Method and system for primary frequency regulation energy management of lithium-manganese battery hybrid energy storage system

Abstract

The application discloses a primary frequency modulation energy management method and system for a lithium manganate battery mixed energy storage system, and belongs to the technical field of energy storage. The method comprises the following steps: a primary frequency modulation model of a plurality of types of energy storage participating in a power grid system is established according to the lithium manganate battery mixed energy storage system; the power grid frequency variation of the lithium manganate battery mixed energy storage system is obtained based on the primary frequency modulation model; when the power grid frequency variation exceeds the frequency modulation dead zone range, the lithium manganate battery participates in the primary frequency modulation of the power grid, and the droop control is started; the lithium manganate battery participating in the primary frequency modulation of the power grid comprises the following steps: the frequency modulation coefficients of each device are determined according to the power grid frequency variation and the maximum power of each device; the frequency modulation compensation power is calculated according to the lithium manganate battery energy storage and the flywheel energy storage SOC based on the frequency modulation coefficients; and the final frequency modulation power of the lithium manganate battery energy storage, the flywheel energy storage and the synchronous unit is determined according to the frequency modulation compensation power. The method can improve the stability of the power grid.

Description

Technical Field

[0001] This invention proposes a primary frequency regulation energy management method and system for a hybrid energy storage system containing lithium manganese oxide batteries, belonging to the field of energy storage technology. Background Technology

[0002] With increasing global focus on renewable energy and efficient energy utilization, new energy and energy storage technologies are developing at an unprecedented pace. However, a significant problem in this process is that most battery energy storage systems often face long periods of idle time in practical applications. This underutilization not only severely limits the efficiency of energy storage systems but also leads to high idle resource costs, seriously affecting the economic viability and sustainability of the entire energy storage system.

[0003] Currently, some technologies have been attempted to improve this situation. For example, some traditional energy management systems try to release energy storage during peak energy demand periods to balance grid load through preset scheduling strategies. However, these energy storage systems often lack sufficient flexibility and intelligence, making it difficult to cope with complex and ever-changing energy supply and demand dynamics. Furthermore, there are some control methods based on simple rules, such as setting fixed charging and discharging thresholds, but these methods often ignore key factors such as energy prices, weather conditions, and user behavior, resulting in still low utilization efficiency of energy storage systems.

[0004] To address these challenges, the industry urgently needs a more advanced and intelligent energy management system. Such an energy storage system should not only possess highly integrated information technology and data analysis capabilities to achieve refined and dynamic management of all aspects of energy production, storage, distribution, and consumption, but also be able to sense and analyze dynamic changes in the energy market in real time, predict future energy demand and price trends, and thus formulate optimal energy management strategies.

[0005] Intelligent scheduling and optimization strategies can effectively improve the utilization efficiency of battery energy storage systems and reduce operating costs. Simultaneously, it can promote the absorption and utilization of new energy sources, reduce dependence on traditional fossil fuels, and lay a solid foundation for building a green and low-carbon energy system. Therefore, the development of intelligent energy management systems has become an important issue in the fields of new energy and energy storage, and is of great significance for promoting the transformation and upgrading of the energy industry and sustainable development. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention provides a method and system for primary frequency regulation energy management in a hybrid energy storage system containing lithium manganese oxide batteries. This method can improve grid stability.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] In a first aspect, the present invention provides a primary frequency regulation energy management method for a hybrid energy storage system containing lithium manganese oxide batteries, comprising:

[0009] A model for multiple types of energy storage participating in the primary frequency regulation of the power grid system was built based on a hybrid energy storage system containing lithium manganese oxide batteries.

[0010] The grid frequency variation of the hybrid energy storage system containing lithium manganese oxide batteries is obtained based on the primary frequency regulation model.

[0011] When the change in the power grid frequency exceeds the frequency regulation dead zone, the lithium manganese oxide battery participates in the primary frequency regulation of the power grid and initiates droop control.

[0012] The lithium manganese oxide battery participates in the primary frequency regulation of the power grid, including: determining the frequency regulation coefficient of each device based on the changes in the power grid frequency and the maximum power of each device; calculating the frequency regulation compensation power based on the frequency regulation coefficient and the SOC of the lithium manganese oxide battery energy storage and the flywheel energy storage; and determining the final frequency regulation power of the lithium manganese oxide battery energy storage, the flywheel energy storage, and the synchronous generator based on the frequency regulation compensation power.

