Power control method, control processing unit and power supply system

Abstract

The application discloses a power control method, a control processing unit and a power supply system. The power control method comprises the following steps: determining an initial request power according to a ratio of a to-be-allocated power and a to-be-allocated number and a rated power of a first target power supply; determining a target request power according to the initial request power, a missing power and missing powers of non-first target power supplies; setting the first target power supply as an allocated power supply, updating the to-be-allocated power according to a difference between the to-be-allocated power and a request power of the first target power supply and a sum of the missing power of the first target power supply, and updating the to-be-allocated number according to a difference between the to-be-allocated number and 1; until all power supplies are allocated power supplies; and controlling the power outputs of the power supplies according to the target request powers of the power supplies. In this way, the total request power can be reasonably and efficiently allocated to the power supplies, so that the reliability, efficiency and practicability of the power supply system are improved.

Description

Technical Field

[0001] This application relates to the field of power control technology, and in particular to a power control method, a control processing unit, and a power supply system. Background Technology

[0002] In distributed energy systems, multi-source power supply architectures are widely used to improve system reliability and energy harvesting efficiency. A typical scenario is a photovoltaic-storage system with multiple photovoltaic modules as inputs. In such systems, the upper-level energy management unit (such as the energy management system, EMS) typically generates a total power request command based on load demand, energy storage status, or scheduling strategy, and requires the underlying multiple power sources to collaboratively provide that power.

[0003] However, the actual output capability of each power supply has significant time-varying and uncertainties. Taking multi-channel photovoltaic modules as an example, due to factors such as installation orientation, partial shading, light intensity, and temperature differences, the maximum output power (i.e., available power) of each channel changes dynamically during operation, and there may even be situations where a channel has no output at all. At the same time, the total power requested by the upper layer also fluctuates in real time with the application scenario. For example, the system may only require a low power of 100W, or it may request a high power of over 800W.

[0004] Against this backdrop, how to rationally and efficiently distribute the total requested power to each power supply has become a key issue that the system control needs to address. Summary of the Invention

[0005] This application provides a power control method, a control processing unit, and a power supply system that can reasonably and efficiently distribute the total requested power to each power supply, thereby improving the reliability, efficiency, and practicality of the power supply system.

[0006] In a first aspect, embodiments of this application provide a power control method applied to a power supply system. The power supply system includes multiple power sources. The power control method includes: receiving a total requested power and a total number of power sources, wherein the total requested power is the total power to be output by the multiple power sources; when the total requested power is less than the sum of the rated power of each power source, performing the following steps: setting each power source among the multiple power sources as a power source to be allocated, setting the total requested power as the power to be allocated, and setting the total number as the number of power sources to be allocated; determining the initial requested power of the first target power source based on the ratio of the power to be allocated to the number of power sources to be allocated and the rated power of the first target power source, wherein the first target power source is any one of the power sources to be allocated; determining the missing power of the first target power source based on the difference between the initial requested power and the actual power of the first target power source, wherein when each power source is not driven and outputs power, each power source... The missing power of the power supply is 0; based on the initial requested power of the first target power supply, the missing power of the first target power supply, and the missing power of each non-first target power supply, the target requested power of the first target power supply is determined, wherein the non-first target power supplies are the power supplies to be allocated other than the first target power supply; the first target power supply is set as an allocated power supply, and the power to be allocated is updated according to the sum of the difference between the power to be allocated and the requested power of the first target power supply and the missing power of the first target power supply, and the number of power supplies to be allocated is updated according to the difference between the number of power supplies to be allocated and 1; the execution returns to the step of determining the initial requested power of the first target power supply based on the ratio of the power to be allocated to the number of power supplies to be allocated and the rated power of the first target power supply and its subsequent steps, until each power supply is an allocated power supply, so as to obtain the target requested power of each power supply; based on the target requested power of each power supply, the output power of each power supply is controlled.

[0007] In one or more embodiments, determining the initial requested power of the first target power source based on the ratio of the power to be allocated to the number of power sources to be allocated and the rated power of the first target power source includes: when the ratio is greater than K times the rated power, determining the initial requested power of the first target power source based on the ratio, wherein 0.5 ≤ K ≤ 1.

[0008] In one or more embodiments, determining the initial requested power of the first target power source based on the ratio of the power to be allocated to the number of power sources to be allocated and the rated power of the first target power source includes: when the ratio is less than or equal to K times the rated power, performing the following steps: when the power to be allocated is less than or equal to K times the rated power, determining the initial requested power of the first target power source based on the power to be allocated, wherein 0.5 ≤ K ≤ 1; when the power to be allocated is greater than K times the rated power, determining the initial requested power of the first target power source based on K times the rated power.

[0009] In one or more embodiments, determining the target requested power of the first target power source based on the initial requested power of the first target power source, the missing power of the first target power source, and the missing power of each non-first target power source includes: when the missing power of the first target power source is zero and the sum of the missing power of each non-first target power source is not zero, determining the target requested power of the first target power source based on the sum of the average value of the initial requested power of the first target power source and the missing power of each non-first target power source.

