Primary frequency modulation energy management method and system for hybrid energy storage system containing lithium manganate battery

Abstract

The invention discloses a primary frequency modulation energy management method and system for a hybrid energy storage system containing a lithium manganate battery, and belongs to the technical field of energy storage, and the method comprises the steps: building a primary frequency modulation model of a multi-type energy storage participation power grid system according to the hybrid energy storage system containing the lithium manganate battery; acquiring power grid frequency change of the hybrid energy storage system containing the lithium manganate battery based on the primary frequency modulation model; when the frequency change of the power grid exceeds a frequency modulation dead zone range, the lithium manganate battery participates in primary frequency modulation of the power grid, and droop control is started; the lithium manganate battery participates in primary frequency modulation of a power grid, and the method comprises the following steps: determining frequency modulation coefficients of equipment according to power grid frequency change and maximum power of the equipment; based on the frequency modulation coefficient, frequency modulation compensation power is calculated according to lithium manganate battery energy storage and flywheel energy storage SOC; and determining lithium manganate battery energy storage, flywheel energy storage and final frequency modulation power of the synchronous unit according to the frequency modulation compensation power. The method can improve the power grid stability.

Description

Technical Field

[0001] The invention provides a primary frequency modulation energy management method and system for a hybrid energy storage system containing lithium manganate batteries, belonging to the technical field of energy storage. Background Art

[0002] As the world pays more and more attention to renewable energy and efficient energy utilization, new energy and energy storage technologies are booming at an unprecedented rate. However, in this process, one problem that cannot be ignored is that most battery energy storage systems are often idle for a long time in actual applications. This underutilization not only greatly limits the performance of the energy storage system, but also leads to high idle costs of resources, seriously affecting the economy and sustainability of the entire energy storage system.

[0003] At present, some technologies have been used to try to improve this problem. For example, some traditional energy management systems try to release energy storage during peak energy demand to balance the grid load through preset scheduling strategies. However, these energy storage systems often lack sufficient flexibility and intelligence, and are difficult to cope with complex and changeable changes in energy supply and demand. In addition, there are some control methods based on simple rules, such as setting fixed charge and discharge thresholds, but these methods often ignore key factors such as energy prices, weather conditions, and user behavior, resulting in low utilization efficiency of energy storage systems.

[0004] In order to meet the above challenges, the industry urgently needs a more advanced and intelligent energy management system. Such an energy storage system should not only have highly integrated information technology and data analysis methods to achieve refined and dynamic management of various links such as energy production, storage, distribution and consumption, but also be able to perceive and analyze the dynamic changes of the energy market in real time, predict future energy demand and price trends, and thus formulate the best energy management strategy.

[0005] Through intelligent scheduling and optimization strategies, the utilization efficiency of battery energy storage systems can be effectively improved and operating costs can be reduced. At the same time, it can also promote the consumption and utilization of new energy, reduce dependence on traditional fossil energy, and lay a solid foundation for building a green and low-carbon energy system. Therefore, the research and development of intelligent energy management systems has become an important topic in the current new energy and energy storage fields, and is of great significance for promoting the transformation and upgrading of the energy industry and sustainable development. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a primary frequency modulation energy management method and system for a hybrid energy storage system containing lithium manganese oxide batteries. The method can improve the stability of the power grid.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: In a first aspect, the present invention provides a primary frequency modulation energy management method for a hybrid energy storage system containing a lithium manganese oxide battery, comprising: A primary frequency regulation model of multi-type energy storage participating in the power grid system is built based on the hybrid energy storage system containing lithium manganese oxide batteries; Obtaining the grid frequency change of the hybrid energy storage system containing lithium manganese oxide batteries based on the primary frequency modulation model; When the grid frequency changes beyond the frequency modulation dead zone, the lithium manganese oxide battery participates in the primary frequency modulation of the grid and starts 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 according to the change of the power grid frequency and the maximum power of each device; based on the frequency regulation coefficient, calculating the frequency regulation compensation power according to the lithium manganese oxide battery energy storage and the flywheel energy storage SOC; determining the final frequency regulation power of the lithium manganese oxide battery energy storage, the flywheel energy storage and the synchronous unit according to the frequency regulation compensation power.

[0008] 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 units, and an energy management system, and the lithium manganese oxide batteries, flywheel energy storage, and synchronous units are all connected to the energy management system.

[0009] As a further improvement of the present invention, the multi-type energy storage includes lithium manganese oxide batteries, supercapacitors, and steam turbines.