[0013] As a further improvement of the present invention, the hybrid energy storage system containing lithium manganese oxide batteries includes lithium manganese oxide batteries, flywheel energy storage, synchronous generators, and an energy management system, wherein the lithium manganese oxide batteries, flywheel energy storage, and synchronous generators are all connected to the energy management system.

[0014] As a further improvement of the present invention, the multiple types of energy storage include lithium manganese oxide batteries, supercapacitors, and steam turbines.

[0015] As a further improvement of the present invention, the step of obtaining the grid frequency change of the hybrid energy storage system containing lithium manganese oxide batteries based on the primary frequency regulation model includes:

[0016] When the load of the hybrid energy storage system containing lithium manganese oxide batteries changes, the change is: Calculate the change in power grid frequency based on the change. , .

[0017] As a further improvement of the present invention, the step of having the lithium manganese oxide battery participate in the primary frequency regulation of the power grid when the grid frequency change exceeds the frequency regulation dead zone range includes:

[0018] If the grid frequency variation of the hybrid energy storage system containing lithium manganese oxide batteries is within the dead zone, frequency regulation is not performed;

[0019] When the power grid frequency change is outside the dead zone Initiate the following calculations:

[0020] If the power grid frequency changes If the short-term power demand is not met, the starting flywheel energy storage will bear a greater frequency regulation power, and the lithium manganese oxide battery energy storage will bear the frequency regulation power.

[0021] When the change in grid frequency is At that time, calculate the frequency regulation coefficient of each hybrid energy storage system containing lithium manganese oxide batteries;

[0022] Based on the frequency regulation coefficients of various hybrid energy storage systems containing lithium manganese oxide batteries, lithium manganese oxide batteries are used to participate in the primary frequency regulation of the power grid.

[0023] As a further improvement to the present invention, the calculation of the frequency regulation coefficient of each lithium manganese oxide battery hybrid energy storage system is specifically as follows:

[0024] Steam turbine:

[0025]

[0026] Lithium manganese oxide battery:

[0027]

[0028] Flywheel energy storage:

[0029]

[0030] The initial frequency modulation power of each part is .

[0031] As a further improvement of the present invention, the droop control includes:

[0032] When the battery capacity is insufficient, the PI controller controls the battery by taking the maximum value of the droop coefficient, thereby restoring the energy storage capacity.

[0033] As a further improvement of the present invention, the PI controller controls the system by taking the maximum value of the droop coefficient, specifically including:

[0034] The battery SOC deviation is passed to the PI controller, which generates additional charge and discharge current to limit the SOC of the lithium manganese oxide battery within the upper and lower threshold ranges.

[0035] Based on the SOC and lithium manganese oxide battery operation mode, the SOC and capacity of the lithium manganese oxide battery and flywheel energy storage are respectively input to the PI controller to generate compensation current to control the SOC of each device. When the SOC is small, the additional power is negative, representing charging; the load change is positive, the energy storage is discharging, and the energy storage frequency regulation power is positive.

[0036] As a further improvement of the present invention, the PI controller, which controls the system by taking the maximum value of the droop coefficient, further includes:

[0037] The PI controller receives the SOC deviation signal. , This generates additional charging and discharging current; the corrected frequency modulation power of the supercapacitor and lithium manganese oxide battery are then obtained. , The final frequency modulation power is the initial frequency modulation power minus the corrected frequency modulation power.

[0038] In a second aspect, the present invention provides a primary frequency regulation energy management system for a hybrid energy storage system containing lithium manganese oxide batteries, comprising:

[0039] A module is built to construct a primary frequency regulation model for multiple types of energy storage to participate in the power grid system based on a hybrid energy storage system containing lithium manganese oxide batteries.

[0040] The acquisition module is used to acquire the grid frequency change of the hybrid energy storage system containing lithium manganese oxide batteries based on the primary frequency regulation model.