[0010] In one or more embodiments, determining the target requested power of the first target power source based on the initial requested power of the first target power source, the missing power of the first target power source, and the missing power of each non-first target power source includes: determining the target requested power of the first target power source based on the initial requested power of the first target power source when the missing power of the first target power source is not zero, and / or the sum of the missing power of each non-first target power source is zero.

[0011] In one or more embodiments, controlling the output power of each power supply includes: if the power adjustment difference corresponding to each power supply is within a first preset range, then keeping the power adjustment difference unchanged, wherein the power adjustment difference is the difference between the current target power and the previous target power of each power supply; if the power adjustment difference is not within the first preset range, then determining the power adjustment difference based on the maximum or minimum value of the first preset range; if the output power of any power supply is greater than the rated power, then controlling the output power of that power supply to be the rated power.

[0012] In one or more embodiments, the power control method further includes: at each first time interval, performing the following steps: setting each of the plurality of power supplies as a power supply to be determined; when the requested power of the second target power supply is greater than the actual power, determining the missing power of the second target power supply based on the difference between the requested power and the actual power, wherein the second target power supply is any one of the power supplies to be determined; if the missing power of the second target power supply is greater than a preset power error for a duration greater than a first preset time, then keeping the missing power of the second target power supply unchanged; if the missing power of the second target power supply is less than or equal to a preset power error for a duration greater than the first preset time, then setting the missing power of the second target power supply to 0; setting the second target power supply as a determined power supply, and returning to the step of determining the missing power of the second target power supply based on the difference between the requested power and the actual power when the requested power of the second target power supply is greater than the actual power, and the subsequent steps, until each power supply is a determined power supply, so as to obtain the missing power of each power supply.

[0013] In a second aspect, embodiments of this application provide a control processing unit, including: at least one processor and a memory; the memory is coupled to the processor and is used to store instructions or programs, which, when executed by at least one processor, cause at least one processor to perform the power control method as described in the first aspect.

[0014] Thirdly, embodiments of this application provide a power supply system, including multiple power supplies and a control processing unit as described in the second aspect, wherein the control processing unit is used to control the output power of each of the multiple power supplies.

[0015] In one or more embodiments, the power supply system is a photovoltaic energy storage system, and the power supply is a photovoltaic module.

[0016] The beneficial effects of this application are as follows: The power control method of this application embodiment is applied to a power supply system, which includes multiple power supplies. The power control method includes: receiving a total requested power and a total number of power supplies, wherein the total requested power is the total power that the multiple power supplies need to output; when the total requested power is less than the sum of the rated power of each power supply, performing the following steps: setting each power supply in the multiple power supplies as a power supply to be allocated, setting the total requested power as the power to be allocated, and setting the total number as the number of power supplies to be allocated; determining the initial requested power of the first target power supply based on the ratio of the power to be allocated to the number of power supplies to be allocated and the rated power of the first target power supply, wherein the first target power supply is any one of the power supplies to be allocated; determining the missing power of the first target power supply based on the initial requested power and the actual power of the first target power supply, wherein when the first target power supply is not driven and outputs power, the first target power supply is not driven and outputs power. The power shortage is 0; the target power demand of the first target power supply is determined based on the initial requested power demand of the first target power supply, the power shortage of the first target power supply, and the power shortage of each non-first target power supply, wherein the non-first target power supplies are the power supplies to be allocated other than the first target power supply; the first target power supply is set as an allocated power supply, and the power to be allocated is updated based on the sum of the difference between the power to be allocated and the requested power demand of the first target power supply and the power shortage of the first target power supply, and the number of power supplies to be allocated is updated based on the difference between the number of power supplies to be allocated and 1; the process returns to the step of determining the initial requested power demand of the first target power supply based on the ratio of the power to be allocated and the rated power demand of the first target power supply, and the subsequent steps, until each power supply is an allocated power supply, so as to obtain the target power demand of each power supply; the output power of each power supply is controlled according to the target power demand of each power supply. The above method enables the allocation of total requested power based on the ratio of the power to be allocated to the number of power sources (i.e., the average value) and the missing power of each power source. This allows for the reasonable and efficient allocation of total requested power to each power source, which is beneficial to improving the reliability, efficiency, and practicality of the power supply system. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are not intended to limit the embodiments, and elements having the same reference numerals in the drawings are designated as similar elements.

[0018] Figure 1 This is a schematic diagram of the power supply system provided in the embodiments of this application;

[0019] Figure 2 This is a flowchart of the power control method provided in the embodiments of this application. Figure 1 ;

[0020] Figure 3 This is a flowchart of the power control method provided in the embodiments of this application. Figure 2 ;

[0021] Figure 4 This is a flowchart of the power control method provided in the embodiments of this application. Figure 3 ;

[0022] Figure 5 This is a flowchart of the power control method provided in the embodiments of this application. Figure 4 ;

[0023] Figure 6 This is a flowchart of the power control method provided in the embodiments of this application. Figure 5 . Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described clearly and in detail below with reference to the accompanying drawings. Obviously, the embodiments in this application are only some embodiments, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0025] It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements between them.