[0010] As a further improvement of the present invention, the obtaining of the grid frequency change of the hybrid energy storage system containing lithium manganese oxide batteries based on the primary frequency modulation model includes: When the load of the hybrid energy storage system containing lithium manganese oxide batteries changes, the change is , calculate the grid frequency change based on the change , .

[0011] As a further improvement of the present invention, when the grid frequency changes beyond the frequency modulation dead zone, the lithium manganese oxide battery participates in the primary frequency modulation of the grid, including: If the grid frequency of the hybrid energy storage system containing lithium manganese oxide batteries changes within the dead zone, no frequency modulation will be performed; When the grid frequency changes outside the dead zone , start the following calculation: If the grid frequency changes If the short-term power demand is not met, the starting flywheel energy storage will bear a larger frequency modulation power, and the lithium manganese oxide battery energy storage will bear the frequency modulation power; When the grid frequency changes Calculate the frequency modulation coefficient of each hybrid energy storage system containing lithium manganese oxide batteries; Based on the frequency regulation coefficient of each lithium manganese oxide battery hybrid energy storage system, the lithium manganese oxide battery participates in the primary frequency regulation of the power grid.

[0012] As a further improvement of the present invention, the frequency modulation coefficient of each hybrid energy storage system containing lithium manganese oxide batteries is calculated as follows: Steam Turbine:

[0013] Lithium manganese oxide battery:

[0014] Flywheel energy storage:

[0015] The initial frequency modulation power of each part is .

[0016] As a further improvement of the present invention, the droop control comprises: When the battery capacity is insufficient, the PI controller takes the maximum value of the droop coefficient to restore the energy storage capacity.

[0017] As a further improvement of the present invention, the PI controller performs control by taking the maximum value of the droop coefficient, specifically including: The battery SOC deviation is transmitted to the PI controller, which generates additional charge and discharge currents to limit the SOC of the lithium manganese oxide battery to within the upper and lower thresholds; Based on the SOC and the operation mode of the lithium manganese oxide battery, the SOC and capacity of the lithium manganese oxide battery and flywheel energy storage are respectively input into 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 discharged, and the energy storage frequency modulation power is positive.

[0018] As a further improvement of the present invention, the PI controller performs control by taking the maximum value of the droop coefficient, and further comprises: PI controller receives SOC deviation signal , , thereby generating additional charge and discharge current; and then the corrected frequency modulation power of the supercapacitor and lithium manganese oxide battery are obtained respectively , , the final FM power is the initial FM power minus the corrected FM power.

[0019] In a second aspect, the present invention provides a primary frequency modulation energy management system for a hybrid energy storage system containing a lithium manganese oxide battery, comprising: Building a module for building a primary frequency regulation model of multi-type energy storage participating in the power grid system based on a hybrid energy storage system containing lithium manganese oxide batteries; An acquisition module, used for acquiring a grid frequency change of a hybrid energy storage system containing lithium manganese oxide batteries based on the primary frequency modulation model; The frequency modulation module is used for the lithium manganese oxide battery to participate in the primary frequency modulation of the power grid and start the droop control when the power grid frequency changes beyond the frequency modulation dead zone range; the lithium manganese oxide battery participates in the primary frequency modulation of the power grid, including: determining the frequency modulation coefficient of each device according to the power grid frequency change and the maximum power of each device; based on the frequency modulation coefficient, calculating the frequency modulation compensation power according to the lithium manganese oxide battery energy storage and the flywheel energy storage SOC; determining the final frequency modulation power of the lithium manganese oxide battery energy storage, the flywheel energy storage and the synchronous unit according to the frequency modulation compensation power.

[0020] In a third aspect, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide batteries when executing the computer program.

[0021] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide batteries is implemented.

[0022] In a fifth aspect, the present invention provides a computer program product, which includes computer instructions, and the computer instructions instruct a computer to execute the primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide batteries.

