Control method and system for photovoltaic power generation

Abstract

The invention relates to the technical field of photovoltaic power generation, in particular to a control method and system for photovoltaic power generation, and the method comprises the steps: periodically determining whether the power supply is qualified or not based on a load stability parameter and an interference impact parameter, and controlling each power generation module to operate based on a power utilization change parameter when the power supply is judged to be abnormal, comprising the steps of controlling a photovoltaic power generation module to supply power to a load module, or controlling the photovoltaic power generation module and a wind power generation module to supply power to the load module; when the adjustment of the power supply ratio is completed, determining whether to control the operation of the energy storage module based on the range of the electric energy output by the photovoltaic power generation module obtained by the energy storage module at each time node in the preset monitoring period; the load module, the wind power generation module, the photovoltaic power generation module and the power storage module are monitored, the actual condition of the load is determined according to the monitoring parameters, the power supply parameters of the power generation modules are coordinated, stable power supply is provided for the load module, and the power supply efficiency of the power generation modules is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to a control method and system for photovoltaic power generation. Background Art

[0002] In view of the gradual exhaustion of traditional fossil energy and the environmental pollution it causes, the development of green energy should be strengthened in the next few years. Most regions with sufficient resources mainly use photovoltaic power generation. For remote and unpowered mountainous areas that are difficult to reach by large power grids, there are problems such as low reliability and poor stability of single energy power generation. Remote mountainous areas have the advantage of rich wind and solar resources. Therefore, this study introduces multi-energy complementary power generation, that is, wind and solar complementary power generation system.

[0003] Chinese patent publication number: CN114977459B, discloses a photovoltaic wind power supply system and power supply method for ultra-high voltage iron tower, the system includes an electric energy input module, the electric energy input module includes a photovoltaic power generation panel and a micro wind turbine; the electric energy input module is connected to the electric energy collection module, the electric energy collection module is connected to the electric energy storage module, the electric energy storage module includes a battery pack and a charge and discharge management module; the electric energy storage module is connected to the electric equipment through the electric energy output module; by cooperating with the improved small-volume wind turbine and photovoltaic power generation, the wind energy and solar energy in the sky of the ultra-high voltage iron tower are comprehensively utilized; it can be seen that the above technical solution has the following problems: it is impossible to coordinate the power supply parameters of each power generation module according to the actual situation of the load, which affects the power consumption stability of the load, and further affects the power supply efficiency of each power generation module. Summary of the invention

[0004] To this end, the present invention provides a control method and system for photovoltaic power generation, so as to overcome the problem in the prior art that the power supply parameters of each power generation module cannot be coordinated according to the actual situation of the load, which affects the power consumption stability of the load and further affects the power supply efficiency of each power generation module.

[0005] In one aspect, the present invention provides a control method for photovoltaic power generation, comprising: Obtain the power consumption of the load module, the power output of the photovoltaic power generation module obtained by the energy storage module, and the power consumption of each power-consuming device at each time node within the preset monitoring period; Determine the total power consumption based on the power consumption of each power-consuming device, determine the load stability parameter based on the total power consumption, and determine the interference impact parameter based on the power consumption of each power-consuming device and the total power consumption; Periodically determine whether the power supply is qualified based on load stability parameters and interference impact parameters, including: When it is determined that the power supply is abnormal, the operation of each power generation module is controlled based on the power consumption change parameter, including controlling the photovoltaic power generation module to supply power to the load module, or controlling the photovoltaic power generation module and the wind power generation module to supply power to the load module, and determining the power supply ratio of the photovoltaic power generation module and the wind power generation module; When the adjustment for the power supply ratio is completed, it is determined whether to control the operation of the energy storage module based on the range of the electric energy output by the photovoltaic power generation module obtained by the energy storage module at each time node within the preset monitoring period, and when it is determined that the energy storage module is controlled to supply power to the load module, the ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is adjusted to a corresponding value; Or, when it is determined that the power supply is qualified, each power supply module is controlled to continue to operate using the current operating parameters.

