Control method of photovoltaic energy storage system

Abstract

The present invention provides a control method for a photovoltaic energy storage system and a computer-readable storage medium, wherein the control method includes: obtaining status information of a photovoltaic power generation system, the status information including a power generation state and a non-power generation state; obtaining power information of the energy storage system; when the photovoltaic power generation system is in a power generation state, generating a charging control instruction according to the power information of the energy storage system; wherein the charging control instruction includes: when the power of the energy storage system is less than a first threshold, controlling the photovoltaic power generation system to charge the energy storage system; when the power of the energy storage system is greater than or equal to the first threshold, controlling the photovoltaic power generation system to stop charging the energy storage system; the first threshold is the upper limit of the power threshold of the energy storage system. The control method for a photovoltaic energy storage system of the present invention enables the photovoltaic power generation system to charge the energy storage system in a timely manner and avoid overcharging.

Description

Technical Field

[0001] The present invention relates to the field of energy storage, and more specifically, to a control method for a photovoltaic energy storage system. Background Art

[0002] With the development of new energy, photovoltaic energy storage systems are used in many scenarios as an important means to develop zero-carbon energy systems.

[0003] During the operation of the photovoltaic energy storage system, if the charging and discharging strategy of the energy storage system is not properly controlled, the energy storage system will be damaged. Therefore, a reliable, stable and safe control strategy is more important for the photovoltaic energy storage system. Summary of the invention

[0004] The present invention provides a new technical solution for a control method of a photovoltaic energy storage system, which can at least solve the problem in the prior art that improper control of the charging and discharging strategy of the energy storage system may cause damage to the energy storage system.

[0005] According to a first aspect of the present invention, a control method for a photovoltaic energy storage system is provided, which is used to control a photovoltaic power generation system, an energy storage system and a power consumption system, and the control method comprises: Acquiring status information of the photovoltaic power generation system, wherein the status information includes a power generation status and a non-power generation status; Obtain power information of the energy storage system; When the photovoltaic power generation system is in a power generation state, a charging control instruction is generated according to the power information of the energy storage system; The charging control instruction includes: When the power of the energy storage system is less than a first threshold, controlling the photovoltaic power generation system to charge the energy storage system; When the power of the energy storage system is greater than or equal to a first threshold, controlling the photovoltaic power generation system to stop charging the energy storage system; The first threshold is an upper limit value of the energy storage system power threshold.

[0006] Furthermore, the control method further includes: Obtaining operating information of the power consumption system; Acquire the current power generation of the photovoltaic power generation system; Based on the working information of the power consumption system and the current power generation power of the photovoltaic power generation system, a power supply control instruction is generated to control the photovoltaic power generation system and / or the energy storage system to supply power to the power consumption system. The working information includes working status and working power, and the working status includes a required working status and a stopped working status.

[0007] Furthermore, the power supply control instruction includes: When the power consumption system is in a demand working state and the working power of the power consumption system is lower than the power generation power of the photovoltaic power generation system, the photovoltaic power generation system is controlled to supply power to the power consumption system through a first power and to supply power to the energy storage system through a second power. Wherein, the sum of the first power and the second power is not greater than the current power generation power of the photovoltaic power generation system.

[0008] Furthermore, the power supply control instruction also includes: When the power consumption system is in a demand working state and the working power of the power consumption system is higher than the power generation power of the photovoltaic power generation system, the photovoltaic power generation system and the energy storage system are controlled to jointly supply power to the power consumption system.

[0009] Furthermore, the control method further includes: When the power of the energy storage system is less than a second threshold, controlling the energy storage system to stop supplying power to the power consumption system; The second threshold is the lower limit of the power threshold of the energy storage system.

[0010] Furthermore, the control method further includes: Obtaining the operating temperature of the energy storage system; generating a first control strategy based on the operating temperature to control the photovoltaic power generation system to charge the energy storage system based on the first control strategy; A second control strategy is generated based on the operating temperature to control the energy storage system to supply power to the power consumption system based on the second control strategy.

[0011] Furthermore, the first control strategy includes: When the operating temperature is within a predetermined charging temperature range, controlling the photovoltaic power generation system to charge the energy storage system; When the operating temperature is outside the predetermined charging temperature range, the photovoltaic power generation system is controlled to stop charging the energy storage system.