[0023] The beneficial effects of the present invention compared with the prior art are as follows: According to the characteristics of the hybrid energy storage system containing lithium manganese oxide batteries, the present invention builds a primary frequency modulation model in which multiple types of energy storage participate in the power grid system. This model can simulate how different energy storage devices work together to maintain the stability of the power grid frequency when the power grid frequency changes. Based on the primary frequency modulation model, the power grid frequency change of the hybrid energy storage system containing lithium manganese oxide batteries is obtained in real time. This is the basis for realizing the frequency modulation function, because only by accurately monitoring the frequency change can a timely response be made. When the power grid frequency change exceeds the frequency modulation dead zone range (i.e., the preset frequency fluctuation tolerance range), the lithium manganese oxide battery participates in the primary frequency modulation of the power grid and starts the droop control. Droop control is a control strategy that maintains the stability of the power grid frequency by adjusting the output power. According to the power grid frequency change and the maximum power of each device, the frequency modulation coefficient of each device is determined. Then, based on the frequency modulation coefficient and the SOC (state of charge) of the lithium manganese oxide battery energy storage and the flywheel energy storage, the frequency modulation compensation power is calculated. This step is to ensure that each energy storage device can contribute the frequency modulation power according to a predetermined ratio. Finally, the final frequency modulation power of the lithium manganese oxide battery energy storage, the flywheel energy storage and the synchronous unit is determined according to the frequency modulation compensation power. These powers will work together to feed the grid to maintain its frequency stability.

[0024] It has the following advantages: The lithium manganese oxide battery of the present invention has high energy density and power density, can quickly respond to changes in grid frequency, and provide timely frequency modulation support. By accurately calculating the frequency modulation compensation power and the final frequency modulation power, the efficient utilization of energy storage resources can be ensured, and damage to energy storage equipment caused by excessive discharge or charging can be avoided. 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 new energy access. The primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide batteries has significant advantages in improving grid stability, environmental protection and energy saving, and reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the embodiments of the present invention or the drawings of related technical solutions in the prior art are introduced below. It should be understood that the drawings introduced below are only for the convenience of clearly describing 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 work.

[0026] Figure 1 This is a diagram of a hybrid energy storage and primary frequency modulation energy management system for a lithium manganate battery energy storage park of the present invention; Figure 2 Schematic diagram of the revised power calculation method for the hybrid energy storage system of supercapacitors and lithium manganese oxide batteries. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limitations of the present invention. For the step numbers in the following embodiments, they are only provided for the convenience of explanation, and the order between the steps is not limited in any way, and the execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0029] In order to optimize and protect lithium manganese oxide batteries and improve the stability of electric power hybrid energy storage systems containing lithium manganese oxide batteries, the present invention provides a hybrid energy storage system in which flywheel energy storage and lithium manganese oxide battery energy storage complement each other, and proposes a primary frequency modulation energy management method and system for the hybrid energy storage system containing lithium manganese oxide batteries.

[0030] Among them, battery selection: lithium manganese oxide batteries are used as long-term energy storage devices to store excess electricity generated by wind power. Flywheel energy storage: Flywheel energy storage is configured to cope with the challenges of wind energy fluctuations and instability, providing short-term high power output.

[0031] like Figure 1 As shown, the embodiment of the present invention provides a method and system for managing primary frequency modulation energy of a hybrid energy storage in an energy storage park containing lithium manganese oxide batteries, including the following steps: Step 1: Build a primary frequency regulation model of the power grid system with multiple types of energy storage participating based on the hybrid energy storage system containing lithium manganese oxide batteries.

[0032] Specifically, a mathematical model reflecting the dynamic characteristics of the hybrid energy storage system is established to simulate the synergistic effect of multiple types of energy storage (lithium manganese oxide batteries, flywheel energy storage, synchronous units) in primary frequency regulation.

[0033] Primary frequency regulation demand model: Based on the grid frequency deviation (Δ f ) and power shortage (Δ P ), for example, the frequency modulation power demand equation is established: ΔPreq=Ksys⋅Δf Among them, Ksys is the system equivalent adjustment coefficient.

[0034] The multi-type energy storage dynamic model specifically includes: Lithium manganate battery: The first-order inertia link is used to describe its power response characteristics, and the transfer function is: Flywheel energy storage: characterizes its fast charging and discharging capabilities using a second-order model; Synchronous unit: Modeling based on the rotor motion equations, reflecting the inertial response (MS) and damping effect (D).

[0035] Preferably, the hybrid energy storage coordination logic is allocated based on the time scale: flywheel energy storage is responsible for millisecond to second level instantaneous power compensation; lithium manganese oxide batteries are responsible for second to minute level frequency regulation; synchronous units provide steady-state power support above minute level.

[0036] Step 2: Obtain the grid frequency change of the hybrid energy storage system containing lithium manganese oxide batteries .

[0037] Based on the above scheme, the 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 real-time data.

