A method for power distribution of super capacitor and lithium battery for frequency modulation

Abstract

The application relates to a method for energy storage primary frequency modulation power distribution of super capacitors and lithium batteries, and belongs to the technical field of electric power automation. A grid-connected point is taken as a connection point with a power grid as a regulation object of primary frequency modulation; a bus is a grid-connected point, a super capacitor system, a lithium battery system and a load collection point, and the voltage level is 10kV. A primary frequency modulation system collects the current and voltage of the grid-connected point, and realizes real-time calculation of the current amplitude, the voltage amplitude, the frequency and the active power. The real-time active power, the maximum charging and discharging active power, the SOC and the operation state of the lithium battery and the super capacitor are acquired through a GOOSE communication mode, primary frequency modulation power instruction calculation is completed, and the lithium battery and the super capacitor are distributed. The application provides a detailed calculation method for super capacitor preferential distribution under the action of primary frequency modulation, solves the service life problem of the lithium battery under the condition of primary frequency modulation shallow charging and shallow discharging, and fully plays the advantages of the super capacitor, such as fast response and long service life.

Description

TECHNICAL FIELD

[0001] The application relates to a method for super capacitor and lithium battery energy storage primary frequency modulation power distribution, and belongs to the technical field of electric power automation. BACKGROUND

[0002] With the proposal of the "double carbon" goal in China, the new power system mainly based on new energy is developing continuously, the structure of power grid and power source has changed significantly, and the demand for frequency modulation resources of the power system is increasingly urgent. Lithium batteries have the advantages of fast response, strong short-time power throughput, and flexible regulation, and can realize full-power output within milliseconds to seconds. However, when the lithium battery energy storage system is used for grid frequency modulation, it needs to be constantly charged and discharged according to the grid frequency fluctuation, thereby quickly consuming the service life of the lithium battery. The super capacitor has the advantages of high power density, long cycle life, and fast response, and can be used to assist lithium batteries to participate in grid frequency modulation. Under the instruction of small-amplitude grid frequency modulation, the super capacitor energy storage system can be used for frequency modulation, which can avoid the frequent operation of lithium batteries and greatly prolong the service life of lithium batteries. Since the price of super capacitors is much higher than that of lithium batteries, there are relatively few cases of using super capacitors to assist lithium batteries in frequency modulation in engineering. Combining lithium batteries and super capacitors in a certain power capacity ratio to form a hybrid energy storage system can fully utilize the advantages of the two different types of energy storage, and the hybrid energy storage system can be used for frequency modulation, which is a technology with great development potential. Lithium battery and super capacitor hybrid energy storage primary frequency modulation has just started, and only a few demonstration projects have been completed or are under construction. Many principles and technologies still need further research. Therefore, in-depth study of the key technologies of lithium battery and super capacitor hybrid energy storage primary frequency modulation is of great significance for promoting the development of related technologies and the landing of projects.

[0003] Primary frequency modulation refers to the process that when the frequency of the power grid deviates from the rated value, the control system of the unit in the power grid automatically controls the increase and decrease of the active power of the unit, limits the change of the frequency of the power grid, and maintains the stability of the frequency of the power grid.

[0004] The energy storage station uses a corresponding active control system, a single machine or an independent control device to complete the active-frequency droop characteristic control, so that it has the ability to participate in the primary frequency modulation of the grid at the grid connection point. The dispatching master station system takes the frequency at the grid connection point of the energy storage station as the primary frequency modulation control object, and in principle, different grid connection points should establish different primary frequency modulation control objects. The primary frequency modulation active-frequency droop characteristic is realized by setting a frequency and active power broken line function, as shown in Figure 1 That is,

[0005]

[0006] In the formula, f L = 50-fd ;f H = 50 + f d

[0007] f d Primary frequency dead zone, Hz; f N System rated frequency, Hz; p e Primary frequency control object rated capacity, MW; delta% primary frequency regulation difference coefficient; p0 primary frequency control object initial value. SUMMARY

[0008] The purpose of the present application is to provide a solution for the primary frequency power distribution of the hybrid energy storage of supercapacitors and lithium batteries, and to provide a method for the primary frequency power distribution of the energy storage of supercapacitors and lithium batteries.

