Method and system for enabling energy storage power utilization side to participate in power grid frequency modulation

Abstract

The invention discloses a method and a system for an energy storage power utilization side to participate in power grid frequency modulation. The method comprises the following steps: acquiring first target power, and acquiring a first target rotating speed according to the first target power; adjusting the first output power according to the first target rotating speed to enable the first actual rotating speed to be the same as the first target rotating speed, and performing secondary frequency modulation; and obtaining a target power grid frequency, and judging whether primary frequency modulation is performed in combination with a first judgment condition. The stability and reliability of the power grid are improved, the advantages of the compressed air energy storage technology are fully utilized, and an effective technical solution is provided for responding to renewable energy source access and power demand fluctuation.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and particularly to a method and system for a power consumption side of energy storage to participate in power grid frequency modulation. Background Art

[0002] With the wide application of renewable energy and the continuous growth of power demand, the stability and reliability of the power grid are facing unprecedented challenges. Traditional power systems mainly rely on fossil fuel power plants to regulate frequency and balance power supply and demand, but this mode has limitations in coping with rapidly changing power demand and the access of intermittent renewable energy. Compressed Air Energy Storage (CAES), as an efficient and environmentally friendly energy storage technology, can store energy during low-power consumption periods and release energy during high-power consumption periods, effectively alleviating the pressure on the power grid. However, in order to fully utilize the frequency modulation ability of the CAES system, advanced frequency modulation methods need to be developed to achieve fast and accurate power regulation.

[0003] Although existing power systems have adopted a variety of frequency modulation technologies and means, such as the frequency modulation of traditional thermal power plants and the rapid response of pumped-storage power stations, there are still obvious deficiencies in the research and application of frequency modulation technologies on the power consumption side of energy storage. Currently, most frequency modulation methods mainly focus on the power generation side, and the output power of generator sets is adjusted to maintain the stability of the power grid frequency. On the power consumption side of energy storage, the existing research and application of frequency modulation technologies are relatively lagging, the frequency modulation technology means on the power consumption side of energy storage are relatively single, mainly relying on the charge and discharge operations of the Battery Energy Storage System (BESS). The frequency modulation potential of the compressed air energy storage system has not been fully utilized, and there is a lack of effective control strategies and technical means to carry out fast and accurate frequency modulation on the power consumption side of energy storage. Summary of the Invention

[0004] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title, but such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the above existing problems, the present invention is proposed.

[0006] Therefore, the present invention provides a method and system for a power consumption side of energy storage to participate in power grid frequency modulation, which can solve the problems mentioned in the background art.

[0007] To solve the above technical problems, the present invention provides the following technical solutions:

[0008] In a first aspect, the present invention provides a method for an energy storage on the power consumption side to participate in power grid frequency regulation, including:

[0009] Obtain a first target power, and obtain a first target speed according to the first target power;

[0010] Adjust the first output power according to the first target speed so that the first actual speed is the same as the first target speed, and perform secondary frequency regulation;

[0011] At the same time, obtain the target power grid frequency, and combine the first judgment condition to judge whether to perform primary frequency regulation.

[0012] As a preferred solution of the method for the energy storage on the power consumption side to participate in power grid frequency regulation according to the present invention, wherein: the obtaining of the first target power and obtaining the first target speed according to the first target power includes:

[0013] Preset a first mapping model;

[0014] The first mapping model is any model with the first target power as the input and the first target speed or a model that can directly or indirectly obtain the first target speed as the output;

[0015] Obtain the first target speed according to the first mapping model.

[0016] As a preferred solution of the method for the energy storage on the power consumption side to participate in power grid frequency regulation according to the present invention, wherein: the first judgment condition includes:

[0017] Preset a first deviation threshold;

[0018] Calculate a frequency deviation value according to the target power grid frequency and the standard frequency;

[0019] Compare the frequency deviation value with the first deviation threshold.

[0020] As a preferred solution of the method for the energy storage on the power consumption side to participate in power grid frequency regulation according to the present invention, wherein: the obtaining of the target power grid frequency and combining the first judgment condition to judge whether to perform primary frequency regulation includes:

[0021] If the frequency deviation value is not greater than the first deviation threshold, then primary frequency regulation is not performed at this time;

[0022] If the frequency deviation value is greater than the first deviation threshold, then primary frequency regulation is performed at this time, and corresponding primary frequency regulation is performed by establishing a mapping relationship between the first intake valve opening and the frequency deviation value.

[0023] As a preferred embodiment of the method for the energy storage on the power consumption side to participate in power grid frequency modulation according to the present invention, wherein: the energy storage on the power consumption side at least includes a compressor, a frequency converter, a high-pressure storage tank, an intake valve, a control unit, a detection device, and a safety protection device;

[0024] After obtaining the first target power, obtain the first target speed of the compressor according to the first target power;

[0025] Adjust the first output power of the frequency converter according to the first target speed, so that the first actual speed of the compressor is the same as the first target speed.