[0041] The frequency regulation module is used to enable the lithium manganese oxide battery to participate in the primary frequency regulation of the power grid and initiate droop control when the change in the power grid frequency exceeds the frequency regulation dead zone. The participation of the lithium manganese oxide battery in the primary frequency regulation of the power grid includes: determining the frequency regulation coefficient of each device based on the change in the power grid frequency and the maximum power of each device; calculating the frequency regulation compensation power based on the frequency regulation coefficient and the SOC of the lithium manganese oxide battery energy storage and the flywheel energy storage; and determining the final frequency regulation power of the lithium manganese oxide battery energy storage, the flywheel energy storage, and the synchronous generator based on the frequency regulation compensation power.

[0042] Thirdly, the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the primary frequency regulation energy management method of the lithium manganese oxide battery hybrid energy storage system.

[0043] Fourthly, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the primary frequency regulation energy management method of the lithium manganese oxide battery hybrid energy storage system.

[0044] Fifthly, the present invention provides a computer program product, the computer program product including computer instructions, the computer instructions instructing a computer to execute the primary frequency regulation energy management method of the lithium manganese oxide battery hybrid energy storage system.

[0045] The advantages of this invention over the prior art are as follows:

[0046] This invention, based on the characteristics of a hybrid energy storage system containing lithium manganese oxide batteries, establishes a primary frequency regulation model for multiple types of energy storage participating in the power grid system. This model can simulate how different energy storage devices work collaboratively to maintain grid frequency stability when the grid frequency changes. Based on the primary frequency regulation model, the grid frequency changes of the hybrid energy storage system containing lithium manganese oxide batteries are acquired in real time. This is the foundation for realizing the frequency regulation function, because only by accurately monitoring frequency changes can a timely response be made. When the grid frequency change exceeds the frequency regulation dead zone (i.e., the preset frequency fluctuation tolerance range), the lithium manganese oxide battery participates in the primary frequency regulation of the grid and initiates droop control. Droop control is a control strategy that maintains grid frequency stability by adjusting output power. The frequency regulation coefficient of each device is determined based on the grid frequency change and the maximum power of each device. Then, based on the frequency regulation coefficient and the SOC (state of charge) of the lithium manganese oxide battery energy storage and flywheel energy storage, the frequency regulation compensation power is calculated. This step is to ensure that each energy storage device can contribute frequency regulation power according to a predetermined ratio. Finally, the final frequency regulation power of the lithium manganese oxide battery energy storage, flywheel energy storage, and synchronous generator is determined based on the frequency regulation compensation power. This power will work together to maintain the grid's frequency stability.

[0047] It has the following advantages:

[0048] The lithium manganese oxide battery of this invention has high energy density and power density, enabling rapid response to changes in grid frequency and providing timely frequency regulation support. By accurately calculating the frequency regulation compensation power and the final frequency regulation power, efficient utilization of energy storage resources can be ensured, avoiding damage to energy storage equipment caused by over-discharge or over-charging. The participation of the lithium manganese oxide battery hybrid energy storage system can significantly improve the frequency stability of the power grid. Especially in power grids with a high proportion of renewable energy integration, the primary frequency regulation energy management method of the lithium manganese oxide battery hybrid energy storage system has significant advantages in improving grid stability, environmental protection and energy conservation, and reducing operating costs. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following description is provided with accompanying drawings of the relevant technical solutions in the embodiments of the present invention or the prior art. It should be understood that the accompanying drawings described below are only for the purpose of clearly illustrating some embodiments of the technical solutions of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a diagram of a hybrid energy storage and primary frequency regulation energy management system for a lithium manganese oxide battery energy storage park according to the present invention;

[0051] Figure 2 A schematic diagram of the corrected power calculation method for a hybrid energy storage system of supercapacitors and lithium manganese oxide batteries. Detailed Implementation

[0052] The embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The step numbers in the following embodiments are set only for ease of explanation, and there is no limitation on the order between the steps. The execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0053] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0054] In order to optimize and protect lithium manganese oxide batteries and improve the stability of hybrid energy storage systems containing lithium manganese oxide batteries, this invention provides a hybrid energy storage system that complements flywheel energy storage and lithium manganese oxide battery energy storage, and proposes a primary frequency regulation energy management method and system for this hybrid energy storage system containing lithium manganese oxide batteries.

[0055] Specifically, the battery selection involves using lithium manganese oxide batteries as long-term energy storage devices to store excess electrical energy generated by wind power. Flywheel energy storage is also employed to address the challenges of wind energy fluctuations and instability, providing short-term high-power output.