[0009] The technical solution of the present application is:

[0010] A method for the primary frequency power distribution of the energy storage of supercapacitors and lithium batteries, which is performed according to the following steps:

[0011] Step 1: The grid-connected point is the connection point with the power grid, which is the adjustment object of primary frequency regulation; the bus is the grid-connected point, the supercapacitor, and the lithium battery collection point, and the voltage level is 10 kV;

[0012] The primary frequency system collects the current and voltage of the grid-connected point, and calculates the current amplitude, voltage amplitude, frequency, and active power in real time. The real-time active power, maximum charge and discharge active power, SOC (battery remaining capacity), and operating state of the lithium battery and supercapacitor are obtained through GOOSE (general object-oriented substation event). According to the above information, the primary frequency power distribution is completed by the primary frequency device, and is distributed to the lithium battery and supercapacitor;

[0013] After the primary frequency action, the action instruction is generated, and the current charge and discharge margin of the supercapacitor is judged. When the charge and discharge margin of the supercapacitor meets the primary frequency instruction execution, the supercapacitor is fully distributed; when the charge and discharge margin of the supercapacitor cannot meet the primary frequency instruction execution, the supercapacitor is distributed, and the remaining part is distributed by the lithium battery;

[0014] Step 2: When the discharge margin of the supercapacitor meets the discharge instruction of the primary frequency:

[0015] (1) In the discharge condition, the total discharge regulation amount instruction is obtained:

[0016] Delta P fd = P fd -P fd0

[0017] Wherein, P fd : the total discharge instruction of the PCS calculated by the primary frequency droop curve; Pfd0 : total discharge current value of PCS; ΔP fd : total discharge adjustment amount of PCS;

[0018] (2) In the discharge state, the up-regulation margin of the super capacitor is obtained according to the maximum discharge value of the super capacitor:

[0019] ΔP fdcriydup = P fdcrimax - P fdcri0

[0020] Wherein, P fdcrimax : maximum discharge value of a single super capacitor PCS; P fdcri0 : current discharge value of a single super capacitor PCS; ΔP fdcriydup : up-regulation margin of a single super capacitor PCS;

[0021] (3) In the discharge state, the down-regulation margin of the super capacitor is obtained:

[0022] ΔP fdcriyddn = 0 - P fdcri0

[0023] Wherein, ΔP fdcriyddn : down-regulation margin of a single super capacitor PCS;

[0024] (4) When the discharge margin of the super capacitor meets the discharge instruction of the first frequency modulation, the super capacitor is completely discharged. In order to ensure the balance of SOC control, the dual influence factors of SOC and maximum discharge power are comprehensively considered, and then the adjustment amount of the super capacitor is:

[0025] When up-regulated:

[0026]

[0027] When down-regulated:

[0028]

[0029] Wherein, ΔP fdcri : discharge adjustment amount of a single super capacitor PCS; SOC dncri : SOC down-regulation margin of a single super capacitor PCS, SOC value minus SOC lower limit protection; F: SOC allocation proportion weight factor, default 0.5, the smaller the number, the smaller the SOC influence, the closer to the upper limit proportion allocation, the larger the number, the greater the SOC influence, until completely according to the SOC proportion allocation;

[0030] Step 3: When the discharge margin of the super capacitor does not meet the discharge instruction of the first frequency modulation:

[0031] (1) When the discharge margin of the super capacitor cannot meet the discharge instruction of the first frequency modulation, the super capacitor is called first, and the lithium battery is called second. Under the condition of meeting the SOC margin, the adjustment amount of the super capacitor is the maximum adjustable amount:

[0032] When adjusting upwards:

[0033] ΔP fdcri = ΔP fdcriydup

[0034] When adjusting downwards:

[0035] ΔP fdcri = ΔP fdcriyddn

[0036] (2) The total remaining adjustment amount of the lithium battery to be completed is:

[0037] ΔP fdld = ΔP fd -∑ΔP fdcri

[0038] Wherein, ΔP fdld : the total discharge adjustment amount instruction of the PCS of the lithium battery;

[0039] (3) In the discharge condition, the upward adjustment margin of the lithium battery is obtained according to the maximum discharge value of the lithium battery:

[0040] ΔP fdldiydup = P fdldimax -P fdldi0

[0041] Wherein, P fdldimax : the maximum discharge value of a single lithium battery PCS; P fdldi0 : the current discharge value of a single lithium battery PCS; ΔP fdcriydup : the upward adjustment margin of a single lithium battery PCS;

