Rapid self-identification method of current detection module and energy storage system

Abstract

The invention provides a rapid self-identification method of a current detection module and an energy storage system, which are applied to the technical field of energy storage systems, and the rapid self-identification process comprises the following steps: when the output of two power lines is 0, recording the wiring loop power P1 and P2; the output of the line L1 is A, the output of the line L2 is 0, and the power of the wiring loop is P1'and P2 '; if P1 '-P1 is A, the two power lines are connected with the current detection module in a positive sequence; if P2 '-P2 is A, the two power lines are connected with the current detection module in a reverse sequence; and the connection direction of the wiring ring is judged according to the connection mode of the two power lines and the current detection module. The judgment logic of the self-recognition process is more concise, the algorithm execution process consumes shorter time, the recognition process does not need to be shut down and restarted, and rapid self-recognition of the current detection module can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage systems, and in particular relates to a rapid self-identification method of a current detection module and an energy storage system. Background Art

[0002] At present, the existing solar energy storage system includes: PV modules, energy storage inverters, batteries, loads, current sensors and power grids, etc. The current sensor is used to collect the current point on the grid side. During operation, the operator or end user is required to pass the power line through the current sensor magnetic ring. At present, the manufacturer will give guidance on the ring in the operating instructions. After the system is powered on, if an error is detected, a reminder will be reported that the current sensor magnetic ring has failed to be connected. The user must turn off the power and operate the experiment again, which is cumbersome. Therefore, it is necessary to propose further solutions to the above problems.

[0003] The Chinese invention patent with the announcement number CN113659619B discloses a self-identification method for an energy storage system and a current detection module, wherein the self-identification method comprises the following steps: at a first moment, the output power of the energy storage inverter is recorded as Pout, and the powers on the two power lines passing through the magnetic ring of the current detection module are respectively and ; At the second moment, the output power of the energy storage inverter is recorded as Pout', and the power on the two power lines passing through the magnetic ring of the current detection module is and ;By comparing the AP of the energy storage inverter at the first and second moments with the AP of the inverter under different threading methods (± ± ) to identify the correct direction of the power line passing through the magnetic ring. According to the output power change of the regulation system and the power change calculated by the current sensor, the correct direction of the power line passing through the magnetic ring is identified through the power change caused by the current change, thereby saving the user's learning cost and having the advantage of simple operation.

[0004] The above patent requires automatic shutdown when the system power exceeds 100W, and direction identification through characteristic power changes. The operation process is relatively complicated, involving shutdown, multiple data recording and comparison. The system operation takes a long time and the automatic identification speed is slow. Summary of the invention

[0005] In view of the above problems in the prior art, the purpose of the present invention is to provide a method for rapid self-identification of a current detection module, in which the judgment logic of the self-identification process is simpler, the algorithm execution process takes less time, and the identification process does not require shutdown and restart, thereby realizing rapid self-identification of the current detection module.

[0006] A fast self-identification method for a current detection module, wherein the current detection module is connected to a power line L1 and a power line L2, wherein the current detection module includes a wiring ring 1 and a wiring ring 2, and the process of the current detection module self-identifying the connection between the power line and the wiring ring includes the following steps: The first step is to set the output power of the power line L1 to 0, the output power of the power line L2 to 0, and record the detection power P1 of the wiring ring 1 and the detection power P2 of the wiring ring 2 of the current detection module at this time; The second step is to set the output power of the power line L1 to A and the output power of the power line L2 to 0, and record the detection power P1' of the wiring loop 1 and the detection power P2' of the wiring loop 2 of the current detection module at this time; The third step is to determine which wiring ring the power line L1 with output power A is actually connected to: If |P1'-P1| is A, then the power line L1 is connected to the wiring loop 1; If |P2'-P2| is A, then the power line L1 is connected to the wiring ring 2; Step 4: According to the judgment result of step 3, determine the connection direction of the wiring ring connected to the power line L1: If the detected power change of the wiring loop connected to the power line L1 is positive, the connection direction of the wiring loop connected to the power line L1 is reverse; if the detected power change of the wiring loop connected to the power line L1 is negative, the connection direction of the wiring loop connected to the power line L1 is forward; Step 5: According to the judgment result of step 3, determine the connection direction of the wiring loop connected to the power line L2: set the output power of the power line L1 to 0, the output power of the power line L2 to A, and record the detection power P1'' of the wiring loop 1 and the detection power P2'' of the wiring loop 2 of the current detection module at this time; If the detected power change of the wiring ring connected to the power line L2 is positive, the connection direction of the wiring ring connected to the power line L2 is reverse; if the detected power change of the wiring ring connected to the power line L2 is negative, the connection direction of the wiring ring connected to the power line L2 is forward.

