Hybrid energy storage system power distribution method and device and computer equipment

Abstract

The invention provides a hybrid energy storage system power distribution method and device and computer equipment, and relates to the technical field of hybrid energy storage system power distribution. The method comprises the following steps: performing primary distribution on the total power of the hybrid energy storage system at the current moment by using a filter to obtain pre-distributed power of a lithium battery and a super capacitor; performing secondary distribution on the pre-distributed power; performing power amplitude limiting on the lithium battery and super capacitor power obtained after secondary distribution; the secondary distribution at least comprises a first type of secondary distribution, and the first type of secondary distribution is a power distribution mode for actively adjusting the SOC of the super capacitor through an additional power adjustment value. According to the method, SOC adjustment is actively carried out, the directivity is high, the SOC range of the super capacitor is fully utilized, the SOC of the super capacitor is prevented from falling into a dead zone, the service life of the hybrid energy storage system is effectively prolonged, and the performance advantages of the super capacitor are fully played.

Description

Technical Field

[0001] The present application belongs to the technical field of power distribution control of hybrid energy storage systems, and specifically relates to a power distribution method for a hybrid energy storage system, a power distribution device for a hybrid energy storage system, a computer device, and a machine-readable storage medium. Background Art

[0002] The lithium battery-supercapacitor hybrid energy storage system combines the high energy density of lithium batteries with the high power density and long life of supercapacitors, and can provide fast response and long-term energy storage support in the power system. The basic principle is to optimize the utilization of energy and power by combining two energy storage devices. Lithium batteries are suitable for long-term energy supply, while supercapacitors can provide instantaneous high power output. The two can be regarded as energy storage devices that adapt to low-frequency power and high-frequency power, respectively. This combination can improve the overall performance of the system, especially in situations where rapid power regulation is required. In the control strategy of the hybrid energy storage system, the core is to decompose the total power signal into high-frequency and low-frequency power signals in real time and reasonably, and apply them to two different energy storage devices respectively.

[0003] The existing hybrid energy storage system control strategy consists of two parts: power decomposition strategy and energy management strategy. The former is generally based on a high-frequency filter, such as variational mode decomposition, wavelet packet decomposition or Butterworth filter, to obtain the primary decomposed power. The latter corrects the decomposed power according to the current state of charge (SOC) and working status of different energy storage devices, and dynamically updates the filter parameters, so that the system can dynamically adjust the current power allocation strategy under different working conditions.

[0004] However, the use of filters such as variational mode decomposition, wavelet packet decomposition or Butterworth filter for primary power decomposition has low real-time performance and is difficult to apply to frequency modulation strategies with a control cycle of milliseconds. The response speed to frequency modulation instructions is not fast enough. At the same time, in lithium battery-supercapacitor energy storage systems, supercapacitors generally have very small capacity. Existing strategies rely on indirectly controlling the SOC of energy storage devices by adjusting filter parameters, which has poor directivity and easily causes the supercapacitor SOC to fall into a dead zone, that is, near 0 and 1, resulting in loss of regulation ability and failure to maximize the use of the supercapacitor capacity. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a hybrid energy storage system power distribution method, a hybrid energy storage system power distribution device, a computer device and a machine-readable storage medium, so as to overcome at least one of the defects in the prior art, such as poor real-time performance when performing primary power decomposition using filters such as variational mode decomposition, wavelet packet decomposition or Butterworth filter, and the SOC of the energy storage device being easily trapped in a dead zone when indirectly controlling the SOC of the energy storage device by adjusting the filter parameters.

[0006] To achieve the above objectives, the first aspect of the present application provides a hybrid energy storage system power distribution method, comprising: The total power of the hybrid energy storage system at the current moment is obtained by using a filter to perform primary distribution to obtain the pre-allocated power of the lithium battery and supercapacitor; Performing secondary distribution of the pre-allocated power; According to the power limit constraint determined by the SOC of the lithium battery and the supercapacitor, the lithium battery power and the supercapacitor power obtained after the secondary allocation are power limited; Among them, secondary distribution includes at least: the first type of secondary distribution; The first secondary allocation is: adding a power adjustment value to the power currently allocated by the supercapacitor to adjust the SOC of the supercapacitor, and adjusting the currently allocated power of the lithium battery so that the sum of the supercapacitor power after adding the power adjustment value and the adjusted lithium battery power is the total power of the hybrid energy storage system at the current moment.

