Method and system for controlling intelligent charging and discharging of distributed energy storage system

Abstract

The invention relates to the technical field of distributed energy storage, and discloses a control method and system for intelligent charging and discharging of a distributed energy storage system. Power parameters of the transformer are collected, real-time load data are calculated, and the working load time period is judged; setting the maximum charging power, the maximum discharging power, the discharging starting power value and the discharging stopping power value, and calculating the chargeable amount based on the real-time load data; and determining whether the distributed energy storage system is a first working condition or a second working condition according to the working load time period, and if the working condition is the first working condition, adjusting the charging power according to the chargeable amount and the maximum charging power of the distributed energy storage system, and if the working condition is the second working condition, adjusting the working state and the discharge power of the distributed energy storage system according to the original power value, the discharge starting power value, the maximum discharge power or the real-time load data and the discharge stopping power value. The problem that charging and discharging of an existing distributed energy storage system cannot respond to load fluctuation in time is solved.

Description

Technical Field

[0001] The present invention relates to the field of distributed energy storage technology, and in particular to a control method and system for intelligent charging and discharging of a distributed energy storage system. Background Art

[0002] With the widespread application of distributed energy, the role of distributed energy storage systems in power systems is becoming increasingly important. They can store excess electrical energy and release it when needed, thereby reducing peak loads and filling valleys and improving power quality.

[0003] Traditional charging and discharging control methods are mostly based on fixed schedules or simple threshold judgments, and fail to fully consider the real-time changes in the actual load. The load often fluctuates frequently and irregularly. Existing control methods are difficult to respond to these load fluctuations quickly and effectively while ensuring the stable operation of the energy storage system. Excessive charging and discharging or untimely charging and discharging may occur, affecting the life and performance of the energy storage equipment. It also causes the charging and discharging of the energy storage system to not match the load demand well, affecting the overall efficiency of the system and lacking intelligence. Summary of the invention

[0004] The present invention provides a control method and system for intelligent charging and discharging of a distributed energy storage system, so as to solve the problem that the charging and discharging of the existing distributed energy storage system cannot respond to load fluctuations in a timely manner.

[0005] In order to achieve the above object, the present invention is implemented by the following technical solutions: In a first aspect, the present invention provides a method for controlling intelligent charging and discharging of a distributed energy storage system, comprising the following steps: Step 1: Collect the power parameters of the distributed energy storage system transformer and calculate the real-time load data; Step 2: Obtain the workload period of the distributed energy storage system, and determine whether the distributed energy storage system is in the first operating condition or the second operating condition according to the workload period; The obtaining of the workload period of the distributed energy storage system comprises: obtaining clock data of the distributed energy storage system, and determining the workload period of the distributed energy storage system in combination with preset load period parameters; The load period parameters include the first valley start time, the first valley end time, the second valley start time, the second valley end time, the peak start time and the peak end time; Determining whether the distributed energy storage system is in the first operating condition or the second operating condition according to the workload period includes: When the distributed energy storage system is in the period from the start time of the first valley to the end time of the second valley, it is determined as the first operating condition; When the distributed energy storage system is in the peak start time to the peak end time, it is determined as the second operating condition; Step 3: If it is the first working condition, the maximum charging power of the distributed energy storage system is set, the chargeable capacity is calculated based on the real-time load data, and the charging work of the distributed energy storage system is adjusted according to the chargeable capacity and the maximum charging power; If it is the second working condition, the discharge starting power value of the distributed energy storage system is set, and the discharge work of the distributed energy storage system is regulated according to the comparison result between the power parameter and the discharge starting power value.

[0006] Furthermore, the power parameters include the charging and discharging power value and the original power value, and the real-time load data is calculated by the following formula: ; in, Indicates real-time load data; Indicates the original power value; Indicates the charge and discharge power value.

[0007] Further, the calculating of the chargeable amount based on the real-time load data includes: calculating the chargeable amount based on the real-time load data in combination with a preset transformer load protection setting value and a charging power buffer value; The chargeable amount is calculated by the following formula: ; in, Indicates the chargeable capacity; Indicates the transformer load protection setting value; Indicates the charging power buffer value.

[0008] Furthermore, the charging operation of adjusting the distributed energy storage system according to the chargeable amount and the maximum charging power includes: When the chargeable amount is greater than the maximum charging power and the chargeable amount is less than 0, the distributed energy storage system is charged according to the power of the chargeable amount; When the chargeable amount is less than the maximum charging power, the distributed energy storage system is charged according to the maximum charging power.