[0026] As a preferred embodiment of the method for the energy storage on the power consumption side to participate in power grid frequency modulation according to the present invention, wherein: the primary frequency modulation by establishing the mapping relationship between the first intake valve opening and the frequency deviation value includes:

[0027] The mapping relationship is any mapping relationship for determining the first intake valve opening of the intake valve through the frequency deviation value;

[0028] The mapping relationship includes determining the mapping relationship by using a preset scaling factor.

[0029] As a preferred embodiment of the method for the energy storage on the power consumption side to participate in power grid frequency modulation according to the present invention, wherein: the determining the mapping relationship by using a preset scaling factor includes:

[0030] Collect the operation data of the compressor, at least including different speeds, intake air flow rates, and power output parameters;

[0031] Analyze the historical frequency change data of the power grid to determine the frequency modulation requirements under different frequency deviations;

[0032] Comprehensively consider the response characteristics of the compressor and the frequency modulation requirements of the power grid, and optimize the value of the scaling factor through experiments and simulations;

[0033] Store the optimized scaling factor in the control unit for real-time calculation of the adjustment amount of the intake valve.

[0034] In a second aspect, the present invention provides a system for the energy storage on the power consumption side to participate in power grid frequency modulation, including:

[0035] A speed determination module, configured to obtain the first target power and obtain the first target speed according to the first target power;

[0036] A secondary frequency modulation module, configured to adjust the first output power according to the first target speed so that the first actual speed is the same as the first target speed for secondary frequency modulation;

[0037] A primary frequency modulation module, configured to obtain the target power grid frequency and determine whether to perform primary frequency modulation in combination with the first judgment condition.

[0038] In a third aspect, the present invention provides a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of the method described above are implemented.

[0039] In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described above are implemented.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention proposes a method and system for a power consumption side of energy storage to participate in power grid frequency modulation. A first target power is obtained, and a first target speed is obtained according to the first target power; the first output power is adjusted according to the first target speed so that the first actual speed is the same as the first target speed for secondary frequency modulation; a target power grid frequency is obtained, and it is judged whether to perform primary frequency modulation in combination with a first judgment condition. This not only improves the stability and reliability of the power grid, but also makes full use of the advantages of compressed air energy storage technology, providing an effective technical solution for coping with the access of renewable energy and power demand fluctuations. Secondary frequency modulation ensures that the system can quickly adjust the power output according to the power grid dispatching instructions by precisely adjusting the compressor speed to maintain the power supply-demand balance of the power grid. Primary frequency modulation can quickly respond when the power grid frequency changes instantaneously by quickly adjusting the intake valve opening, helping to stabilize the power grid frequency and prevent excessive frequency fluctuations. Secondary frequency modulation uses a frequency converter to adjust the speed, with high adjustment accuracy and response speed, and can adapt to power demand under different working conditions. Primary frequency modulation realizes fast power adjustment through simple mechanical adjustment (intake valve opening), is suitable for emergency frequency modulation requirements in a short time, and improves the flexibility and response ability of the system. Secondary frequency modulation avoids unnecessary energy waste by precisely controlling the compressor speed, improving the energy efficiency of the system. Primary frequency modulation reduces system losses caused by frequency fluctuations by quickly adjusting the intake air flow, further optimizing energy utilization and reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0042] Figure 1 It is a method flow chart of a method and system for a power consumption side of energy storage to participate in power grid frequency modulation provided by an embodiment of the present invention;

[0043] Figure 2Internal structure diagram of a computer device for a method and system for a power consumption side of an energy storage to participate in power grid frequency modulation according to an embodiment of the present invention. Detailed implementation manners

[0044] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] Embodiment 1

[0046] Referring to Figure 1 - Figure 2 , which is the first embodiment of the present invention. This embodiment provides a method and system for a power consumption side of an energy storage to participate in power grid frequency modulation, including:

[0047] In the existing related technologies, there are some problems. For example, traditional power grid frequency modulation means often rely on the regulation of thermal power plants, which not only have a slow response speed but also high energy consumption, causing a certain impact on the environment. In addition, when the existing energy storage systems participate in power grid frequency modulation, there is a lack of an efficient coordination mechanism, resulting in low resource utilization rate and difficulty in achieving precise frequency control. These problems have restricted the stable operation of the power grid and the efficient utilization of energy to a certain extent.

[0048] This application provides a method that can effectively solve the above-mentioned problems. Next, multiple embodiments will be combined to elaborate in detail how to implement the method for a power consumption side of an energy storage to participate in power grid frequency modulation;

[0049] Figure 1 The flowchart of a method for a power consumption side of an energy storage to participate in power grid frequency modulation is shown, including:

[0050] S101, obtaining a first target power and obtaining a first target rotational speed according to the first target power;

[0051] In an optional embodiment, in order to enable the power consumption side of the energy storage to participate in power grid frequency modulation, it is necessary to obtain the frequency of the power grid dispatching center obtained by the power consumption side of the energy storage for subsequent operations. Therefore, a frequency monitoring device can be installed on the power consumption side of the energy storage to collect power grid frequency data in real time and transmit these data to the control center. The control center calculates the required adjustment power according to the received frequency data in combination with a preset frequency modulation strategy.

