Power utilization rate maximization tracking method and device, medium and computer equipment

Abstract

The invention provides a power utilization rate maximization tracking method and device, a medium and computer equipment. The power utilization rate maximization tracking method comprises the steps that the corresponding first operation power Pk-1 when a water pump operates at the first operation frequency F1 is calculated; in response to the target instruction voltage U1 corresponding to the maximum power point of the photovoltaic panel and the first operation frequency F1 of the water pump, calculating an actual instruction voltage U2 used for controlling the working frequency of the water pump; based on the actual instruction voltage U2, the operation frequency of the water pump is adjusted, and the second operation frequency F2 of the water pump is obtained; the corresponding second operation power Pk when the water pump operates at the second operation frequency F2 is calculated; the first operation power Pk-1 and the second operation power Pk are compared, and the target instruction voltage U1 is updated according to a preset stepping voltage value based on the comparison result so as to adjust the power of the water pump; according to the technical scheme, the operation frequency of the water pump is dynamically adjusted to be matched with the maximum power point output of the solar photovoltaic panel, and the utilization rate of photovoltaic electric energy is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water pump control, and more specifically, to a method, device, medium and computer equipment for maximizing power utilization rate tracking. Background Art

[0002] The output voltage of the maximum power point of a solar panel is not constant, but varies with environmental conditions (such as light intensity, temperature, etc.). The output power of a solar panel depends on the product of its output voltage and output current. On the volt-ampere characteristic curve of a solar panel, there is a point (maximum power point, MPP) where the output power reaches its maximum value. In some simple solar systems, an approximately fixed voltage value (for example, a value close to the maximum power point voltage) may be used to operate the solar panel.

[0003] Many farmlands, especially in remote areas, lack reliable electricity supply. Traditional diesel-driven water pumps are expensive to operate and pollute the environment. Using photovoltaic power supply, it can operate efficiently during the day, which is highly matched with agricultural water demand (usually concentrated during the day). Grasslands, desertified areas and grazing areas are usually difficult to cover with power grids, and livestock have a strong and continuous demand for water.

[0004] The current variable frequency water pump system usually adopts a fixed frequency or limited adjustment strategy, and cannot adjust its own operating frequency in real time according to the actual output power of the solar photovoltaic panel. This design is difficult to dynamically match the optimal power output point of the photovoltaic panel when the output power of the solar photovoltaic panel fluctuates greatly (such as changes in light intensity, fluctuations in ambient temperature, etc.), resulting in the system being unable to fully utilize the electricity generated by the photovoltaic panel. In addition, since the frequency adjustment of the variable frequency water pump is not effectively combined with the maximum power point tracking (MPPT) strategy of the photovoltaic panel, the overall operating efficiency of the system is reduced, and the excess energy of photovoltaic power generation is often wasted because it is not reasonably used, which seriously restricts the energy utilization and economy of the photovoltaic water pump system. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method, device, medium and computer equipment for maximizing power utilization tracking to overcome the disadvantage that the existing water pumps are difficult to dynamically match the optimal power output point of the photovoltaic panel.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: A method for maximizing power utilization rate tracking, comprising:

[0007] Calculate the first operating power P corresponding to the pump running at the first operating frequency F1 k-1 ;

[0008] In response to the target command voltage U1 corresponding to the maximum power point of the photovoltaic panel and the first operating frequency F1 of the water pump, an actual command voltage U2 for controlling the operating frequency of the water pump is calculated;

[0009] Based on the actual command voltage U2, adjusting the operating frequency of the water pump to obtain a second operating frequency F2 of the water pump;

[0010] Calculate the second operating power P corresponding to the water pump running at the second operating frequency F2 k ;

[0011] Compare the first operating power P k-1 and the second operating power P k Based on the comparison result, the target command voltage U1 is updated according to a predetermined step voltage value to adjust the power of the water pump.

