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KR-20260063579-A - Smart power control management system and power compensation device for each string for grid-connected solar power generation facilities

KR20260063579AKR 20260063579 AKR20260063579 AKR 20260063579AKR-20260063579-A

Abstract

The present invention relates to a string-specific smart power control management system for a grid-connected photovoltaic power generation facility, and more specifically, to a string-specific smart power control management system for a grid-connected photovoltaic power generation facility that controls power transmission according to power produced from a solar cell string and load power. The objective of the present invention is to operate the photovoltaic system more efficiently by adding a battery and a plurality of switch modules between a solar cell string module and a load end, controlling the switch modules according to the power generated by each solar cell string module and the load power required by the load end, charging the battery with the generated power when the generated power is greater than the load power, and supplementing with battery power when the generated power is less than the load power.

Inventors

  • 신동찬

Assignees

  • 한국그린에너지(주)

Dates

Publication Date
20260507
Application Date
20241030

Claims (11)

  1. A plurality of solar cell string modules, each having at least one solar cell connected in series; A battery that charges power supplied from the plurality of solar cell string modules or supplies power to the plurality of solar cell string modules; A plurality of switch modules connected between the output terminals of the plurality of solar cell string modules, the battery, and the load terminals to be turned on and off; and An integrated control module that predicts power generation and load power and controls the plurality of switch modules according to the predicted power generation and load power; String-based smart power control management system for grid-connected photovoltaic power generation facilities.
  2. In paragraph 1, The above integrated control module is, A string individual power measuring unit that measures the power value supplied from each of the plurality of solar cell string modules; A power generation storage unit that stores power generation information supplied from the plurality of solar cell string modules and solar irradiance information corresponding to the power generation information; A load power storage unit that stores load power information consumed at the load end and environmental information corresponding to the load power; A power generation prediction unit that calculates a proportionality coefficient based on the power generation information and the solar radiation information, and calculates the predicted power generation based on the predicted solar radiation information provided by the Korea Meteorological Administration and the proportionality coefficient; A load power prediction unit that clusters the load power information according to the environment information based on the load power information and the environment information, and calculates the predicted load power using the predicted environment information provided by the Korea Meteorological Administration and the clustered data; and A string individual control unit that calculates required power based on the predicted power generation and predicted load power, selects the plurality of solar cell string modules according to the required power, and controls the plurality of switch modules. A string-based smart power control management system for grid-connected photovoltaic power generation facilities characterized by
  3. In paragraph 2, The above environmental information is, Includes at least one of time information, day of the week information, and seasonal information A string-based smart power control management system for grid-connected photovoltaic power generation facilities characterized by
  4. In paragraph 2, The above string individual control unit is, If the above predicted generation power is greater than the above predicted load power, Controlling the plurality of switch modules to transmit power generated from the plurality of solar cell string modules to the load side. A string-based smart power control management system for grid-connected photovoltaic power generation facilities characterized by
  5. In paragraph 4, The above string individual control unit is, Calculate the average value of the above predicted power generation, and Selecting solar cell string modules to be activated to cover the predicted load power in order of proximity to the average value, and controlling the plurality of switch modules so that the selected solar cell string modules transmit power to the load terminal. A string-based smart power control management system for grid-connected photovoltaic power generation facilities characterized by
  6. In paragraph 5, The above string individual control unit is, Controlling the plurality of switch modules so that the unselected solar cell string module supplies power to the battery. A string-based smart power control management system for grid-connected photovoltaic power generation facilities characterized by
  7. In paragraph 4, The above string individual control unit is, Calculate the change in the predicted power generation amount above, and Selecting solar cell string modules to be activated to cover the predicted load power in order of decreasing change amount, and controlling the plurality of switch modules so that the selected solar cell string modules transmit power to the load terminal. A string-based smart power control management system for grid-connected photovoltaic power generation facilities characterized by
  8. In Paragraph 7, The above string individual control unit is, Controlling the plurality of switch modules so that the unselected solar cell string module supplies power to the battery. A string-based smart power control management system for grid-connected photovoltaic power generation facilities characterized by
  9. In paragraph 2, The above string individual control unit is, If the above predicted generation power is smaller than the above predicted load power, Controlling the plurality of switch modules to transmit power generated from the plurality of solar cell string modules and power supplied from the battery to the load side. A string-based smart power control management system for grid-connected photovoltaic power generation facilities characterized by
  10. In Paragraph 9, The above string individual control unit is, Calculate the average value of the power generated from the plurality of solar cell string modules above, and Controlling the plurality of switch modules so that a solar cell string module outputting power smaller than the above average value is connected to the battery. A string-based smart power control management system for grid-connected photovoltaic power generation facilities characterized by
  11. In Paragraph 10, The above string individual control unit is, If the power generated by the battery is less than the power of the solar cell string module generating the smallest power among the plurality of solar cell string modules, Controlling the plurality of switch modules so that all of the plurality of solar cell string modules are connected to the load terminal. A string-based smart power control management system for grid-connected photovoltaic power generation facilities characterized by