[0026] Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0027] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the power supply system provided in an embodiment of this application. Figure 1 As shown, the power supply system 100 includes multiple power supplies and a control processing unit 110.

[0028] The multiple power sources include a first power source V1, a second power source V2, ..., an Nth power source VN, where N is an integer greater than 1. A power source refers to a source that provides electrical energy to electronic equipment, electrical systems, or electrical appliances. In some embodiments, the power supply system 100 is a photovoltaic energy storage system, and the power source is a photovoltaic module. A photovoltaic module, also known as a solar panel, is a device that directly converts sunlight into electrical energy.

[0029] The control processing unit 110 is used to control the output power of each of the multiple power supplies. The control processing unit 110 can be a microcontroller unit (MCU) or a digital signal processing (DSP) controller, etc.

[0030] The control processing unit 110 includes at least one processor 111 and a memory 112. The memory 112 can be built into the control processing unit 110 or external to the control processing unit 110. The memory 112 can also be a remotely configured memory connected to the control processing unit 110 via a network.

[0031] Memory 112, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. Memory 112 may include a program storage area and a data storage area, wherein the program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal, etc. Furthermore, memory 112 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 112 may optionally include memory remotely located relative to processor 111, and these remote memories can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0032] The processor 111 performs various functions of the terminal and processes data by running or executing software programs and / or modules stored in the memory 112 and calling data stored in the memory 112, thereby performing overall monitoring of the terminal, such as implementing the power control method described in any embodiment of this application.

[0033] Processor 111 can be one or more, Figure 1The example provided is a processor 111. The processor 111 and memory 112 can be connected via a bus or other means. The processor 111 may include a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a controller, a field-programmable gate array (FPGA) device, etc. The processor 111 can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration.

[0034] Please refer to Figure 2 , Figure 2 A flowchart illustrating the power control method provided in an embodiment of this application. Figure 2 As shown, this power control method is applied to a power supply system, which includes multiple power sources. The power supply system can be controlled via, for example... Figure 1 The block diagram shown is implemented as described in detail in the above embodiments, and will not be repeated here. Figure 2 As shown, the power control method includes the following steps S210 to S260.

[0035] Step S210: Receive the total requested power and the total number of power supplies, wherein the total requested power is the total power that the multiple power supplies need to output.

[0036] Specifically, the power supply system receives an externally specified total power request, which represents the total power that all power sources need to output collaboratively. This is under the condition that all power sources are operating normally, when... Greater than hour, Should equal to Among them, Pr i Ps is the rated power of the i-th power supply. i The requested power for the i-th power supply.

[0037] In addition, when the sum of the rated power of each power supply Less than or equal to the total requested power The sum of the output power of each power supply should equal In particular, when the maximum output power of each power supply is equal to its rated power, the sum of the output power of each power supply... Should equal to Among them, Po i Pm represents the output power of the i-th power supply. i Let i be the maximum output power of the i-th power supply, where i is an integer greater than 0 and less than or equal to N.

[0038] Total requested power Less than the sum of the rated power of each power supply. When the time comes, proceed with steps S220 to S270.

[0039] Step S220: Set each of the multiple power supplies as the power supply to be allocated, set the total requested power as the power to be allocated, and set the total number as the number of power supplies to be allocated.

[0040] Specifically, after the power supply system is started (powered on), the following initialization operations are performed: all power supplies are set to the "power supply to be allocated" state, that is, all N power supplies in the power supply system are marked as available units that can participate in power allocation, and no specific output power value has been assigned; the total requested power from external input is set as the power to be allocated, which represents the total amount of power that still needs to be allocated to each power supply; the total number of power supplies is set as the number of power supplies to be allocated, which represents the number of power supplies that can still participate in power allocation.

[0041] Step S230: Determine the initial requested power of the first target power source based on the ratio of the power to be allocated to the number of power sources to be allocated and the rated power of the first target power source, wherein the first target power source is any one of the power sources to be allocated.

[0042] Wherein, the initial requested power of the first target power source is the requested power allocated to the first target power source at this time.

[0043] Specifically, the ratio of the power to be allocated to the number of units to be allocated is the average value, which provides an initial allocation point based on the idea of ​​equal distribution, facilitating subsequent optimization. Combined with the rated power of the first target power source, the initial requested power of the first target power source is determined. This not only ensures safety but also allows for the allocation of the corresponding requested power based on the output capacity of each power source, fully utilizing the energy of each power source, thereby ensuring that the power supply system operates in a safe, balanced, and efficient state.

[0044] In some embodiments, such as Figure 3 As shown, the specific implementation process of step S230 includes the following step S310.