[0012] In one embodiment, the actual command voltage U2 for controlling the operating frequency of the water pump is calculated in response to the target command voltage U1 corresponding to the maximum power point of the photovoltaic panel and the first operating frequency F1 of the water pump, specifically including:

[0013] U2=U1*k1+U1*k2*F1 / F n ;

[0014] Among them, F n represents the rated operating frequency of the water pump, k1 represents the first proportionality coefficient, k2 represents the second proportionality coefficient, and k1 and k2 satisfy k1+k2=1.

[0015] In one embodiment, adjusting the operating frequency of the water pump based on the actual command voltage U2 to obtain the second operating frequency F2 of the water pump specifically includes:

[0016] F2=k p ΔU+k i ∫ΔUdt;

[0017] Among them, k p is the proportional gain parameter, k i is the integral gain parameter, and ΔU is specifically the difference between the actual operating voltage of the water pump and the actual command voltage U2.

[0018] In one embodiment, the first proportionality coefficient k1=0.7, and the second proportionality coefficient k2=0.3; or the first proportionality coefficient k1=0.6, and the second proportionality coefficient k2=0.4.

[0019] In one embodiment, when the first operating frequency F1=0, the target command voltage U1 is specifically:

[0020] U1=U0*k3;

[0021] Among them, k3 is the voltage regulation coefficient, and U0 is the open circuit voltage corresponding to the maximum power point of the photovoltaic panel.

[0022] In one embodiment, the second operating power P corresponding to the water pump running at the second operating frequency F2 is calculated. k , including:

[0023]

[0024] in, Indicates the relationship coefficient between the neutral voltage and phase voltage of three-phase electricity; is the power factor; U uv is the actual operating voltage of the water pump; I uv Indicates the actual operating current of the pump.

[0025] In one embodiment, the comparing the first operating power P k-1 and the second operating power P k , based on the comparison result, the target command voltage U1 is updated according to a predetermined step voltage value to adjust the power of the water pump, specifically including:

[0026] In the second operating power P k Greater than the first operating power P k-1 In the case of, the method of controlling the target command voltage U1 to adjust the step voltage value is the same as the previous cycle;

[0027] In the second operating power P k Less than the first operating power P k-1 In this case, the method of controlling the target command voltage U1 to adjust the step voltage value is opposite to that of the previous cycle.

[0028] A power utilization maximization tracking device, comprising:

[0029] The first power calculation unit is used to calculate the first operating power P corresponding to the water pump when it is running at the first operating frequency F1. k-1 ;

[0030] A command voltage calculation unit, for calculating an actual command voltage U2 for controlling the operating frequency of the water pump in response to a target command voltage U1 corresponding to the maximum power point of the photovoltaic panel and a first operating frequency F1 of the water pump;

[0031] An operating frequency adjustment unit, used for adjusting the operating frequency of the water pump based on the actual command voltage U2 to obtain a second operating frequency F2 of the water pump;

[0032] The second power calculation unit is used to calculate the second operating power P corresponding to the water pump when it runs at the second operating frequency F2. k ;

[0033] The command voltage updating unit is used to compare the first operating power P k-1 and the second operating power P k Based on the comparison result, the target command voltage U1 is updated according to a predetermined step voltage value to adjust the power of the water pump.

[0034] A computer-readable storage medium stores a computer program, which implements the steps of the above method when executed by a processor.

[0035] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0036] In summary, the present invention has the following beneficial effects: A method for maximizing power utilization rate tracking comprises: calculating a first operating power P corresponding to a water pump operating at a first operating frequency F1 k-1 ; In response to the target command voltage U1 corresponding to the maximum power point of the photovoltaic panel and the first operating frequency F1 of the water pump, calculate the actual command voltage U2 for controlling the operating frequency of the water pump; based on the actual command voltage U2, adjust the operating frequency of the water pump to obtain the second operating frequency F2 of the water pump; calculate the second operating power P corresponding to the water pump when the water pump operates at the second operating frequency F2 k ; Compare the first operating power P k-1 and the second operating power P k , based on the comparison result, the target command voltage U1 is updated according to the predetermined step voltage value to adjust the power of the water pump; the method of the present invention is adopted to dynamically adjust the operating frequency of the water pump to match the maximum power point output of the solar photovoltaic panel, thereby significantly improving the utilization rate of photovoltaic power. It adopts a closed-loop control mechanism, calculates and optimizes power output in real time, has the ability to adapt to environmental changes, and ensures efficient and stable operation of the system. The solution design is simple, has both versatility and scalability, is suitable for a variety of application scenarios, and reduces energy waste to achieve energy conservation and environmental protection goals. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A flow chart of a power utilization maximization tracking method of the present invention;

