculation range by setting a photovoltaic capacity calculation step size between the minimum and maximum photovoltaic configuration capacities, and combines this with the energy storage converter power calculation range, enabling a mutually dependent calculation relationship between photovoltaic capacity and energy storage converter power, thus providing constraints for subsequent energy storage capacity configuration. Third, it determines the energy storage capacity calculation range by combining the maximum energy storage capacity hours within the energy storage converter power calculation range, and obtains configuration indicators corresponding to different photovoltaic-storage ratios accordingly, ensuring a correspondence between photovoltaic configuration capacity, energy storage converter power, and energy storage capacity, thereby ensuring the completeness of the photovoltaic-storage ratio selection.

[0012] Furthermore, by utilizing hourly photovoltaic capacity output per unit capacity throughout the year, hourly load power throughout the year, and energy storage charge / discharge rate, performance indicators corresponding to different photovoltaic-energy storage ratios are calculated. This allows the hourly matching relationship between photovoltaic output and load power, as well as the operational characteristics of energy storage, to be reflected, thus establishing capacity configuration based on dynamic data. In addition, by limiting the performance indicators to load guarantee rate, annual photovoltaic-energy storage system power supply, annual photovoltaic-energy storage system curtailment, annual photovoltaic-energy storage system curtailment rate, annual load shortage, and annual load shortage rate, the operational performance of the photovoltaic-energy storage ratio can be quantified from multiple dimensions, ensuring the comprehensiveness of capacity configuration. Moreover, by screening candidate photovoltaic-energy storage ratios that meet preset reference indicators from different ratios, and selecting the target ratio with the smallest configuration indicator from the candidate ratios, the final result can balance operational performance and configuration constraints, thereby ensuring the rationality and reliability of capacity configuration.

[0013] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0015] Figure 1 A flowchart illustrating a capacity configuration method for a photovoltaic-storage system based on load guarantee rate according to some embodiments of the present disclosure is shown.

[0016] Figure 2 The configuration parameters corresponding to different photovoltaic-storage ratios at a 30% load guarantee rate are shown according to embodiments of the present disclosure.

[0017] Figure 3 A schematic diagram of a system capacity configuration model according to an embodiment of the present disclosure is shown.

[0018] Figure 4 A schematic diagram of another system capacity configuration model according to an embodiment of the present disclosure is shown.

[0019] Figure 5 A schematic diagram of another system capacity configuration model according to an embodiment of the present disclosure is shown.

[0020] Figure 6 A schematic diagram of another system capacity configuration model according to an embodiment of the present disclosure is shown.

[0021] Figure 7 A schematic diagram of another system capacity configuration model according to an embodiment of the present disclosure is shown.

[0022] Figure 8 A schematic diagram of another system capacity configuration model according to an embodiment of the present disclosure is shown.

[0023] Figure 9 A schematic diagram of another system capacity configuration model according to an embodiment of the present disclosure is shown.

[0024] Figure 10 A schematic diagram of another system capacity configuration model according to an embodiment of the present disclosure is shown.

[0025] Figure 11 A flowchart illustrating another method for configuring the capacity of a photovoltaic storage system based on load guarantee rate, according to some embodiments of the present disclosure, is shown.

[0026] Figure 12 The illustration shows a schematic diagram of the composition of a capacity configuration device for a photovoltaic storage system based on a load guarantee rate, according to some embodiments of the present disclosure.

[0027] Figure 13 The schematic diagram illustrates the structural schematic of a computer system of an electronic device according to some embodiments of the present disclosure.

[0028] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this specification. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this specification as detailed in the appended claims.

[0030] The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this specification. The singular forms “a,” “the,” and “the” as used in this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0031] It should be understood that although the terms first, second, third, etc., may be used in this specification to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this specification, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0032] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art.

[0033] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., may be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0034] Furthermore, the accompanying drawings are for illustrative purposes only and are not necessarily drawn to scale. The block diagrams shown in the drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0035] In this example embodiment, a method for configuring the capacity of a photovoltaic energy storage system based on the load guarantee rate is first provided. Figure 1 The illustration schematically shows a flow chart of a photovoltaic-storage system capacity configuration method based on load guarantee rate according to some embodiments of the present disclosure. (Reference) Figure 1 As shown, the capacity configuration method for a photovoltaic-storage system based on load guarantee rate may include the following steps: Step S110: Determine the minimum and maximum photovoltaic configuration capacity based on the annual maximum utilization hours of photovoltaic power and the annual electricity consumption of the target photovoltaic-storage system configuration area.

[0036] Step S120: Determine the calculation range of photovoltaic configuration capacity and the calculation range of energy storage converter power based on the minimum photovoltaic configuration capacity, the maximum photovoltaic configuration capacity, and the preset photovoltaic capacity calculation step size.

[0037] Step S130: Determine the energy storage capacity calculation range based on the power calculation range of the energy storage converter and the maximum energy storage capacity hours, and determine the configuration indicators corresponding to different photovoltaic-storage ratios based on the photovoltaic configuration capacity calculation range, the power calculation range of the energy storage converter, and the energy storage capacity calculation range.

[0038] Step S140: Based on the annual hourly unit photovoltaic capacity output, annual hourly load power, and energy storage charge / discharge rate of the region where the photovoltaic and energy storage system is configured, determine the performance indicators corresponding to different photovoltaic and energy storage ratios. The performance indicators include load guarantee rate, annual power supply of the photovoltaic and energy storage system, annual abandoned power of the photovoltaic and energy storage system, annual abandoned power rate of the photovoltaic and energy storage system, annual load shortage power, and annual load shortage rate.

[0039] Step S150: Select candidate optical-storage ratios from different optical-storage ratios that meet the preset reference indicators, and select the target optical-storage ratio with the smallest configuration indicator from the candidate optical-storage ratios for optical-storage system capacity configuration.

[0040] According to the photovoltaic-storage system capacity configuration method based on load guarantee rate in this example embodiment, on the one hand, the minimum and maximum photovoltaic configuration capacities are determined based on the maximum annual utilization hours of photovoltaic power and the annual electricity consumption of the load, so that the photovoltaic configuration capacity can be limited within the load demand range, thereby avoiding insufficient or excessive photovoltaic capacity. On the other hand, by setting a photovoltaic capacity calculation step size between the minimum and maximum photovoltaic configuration capacities, the calculation range of photovoltaic configuration capacity is determined, and combined with the calculation range of energy storage converter power, a mutually dependent calculation relationship can be formed between photovoltaic capacity and energy storage converter power, thereby providing constraints for subsequent energy storage capacity configuration. Furthermore, by combining the maximum energy storage capacity hours within the energy storage converter power calculation range, the energy storage capacity calculation range is determined, and configuration indicators corresponding to different photovoltaic-storage ratios are obtained accordingly, so that the photovoltaic configuration capacity, energy storage converter power, and energy storage capacity can maintain correspondence, thereby ensuring the completeness of the selection of photovoltaic-storage ratio.

[0041] Furthermore, by utilizing hourly photovoltaic capacity output, hourly load power, and energy storage charge / discharge rate throughout the year, performance indicators corresponding to different photovoltaic-energy storage ratios are calculated. This allows the hourly matching relationship between photovoltaic output and load power, as well as the operational characteristics of energy storage, to be reflected, thus establishing capacity configuration based on dynamic data. In addition, by limiting performance indicators to load guarantee rate, annual photovoltaic-energy storage system power supply, annual photovoltaic-energy storage system curtailment, annual photovoltaic-energy storage system curtailment rate, annual load shortage, and annual load shortage rate, the operational performance of the photovoltaic-energy storage ratio can be quantified from multiple dimensions, ensuring the comprehensiveness of capacity configuration. Moreover, by screening candidate photovoltaic-energy storage ratios that meet preset reference indicators from different ratios, and selecting the target ratio with the smallest configuration indicator from the candidate ratios, the final result balances operational performance and configuration constraints, thereby ensuring the rationality and reliability of capacity configuration.

[0042] The following will further explain the capacity configuration method of the photovoltaic storage system based on the load guarantee rate in this example embodiment.