[0045] Step S310: When the ratio of the power to be allocated to the number of units to be allocated is greater than K times the rated power, determine the initial requested power of the first target power source based on the ratio.

[0046] Where 0.5 ≤ K ≤ 1. In a specific embodiment, K = 0.8.

[0047] When the ratio is greater than K times the rated power, it means that the power supply system is under high load, and the first target power source needs to provide more power to meet the load demand. In this case, determining the initial requested power of the first target power source as the ratio of the power to be allocated to the number of units to be allocated not only meets the load demand but also makes full use of the energy of the first target power source to improve efficiency.

[0048] In some embodiments, please continue to refer to Figure 3 The specific implementation process of step S230 also includes the following step S320.

[0049] Step S320: When the ratio is less than or equal to K times the rated power and the power to be allocated is greater than K times the rated power, determine the initial requested power of the first target power source based on K times the rated power.

[0050] A ratio less than or equal to K times the rated power means that, after being evenly distributed according to the total number of power supplies, each power supply needs to meet a lighter load. In this case, if the power to be allocated is greater than K times the rated power, setting the initial requested power of the first target power supply to K times the rated power not only allows the channel to actively undertake more output power, enabling it to operate at a high-efficiency operating point, but also avoids excessive dispersion of the power to be allocated and reduces unnecessary activation of power supplies.

[0051] In some embodiments, please continue to refer to Figure 3 The specific implementation process of step S230 also includes the following step S330.

[0052] Step S330: When the ratio is less than or equal to K times the rated power and the power to be allocated is less than or equal to K times the rated power, determine the initial requested power of the first target power source based on the power to be allocated.

[0053] If the power to be allocated is less than or equal to K times the rated power, it means that the power to be allocated is small and the power supply system is under low load. In this case, the initial requested power of the first target power source is used to determine the power to be allocated, so that the first target power source is directly responsible for all output power. This avoids the efficiency reduction and resource waste caused by activating additional channels, simplifies control, and improves system stability.

[0054] Step S240: Determine the missing power of the first target power source based on the difference between the initial requested power and the actual power of the first target power source. When each power source is not driven and outputs power, the missing power of each power source is 0.

[0055] Specifically, after the power supply system is powered on, the requested power of each power source is first allocated. After the requested power of all power sources is allocated each time, the operation of each power source is controlled according to its requested power, so that each power source outputs power. During the initial allocation of requested power of each power source, before the requested power of all power sources is allocated and the output power of each power source is controlled, each power source does not output power. At this time, the missing power of each power source is recorded as 0.

[0056] In some embodiments, the specific implementation process of step S240 includes the following steps: when the difference between the initial requested power and the actual power of the first target power source is equal to 0, the missing power of the first target power source is 0; when the difference between the initial requested power and the actual power of the first target power source is greater than 0, the missing power of the first target power source is the difference between the initial requested power and the actual power of the first target power source.

[0057] Step S250: Determine the target requested power of the first target power source based on the initial requested power of the first target power source, the missing power of the first target power source, and the missing power of each non-first target power source, wherein the non-first target power sources are the power sources to be allocated other than the first target power source.

[0058] The missing power of any non-first target power source is determined based on the difference between the initial requested power and the actual power of that non-first target power source. Specifically, when the difference between the initial requested power and the actual power of any non-first target power source is equal to 0, the missing power of that non-first target power source is 0; when the difference between the initial requested power and the actual power of any non-first target power source is greater than 0, the missing power of that non-first target power source is the difference between the initial requested power and the actual power of that non-first target power source.

[0059] This embodiment combines the initial requested power and the missing power of each power supply to allocate the total requested power, ensuring that the total requested power is allocated reasonably and efficiently while meeting actual needs. It avoids over-allocation, under-allocation, or forced allocation of power to saturated / limited channels, thereby improving the overall reliability, energy utilization efficiency, and practicality of the power supply system.

[0060] In some embodiments, such as Figure 4 As shown, the specific implementation process of step S250 includes the following step S410.

[0061] Step S410: When the missing power of the first target power source is zero and the sum of the missing power of each non-first target power source is not zero, determine the target requested power of the first target power source based on the sum of the initial requested power of the first target power source and the average value of the missing power of each non-first target power source.

[0062] Wherein, the target requested power of the first target power source is the requested power allocated to the first target power source.

[0063] Specifically, the zero power deficit of the first target power source means that its power generation capacity is sufficient to meet the system's power demand, and there may be surplus energy that is not being utilized. The non-zero sum of the power deficits of the non-first target power sources means that among the non-first target power sources, at least one has insufficient power generation capacity, leading to a local power supply-demand imbalance in the system, thus requiring the first target power source to share some of the requested power.

[0064] At this point, the average value of the missing power of each non-first target power source is first calculated. Where M represents M non-first target power sources, and Pd i Let P be the missing power of the i-th non-first target power source. Next, calculate the initial requested power of the first target power source (denoted as P). st )and The sum of these is the target requested power of the first target power source (denoted as P). tar )for: .