[0038] Figure 2 A structural diagram of a power utilization maximization tracking device in an embodiment of the present invention;

[0039] Figure 3 is an internal structure diagram of a computer device in an embodiment of the present invention;

[0040] Figure 4 Schematic diagram of the photovoltaic water pump circuit structure in an embodiment of the present invention;

[0041] Figure 5 Schematic diagram of photovoltaic power-voltage characteristic curve in an embodiment of the present invention.

[0042] In the figure: 1. first power calculation unit; 2. command voltage calculation unit; 3. operating frequency adjustment unit; 4. second power calculation unit; 5. command voltage update unit. DETAILED DESCRIPTION

[0043] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. Several embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0044] In the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0045] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0046] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0047] In several embodiments provided in the present application, any function can be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for enabling a device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0048] The above is only a specific implementation of the present application. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application should be based on the protection scope of the claims.

[0049] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0050] Embodiment 1

[0051] In order to solve the above problems, the present invention provides a method for maximizing power utilization rate tracking, such as Figure 1 As shown, including:

[0052] S1. Calculate the first operating power P corresponding to the pump running at the first operating frequency F1. k-1 ;

[0053] S2, in response to the target command voltage U1 corresponding to the maximum power point of the photovoltaic panel and the first operating frequency F1 of the water pump, calculating the actual command voltage U2 for controlling the operating frequency of the water pump;

[0054] S3, adjusting the operating frequency of the water pump based on the actual command voltage U2 to obtain a second operating frequency F2 of the water pump;

[0055] S4, calculating the second operating power P corresponding to the water pump when it runs at the second operating frequency F2. k ;

[0056] S5, comparing the first operating power P k-1 and the second operating power P k Based on the comparison result, the target command voltage U1 is updated according to a predetermined step voltage value to adjust the power of the water pump.

[0057] like Figure 4 As shown in the figure, it is a schematic diagram of the structure of using photovoltaic power supply to drive the water pump, in which the solar panel outputs direct current, which is converted into three-phase alternating current by the frequency converter to provide power for the water pump. For the convenience of calculation, all voltages in this application refer to the voltage between the photovoltaic panel and the frequency converter, in order to regard the frequency converter and the water pump as a whole, so as to facilitate the calculation of their power.

[0058] In practical applications, it is necessary to first determine the first operating power of the water pump. The operating power of the water pump can be calculated based on the voltage detected by the sampler and the current detected by the sampler. If it is in the initial state and the water pump has not yet started, the first operating power P of the water pump is k-1 =0.

[0059] The target command voltage U1 refers to the voltage value that needs to be provided to the water pump when the photovoltaic panel is currently operating at the maximum power point. If you want to control the water pump to use the power output of the photovoltaic panel as much as possible, because the maximum power point of the photovoltaic panel will change due to environmental factors, the target command voltage U1 needs to be adjusted continuously so that the power of the water pump can follow the maximum power point of the photovoltaic panel. In order to adjust the frequency of the water pump, it is necessary to calculate the actual command voltage U2 corresponding to the current operating frequency of the water pump.

[0060] According to the voltage difference between the actual command voltage U2 of the water pump and the actual output voltage of the photovoltaic panel, the operating frequency of the water pump is adjusted. After adjusting the operating frequency of the water pump, the operating power of the water pump needs to be calculated. The water pump is a variable frequency water pump. The higher the frequency of the water pump, the greater the power of the water pump, and the lower the frequency of the water pump, the smaller the power of the water pump. Therefore, by adjusting the frequency of the water pump, the water pump can make the maximum use of the output power of the photovoltaic panel.