[0043] In step S110, the minimum photovoltaic configuration capacity and the maximum photovoltaic configuration capacity are determined based on the annual maximum utilization hours of photovoltaic power and the annual electricity consumption of the target photovoltaic-storage system configuration area.

[0044] In this context, a photovoltaic (PV) and energy storage system can represent a combined operating system consisting of photovoltaic (PV) power generation units and energy storage units, used to achieve energy regulation and power supply guarantee between PV output and energy storage charging and discharging. The PV-storage system configuration area can represent the target area where the PV-storage system is constructed, characterized by specific solar radiation conditions and load electricity consumption characteristics. The maximum annual utilization hours of PV can represent the upper limit of the equivalent full-load power generation hours per year within the PV-storage system configuration area, calculated based on the available annual solar radiation resources, combined with the installation conditions of PV modules and operational boundary factors, used to characterize the availability of PV power generation in that area. The annual load electricity consumption can represent the total electricity demand of the corresponding power supply area within the PV-storage system configuration area during the annual cycle, used to characterize the scale of electricity demand on the load side of that area. The minimum PV configuration capacity can represent the PV configuration capacity that can cover the lower limit of load demand under a supply-demand matching relationship, based on the maximum annual utilization hours of PV and the annual load electricity consumption. The maximum PV configuration capacity can represent the PV configuration capacity that can cover the upper limit of load demand under a supply-demand matching relationship, based on the maximum annual utilization hours of PV and the annual load electricity consumption.

[0045] In this step, the minimum and maximum photovoltaic configuration capacities are determined based on the maximum annual utilization hours of photovoltaics and the annual electricity consumption of the load in the target photovoltaic-storage system configuration area. This can limit the photovoltaic configuration capacity to a reasonable range that meets the load demand, thereby avoiding situations where the photovoltaic capacity is too small, resulting in insufficient load supply, or too large, resulting in a mismatch between photovoltaic output and load. This provides boundary conditions for the subsequent configuration of photovoltaic-storage system capacity.

[0046] In step S120, the calculation range of photovoltaic configuration capacity and the calculation range of energy storage converter power are determined based on the minimum photovoltaic configuration capacity, the maximum photovoltaic configuration capacity, and the preset photovoltaic capacity calculation step size.

[0047] The photovoltaic (PV) capacity calculation step size represents the interval used when discretizing the capacity between the upper and lower limits of the PV configuration capacity, used to generate different PV configuration capacity values ​​step by step. The PV configuration capacity calculation range represents the set of capacity values ​​determined based on the minimum PV configuration capacity, the maximum PV configuration capacity, and the PV capacity calculation step size, used to characterize all possible ranges of PV configuration capacity under constraints. The power conversion system (PCS) power calculation range represents the set of power values ​​for the PCS determined based on the PV configuration capacity calculation range combined with preset power range parameters and the power step size, used to characterize all possible ranges of PCS power under constraints. The PCS can be defined as a power conversion device used to connect energy storage units to an external power system, capable of bidirectional conversion between DC and AC power during charging and discharging, and regulating and controlling the power transmission process. In this step, the calculation range of photovoltaic configuration capacity and the calculation range of energy storage converter power are determined based on the minimum photovoltaic configuration capacity, the maximum photovoltaic configuration capacity, and the preset photovoltaic capacity calculation step size. This allows the photovoltaic configuration capacity and the energy storage converter power to form a discretized set of values ​​under preset boundary conditions, thereby ensuring that different values ​​are comparable and systematic in the subsequent capacity configuration process.

[0048] In step S130, the energy storage capacity calculation range is determined based on the power calculation range of the energy storage converter and the maximum energy storage capacity hours. Then, the configuration indicators corresponding to different photovoltaic-to-energy storage ratios are determined based on the photovoltaic configuration capacity calculation range, the power calculation range of the energy storage converter, and the energy storage capacity calculation range.

[0049] The maximum energy storage capacity hours represent the longest time an energy storage unit can continuously charge or discharge at full power under the power constraint of the energy storage converter, thus characterizing the upper limit of the energy storage capacity. The energy storage capacity calculation range represents the set of energy storage capacity values ​​determined based on the energy storage converter power calculation range and the maximum energy storage capacity hours, thus characterizing the range of selectable energy storage capacity under constraints. The photovoltaic-energy storage ratio represents the combination relationship between photovoltaic configuration capacity, energy storage converter power, and energy storage capacity, thus characterizing the ratio of photovoltaic to energy storage under different capacity configurations. The configuration index represents the investment cost metric corresponding to a given photovoltaic-energy storage ratio. This investment cost metric can be calculated by combining the unit investment cost parameters of photovoltaic configuration capacity, energy storage converter power, and energy storage capacity with their respective values. Of course, in other embodiments of this disclosure, the configuration index can also represent energy consumption, operating efficiency, equipment utilization rate, or other parameters that can quantitatively evaluate the photovoltaic-energy storage ratio corresponding to different photovoltaic-energy storage ratios.

[0050] In step S140, based on the annual hourly unit photovoltaic capacity output, annual hourly load power, and energy storage charge / discharge rate of the region where the photovoltaic and energy storage system is configured, the performance indicators corresponding to different photovoltaic and energy storage ratios are determined. The performance indicators include load guarantee rate, annual power supply of the photovoltaic and energy storage system, annual abandoned power of the photovoltaic and energy storage system, annual abandoned power rate of the photovoltaic and energy storage system, annual load shortage power, and annual load shortage rate.

[0051] The hourly output per unit of photovoltaic capacity throughout the year represents the power generation value per unit of photovoltaic capacity per hour within the region where the photovoltaic-storage system is configured, characterizing the output characteristics of photovoltaic power generation on an hourly scale throughout the year. The hourly load power throughout the year represents the load power value per hour within the power supply area corresponding to the region where the photovoltaic-storage system is configured, characterizing the electricity demand characteristics of the power supply area on an hourly scale. The energy storage charge / discharge rate represents the ratio of the power of the energy storage unit during the charging or discharging process to its rated power, characterizing the charging and discharging capability of energy storage during operation. Performance indicators represent a set of quantitative indicators based on the operational results of photovoltaic output, load power, and energy storage charge / discharge status, used to measure the operational performance of different photovoltaic-storage ratios. The load guarantee rate represents the proportion of electricity that meets load demand during the annual operating cycle, characterizing the degree of guarantee provided by the photovoltaic-storage system to the load. The annual power supply of the photovoltaic-storage system represents the total electrical energy provided to the load side by photovoltaic and energy storage through coordinated operation during the annual operating cycle. Annual curtailment of photovoltaic (PV) and energy storage (ESS) power represents the electrical energy that remains unused throughout the year's operating cycle due to PV output exceeding load demand and ESS capacity. The annual curtailment rate of PV / ESS power represents the ratio of annual curtailment to total annual power generation, characterizing the utilization rate of PV energy. Annual load deficit represents the electrical energy that fails to meet load demand due to insufficient PV and ESS supply throughout the year's operating cycle. The annual load deficit rate represents the ratio of annual load deficit to annual load consumption, characterizing the degree to which load demand is not met.

[0052] In this step, based on the hourly unit photovoltaic capacity output, hourly load power, and energy storage charge / discharge rate of the region where the photovoltaic-energy storage system is configured, the performance indicators corresponding to different photovoltaic-energy storage ratios are determined. This allows the photovoltaic output, load demand, and energy storage operation status to be quantitatively characterized on an hourly scale. As a result, performance indicators such as power supply guarantee rate, annual photovoltaic-energy storage system power supply, annual photovoltaic-energy storage system curtailment, annual photovoltaic-energy storage system curtailment rate, annual load shortage, and annual load shortage rate are formed throughout the year. This enables the operational performance of the photovoltaic-energy storage ratio to be fully reflected, providing a data foundation for the optimal capacity configuration.

[0053] Step S150: Select candidate optical-storage ratios from different optical-storage ratios that meet the preset reference indicators, and select the target optical-storage ratio with the smallest configuration indicator from the candidate optical-storage ratios for optical-storage system capacity configuration.