[0065] In this way, the overall power shortage of each non-first target power source is fairly and robustly quantified by the average power shortage of each non-first target power source. When the first target power source does not lack power or even has surplus power, the requested power is shared in coordination based on the above average value, so that the energy of the first target power source can be utilized more fully and rationally, which is conducive to maximizing the overall efficiency and stability of the system.

[0066] In some embodiments, please continue to refer to Figure 4 The specific implementation process of step S250 also includes the following step S420.

[0067] Step S420: When the missing power of the first target power source is not zero, and / or the sum of the missing power of each non-first target power source is zero, determine the target requested power of the first target power source based on the initial requested power of the first target power source.

[0068] The non-zero power deficit of the primary target power source indicates insufficient power generation capacity. The sum of the power deficits of all non-primary target power sources is zero, meaning that the current power generation capacity of these non-primary target power sources is sufficient to meet the system's power requirements, and there may be surplus energy remaining unused. In this case, there is no need to adjust the requested power of the primary target power source; instead, the target requested power of the primary target power source is set as its initial requested power.

[0069] Step S260: Set the first target power supply as the allocated power supply, update the power to be allocated according to the sum of the difference between the power to be allocated and the requested power of the first target power supply and the missing power of the first target power supply, and update the number to be allocated according to the difference between the number to be allocated and 1.

[0070] After step S250 is completed, the requested power of the first target power source has been allocated as the target requested power. At this point, the first target power source is first set as an allocated power source, meaning it is no longer a power source to be allocated, and therefore, the power sources to be allocated do not include the first target power source. Then, the current power to be allocated is subtracted from the requested power of the first target power source, and the missing power of the first target power source is added to obtain the new power to be allocated. Simultaneously, the current number of power sources to be allocated is subtracted by 1, resulting in the new number of power sources to be allocated.

[0071] After determining the new power source to be allocated, the new power to be allocated, and the new number of power sources to be allocated, the process returns to step S230 and its subsequent steps to allocate the requested power to the next power source to be allocated. This continues until all power sources are allocated, at which point each power source is allocated its corresponding requested power, and the requested power allocated to each power source is its target requested power.

[0072] Step S270: Control the output power of each power supply according to the target power demand of each power supply.

[0073] In one specific embodiment, the control processing unit 110 adjusts the actual output power of each power supply according to the target requested power of each power supply through the underlying actuator (such as a DC-DC converter) so that it tracks the corresponding target requested power as closely as possible.

[0074] The implementation process of the power control method of this application is described below with a specific embodiment. In this embodiment, N is 4, that is, the power supply system 100 includes a first power supply, a second power supply, a third power supply, and a fourth power supply. The rated power of the first power supply to the fourth power supply is 500W, K=0.8, and the total requested power is 1500W. The implementation process of the power control method is as follows:

[0075] (1) The first power supply, the second power supply, the third power supply, and the fourth power supply are all power supplies to be allocated. The total requested power is 1500W, the power to be allocated is 1500W, and the number of power supplies to be allocated is 4. The ratio of the power to be allocated to the number of power supplies is 1500 / 4 = 375W. The first power supply is the first target power supply. The rated power of the first target power supply is 500W. 500 × 0.8 = 400W > 375W. Therefore, the initial requested power of the first target power supply is determined to be 400W. Since the power supply is not driven and outputs power at this time, the missing power of each power supply is 0. Therefore, the missing power of the first target power supply is 0. The sum of the missing power of each non-first target power supply (including the second, third, and fourth power supplies) is 0. The target requested power of the first target power supply is the initial requested power of the first target power supply. That is, the target requested power of the first target power supply is 400W.

[0076] The first power supply is set as the allocated power supply, and the power to be allocated is updated to 1500-400+0=1100W, with the number of units to be allocated updated to 4-1=3. The second power supply is set as the first target power supply, and following the above implementation process, the target requested power of the second power supply is 400W. Similarly, the target requested power of the third power supply is 400W, and the target requested power of the fourth power supply is 300W. Based on the target requested power of the first, second, third, and fourth power supplies, the output power of the first, second, third, and fourth power supplies is controlled. The actual output power of the first, second, third, and fourth power supplies is monitored and obtained as 400W, 400W, 300W, and 300W, respectively.

[0077] (2) The first, second, third, and fourth power supplies are all power supplies to be allocated, with a total requested power of 1500W and a power to be allocated of 1500W. The number of power supplies to be allocated is 4. The ratio of the power to be allocated to the number of power supplies is 1500 / 4 = 375W. The first power supply is the first target power supply, and its rated power is 500W. 500 × 0.8 = 400W > 375W, so the initial requested power of the first target power supply is determined to be 400W. The missing power of the first power supply is 400 - 400 = 0, the missing power of the second power supply is 400 - 400 = 0, the missing power of the third power supply is 400 - 300 = 100, and the missing power of the fourth power supply is 300 - 300 = 0. This satisfies the requirement. Figure 4Step S410. The average missing power of each non-first target power source (including the second, third, and fourth power sources) is (0+100+0) / 3≈33. Therefore, the target requested power of the first target power source is 400+33=433W, that is, the target requested power of the first power source is 433W.