[0038] Furthermore, the frequency data is transmitted to the energy management system (EMS) via optical fiber communication or 5G network.

[0039] Use Kalman filtering or wavelet transform to remove noise and extract the effective frequency deviation signal (Δf). Set the frequency dead zone range (such as ±0.05 Hz) and trigger the frequency modulation action only when |Δf|> dead zone threshold.

[0040] Step 3: When the grid frequency changes beyond the frequency regulation dead zone, the lithium manganese oxide battery participates in the primary frequency regulation of the grid and starts the droop control at the same time.

[0041] 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.

[0042] In the droop control principle, the droop coefficient is defined as the power adjustment corresponding to the unit frequency deviation; the lithium manganese oxide battery quickly releases / absorbs power according to the droop coefficient to suppress frequency fluctuations.

[0043] Furthermore, the flywheel energy storage responds preferentially to high-frequency components, the lithium manganese oxide battery covers the mid-frequency band, and the synchronous unit compensates for the low-frequency components.

[0044] Step 4: Determine the frequency modulation coefficient of each device according to the change of grid frequency and the maximum power of each device.

[0045] Based on the above scheme, the frequency modulation tasks are dynamically allocated according to the equipment characteristics and the frequency deviation amplitude.

[0046] Step 5: Determine the frequency modulation compensation power according to the lithium manganese oxide battery energy storage and the flywheel energy storage SOC.

[0047] Based on the above scheme, the frequency modulation power is dynamically adjusted according to the state of charge (SOC) of the energy storage device to avoid overcharging / over-discharging.

[0048] For example, the SOC safety threshold setting: lithium manganese oxide battery: the SOC limit is set to 20%~90%; flywheel energy storage: the speed corresponding SOC limit is set to 15%~85%.

[0049] Adaptive power correction: When SOC approaches the upper limit, the charging power is reduced; when it approaches the lower limit, the discharging power is reduced.

[0050] Step 6: Calculate the power of frequency compensation based on lithium manganese oxide battery energy storage and flywheel energy storage.

[0051] Based on the above scheme, the frequency modulation coefficient and SOC correction are combined to calculate the actual output of each device. For example, model predictive control can be used to optimize power distribution in a rolling manner to ensure economy and stability.

[0052] For example, the charging and discharging rates of lithium manganese oxide batteries and flywheel energy storage are controlled by inverters; the synchronous units adjust the mechanical power output through speed regulators; the frequency recovery is monitored in real time, and parameters are adjusted in a closed loop.

[0053] Step 7: Calculate the final frequency regulation power of the lithium manganese oxide battery energy storage, flywheel energy storage and synchronous unit.

[0054] This method uses refined modeling, dynamic power allocation and intelligent control to coordinate flywheels, lithium batteries and synchronous generators in layers to cover the full-band frequency modulation needs. Dynamic SOC management is performed by optimizing power allocation in combination with equipment status to extend the energy storage life. Fuzzy control is combined with MPC to improve response speed and accuracy. Efficient primary frequency modulation of the hybrid energy storage system is achieved, which is fast, economical and reliable, and is suitable for the construction needs of new power systems.

[0055] The method of the present invention is described in detail below with reference to specific embodiments: Step 1: Build the hybrid energy storage system based on the parameters of lithium manganese oxide batteries. Figure 1 A hybrid energy storage primary frequency regulation energy management system for a lithium manganese oxide battery energy storage park is shown. K is the regulation coefficient, which refers to the proportional relationship between the change in power frequency and the change in active power; Figure 1 There are several modules in it: Lithium manganese oxide battery: As a long-term energy storage device, it is used to store excess electricity generated by wind power.

[0056] Flywheel energy storage: used to meet the challenges of wind energy fluctuations and instability and provide short-term high power output.

[0057] Synchronous units: provide steady-state power support and maintain grid frequency stability.

[0058] Energy Management System (EMS): responsible for coordinating and controlling the operation of each energy storage device and realizing the primary frequency regulation function.

[0059] Step 2: When the load of the hybrid energy storage system containing lithium manganese oxide batteries changes, the change is , M is the grid inertia time constant; D is the load damping coefficient, and the calculation produces the grid frequency change , .

[0060] Step 3: If the grid frequency of the hybrid energy storage system containing lithium manganese oxide batteries changes within the dead zone, KE=KC=0, and the corrected power , no frequency modulation is performed. When the grid frequency changes outside the dead zone , start the following calculation: If the grid frequency change rate is large, , the short-term power demand is large, so the starting flywheel energy storage is given priority to bear the larger frequency modulation power, and the lithium manganese oxide battery energy storage is given the smaller frequency modulation power.