[0054] The reference indicators can represent a set of preset parameters used to constrain and screen performance indicators for different photovoltaic-storage ratios. The photovoltaic-storage system capacity configuration can represent the combination of photovoltaic and energy storage system installed capacity determined based on the photovoltaic configuration capacity, energy storage converter power, and energy storage capacity corresponding to the target photovoltaic-storage ratio, used to complete the coordinated configuration of photovoltaics and energy storage. Through step S150, the selection of the photovoltaic-storage ratio can simultaneously meet the requirements of operational reliability and the constraints of the configuration indicators, thereby avoiding excessive redundancy or insufficient operation in the photovoltaic-storage configuration results, and ensuring that the final determined photovoltaic-storage system capacity configuration is reasonable and applicable.

[0055] The technical content of the above embodiments will be described in detail below.

[0056] In some embodiments, the minimum and maximum photovoltaic configuration capacities are determined based on the annual maximum utilization hours of photovoltaic power and the annual electricity consumption of the target photovoltaic-storage system configuration area, specifically including the following technical steps: The first step is to determine the full load guarantee rate of the photovoltaic configuration capacity based on the preset margin, the maximum annual utilization hours of photovoltaics, and the annual electricity consumption of the load.

[0057] Among them, margin can represent the capacity correction amount reserved on the theoretical value to offset factors such as environmental fluctuations and load uncertainty when determining the photovoltaic configuration capacity. Full load guarantee rate can represent the power supply guarantee ratio when the annual electricity consumption of the load can be fully met under theoretical conditions, and its value is 100%. Full load guarantee rate photovoltaic configuration capacity can be represented as the photovoltaic configuration capacity calculated from the maximum annual utilization hours of photovoltaic and the annual electricity consumption of the load under the full load guarantee rate condition. Specifically, the full load guarantee rate photovoltaic configuration capacity can be calculated by the following formula (1): (1) in, This indicates the full guarantee rate of photovoltaic configuration capacity. This indicates a margin, preferably ranging from 1.2 to 1.8. This indicates the annual electricity consumption of the load. This indicates the maximum number of hours of photovoltaic power generation throughout the year.

[0058] The second step is to determine the minimum photovoltaic configuration capacity based on the full guarantee rate and the minimum load guarantee rate.

[0059] The minimum load guarantee rate represents the lower limit of the allowable power supply guarantee during capacity configuration, serving as the basis for calculating the minimum photovoltaic configuration capacity. Specifically, the minimum photovoltaic configuration capacity can be calculated using the following formula (2): (2) in, Indicates the minimum photovoltaic configuration capacity. The percentage represents the minimum load guarantee rate. Preferably, the minimum load guarantee rate can be 60%.

[0060] The third step is to determine the maximum photovoltaic configuration capacity based on the full guarantee rate of the photovoltaic configuration capacity and the highest load guarantee rate.

[0061] Among them, the maximum load guarantee rate can represent the upper limit of the power supply guarantee level allowed in the capacity configuration process, and is used to limit the calculation basis of the maximum photovoltaic configuration capacity. Specifically, the maximum photovoltaic configuration capacity can be calculated by the following formula (3): (3) in, Indicates the maximum photovoltaic configuration capacity. % represents the maximum load guarantee rate, and preferably, the maximum load guarantee rate can be 95%.

[0062] In some embodiments, the calculation step size is based on a preset photovoltaic capacity. Minimum photovoltaic configuration capacity and maximum photovoltaic configuration capacity The following range for calculating photovoltaic configuration capacity can be obtained: Furthermore, based on the aforementioned photovoltaic configuration capacity calculation range, the process for determining the energy storage converter power calculation range may include: determining the energy storage converter power range parameters and the energy storage converter power calculation step size; using the photovoltaic configuration capacity calculation range and the energy storage converter power range parameters, determining the starting and ending values ​​of the energy storage converter power corresponding to each photovoltaic configuration capacity; according to the energy storage converter power calculation step size, progressively taking values ​​between the starting and ending values ​​of the energy storage converter power to obtain multiple energy storage converter powers corresponding to each photovoltaic configuration capacity; and arranging the multiple energy storage converter powers sequentially according to the photovoltaic configuration capacity to obtain the energy storage converter power calculation range.

[0063] The energy storage converter power range parameter represents the power percentage range relative to the photovoltaic (PV) configuration capacity, including a lower and upper limit percentage, used to define the upper and lower bounds of the energy storage converter power for each PV configuration capacity. The energy storage converter power calculation step size represents the interval used when discretizing the energy storage converter power between the initial and final values, used to generate multiple energy storage converter power values ​​step-by-step. The initial energy storage converter power value represents the lower boundary value of the energy storage converter power determined based on the PV configuration capacity calculation range and the energy storage converter power range parameter, used to define the starting point of the energy storage converter power for each PV configuration capacity. The final energy storage converter power value represents the upper boundary value of the energy storage converter power determined based on the PV configuration capacity calculation range and the energy storage converter power range parameter, used to define the ending point of the energy storage converter power for each PV configuration capacity.

[0064] For example, the photovoltaic capacity calculation step size can be... The power range parameters of the energy storage converter can be The power calculation step size for the energy storage converter can be... Based on the above calculation range for photovoltaic configuration capacity, the calculation range for energy storage converter power can be expressed as follows: In some embodiments, the energy storage capacity calculation range is determined based on the energy storage converter power calculation range and the maximum energy storage capacity hours. Specifically, this includes the following technical steps: based on the energy storage converter power calculation range, selecting an energy storage capacity capable of accommodating a full charge of the energy storage converter for one hour as the initial energy storage capacity value; based on the initial energy storage capacity value, sequentially increasing the energy storage capacity in increments of hours until the maximum energy storage capacity hours are reached; using each incrementally obtained energy storage capacity to correspond to each energy storage converter power within the energy storage converter power calculation range, obtaining multiple correspondences between energy storage capacities and energy storage converter powers; and obtaining the energy storage capacity calculation range based on these correspondences.

[0065] The initial energy storage capacity value can represent the minimum energy storage capacity, determined based on the energy storage converter power calculation range, capable of accommodating continuous full-power charging of the energy storage converter for one hour. This initial capacity serves as the starting point for the energy storage capacity calculation range. In the specific implementation, firstly, based on the energy storage converter power calculation range, an energy storage capacity capable of continuous full-power charging for one hour is selected as the initial energy storage capacity value, defining the lower boundary of the energy storage capacity calculation. Then, using the initial energy storage capacity value as a baseline, the energy storage capacity is gradually increased in increments of hours until it reaches the capacity value corresponding to the maximum energy storage capacity hours, thus obtaining a series of discretized energy storage capacity values. Further, each incrementally obtained energy storage capacity is matched with the power of each energy storage converter within the energy storage converter power calculation range, forming multiple correspondences between energy storage capacity and energy storage converter power. Finally, based on these correspondences, the set of all energy storage capacity values ​​satisfying the constraints constitutes the energy storage capacity calculation range, characterizing the range of selectable energy storage capacities under the energy storage converter power conditions. Specifically, when the maximum energy storage capacity hours are... The photovoltaic capacity calculation step size is When the energy storage capacity is calculated, the range can be expressed as follows: In some embodiments, the configuration indicators corresponding to different photovoltaic-storage ratios are determined based on the photovoltaic configuration capacity calculation range, the energy storage converter power calculation range, and the energy storage capacity calculation range. Specifically, this includes the following technical steps: obtaining multiple photovoltaic-storage ratios based on the photovoltaic configuration capacity calculation range, the energy storage converter power calculation range, and the energy storage capacity calculation range, wherein each photovoltaic-storage ratio includes a target photovoltaic configuration capacity, a target energy storage converter power, and a target energy storage capacity; and determining the configuration indicators corresponding to each photovoltaic-storage ratio based on the unit photovoltaic configuration capacity consumption index, the unit energy storage converter power consumption index, and the unit energy storage capacity consumption index.