[0052] In the embodiment of the present application, the power consumption side of the energy storage at least includes a compressor, a frequency converter, a high-pressure storage tank, an intake valve, a control unit, a detection device, and a safety protection device;

[0053] After obtaining the first target power, obtain the first target speed of the compressor according to the first target power;

[0054] Adjust the first output power of the frequency converter according to the first target speed so that the first actual speed of the compressor is the same as the first target speed.

[0055] Exemplarily, the power consumption side of the energy storage of the present application is a compressed air energy storage system, which mainly includes the following components:

[0056] In an alternative embodiment, the compressor is used to compress air and store it in a high-pressure storage tank. The speed of the compressor can be adjusted by a frequency converter to achieve secondary frequency modulation.

[0057] In an alternative embodiment, the frequency converter is electrically connected to the compressor and is used to adjust the speed of the compressor. The frequency converter controls the speed of the compressor by changing the output frequency, thereby achieving precise power regulation.

[0058] In an alternative embodiment, the high-pressure storage tank is used to store compressed air. The design of the storage tank needs to consider pressure resistance and safety.

[0059] In an alternative embodiment, the intake valve is installed at the intake port of the compressor and is used to adjust the air flow entering the compressor. By adjusting the opening degree of the intake valve, primary frequency modulation can be achieved.

[0060] In an alternative embodiment, the control unit is responsible for receiving grid dispatching instructions, monitoring the grid frequency and the operating status of the compressor, and controlling the actions of the frequency converter and the intake valve. The control unit usually includes a central processing unit, a data acquisition module and a communication module.

[0061] In an alternative embodiment, the detection device is used to monitor key parameters such as grid frequency, compressor speed, and intake air flow in real time, and feed back this data to the control unit.

[0062] In an alternative embodiment, the safety protection device includes overload protection, overheat protection, pressure protection, etc., to ensure that the system can safely shut down or resume normal operation in case of anomalies.

[0063] In an alternative embodiment, receiving the first target power from the grid dispatching center includes:

[0064] Adopt an efficient communication protocol to ensure that the target power instruction can be transmitted to the control unit quickly and accurately. The communication protocol supports multiple communication methods, including Ethernet, wireless communication, and optical fiber communication.

[0065] In an alternative embodiment, the communication protocol further includes a data verification and checking mechanism to ensure the integrity and accuracy of the received target power instruction. Data verification includes checksum verification and data format checking.

[0066] In an alternative embodiment, a multi-level redundancy design is adopted to ensure that the system can still receive scheduling instructions normally even when a certain communication path or device fails. The redundancy design includes a backup communication path and a backup control unit.

[0067] In an alternative embodiment, the communication priority is dynamically adjusted according to the urgency of the power grid scheduling instruction to ensure that high-priority scheduling instructions are processed first in case of emergency.

[0068] In an alternative embodiment, intelligent parsing and processing technologies are adopted to quickly parse and process the received scheduling instructions to generate corresponding control commands. The intelligent parsing technology includes natural language processing and rule engines.

[0069] In the embodiment of the present application, obtaining the first target power and obtaining the first target speed according to the first target power includes:

[0070] Presetting a first mapping model;

[0071] The first mapping model is any model with the first target power as the input and the first target speed or any model that can directly or indirectly obtain the first target speed as the output;

[0072] Obtaining the first target speed according to the first mapping model.

[0073] In an alternative embodiment, the first mapping model can be constructed using machine learning algorithms. Through training with a large amount of historical data, the model can accurately predict the optimal speed at different powers. The specific steps include data preprocessing, feature extraction, model training, and verification. In the data preprocessing stage, the original data is cleaned and standardized; in the feature extraction stage, feature parameters that have a significant impact on the speed are selected; in the model training stage, algorithms such as support vector machines and neural networks are used for training; in the verification stage, cross-validation is used to ensure the generalization ability and accuracy of the model. Finally, the first mapping model can quickly and accurately output the target speed in practical applications, improving the system's frequency modulation efficiency.

[0074] In an alternative embodiment, the first mapping model can also be optimized using deep learning algorithms to further improve the prediction accuracy and stability of the model. Specifically, a convolutional neural network (CNN) or a recurrent neural network (RNN) can be selected as the basic architecture, combined with a long short-term memory network (LSTM) to process time series data, so as to better capture the complex relationship between power and speed.