[0007] In a specific embodiment of the present application, the filter is an exponential moving average filter.

[0008] In a specific embodiment of the present application, if the pre-allocated power of the supercapacitor is opposite to the total power of the hybrid energy storage system at the current moment, the secondary distribution also includes a second secondary distribution, which is before the first secondary distribution. The second secondary distribution is: The pre-allocated power of the supercapacitor is multiplied by a preset adjustment coefficient, and the pre-allocated power of the lithium battery is adjusted so that the sum of the supercapacitor power multiplied by the adjustment coefficient and the adjusted lithium battery power is the total power of the hybrid energy storage system at the current moment; Among them, the value of the adjustment coefficient is greater than or equal to 0 and less than or equal to 1, and the value of the adjustment coefficient is determined based on the comparison result of the frequency regulation income and the increase in the cost per kilowatt-hour of the power grid where the hybrid energy storage system is located. The increase in the cost per kilowatt-hour is the increase in the cost per kilowatt-hour when the pre-allocated power of the supercapacitor is in the opposite direction to the total power of the hybrid energy storage system at the current moment.

[0009] In a specific embodiment of the present application, the value of the adjustment coefficient is determined according to the comparison result of the frequency regulation income and the increase in the cost per kilowatt-hour of the power grid where the hybrid energy storage system is located, including: If the frequency regulation benefit of the power grid where the hybrid energy storage system is located is less than the increase in the cost per kilowatt-hour, the regulation coefficient is 0, otherwise the regulation coefficient is greater than 0.

[0010] In a specific embodiment of the present application, if the total power of the hybrid energy storage system at the current moment is greater than the total power of the hybrid energy storage system at the previous moment, the secondary distribution also includes a third secondary distribution, which is before the first secondary distribution. The third secondary distribution is: Adding a first difference to the pre-allocated power of the supercapacitor, and adjusting the pre-allocated power of the lithium battery, so that the sum of the supercapacitor power to which the first difference is added and the adjusted lithium battery power is the total power of the hybrid energy storage system at the current moment; The first difference is the difference between the total power of the hybrid energy storage system at the current moment and the total power of the hybrid energy storage system at the previous moment.

[0011] In a specific embodiment of the present application, the method further includes: If the increase in the actual power of the supercapacitor monitored at multiple consecutive moments gradually decays, then after the third secondary distribution is performed, power of a first value is transferred from the supercapacitor to the lithium battery, and the power of the first value is the part of the power of the first difference added to the supercapacitor.

[0012] In a specific embodiment of the present application, a power adjustment value is added to the power currently allocated by the supercapacitor to adjust the SOC of the supercapacitor, including: If the average SOC value of the supercapacitor in the first statistical time period is greater than the sum of the supercapacitor SOC target value and the SOC tolerance, a power adjustment value greater than zero is added to the pre-allocated power of the supercapacitor; If the average SOC value of the supercapacitor in the first statistical time period is less than the difference between the supercapacitor SOC target value and the SOC tolerance, a power adjustment value less than zero is added to the pre-allocated power of the supercapacitor; If the average SOC value of the supercapacitor in the first statistical time period is less than or equal to the first sum value and greater than or equal to the second difference value, a power adjustment value less than zero is added to the pre-allocated power of the supercapacitor, the first sum value is the sum of the supercapacitor SOC target value and the SOC tolerance, and the second difference value is the difference between the supercapacitor SOC target value and the SOC tolerance; Wherein, the power adjustment value does not exceed the first threshold value. If the direction of the power adjustment value is opposite to the direction of the total power of the hybrid energy storage system at the current moment, the power adjustment value is set to 0.

[0013] A second aspect of the present application provides a hybrid energy storage system power distribution device, comprising: A primary distribution module is used to perform primary distribution on the total power of the hybrid energy storage system obtained at the current moment by using a filter to obtain the pre-distributed power of the lithium battery and the supercapacitor; A secondary distribution module, used for performing secondary distribution of the pre-distributed power; A power limiting module is used to limit the lithium battery power and the super capacitor power obtained after the secondary distribution according to the power limit constraint determined by the SOC of the lithium battery and the super capacitor; Among them, secondary distribution includes at least: the first type of secondary distribution; The first secondary allocation is: adding a power adjustment value to the power currently allocated by the supercapacitor to adjust the SOC of the supercapacitor, and adjusting the currently allocated power of the lithium battery so that the sum of the supercapacitor power after adding the power adjustment value and the adjusted lithium battery power is the total power of the hybrid energy storage system at the current moment.