[0006] Furthermore, the process of determining the load stability parameter is to determine the sum of the calculated power consumption of each power-consuming device as the total power consumption of the load module, and to determine the standard deviation of the total power consumption of the load module at each time node within the preset monitoring period as the load stability parameter; The process of determining whether the power supply is qualified based on the load stability parameters includes: If the load stability parameter is less than or equal to the first preset load stability parameter, it is determined that the power supply is qualified; If the load stability parameter is less than or equal to the second preset load stability parameter and greater than the first preset load stability parameter, determining whether the power supply is qualified based on the interference impact parameter; If the load stability parameter is greater than the second preset load stability parameter, the power supply is determined to be abnormal, and the operation of each power generation module is controlled based on the power consumption change parameter.

[0007] Furthermore, the process of determining whether the power supply is qualified based on the interference impact parameter includes: The ratio of the average power consumption of each electrical device to the total power consumption of the load module is recorded as the interference impact parameter; If the interference impact parameter is less than or equal to the preset impact parameter, the power supply is determined to be qualified; If the interference impact parameter is greater than the preset impact parameter, the number of time nodes within the preset monitoring period obtained is adjusted to a corresponding value based on the interference impact parameter.

[0008] Further, the number of time nodes within the preset monitoring period obtained is adjusted to a corresponding value based on the interference impact parameter, wherein: The increase in the number of time nodes obtained within the preset monitoring period is proportional to the interference impact parameter.

[0009] Furthermore, the process of controlling the operation of each power generation module based on the power consumption change parameter includes: Determine the power consumption change parameter, record the power consumption of the load module in a single preset monitoring cycle as the load power consumption, record the average value of the load power consumption in each historical preset monitoring cycle as the historical average power consumption, solve the ratio of the load power consumption in the current preset monitoring cycle to the historical average power consumption, and obtain the power consumption change parameter; When the power consumption change parameter is less than or equal to the preset change parameter, the photovoltaic power generation module is controlled to supply power to the load module; When the power consumption change parameter is greater than the preset change parameter, the photovoltaic power generation module and the wind power generation module are controlled to supply power to the load module, and the power supply ratio of the photovoltaic power generation module and the wind power generation module is corrected based on the acquired wind speed.

[0010] Further, the power supply ratio is corrected based on the acquired wind speed, wherein the reduction of the power supply ratio is proportional to the wind speed.

[0011] Further, when the adjustment for the power supply ratio is completed, whether to control the operation of the energy storage module is determined based on the range of the electric energy output by the photovoltaic power generation module obtained by the energy storage module at each time node within the preset monitoring period, including: If the range is less than or equal to the preset range, each power generation module is controlled to continue to operate using the current operating parameters; If the range is greater than the preset range, the energy storage module is controlled to supply power to the load module, and the ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is adjusted to a corresponding value based on the range and the power consumption change parameter.

[0012] Furthermore, based on the range and the power consumption change parameter, the ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is adjusted to a corresponding value, wherein: The ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is recorded as the photovoltaic storage ratio; The reduction in the light-to-storage ratio determined based on the range is proportional to the range.

[0013] Furthermore, the reduction in the solar-to-storage ratio determined based on the power consumption change parameter is proportional to the power consumption change parameter.

[0014] On the other hand, the present invention also provides a control system using the above control method for photovoltaic power generation, comprising: A wind power generation module, which is used to convert output wind energy into electrical energy; Photovoltaic power generation modules, which are used to convert output solar energy into electrical energy; An energy storage module, which is connected to the wind power generation module and the photovoltaic power generation module respectively, and is used to store excess electric energy of the wind power generation module and the photovoltaic power generation module; A load module, which is connected to the wind power generation module, the photovoltaic power generation module and the energy storage module respectively, and is used to consume the electric energy of the wind power generation module, the photovoltaic power generation module and the energy storage module to meet the operation of various electrical equipment; A monitoring module, comprising an electric power monitoring meter connected to the load module for obtaining the power consumption of each electric device in the load module at a corresponding time node, an anemometer arranged adjacent to the wind power generation module for obtaining the wind speed, and a photovoltaic controller arranged between the photovoltaic power generation module and the energy storage module for obtaining the electric energy output by the photovoltaic power generation module; A data fitting module, which is connected to the monitoring module, is used to determine the total power consumption based on the power consumption of each power-consuming device, determine the load stability parameter based on the total power consumption, determine the interference impact parameter based on the power consumption of each power-consuming device and the total power consumption, determine the power consumption change parameter based on the power consumption of the load module, and determine the range based on the power output of the photovoltaic power generation module obtained by the energy storage module; The analysis module is respectively connected to the wind power generation module, the photovoltaic power generation module, the energy storage module, the monitoring module and the data fitting module, and is used to determine whether the power supply is qualified based on the load stability parameter and the interference impact parameter, and when the power supply is determined to be abnormal, control the operation of each power generation module based on the power consumption change parameter.