[0075] In another optional embodiment, during the data preprocessing stage, in addition to the conventional cleaning and normalization processes, data augmentation techniques can also be introduced to increase the diversity of the model's training samples. In the feature extraction stage, an automatic feature extraction mechanism is utilized to reduce manual intervention and improve the comprehensiveness and effectiveness of the features. In the model training stage, distributed computing and GPU acceleration are adopted to shorten the training time and enhance the model performance. In the verification stage, more actual working condition data is introduced for testing to ensure the robustness and reliability of the model in practical applications.

[0076] It should be noted that through these optimization measures, the first mapping model can still maintain high-efficiency and accurate rotational speed prediction capabilities in a complex and changing power grid environment, providing strong technical support for power grid frequency regulation.

[0077] In an optional embodiment, the first mapping model can also be completed by looking up a pre-stored power-rotational speed mapping table or using a mathematical model. The advantage of this method is that the pre-stored mapping table can quickly respond to query requests and is suitable for scenarios with high real-time requirements. The mathematical model, on the other hand, provides higher flexibility and adaptability and can be dynamically adjusted under different working conditions. In specific implementation, an appropriate strategy can be selected according to actual needs, or the two can be combined to achieve better performance.

[0078] In another optional embodiment, in order to further improve the accuracy and stability of the model, an online learning mechanism can be introduced to enable the model to be updated and optimized in real time according to the latest operation data.

[0079] It should be noted that through these comprehensive measures, the first mapping model can not only meet the real-time requirements of power grid frequency regulation but also maintain high-efficiency and stable prediction performance under different working conditions, providing a solid technical guarantee for the stable operation of the power grid.

[0080] In the embodiments of the present application, there is no limitation on the design of the first mapping model;

[0081] However, it should be noted that to establish the first mapping model by looking up a pre-stored power-rotational speed mapping table designed based on the compressor characteristic curve, it is necessary to look up the pre-stored power-rotational speed mapping table and obtain the corresponding target rotational speed according to the target power value;

[0082] By using a mathematical model to calculate the target rotational speed, the mathematical model includes but is not limited to:

[0083] P = kN 3

[0084] Where P is the target power, k is a constant depending on the design parameters of the compressor. N is the target rotational speed.

[0085] It should be noted that the pre-stored power-speed mapping table includes multiple power values and their corresponding optimal speed values, and the mapping table is established through experimental data and simulation results.

[0086] It should also be noted that the mathematical model further includes a correction coefficient for correcting errors caused by environmental factors, and the correction coefficient is dynamically adjusted through historical data and real-time data.

[0087] It should also be noted that obtaining the first target power and obtaining the first target speed based on the first target power can ensure that the system more precisely controls the operating state of the compressor during the frequency modulation process, thereby improving the overall frequency modulation efficiency. Specifically, by precisely matching the target power and the target speed, energy loss can be effectively reduced, and additional power consumption caused by speed deviation can be avoided, thereby enhancing the economy and reliability of the system. In addition, this precise control also helps to extend the service life of the equipment, reduce maintenance costs, and ensure the stability and safety of the power grid frequency modulation operation. Generally speaking, the optimization of this step not only improves the operating performance of the system, but also provides strong support for the efficient and stable operation of the power grid.

[0088] S102. Adjust the first output power according to the first target speed so that the first actual speed is the same as the first target speed, and perform secondary frequency modulation.

[0089] In an optional embodiment, during the process of adjusting the first output power according to the first target speed, the system will continuously monitor the difference between the actual speed and the target speed, and fine-tune the output power through a feedback control mechanism. This dynamic adjustment strategy not only ensures the precise matching of speeds, but also further optimizes the energy utilization rate.

[0090] In an optional embodiment, the system will also record the detailed data of each frequency modulation operation for subsequent analysis and optimization of the algorithm, so as to continuously improve the accuracy of frequency modulation control and the overall performance of the system. In this way, the energy storage side on the power consumption side can play a more efficient and stable role when participating in the power grid frequency modulation, providing a solid guarantee for the stable operation of the power grid.

[0091] Exemplarily, the target power P is received from the power grid dispatching center target .

[0092] Furthermore, based on the compressor characteristic curve, the speed N required to reach the target power is calculated target . This process is completed by looking up the pre-stored power-speed mapping table or using the mathematical model.

[0093] Furthermore, adjust the output frequency f of the frequency converter output so that the actual speed of the compressor is equal to the target speed.

[0094] In an alternative embodiment, the compressor characteristic curve can be continuously updated and optimized based on actual operating data to ensure accurate prediction of the required rotational speed under different operating conditions. In this way, the system can better adapt to various complex situations and improve the flexibility and reliability of frequency modulation operation.

[0095] In an alternative embodiment, the dynamic adjustment of the characteristic curve can also reduce errors caused by environmental changes or equipment aging, further enhancing the overall performance and stability of the system.

[0096] It should be noted that in practical applications, this optimization strategy significantly improves the performance of the energy storage power consumption side in grid frequency modulation, providing strong support for the safe operation of the grid.