[0009] Furthermore, regulating the discharge operation of the distributed energy storage system according to the comparison result between the power parameter and the discharge start power value includes: When the original power value is less than the discharge start power value, the distributed energy storage system is put into standby state; When the original power value is greater than the discharge start power value, the dischargeable amount is calculated based on the real-time load data combined with the preset discharge start power value, and then the discharge power of the distributed energy storage system is adjusted in combination with the preset maximum discharge power, or the working state of the distributed energy storage system is adjusted according to the real-time load data and the preset discharge stop power value; The dischargeable amount is calculated by the following formula: ; in, Indicates the discharge capacity; Indicates the discharge starting power value.

[0010] Furthermore, the step of adjusting the discharge power of the distributed energy storage system in combination with the preset maximum discharge power includes: When the dischargeable amount is greater than 0 and less than the maximum discharge power, the distributed energy storage system is discharged according to the power of the dischargeable amount; When the dischargeable amount is greater than the maximum discharge power, the distributed energy storage system is discharged according to the maximum discharge power; The adjusting the working state of the distributed energy storage system according to the real-time load data and the preset discharge stop power value includes: when the real-time load data is less than the discharge stop power value, the distributed energy storage system is in a standby state.

[0011] Furthermore, the method further includes step 4: if the original power value during the charging process of the distributed energy storage system is greater than the transformer load protection setting value, the distributed energy storage system will be in a standby state, and when the original power value is less than the transformer load protection setting value, the method returns to step 2 to readjust the charging and discharging power and the working state; If the original power value during the discharge process of the distributed energy storage system is less than the discharge stop power value, the distributed energy storage system will be in standby state. When the original power value is greater than the discharge start power value, return to step 2 to readjust the charging and discharging power and working state.

[0012] In a second aspect, the present invention also provides a control system for intelligent charging and discharging of a distributed energy storage system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the above methods when executing the computer program.

[0013] Beneficial effects: The present invention provides a control method and system for intelligent charging and discharging of a distributed energy storage system. Based on factors such as power load and peak and valley time periods, the system can accurately calculate the chargeable and dischargeable amount. When the load and peak and valley time periods change, the system can adjust the charge and discharge strategy in a short time to ensure that the charge and discharge amount always matches the load demand. This precise control makes energy utilization more efficient and reduces unnecessary energy waste. By intelligently charging and discharging according to the load quota, it has significant advantages and practical effects in accurately calculating the charge and discharge quota, stabilizing power supply, extending equipment life, saving energy and reducing emissions, and improving economic benefits. It can achieve real-time matching of energy storage system charging and discharging with load demand and improve the overall operating efficiency of the system. It can effectively respond to frequent load fluctuations, while ensuring the stable operation of the energy storage system, and extend the service life of the energy storage equipment. It solves the problem that the existing distributed energy storage system charging and discharging cannot respond to load fluctuations in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention is a flow chart of a method for controlling intelligent charging and discharging of a distributed energy storage system. DETAILED DESCRIPTION

[0015] The technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate quantity restrictions, but indicate the existence of at least one. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0017] See also Figure 1 The present application provides a method for controlling intelligent charging and discharging of a distributed energy storage system, comprising the following steps: Step 1: Collect the power parameters of the distributed energy storage system transformer and calculate the real-time load data; Among them, the power parameters include the charging and discharging power value and the original power value. The real-time load data is calculated by the following formula: ; in, Indicates real-time load data; Indicates the original power value; Indicates the charge and discharge power value.

[0018] In this embodiment, the power parameters of the acquisition transformer are respectively , ,but .

[0019] Step 2: Obtain the workload period of the distributed energy storage system, and determine whether the distributed energy storage system is in the first operating condition or the second operating condition according to the workload period; Specifically, the load period parameters include the start time of the first valley, the end time of the first valley, the start time of the second valley, the end time of the second valley, the start time of the peak and the end time of the peak. When the distributed energy storage system is in the period from the start time of the first valley to the end time of the second valley, it is determined to be the first operating condition. When the distributed energy storage system is in the period from the start time of the peak to the end time of the peak, it is determined to be the second operating condition.