[0061] After adjusting the operating frequency of the water pump, recalculate the second operating power P of the water pump k , according to the first operating power P k-1 and the second operating power P k By adaptively adjusting the target command voltage U1 for controlling the water pump based on the comparison result, the operating frequency of the water pump can be made closer to the output power of solar energy, so as to maximize the utilization rate of the output power of solar energy.

[0062] In one embodiment, the actual command voltage U2 for controlling the operating frequency of the water pump is calculated in response to the target command voltage U1 corresponding to the maximum power point of the photovoltaic panel and the first operating frequency F1 of the water pump, specifically including:

[0063] U2=U1*k1+U1*k2*F1 / F n ;

[0064] Among them, F n represents the rated operating frequency of the water pump, k1 represents the first proportionality coefficient, k2 represents the second proportionality coefficient, and k1 and k2 satisfy k1+k2=1.

[0065] In practical applications, the rated frequency of the water pump indicates the maximum frequency at which the water pump can operate, which corresponds to the maximum power working state of the water pump. The actual command voltage U2 of the water pump is calculated using the target command voltage U1, which means that the actual operating frequency of the water pump is increased by adjusting the actual operating voltage of the water pump so that the water pump can operate at the rated frequency as much as possible. When the first operating frequency F1 of the water pump is equal to the rated operating frequency F n , we can get U2=U1, that is, the actual command voltage of the water pump is equal to the target command voltage of the water pump. When the operating frequency of the water pump is 0, U2=U1*k1. That is to say, the first proportional coefficient is needed to start the water pump at a lower starting voltage. As the operating frequency of the water pump increases and gradually reaches the rated operating frequency, the power of the water pump can gradually approach U1.

[0066] In one embodiment, adjusting the operating frequency of the water pump based on the actual command voltage U2 to obtain the second operating frequency F2 of the water pump specifically includes:

[0067] F2=k p ΔU+k i ∫ΔUdt;

[0068] Among them, k p is the proportional gain parameter, k i is the integral gain parameter, and ΔU is specifically the difference between the actual operating voltage of the water pump and the actual command voltage U2.

[0069] In practical applications, there is a difference between the actual operating voltage of the water pump and the actual command voltage U2. Through this difference, PI control can eliminate the steady-state error, so that the water pump can continuously adjust its frequency based on this difference, so that the frequency can be adjusted under the control of voltage.

[0070] Among them, k p ΔI is a proportional control term, directly proportional to the current deviation. The larger the k p This will make the controller more sensitive to deviations and thus respond quickly to system changes. i ∫ΔUdt is the integral control term, which represents the accumulation of all deviations in the past time. Integral control can eliminate steady-state errors and ensure that the system can accurately reach the target value in the end, that is, by controlling the second operating frequency F2, the power of the water pump is closer to the actual operating voltage of the water pump. Figure 4It can be seen that the actual operating voltage of the water pump is the output voltage of the photovoltaic panel.

[0071] In one embodiment, the first proportionality coefficient k1=0.7, and the second proportionality coefficient k2=0.3; or the first proportionality coefficient k1=0.6, and the second proportionality coefficient k2=0.4.

[0072] In practical applications, by adjusting the first proportional coefficient or the second proportional coefficient, the water pump can have a smaller starting voltage in the initial state, so that the water pump can start to rotate smoothly, avoiding damage to the water pump due to excessive initial voltage.

[0073] In one embodiment, when the first operating frequency F1=0, the target command voltage U1 is specifically:

[0074] U1=U0*k3;

[0075] Among them, k3 is the voltage regulation coefficient, and U0 is the open circuit voltage corresponding to the maximum power point of the photovoltaic panel.

[0076] In practical applications, some photovoltaic panels may not be marked with the target voltage value of the photovoltaic panels, so it is necessary to first measure the open circuit voltage of the photovoltaic panel, and then multiply it by a voltage adjustment coefficient as the initial target command voltage, and then gradually update the target command voltage I1 in subsequent steps.