[0097] It should also be noted that adjusting the first output power according to the first target rotational speed so that the first actual rotational speed is the same as the first target rotational speed, and performing secondary frequency modulation can significantly improve the response speed and frequency modulation accuracy of the system. By precisely matching the target rotational speed with the actual rotational speed, power fluctuations caused by rotational speed deviations are reduced, ensuring the stability of the grid frequency. In addition, the effective implementation of secondary frequency modulation helps to reduce the energy consumption of the system, extend the service life of the equipment, and further improve the overall operating efficiency. Specifically, the secondary fine-tuning performed on the basis of primary frequency modulation can more precisely correct rotational speed deviations, enabling the system to maintain an optimal working state under different load conditions, thereby achieving higher frequency modulation effects and economy.

[0098] S103, simultaneously obtain the target grid frequency, and determine whether to perform primary frequency modulation in combination with the first judgment condition.

[0099] In an alternative embodiment, the first judgment condition can be whether the deviation between the target grid frequency and the actual grid frequency exceeds a preset threshold. If the deviation exceeds this threshold, a primary frequency modulation operation is triggered to ensure that the grid frequency quickly returns to the safe range. The setting of this preset threshold can effectively avoid frequent frequency modulation operations, reduce the system burden, and at the same time ensure the stability and reliability of the grid frequency. Through this dynamic adjustment mechanism, the system can flexibly respond to various frequency fluctuations in a complex and changing grid environment to ensure the efficient operation of the grid.

[0100] In an alternative embodiment, the first judgment condition can also be determined by other methods. For example, machine learning algorithms can be introduced to deeply analyze historical grid frequency data, predict future frequency fluctuation trends, and thus dynamically adjust the preset threshold. This method not only improves the intelligent level of frequency modulation but also continuously optimizes the judgment condition according to real-time data, making the frequency modulation operation more accurate and efficient.

[0101] In an optional embodiment, a power grid load prediction model can also be combined to comprehensively consider various factors, such as weather changes and peak electricity consumption periods, to further refine the frequency modulation strategy and ensure the stable operation of the power grid under different working conditions. Through these diverse judgment condition settings, the system can more flexibly respond to various complex situations and improve the overall frequency modulation performance of the power grid.

[0102] In the embodiment of the present application, the first judgment condition includes:

[0103] A preset first deviation threshold;

[0104] Calculate the frequency deviation value according to the target power grid frequency and the standard frequency;

[0105] Compare the frequency deviation value with the first deviation threshold.

[0106] In an optional embodiment, the first deviation threshold can be dynamically adjusted according to the actual operation data of the power grid and the historical frequency fluctuation conditions. Specifically, the system can monitor the change of the power grid frequency in real time and conduct statistical analysis in combination with historical data to determine an optimal deviation threshold range.

[0107] In an optional embodiment, an adaptive algorithm can also be introduced so that the first deviation threshold can be automatically adjusted according to the change of the power grid load, thereby ensuring that the sensitivity and accuracy of the frequency modulation operation can be effectively guaranteed under different load conditions. In this way, not only the adaptive ability of the frequency modulation system is improved, but also the stability and reliability of the power grid operation can be significantly enhanced.

[0108] In an optional embodiment, a standard value can be set, and the frequency deviation value, that is, the difference value, is calculated through this standard value and the target power grid frequency.

[0109] In the embodiment of the present application, obtaining the target power grid frequency and judging whether to perform primary frequency modulation in combination with the first judgment condition includes:

[0110] If the frequency deviation value is not greater than the first deviation threshold, then no primary frequency modulation is performed at this time;

[0111] If the frequency deviation value is greater than the first deviation threshold, then primary frequency modulation is performed at this time, and the corresponding primary frequency modulation is performed by establishing a mapping relationship between the first intake valve opening and the frequency deviation value.

[0112] In the embodiment of the present application, performing the corresponding primary frequency modulation by establishing a mapping relationship between the first intake valve opening and the frequency deviation value includes:

[0113] The mapping relationship is any mapping relationship for determining the first intake valve opening of the intake valve through the frequency deviation value;

[0114] The mapping relationship includes determining the mapping relationship by using a preset scaling factor.

[0115] In an alternative embodiment, the mapping relationship can be obtained through experimental data or historical data analysis to ensure that the intake valve opening can be accurately adjusted at different frequency deviation values to achieve the stability of the grid frequency. Specifically, multiple different intake valve opening intervals can be set according to the magnitude of the frequency deviation value, and each interval corresponds to a specific opening value.

[0116] In an alternative embodiment, an adaptive algorithm can also be introduced to dynamically adjust the mapping relationship according to the real-time monitored grid frequency change, further improving the accuracy and response speed of frequency modulation. In practical applications, the establishment and optimization of this mapping relationship will significantly improve the effect of the energy storage on the power consumption side participating in grid frequency modulation and ensure the stability of grid operation.