[0020] The start time of the first valley hour is set to 0:01, and the end time is set to 6:00. The start time of the second valley hour is set to 14:01, and the end time is set to 18:00. The start time of the peak hour is set to 11:01, and the end time of the peak hour is set to 14:00. In this embodiment, the system clock acquisition is performed twice to reflect the first working condition and the second working condition; The first time the system clock is collected is 14:30, which is between the start time of the second valley time and the end time of the second valley time, which is the first working condition; The second time the system clock is collected is 12:30, which means that this time is from the peak start time to the peak end time, which is the second working condition.

[0021] Step 3: If it is the first working condition, the maximum charging power of the distributed energy storage system is set, the chargeable capacity is calculated based on the real-time load data, and the charging work of the distributed energy storage system is adjusted according to the chargeable capacity and the maximum charging power; If it is the second working condition, the discharge starting power value of the distributed energy storage system is set, and the discharge work of the distributed energy storage system is regulated according to the comparison result between the power parameter and the discharge starting power value.

[0022] First working condition: Based on real-time load data, the chargeable capacity is calculated in combination with the preset transformer load protection setting value and charging power buffer value; The chargeable capacity is calculated using the following formula: ; in, Indicates the chargeable capacity; Indicates the transformer load protection setting value; Indicates the charging power buffer value.

[0023] The maximum charging power of the distributed energy storage system is -100KW, the maximum discharging power is 100KW, the discharging start power is 15KW, and the discharging stop power is 8KW. The real-time load data is 350KW, the preset transformer load protection setting value is 400KW, and the charging power buffer value is 5KW. The chargeable capacity is: ; At this time, the chargeable capacity is -45KW, and the maximum charging power set for the distributed energy storage system is -100KW. At this time, the chargeable capacity is greater than the maximum charging power and the chargeable capacity is less than 0. The distributed energy storage system is charged according to the power of the chargeable capacity. The situation where the chargeable amount is less than the maximum charging power is not met, and the distributed energy storage system is charged according to the maximum charging power.

[0024] The second time the system clock is collected, it is the second working condition, the original power value is 350KW, and the discharge start power value is 15KW. The original power value is not less than the discharge start power value, and the distributed energy storage system is in standby state; At this time, if the original power value is greater than the discharge start power value, the dischargeable amount is calculated based on the real-time load data combined with the preset discharge start power value, and then the discharge power of the distributed energy storage system is adjusted in combination with the preset maximum discharge power, or the working state of the distributed energy storage system is adjusted according to the real-time load data and the preset discharge stop power value; The discharge capacity can be calculated by the following formula: ; in, Indicates the discharge capacity; Indicates the discharge starting power value; Adjusting the discharge power of the distributed energy storage system in combination with the preset maximum discharge power includes: when the dischargeable amount is greater than 0 and the dischargeable amount is less than the maximum discharge power, discharging the distributed energy storage system according to the power of the dischargeable amount; When the dischargeable amount is greater than the maximum discharge power, the distributed energy storage system is discharged according to the maximum charging power; Adjusting the working state of the distributed energy storage system according to the real-time load data and the preset discharge stop power value includes: when the real-time load data is less than the discharge stop power value, placing the distributed energy storage system in a standby state; At this time, the dischargeable capacity is 335KW, the maximum discharge power is 100KW, the real-time load is 350KW, and the discharge stop power value is 8KW. The dischargeable capacity does not meet the situation that it is greater than 0 and less than the maximum discharge power, nor does it meet the situation that the real-time load data is less than the discharge stop power value. If the dischargeable capacity is greater than the maximum discharge power, the distributed energy storage system will be discharged according to the maximum discharge power.

[0025] Step 4: If the original power value during the charging process of the distributed energy storage system is greater than the transformer load protection setting value, the distributed energy storage system will be in standby state. When the original power value is less than the transformer load protection setting value, return to step 2 to readjust the charging and discharging power and working state.

[0026] If the original power value during the discharge process of the distributed energy storage system is less than the discharge stop power value, the distributed energy storage system will be in standby state. When the original power value is greater than the discharge start power value, return to step 2 to readjust the charging and discharging power and working state.