[0042] (4) In the discharge condition, the downward adjustment margin of the lithium battery is obtained:

[0043] ΔP fdldiyddn = 0-P fdldi0

[0044] Wherein, P fdldi0 : the current discharge value of a single lithium battery PCS; ΔP fdldiyddn : the downward adjustment margin of a single lithium battery PCS;

[0045] (5) In order to ensure the balance of SOC control, the dual influence factors of SOC and maximum discharge power are considered comprehensively, and the adjustment amount of a single lithium battery PCS is:

[0046] When adjusting upwards:

[0047]

[0048] Down-regulation:

[0049]

[0050] Wherein, ΔP fdldi : Discharge adjustment amount of single lithium battery PCS; SOC dnldi : SOC drop margin of single lithium battery PCS, SOC value minus SOC lower limit of protection;

[0051] (6) The actual adjustment instruction of the lithium battery PCS is:

[0052] P fdldi = P fdldi0 + ΔP fdldi

[0053] Wherein, P fdldi : Discharge instruction of single lithium battery PCS,

[0054] Further, the lithium battery system is to convert the lithium battery into AC / DC, and the 10kV / 380V transformer is used for voltage conversion.

[0055] Further, the super capacitor system is to convert the super capacitor into AC / DC, and the 10kV / 380V transformer is used for voltage conversion.

[0056] Further, the primary frequency modulation device is a device for collecting grid point frequency and power, and calculating the power output of the power generation equipment according to the frequency.

[0057] Further, the primary frequency modulation system comprises a primary frequency modulation device, a lithium battery and a super capacitor. The primary frequency modulation system refers to an automatic control system in a power system, which adjusts the power output of the generator set to maintain the fluctuation of the system frequency within the allowed range.

[0058] Further, in the primary frequency modulation power distribution process, the super capacitor is preferentially adjusted, and the lithium battery is adjusted only when the super capacitor power is insufficient.

[0059] After the total active power instruction is calculated according to the active-frequency vertical curve, when there are multiple PCS devices, power distribution is needed, which usually includes average distribution, capacity-based distribution and SOC-based distribution. The distribution mode of the present application simultaneously considers the three influencing factors of capacity, SOC and priority.

[0060] The present application analyzes the discharge condition, and the charging condition is similar.

[0061] The beneficial effects of the present application are:

[0062] The application proposes a system architecture of coordinated control of super capacitor and lithium battery, and analyzes in detail the energy storage coordination control strategy of super capacitor priority, analyzes in detail two cases of the charging and discharging margin of the super capacitor meeting the charging and discharging instruction of primary frequency regulation and the charging and discharging margin of the super capacitor not meeting the charging and discharging instruction of primary frequency regulation, and gives a detailed calculation method of super capacitor priority distribution under primary frequency regulation action, solves the service life problem of lithium battery under the condition of primary frequency regulation shallow charging and discharging, and can fully exert the advantages of super capacitor such as fast response and long service life, and has very important practical significance for guiding the strategy implementation of super capacitor and lithium battery hybrid energy storage primary frequency regulation in actual engineering field. BRIEF DESCRIPTION OF DRAWINGS

[0063] Figure 1 It is a schematic diagram of active-frequency droop characteristic of energy storage station primary frequency regulation.

[0064] Figure 2 It is a schematic diagram of primary frequency regulation device.

[0065] Figure 3 It is a main wiring diagram of super capacitor + lithium battery energy storage.

[0066] Figure 4 It is a primary frequency regulation system structure diagram of super capacitor + lithium battery energy storage. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme in the embodiments of the application will be clearly and completely described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0068] Those skilled in the art will understand that, if a specific technology or condition is not specified in the embodiments, the technology or condition described in the literature in the art or according to the product instruction is used. If the manufacturer of the used instrument is not specified, it is a conventional product that can be obtained by purchase.

[0069] The super capacitor + lithium battery hybrid energy storage primary frequency regulation distribution method of the application will be described below in conjunction with the drawings.