[0015] Compared with the prior art, the beneficial effect of the present invention lies in that the load module, wind power generation module, photovoltaic power generation module and power storage module are monitored, the actual load situation is determined based on the monitoring parameters, the power supply parameters of each power generation module are coordinated, stable power supply is provided for the load module, and the power supply efficiency of each power generation module is improved.

[0016] Furthermore, whether the power supply is qualified is determined based on the load stability parameter, which characterizes whether the power consumption of the load module is stable. When the load stability parameter is less than or equal to the first preset load stability parameter, the total power consumption of the load module at each time node within the preset monitoring period fluctuates little. At this time, the power supply is determined to be qualified, and it is determined that each power generation module continues to operate using the current operating parameters; when the load stability parameter is less than or equal to the second preset load stability parameter and greater than the first preset load stability parameter, in this case, the total power consumption of the load module fluctuates within a small range within the preset monitoring period. In this case, the power supply is determined to be qualified in combination with the interference impact parameter, which characterizes the impact of each electrical equipment on the load. The impact of the load module. When the interference impact parameter is greater than the preset impact parameter, there is a single power-consuming device with excessive power consumption. When the power consumption of the power-consuming device fluctuates, the total power consumption of the load module will fluctuate greatly, affecting the stability of power consumption. In this case, the amount of monitoring data obtained is increased, and the number of time nodes obtained within the preset monitoring period is increased to further determine the actual operation of the load module in detail, and comprehensively determine whether to control the operation of each power generation module based on the power consumption change parameter. By monitoring the specific situation of the load module, it is determined whether to change the operating parameters of each power generation module, which effectively solves the problem of large fluctuations in renewable energy energy output and improves the response speed and stability of each power generation module.

[0017] Furthermore, when it is determined that the power supply is abnormal, the operation of each power generation module is controlled based on the power consumption change parameter. The power consumption change parameter represents the total power consumption of the load module during the entire current preset monitoring period, that is, the load power consumption, and the power consumption compared with the average load power consumption of each historical preset monitoring period. When the power consumption change parameter is greater than the preset change parameter, in this case, the load power consumption of the load module during the current preset monitoring period is too large. In this case, the power of the wind power generation module is coordinated to supply power to the load module, and the power supply ratio of the photovoltaic power generation module and the wind power generation module is determined, so as to determine the specific power supply parameters according to the actual power generation environment. When the adjustment of the power supply ratio is completed, it is determined whether to control the energy storage based on the extreme difference. Module operation, the range characterizes the stability of the energy storage module in obtaining the electric energy output by the photovoltaic power generation module at each time node within the preset monitoring period. When the range is greater than the preset range, the power consumption of the load fluctuates too much, and there is a large amount of electric energy output by the photovoltaic power generation module. At this time, there is a risk of unstable power supply. The energy storage module is controlled to supply power to the load module, and the ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is adjusted to the corresponding value based on the range and power consumption change parameters. The control strategy of each power generation module is optimized, and the renewable energy and energy storage equipment are efficiently managed and integrated, thereby meeting the basic needs of rural and remote areas for stable power supply and improving the power supply efficiency of each power generation module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a module block diagram of a control system for photovoltaic power generation according to an embodiment of the present invention; Figure 2 A flow chart of the steps of a control method for photovoltaic power generation according to an embodiment of the present invention; Figure 3 A logic determination diagram for determining whether power supply is qualified based on load stability parameters according to an embodiment of the present invention; Figure 4 This is a logic decision diagram for determining whether power supply is qualified based on interference impact parameters according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0021] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0022] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figure 1 As shown, it is a module block diagram of a control system for photovoltaic power generation according to an embodiment of the present invention. The control system for photovoltaic power generation according to the present invention includes: A wind power generation module, which is used to convert output wind energy into electrical energy; Photovoltaic power generation modules, which are used to convert output solar energy into electrical energy; An energy storage module, which is connected to the wind power generation module and the photovoltaic power generation module respectively, and is used to store excess electric energy of the wind power generation module and the photovoltaic power generation module; A load module, which is connected to the wind power generation module, the photovoltaic power generation module and the energy storage module respectively, and is used to consume the electric energy of the wind power generation module, the photovoltaic power generation module and the energy storage module to meet the operation of various electrical equipment; A monitoring module, comprising an electric power monitoring meter connected to the load module for obtaining the power consumption of each electric device in the load module at a corresponding time node, an anemometer arranged adjacent to the wind power generation module for obtaining the wind speed, and a photovoltaic controller arranged between the photovoltaic power generation module and the energy storage module for obtaining the electric energy output by the photovoltaic power generation module; A data fitting module, which is connected to the monitoring module, is used to determine the total power consumption based on the power consumption of each power-consuming device, determine the load stability parameter based on the total power consumption, determine the interference impact parameter based on the power consumption of each power-consuming device and the total power consumption, determine the power consumption change parameter based on the power consumption of the load module, and determine the range based on the power output of the photovoltaic power generation module obtained by the energy storage module; The analysis module is respectively connected to the wind power generation module, the photovoltaic power generation module, the energy storage module, the monitoring module and the data fitting module, and is used to determine whether the power supply is qualified based on the load stability parameter and the interference impact parameter, and when the power supply is determined to be abnormal, control the operation of each power generation module based on the power consumption change parameter.