[0014] A third aspect of the present application provides a computer device, comprising: a memory configured to store instructions; and The processor is configured to call the instructions from the memory and implement the hybrid energy storage system power distribution method according to the first aspect of the present application when executing the instructions.

[0015] The fourth aspect of the present application provides a machine-readable storage medium, characterized in that the machine-readable storage medium stores instructions, which are used to enable a machine to execute the hybrid energy storage system power allocation method described in the first aspect of the present application.

[0016] In the above technical solution, secondary distribution considering the supercapacitor SOC is performed after primary distribution and before power limiting to actively adjust the SOC, which has strong directionality and makes full use of the SOC range of the supercapacitor to avoid the supercapacitor SOC falling into a dead zone, effectively extending the service life of the energy storage system and giving full play to the performance advantages of the supercapacitor.

[0017] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings: Figure 1 A flow chart of a hybrid energy storage system power distribution method according to an embodiment of the present application is schematically shown; Figure 2 The schematic diagram of power limiting of a hybrid energy storage system in a specific application example is shown schematically; Figure 3 The power decomposition simulation diagram of the hybrid energy storage system in a specific application example is schematically shown; Figure 4 The structural block diagram of a computer device according to an embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0019] The specific implementation of the embodiment of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present application, and is not used to limit the embodiment of the present application.

[0020] If there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0021] Figure 1 The following schematically shows a flow chart of a hybrid energy storage system power distribution method according to an embodiment of the present application. Figure 1 As shown, a hybrid energy storage system power distribution method provided in an embodiment of the present application may include the following steps 102 to 106.

[0022] Step 102: Use a filter to perform primary distribution on the total power of the hybrid energy storage system at the current moment, and obtain the pre-distributed power of the lithium battery and the supercapacitor.

[0023] Step 104: perform secondary allocation on the pre-allocated power.

[0024] Specifically, in this application, secondary distribution includes at least: the first secondary distribution.

[0025] The first secondary allocation is: adding a power adjustment value to the power currently allocated by the supercapacitor to adjust the SOC of the supercapacitor, and adjusting the currently allocated power of the lithium battery so that the sum of the supercapacitor power after adding the power adjustment value and the adjusted lithium battery power is the total power of the hybrid energy storage system at the current moment.

[0026] As an example, a power adjustment value is added to the power currently allocated by the supercapacitor to adjust the SOC of the supercapacitor, including: If the average SOC value of the supercapacitor in the first statistical time period is greater than the sum of the supercapacitor SOC target value and the SOC tolerance, a power adjustment value greater than zero is added to the pre-allocated power of the supercapacitor; If the average SOC value of the supercapacitor in the first statistical time period is less than the difference between the supercapacitor SOC target value and the SOC tolerance, a power adjustment value less than zero is added to the pre-allocated power of the supercapacitor; If the average SOC value of the supercapacitor in the first statistical time period is less than or equal to the first sum value and greater than or equal to the second difference value, a power adjustment value less than zero is added to the pre-allocated power of the supercapacitor, the first sum value is the sum of the supercapacitor SOC target value and the SOC tolerance, and the second difference value is the difference between the supercapacitor SOC target value and the SOC tolerance; The power adjustment value does not exceed the first threshold value. If the direction of the power adjustment value is opposite to the direction of the total power of the hybrid energy storage system at the current moment, the power adjustment value is set to 0.

[0027] Step 106 , according to the power limit constraint determined by the SOC of the lithium battery and the super capacitor, power limiting is performed on the lithium battery power and the super capacitor power obtained after the secondary distribution.

[0028] It can be seen that taking lithium battery power as an example, power limiting means: if the lithium battery power obtained after secondary distribution is greater than the upper limit value of the lithium battery power, then the lithium battery power after limiting is the upper limit value of the lithium battery power; if the lithium battery power obtained after secondary distribution is less than the lower limit value of the lithium battery power, then the lithium battery power after limiting is the lower limit value of the lithium battery power; otherwise, the lithium battery power after limiting remains the lithium battery power obtained after secondary distribution.