[0070] Step 1: as Figure 3The super capacitor + lithium battery energy storage main wiring diagram is shown, and the grid-connected point is the connection point with the power grid, which can be used as a primary frequency regulation object; the bus is the grid-connected point, the super capacitor system and the lithium battery system collection point, and the voltage level is 10 kV; the lithium battery system is AC / DC conversion of lithium battery, and the 10 kV / 380V transformer is used for voltage conversion; the super capacitor system is AC / DC conversion of super capacitor, and the 10 kV / 380V transformer is used for voltage conversion. The primary frequency regulation system includes a primary frequency regulation device, lithium battery and super capacitor, the primary frequency regulation system collects the current and voltage of the grid-connected point, calculates the current amplitude, voltage amplitude, frequency and active power in real time, and obtains the real-time active power, maximum charge and discharge active power, SOC and operating state of the lithium battery and super capacitor through GOOSE, and according to the above information, the primary frequency regulation device completes the primary frequency regulation power instruction calculation and distributes it to the lithium battery and super capacitor.

[0071] The primary frequency regulation device is a device for collecting the frequency and power of the grid-connected point and calculating the power output of the power generation equipment according to the frequency, as shown in Figure 2 .

[0072] The internal structure includes:

[0073] (1) Power module, the power module is responsible for the power supply of the device, which converts external auxiliary power into internal 5V DC power supply, and the external auxiliary power supports AC220V and DC220V;

[0074] (2) CPU module, the CPU module is responsible for the operation and management of the device, can communicate with LCD (liquid crystal), LED (light emitting diode) and keyboard, and receives time information and manages Ethernet interface.

[0075] (3) DSP module, which collects the voltage and current of the grid-connected point through AD, collects external input quantities, completes the primary frequency regulation calculation of the device, and communicates with PCS through GOOSE to complete instruction distribution.

[0076] After the primary frequency regulation action, the action instruction is generated, which needs to be judged according to the current charge and discharge margin of the super capacitor. When the charge and discharge margin of the super capacitor can meet the primary frequency regulation instruction execution, the super capacitor is used for distribution; when the charge and discharge margin of the super capacitor cannot meet the primary frequency regulation instruction execution, the super capacitor is distributed, and the remaining part is distributed by the lithium battery. The present application analyzes the discharge condition, and the charging condition is similar.

[0077] Step 2: when the discharge margin of the super capacitor meets the discharge instruction of the primary frequency regulation:

[0078] (1) In the discharge condition, the total discharge regulation amount instruction is obtained:

[0079] ΔP fd = Pfd -P fd0

[0080] Wherein, P fd : total discharge instruction of PCS calculated by primary frequency droop curve; P fd0 : current total discharge value of PCS; ΔP fd : total discharge adjustment instruction of PCS;

[0081] (2) In the discharge condition, the up-regulation margin of super capacitor is obtained according to the maximum discharge value of super capacitor:

[0082] ΔP fdcriydup = P fdcrimax -P fdcri0

[0083] Wherein, P fdcrimax : maximum discharge value of single super capacitor PCS; P fdcri0 : current discharge value of single super capacitor PCS; ΔP fdcriydup : up-regulation margin of single super capacitor PCS;

[0084] (3) In the discharge condition, the down-regulation margin of super capacitor is obtained:

[0085] ΔP fdcriyddn = 0-P fdcri0

[0086] Wherein, ΔP fdcriyddn : down-regulation margin of single super capacitor PCS;

[0087] (4) When the discharge margin of super capacitor meets the discharge instruction of primary frequency regulation, the super capacitor is completely used for discharge. In order to ensure the balance of SOC control, the adjustment strategy comprehensively considers the double influence factors of SOC and maximum discharge power, and then the adjustment amount of super capacitor is:

[0088] When up-regulated:

[0089]

[0090] When down-regulated:

[0091]

[0092] Wherein, ΔP fdcri : adjustment amount of discharge of single super capacitor PCS; SOC dncri: The SOC margin of a single super capacitor PCS, the SOC value minus the SOC lower limit of protection; F: SOC allocation proportion weight factor, default 0.5, the smaller the number, the smaller the SOC impact, the closer to the upper limit of proportional allocation, the larger the number, the greater the SOC impact, until the SOC is allocated according to the proportion.