[0027] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A method for controlling intelligent charging and discharging of a distributed energy storage system, characterized in that: The steps include: Step 1: Collect the power parameters of the distributed energy storage system transformer and calculate the real-time load data; Step 2: Obtain the workload period of the distributed energy storage system, and determine whether the distributed energy storage system is in the first operating condition or the second operating condition according to the workload period; The obtaining of the workload period of the distributed energy storage system comprises: obtaining clock data of the distributed energy storage system, and determining the workload period of the distributed energy storage system in combination with preset load period parameters; The load period parameters include the first valley start time, the first valley end time, the second valley start time, the second valley end time, the peak start time and the peak end time; Determining whether the distributed energy storage system is in the first operating condition or the second operating condition according to the workload period includes: When the distributed energy storage system is in the period from the start time of the first valley to the end time of the second valley, it is determined as the first operating condition; When the distributed energy storage system is in the peak start time to the peak end time, it is determined as the second operating condition; Step 3: If it is the first working condition, the maximum charging power of the distributed energy storage system is set, the chargeable capacity is calculated based on the real-time load data, and the charging work of the distributed energy storage system is adjusted according to the chargeable capacity and the maximum charging power; If it is the second working condition, the discharge starting power value of the distributed energy storage system is set, and the discharge work of the distributed energy storage system is regulated according to the comparison result between the power parameter and the discharge starting power value.

2. The control method for intelligent charging and discharging of a distributed energy storage system according to claim 1, characterized in that: The power parameters include the charging and discharging power value and the original power value. The real-time load data is calculated by the following formula: ； in, Indicates real-time load data; Indicates the original power value; Indicates the charge and discharge power value.

3. The control method for intelligent charging and discharging of a distributed energy storage system according to claim 2, characterized in that: The calculating of the chargeable amount based on the real-time load data comprises: calculating the chargeable amount based on the real-time load data in combination with a preset transformer load protection setting value and a charging power buffer value; The chargeable amount is calculated by the following formula: ； in, Indicates the chargeable capacity; Indicates the transformer load protection setting value; Indicates the charging power buffer value.

4. The control method for intelligent charging and discharging of a distributed energy storage system according to claim 3 is characterized in that: The charging operation of adjusting the distributed energy storage system according to the chargeable amount and the maximum charging power includes: When the chargeable amount is greater than the maximum charging power and the chargeable amount is less than 0, the distributed energy storage system is charged according to the power of the chargeable amount; When the chargeable amount is less than the maximum charging power, the distributed energy storage system is charged according to the maximum charging power.

5. The control method for intelligent charging and discharging of a distributed energy storage system according to claim 3 is characterized in that: The method of regulating the discharge operation of the distributed energy storage system according to the comparison result between the power parameter and the discharge start power value includes: When the original power value is less than the discharge start power value, the distributed energy storage system is put into standby state; When the original power value is greater than the discharge start power value, the dischargeable amount is calculated based on the real-time load data combined with the preset discharge start power value, and then the discharge power of the distributed energy storage system is adjusted in combination with the preset maximum discharge power, or the working state of the distributed energy storage system is adjusted according to the real-time load data and the preset discharge stop power value; The dischargeable amount is calculated by the following formula: ； in, Indicates the discharge capacity; Indicates the discharge starting power value.

6. The control method for intelligent charging and discharging of a distributed energy storage system according to claim 5, characterized in that: The step of adjusting the discharge power of the distributed energy storage system in combination with the preset maximum discharge power includes: When the dischargeable amount is greater than 0 and less than the maximum discharge power, the distributed energy storage system is discharged according to the power of the dischargeable amount; When the dischargeable amount is greater than the maximum discharge power, the distributed energy storage system is discharged according to the maximum discharge power; The adjusting the working state of the distributed energy storage system according to the real-time load data and the preset discharge stop power value includes: when the real-time load data is less than the discharge stop power value, the distributed energy storage system is in a standby state.

7. The control method for intelligent charging and discharging of a distributed energy storage system according to claim 5, characterized in that: The method further includes step 4: if the original power value during the charging process of the distributed energy storage system is greater than the transformer load protection setting value, the distributed energy storage system will be in a standby state. When the original power value is less than the transformer load protection setting value, the system returns to step 2 to readjust the charging and discharging power and the working state. If the original power value during the discharge process of the distributed energy storage system is less than the discharge stop power value, the distributed energy storage system will be in standby state. When the original power value is greater than the discharge start power value, return to step 2 to readjust the charging and discharging power and working state.

8. A control system for intelligent charging and discharging of a distributed energy storage system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method described in any one of claims 1 to 7 are implemented.

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