[0066] Among them, the target photovoltaic configuration capacity can represent the photovoltaic capacity value selected for a certain photovoltaic-storage ratio within the photovoltaic configuration capacity calculation range. The target energy storage converter power can represent the energy storage converter power value selected for a certain photovoltaic-storage ratio within the energy storage converter power calculation range. The target energy storage capacity can represent the energy storage capacity value selected for a certain photovoltaic-storage ratio within the energy storage capacity calculation range. The unit photovoltaic configuration capacity consumption index can represent the consumption measurement value corresponding to each unit photovoltaic configuration capacity, such as the investment cost and energy consumption required for each unit photovoltaic configuration capacity. The unit energy storage converter power consumption index can represent the consumption measurement value corresponding to each unit energy storage converter power, such as the investment cost and energy consumption required for each unit energy storage converter power. The unit energy storage capacity consumption index can represent the consumption measurement value corresponding to each unit energy storage capacity, such as the investment cost and energy consumption required for each unit energy storage capacity. Specifically, the configuration index corresponding to each photovoltaic-storage ratio can be determined by the following formula (4): (4) in, Indicates configuration metrics, This represents the cost per unit of photovoltaic configuration capacity. Indicates the target photovoltaic configuration capacity. This indicates the power consumption per unit of energy storage converter. Indicates the target energy storage converter power. This indicates the cost per unit of energy storage capacity. Indicates the target energy storage capacity. i This can represent the index number within the calculation range of photovoltaic (PV) configuration capacity. Its corresponding value is the number obtained by progressively discretizing the minimum and maximum PV configuration capacities according to the PV capacity calculation step size. i Each photovoltaic configuration capacity. j This can represent the index number within the power calculation range of the energy storage converter, and its corresponding value is the [index number]. i Under a photovoltaic configuration capacity, the first [unit / item] is obtained by progressive discretization based on the power range parameters of the energy storage converter and the power calculation step size of the energy storage converter. j Power of the energy storage converter. k This can represent the index number within the energy storage capacity calculation range, and its corresponding value is the [index number]. i The photovoltaic configuration capacity and the first j Under the condition of a certain energy storage converter power, the initial value of the energy storage capacity is obtained by gradually discretizing the energy storage capacity based on the initial value of the energy storage converter being fully charged for one hour, and then increasing by the number of hours until the maximum energy storage capacity is reached. k Energy storage capacity.

[0067] For example, when the above-mentioned cost indicators refer to investment costs, the configuration indicators corresponding to different photovoltaic-storage ratios at a 30% load guarantee rate, i.e., cost, can be as follows: Figure 2 As shown in the figure, the photovoltaic (PV) capacity installation size and energy storage PCS power are plotted on the horizontal and vertical axes, with configuration indicators as the vertical values, forming a three-dimensional distribution pattern. It can be seen that, under the same PV capacity installation size and energy storage PCS power, the configuration indicators exhibit a stratified distribution characteristic as the energy storage capacity equals the number of full-charge hours of the PCS, which can intuitively reflect the cost differences corresponding to different PV-to-storage ratios.

[0068] In some embodiments, the performance indicators corresponding to different photovoltaic-to-storage ratios are determined based on the annual hourly photovoltaic capacity output, annual hourly load power, and energy storage charge / discharge rate of the region where the photovoltaic-storage system is configured. This includes the following technical steps: The first step is to determine the hourly energy difference for each hour based on the hourly photovoltaic capacity output and hourly load power throughout the year.

[0069] The unit hourly energy difference represents the difference between photovoltaic output and load power in each hour within the power supply area corresponding to the photovoltaic-storage system configuration area. It is used to characterize the balance state of energy supply and demand and the direction of energy flow within that hour. Specifically, the unit hourly energy difference can be determined by the following equation (5): (5) in, Indicates the energy difference per unit hour. Indicates photovoltaic power output. Represents the load power, where, t This indicates that the photovoltaic output for the current time period can be obtained by multiplying the unit photovoltaic capacity output for the current time period by the photovoltaic configuration capacity.

[0070] The second step involves determining the first hourly performance index corresponding to different photovoltaic-storage ratios when the energy difference per unit hour is greater than or equal to zero, based on the energy storage charge / discharge rate and the remaining energy storage capacity. The remaining energy storage capacity represents the unused capacity in the energy storage device at any given time period. The first hourly performance index, determined by combining the energy storage charge / discharge rate and the remaining energy storage capacity when the energy difference per unit hour is greater than zero, characterizes the power supply, abandoned power, and energy storage status of the photovoltaic-storage ratio under conditions of energy surplus at that moment.

[0071] The third step involves determining the second hourly performance index corresponding to different photovoltaic-storage ratios when the energy difference per unit hour is less than zero, based on the energy storage charge-discharge rate and remaining energy storage capacity. This second hourly performance index represents the operational indicators determined by combining the energy storage charge-discharge rate and remaining energy storage capacity when the energy difference per unit hour is less than or equal to zero. It characterizes the power supply, power shortage, and energy storage status of the photovoltaic-storage ratio under insufficient energy conditions at that moment.

[0072] The fourth step is to statistically analyze the performance indicators corresponding to different photovoltaic-storage ratios based on the first and second hourly performance indicators.

[0073] In some embodiments, the first hourly performance index corresponding to different photovoltaic-storage ratios is determined based on the energy storage charge-discharge rate and the remaining energy storage capacity, when the energy difference per unit hour is greater than or equal to zero. This process specifically includes the following technical steps: First, when the unit hour energy difference is greater than or equal to zero, the power of the energy storage converter is determined in response to when the unit hour energy difference is less than or equal to the current moment. and The current time's power supply from the photovoltaic and energy storage system, the current time's abandoned power from the photovoltaic and energy storage system, the current time's load shortage, and the remaining energy storage capacity at the next time step, among which, Indicates the energy difference per unit hour. Indicates the energy storage charge / discharge rate. This indicates the remaining energy storage capacity at the current moment.

[0074] Specifically, when In other words, when the energy difference per unit hour is greater than or equal to zero, it means that the photovoltaic output can meet the load. If there is excess energy, it can be stored in energy storage. At this time, it is necessary to determine the power of the energy storage converter. With excess energy The magnitude relationship is used to clarify the power of the energy storage converter. Will this lead to power wastage?

[0075] when In other words, when the energy difference per unit hour is less than or equal to the power of the energy storage converter at the current moment, it indicates that the power of the energy storage converter at that moment is... It is possible to completely release excess energy without causing power waste. In this case, it is necessary to determine the remaining energy storage capacity at the current moment. With excess energy and energy storage charge / discharge rate The magnitude of the product determines the remaining energy storage capacity at the current moment. Will this lead to power wastage?

[0076] Furthermore, when The time indicates the remaining energy storage capacity at the current moment. It can accommodate excess energy. The system capacity configuration model at this point can be as follows: Figure 3 As shown, the energy source includes photovoltaic output. and load power The difference between photovoltaic output and load power constitutes excess energy at the current moment. The energy storage converter device consists of the energy storage converter power... A power limit is defined to control the amount of excess energy entering the energy storage process. The energy supplied to the energy storage battery is adjusted based on the energy storage charge / discharge rate η to obtain the effective energy that can be received by the energy storage unit. The energy terminal includes the remaining energy storage capacity. With target energy storage capacity This is used to determine whether the available energy can be fully utilized. When the remaining energy storage capacity can meet the needs of energy injection, it indicates that there will be no power curtailment, and the energy flows into the energy storage unit according to the path shown in the diagram. The power supply of the photovoltaic-energy storage system at this current moment is... The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. It can be determined by the following equation (6): (6) when The time indicates the remaining energy storage capacity at the current moment. Insufficient capacity to accommodate excess energy will lead to power curtailment due to limited energy storage. In this case, the system capacity configuration model can be as follows: Figure 4 As shown, the energy source includes photovoltaic output. and load power The difference between photovoltaic output and load power constitutes excess energy at the current moment. The energy storage converter device consists of the energy storage converter power... This limit is used to control the upper limit of excess energy entering the energy storage process, ensuring that the power flowing into the energy storage does not exceed the converter's capacity. The amount of energy charged into the energy storage battery is adjusted based on the energy storage charge / discharge rate η to obtain the effective energy that can be received by the energy storage unit and the amount of energy wasted by the photovoltaic-energy storage system. Energy terminals include remaining energy storage capacity. With target energy storage capacity This is used to determine whether the effective energy can be fully accommodated. Under this condition, due to insufficient remaining energy storage capacity, the corrected energy cannot be fully accommodated, resulting in energy overflow exceeding the capacity constraint, manifested as power curtailment. At this time, the energy storage unit can only receive a portion of the energy matching its remaining capacity; the rest is discarded due to capacity limitations, thus causing power curtailment in the capacity configuration of the photovoltaic-energy storage system. The power supply of the photovoltaic-energy storage system at this current moment is... The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. It can be determined by the following equation (7): (7) Then, in response to the energy difference per unit hour being greater than the power of the energy storage converter at the current moment, the following are determined: and The current power supply of the photovoltaic and energy storage system, the current abandoned power of the photovoltaic and energy storage system, the current load shortage, and the remaining energy storage capacity at the next moment; among which, This represents the power of the energy storage converter at the current moment.