[0007] Preferably, according to the determination result of the third step, the specific process of determining the connection direction of the wiring ring connected to the power line L1 is as follows: If the judgment result of the third step is that the power line L1 is connected to the wiring ring 1, then if P1'-P1 is A, the power line L1 is reversely connected to the wiring ring 1; if P1'-P1 is -A, the power line L1 is forwardly connected to the wiring ring 1; If the judgment result of the third step is that the power line L1 is connected to the wiring ring 2, then if P2'-P2 is A, the power line L1 is reversely connected to the wiring ring 2; if P2'-P2 is -A, the power line L1 is forwardly connected to the wiring ring 2.

[0008] Preferably, the specific process of determining the connection direction of the wiring ring connected to the power line L2 according to the determination result of the third step is as follows: setting the output power of the power line L1 to 0, the output power of the power line L2 to A, and recording the detection power P1'' of the wiring ring 1 and the detection power P2'' of the wiring ring 2 of the current detection module at this time; If the judgment result of the third part is that the power line L1 is connected to the wiring ring 1, the power line L2 is connected to the wiring ring 2. At this time, if P2''-P2 is A, the power line L2 is reversely connected to the wiring ring 2. If P2''-P2 is -A, the power line L2 is forwardly connected to the wiring ring 2. If the judgment result of the third part is that the power line L1 is connected to the wiring ring 2, then the power line L2 is connected to the wiring ring 1. At this time, if P1''-P1 is A, the power line L2 is reversely connected to the wiring ring 1, and if P1''-P1 is -A, the power line L2 is forwardly connected to the wiring ring 1.

[0009] Preferably, in the first step of the self-identification process, the output power of power line L1 is set to 0. When the output power of power line L2 is 0, if the detection power P1 of wiring ring one and the detection power P2 of wiring ring two are both 0, the next step of the self-identification process is performed; if the detection power P1 of wiring ring one and the detection power P2 of wiring ring two are not 0, the self-identification process is ended.

[0010] Preferably, in the third step of the self-identification process, if |P1′-P1| is not A and |P2′-P2| is not A, the self-identification process is terminated.

[0011] Preferably, the output power A of the power lines L1 and L2 is set according to the battery modules or PV in the energy storage system where the power lines L1 and L2 are located.

[0012] Preferably, the connection between the current detection module and the power line L1 and the power line L2 includes the following eight situations: The first type: the power line L1 is positively connected to the wiring ring 1, and the power line L2 is positively connected to the wiring ring 2; The second type: the power line L1 is connected to the wiring ring 1 in the reverse direction, and the power line L2 is connected to the wiring ring 2 in the forward direction; The third type is that the power line L1 is connected to the wiring ring 1 in a forward direction, and the power line L2 is connected to the wiring ring 2 in a reverse direction; In the fourth method, the power line L1 is connected to the wiring ring 1 in reverse direction, and the power line L2 is connected to the wiring ring 2 in reverse direction; The fifth type is that the power line L1 is positively connected to the wiring ring 2, and the power line L2 is positively connected to the wiring ring 1; The sixth type is that the power line L1 is reversely connected to the wiring ring 2, and the power line L2 is forwardly connected to the wiring ring 1; The seventh type is that the power line L1 is connected to the wiring ring 2 in a forward direction, and the power line L2 is connected to the wiring ring 1 in a reverse direction; An eighth type is that the power line L1 is reversely connected to the wiring ring 2, and the power line L2 is reversely connected to the wiring ring 1.

[0013] A second object of the present invention is to provide an energy storage system, which identifies the connection status of the grid connection line and the wiring ring of the current detection module through the fast self-identification method of the current detection module.

[0014] Preferably, the energy storage system comprises an inverter, a battery module, a PV and a load, wherein the battery module is connected to the inverter, and the load is connected to the power line.