[0012] Further, when the operating temperature is within a predetermined charging temperature range, controlling the photovoltaic power generation system to charge the energy storage system includes: The predetermined charging temperature range includes a first temperature range and a second temperature range, and the lowest value of the first temperature range is greater than the highest value of the second temperature range; When the operating temperature is within a first temperature range, controlling the photovoltaic power generation system to charge the energy storage system through a full voltage range; When the operating temperature is within the second temperature range, the photovoltaic power generation system is controlled to charge the energy storage system through a partial voltage interval. The partial voltage interval is a low voltage interval at the front of the full voltage interval.

[0013] Furthermore, the second control strategy includes: When the operating temperature is not within the predetermined discharge temperature range, the energy storage system is controlled to stop supplying power to the power consumption system.

[0014] According to a second aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the processor executes any of the control methods described above.

[0015] According to the control method for a photovoltaic energy storage system of the present invention, the control system obtains the status information of the photovoltaic power generation system, and can timely obtain whether the photovoltaic power generation system is in a power generation state or a non-power generation state. The control system obtains the power information of the energy storage system, which is convenient for charging and discharging the energy storage system. The control system generates a charging control instruction after obtaining information that the photovoltaic power generation system is in a normal state and the power of the energy storage system is lower than the upper limit of the power threshold. The control system controls the photovoltaic power generation system to charge the energy storage system based on the charging control instruction, and can charge the energy storage system in a timely manner. During the charging process, the control system obtains that the power of the energy storage system reaches the upper limit of the power threshold, and the control system controls the photovoltaic power generation system to stop charging the energy storage system based on the charging control instruction, which can avoid overcharging the energy storage system. Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0017] Figure 1 is a flow chart of a control method for a photovoltaic energy storage system according to an embodiment of the present invention; Figure 2 It is a connection diagram of a photovoltaic power generation system, an energy storage system and a power consumption system according to an embodiment of the present invention.

[0018] Reference numerals: 10. Photovoltaic power generation system; 20. Energy storage system; 30. Power consumption system. DETAILED DESCRIPTION

[0019] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0020] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0021] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0022] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0023] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0024] The following describes in detail the control method for the photovoltaic energy storage system 20 according to an embodiment of the present invention in conjunction with the accompanying drawings. The control method is used to control the photovoltaic power generation system 10, the energy storage system 20 and the power system 30. The power system 30 may be a lighting system, a monitoring device, an electrical device, a data center, etc.

[0025] like Figure 2 As shown, the control system can realize the control of the photovoltaic power generation system 10, the energy storage system 20 and the power consumption system 30 based on the control method.

[0026] It should be noted that the present invention does not limit the number of photovoltaic power generation systems 10, energy storage systems 20, and power consumption systems 30. For example, one photovoltaic power generation system 10 can be matched with multiple energy storage systems 20 and multiple power consumption systems 30, one photovoltaic power generation system 10 can be matched with one energy storage system 20 and one power consumption system 30, or one photovoltaic power generation system 10 can be matched with one energy storage system 20 and multiple power consumption systems 30.

[0027] like Figure 1 As shown, the control method for the photovoltaic energy storage system 20 according to an embodiment of the present invention includes: Step S1, obtaining status information of the photovoltaic power generation system 10, where the status information includes a power generation status and a non-power generation status.

[0028] That is to say, the control system obtains the status information of the photovoltaic power generation system 10 and can timely obtain whether the photovoltaic power generation system 10 is in a power generation state or a non-power generation state.

[0029] Step S2, obtaining power information of the energy storage system 20.

[0030] In other words, the control system obtains the power information of the energy storage system 20 to facilitate charging and discharging the energy storage system 20 .

[0031] Step S3, when the photovoltaic power generation system 10 is in the power generation state, a charging control instruction is generated according to the power information of the energy storage system 20. The charging control instruction includes: when the power of the energy storage system 20 is less than the first threshold, the photovoltaic power generation system 10 is controlled to charge the energy storage system 20; when the power of the energy storage system 20 is greater than or equal to the first threshold, the photovoltaic power generation system 10 is controlled to stop charging the energy storage system 20; the first threshold is the upper limit of the power threshold of the energy storage system 20.

[0032] That is, the control system generates a charging control instruction after obtaining information that the photovoltaic power generation system 10 is in a normal state and the power of the energy storage system 20 is lower than the upper limit of the power threshold. The control system controls the photovoltaic power generation system 10 to charge the energy storage system 20 based on the charging control instruction. In this way, the energy storage system 20 can be charged in a timely manner.

[0033] During the charging process, the control system obtains that the power of the energy storage system 20 reaches the upper limit of the power threshold, and the control system controls the photovoltaic power generation system 10 to stop charging the energy storage system 20 based on the charging control instruction. In this way, overcharging of the energy storage system 20 can be avoided.