[0078] The first power supply is set as the allocated power source. The power to be allocated is updated to 1500 - 433 + 0 = 1067W, and the number of units to be allocated is updated to 4 - 1 = 3. The ratio of the power to be allocated to the number of units is 1067 / 3 ≈ 356W. The second power supply is the first target power supply, with a rated power of 500W. 500 × 0.8 = 400W > 356W, so the initial requested power of the first target power supply is determined to be 400W. The missing power for the first target power supply through the fourth power supply remains 0, 0, 100, and 0 respectively. This satisfies the requirement. Figure 4 Step S410. The average missing power of each non-first target power source (including the third and fourth power sources) is (0+100+0) / 2=50. Therefore, the target requested power of the first target power source is 400+50=450W, that is, the target requested power of the second power source is 450W.

[0079] The second power supply is set as an allocated power supply (at this time, both the first and second power supplies are allocated power supplies, while the third and fourth power supplies are power supplies to be allocated). The power to be allocated is updated to 1067 - 450 + 0 = 617W, and the number of power supplies to be allocated is updated to 3 - 1 = 2. The ratio of the power to be allocated to the number of power supplies is 617 / 2 ≈ 309W. The third power supply is the first target power supply, and the rated power of the first target power supply is 500W. 500 × 0.8 = 400W > 309W, so the initial requested power of the first target power supply is determined to be 400W. The missing power of the first target power supply to the fourth power supply remains 0, 0, 100, and 0, respectively. The sum of the missing power of each non-first target power supply (including the fourth power supply) is 0, satisfying the condition. Figure 4 In step S420, the target power demand of the first target power source is 400W, which means the target power demand of the third power source is also 400W.

[0080] The third power supply is set as an allocated power supply (at this time, the first to third power supplies are all allocated power supplies, and the fourth power supply is a power supply to be allocated). The power to be allocated is updated to 617 - 400 + 100 = 317W (where 100W is the power shortage of the third power supply), and the number of power supplies to be allocated is updated to 2 - 1 = 1. The ratio of the power to be allocated to the number of power supplies to be allocated is 317 / 1 = 317W. The fourth power supply is the first target power supply, and the rated power of the first target power supply is 500W. 500 × 0.8 = 400W > 317W. At this time, since the power to be allocated is less than K times the rated power, the requirement is met. Figure 3 In step S330, the initial requested power of the first target power source is determined to be 317W. The missing power of the first target power source through the fourth power source remains 0, 0, 100, and 0, respectively. Since there are no non-first target power sources at this time, the sum of the missing power of each non-first target power source is 0, satisfying the condition... Figure 4 The step S420 is shown. Therefore, the target power demand of the first target power source is 317W, which means the target power demand of the fourth power source is also 317W.

[0081] Based on the target requested power of the first, second, third, and fourth power supplies (433W, 450W, 400W, and 317W respectively), the output power of these power supplies is controlled. The actual output power of the first, second, third, and fourth power supplies is monitored and obtained as 433W, 450W, 300W, and 317W respectively. The total output power is 433W + 450W + 300W + 317W = 1500W = the total requested power. This satisfies the power demand and achieves power balance.

[0082] As can be seen, in the above process, by allocating the total requested power in real time according to the ratio of the power to be allocated to the number of power sources (i.e., the average value) and the missing power of each power source, the total requested power can be allocated to each power source in a reasonable and efficient manner, thereby improving the reliability, efficiency and practicality of the power supply system.

[0083] In some embodiments, such as Figure 5 As shown, the specific implementation process of controlling the output power of each power supply in step S270 includes the following steps S510 to S530.

[0084] Step S510: If the power adjustment difference corresponding to each power supply is within the first preset range, then keep the power adjustment difference unchanged, wherein the power adjustment difference is the difference between the current target power and the previous target power of each power supply.

[0085] Step S520: If the power adjustment difference is not within the first preset range, then determine the power adjustment difference based on the maximum or minimum value of the first preset range.

[0086] Step S530: If the output power of any power supply is greater than the rated power, then control the output power of that power supply to be the rated power.

[0087] Specifically, during the process of controlling the output power of each power supply, regardless of whether the output power of each power supply increases or decreases, the difference between the current target power and the previous target power (i.e., the power adjustment difference) of each power supply is calculated in real time. Here, the target power of the power supply refers to the expected output power value set for the power supply. This value represents the power level that the power supply is expected to achieve and can be used to guide the adjustment and distribution of actual power.

[0088] If the power adjustment difference falls within a pre-set reasonable range (i.e., the first preset range), it indicates that the power change is stable and controllable. Therefore, the adjustment amount is allowed to continue to be used without intervention. This avoids unnecessary corrections for normal, small power fluctuations, improving system response efficiency and stability.