[0015] The beneficial effects of the present invention are as follows: the rapid self-identification method and energy storage system of the current detection module do not limit the direction and sequence of the power line access to the wiring ring in the current detection module, the operator does not need to learn the wiring method in advance, the operation is simple, the requirements for the operator are low, and it is easy to promote and use.

[0016] The judgment logic of the self-identification process is simpler, the algorithm execution process takes less time, and the identification process does not require shutdown and restart. It can realize rapid self-identification of the current detection module and complete rapid identification of the wiring status within a few seconds after starting the machine and connecting to the grid, which improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is a flow chart of sequentially connecting the power line and the current detection module of the present invention; Figure 2 is a flow chart of the reverse connection of the power line and the current detection module of the present invention; Figure 3 is a structural block diagram of the energy storage system of the present invention; Figure 4 It is a timing diagram of self-identification according to the invention method with the publication number CN113659619B; Figure 5 It is a timing diagram of self-identification according to the method of the present invention. DETAILED DESCRIPTION

[0018] Embodiment 1 like Figure 1 to Figure 2 As shown, a fast self-identification method of a current detection module is used to detect the connection status between the current detection module and the power line.

[0019] For a two-phase energy storage system, the current detection module includes a wiring ring 1 and a wiring ring 2, which are used to detect the connection between the power line L1, the power line L2 and the wiring ring 1 and the wiring ring 2. When in use, the wiring ring 1 and the wiring ring 2 of the current detection module are connected to the power line L1 and the power line L2 respectively. At this time, the connection between the current detection module and the power line L1 and the power line L2 is not clear, and self-identification is required through the current detection module.

[0020] Specifically, the connection conditions between the current detection module and the power line L1 and the power line L2 include the following eight conditions: The first type: the power line L1 is positively connected to the wiring ring 1, and the power line L2 is positively connected to the wiring ring 2; The second type: the power line L1 is connected to the wiring ring 1 in the reverse direction, and the power line L2 is connected to the wiring ring 2 in the forward direction; The third type is that the power line L1 is connected to the wiring ring 1 in a forward direction, and the power line L2 is connected to the wiring ring 2 in a reverse direction; In the fourth method, the power line L1 is connected to the wiring ring 1 in reverse direction, and the power line L2 is connected to the wiring ring 2 in reverse direction; The fifth type is that the power line L1 is positively connected to the wiring ring 2, and the power line L2 is positively connected to the wiring ring 1; The sixth type is that the power line L1 is reversely connected to the wiring ring 2, and the power line L2 is forwardly connected to the wiring ring 1; The seventh type is that the power line L1 is connected to the wiring ring 2 in a forward direction, and the power line L2 is connected to the wiring ring 1 in a reverse direction; An eighth type is that the power line L1 is reversely connected to the wiring ring 2, and the power line L2 is reversely connected to the wiring ring 1.

[0021] Specifically, during the self-identification process of the current detection module, it is assumed that the load remains unchanged and the device can provide the required power. The process of the current detection module self-identifying the connection status of the power line L1 and the power line L2 includes the following steps: The first step is to set the output power of the power line L1 to 0, the output power of the power line L2 to 0, and record the detection power P1 of the wiring ring 1 and the detection power P2 of the wiring ring 2 of the current detection module. At this time, since the output power of the power line L1 and the power line L2 are both 0, if the detection power P1 of the wiring ring 1 and the detection power P2 of the wiring ring 2 are both 0, the current detection module is normal, and the next step of the self-identification process is continued; if the detection power P1 of the wiring ring 1 and the detection power P2 of the wiring ring 2 are not 0, the current detection module is abnormal, the self-identification process is terminated, and the current detection module is repaired.

[0022] In addition, it should be noted that: ideally, when the output power of power line L1 and power line L2 is 0, the detection power of the corresponding connected wiring ring is 0. However, in the actual self-identification process of the current detection module, due to the characteristics of the energy storage system, when the output of power line L1 and power line L2 is 0, the detection power of the corresponding connected wiring ring may not be 0, and the judgment value of the detection power of the wiring ring at this time can be set according to the actual situation. In a specific embodiment, it is considered that when the output power of power line L1 and power line L2 is 0, the detection power of the corresponding wiring ring does not exceed 10W, then the current detection module is considered normal, and the next step of the self-identification process can be continued.