[0056] like Figure 1 As shown, this embodiment of the invention provides a method and system for primary frequency regulation energy management of hybrid energy storage in lithium manganese oxide battery energy storage parks, including the following steps:

[0057] Step 1: Build a primary frequency regulation model for multiple types of energy storage participating in the power grid system based on the hybrid energy storage system containing lithium manganese oxide batteries.

[0058] Specifically, a mathematical model reflecting the dynamic characteristics of a hybrid energy storage system is established to simulate the synergistic effect of multiple types of energy storage (lithium manganese oxide batteries, flywheel energy storage, and synchronous generators) in primary frequency regulation.

[0059] Primary frequency regulation demand model: based on grid frequency deviation (Δ f ) and power deficit (Δ P The linear relationship between ) can be established, for example, by establishing the frequency modulation power demand equation:

[0060] ΔPreq=Ksys⋅Δf

[0061] Wherein, Ksys is the system equivalent droop coefficient.

[0062] The various types of dynamic energy storage models specifically include:

[0063] Lithium manganese oxide battery: Its power response characteristics are described using a first-order inertial element, and the transfer function is:

[0064] Flywheel energy storage: Its rapid charge and discharge capability is characterized by a second-order model;

[0065] Synchronous generator units: Modeled based on rotor motion equations, reflecting inertial response (MS) and damping effect (D).

[0066] Preferably, the hybrid energy storage coordination logic is based on time scale allocation: flywheel energy storage is responsible for instantaneous power compensation at the millisecond to second level; lithium manganese oxide batteries undertake frequency regulation at the second to minute level; and synchronous units provide steady-state power support at the minute level and above.

[0067] Step 2: Obtain grid frequency changes for the hybrid energy storage system containing lithium manganese oxide batteries .

[0068] Based on the above scheme, the power grid frequency deviation is monitored in real time to provide input signals for frequency regulation control; high-precision frequency sensors (such as PMU, synchronous phasor measurement unit) are deployed with a sampling frequency ≥100 Hz to ensure data real-time performance.

[0069] Furthermore, frequency data is transmitted to the energy management system (EMS) via fiber optic communication or 5G networks.

[0070] Noise is removed using Kalman filtering or wavelet transform to extract the effective frequency deviation signal (Δf). A frequency dead zone range is set (e.g., ±0.05 Hz), and frequency modulation is triggered only when |Δf|> the dead zone threshold.

[0071] Step 3: When the grid frequency change exceeds the frequency regulation dead zone, the lithium manganese oxide battery participates in the primary frequency regulation of the grid and simultaneously initiates droop control.

[0072] Based on the above scheme, the lithium manganese oxide battery is activated when the frequency exceeds the limit, and the frequency modulation power is distributed through droop control.

[0073] In the droop control principle, the droop coefficient is defined as the power adjustment amount corresponding to a unit frequency deviation; the lithium manganese oxide battery quickly releases / absorbs power according to the droop coefficient to suppress frequency fluctuations.

[0074] Furthermore, flywheel energy storage prioritizes high-frequency components, lithium manganese oxide batteries cover the mid-frequency band, and synchronous generators compensate for low-frequency components.

[0075] Step 4: Determine the frequency regulation coefficient of each device based on the changes in the power grid frequency and the maximum power of each device.

[0076] Based on the above scheme, frequency modulation tasks are dynamically allocated according to equipment characteristics and frequency deviation amplitude.

[0077] Step 5: Determine the frequency modulation compensation power based on the lithium manganese oxide battery energy storage and the flywheel energy storage SOC.

[0078] Based on the above scheme, the frequency regulation power is dynamically adjusted according to the state of charge (SOC) of the energy storage device to avoid overcharging / over-discharging.

[0079] For example, SOC safety threshold settings: Lithium manganese oxide batteries: SOC limit set at 20%~90%; Flywheel energy storage: SOC limit set at 15%~85% corresponding to rotational speed.

[0080] Adaptive power correction: When the SOC is close to the upper limit, reduce the charging power; when it is close to the lower limit, reduce the discharging power.

[0081] Step 6: Calculate the frequency regulation compensation power based on the energy storage of lithium manganese oxide battery and flywheel energy storage.