[0061] When the grid frequency changes When the frequency modulation coefficient of each lithium manganese oxide battery hybrid energy storage system is: For steam turbines:

[0062] For lithium manganese oxide batteries:

[0063] For flywheel energy storage:

[0064] The initial frequency modulation power of each part is .

[0065] The frequency regulation effect is better during short-term disturbances or when the battery is fully charged. However, during long-term load disturbances, the battery capacity quickly reaches its upper and lower limits, affecting the battery life and subsequent frequency regulation requirements.

[0066] Furthermore, the present invention establishes a PI controller to generate a compensation current according to the device SOC, which is used to limit the SOC of the device within the upper and lower thresholds. To solve the above problems, a PI controller is used: if the battery capacity is insufficient, the droop coefficient takes the maximum value to ensure rapid recovery of the energy storage capacity.

[0067] Figure 2 A power calculation system is modified for a hybrid energy storage system of supercapacitors and lithium manganese oxide batteries, in which the SOC deviation is transmitted to a PI controller, which generates additional charge and discharge currents for limiting the SOC of the lithium manganese oxide battery within an upper and lower threshold range.

[0068] Figure 2 Mainly includes power deviation transmission: Battery Deviation: SOC and Target SOC ref The difference between the rated capacity and S C is the rated capacity of the supercapacitor, S E It is the rated capacity of lithium manganese oxide battery.

[0069] PI controller: receives the SOC deviation signal and generates additional charge and discharge current. , The frequency modulation power is corrected for the supercapacitor and the lithium manganese oxide battery respectively, and the final frequency modulation power is the initial frequency modulation power minus the corrected frequency modulation power.

[0070] Based on 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 into 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 discharged, and the energy storage frequency modulation power is positive.

[0071] The second object of the present invention is to provide a primary frequency modulation energy management system for a hybrid energy storage system containing lithium manganese oxide batteries. Based on the primary frequency modulation energy management method for a hybrid energy storage system containing lithium manganese oxide batteries, the system comprises: Building a module for building a primary frequency regulation model of multi-type energy storage participating in the power grid system based on a hybrid energy storage system containing lithium manganese oxide batteries; An acquisition module, used for acquiring a grid frequency change of a hybrid energy storage system containing lithium manganese oxide batteries based on the primary frequency modulation model; The frequency modulation module is used for the lithium manganese oxide battery to participate in the primary frequency modulation of the power grid and start the droop control when the power grid frequency changes beyond the frequency modulation dead zone range; the lithium manganese oxide battery participates in the primary frequency modulation of the power grid, including: determining the frequency modulation coefficient of each device according to the power grid frequency change and the maximum power of each device; based on the frequency modulation coefficient, calculating the frequency modulation compensation power according to the lithium manganese oxide battery energy storage and the flywheel energy storage SOC; determining the final frequency modulation power of the lithium manganese oxide battery energy storage, the flywheel energy storage and the synchronous unit according to the frequency modulation compensation power.

[0072] The third object of the embodiment of the present invention is to provide an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide batteries when executing the computer program. It also includes a communication interface and a bus.

[0073] The fourth object of an embodiment of the present invention is to provide a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the primary frequency modulation energy management method of the above-mentioned lithium manganese oxide battery hybrid energy storage system.

[0074] A fifth objective of an embodiment of the present invention is to provide a computer program product, which includes computer instructions, and the computer instructions instruct a computer to execute the above-mentioned primary frequency modulation energy management method of a hybrid energy storage system containing lithium manganese oxide batteries.

[0075] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0076] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0077] The present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented 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 codes.

[0078] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0079] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does 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 primary frequency modulation energy management method for a hybrid energy storage system containing lithium manganese oxide batteries, characterized in that: include: A primary frequency regulation model of multi-type energy storage participating in the power grid system is built based on the hybrid energy storage system containing lithium manganese oxide batteries; Obtaining the grid frequency change of the hybrid energy storage system containing lithium manganese oxide batteries based on the primary frequency modulation model; When the grid frequency changes beyond the frequency modulation dead zone, the lithium manganese oxide battery participates in the primary frequency modulation of the grid and starts droop control; The lithium manganese oxide battery participates in the primary frequency modulation of the power grid, including: determining the frequency modulation coefficient of each device according to the frequency change of the power grid and the maximum power of each device; Based on the frequency modulation coefficient, the frequency modulation compensation power is calculated according to the SOC of the lithium manganese oxide battery energy storage and the flywheel energy storage; and the final frequency modulation power of the lithium manganese oxide battery energy storage, the flywheel energy storage and the synchronous unit is determined according to the frequency modulation compensation power.