[0077] when In other words, when the energy difference per unit hour is greater than the power of the energy storage converter at the current moment, it indicates that the power of the energy storage converter at the current moment is... If the remaining energy storage capacity is insufficient to completely dissipate excess energy, power curtailment will occur due to the low power output of the energy storage PCS. In this case, it is necessary to determine the remaining energy storage capacity at the current moment. With the current power of the energy storage converter and energy storage charge / discharge rate The magnitude of the product determines the remaining energy storage capacity at the current moment. Will this lead to power wastage?

[0078] Furthermore, when The time indicates the remaining energy storage capacity at the current moment. It can accommodate the energy charged into the PCS at maximum power at that moment. The system capacity configuration model at this time can be as follows: Figure 5 As shown, the energy source includes photovoltaic output. Load power The abandoned power of solar-energy storage system Due to the current remaining energy storage capacity If the system can accommodate the energy charged into the storage PCS at maximum power at that moment, then all the energy flowing through the PCS at that moment will be stored. The power supply of the photovoltaic-storage system at that current moment... The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. It can be determined by the following equation (8): (8) when The time indicates the remaining energy storage capacity at the current moment. If the capacity is insufficient to accommodate the energy charged by the energy storage PCS at maximum power at that moment, power curtailment will occur due to the small energy storage capacity. The system capacity configuration model at this time can be as follows: Figure 6 As shown, the energy source includes photovoltaic output. Load power The abandoned power of solar-energy storage system The difference between photovoltaic output and load power constitutes excess energy at the current moment. This excess energy is transmitted through an energy storage converter. The maximum power value entering the energy storage is limited; excess energy exceeding this power limit will first become a source of wasted electricity. The energy storage battery charging unit will then be charged via an energy storage converter. The limited energy is injected into the energy storage system after being corrected for the energy storage charge / discharge rate η, but due to the remaining capacity of the energy storage... If the energy level is less than the correction energy, some energy cannot be absorbed, and this portion of energy further becomes wasted energy. Energy terminals include remaining energy storage capacity. and target energy storage capacity After the energy storage absorbs a portion of the effective energy, it updates to obtain the remaining energy storage capacity for the next moment. Therefore, in this scenario, the power supply of the photovoltaic-storage system at the current moment... The amount of abandoned power in a photovoltaic-storage system is determined by both the output of photovoltaic power and the effective energy after partial charging by energy storage. It consists of two parts: first, the abandoned electricity exceeding the power of the energy storage converter; and second, the abandoned electricity that cannot be absorbed due to insufficient energy storage capacity. This represents the current power supply of the photovoltaic-energy storage system. The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. It can be determined by the following equation (9): (9) In some embodiments, a second hourly performance index is determined based on the energy storage charge / discharge rate and the remaining energy storage capacity, corresponding to different photovoltaic-storage ratios when the energy difference per unit hour is less than zero. This process specifically includes the following technical steps: First, when the energy difference per unit hour is less than zero, the power of the energy storage converter is determined based on whether the absolute value of the energy difference per unit hour is less than or equal to the current moment. and The current power supply of the photovoltaic and energy storage system, the current abandoned power of the photovoltaic and energy storage system, the current load shortage, and the remaining energy storage capacity at the next moment are all included. This indicates the energy storage capacity at the current moment.

[0079] Specifically, when In other words, when the energy difference per unit hour is less than zero, it means that the photovoltaic output cannot meet the load, and energy storage is needed to provide some power to the load. At this time, it is necessary to determine the power of the energy storage converter at the current moment. with insufficient energy The magnitude relationship is used to determine whether the power of the energy storage converter can fully flow through the insufficient energy. .

[0080] when In other words, when the absolute value of the energy difference per unit hour is less than or equal to the power of the energy storage converter at the current moment, it indicates that the power of the energy storage converter at the current moment is... The energy can flow completely through the insufficient energy without affecting the energy storage to replenish the load's electrical energy. In this case, it is necessary to determine the energy of the energy storage at the current moment. with insufficient energy and energy storage charge / discharge rate The magnitude of the product determines the energy stored at that moment. Whether the load gap can be fully filled.

[0081] Furthermore, when Time indicates the stored energy at the current moment. This can fill the load gap. The system capacity configuration model at this time can be as follows: Figure 7 As shown, the energy source includes photovoltaic output. and load power The remaining shortfall is supplemented by energy storage. When passing through the energy storage converter device, the stored energy passes through the energy storage converter's power... This is converted into effective power supply capacity and corrected by the energy storage charge / discharge rate η to form supplementary power. - The energy provided by the energy storage battery unit is determined by the remaining energy storage capacity. With target energy storage capacity Under this scenario, the remaining energy storage capacity is sufficient to fully compensate for the load shortfall, ensuring that the load power... This is achieved. In the energy terminal, the power supply of the photovoltaic-storage system at the current moment consists of photovoltaic output and energy storage replenishment. The current amount of wasted power from the photovoltaic-storage system is zero, and the current load shortage is also zero. Simultaneously, the remaining energy storage capacity for the next moment is updated. The power supply of the photovoltaic-storage system at this current moment. The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. It can be determined by the following equation (10): (10) when Time indicates the stored energy at the current moment. If the energy storage capacity is insufficient to fill the load gap, power shortages will occur due to the low energy level of the energy storage system. The system capacity configuration model at this time can be as follows: Figure 8 As shown, the energy source includes photovoltaic output. and load power However, due to insufficient photovoltaic output, a load gap was created. When the energy flows through the energy storage converter, the stored energy is converted to obtain usable supplementary power. η, this value is less than the energy demand corresponding to the load gap, therefore it is impossible to fully meet the load. In the energy terminal, the power supply of the photovoltaic-storage system at the current moment consists of photovoltaic output and a portion of stored energy. The current amount of wasted electricity from the photovoltaic-storage system is zero, but the current load is experiencing a power shortage. The value is greater than zero, and the remaining energy storage capacity is updated simultaneously for the next time step. The power supply of the photovoltaic-storage system at this current moment. The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. It can be determined by the following equation (11): (11) Then, in response to the absolute value of the energy difference per unit hour being greater than the power of the energy storage converter at the current moment, the following are determined: and The current power supply of the photovoltaic and energy storage system, the current abandoned power of the photovoltaic and energy storage system, the current load power shortage, and the remaining energy storage capacity at the next moment.

[0082] when In other words, when the absolute value of the energy difference per unit hour is greater than the power of the energy storage converter at the current moment, it indicates that the power of the energy storage converter at the current moment is... Insufficient energy flow, unable to fully utilize the limited energy, will result in power shortage due to the low power of the energy storage converter. In this case, it is necessary to determine the energy storage capacity at the current moment. Energy storage converter power and energy storage charge / discharge rate The magnitude of the product determines the energy stored at that moment. Whether it can supply power at the maximum power of the energy storage converter.