[0077] In one embodiment, the second operating power P corresponding to the water pump running at the second operating frequency F2 is calculated. k , including:

[0078]

[0079] in, Indicates the relationship coefficient between the neutral voltage and phase voltage of three-phase electricity; is the power factor; U uv is the actual operating voltage of the water pump; I uv Indicates the actual operating current of the pump.

[0080] In actual applications, the photovoltaic panel is connected to the water pump through a frequency converter, in which the frequency converter converts the direct current output by the photovoltaic panel into three-phase alternating current compatible with the water pump. If the water pump and the frequency converter are regarded as a whole, then what is connected to the photovoltaic panel is a two-terminal DC module. Since the current output by the photovoltaic panel is not stable enough, it is difficult to accurately calculate its power. Therefore, in order to accurately calculate the power of the water pump, this application sets a sampler between the frequency converter and the water pump to accurately measure the voltage and current of the water pump. Since three-phase electricity is used in the water pump, the power in the water pump also needs to consider the power factor of the water pump. The power of the frequency converter is certain, that is, the sum of the power of the water pump and the power of the frequency converter is the power output by the photovoltaic panel. The power of the water pump and the power output of the photovoltaic panel can be regarded as a linear relationship.

[0081] In one embodiment, the comparing the first operating power P k-1 and the second operating power P k , based on the comparison result, the target command voltage U1 is updated according to a predetermined step voltage value to adjust the power of the water pump, specifically including:

[0082] In the second operating power P k Greater than the first operating power P k-1 In the case of, the method of controlling the target command voltage U1 to adjust the step voltage value is the same as the previous cycle;

[0083] In the second operating power P k Less than the first operating power P k-1 In this case, the method of controlling the target command voltage U1 to adjust the step voltage value is opposite to that of the previous cycle.

[0084] Based on the above content, we know that since the power of the inverter is a fixed value, the sum of the power of the water pump and the rated power consumed by the inverter can be regarded as the actual output power of the photovoltaic panel. In other words, there is a linear relationship between the power of the photovoltaic panel and the water pump. By comparing the power change of the water pump, it can be regarded as the power change of the photovoltaic panel.

[0085] like Figure 5 The figure shows a voltage-power curve of a photovoltaic panel. Based on the figure, it can be seen that the output power of the photovoltaic panel reaches the maximum at the voltage point of 68V. Whether it is higher than 68V or lower than 68V, its power will decrease. Therefore, for the solar maximum power point tracking technology, it is necessary to control the solar photovoltaic panel to operate near the voltage threshold to maintain the output power of the photovoltaic panel. When the target command voltage U1 is adjusted, the power of the water pump will also change with the voltage. In the second operating power P k Greater than the first operating power P k-1In the case of the above, the step adjustment value of the target command voltage U1 is controlled to be the same as that in the previous stage. k Less than the first operating power P k-1 In this case, the step adjustment value of the target command voltage U1 is controlled opposite to that of the previous stage.

[0086] Specifically, if the second operating power P k Greater than the first operating power P k-1 , indicating that the adjustment direction of the target command voltage U1 of the water pump in the last time is correct, and the power of the water pump will be closer to the highest point of the output power of the photovoltaic panel. In this adjustment process, the last adjustment method is still maintained. Specifically, the adjustment method includes: U1=U1+5V or U1=U1-5V; that is, when the adjustment of the target command voltage U1 last time was to increase the step voltage value, the step voltage value is also increased this time. When the adjustment of the target command voltage U1 last time was to reduce the step voltage value, the step voltage value is also reduced this time.

[0087] Conversely, if the second operating power P k Less than the first operating power P k-1 , indicating that the adjustment direction of the target command voltage U1 of the water pump in the last time is wrong, and the power of the water pump will be further away from the highest point of the output power of the photovoltaic panel. Therefore, in this adjustment process, the adjustment method needs to be opposite to the last adjustment method. Among them, the adjustment method includes: U1=U1+5V or U1=U1-5V; that is, when the target command voltage U1 was adjusted to increase the step voltage value last time, it is adjusted to decrease the step voltage value this time. When the target command voltage U1 was adjusted to decrease the step voltage value last time, it is adjusted to increase the step voltage value this time.