[0023] In the second step, the output power of the power line L1 is set to A, the output power of the power line L2 is set to 0, and the detection power P1' of the first wiring ring and the detection power P2' of the second wiring ring of the current detection module are recorded.

[0024] The third step is to determine which wiring ring the power lines L1 and L2 are actually connected to: determine whether |P1'-P1| is A. If |P1'-P1| is A, it indicates that the power line L1 is connected to the wiring ring 1. Therefore, the power line L2 is connected to the wiring ring 2. At this time, the power lines L1 and L2 are connected to the current detection module in a positive sequence.

[0025] If |P1'-P1| is not A, determine whether |P2'-P2| is A. If |P2'-P2| is A, it indicates that the power line L1 is connected to the wiring ring 2. Therefore, the power line L2 is connected to the wiring ring 1. At this time, the power line L1 and the power line L2 are connected to the current detection module in reverse order.

[0026] If |P1'-P1| is not A and |P2'-P2| is not A, the current detection module is abnormal, the self-identification process is terminated, and the current detection module is repaired.

[0027] Step 4: According to the judgment result of step 3, determine the connection direction of the wiring ring connected to the power line L1: If the third step shows that the power lines L1 and L2 are connected to the current detection module in a positive sequence, P1'-P1 is judged: if P1'-P1 is A, it indicates that the connection direction of the power line L1 and the wiring ring 1 is reverse; if P1'-P1 is -A, it indicates that the connection direction of the power line L1 and the wiring ring 1 is forward.

[0028] If the third step shows that the power line L1, the power line L2 and the current detection module are connected in reverse order, then P2'-P2 is determined: if P2'-P2 is A, it indicates that the connection direction of the power line L1 and the wiring ring 2 is reverse; if P2'-P2 is -A, it indicates that the connection direction of the power line L1 and the wiring ring 2 is forward.

[0029] The fifth step is to determine the connection direction of the wiring ring connected to the power line L2 according to the judgment result of the third step: set the output power of the power line L1 to 0, the output power of the power line L2 to A, and record the detection power P1'' of the wiring ring one and the detection power P2'' of the wiring ring two of the current detection module at this time.

[0030] If the third step concludes that the power lines L1 and L2 are connected to the current detection module in a positive sequence, then P2''-P2 is determined: if P2''-P2 is A, it indicates that the connection direction between the power line L2 and the wiring ring 2 is reverse; if P2''-P2 is -A, it indicates that the connection direction between the power line L2 and the wiring ring 2 is forward.

[0031] If the third step shows that the power lines L1 and L2 are connected to the current detection module in reverse order, P1''-P1 is judged: if P1''-P1 is A, it indicates that the connection direction between the power line L2 and the wiring ring 1 is reverse; if P1''-P1 is -A, it indicates that the connection direction between the power line L2 and the wiring ring 1 is forward.

[0032] The output power A of the power lines L1 and L2 can be set to any power value. In this embodiment, the value of A is 200 W, and the corresponding device can provide a power of more than 200 W.

[0033] In the actual process of implementing the software algorithm, you can first set different output powers of the power line and record the corresponding detection power, and then make processing and judgment based on the recorded data. The specific process is as follows: Record data: First, set the output power of power line L1 to 0, and the output power of power line L2 to 0, and record the detection power P1 of the wiring ring 1 and the detection power P2 of the wiring ring 2 of the current detection module at this time. Then set the output power of power line L1 to A, and the output power of power line L2 to 0, and record the detection power P1' of the wiring ring 1 and the detection power P2' of the wiring ring 2 of the current detection module at this time. Finally, set the output power of power line L1 to 0, and the output power of power line L2 to A, and record the detection power P1'' of the wiring ring 1 and the detection power P2'' of the wiring ring 2 of the current detection module at this time.

[0034] Processing judgment: First, determine which wiring ring the power line L1 is actually connected to based on the detection power P1 of the wiring ring 1, the detection power P2 of the wiring ring 2, the detection power P1', and the detection power P2' of the wiring ring 2. Then, determine the wiring direction of the wiring ring connected to the power line L1 based on the detection power P1 of the wiring ring 1, the detection power P2 of the wiring ring 2, the detection power P1', and the detection power P2' of the wiring ring 2. Finally, determine the wiring direction of the wiring ring connected to the power line L2 based on the detection power P1'' of the wiring ring 1, the detection power P2'' of the wiring ring 2, the detection power P1 of the wiring ring 1, and the detection power P2 of the wiring ring 2.