[0089] If the power adjustment difference of a power supply exceeds the first preset range (e.g., the change is too large and may cause system impact), it is limited to the boundary value: if the power adjustment difference is too large (positive over-limit), it is set to the maximum value of the first preset range; if the power adjustment difference is too small (negative over-limit), it is set to the minimum value of the first preset range. This prevents system instability or equipment overload caused by sudden power changes.

[0090] In addition, after each of the above adjustments, it is necessary to check whether the actual output power of each power supply exceeds its rated power. If it does, its output should be forcibly limited to the rated power value. This protects the safety of the power supply equipment itself, prevents overload, overheating or damage, and ensures that the power supply can operate reliably for a long time.

[0091] In some embodiments, such as Figure 6 As shown, the power control method further includes the following steps: at each first time interval, steps S610 to S660 are executed.

[0092] Step S610: Set each of the multiple power supplies as the power supply to be determined.

[0093] Specifically, in the initial stage of the process, no final decision is made on the missing power of any power supply. Instead, all power supplies are marked as "status not yet determined" and the missing power needs to be determined one by one through subsequent judgment logic and constraints.

[0094] Step S620: When the requested power of the second target power source is greater than the actual power, the missing power of the second target power source is determined based on the difference between the requested power and the actual power of the second target power source, wherein the second target power source is any one of the power sources to be determined.

[0095] Specifically, firstly, any one of the power sources to be determined is designated as the second target power source, that is, an object selected from all the power sources to be determined for the current analysis or control, and this object is denoted as the second target power source. Then, it is determined whether the requested power of the second target power source is greater than the actual power. If so, the difference between the requested power and the actual power of the second target power source is calculated, and this difference is initially taken as the missing power of the second target power source.

[0096] Step S630: If the duration of the missing power of the second target power source being greater than the preset power error is greater than the first preset duration, then the missing power of the second target power source remains unchanged.

[0097] The preset power error is a pre-set power value, which can be set based on the actual application scenario. This application embodiment does not impose specific restrictions on it. The preset power error is used to characterize an allowable power deviation tolerance and to distinguish between "significant deviation" and "acceptable fluctuation".

[0098] The first preset duration is a pre-set duration that can be set based on the actual application scenario; this application embodiment does not impose specific limitations on it. The first preset duration is used to determine whether the deviation state is continuous rather than an instantaneous disturbance.

[0099] Specifically, if the duration of the missing power of the second target power source exceeding the preset power error is longer than the first preset duration, it indicates a significant and persistent deviation, confirming the existence of a real missing power. In this case, maintaining the missing power of the second target power source unchanged facilitates subsequent reallocation of this missing power, ensuring effective resource allocation.

[0100] It is understandable that if the duration for which the missing power of the second target power is greater than the preset power error is less than or equal to the first preset duration, then the missing power of the second target power will remain at the value determined last time (i.e., the missing power of the second target power determined after the last execution of step S660).

[0101] Step S640: If the duration of the missing power of the second target power source is less than or equal to the preset power error, and is greater than the first preset duration, then the missing power of the second target power source is set to 0.

[0102] If the duration of the missing power of the second target power source being less than or equal to the preset power error is greater than the first preset duration, it means that the deviation at this time is small and stable, and can be regarded as a normal deviation. At this time, setting the missing power of the second target power source to 0 indicates that the system has basically stabilized within the allowable error range, thereby preventing frequent adjustments and reducing control oscillations.

[0103] It is understandable that if the duration of the missing power of the second target power source being less than or equal to the preset power error is less than or equal to the first preset duration, then the missing power of the second target power source remains at the value determined last time (i.e., the missing power of the second target power source determined after the last execution of step S660).

[0104] Step S650: Set the second target power supply to the determined power supply.

[0105] After step S640 is completed, the missing power of the second target power source has been determined. At this time, the second target power source can be set as a determined power source, that is, the second target power source is no longer a power source to be determined, that is, the power sources to be determined do not include the second target power source.

[0106] After identifying a new power source to be determined, the new second target power source is any one of the new power sources to be determined. Return to step S620 and its subsequent steps. Continue until all power sources are determined, then proceed to step S660.

[0107] Step S660: Determine the missing power of each power supply.

[0108] Through the above process, the power shortage of each power supply can be determined independently, enabling refined power status management. Secondly, by introducing a dual judgment condition of preset power error and a first preset duration, transient disturbances (such as sudden load changes) can be filtered out to accurately determine the power shortage of each power supply. Furthermore, only continuous and significant power deviations can be considered as true shortages, preventing misjudgments that lead to frequent scheduling. This ensures the system maintains stable operation even in dynamic environments.