[0088] Take a specific example to illustrate the above results. Figure 5 As shown in the figure, when the output voltage of the photovoltaic panel is 68V, the corresponding maximum output power is 1850W. In order to maintain the maximum output power, the output voltage of the photovoltaic panel needs to be controlled to fluctuate around 68V, such as Figure 5As shown by the horizontal line corresponding to 1600W in the figure. When adjusting the output power change of the photovoltaic panel, there are two probable situations, one is that the output power of the photovoltaic panel increases, and the other is that the output power of the photovoltaic panel decreases (not considering the case where the power is equal twice). In the case of an increase in output power, if the output power is controlled by voltage, four power changes will correspond to it: ① On the left side of the highest point, the output power of the photovoltaic panel increases from A1 to B1; ② On the right side of the highest point, the output power of the photovoltaic panel increases from A2 to B2; ③ The output power of the photovoltaic panel increases from A1 to B2 across the highest point; ④ The output power of the photovoltaic panel increases from A2 to B1 across the highest point. For these four power increase situations, it is shown that the output power of the photovoltaic panel is closer to the maximum power point. And for the two situations ① and ②, there is still a certain amount of room for increase after the power increases. Therefore, after comparing the power, if the power increases, the adjustment method of the target command voltage U1 of the previous time can be used to continue to adjust to further improve the power utilization rate.

[0089] And for the two cases ③ and ④, when the adjusted power exceeds the highest point, continuing to use the previous method will cause the power to drop. For example, after the power is increased from A1 to B2 by increasing the voltage, the voltage will continue to be increased according to the previous method. After continuing to increase the voltage, the power will drop from the highest point. Assuming that after the second increase in voltage, the power drops from B2 to A2, at this time, there is a power drop change other than the previous four cases. Therefore, it is necessary to reduce the voltage value in the third adjustment in the reverse adjustment way to make the power closer to the maximum power point.

[0090] Similarly, there are four cases of voltage drop: ⑤ On the left side of the highest point, the output power of the photovoltaic panel drops from B1 to A1; ⑥ On the right side of the highest point, the output power of the photovoltaic panel drops from B2 to A2; ⑦ The output power of the photovoltaic panel drops from B1 to A2 across the highest point; ⑧ The output power of the photovoltaic panel drops from B2 to A1 across the highest point. In any of the above four power drop situations, in order to improve the power utilization rate, it is necessary to control the voltage adjustment direction to move in the opposite direction. That is, the step value of the control voltage moves in the opposite direction.

[0091] In one embodiment, the step voltage value is 5V.

[0092] In one embodiment, in order to enable the water pump to continuously detect and follow the maximum voltage value, the method in this embodiment needs to be executed once every predetermined time to adjust the target command voltage U1 of the water pump.

[0093] Embodiment 2

[0094] See also Figure 2, a power utilization maximization tracking device, the power utilization maximization tracking device comprising:

[0095] The first power calculation unit 1 is used to calculate the first operating power P corresponding to the water pump when it runs at the first operating frequency F1. k-1 ;

[0096] The command voltage calculation unit 2 is used to calculate the actual command voltage U2 for controlling the operating frequency of the water pump in response to the target command voltage U1 corresponding to the maximum power point of the photovoltaic panel and the first operating frequency F1 of the water pump;

[0097] An operating frequency adjustment unit 3, used for adjusting the operating frequency of the water pump based on the actual command voltage U2 to obtain a second operating frequency F2 of the water pump;

[0098] The second power calculation unit 4 is used to calculate the second operating power P corresponding to the water pump when it runs at the second operating frequency F2. k ;

[0099] The command voltage updating unit 5 is used to compare the first operating power P k-1 and the second operating power P k Based on the comparison result, the target command voltage U1 is updated according to a predetermined step voltage value to adjust the power of the water pump.