[0024] Specifically, there is no limitation on the specific structure of the wind power generation module, which may include a wind turbine generator set, which uses the wind wheel of the wind turbine generator set to capture wind energy and converts it into electrical energy output through a generator. It can be understood that wind energy can be converted into electrical energy. This is existing technology and will not be elaborated on.

[0025] Specifically, the wind power generation module includes a maximum power point tracking function. Through the wind power generation system control strategy based on dual PWM converters, a machine-side converter control strategy with a power outer loop and a current inner loop is adopted. In order to use the variable step size hill climbing search method, a MATLAB simulation model is established to ensure that the operating state of the wind turbine generator set is automatically adjusted according to different wind speed conditions, so that the wind power generation module always outputs electrical energy at the maximum power, thereby improving the utilization efficiency of wind energy. This is the existing technology and will not be repeated here.

[0026] Specifically, the photovoltaic power generation module also adopts the maximum power point tracking technology to ensure that the photovoltaic power generation module can output the maximum power under various lighting conditions. This is an existing technology and will not be described in detail.

[0027] See also Figure 2As shown, it is a flow chart of the steps of a control method for photovoltaic power generation according to an embodiment of the present invention. The control method for photovoltaic power generation according to the present invention includes: S1, obtaining the power consumption of the load module, the power output of the photovoltaic power generation module obtained by the energy storage module, and the power consumption of each power-consuming device at each time node within the preset monitoring period; S2, determining the total power consumption based on the power consumption of each power-consuming device, determining the load stability parameter based on the total power consumption, and determining the interference impact parameter based on the power consumption of each power-consuming device and the total power consumption; S3, periodically determine whether the power supply is qualified based on the load stability parameters and interference impact parameters, including: When it is determined that the power supply is abnormal, the operation of each power generation module is controlled based on the power consumption change parameter, including controlling the photovoltaic power generation module to supply power to the load module, or controlling the photovoltaic power generation module and the wind power generation module to supply power to the load module, and determining the power supply ratio of the photovoltaic power generation module and the wind power generation module; When the adjustment for the power supply ratio is completed, it is determined whether to control the operation of the energy storage module based on the range of the electric energy output by the photovoltaic power generation module obtained by the energy storage module at each time node within the preset monitoring period, and when it is determined that the energy storage module is controlled to supply power to the load module, the ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is adjusted to a corresponding value; Or, when it is determined that the power supply is qualified, each power supply module is controlled to continue to operate using the current operating parameters.

[0028] Specifically, the load module, wind power generation module, photovoltaic power generation module and power storage module are monitored, the actual load situation is determined based on the monitoring parameters, the power supply parameters of each power generation module are coordinated, stable power supply is provided for the load module, and the power supply efficiency of each power generation module is improved.