[0082] Based on the above scheme, the actual output of each device is calculated by combining the frequency regulation coefficient and the SOC correction. For example, model predictive control can be used to optimize power allocation and ensure both economy and stability.

[0083] For example, the charging and discharging rates of lithium manganese oxide batteries and flywheel energy storage are controlled by a converter; the mechanical power output of synchronous generators is adjusted by a speed governor; and the frequency recovery is monitored in real time, with parameters adjusted in a closed loop.

[0084] Step 7: Calculate the final frequency regulation power of the lithium manganese oxide battery energy storage, flywheel energy storage, and synchronous generator.

[0085] This method employs refined modeling, dynamic power allocation, and intelligent control, enabling multi-timescale coordination of flywheel, lithium battery, and synchronous generator components to cover frequency regulation needs across the entire frequency band. Dynamic State of Charge (SOC) management, combined with equipment status-optimized power allocation, extends energy storage lifespan. The integration of fuzzy control and MPC enhances response speed and accuracy. This approach achieves highly efficient primary frequency regulation for hybrid energy storage systems, combining speed, economy, and reliability, making it suitable for the construction needs of new power systems.

[0086] The method of the present invention will be described in detail below with reference to specific embodiments:

[0087] Step 1: Build the hybrid energy storage system based on the parameters of the lithium manganese oxide battery, as follows: Figure 1 The diagram illustrates a hybrid energy storage and primary frequency regulation energy management system for a lithium manganese oxide battery-based energy storage park. K is the droop coefficient, which refers to the proportional relationship between changes in power supply frequency and changes in active power.

[0088] Figure 1 It contains the following modules:

[0089] Lithium manganese oxide batteries: used as long-term energy storage devices to store excess electrical energy generated by wind power.

[0090] Flywheel energy storage: designed to address the challenges of wind energy fluctuations and instability, providing short-term high power output.

[0091] Synchronous generating units: provide steady-state power support and maintain grid frequency stability.

[0092] Energy Management System (EMS): Responsible for coordinating and controlling the operation of various energy storage devices to achieve primary frequency regulation.

[0093] Step 2: When the load of the hybrid energy storage system containing lithium manganese oxide batteries changes, the change is: M is the power grid inertia time constant; D is the load damping coefficient, used to calculate the resulting power grid frequency variation. , .

[0094] Step 3; If the grid frequency variation of the hybrid energy storage system containing lithium manganese oxide batteries is within the dead zone, then KE=KC=0, and the correction power... No frequency adjustment is performed. When the grid frequency change is outside the dead zone... Initiate the following calculations:

[0095] If the rate of change of the power grid frequency is large, when When the short-term power demand is large, the starting flywheel energy storage is given priority to undertake the greater frequency regulation power, while the lithium manganese oxide battery energy storage undertakes the smaller frequency regulation power.

[0096] When the change in grid frequency is At that time, the frequency regulation coefficients of each hybrid energy storage system containing lithium manganese oxide batteries are:

[0097] For steam turbines:

[0098]

[0099] For lithium manganese oxide batteries:

[0100]

[0101] For flywheel energy storage:

[0102]

[0103] The initial frequency modulation power of each part is .

[0104] The frequency regulation effect is better when there is short-term disturbance or sufficient power, but under long-term load disturbance, the battery capacity will quickly reach the upper and lower limits, affecting battery life and subsequent frequency regulation requirements.

[0105] Furthermore, this invention establishes a PI controller to generate a compensation current based on the device's State of Charge (SOC), thereby limiting the device's SOC within an upper and lower threshold range. To address the above issues, a PI controller is used: when battery capacity is insufficient, the droop coefficient is set to the maximum value to ensure rapid recovery of energy storage capacity.

[0106] Figure 2 A power calculation system is modified for a hybrid energy storage system of supercapacitors and lithium manganese oxide batteries, in which the state of charge (SOC) deviation is passed to a PI controller, which generates additional charge and discharge current to limit the SOC of the lithium manganese oxide battery within upper and lower threshold ranges.

[0107] Figure 2 This mainly includes the transmission of electrical deviations:

[0108] Battery capacity deviation: SOC vs. target SOC ref The difference between them is multiplied by the rated capacity, where S C It is the rated capacitance of the supercapacitor, S E This is the rated capacity of a lithium manganese oxide battery.