[0029] In an improved embodiment of the present application, the filter is an exponential moving average filter (EMA filter).

[0030] As in the above embodiment, because the exponential moving average filter is a real-time filter, the real-time filter occupies less computing resources and responds quickly, and is suitable for high-speed control frequency modulation conditions. By adopting the real-time filter, a combination of fast response and low resource consumption is achieved, which is suitable for frequency modulation strategies with a control period of milliseconds.

[0031] In an improved embodiment of the present application, if the pre-allocated power of the supercapacitor is opposite to the total power of the hybrid energy storage system at the current moment, the secondary distribution also includes a second secondary distribution, which is before the first secondary distribution. The second secondary distribution is: The pre-allocated power of the supercapacitor is multiplied by a preset adjustment coefficient, and the pre-allocated power of the lithium battery is adjusted so that the sum of the supercapacitor power multiplied by the adjustment coefficient and the adjusted lithium battery power is the total power of the hybrid energy storage system at the current moment; Among them, the value of the regulation coefficient is greater than or equal to 0 and less than or equal to 1, and the value of the regulation coefficient is determined based on the comparison result of the frequency regulation income and the increase in the cost per kilowatt-hour of the power grid where the hybrid energy storage system is located. The increase in the cost per kilowatt-hour is the increase in the cost per kilowatt-hour when the pre-allocated power of the supercapacitor is in the opposite direction to the total power of the hybrid energy storage system at the current moment.

[0032] As shown in the above embodiment, the reverse power is actively filtered out through the second secondary distribution, energy transfer is eliminated, and the cost per kilowatt-hour is effectively reduced. This precise power management significantly improves the economy and efficiency of the hybrid energy storage system.

[0033] As an example, the value of the adjustment coefficient is determined according to the comparison result of the frequency regulation benefit and the increase in the cost per kilowatt-hour of the power grid where the hybrid energy storage system is located, including: If the frequency regulation benefit of the power grid where the hybrid energy storage system is located is less than the increase in the cost per kilowatt-hour, the regulation coefficient is 0, otherwise the regulation coefficient is greater than 0.

[0034] In an improved embodiment of the present application, if the total power of the hybrid energy storage system at the current moment is greater than the total power of the hybrid energy storage system at the previous moment, the secondary distribution also includes a third secondary distribution, which is before the first secondary distribution. The third secondary distribution is: Adding the first difference to the pre-allocated power of the supercapacitor, and adjusting the pre-allocated power of the lithium battery, so that the sum of the supercapacitor power added with the first difference and the adjusted lithium battery power is the total power of the hybrid energy storage system at the current moment; The first difference is the difference between the total power of the hybrid energy storage system at the current moment and the total power of the hybrid energy storage system at the previous moment.

[0035] As in the above embodiment, by maximizing the high-frequency power, the number of lithium battery actions is reduced and the total power signal with a lower amplitude is filtered, thereby fully cutting off the lithium battery power and improving the capacity utilization of the supercapacitor.

[0036] In an improved embodiment of the present application, when executing the third secondary distribution, because the capacity of the supercapacitor is usually small, the lithium battery needs to be switched in at an appropriate time. Accordingly, if the increase in the actual power of the supercapacitor monitored at multiple consecutive moments gradually decays, then after the third secondary distribution is performed, power of a first value is also transferred from the supercapacitor to the lithium battery, and the power of the first value is the part of the power of the first difference added to the supercapacitor.

[0037] Combination Figures 2 to 3 As shown, in a specific application example of the above embodiment, the power distribution control of the hybrid energy storage system includes five parts, which process the incoming power in sequence, namely: primary power decomposition, reverse power processing, maximizing high-frequency power, additional SOC adjustment power and power limiting, specifically including the following contents: 1) Primary power decomposition: The primary power decomposer is based on a real-time exponential moving average (EMA) filter, which receives the total system power P HESS, decompose it into high-frequency power and low-frequency power. The purpose of the primary power decomposer is to provide a reference value for the secondary power regulation. The decomposition result is obtained by the following formula:

[0038]

[0039]

[0040] ; in, P HESS is the total power of the hybrid energy storage system at the current moment, P bat0 is the primary power of lithium battery, P SC0 is the primary power of the supercapacitor, α is the filtering parameter, and the control interval t and cutoff frequency F cutoff The typical value of the latter is generally 0.02Hz. It should be noted that It is not the actual power applied to the lithium battery at the last moment, but the power divided by the EMA filter at the last moment. The solved primary power of lithium battery.