[0029] See also Figure 3 As shown, it is a logic decision diagram for determining whether power supply is qualified based on load stability parameters according to an embodiment of the present invention. The process of determining the load stability parameters according to the present invention is to determine the sum of the power consumption of each power-consuming device calculated as the total power consumption of the load module, and to determine the standard deviation of the total power consumption of the load module at each time node within the preset monitoring period solved as the load stability parameter; The process of determining whether the power supply is qualified based on the load stability parameters includes: If the load stability parameter is less than or equal to the first preset load stability parameter, it is determined that the power supply is qualified; If the load stability parameter is less than or equal to the second preset load stability parameter and greater than the first preset load stability parameter, determining whether the power supply is qualified based on the interference impact parameter; If the load stability parameter is greater than the second preset load stability parameter, the power supply is determined to be abnormal, and the operation of each power generation module is controlled based on the power consumption change parameter.

[0030] Specifically, the first preset load stability parameter is selected within the interval [0.12Q0, 0.23Q0], and the second preset load stability parameter is selected within the interval [0.35Q0, 0.43Q0]. Q0 is the average value of power consumption at each time node within the preset monitoring period.

[0031] See also Figure 4 As shown, it is a logic determination diagram for determining whether power supply is qualified based on interference impact parameters according to an embodiment of the present invention. The process of determining whether power supply is qualified based on interference impact parameters according to the present invention includes: The ratio of the average power consumption of each electrical device to the total power consumption of the load module is recorded as the interference impact parameter; If the interference impact parameter is less than or equal to the preset impact parameter, the power supply is determined to be qualified; If the interference impact parameter is greater than the preset impact parameter, the number of time nodes within the preset monitoring period obtained is adjusted to a corresponding value based on the interference impact parameter.

[0032] Specifically, the preset impact parameter C0 is selected within the interval [0.26, 0.41].

[0033] Specifically, whether the power supply is qualified is determined based on the load stability parameter. The load stability parameter characterizes whether the power consumption of the load module is stable. When the load stability parameter is less than or equal to the first preset load stability parameter, the total power consumption of the load module at each time node within the preset monitoring period has a small fluctuation. At this time, the power supply is determined to be qualified, and it is determined that each power generation module continues to operate using the current operating parameters; when the load stability parameter is less than or equal to the second preset load stability parameter and greater than the first preset load stability parameter, in this case, the total power consumption of the load module fluctuates within a small range within the preset monitoring period. In this case, the power supply is determined to be qualified in combination with the interference impact parameter. The interference impact parameter characterizes the impact of each electrical equipment on the load. The impact of the load module. When the interference impact parameter is greater than the preset impact parameter, there is a single power-consuming device with excessive power consumption. When the power consumption of the power-consuming device fluctuates, the total power consumption of the load module will fluctuate greatly, affecting the stability of power consumption. In this case, the amount of monitoring data obtained is increased, and the number of time nodes obtained within the preset monitoring period is increased to further determine the actual operation of the load module in detail, and comprehensively determine whether to control the operation of each power generation module based on the power consumption change parameter. By monitoring the specific situation of the load module, it is determined whether to change the operating parameters of each power generation module, which effectively solves the problem of large fluctuations in renewable energy energy output and improves the response speed and stability of each power generation module.

[0034] Specifically, the number of time nodes within the preset monitoring period obtained is adjusted to a corresponding value based on the interference impact parameter, wherein: The increase in the number of time nodes obtained within the preset monitoring period is proportional to the interference impact parameter.

[0035] In this embodiment, optionally, Comparing the interference impact parameter with a first preset impact comparison threshold and a second preset impact comparison threshold; If the interference impact parameter is less than or equal to the first preset impact comparison threshold, the number of time nodes within the preset monitoring period obtained is adjusted to 1.11 of the initial number; If the interference impact parameter is less than or equal to the second preset impact comparison threshold and greater than the first preset impact comparison threshold, the number of time nodes obtained within the preset monitoring period is adjusted to 1.21 times the initial number; If the interference impact parameter is greater than the second preset impact comparison threshold, the number of time nodes obtained within the preset monitoring period is adjusted to 1.34 times the initial number; The first preset impact comparison threshold is 1.2C0, and the second preset impact comparison threshold is 1.4C0.