[0083] Furthermore, when Time represents the stored energy at the current moment. It can supply power at the maximum power of the energy storage converter. The system capacity configuration model at this time can be as follows: Figure 9 As shown, the energy source includes photovoltaic output. With energy storage unit capacity Among them, photovoltaic power output Load power directly transmitted to the energy terminal via the energy path The available capacity of an energy storage unit is determined by its remaining energy storage capacity. With energy storage converter power Limited by the current energy gap requiring energy storage replenishment, the energy storage unit operates at its maximum permissible power. Energy is released through an energy storage converter and transmitted to the energy terminal via the energy flow path through the energy storage PCS. The energy terminal receives power from the photovoltaic output. With energy storage converter power The energy. The power supply of the photovoltaic energy storage system at this current moment. The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. It can be determined by the following equation (12): (12) when Time represents the stored energy at the current moment. Insufficient power supply; unable to operate at the maximum power of the energy storage converter, due to insufficient energy storage at this moment. A small capacity leads to power shortages. The system capacity configuration model at this time can be as follows: Figure 10 As shown, the photovoltaic output at the energy source end... Loads to energy terminals Transmitting electrical energy and storing energy capacity remaining energy storage capacity Under the constraint of charge and discharge efficiency, the load is supplemented by the output power of the energy storage converter. When the stored energy is insufficient to support the maximum power output of the energy storage converter, although some energy is transferred through the PCS, a load shortage will still occur at the energy terminal. The power supply of the photovoltaic-storage system at this current moment. The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. It can be determined by the following equation (13): (13) In some embodiments, based on the first hourly performance index and the second hourly performance index, the performance index corresponding to different photovoltaic-storage ratios is statistically analyzed, specifically including the following technical steps: accumulating the photovoltaic-storage system power supply, the photovoltaic-storage system curtailment, and the load shortage for each hour of the year to obtain the annual photovoltaic-storage system power supply, the annual photovoltaic-storage system curtailment, and the annual load shortage; determining the load guarantee rate and the annual load shortage rate based on the annual load shortage and the annual load power consumption; and determining the annual photovoltaic-storage system curtailment rate based on the annual photovoltaic-storage system curtailment and the annual photovoltaic-storage system power supply.

[0084] Specifically, based on the hourly data calculated from 8760 hours throughout the year, the annual power supply of the photovoltaic-storage system is determined using the following formula (14). Annual abandoned power of photovoltaic and energy storage systems Annual power shortage Load guarantee rate Annual load shortage rate and the annual curtailment rate of photovoltaic and energy storage systems : (14) in, This represents the hourly time sequence throughout the year, with values ​​ranging from 1 to 8760. This indicates the annual electricity consumption of the load.

[0085] In some embodiments, candidate photovoltaic-storage ratios that meet preset reference indicators are selected from different photovoltaic-storage ratios. Then, a target photovoltaic-storage ratio with the smallest configuration indicator is selected from the candidate ratios for photovoltaic-storage system capacity configuration. This process includes the following technical steps: First, based on preset reference indicators, performance indicators corresponding to different photovoltaic-storage ratios are constrained and judged. These performance indicators include load guarantee rate, annual power supply of the photovoltaic-storage system, annual power curtailment of the photovoltaic-storage system, annual power curtailment rate of the photovoltaic-storage system, annual load shortage, and annual load shortage rate. The reference indicators may include a lower threshold for the load guarantee rate, an upper threshold for the annual power curtailment rate of the photovoltaic-storage system, an upper threshold for the annual load shortage rate, or a target range constraint for the annual power supply and annual power shortage. Then, a set of candidate photovoltaic-storage ratios whose performance indicators meet the reference indicators is determined, and the configuration indicators corresponding to the candidate ratios are extracted. Finally, the configuration indicators of the candidate photovoltaic-storage ratios are compared to determine the target photovoltaic-storage ratio with the smallest configuration indicator. Based on the photovoltaic configuration capacity, energy storage converter power, and energy storage capacity of the target photovoltaic-storage ratio, the final capacity configuration scheme of the photovoltaic-storage system is determined.

[0086] Figure 11A flowchart illustrating another method for configuring the capacity of a photovoltaic-storage system based on load guarantee rate, according to some embodiments of this disclosure, is shown. Specifically, it includes the following technical steps: In step 1101, the photovoltaic configuration capacity index is... i Energy storage converter power index j Energy storage capacity index k and time index t The initial value is set to 1, which is used to initialize the capacity configuration calculation process.

[0087] In step 1102, the photovoltaic configuration capacity index is determined. i Is it greater than the maximum index of photovoltaic configuration capacity? i max If yes, the process ends; otherwise, proceed to step 1103.

[0088] In step 1103, the power index of the energy storage converter is determined. j Is it greater than the maximum index of the energy storage converter power? j max If yes, proceed to step 1104; otherwise, proceed to step 1105.

[0089] In step 1104, the photovoltaic configuration capacity index is... i Add 1 and index the energy storage converter power. j Reset to 1, then return to step 1102 to continue execution.

[0090] In step 1105, the energy storage capacity index is determined. k Is it greater than the maximum index of energy storage capacity? k max If yes, proceed to step 1106; otherwise, proceed to step 1107.

[0091] In step 1106, the power index of the energy storage converter is... j Add 1 and index the energy storage capacity. k Reset to 1, then return to step 1103 to continue execution.

[0092] In step 1107, based on the current i , j , k The index value gives the corresponding energy storage capacity. and the remaining energy storage capacity Initialize to this capacity value, and k Add 1, then proceed to step 1108.

[0093] In step 1108, the time index is determined. tIs it greater than 8760? If yes, proceed to step 1109; otherwise, proceed to step 1110.

[0094] In step 1109, the time index is... t Reset to 1 and return to step 1105 to continue calculating the next capacity combination.

[0095] In step 1110, the energy difference per unit hour is calculated. Then determine whether it is greater than or equal to zero. If it is, proceed to step 1111; otherwise, proceed to step 1118.

[0096] In step 1111, it is determined whether the absolute value of the energy difference per unit hour is less than or equal to the power of the energy storage converter. If yes, proceed to step 1112; otherwise, proceed to step 1113.

[0097] In step 1112, determine whether... If yes, proceed to step 1114; otherwise, proceed to step 1115.

[0098] In step 1113, determine whether... If yes, proceed to step 1116; otherwise, proceed to step 1117.

[0099] In step 1118, the energy difference per unit hour is determined. Is the absolute value less than or equal to the power of the energy storage converter? If yes, proceed to step 1119; otherwise, proceed to step 1120.

[0100] In step 1119, determine whether... If yes, proceed to step 1121; otherwise, proceed to step 1122.

[0101] In step 1120, determine whether... If yes, proceed to step 1123; otherwise, proceed to step 1124.

[0102] In step 1114, the power supply of the photovoltaic-storage system at the current moment is calculated using the above formula (6). The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. .

[0103] In step 1115, the power supply of the photovoltaic-storage system at the current moment is calculated using the above formula (7). The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. .

[0104] In step 1116, the power supply of the photovoltaic-storage system at the current moment is calculated using the above formula (8). The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. .

[0105] In step 1117, the power supply of the photovoltaic-storage system at the current moment is calculated using the above formula (9). The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. .

[0106] In step 1121, the power supply of the photovoltaic-storage system at the current moment is calculated using the above formula (10). The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. .

[0107] In step 1122, the power supply of the photovoltaic-storage system at the current moment is calculated using the above formula (11). The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. .

[0108] In step 1123, the power supply of the photovoltaic-storage system at the current moment is calculated using the above formula (12). The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. .

[0109] In step 1124, the power supply of the photovoltaic-storage system at the current moment is calculated using the above formula (13). The amount of electricity wasted by the photovoltaic and energy storage system at the current moment Current load power shortage And the remaining energy storage capacity at the next moment. .