[0117] In an alternative embodiment, the mapping relationship can also be realized by establishing a mapping model or a mapping relationship table. The mapping model or the mapping relationship table can be dynamically updated according to historical data and real-time data to ensure the accuracy and timeliness of the mapping relationship.

[0118] It should be noted that in this way, not only can the accuracy of frequency modulation be improved, but also the sudden change of the grid frequency can be effectively dealt with. In addition, the design of the mapping model or the relationship table should consider various factors, such as ambient temperature, equipment aging, etc., to ensure good frequency modulation effect under different working conditions.

[0119] In an alternative embodiment, in actual operation, maintenance personnel can adjust and optimize the mapping model or the relationship table regularly according to the system feedback to further improve the overall performance of the system.

[0120] In the embodiment of the present application, using a preset scaling factor to determine the mapping relationship includes:

[0121] Collect the operation data of the compressor, including at least different rotational speeds, intake air flow rates, and power output parameters;

[0122] Analyze the historical frequency change data of the grid to determine the frequency modulation requirements under different frequency deviations;

[0123] Comprehensively consider the response characteristics of the compressor and the frequency modulation requirements of the grid, and optimize the value of the scaling factor through experiments and simulations;

[0124] Store the optimized scaling factor in the control unit for real-time calculation of the adjustment amount of the intake valve.

[0125] Exemplarily, use a sensor to monitor the real-time frequency f of the grid grid , and compare it with the standard frequency f std for comparison.

[0126] Further, the frequency deviation Δf is defined as:

[0127] Δf = f grid - f std

[0128] Further, according to the frequency deviation Δf and a preset scale factor K p , calculate the adjustment amount Δθ of the intake valve opening:

[0129] Δθ = K p ·Δf

[0130] where K p is a scale factor preset according to the compressor characteristics and grid demand.

[0131] Further, according to the calculated value of Δθ, adjust the position of the intake valve to increase or decrease the air flow rate entering the compressor, thereby changing the power output of the compressor and helping to stabilize the grid frequency.

[0132] Further, the scale factor K p is preset according to the compressor characteristics and grid demand, specifically including:

[0133] Collect the operating data of the compressor, including parameters such as different rotational speeds, intake air flow rates, and power outputs;

[0134] Analyze the historical frequency change data of the grid to determine the frequency regulation requirements under different frequency deviations;

[0135] Comprehensively consider the response characteristics of the compressor and the grid frequency regulation requirements, and optimize the value of the scale factor K p through experiments and simulations;

[0136] Store the optimized scale factor K p in the control unit for real-time calculation of the adjustment amount of the intake valve.

[0137] It should be noted that during the process of primary frequency regulation and secondary frequency regulation, continuously monitor the system status to ensure the safety and efficiency of the compressor operation;

[0138] When an abnormal situation is detected, automatically take measures to restore the normal operation of the system or trigger the safety shutdown procedure.

[0139] In an alternative embodiment, the above steps can also be designed with a sequential logic. For example, first obtain the first target power, and obtain the first target rotational speed according to the first target power; adjust the first output power according to the first target rotational speed so that the first actual rotational speed is the same as the first target rotational speed for secondary frequency modulation; then obtain the target grid frequency after the rotational speed adjustment, and determine whether to perform primary frequency modulation in combination with the first judgment condition.

[0140] It should be noted that the accuracy and response speed of frequency modulation can be improved. By real-time monitoring the grid frequency and the operating state of the compressor, the system can quickly adjust the output power of the compressor to meet the grid's frequency modulation requirements. In addition, this method can also optimize the operating efficiency of the compressor, reduce energy consumption, and extend the service life of the equipment. At the same time, through the sequential logic design, the stability and reliability of the frequency modulation process can be ensured, avoiding system shutdown or failure caused by misoperation or abnormal conditions. These advantages make this method have significant advantages in the energy storage power consumption side participating in grid frequency modulation.

[0141] In an alternative embodiment, it is also possible to first obtain the target grid frequency after the rotational speed adjustment, determine whether to perform primary frequency modulation in combination with the first judgment condition, obtain the first target power after the primary frequency modulation, and obtain the first target rotational speed according to the first target power; then adjust the first output power according to the first target rotational speed so that the first actual rotational speed is the same as the first target rotational speed for secondary frequency modulation;

[0142] It should be noted that these operations with sequential order are actually derived from the methods extracted in this application. They can either perform frequency modulation operations separately and simultaneously or perform frequency modulation operations according to the above sequential logic. Relevant technicians can choose according to actual needs.