[0034] In the above control method for the photovoltaic energy storage system 20, the control system obtains the status information of the photovoltaic power generation system 10, and can timely obtain whether the photovoltaic power generation system 10 is in a power generation state or a non-power generation state. The control system obtains the power information of the energy storage system 20 to facilitate charging and discharging the energy storage system 20. The control system generates a charging control instruction after obtaining the information that the photovoltaic power generation system 10 is in a normal state and the power of the energy storage system 20 is lower than the upper limit of the power threshold. The control system controls the photovoltaic power generation system 10 to charge the energy storage system 20 based on the charging control instruction, and can charge the energy storage system 20 in a timely manner. During the charging process, the control system obtains that the power of the energy storage system 20 reaches the upper limit of the power threshold, and the control system controls the photovoltaic power generation system 10 to stop charging the energy storage system 20 based on the charging control instruction, which can avoid overcharging the energy storage system 20.

[0035] In some embodiments of the present invention, the control method further includes: obtaining working information of the power system 30; obtaining the current power generation of the photovoltaic power generation system 10; and generating a power supply control instruction for controlling the photovoltaic power generation system 10 and / or the energy storage system 20 to supply power to the power system 30 based on the working information of the power system 30 and the current power generation of the photovoltaic power generation system 10. The working information includes working status and working power, and the working status includes a required working status and a stopped working status.

[0036] Based on the working information of the power consumption system 30 and the current power generation power of the photovoltaic power generation system 10, a power supply control instruction is generated to control the photovoltaic power generation system 10 and / or the energy storage system 20 to supply power to the power consumption system 30, so that the power consumption system 30 can be provided with power supply that meets the demand in a timely manner.

[0037] Specifically, there are two situations: Case 1 When the power system 30 is in the demand working state, and the working power of the power system 30 is lower than the power generation power of the photovoltaic power generation system 10, the photovoltaic power generation system 10 is controlled to supply power to the power system 30 through the first power, and to supply power to the energy storage system 20 through the second power. The sum of the first power and the second power is not greater than the current power generation power of the photovoltaic power generation system 10.

[0038] For example, the working power of the power system 30 is 200 W, and the current power generation power of the photovoltaic power generation system 10 is 300 W. The above control method enables the photovoltaic power generation system 10 to supply 200 W of power to the power system 30 and charge the energy storage system 20 with 100 W at the same time.

[0039] When the power generation power of the photovoltaic power generation system 10 is greater than the working power of the power consumption system 30, the photovoltaic power generation system 10 can be controlled to directly supply power to the power consumption system 30 through the first power (which can be the working power of the power consumption system 30), thereby improving the photoelectric utilization rate. Moreover, the photovoltaic power generation system 10 is controlled to charge the energy storage system 20 that has not reached the upper limit of the power threshold through the second power (which can be the remaining power generation power after subtracting the first power from the current power generation power), which can avoid the waste of electricity and efficiently utilize the electricity generated by the photovoltaic power generation system 10. It should be noted that the first power and the second power are not specifically limited here, as long as the sum of the first power and the second power is not greater than the current power generation power of the photovoltaic power generation system 10.

[0040] Case 2 When the power system 30 is in a demand working state and the working power of the power system 30 is higher than the power generation power of the photovoltaic power generation system 10 , the photovoltaic power generation system 10 and the energy storage system 20 are controlled to jointly supply power to the power system 30 .

[0041] For example, the working power of the power system 30 is 200 W, and the current power generation power of the photovoltaic power generation system 10 is 120 W. The above control method can realize that the photovoltaic power generation system 100 supplies 120 W to the power system 30, and the energy storage system 20 supplies 80 W to the power system 30.

[0042] When the power generation power of the photovoltaic power generation system 10 is less than the working power of the power consumption system 30, the current power generation power of the photovoltaic power generation system 10 plus the difference power (the power of the difference between the working power and the current power generation power) of the energy storage system 20 can be used to supply power to the power consumption system 30. In this way, the working requirements of the power consumption system 30 can be met to the greatest extent and the working stability of the power consumption system 30 can be increased.

[0043] It should be noted that there is no limitation on the power of the photovoltaic power generation system 10 and the energy storage system 20 , as long as the sum of the power of the photovoltaic power generation system 10 and the energy storage system 20 meets the working power of the power system 30 .

[0044] In this case, when the power generation of the photovoltaic power generation system 10 is zero, the power supply of the energy storage system 20 is entirely used to meet the power demand of the power consumption system 30 .