[0093] Step 3: When the discharge margin of the super capacitor does not meet the discharge instruction of the first frequency modulation:

[0094] (1) When the discharge margin of the super capacitor cannot meet the discharge instruction of the first frequency modulation, the super capacitor is preferentially called, and then the lithium battery is called. In the case of meeting the SOC margin, the adjustment amount of the super capacitor is the maximum adjustable amount:

[0095] When adjusting upwards:

[0096] ΔP fdcri = ΔP fdcriydup

[0097] When adjusting downwards:

[0098] ΔP fdcri = ΔP fdcriyddn

[0099] (2) The total remaining adjustment amount of the lithium battery to be completed is:

[0100] ΔP fdld = ΔP fd -∑ΔP fdcri

[0101] Wherein, ΔP fdld : The total discharge adjustment amount instruction of the PCS of the lithium battery;

[0102] (3) In the discharge condition, the upward adjustment margin of the lithium battery is obtained according to the maximum discharge value of the lithium battery:

[0103] ΔP fdldiydup = P fdldimax -P fdldi0

[0104] Wherein, P fdldimax : The maximum discharge value of a single lithium battery PCS; P fdldi0 : The current discharge value of a single lithium battery PCS; ΔP fdcriydup : The upward adjustment margin of a single lithium battery PCS.

[0105] (4) In the discharge condition, the downward adjustment margin of the lithium battery is obtained:

[0106] ΔP fdldiyddn = 0-P fdldi0

[0107] Wherein, P fdldi0: the current discharge value of the single lithium battery PCS; ΔP fdldiyddn : the discharge down-regulation margin of the single lithium battery PCS;

[0108] (5) In order to ensure the balance of SOC control, the adjustment strategy comprehensively considers the dual influence factors of SOC and maximum discharge power, and the adjustment amount of the single lithium battery PCS is:

[0109] When up-regulated:

[0110]

[0111] When down-regulated:

[0112]

[0113] Wherein, ΔP fdldi : the discharge adjustment amount of the single lithium battery PCS; SOC dnldi : the SOC down-regulation margin of the single lithium battery PCS, SOC value minus the SOC lower limit for protection;

[0114] (6) The actual adjustment instruction of the lithium battery PCS is:

[0115] P fdldi = P fdldi0 + ΔP fdldi

[0116] Wherein, P fdldi : the discharge instruction of the single lithium battery PCS.

[0117] The above-described primary frequency modulation system controls the active power of the power generation equipment according to the frequency change of the grid-connected point. The energy storage is a kind of power generation equipment, and the energy storage converts the direct current in the battery into alternating current by means of the PCS, and can also convert the alternating current into direct current of the battery, so as to realize the charging and discharging of the power generation equipment. When the number of PCSs exceeds one, power distribution needs to be performed according to a certain distribution strategy. The power distribution application of the single lithium battery primary frequency modulation is already very mature, and the present application is the power distribution of the hybrid energy storage (lithium battery + super capacitor) considering the capacity, SOC and priority at the same time.