[0109] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

[0110] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power control method, characterized in that, The power control method is applied to a power supply system, which includes multiple power sources, and includes: Receive the total requested power and the total number of power supplies, wherein the total requested power is the total power that the multiple power supplies need to output; When the total requested power is less than the sum of the rated power of each power supply, the following steps are performed: Each of the multiple power supplies is set as a power supply to be allocated, the total requested power is set as the power to be allocated, and the total number is set as the number to be allocated. The initial requested power of the first target power source is determined based on the ratio of the power to be allocated to the number of power sources to be allocated and the rated power of the first target power source, wherein the first target power source is any one of the power sources to be allocated. The missing power of the first target power source is determined based on the difference between the initial requested power and the actual power of the first target power source. When each power source is not driven and outputs power, the missing power of each power source is 0. Based on the initial requested power of the first target power source, the missing power of the first target power source, and the missing power of each non-first target power source, the target requested power source of the first target power source is determined, wherein the non-first target power sources are the power sources to be allocated other than the first target power source among the power sources to be allocated. Set the first target power source as an allocated power source, update the power to be allocated based on the sum of the difference between the power to be allocated and the target requested power of the first target power source and the missing power of the first target power source, and update the number of power to be allocated based on the difference between the number of power to be allocated and 1. Return to the execution of the step of determining the initial requested power of the first target power source based on the ratio of the power to be allocated to the number of power sources to be allocated and the rated power of the first target power source, and the subsequent steps, until each power source is an allocated power source, so as to obtain the target requested power of each power source. Control the output power of each power supply according to the target power demand of each power supply.

2. The power control method according to claim 1, characterized in that, The step of determining the initial requested power of the first target power source based on the ratio of the power to be allocated to the number of power sources to be allocated and the rated power of the first target power source includes: When the ratio is greater than K times the rated power, the initial requested power of the first target power source is determined based on the ratio, wherein 0.5 ≤ K ≤ 1.

3. The power control method according to claim 1 or 2, characterized in that, The step of determining the initial requested power of the first target power source based on the ratio of the power to be allocated to the number of power sources to be allocated and the rated power of the first target power source includes: When the ratio is less than or equal to K times the rated power, the following steps are performed: When the power to be allocated is less than or equal to K times the rated power, the initial requested power of the first target power source is determined based on the power to be allocated, wherein 0.5≤K≤1; When the power to be allocated is greater than K times the rated power, the initial requested power of the first target power source is determined based on K times the rated power.

4. The power control method according to claim 1, characterized in that, The step of determining the target requested power of the first target power source based on the initial requested power of the first target power source, the missing power of the first target power source, and the missing power of each non-first target power source includes: When the missing power of the first target power source is zero and the sum of the missing power of each non-first target power source is not zero, the target requested power of the first target power source is determined based on the sum of the initial requested power of the first target power source and the average value of the missing power of each non-first target power source.

5. The power control method according to claim 1 or 4, characterized in that, The step of determining the target requested power of the first target power source based on the initial requested power of the first target power source, the missing power of the first target power source, and the missing power of each non-first target power source includes: When the missing power of the first target power source is not zero, and / or the sum of the missing power of each non-first target power source is zero, the target requested power of the first target power source is determined based on the initial requested power of the first target power source.

6. The power control method according to claim 1, characterized in that, The control of the output power of each power supply includes: If the power adjustment difference corresponding to each power supply is within the first preset range, then the power adjustment difference is kept unchanged, wherein the power adjustment difference is the difference between the current target power and the previous target power of each power supply. If the power adjustment difference is not within the first preset range, then the power adjustment difference is determined according to the maximum or minimum value of the first preset range; If the output power of any power supply is greater than the rated power, then the output power of that power supply will be controlled to the rated power.

7. The power control method according to claim 1, characterized in that, The method further includes: At each first time interval, perform the following steps: Each of the multiple power supplies is set as the power supply to be determined. When the requested power of the second target power source is greater than the actual power, the missing power of the second target power source is determined based on the difference between the requested power and the actual power of the second target power source, wherein the second target power source is any one of the power sources to be determined. If the duration of the missing power of the second target power source being greater than the preset power error is greater than the first preset duration, then the missing power of the second target power source remains unchanged. If the duration of the missing power of the second target power source is less than or equal to the preset power error is greater than the first preset duration, then the missing power of the second target power source is set to 0. Set the second target power source as a determined power source, and return to execute the step of determining the missing power of the second target power source based on the difference between the requested power and the actual power when the requested power of the second target power source is greater than the actual power, and the subsequent steps, until each power source is a determined power source, so as to obtain the missing power of each power source.

8. A control processing unit, characterized in that, include: At least one processor and memory; The memory is coupled to the processor and is used to store instructions or programs that, when executed by the at least one processor, cause the at least one processor to perform the power control method as described in any one of claims 1-7.

9. A power supply system, characterized in that, It includes multiple power supplies and a control processing unit as described in claim 8, wherein the control processing unit is used to control the output power of each of the multiple power supplies.

10. The power supply system according to claim 9, characterized in that, The power supply system is a photovoltaic energy storage system, and the power source is a photovoltaic module.

Images