[0045] In some embodiments of the present invention, the control method further includes: when the power of the energy storage system 20 is less than a second threshold, controlling the energy storage system 20 to stop supplying power to the power consumption system 30. The second threshold is a lower limit value of the power threshold of the energy storage system 20. The power of the energy storage system 20 is lower than the lower power threshold of the energy storage system 20, indicating that the energy storage system 20 is easily in a feeding state. If the energy storage is still supplying power, it is easy to cause damage to the energy storage system 20. At this time, the control system controls the energy storage system 20 to stop supplying power to the power consumption system 30. In this way, the energy storage system 20 can be better protected.

[0046] In some embodiments of the present invention, the control method also includes: obtaining the operating temperature of the energy storage system 20; generating a first control strategy based on the operating temperature to control the photovoltaic power generation system 10 to charge the energy storage system 20 based on the first control strategy; generating a second control strategy based on the operating temperature to control the energy storage system 20 to supply power to the power consumption system 30 based on the second control strategy. The operating temperature of the energy storage system 20 has a great influence on the energy storage system 20. The control system controls the photovoltaic power generation system 10 to charge the energy storage system 20 under the first control strategy (at a suitable operating temperature), and controls the energy storage system 20 to supply power to the power consumption system 30 under the second control strategy (at a suitable operating temperature). In this way, the service life of the energy storage system 20 can be increased and the safety risk can be reduced.

[0047] Among them, the first control strategy includes: when the operating temperature is within the predetermined charging temperature range, controlling the photovoltaic power generation system 10 to charge the energy storage system 20; when the operating temperature is not within the predetermined charging temperature range, controlling the photovoltaic power generation system 10 to stop charging the energy storage system 20.

[0048] For example, the preset charging temperature range is -20 degrees to 60 degrees, that is, the safe temperature range of the energy storage system 20 is -20 degrees to 60 degrees. When the operating temperature is within the preset charging temperature range of -20 degrees to 60 degrees, the photovoltaic power generation system 10 charges the energy storage system 20. When the operating temperature is not within the preset charging temperature range of -20 degrees to 60 degrees, the photovoltaic power generation system 10 stops charging the energy storage system 20.

[0049] In this way, it is possible to avoid the situation where the photovoltaic power generation system 10 charges the energy storage system 20 in an overly high temperature environment or an overly low temperature environment, thereby damaging the energy storage system 20 , thereby improving the service life of the energy storage system 20 and increasing the safety of the energy storage system 20 .

[0050] It should be noted that the above charging temperature range is only an optional example, and the predetermined charging temperature range may also be -30 degrees to 50 degrees, etc., which should be understood to be within the scope of the present invention.

[0051] Further, when the operating temperature is within the predetermined charging temperature range, controlling the photovoltaic power generation system 10 to charge the energy storage system 20 includes: the predetermined charging temperature range includes a first temperature range and a second temperature range, and the lowest value of the first temperature range is greater than the highest value of the second temperature range; when the operating temperature is within the first temperature range, controlling the photovoltaic power generation system 10 to charge the energy storage system 20 through the full voltage range; when the operating temperature is within the second temperature range, controlling the photovoltaic power generation system 10 to charge the energy storage system 20 through a partial voltage range. The partial voltage range is a low voltage range at the front of the full voltage range.

[0052] For example, the first temperature range is 0 degrees to 60 degrees (excluding 0 degrees), and the corresponding full voltage range is 2.1V to 3.95V; the second temperature range is -20 degrees to 0 degrees (including 0 degrees), and the corresponding partial voltage range is 2.1V to 3.6V. High-voltage charging in a low-temperature environment will cause significant damage to the energy storage system 20, which may cause a short circuit in the energy storage system 20 and affect the service life of the energy storage system 20.

[0053] Within the first temperature range, the state of the energy storage system 20 is relatively good, and there are not too many restrictions on the charging voltage (the photovoltaic power generation system 10 can be charged using the full voltage range). The photovoltaic power generation system 10 can charge the energy storage system 20 with high voltage, and can charge the energy storage system 20 faster, thereby improving the charging efficiency.

[0054] In the second temperature range, the maximum value of the charging voltage is limited (the photovoltaic power generation system 10 can only use a part of the voltage range for charging), so as to better protect the energy storage system 20 and reduce safety risks.

[0055] It should be noted that there is no limitation on the first temperature range, the second temperature range, the full voltage range and the partial voltage range, which can be determined according to the specific characteristics of the energy storage system 20 .

[0056] Specifically, the second control strategy includes: when the operating temperature is not within the predetermined discharge temperature range, controlling the energy storage system 20 to stop supplying power to the power consumption system 30 .