[0100] For the specific definition of the power utilization maximization tracking device, please refer to the definition of the power utilization maximization tracking method above, which will not be repeated here. Each module in the above-mentioned power utilization maximization tracking device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0101] Those skilled in the art will understand that Figure 2 The 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 of the solution of the present application. The specific power utilization maximization tracking device may include more or less components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0102] Embodiment 3

[0103] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the power utilization maximization tracking method as described in Example 1 is implemented.

[0104] Embodiment 4

[0105] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 3 As shown. The computer device includes a processor, a memory, a network interface and a database connected through a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. When the computer program is executed by the processor, a power utilization maximization tracking method is implemented.

[0106] Those skilled in the art will understand that Figure 3 The 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.

[0107] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0108] S1. Calculate the first operating power P corresponding to the pump running at the first operating frequency F1. k-1 ;

[0109] S2, in response to the target command voltage U1 corresponding to the maximum power point of the photovoltaic panel and the first operating frequency F1 of the water pump, calculating the actual command voltage U2 for controlling the operating frequency of the water pump;

[0110] S3, adjusting the operating frequency of the water pump based on the actual command voltage U2 to obtain a second operating frequency F2 of the water pump;

[0111] S4, calculating the second operating power P corresponding to the water pump when it runs at the second operating frequency F2. k ;

[0112] S5, comparing the first operating power P k-1 and the second operating power P k Based on the comparison result, the target command voltage U1 is updated according to a predetermined step voltage value to adjust the power of the water pump.

[0113] In one embodiment, the actual command voltage U2 for controlling the operating frequency of the water pump is calculated in response to the target command voltage U1 corresponding to the maximum power point of the photovoltaic panel and the first operating frequency F1 of the water pump, specifically including:

[0114] U2=U1*k1+U1*k2*F1 / F n ;

[0115] Among them, F n represents the rated operating frequency of the water pump, k1 represents the first proportionality coefficient, k2 represents the second proportionality coefficient, and k1 and k2 satisfy k1+k2=1.

[0116] In one embodiment, adjusting the operating frequency of the water pump based on the actual command voltage U2 to obtain the second operating frequency F2 of the water pump specifically includes:

[0117] F2=k p ΔU+k i ∫ΔUdt;

[0118] Among them, k p is the proportional gain parameter, k i is the integral gain parameter, and ΔU is specifically the difference between the actual operating voltage of the water pump and the actual command voltage U2.

[0119] In one embodiment, the first proportionality coefficient k1=0.7, and the second proportionality coefficient k2=0.3; or the first proportionality coefficient k1=0.6, and the second proportionality coefficient k2=0.4.

[0120] In one embodiment, when the first operating frequency F1=0, the target command voltage U1 is specifically:

[0121] U1=U0*k3;

[0122] Among them, k3 is the voltage regulation coefficient, and U0 is the open circuit voltage corresponding to the maximum power point of the photovoltaic panel.

[0123] In one embodiment, the second operating power P corresponding to the water pump running at the second operating frequency F2 is calculated. k , specifically including:

[0124]

[0125] in, Indicates the relationship coefficient between the neutral voltage and phase voltage of three-phase electricity; is the power factor; U uv is the actual operating voltage of the water pump; I uv Indicates the actual operating current of the pump.

[0126] In one embodiment, the comparing the first operating power P k-1 and the second operating power P k , based on the comparison result, the target command voltage U1 is updated according to a predetermined step voltage value to adjust the power of the water pump, specifically including:

[0127] In the second operating power P k Greater than the first operating power P k-1 In the case of, the method of controlling the target command voltage U1 to adjust the step voltage value is the same as the previous cycle;

[0128] In the second operating power P k Less than the first operating power P k-1 In this case, the method of controlling the target command voltage U1 to adjust the step voltage value is opposite to that of the previous cycle.