[0109] PI controller: Receives the SOC deviation signal and generates additional charging and discharging current. , The frequency modulation power is adjusted for supercapacitors and lithium manganese oxide batteries respectively, and the final frequency modulation power is the initial frequency modulation power minus the adjusted frequency modulation power.

[0110] The operating mode of the lithium manganese oxide battery is based on SOC and capacity. The SOC and capacity of the lithium manganese oxide battery and flywheel energy storage are respectively input to a PI controller to generate compensation current to control the SOC of each device. When the SOC is low, the additional power is negative, representing charging. Load changes are positive, energy storage is discharging, and the energy storage frequency regulation power is positive.

[0111] The second objective of this invention is to provide a primary frequency regulation energy management system for a hybrid energy storage system containing lithium manganese oxide batteries. Based on the aforementioned primary frequency regulation energy management method for a hybrid energy storage system containing lithium manganese oxide batteries, the system includes:

[0112] A module is built to construct a primary frequency regulation model for multiple types of energy storage to participate in the power grid system based on a hybrid energy storage system containing lithium manganese oxide batteries.

[0113] The acquisition module is used to acquire the grid frequency change of the hybrid energy storage system containing lithium manganese oxide batteries based on the primary frequency regulation model.

[0114] The frequency regulation module is used to enable the lithium manganese oxide battery to participate in the primary frequency regulation of the power grid and initiate droop control when the change in the power grid frequency exceeds the frequency regulation dead zone. The participation of the lithium manganese oxide battery in the primary frequency regulation of the power grid includes: determining the frequency regulation coefficient of each device based on the change in the power grid frequency and the maximum power of each device; calculating the frequency regulation compensation power based on the frequency regulation coefficient and the SOC of the lithium manganese oxide battery energy storage and the flywheel energy storage; and determining the final frequency regulation power of the lithium manganese oxide battery energy storage, the flywheel energy storage, and the synchronous generator based on the frequency regulation compensation power.

[0115] A third objective of this invention is to provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the aforementioned primary frequency regulation energy management method for a hybrid energy storage system containing a lithium manganese oxide battery. The device also includes a communication interface and a bus.

[0116] A fourth objective of this invention is to provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned primary frequency regulation energy management method for a hybrid energy storage system containing lithium manganese oxide batteries.

[0117] A fifth objective of this invention is to provide a computer program product comprising computer instructions that instruct a computer to execute the aforementioned primary frequency regulation energy management method for a hybrid energy storage system containing lithium manganese oxide batteries.

[0118] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0119] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0120] This invention may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, readable storage media, optical storage, etc.) containing computer-usable program code.

[0121] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0122] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for primary frequency regulation energy management of a hybrid energy storage system containing lithium manganese oxide batteries, characterized in that, include: A model for multiple types of energy storage participating in the primary frequency regulation of the power grid system was built based on a hybrid energy storage system containing lithium manganese oxide batteries. The grid frequency variation of the hybrid energy storage system containing lithium manganese oxide batteries is obtained based on the primary frequency regulation model. When the change in the power grid frequency exceeds the frequency regulation dead zone, the lithium manganese oxide battery participates in the primary frequency regulation of the power grid and initiates droop control. The lithium manganese oxide battery participates in the primary frequency regulation of the power grid, including: determining the frequency regulation coefficient of each device based on the changes in the power grid frequency and the maximum power of each device; calculating the frequency regulation compensation power based on the frequency regulation coefficient and the SOC of the lithium manganese oxide battery energy storage and the flywheel energy storage; and determining the final frequency regulation power of the lithium manganese oxide battery energy storage, the flywheel energy storage, and the synchronous generator based on the frequency regulation compensation power. When the grid frequency change exceeds the frequency regulation dead zone, the lithium manganese oxide battery participates in the primary frequency regulation of the grid, including: If the grid frequency variation of the hybrid energy storage system containing lithium manganese oxide batteries is within the dead zone, frequency regulation is not performed; When the power grid frequency change is outside the dead zone Initiate the following calculations: If the power grid frequency changes If the short-term power demand is not met, the starting flywheel energy storage will bear a greater frequency regulation power, and the lithium manganese oxide battery energy storage will bear the frequency regulation power. When the change in grid frequency is At that time, calculate the frequency regulation coefficient of each hybrid energy storage system containing lithium manganese oxide batteries; Based on the frequency regulation coefficients of various hybrid energy storage systems containing lithium manganese oxide batteries, lithium manganese oxide batteries are used to participate in the primary frequency regulation of the power grid. The calculation of the frequency regulation coefficient of each lithium manganese oxide battery hybrid energy storage system is specifically as follows: Steam turbine: Lithium manganese oxide battery: Flywheel energy storage: The initial frequency modulation power of each part is .