Description

Smart power control management system and power compensation device for each string for grid-connected solar power generation facilities The present invention relates to a string-specific smart power control management system and a power compensation device for a grid-connected photovoltaic power generation facility, and more specifically, to a string-specific smart power control management system and a power compensation device for a grid-connected photovoltaic power generation facility that controls power transmission according to power produced from a solar cell string and load power. In general, solar power generation has the disadvantage of low power production efficiency compared to its high generation cost. However, as environmental demands for a reduction in fossil energy and pollution-free environments increase, much research is currently being conducted to improve the efficiency of solar power generation. Currently, the proportion of electrical energy that can be converted from the sun through solar cells is only about 15–20% of the total solar energy. Specifically, since the output of a solar cell that generates solar power is very small, multiple solar cells are connected in series to form a photovoltaic module (PV Module) in order to obtain the required output, and the said solar cell modules are connected again in series or parallel to form a photovoltaic array (PV Array). The voltage of a solar cell array is proportional to the number of series-connected solar cell modules, and the current of a solar cell array is proportional to the number of parallel-connected lines. On the other hand, solar power generation devices face difficulties in providing a stable electricity supply compared to other power generation methods because the output of the solar cells varies depending on the surrounding environment. In other words, solar power generation devices have the characteristic that the voltage and current of the solar cells change non-linearly depending on surrounding conditions such as solar irradiance, temperature, and clouds. To address the low efficiency and unstable power supply of these solar cells, the most fundamental solution is to improve efficiency by enhancing the performance of the solar cells themselves; however, significant improvement is difficult with current technology. Therefore, compensation is required for voltage and current that vary non-linearly depending on surrounding environmental factors such as solar irradiance, temperature, and clouds. Additionally, a method is needed to utilize the generated power more efficiently when the solar cell's output exceeds the required load power. FIG. 1 is a configuration diagram showing the configuration of a string-specific smart power control management system for a grid-connected photovoltaic power generation facility according to an embodiment of the present invention. FIG. 2 is a configuration diagram showing the configuration of an integrated control module according to an embodiment of the present invention. The objects, features, and advantages of the present invention described above will become more apparent through the following embodiments in connection with the accompanying drawings. The specific structural or functional descriptions below are merely illustrative for the purpose of explaining other embodiments of the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms and should not be interpreted as being limited to the embodiments described in this specification or application. Since embodiments according to the concept of the present invention may be subject to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Terms such as "first" and/or "second" may be used to describe various components, but said components are not limited to said terms. The above terms may be used solely for the purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, such that the first component may be named the second component, and similarly, the second component may be named the first component. When it is stated that a component is connected to or coupled with another component, it should be understood that it may be directly connected to or coupled with that other component, or that there may be other components in between. Conversely, when it is stated that a component is directly connected to or coupled with another component, it should be understood that t