[0110] In step 1125, the 8760-hour operation results under the current photovoltaic-storage ratio are accumulated, statistically analyzed, and calculated to obtain the load guarantee rate, annual power supply of the photovoltaic-storage system, annual power curtailment of the photovoltaic-storage system, annual power curtailment rate of the photovoltaic-storage system, annual load shortage, and annual load shortage rate.

[0111] In step 1126, the time index t is incremented by 1, and the process returns to step 1108 to continue the calculation until all photovoltaic configuration capacity, energy storage converter power, and energy storage capacity performance indicators under the photovoltaic-storage ratio are calculated.

[0112] Furthermore, this disclosure also provides a capacity configuration device for a photovoltaic-storage system based on a load guarantee rate. (Refer to...) Figure 12 As shown, the photovoltaic-storage system capacity configuration device 1200 based on load guarantee rate may include: a capacity determination module 1210, a calculation range determination module 1220, a configuration index determination module 1230, a performance index determination module 1240, and a capacity configuration module 1250. Wherein: The configuration capacity determination module 1210 can be used to determine the minimum and maximum photovoltaic configuration capacity based on the annual maximum utilization hours of photovoltaic power and the annual electricity consumption of the load in the target photovoltaic and energy storage system configuration area. The calculation range determination module 1220 can be used to determine the calculation range of photovoltaic configuration capacity and the calculation range of energy storage converter power based on the minimum photovoltaic configuration capacity, the maximum photovoltaic configuration capacity and the preset photovoltaic capacity calculation step size. The configuration index determination module 1230 can be used to determine the energy storage capacity calculation range based on the energy storage converter power calculation range and the maximum energy storage capacity hours, and to determine the configuration index corresponding to different photovoltaic-storage ratios based on the photovoltaic configuration capacity calculation range, the energy storage converter power calculation range, and the energy storage capacity calculation range. The performance index determination module 1240 can be used to determine the performance index corresponding to different photovoltaic-storage ratios based on the annual hourly unit photovoltaic capacity output, annual hourly load power, and energy storage charge and discharge rate of the region where the photovoltaic-storage system is configured. The performance index includes load guarantee rate, annual photovoltaic-storage system power supply, annual photovoltaic-storage system curtailment, annual photovoltaic-storage system curtailment rate, annual load shortage, and annual load shortage rate. The capacity configuration module 1250 can be used to select candidate optical-storage ratios that meet preset reference indicators from different optical-storage ratios, and select the target optical-storage ratio with the smallest configuration indicator from the candidate optical-storage ratios for optical-storage system capacity configuration.

[0113] The specific details of each module in the above-mentioned photovoltaic-storage system capacity configuration device based on load guarantee rate have been described in detail in the corresponding photovoltaic-storage system capacity configuration method based on load guarantee rate, so they will not be repeated here.

[0114] It should be noted that although several modules or units of the photovoltaic-storage system capacity configuration device based on load guarantee rate have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided into multiple modules or units to be embodied.

[0115] Furthermore, in an exemplary embodiment of this disclosure, an electronic device capable of implementing the above-described method for configuring the capacity of a photovoltaic storage system based on a load guarantee rate is also provided.

[0116] Those skilled in the art will understand that various aspects of this disclosure can be implemented as a system, method, or program product. Therefore, various aspects of this disclosure can be embodied in the following forms: a completely hardware embodiment, a completely software embodiment (including firmware, microcode, etc.), or an embodiment combining hardware and software aspects, collectively referred to herein as a "circuit," "module," or "system."

[0117] The following reference Figure 13 To describe an electronic device 1300 according to an embodiment of the present disclosure. Figure 13 The electronic device 1300 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments disclosed herein.

[0118] like Figure 13 As shown, the electronic device 1300 is presented in the form of a general-purpose computing device. The components of the electronic device 1300 may include, but are not limited to: at least one processing unit 1310, at least one storage unit 1320, a bus 1330 connecting different system components (including storage unit 1320 and processing unit 1310), and a display unit 1340.

[0119] The storage unit stores program code, which can be executed by the processing unit 1310, causing the processing unit 1310 to perform the steps described in the "Exemplary Methods" section of this specification according to various exemplary embodiments of this disclosure. The storage unit 1320 may include a readable medium in the form of a volatile storage unit, such as a random access memory (RAM) unit 1321 and / or a cache memory unit 1322, and may further include a read-only memory unit (ROM) unit 1323.

[0120] Storage unit 1320 may also include a program / utility 1324 having a set (at least one) program module 1325, such program module 1325 including but not limited to: operating system, one or more application programs, other program modules and program data, each or some combination of these examples may include an implementation of a network environment.

[0121] Bus 1330 can represent one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0122] Electronic device 1300 can also communicate with one or more external devices 1370 (e.g., keyboard, pointing device, Bluetooth device, etc.), one or more devices that enable a user to interact with electronic device 1300, and / or any device that enables electronic device 1300 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 1350. Furthermore, electronic device 1300 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 1360. As shown, network adapter 1360 communicates with other modules of electronic device 1300 via bus 1330. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with electronic device 1300, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0123] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware.

[0124] In exemplary embodiments of this disclosure, a computer-readable storage medium is also provided, on which a program product capable of implementing the methods described above is stored. In some possible embodiments, various aspects of this disclosure may also be implemented as a program product including program code that, when the program product is run on a terminal device, causes the terminal device to perform the steps described in the "Exemplary Methods" section of this specification according to various exemplary embodiments of this disclosure.

[0125] The program product for implementing the above-described load guarantee rate-based optical storage system capacity configuration method according to embodiments of this disclosure can be a portable compact disc read-only memory (CD-ROM) and include program code, and can run on a terminal device, such as a personal computer. However, the program product of this disclosure is not limited thereto. In this document, the readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0126] The program product may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0127] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of sending, propagating, or transmitting programs for use by or in conjunction with an instruction execution system, apparatus, or device.

[0128] Furthermore, the above figures are merely illustrative of the processes included in the method according to exemplary embodiments of this disclosure and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0129] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for configuring the capacity of a photovoltaic-storage system based on load guarantee rate, characterized in that, include: The minimum and maximum photovoltaic configuration capacities are determined based on the annual maximum utilization hours of photovoltaic systems and the annual electricity consumption of load in the target photovoltaic and energy storage system configuration area. Based on the minimum photovoltaic configuration capacity, the maximum photovoltaic configuration capacity, and the preset photovoltaic capacity calculation step size, the calculation range of photovoltaic configuration capacity and the calculation range of energy storage converter power are determined. Based on the power calculation range of the energy storage converter and the maximum energy storage capacity hours, the energy storage capacity calculation range is determined, and the configuration indicators corresponding to different photovoltaic-to-energy storage ratios are determined based on the photovoltaic configuration capacity calculation range, the power calculation range of the energy storage converter, and the energy storage capacity calculation range. Based on the annual hourly unit photovoltaic capacity output, annual hourly load power, and energy storage charge / discharge rate of the region where the photovoltaic and energy storage system is configured, the performance indicators corresponding to different photovoltaic-energy storage ratios are determined. The performance indicators include load guarantee rate, annual power supply of the photovoltaic and energy storage system, annual power curtailment of the photovoltaic and energy storage system, annual power curtailment rate of the photovoltaic and energy storage system, annual load shortage, and annual load shortage rate. Candidate photoelectric storage ratios that meet preset reference performance indicators are selected from the different photoelectric storage ratios, and the target photoelectric storage ratio with the smallest configuration index is selected from the candidate photoelectric storage ratios for the configuration of the photoelectric storage system capacity.

2. The method for configuring the capacity of a photovoltaic-storage system based on load guarantee rate according to claim 1, characterized in that, The determination of the minimum and maximum photovoltaic configuration capacities based on the annual maximum utilization hours of photovoltaic power and the annual electricity consumption of the target photovoltaic-storage system configuration area includes: The full load guarantee rate photovoltaic configuration capacity is determined based on the preset margin, the maximum annual utilization hours of the photovoltaic system, and the annual electricity consumption of the load. The minimum photovoltaic configuration capacity is determined based on the full guarantee rate photovoltaic configuration capacity and the minimum load guarantee rate. The maximum photovoltaic configuration capacity is determined based on the full guarantee rate photovoltaic configuration capacity and the maximum load guarantee rate.