[0129] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0130] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0131] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for maximizing power utilization rate tracking, characterized in that: include: Calculate the first operating power P corresponding to the pump running at the first operating frequency F1 k-1 ; In response to the target command voltage U1 corresponding to the maximum power point of the photovoltaic panel and the first operating frequency F1 of the water pump, an actual command voltage U2 for controlling the operating frequency of the water pump is calculated; Based on the actual command voltage U2, adjusting the operating frequency of the water pump to obtain a second operating frequency F2 of the water pump; Calculate the second operating power P corresponding to the water pump running at the second operating frequency F2 k ; Compare the first operating power P k-1 and the second operating power P k Based on the comparison result, the target command voltage U1 is updated according to a predetermined step voltage value to adjust the power of the water pump.

2. A method for maximizing power utilization rate tracking according to claim 1, characterized in that: The step of calculating the actual command voltage U2 for controlling the operating frequency of the water pump in response to the target command voltage U1 corresponding to the maximum power point of the photovoltaic panel and the first operating frequency F1 of the water pump specifically includes: U2=U1*k1+U1*k2*F1 / F n ; Among them, F n represents the rated operating frequency of the water pump, k1 represents the first proportionality coefficient, k2 represents the second proportionality coefficient, and k1 and k2 satisfy k1+k2=1.

3. A method for maximizing power utilization rate tracking according to claim 2, characterized in that: The step of adjusting the operating frequency of the water pump based on the actual command voltage U2 to obtain the second operating frequency F2 of the water pump specifically includes: F2=k p ΔU+k i ∫ΔUdt; Among them, k p is the proportional gain parameter, k i is the integral gain parameter, and ΔU is specifically the difference between the actual operating voltage of the water pump and the actual command voltage U2.

4. The method for maximizing power utilization rate tracking according to claim 3, characterized in that: The first proportional coefficient k1=0.7, the second proportional coefficient k2=0.3; or the first proportional coefficient k1=0.6, the second proportional coefficient k2=0.

4.

5. The method for maximizing power utilization rate tracking according to claim 3, characterized in that: When the first operating frequency F1=0, the target command voltage U1 is specifically: U1=U0*k3; Among them, k3 is the voltage regulation coefficient, and U0 is the open circuit voltage corresponding to the maximum power point of the photovoltaic panel.

6. The method for maximizing power utilization rate tracking according to claim 1, characterized in that: The second operating power P corresponding to the water pump running at the second operating frequency F2 is calculated. k , including: in, Indicates the relationship coefficient between the neutral voltage and phase voltage of three-phase electricity; is the power factor; U uv is the actual operating voltage of the water pump; I uv Indicates the actual operating current of the pump.

7. The method for maximizing power utilization rate tracking according to claim 1, characterized in that: The comparison of the first operating power P k-1 and the second operating power P k , based on the comparison result, the target command voltage U1 is updated according to a predetermined step voltage value to adjust the power of the water pump, specifically including: In the second operating power P k Greater than the first operating power P k-1 In the case of, the method of controlling the target command voltage U1 to adjust the step voltage value is the same as the previous cycle; In the second operating power P k Less than the first operating power P k-1 In this case, the method of controlling the target command voltage U1 to adjust the step voltage value is opposite to that of the previous cycle.

8. A power utilization maximization tracking device, characterized in that: The device comprises: The first power calculation unit is used to calculate the first operating power P corresponding to the water pump when it is running at the first operating frequency F1. k-1 ; A command voltage calculation unit, for calculating an actual command voltage U2 for controlling the operating frequency of the water pump in response to a target command voltage U1 corresponding to the maximum power point of the photovoltaic panel and a first operating frequency F1 of the water pump; An operating frequency adjustment unit, used for adjusting the operating frequency of the water pump based on the actual command voltage U2 to obtain a second operating frequency F2 of the water pump; The second power calculation unit is used to calculate the second operating power P corresponding to the water pump when it runs at the second operating frequency F2. k ; The command voltage updating unit is used to compare the first operating power P k-1 and the second operating power P k Based on the comparison result, the target command voltage U1 is updated according to a predetermined step voltage value to adjust the power of the water pump.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the power utilization maximization tracking method as described in any one of claims 1 to 7 is implemented.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the power utilization maximization tracking method as described in any one of claims 1 to 7 is implemented.

Images