[0143] In summary, the present invention proposes a method for an energy storage power consumption side to participate in power grid frequency modulation. The first target power is obtained, and the first target speed is obtained according to the first target power; the first output power is adjusted according to the first target speed so that the first actual speed is the same as the first target speed for secondary frequency modulation; the target power grid frequency is obtained, and it is judged whether to perform primary frequency modulation in combination with the first judgment condition. This not only improves the stability and reliability of the power grid, but also makes full use of the advantages of compressed air energy storage technology, providing an effective technical solution for coping with the access of renewable energy and power demand fluctuations. Secondary frequency modulation ensures that the system can quickly adjust the power output according to the power grid dispatching instructions by precisely adjusting the compressor speed, maintaining the power supply and demand balance of the power grid. Primary frequency modulation can quickly respond when the power grid frequency changes instantaneously by quickly adjusting the intake valve opening, helping to stabilize the power grid frequency and prevent excessive frequency fluctuations. Secondary frequency modulation uses a frequency converter to adjust the speed, with high adjustment accuracy and response speed, and can adapt to power demand under different working conditions. Primary frequency modulation realizes fast power adjustment through simple mechanical adjustment (intake valve opening), which is suitable for emergency frequency modulation requirements within a short time, improving the flexibility and response ability of the system. Secondary frequency modulation avoids unnecessary energy waste by precisely controlling the compressor speed, improving the energy efficiency of the system. Primary frequency modulation reduces the system loss caused by frequency fluctuations by quickly adjusting the intake air flow, further optimizing energy utilization and reducing the operating cost.

[0144] Embodiment 2

[0145] In this embodiment, a system for an energy storage power consumption side to participate in power grid frequency modulation is further provided, including:

[0146] A speed determination module for obtaining the first target power and obtaining the first target speed according to the first target power;

[0147] A secondary frequency modulation module for adjusting the first output power according to the first target speed so that the first actual speed is the same as the first target speed for secondary frequency modulation;

[0148] A primary frequency modulation module for obtaining the target power grid frequency and judging whether to perform primary frequency modulation in combination with the first judgment condition.

[0149] The above-mentioned unit modules can be embedded in the processor of the computer device in hardware form or be independent of it, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above modules.

[0150] This embodiment also provides a computer device, which can be a terminal, and its internal structure diagram can be as Figure 2As shown in the figure. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a carrier network, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements a method for the energy storage side on the power consumption side to participate in power grid frequency modulation. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the computer device housing, or an external keyboard, touchpad, or mouse, etc.

[0151] This embodiment also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0152] Obtain a first target power, and obtain a first target speed according to the first target power;

[0153] Adjust the first output power according to the first target speed so that the first actual speed is the same as the first target speed, and perform secondary frequency modulation;

[0154] Obtain the target grid frequency, and determine whether to perform primary frequency modulation in combination with a first judgment condition.

[0155] Embodiment 3

[0156] In a preferred embodiment, the following specific steps can be designed:

[0157] 1. Receive a dispatching instruction: Receive the target power P from the power grid dispatching center target ;

[0158] 2. Calculate the target speed: Based on the compressor characteristic curve, calculate the speed N required to reach the target power. This process can be completed by looking up a pre-stored power-speed mapping table or using a mathematical model. Assume that the relationship between the power P and the speed N of the compressor can be expressed by the following formula:

[0159] P = kN 3

[0160] where k is a constant, depending on the design parameters of the compressor. Therefore, in order to reach the target power P target , the target speed N targetIt can be calculated by the following formula:

[0161]

[0162] 3. Adjust the output of the frequency converter: According to the calculated target speed N target , adjust the output frequency f of the frequency converter so that the actual speed of the compressor approaches the target speed. The relationship between the output frequency f of the frequency converter and the speed N of the compressor can be approximated as a linear relationship:

[0163] N = c·f

[0164] where c is the proportionality coefficient. Therefore, in order to achieve N target , the output frequency f of the frequency converter output should be adjusted to:

[0165]

[0166] In a preferred embodiment, assume that the power of the compressor in a certain compressed air energy storage system under standard operating conditions is P 0 = 1000kW, and the corresponding speed is N 0 = 3000rpm. When receiving a new dispatching instruction to increase the power to P target = 1200kW, calculate the target speed according to the above formula:

[0167]

[0168] For primary frequency modulation, if it is detected that the grid frequency drops from the standard value of 50Hz to 49.9Hz, the frequency deviation is -0.1Hz, and the known proportionality factor K p = 0.5deg / Hz, then the intake valve opening needs to be adjusted:

[0169] Δθ = 0.5×(-0.1) = -0.05deg

[0170] Adjust the intake valve: According to the calculated Δθ value, adjust the position of the intake valve to reduce the air flow into the compressor, thereby changing the power output of the compressor and helping to stabilize the grid frequency.

[0171] It should be noted that secondary frequency modulation ensures that the system can quickly adjust the power output according to the grid dispatching instruction by precisely adjusting the compressor speed, maintaining the power balance between supply and demand of the grid. Primary frequency modulation can quickly respond when the grid frequency changes instantaneously by quickly adjusting the intake valve opening, helping to stabilize the grid frequency and preventing excessive frequency fluctuations.