3. The photovoltaic-storage system capacity configuration method based on load guarantee rate according to claim 1, characterized in that, The process of determining the power calculation range of the energy storage converter includes: Determine the power range parameters of the energy storage converter and the power calculation step size of the energy storage converter; Using the photovoltaic configuration capacity calculation range and the energy storage converter power range parameters, determine the starting and ending power values ​​of the energy storage converter corresponding to each photovoltaic configuration capacity; Based on the power calculation step size of the energy storage converter, the power of the energy storage converter is gradually taken between the starting value and the ending value to obtain multiple energy storage converter powers corresponding to each photovoltaic configuration capacity. The power of the multiple energy storage converters is arranged sequentially according to the photovoltaic configuration capacity to obtain the power calculation range of the energy storage converters.

4. The method for configuring the capacity of a photovoltaic-storage system based on load guarantee rate according to claim 1, characterized in that, The step of determining the energy storage capacity calculation range based on the power calculation range of the energy storage converter and the maximum energy storage capacity hours includes: Based on the power calculation range of the energy storage converter, the energy storage capacity that can accommodate the full charge of the energy storage converter for one hour is selected as the initial value of the energy storage capacity. Based on the initial energy storage capacity, the energy storage capacity is increased sequentially in increments of hours until the maximum energy storage capacity hours are reached. By using the incrementally obtained energy storage capacity, and corresponding to the power of each energy storage converter in the power calculation range of the energy storage converter, multiple correspondences between energy storage capacity and energy storage converter power are obtained. Based on the aforementioned correspondence, the calculation range for the energy storage capacity is obtained.

5. The method for configuring the capacity of a photovoltaic-storage system based on load guarantee rate according to claim 1, characterized in that, The process of determining configuration indicators corresponding to different photovoltaic-to-storage ratios based on the photovoltaic configuration capacity calculation range, the energy storage converter power calculation range, and the energy storage capacity calculation range includes: Multiple photovoltaic-storage ratios are obtained based on the photovoltaic configuration capacity calculation range, the energy storage converter power calculation range, and the energy storage capacity calculation range. Each photovoltaic-storage ratio includes a target photovoltaic configuration capacity, a target energy storage converter power, and a target energy storage capacity. Based on the unit photovoltaic configuration capacity consumption index, the unit energy storage converter power consumption index, and the unit energy storage capacity consumption index, the configuration index corresponding to each photovoltaic-energy storage ratio is determined.

6. The method for configuring the capacity of a photovoltaic-storage system based on load guarantee rate according to claim 1, characterized in that, The determination of performance indicators corresponding to different photovoltaic-storage ratios based on the annual hourly photovoltaic capacity output, annual hourly load power, and energy storage charge / discharge rate of the region where the photovoltaic-storage system is configured includes: Based on the hourly unit photovoltaic capacity output and hourly load power throughout the year, the hourly energy difference corresponding to each hour is determined hourly. Based on the energy storage charge / discharge rate and the remaining energy storage capacity, determine the first hourly performance index corresponding to different photovoltaic-storage ratios when the unit hour energy difference is greater than or equal to zero. Based on the energy storage charge / discharge rate and the remaining energy storage capacity, determine the second hourly performance index corresponding to different photovoltaic-storage ratios when the unit hour energy difference is less than zero. Based on the first hourly performance index and the second hourly performance index, the performance index corresponding to different light-storage ratios is statistically analyzed.

7. The photovoltaic-storage system capacity configuration method based on load guarantee rate according to claim 6, characterized in that, The step of determining the first hourly performance index corresponding to different photovoltaic-storage ratios when the unit hourly energy difference is greater than or equal to zero, based on the energy storage charge-discharge rate and remaining energy storage capacity, includes: When the unit hour energy difference is greater than or equal to zero, in response to the unit hour energy difference being less than or equal to the current moment's energy storage converter power, the following parameters are determined: and The current power supply of the photovoltaic and energy storage system, the current power wastage of the photovoltaic and energy storage system, the current load power shortage, and the remaining energy storage capacity at the next moment; In response to the energy difference per unit hour being greater than the power of the energy storage converter at the current moment, the following are determined: and The current power supply of the photovoltaic and energy storage system, the current power wastage of the photovoltaic and energy storage system, the current load power shortage, and the remaining energy storage capacity at the next moment; in, This indicates the energy difference per unit hour. This indicates the energy storage charge / discharge rate. This indicates the remaining energy storage capacity at the current moment. This represents the power of the energy storage converter at the current moment.

8. The method for configuring the capacity of a photovoltaic-storage system based on load guarantee rate according to claim 7, characterized in that, The step of determining the second hourly performance index corresponding to different photovoltaic-storage ratios when the unit hourly energy difference is less than zero, based on the energy storage charge-discharge rate and remaining energy storage capacity, includes: When the unit hour energy difference is less than zero, in response to the absolute value of the unit hour energy difference being less than or equal to the power of the energy storage converter at the current moment, the following determinations are made respectively. and The current power supply of the photovoltaic and energy storage system, the current power wastage of the photovoltaic and energy storage system, the current load power shortage, and the remaining energy storage capacity at the next moment; In response to the absolute value of the unit hour energy difference being greater than the current energy storage converter power, the following are determined: and The current power supply of the photovoltaic and energy storage system, the current abandoned power of the photovoltaic and energy storage system, the current load shortage, and the remaining energy storage capacity at the next moment; among which, This indicates the energy storage capacity at the current moment.

9. The method for configuring the capacity of a photovoltaic-storage system based on load guarantee rate according to claim 8, characterized in that, The step of calculating the performance indicators corresponding to different light-storage ratios based on the first hourly performance indicator and the second hourly performance indicator includes: The power supply, power curtailment, and load deficit of the photovoltaic and energy storage system at the current moment are summed up for each hour of the year to obtain the power supply, power curtailment, and load deficit of the photovoltaic and energy storage system for the whole year. The load guarantee rate and the annual load shortage rate are determined based on the annual load shortage and the annual load consumption. The annual curtailment rate of the photovoltaic and energy storage system is determined based on the annual curtailment of the photovoltaic and energy storage system and the annual power supply of the photovoltaic and energy storage system.

10. A capacity configuration device for a photovoltaic-storage system based on load guarantee rate, used to implement the capacity configuration method for a photovoltaic-storage system based on load guarantee rate as described in any one of claims 1 to 9, characterized in that, The device includes: The configuration capacity determination module is used to determine the minimum and maximum photovoltaic configuration capacity based on the annual maximum utilization hours of photovoltaics and the annual electricity consumption of the load in the target photovoltaic and energy storage system configuration area. The calculation range determination module is used to determine the calculation range of photovoltaic configuration capacity and the calculation range of energy storage converter power based on the minimum photovoltaic configuration capacity, the maximum photovoltaic configuration capacity and the preset photovoltaic capacity calculation step size; The configuration index determination module is used to determine the energy storage capacity calculation range based on the power calculation range of the energy storage converter and the maximum energy storage capacity hours, and to determine the configuration index corresponding to different photovoltaic-storage ratios based on the photovoltaic configuration capacity calculation range, the power calculation range of the energy storage converter, and the energy storage capacity calculation range. The performance index determination module is used to determine the performance index corresponding to different photovoltaic-storage ratios based on the annual hourly unit photovoltaic capacity output, annual hourly load power, and energy storage charge-discharge rate of the region where the photovoltaic-storage system is configured. The performance index includes load guarantee rate, annual power supply of the photovoltaic-storage system, annual power curtailment of the photovoltaic-storage system, annual power curtailment rate of the photovoltaic-storage system, annual load shortage, and annual load shortage rate. The capacity configuration module is used to select candidate optical-storage ratios from the different optical-storage ratios that meet the preset reference indicators, and select the target optical-storage ratio with the smallest configuration indicator from the candidate optical-storage ratios for optical-storage system capacity configuration.

Images