[0041] The primary target power given by this step is recorded as P SC0 and P BAT0 .

[0042] 2) Reverse power handling: The primary target power processed by the EMA filter may be reverse charged. In any case, when the total power P HESS When the absolute value of decreases, the direction of the high-frequency power directly generated by the EMA filter is opposite to the total power. At this time, energy transfer occurs inside the hybrid energy storage system, and the electric energy is transferred from one energy storage device to another, causing unnecessary equipment loss and increasing the cost of electricity. For this reason, reverse power processing is performed: when P SC0 and P HESS On the contrary, P SC0 Multiply by the adjustment factor k , while adjusting P BAT ,ensure P SC and P BAT The sum of remains unchanged. The target power after reverse power processing is recorded as P SC1 andP BAT1 For general working conditions, the adjustment factor k The value can be 0. When the frequency regulation income can cover the electricity cost, it can be increased k The target power after adjustment in this step is recorded as P SC1 and P BAT1 .

[0043] 3) Maximizing high frequency power: EMA filter is a real-time filter. For any signal, high-frequency and low-frequency outputs will start to act synchronously. In order to reduce the number of lithium battery actions and filter the total power signal with a lower amplitude, the step of maximizing high-frequency power is introduced to fully cut off the lithium battery power. Specifically, at any time, if the total power of the hybrid energy storage system at the previous moment is The total power of the hybrid energy storage system at the current moment The direction is opposite, indicating that the power direction has changed, skip this step. Compared with the absolute value of If it rises, adjust P SC , append the added part to P SC At the same time, let the increased ΔP SC Exponential decay, adjusted on this basis P BAT ,ensure P SC and P BAT The sum of remains unchanged. Otherwise, skip this step. The target power after adjustment in this step is recorded as P SC2 and P BAT2 .

[0044] 4) Additional SOC adjustment power: If the power is distributed in isolation, the SOC of the supercapacitor will easily fall into the dead zone and lose the regulation ability. For this reason, a power value is added to the supercapacitor power to adjust its SOC.

[0045] In this step, the following independent variables need to be maintained: P adj : Regulated power attached to the supercapacitor; SOC avg : The average SOC of the supercapacitor in the previous period of time (10-20 seconds); SOC target : Supercapacitor SOC target value; in, SOC target is acquired dynamically; by maintaining SOC target , which can make the supercapacitor work in a relatively sufficient SOC range; when P HESS >0, SOC target Set as the discharge limit SOC in the power limit module; when P HESS <0, SOC target Set to the charging limit SOC in power limit control.

[0046] In this step, you need to set the following parameters: P adj-step : Additional power adjustment step, typical value is: when the control cycle is 5ms, the step size is 0.02% of the maximum power of the supercapacitor; P adj-max : Maximum additional power, the typical value is the maximum power of the supercapacitor; SOC tol : SOC tolerance, also known as SOC tolerance, has a typical value of 5%.

[0047] The process flow for this step is as follows: S1. Determine SOC status: If SOC avg >SOC target +SOC tol , it is marked as SOC is too high and additional power is needed; if SOC avg <SOC target -SOC tol , marked as reducing additional power; if neither is true, marked SOC is within a reasonable range; S2, adjust according to SOC status P adj , that is, add or subtract from its original value P adj-step If the SOC is within a reasonable range, reduce P adj The absolute value of P adj-step ; Among them, ensureP adj Direction and P HESS Same, otherwise set to zero and use P adj-max limit P adj The value of S3. P adj Attach to P SC On this basis, adjust P BAT ,ensure P SC and P BAT The sum remains unchanged.

[0048] The target power after adjustment in this step is recorded as P SC3 and P BAT3 .

[0049] 5) Power Limiting: for P SC3 and P BAT3 , depending on the SOC of the lithium battery and supercapacitor, the final power limit is applied to each.

[0050] As an example, Figure 3 As shown, for each energy storage device (lithium battery or supercapacitor), its power limit parameter is given by four SOC points, representing discharge cut-off SOC, discharge limit SOC, charge limit SOC and charge cut-off SOC, with typical values ​​of 0.1, 0.2, 0.8 and 0.9 respectively.