2. The primary frequency regulation energy management method for a hybrid energy storage system containing manganese oxide batteries according to claim 1, characterized in that, The hybrid energy storage system containing lithium manganese oxide batteries includes lithium manganese oxide batteries, flywheel energy storage, synchronous generators, and an energy management system. The lithium manganese oxide batteries, flywheel energy storage, and synchronous generators are all connected to the energy management system.

3. The primary frequency regulation energy management method for a hybrid energy storage system containing lithium manganese oxide batteries according to claim 1, characterized in that, The various types of energy storage include lithium manganese oxide batteries, supercapacitors, and steam turbines.

4. The primary frequency regulation energy management method for a hybrid energy storage system containing lithium manganese oxide batteries according to claim 1, characterized in that, The acquisition of grid frequency changes for the hybrid energy storage system containing lithium manganese oxide batteries based on the primary frequency regulation model includes: When the load of the hybrid energy storage system containing lithium manganese oxide batteries changes, the change is: Calculate the change in power grid frequency based on the change. , ; Where M is the power grid inertia time constant; D is the load damping coefficient.

5. The primary frequency regulation energy management method for a lithium manganese oxide battery hybrid energy storage system according to claim 1, characterized in that, The droop control includes: When the battery capacity is insufficient, the PI controller controls the battery by taking the maximum value of the droop coefficient, thereby restoring the energy storage capacity.

6. The primary frequency regulation energy management method for a lithium manganese oxide battery hybrid energy storage system according to claim 5, characterized in that, The PI controller controls the system by taking the maximum value of the droop coefficient, specifically including: The battery SOC deviation is passed to the PI controller, which generates additional charge and discharge current to limit the SOC of the lithium manganese oxide battery within the upper and lower threshold ranges. Based on the SOC and lithium manganese oxide battery operating modes, the SOC and capacity of the lithium manganese oxide battery and flywheel energy storage are respectively input to the PI controller to generate compensation current to control the SOC of each device. When the SOC is small, the additional power is negative, representing charging; the load change is positive, the energy storage is discharging, and the energy storage frequency regulation power is positive.

7. The primary frequency regulation energy management method for a hybrid energy storage system containing lithium manganese oxide batteries according to claim 6, characterized in that, The PI controller controls the system by taking the maximum value of the droop coefficient, and also includes: The PI controller receives the SOC deviation signal. , This generates additional charging and discharging current; the corrected frequency modulation power of the supercapacitor and lithium manganese oxide battery are then obtained. , The final frequency modulation power is the initial frequency modulation power minus the corrected frequency modulation power.

8. A primary frequency regulation energy management system for a lithium manganese oxide battery hybrid energy storage system, used to execute the primary frequency regulation energy management method for a lithium manganese oxide battery hybrid energy storage system according to any one of claims 1 to 7, characterized in that, include: A module is built to construct a primary frequency regulation model for multiple types of energy storage to participate in the power grid system based on a hybrid energy storage system containing lithium manganese oxide batteries. The acquisition module is used to acquire the grid frequency change of the hybrid energy storage system containing lithium manganese oxide batteries based on the primary frequency regulation model. The frequency regulation module is used to enable the lithium manganese oxide battery to participate in the primary frequency regulation of the power grid and initiate droop control when the change in the power grid frequency exceeds the frequency regulation dead zone. The lithium manganese oxide battery participates in the primary frequency regulation of the power grid, including: determining the frequency regulation coefficient of each device based on the changes in the power grid frequency and the maximum power of each device; Based on the frequency regulation coefficient, the frequency regulation compensation power is calculated according to the SOC of the lithium manganese oxide battery energy storage and the flywheel energy storage; the final frequency regulation power of the lithium manganese oxide battery energy storage, the flywheel energy storage, and the synchronous generator is determined according to the frequency regulation compensation power.

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