[0036] Specifically, when the adjustment of the number of time nodes within the preset monitoring period is completed, whether the power supply is qualified is determined based on the re-acquired load stability parameter. When the load stability parameter is less than or equal to the first preset load stability parameter, the power supply is judged to be qualified; when the load stability parameter is greater than the first preset load stability parameter, the power supply is judged to be abnormal, and the operation of each power generation module is controlled based on the power consumption change parameter.

[0037] Specifically, the process of controlling the operation of each power generation module based on the power consumption change parameter includes: Determine the power consumption change parameter, record the power consumption of the load module in a single preset monitoring cycle as the load power consumption, record the average value of the load power consumption in each historical preset monitoring cycle as the historical average power consumption, solve the ratio of the load power consumption in the current preset monitoring cycle to the historical average power consumption, and obtain the power consumption change parameter; When the power consumption change parameter is less than or equal to the preset change parameter, the photovoltaic power generation module is controlled to supply power to the load module; When the power consumption change parameter is greater than the preset change parameter, the photovoltaic power generation module and the wind power generation module are controlled to supply power to the load module, and the power supply ratio of the photovoltaic power generation module and the wind power generation module is corrected based on the acquired wind speed.

[0038] Specifically, the preset change parameter G0 is selected within the interval [1.32, 1.57].

[0039] Specifically, there is no limit on the number of historical preset monitoring cycles selected to determine the historical average power consumption. It can be understood that in order to ensure the division of load power consumption within the current preset monitoring cycle, the number of historical preset monitoring cycles selected should be no less than 1,000.

[0040] Specifically, the power supply ratio is corrected based on the acquired wind speed, wherein the reduction of the power supply ratio is proportional to the wind speed.

[0041] In this embodiment, optionally, comparing the wind speed with a first preset wind speed and a second preset wind speed; When the wind speed is less than or equal to the first preset wind speed, the power supply ratio is adjusted to 0.91 times the initial power supply ratio; When the wind speed is less than or equal to the second preset wind speed and greater than the first preset wind speed, the power supply ratio is adjusted to 0.81 times the initial power supply ratio; When the wind speed is greater than the second preset wind speed, the power supply ratio is adjusted to 0.71 times the initial power supply ratio; The first preset wind speed is 2m / s, and the second preset wind speed is 4m / s.

[0042] Specifically, when the adjustment for the power supply ratio is completed, whether to control the operation of the energy storage module is determined based on the range of the electric energy output by the photovoltaic power generation module obtained by the energy storage module at each time node within the preset monitoring period, including: If the range is less than or equal to the preset range, each power generation module is controlled to continue to operate using the current operating parameters; If the range is greater than the preset range, the energy storage module is controlled to supply power to the load module, and the ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is adjusted to a corresponding value based on the range and the power consumption change parameter.

[0043] Specifically, the preset range J0 is selected within the interval [0.6Z0, 0.7Z0], and Z0 is the average value of the electric energy output by the photovoltaic power generation module obtained by the energy storage module at each time node within the preset monitoring period.

[0044] Specifically, when it is determined that the power supply is abnormal, the operation of each power generation module is controlled based on the power consumption change parameter. The power consumption change parameter represents the total power consumption of the load module during the entire current preset monitoring period, that is, the load power consumption, and the power consumption compared with the average load power consumption of each historical preset monitoring period. When the power consumption change parameter is greater than the preset change parameter, in this case, the load power consumption of the load module during the current preset monitoring period is too large. In this case, the power of the wind power generation module is coordinated to supply power to the load module, and the power supply ratio of the photovoltaic power generation module and the wind power generation module is determined, so as to determine the specific power supply parameters according to the actual power generation environment. When the adjustment of the power supply ratio is completed, it is determined whether to control the energy storage based on the extreme difference. Module operation, the range characterizes the stability of the energy storage module in obtaining the electric energy output by the photovoltaic power generation module at each time node within the preset monitoring period. When the range is greater than the preset range, the power consumption of the load fluctuates too much, and there is a large amount of electric energy output by the photovoltaic power generation module. At this time, there is a risk of unstable power supply. The energy storage module is controlled to supply power to the load module, and the ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is adjusted to the corresponding value based on the range and power consumption change parameters. The control strategy of each power generation module is optimized, and the renewable energy and energy storage equipment are efficiently managed and integrated, thereby meeting the basic needs of rural and remote areas for stable power supply and improving the power supply efficiency of each power generation module.