[0051] Corresponding to the hybrid energy storage system power distribution method of the above embodiment, the embodiment of the present application also provides a hybrid energy storage system power distribution device, specifically comprising: A primary distribution module is used to perform primary distribution on the total power of the hybrid energy storage system obtained at the current moment by using a filter to obtain the pre-distributed power of the lithium battery and the supercapacitor; A secondary distribution module, used for performing secondary distribution of the pre-distributed power; A power limiting module is used to limit the lithium battery power and the super capacitor power obtained after the secondary distribution according to the power limit constraint determined by the SOC of the lithium battery and the super capacitor; Among them, secondary distribution includes at least: the first type of secondary distribution; The first secondary allocation is: adding a power adjustment value to the power currently allocated by the supercapacitor to adjust the SOC of the supercapacitor, and adjusting the currently allocated power of the lithium battery so that the sum of the supercapacitor power after adding the power adjustment value and the adjusted lithium battery power is the total power of the hybrid energy storage system at the current moment.

[0052] As an embodiment of the present application, the power distribution device of the hybrid energy storage system can be implemented as follows: Figure 1 The illustrated embodiments and other related method embodiments.

[0053] The process of each module of the hybrid energy storage system power distribution device provided in the embodiment of the present application realizing its own function can be specifically referred to the aforementioned Figure 1 The description of the illustrated embodiment and other related method embodiments will not be repeated here.

[0054] It should be noted that the information interaction, execution process and other contents between the above modules are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0055] Figure 4 A schematic diagram of a computer device according to an embodiment of the present application is shown. In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 4 As shown. The computer device includes a processor A01, a network interface A02, a display screen A04, an input device A05 and a memory (not shown in the figure) connected through a system bus. Among them, the processor A01 of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory A03 and a non-volatile storage medium A06. The non-volatile storage medium A06 stores an operating system B01 and a computer program B02. The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 in the non-volatile storage medium A06. The network interface A02 of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor A01, a power distribution method for a hybrid energy storage system is implemented. The display screen A04 of the computer device can be a liquid crystal display or an electronic ink display, and the input device A05 of the computer device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse.

[0056] Those skilled in the art will understand that Figure 4The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0057] In one embodiment, the hybrid energy storage system power distribution device provided in the present application can be implemented in the form of a computer program. The computer program can be Figure 4 The computer device shown in the figure is run. The memory of the computer device can store various program modules that constitute the power distribution device of the hybrid energy storage system. The computer program composed of various program modules enables the processor to execute the steps of the power distribution method of the hybrid energy storage system in various embodiments of the present application described in this specification.

[0058] In one embodiment, the present application further provides a machine-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the hybrid energy storage system power allocation method in the above embodiment is implemented.

[0059] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0060] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application 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, CD-ROM, optical storage, etc.) that include computer-usable program codes.

[0061] It should also be noted that the terms "include", "comprising" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A hybrid energy storage system power distribution method, characterized in that: include: The total power of the hybrid energy storage system at the current moment is obtained by using a filter to perform primary distribution to obtain the pre-allocated power of the lithium battery and supercapacitor; Performing secondary distribution of the pre-allocated power; According to the power limit constraint determined by the SOC of the lithium battery and the supercapacitor, the lithium battery power and the supercapacitor power obtained after the secondary allocation are power limited; Among them, secondary distribution includes at least: the first type of secondary distribution; The first secondary allocation is: adding a power adjustment value to the power currently allocated by the supercapacitor to adjust the SOC of the supercapacitor, and adjusting the currently allocated power of the lithium battery so that the sum of the supercapacitor power after adding the power adjustment value and the adjusted lithium battery power is the total power of the hybrid energy storage system at the current moment.

2. The hybrid energy storage system power distribution method according to claim 1, characterized in that: The filter is an exponential moving average filter.

3. The hybrid energy storage system power distribution method according to claim 1, characterized in that: If the pre-allocated power of the supercapacitor is in the opposite direction to the total power of the hybrid energy storage system at the current moment, the secondary allocation also includes a second secondary allocation, which is before the first secondary allocation. The second secondary allocation is: The pre-allocated power of the supercapacitor is multiplied by a preset adjustment coefficient, and the pre-allocated power of the lithium battery is adjusted so that the sum of the supercapacitor power multiplied by the adjustment coefficient and the adjusted lithium battery power is the total power of the hybrid energy storage system at the current moment; Among them, the value of the adjustment coefficient is greater than or equal to 0 and less than or equal to 1, and the value of the adjustment coefficient is determined based on the comparison result of the frequency regulation income and the increase in the cost per kilowatt-hour of the power grid where the hybrid energy storage system is located. The increase in the cost per kilowatt-hour is the increase in the cost per kilowatt-hour when the pre-allocated power of the supercapacitor is in the opposite direction to the total power of the hybrid energy storage system at the current moment.