[0118] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-described embodiments, and the above-described embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for energy storage primary frequency modulation power distribution of super capacitor and lithium battery, characterized in that: The following steps are taken: Step 1: The grid-connected point is the connection point with the power grid, serving as the adjustment object for primary frequency regulation; the bus is the grid-connected point, super capacitor, and lithium battery collection point, with a voltage level of 10kV; The primary frequency regulation system collects the grid-connected point current and voltage, calculates the current amplitude, voltage amplitude, frequency, and active power in real time, and obtains the real-time active power, maximum charge and discharge active power, SOC, and operating state of the lithium battery and super capacitor through GOOSE. Based on the above information, the primary frequency regulation device completes the primary frequency regulation power distribution to the lithium battery and super capacitor; the primary frequency regulation system includes a primary frequency regulation device, lithium battery, and super capacitor; After the primary frequency regulation action, an action instruction is generated, and the current charge and discharge margin of the super capacitor is judged. When the charge and discharge margin of the super capacitor meets the primary frequency regulation instruction execution, the super capacitor is fully used for distribution; when the charge and discharge margin of the super capacitor cannot meet the primary frequency regulation instruction execution, the super capacitor is distributed, and the remaining part is distributed by the lithium battery. Step 2: When the discharge margin of the super capacitor meets the discharge instruction of the primary frequency regulation: (1) In the discharge condition, the total discharge adjustment instruction is obtained: ΔP fd = P fd - P fd0 P = P + ΔP fd : total discharge command of the PCS calculated by the primary frequency droop curve; P fd0 : current value of the total discharge of the PCS; ΔP fd : total discharge adjustment amount command of the PCS; (2) In the discharge condition, the up-regulation margin of the super capacitor is obtained based on the maximum discharge value of the super capacitor: ΔP fdcriydup = P fdcrimax - P fdcri0 Pmax: the maximum discharge value of the single super capacitor PCS fdcrimax Pcur: the current discharge value of the single super capacitor PCS fdcri0 ΔP: the up-regulation margin of the single super capacitor PCS fdcriydup Pmax: the maximum discharge value of the single super capacitor PCS (3) In the discharge condition, the down-regulation margin of the super capacitor is obtained: ΔP fdcriyddn = 0 - P fdcri0 wherein ΔP fdcriyddn : discharge down-regulation margin of a single super capacitor PCS (4) When the discharge margin of the super capacitor meets the discharge instruction of the primary frequency regulation, the super capacitor is completely discharged. In order to ensure the balance of SOC control, the dual influence factors of SOC and maximum discharge power are considered, and the adjustment amount of the super capacitor is: Up-regulation: Down-regulation: wherein ΔP fdcri : discharge adjustment amount of a single super capacitor PCS; SOC dncri : SOC drop margin of a single super capacitor PCS, SOC value minus SOC lower limit of protection; F: SOC allocation proportion weight factor, default 0.5, the smaller the number, the smaller the SOC impact, the closer to the upper limit of proportion allocation, the larger the number, the greater the SOC impact, until complete allocation according to the SOC proportion; Step 3: When the discharge margin of the super capacitor does not meet the discharge instruction of the primary frequency regulation: (1) When the discharge margin of the super capacitor cannot meet the discharge instruction of the primary frequency regulation, the super capacitor is called first, and then the lithium battery is called. Under the condition of meeting the SOC margin, the adjustment amount of the super capacitor is the maximum adjustable amount: Up-regulation: ΔP fdcri = ΔP fdcriydup Down-regulation: ΔP fdcri = ΔP fdcriyddn (2) The remaining total adjustment amount of the lithium battery is: ΔP fdld = ΔP fd -∑ΔP fdcri ΔP fdld : total discharge adjustment amount command of the PCS of the lithium battery (3) In the discharge condition, the up-regulation margin of the lithium battery is obtained based on the maximum discharge value of the lithium battery: ΔP fdldiydup = P fdldimax - P fdldi0 Among them, P fdldimax : Maximum discharge value of a single lithium battery PCS; P fdldi0 : Current discharge value of a single lithium battery PCS; ΔP fdcriydup : Discharge increase margin of a single lithium battery PCS; (4) In the discharge condition, the down-regulation margin of the lithium battery is obtained: ΔP fdldiyddn = 0 - P fdldi0 P = P + ΔP fdldi0 : current discharge value of single lithium battery PCS; ΔP fdldiyddn : discharge down-regulation margin of single lithium battery PCS (5) In order to ensure the balance of SOC control, the dual influence factors of SOC and maximum discharge power are considered, and the PCS adjustment amount of a single lithium battery is: Up-regulation: Down-regulation: wherein ΔP fdldi : discharge adjustment amount of a single lithium battery PCS; SOC dnldi : SOC drop margin of a single lithium battery PCS, SOC value minus SOC lower limit of protection; (6) The actual adjustment instruction of the lithium battery PCS is: P fdldi = P fdldi0 + ΔP fdldi P fdldi : Discharge instruction of single lithium battery PCS.

2. The method of supercap and lithium battery energy storage for primary frequency modulation power distribution according to claim 1, characterized in that: The lithium battery system is an AC / DC conversion of the lithium battery, which is boosted or stepped down through a 10kV / 380V transformer.

3. The method of supercap and lithium battery energy storage for primary frequency modulation power distribution according to claim 1, characterized in that: The super capacitor system is an AC / DC conversion of the super capacitor, which is boosted or stepped down through a 10kV / 380V transformer.

4. The method of supercap and lithium battery energy storage for primary frequency modulation power distribution according to claim 1, wherein: The primary frequency regulation device is a device that collects the grid-connected point frequency and power and calculates the power output of the power generation equipment based on the frequency.

5. The method of supercap and lithium battery energy storage for primary frequency modulation power distribution according to claim 1, wherein: In the primary frequency regulation power distribution process, the super capacitor is adjusted first, and the lithium battery is adjusted when the super capacitor power is insufficient.

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