[0045] Specifically, the ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is adjusted to a corresponding value based on the range and power consumption change parameters, where: The ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is recorded as the photovoltaic storage ratio; The reduction in the light-to-storage ratio determined based on the range is proportional to the range.

[0046] In this embodiment, optionally, Compare the range with a first preset range comparison threshold and a second preset range comparison threshold; When the range is less than or equal to the first preset range comparison threshold, the light-to-storage ratio is adjusted to 0.95 times the initial light-to-storage ratio; When the range is less than or equal to the second preset range comparison threshold and greater than the first preset range comparison threshold, the light-to-storage ratio is adjusted to 0.86 times the initial light-to-storage ratio; When the range is greater than the second preset range comparison threshold, the light-to-storage ratio is adjusted to 0.74 times the initial light-to-storage ratio; The first preset range comparison threshold is 1.2J0, and the second preset range comparison threshold is 1.4J0.

[0047] Specifically, the reduction in the solar-to-storage ratio determined based on the electricity change parameter is proportional to the electricity change parameter.

[0048] In this embodiment, optionally, Comparing the power consumption change parameter with a first preset power consumption comparison threshold and a second preset power consumption comparison threshold; When the power consumption change parameter is less than or equal to the first preset power consumption comparison threshold, the photovoltaic energy storage ratio is adjusted to 0.97 times the current photovoltaic energy storage ratio; When the power consumption change parameter is less than or equal to the second preset power consumption comparison threshold and greater than the first preset power consumption comparison threshold, the photovoltaic energy storage ratio is adjusted to 0.86 times the current photovoltaic energy storage ratio; When the power consumption change parameter is greater than the second preset power consumption comparison threshold, the photovoltaic energy storage ratio is adjusted to 0.77 times the current photovoltaic energy storage ratio; The first preset power usage comparison threshold is 1.3G0, and the second preset power usage comparison threshold is 1.8G0.

[0049] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for photovoltaic power generation, characterized in that: include: Obtain the power consumption of the load module, the power output of the photovoltaic power generation module obtained by the energy storage module, and the power consumption of each power-consuming device at each time node within the preset monitoring period; Determine the total power consumption based on the power consumption of each power-consuming device, determine the load stability parameter based on the total power consumption, and determine the interference impact parameter based on the power consumption of each power-consuming device and the total power consumption; Periodically determine whether the power supply is qualified based on load stability parameters and interference impact parameters, including: When it is determined that the power supply is abnormal, the operation of each power generation module is controlled based on the power consumption change parameter, including controlling the photovoltaic power generation module to supply power to the load module, or controlling the photovoltaic power generation module and the wind power generation module to supply power to the load module, and determining the power supply ratio of the photovoltaic power generation module and the wind power generation module; When the adjustment for the power supply ratio is completed, it is determined whether to control the operation of the energy storage module based on the range of the electric energy output by the photovoltaic power generation module obtained by the energy storage module at each time node within the preset monitoring period, and when it is determined that the energy storage module is controlled to supply power to the load module, the ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is adjusted to a corresponding value; Or, when it is determined that the power supply is qualified, each power supply module is controlled to continue to operate using the current operating parameters.

2. The control method for photovoltaic power generation according to claim 1, characterized in that: The process of determining the load stability parameter is to determine the sum of the calculated power consumption of each power-consuming device as the total power consumption of the load module, and determine the standard deviation of the total power consumption of the load module at each time node within the preset monitoring period as the load stability parameter; The process of determining whether the power supply is qualified based on the load stability parameters includes: If the load stability parameter is less than or equal to the first preset load stability parameter, it is determined that the power supply is qualified; If the load stability parameter is less than or equal to the second preset load stability parameter and greater than the first preset load stability parameter, determining whether the power supply is qualified based on the interference impact parameter; If the load stability parameter is greater than the second preset load stability parameter, the power supply is determined to be abnormal, and the operation of each power generation module is controlled based on the power consumption change parameter.

3. The control method for photovoltaic power generation according to claim 2, characterized in that: The process of determining whether the power supply is qualified based on the interference impact parameters includes: The ratio of the average power consumption of each electrical device to the total power consumption of the load module is recorded as the interference impact parameter; If the interference impact parameter is less than or equal to the preset impact parameter, the power supply is determined to be qualified; If the interference impact parameter is greater than the preset impact parameter, the number of time nodes within the preset monitoring period obtained is adjusted to a corresponding value based on the interference impact parameter.