[0057] For example, the predetermined discharge temperature range is -40 degrees to 60 degrees. When the operating temperature is not within this temperature range, the energy storage system 20 is controlled to stop supplying power to the power consumption system 30. In this way, the energy storage system 20 can be better protected, and damage caused by power supply in an overly high temperature environment or an overly low temperature environment can be avoided, thereby increasing the service life of the energy storage system 20.

[0058] It should be noted that the above discharge temperature range is only an optional example, and the predetermined discharge temperature range may also be -50 degrees to 50 degrees, etc., which should be understood to be within the scope of the present invention.

[0059] Next, a computer-readable storage medium according to an embodiment of the present invention is described.

[0060] The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by the processor, the processor executes the control method as described above.

[0061] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A control method for a photovoltaic energy storage system, used to control a photovoltaic power generation system, an energy storage system and a power consumption system, characterized in that: The control method comprises: Acquiring status information of the photovoltaic power generation system, wherein the status information includes a power generation status and a non-power generation status; Obtain power information of the energy storage system; When the photovoltaic power generation system is in a power generation state, a charging control instruction is generated according to the power information of the energy storage system; The charging control instruction includes: When the power of the energy storage system is less than a first threshold, controlling the photovoltaic power generation system to charge the energy storage system; When the power of the energy storage system is greater than or equal to a first threshold, controlling the photovoltaic power generation system to stop charging the energy storage system; The first threshold is an upper limit value of the energy storage system power threshold.

2. The control method for a photovoltaic energy storage system according to claim 1, characterized in that: The control method further comprises: Obtaining operating information of the power consumption system; Acquire the current power generation of the photovoltaic power generation system; Based on the working information of the power consumption system and the current power generation power of the photovoltaic power generation system, a power supply control instruction is generated to control the photovoltaic power generation system and / or the energy storage system to supply power to the power consumption system. The working information includes working status and working power, and the working status includes a required working status and a stopped working status.

3. The control method of the photovoltaic energy storage system according to claim 2, characterized in that: The power supply control instruction includes: When the power consumption system is in a demand working state and the working power of the power consumption system is lower than the power generation power of the photovoltaic power generation system, the photovoltaic power generation system is controlled to supply power to the power consumption system through a first power and to supply power to the energy storage system through a second power. The sum of the first power and the second power is not greater than the current power generation power of the photovoltaic power generation system.

4. The control method of the photovoltaic energy storage system according to claim 3, characterized in that: The power supply control instruction also includes: When the power consumption system is in a demand working state and the working power of the power consumption system is higher than the power generation power of the photovoltaic power generation system, the photovoltaic power generation system and the energy storage system are controlled to jointly supply power to the power consumption system.

5. The control method of the photovoltaic energy storage system according to claim 1, characterized in that: The control method further comprises: When the power of the energy storage system is less than a second threshold, controlling the energy storage system to stop supplying power to the power consumption system; The second threshold is the lower limit of the power threshold of the energy storage system.

6. The control method of the photovoltaic energy storage system according to claim 1, characterized in that: The control method further comprises: Obtaining the operating temperature of the energy storage system; generating a first control strategy based on the operating temperature to control the photovoltaic power generation system to charge the energy storage system based on the first control strategy; A second control strategy is generated based on the operating temperature to control the energy storage system to supply power to the power consumption system based on the second control strategy.

7. The control method of the photovoltaic energy storage system according to claim 6, characterized in that: The first control strategy includes: When the operating temperature is within a predetermined charging temperature range, controlling the photovoltaic power generation system to charge the energy storage system; When the operating temperature is outside the predetermined charging temperature range, the photovoltaic power generation system is controlled to stop charging the energy storage system.

8. The control method of the photovoltaic energy storage system according to claim 7, characterized in that: When the operating temperature is within the predetermined charging temperature range, controlling the photovoltaic power generation system to charge the energy storage system comprises: The predetermined charging temperature range includes a first temperature range and a second temperature range, and the lowest value of the first temperature range is greater than the highest value of the second temperature range; When the operating temperature is within a first temperature range, controlling the photovoltaic power generation system to charge the energy storage system through a full voltage range; When the operating temperature is within the second temperature range, the photovoltaic power generation system is controlled to charge the energy storage system through a partial voltage interval. The partial voltage interval is a low voltage interval at the front of the full voltage interval.

9. The control method of the photovoltaic energy storage system according to claim 8, characterized in that: The second control strategy includes: When the operating temperature is not within the predetermined discharge temperature range, the energy storage system is controlled to stop supplying power to the power consumption system.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the processor executes the control method according to any one of claims 1 to 9.

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