4. The hybrid energy storage system power distribution method according to claim 3, characterized in that: The value of the adjustment coefficient is determined according to the comparison result of the frequency regulation income and the increase in the cost per kilowatt-hour of the power grid where the hybrid energy storage system is located, including: If the frequency regulation benefit of the power grid where the hybrid energy storage system is located is less than the increase in the cost per kilowatt-hour, the regulation coefficient is 0, otherwise the regulation coefficient is greater than 0.

5. The hybrid energy storage system power distribution method according to claim 1, characterized in that: If the total power of the hybrid energy storage system at the current moment is greater than the total power of the hybrid energy storage system at the previous moment, the secondary distribution also includes a third secondary distribution, which is before the first secondary distribution. The third secondary distribution is: Adding a first difference to the pre-allocated power of the supercapacitor, and adjusting the pre-allocated power of the lithium battery, so that the sum of the supercapacitor power to which the first difference is added and the adjusted lithium battery power is the total power of the hybrid energy storage system at the current moment; The first difference is the difference between the total power of the hybrid energy storage system at the current moment and the total power of the hybrid energy storage system at the previous moment.

6. The hybrid energy storage system power distribution method according to claim 5, characterized in that: Also includes: If the increase in the actual power of the supercapacitor monitored at multiple consecutive moments gradually decays, then after the third secondary distribution is performed, power of a first value is transferred from the supercapacitor to the lithium battery, and the power of the first value is the part of the power of the first difference added to the supercapacitor.

7. The hybrid energy storage system power distribution method according to claim 1, characterized in that: A power adjustment value is added to the power currently allocated by the supercapacitor to adjust the SOC of the supercapacitor, including: If the average SOC value of the supercapacitor in the first statistical time period is greater than the sum of the supercapacitor SOC target value and the SOC tolerance, a power adjustment value greater than zero is added to the pre-allocated power of the supercapacitor; If the average SOC value of the supercapacitor in the first statistical time period is less than the difference between the supercapacitor SOC target value and the SOC tolerance, a power adjustment value less than zero is added to the pre-allocated power of the supercapacitor; If the average SOC value of the supercapacitor in the first statistical time period is less than or equal to the first sum value and greater than or equal to the second difference value, a power adjustment value less than zero is added to the pre-allocated power of the supercapacitor, the first sum value is the sum of the supercapacitor SOC target value and the SOC tolerance, and the second difference value is the difference between the supercapacitor SOC target value and the SOC tolerance; Wherein, the power adjustment value does not exceed the first threshold value. If the direction of the power adjustment value is opposite to the direction of the total power of the hybrid energy storage system at the current moment, the power adjustment value is set to 0.

8. A power distribution device for a hybrid energy storage system, characterized in that: include: A primary distribution module is used to perform primary distribution on the total power of the hybrid energy storage system obtained at the current moment by using a filter to obtain the pre-distributed power of the lithium battery and the supercapacitor; A secondary distribution module, used for performing secondary distribution of the pre-distributed power; A power limiting module is used to limit the lithium battery power and the super capacitor power obtained after the secondary distribution according to the power limit constraint determined by the SOC of the lithium battery and the super capacitor; Among them, secondary distribution includes at least: the first type of secondary distribution; The first secondary allocation is: adding a power adjustment value to the power currently allocated by the supercapacitor to adjust the SOC of the supercapacitor, and adjusting the currently allocated power of the lithium battery so that the sum of the supercapacitor power after adding the power adjustment value and the adjusted lithium battery power is the total power of the hybrid energy storage system at the current moment.

9. A computer device, characterized in that: include: a memory configured to store instructions; as well as A processor is configured to call the instructions from the memory and implement the hybrid energy storage system power distribution method according to any one of claims 1 to 7 when executing the instructions.

10. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores instructions for causing a machine to execute the hybrid energy storage system power distribution method according to any one of claims 1 to 7.

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