4. The control method for photovoltaic power generation according to claim 3, characterized in that: The number of time nodes within the preset monitoring period obtained is adjusted to a corresponding value based on the interference impact parameter, wherein: The increase in the number of time nodes obtained within the preset monitoring period is proportional to the interference impact parameter.

5. The control method for photovoltaic power generation according to claim 4, characterized in that: The process of controlling the operation of each power generation module based on the power consumption change parameters includes: Determine the power consumption change parameter, record the power consumption of the load module in a single preset monitoring cycle as the load power consumption, record the average value of the load power consumption in each historical preset monitoring cycle as the historical average power consumption, solve the ratio of the load power consumption in the current preset monitoring cycle to the historical average power consumption, and obtain the power consumption change parameter; When the power consumption change parameter is less than or equal to the preset change parameter, the photovoltaic power generation module is controlled to supply power to the load module; When the power consumption change parameter is greater than the preset change parameter, the photovoltaic power generation module and the wind power generation module are controlled to supply power to the load module, and the power supply ratio of the photovoltaic power generation module and the wind power generation module is corrected based on the acquired wind speed.

6. The control method for photovoltaic power generation according to claim 5, characterized in that: The power supply ratio is corrected based on the acquired wind speed, wherein the reduction of the power supply ratio is proportional to the wind speed.

7. The control method for photovoltaic power generation according to claim 6, characterized in that: When the adjustment for the power supply ratio is completed, whether to control the operation of the energy storage module is determined based on the range of the electric energy output by the photovoltaic power generation module obtained by the energy storage module at each time node within the preset monitoring period, including: If the range is less than or equal to the preset range, each power generation module is controlled to continue to operate using the current operating parameters; If the range is greater than the preset range, the energy storage module is controlled to supply power to the load module, and the ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is adjusted to a corresponding value based on the range and the power consumption change parameter.

8. The control method for photovoltaic power generation according to claim 7, characterized in that: Based on the range and power consumption change parameters, the ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is adjusted to a corresponding value, where: The ratio of the power supply of the photovoltaic power generation module to the power supply of the energy storage module is recorded as the photovoltaic storage ratio; The reduction in the light-to-storage ratio determined based on the range is proportional to the range.

9. The control method for photovoltaic power generation according to claim 8, characterized in that: The reduction in the solar-to-storage ratio determined based on the electricity consumption change parameter is proportional to the electricity consumption change parameter.

10. A control system using the control method for photovoltaic power generation according to any one of claims 1 to 9, characterized in that: include: A wind power generation module, which is used to convert output wind energy into electrical energy; Photovoltaic power generation modules, which are used to convert output solar energy into electrical energy; An energy storage module, which is connected to the wind power generation module and the photovoltaic power generation module respectively, and is used to store excess electric energy of the wind power generation module and the photovoltaic power generation module; A load module, which is connected to the wind power generation module, the photovoltaic power generation module and the energy storage module respectively, and is used to consume the electric energy of the wind power generation module, the photovoltaic power generation module and the energy storage module to meet the operation of various electrical equipment; A monitoring module, comprising an electric power monitoring meter connected to the load module for obtaining the power consumption of each electric device in the load module at a corresponding time node, an anemometer arranged adjacent to the wind power generation module for obtaining the wind speed, and a photovoltaic controller arranged between the photovoltaic power generation module and the energy storage module for obtaining the electric energy output by the photovoltaic power generation module; A data fitting module, which is connected to the monitoring module, is used to determine the total power consumption based on the power consumption of each power-consuming device, determine the load stability parameter based on the total power consumption, determine the interference impact parameter based on the power consumption of each power-consuming device and the total power consumption, determine the power consumption change parameter based on the power consumption of the load module, and determine the range based on the power output of the photovoltaic power generation module obtained by the energy storage module; The analysis module is respectively connected to the wind power generation module, the photovoltaic power generation module, the energy storage module, the monitoring module and the data fitting module, and is used to determine whether the power supply is qualified based on the load stability parameter and the interference impact parameter, and when the power supply is determined to be abnormal, control the operation of each power generation module based on the power consumption change parameter.

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