2. The primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide batteries according to claim 1 is characterized in that: The lithium manganese oxide battery hybrid energy storage system comprises a lithium manganese oxide battery, a flywheel energy storage, a synchronous unit, and an energy management system, and the lithium manganese oxide battery, the flywheel energy storage, and the synchronous unit are all connected to the energy management system.

3. The primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide batteries according to claim 1 is characterized in that: The multiple types of energy storage include lithium manganese oxide batteries, super capacitors, and steam turbines.

4. The primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide batteries according to claim 1 is characterized in that: The obtaining of the grid frequency change of the hybrid energy storage system containing lithium manganese oxide batteries based on the primary frequency modulation model includes: When the load of the hybrid energy storage system containing lithium manganese oxide batteries changes, the change is , calculate the grid frequency change based on the change , .

5. The primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide battery according to claim 1 is characterized in that: When the grid frequency changes beyond the frequency modulation dead zone, the lithium manganese oxide battery participates in the primary frequency modulation of the grid, including: If the grid frequency of the hybrid energy storage system containing lithium manganese oxide batteries changes within the dead zone, no frequency modulation will be performed; When the grid frequency changes outside the dead zone , start the following calculation: If the grid frequency changes If the short-term power demand is not met, the starting flywheel energy storage will bear a larger frequency modulation power, and the lithium manganese oxide battery energy storage will bear the frequency modulation power; When the grid frequency changes Calculate the frequency modulation coefficient of each hybrid energy storage system containing lithium manganese oxide batteries; Based on the frequency regulation coefficient of each lithium manganese oxide battery hybrid energy storage system, the lithium manganese oxide battery participates in the primary frequency regulation of the power grid.

6. The primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide battery according to claim 5 is characterized in that: The calculation of the frequency modulation 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 .

7. The primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide batteries according to claim 6 is characterized in that: The droop control comprises: When the battery capacity is insufficient, the PI controller takes the maximum value of the droop coefficient to restore the energy storage capacity.

8. The primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide batteries according to claim 7 is characterized in that: The PI controller performs control by taking the maximum value of the droop coefficient, specifically including: The battery SOC deviation is transmitted to the PI controller, which generates additional charge and discharge currents to limit the SOC of the lithium manganese oxide battery to within the upper and lower thresholds; Based on the SOC and the operation mode of the lithium manganese oxide battery, the SOC and capacity of the lithium manganese oxide battery and flywheel energy storage are respectively input into 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 discharged, and the energy storage frequency modulation power is positive.

9. The primary frequency modulation energy management method of the hybrid energy storage system containing lithium manganese oxide batteries according to claim 7 is characterized in that: The PI controller performs control by taking the maximum value of the droop coefficient, and further comprises: PI controller receives SOC deviation signal , , thereby generating additional charge and discharge current; and then the corrected frequency modulation power of the supercapacitor and lithium manganese oxide battery are obtained respectively , , the final FM power is the initial FM power minus the corrected FM power.

10. A primary frequency modulation energy management system for a hybrid energy storage system containing lithium manganese oxide batteries, characterized in that: include: Building a module for building a primary frequency regulation model of multi-type energy storage participating in the power grid system based on a hybrid energy storage system containing lithium manganese oxide batteries; An acquisition module, used for acquiring a grid frequency change of a hybrid energy storage system containing lithium manganese oxide batteries based on the primary frequency modulation model; The frequency modulation module is used for the lithium manganese oxide battery to participate in the primary frequency modulation of the power grid and start the droop control when the power grid frequency changes beyond the frequency modulation dead zone range; The lithium manganese oxide battery participates in the primary frequency modulation of the power grid, including: determining the frequency modulation coefficient of each device according to the frequency change of the power grid and the maximum power of each device; Based on the frequency modulation coefficient, the frequency modulation compensation power is calculated according to the SOC of the lithium manganese oxide battery energy storage and the flywheel energy storage; and the final frequency modulation power of the lithium manganese oxide battery energy storage, the flywheel energy storage and the synchronous unit is determined according to the frequency modulation compensation power.

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