[0172] It should be noted that secondary frequency modulation uses a frequency converter to adjust the speed, which has high adjustment accuracy and response speed and can adapt to the power requirements under different working conditions. Primary frequency modulation realizes rapid power adjustment through simple mechanical adjustment (intake valve opening), which is suitable for emergency frequency modulation requirements in a short period of time and improves the flexibility and response ability of the system.

[0173] It should also be noted that secondary frequency modulation avoids unnecessary energy waste by precisely controlling the compressor speed and improves the energy efficiency of the system. Primary frequency modulation reduces the system losses caused by frequency fluctuations by quickly adjusting the intake air flow, further optimizing the energy utilization and reducing the operating cost.

[0174] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

[0175] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can be implemented in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can be implemented in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present application can be implemented in various computer languages. For example, object-oriented programming languages such as Java and interpreted scripting languages such as JavaScript.

[0176] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0177] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means that implement the function specified in one or more of the blocks and / or steps of the flowchart. Figure 1 in one or more of the blocks Figure 1 and / or steps of the flowchart.

[0178] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the function specified in one or more of the blocks and / or steps of the flowchart. Figure 1 in one or more of the blocks Figure 1 and / or steps of the flowchart.

[0179] Although the preferred embodiments of the present application have been described, additional changes and modifications can be made by those skilled in the art once they learn of the basic inventive concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0180] It is apparent that those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. A method for energy storage power consumption side to participate in power grid frequency modulation, characterized in that: include: Acquire a first target power, and acquire a first target speed according to the first target power; Adjusting the first output power according to the first target speed so that the first actual speed is the same as the first target speed, and performing secondary frequency modulation; At the same time, the target grid frequency is obtained, and combined with the first judgment condition, it is determined whether to perform a frequency modulation.

2. The method for energy storage power consumption side to participate in grid frequency modulation as claimed in claim 1, characterized in that: The obtaining of the first target power, and obtaining of the first target speed according to the first target power comprises: Presetting a first mapping model; The first mapping model is any model that has a first target power as input and a first target speed as output or can directly or indirectly obtain the first target speed; A first target rotation speed is acquired according to the first mapping model.

3. The method for energy storage power consumption side to participate in grid frequency modulation as claimed in claim 2, characterized in that: The first judgment condition includes: Presetting a first deviation threshold; Calculating a frequency deviation value according to the target grid frequency and the standard frequency; The frequency deviation value is compared to the first deviation threshold.

4. The method for energy storage power consumption side to participate in grid frequency modulation as claimed in claim 3, characterized in that: The step of obtaining the target grid frequency and determining whether to perform a frequency modulation in combination with the first judgment condition includes: If the frequency deviation value is not greater than the first deviation threshold, no frequency modulation is performed at this time; If the frequency deviation value is greater than the first deviation threshold, a frequency modulation is performed at this time, and a corresponding frequency modulation is performed by establishing a mapping relationship between the first intake valve opening and the frequency deviation value.

5. The method for energy storage power consumption side to participate in grid frequency modulation as claimed in claim 4, characterized in that: The energy storage power consumption side at least includes a compressor, a frequency converter, a high-pressure storage tank, an air intake valve, a control unit, a detection device and a safety protection device; After the first target power is obtained, a first target speed of the compressor is obtained according to the first target power; The first output power of the inverter is adjusted according to the first target speed so that the first actual speed of the compressor is the same as the first target speed.

6. The method for energy storage power consumption side to participate in grid frequency modulation as claimed in claim 5, characterized in that: The step of performing a corresponding frequency modulation by establishing a mapping relationship between the first intake valve opening and the frequency deviation value comprises: The mapping relationship is an arbitrary mapping relationship for determining the first intake valve opening of the intake valve by the frequency deviation value; The mapping relationship includes determining the mapping relationship by using a preset scale factor.

7. The method for energy storage power consumption side to participate in grid frequency modulation as claimed in claim 6, characterized in that: The using a preset scaling factor to determine the mapping relationship comprises: Collecting the operating data of the compressor, including at least different speeds, air intake flow and power output parameters; Analyze the historical frequency change data of the power grid and determine the frequency regulation requirements under different frequency deviations; Taking into account the response characteristics of the compressor and the frequency regulation requirements of the power grid, the value of the proportional factor is optimized through experiments and simulations; The optimized proportional factor is stored in the control unit and is used to calculate the adjustment amount of the intake valve in real time.

8. A system for energy storage and electricity consumption side to participate in grid frequency regulation, characterized in that: include: a rotation speed determination module, configured to obtain a first target power, and obtain a first target rotation speed according to the first target power; a secondary frequency modulation module, configured to adjust the first output power according to the first target speed so that the first actual speed is the same as the first target speed, and perform secondary frequency modulation; The primary frequency modulation module is used to obtain the target grid frequency and determine whether to perform primary frequency modulation in combination with the first judgment condition.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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