[0035] The time sequence generated by the self-identification method disclosed in the invention with the publication number CN113659619B Figure 4 and the timing sequence generated by the self-identification method disclosed in this embodiment Figure 5 For comparison, specifically, Figure 4 , Figure 5 The timing diagrams shown respectively represent the process of the self-identification flag bit in the software algorithm corresponding to the self-identification method from being set to 0 to being set to 1, wherein, when the flag bit is 0, self-identification starts, and when the flag bit is 1, self-identification ends. Therefore, the time taken by the self-identification flag bit state change can characterize the time consumption of the self-identification method.

[0036] Figure 4 The length T1 of each cell in represents 6S, and the self-identification process involves 9 cells. Therefore, the self-identification process disclosed in the invention with the publication number CN113659619B takes about 54S. Figure 5 The length T2 of each cell represents 300ms, and the self-identification process involves 11 cells. Therefore, the self-identification process of this embodiment only takes about 3.3S, which greatly improves the self-identification speed.

[0037] Embodiment 2 In this embodiment, the process of the current detection module self-identifying the connection status of the power line L1 and the power line L2 is as follows: The first step is to set the output power of the power line L1 to 0, the output power of the power line L2 to 0, and record the detection power P1 of the wiring ring 1 and the detection power P2 of the wiring ring 2 of the current detection module at this time.

[0038] In the second step, the output power of the power line L1 is set to A, the output power of the power line L2 is set to 0, and the detection power P1' of the first wiring ring and the detection power P2' of the second wiring ring of the current detection module are recorded.

[0039] The third step is to determine that |P1'-P1| is A at this time, then the power line L1 is connected to the wiring ring 1, therefore, the power line L2 is connected to the wiring ring 2, and at this time, the power lines L1 and L2 are connected to the current detection module in a positive sequence.

[0040] The fourth step is to determine that P1'-P1 is A at this time, which indicates that the wiring direction of the wiring ring 1 is reverse.

[0041] Step 5: Set the output power of the power line L1 to 0 and the output power of the power line L2 to A, and record the detection power P1'' of the wiring ring 1 and the detection power P2'' of the wiring ring 2 of the current detection module.

[0042] It is judged that P2''-P2 is A at this time, which indicates that the wiring direction of the wiring ring 2 is reverse.

[0043] At this point, it can be concluded that the power line L1 is reversely connected to the wiring ring 1, and the power line L2 is reversely connected to the wiring ring 2.

[0044] Embodiment 3 In this embodiment, the process of the current detection module self-identifying the connection status of the power line L1 and the power line L2 is as follows: The first step is to set the output power of the power line L1 to 0, the output power of the power line L2 to 0, and record the detection power P1 of the wiring ring 1 and the detection power P2 of the wiring ring 2 of the current detection module at this time.

[0045] In the second step, the output power of the power line L1 is set to A, the output power of the power line L2 is set to 0, and the detection power P1' of the first wiring ring and the detection power P2' of the second wiring ring of the current detection module are recorded.

[0046] The third step is to determine that |P1'-P1| is not A and |P2'-P2| is A, then the power line L1 is connected to the wiring ring 2, therefore, the power line L2 is connected to the wiring ring 1, and the power lines L1 and L2 are connected to the current detection module in reverse order.

[0047] The fourth step is to determine that P2'-P2 is A at this time, which indicates that the wiring direction of the wiring ring 2 is reverse.

[0048] Step 5: Set the output power of the power line L1 to 0 and the output power of the power line L2 to A, and record the detection power P1'' of the wiring ring 1 and the detection power P2'' of the wiring ring 2 of the current detection module.

[0049] At this time, it is judged that P1''-P1 is -A, which indicates that the wiring direction with wiring ring 1 is positive.

[0050] At this point, it can be concluded that the power line L1 is reversely connected to the wiring ring 2, and the power line L2 is forwardly connected to the wiring ring 1.

[0051] Embodiment 4 like Figure 3As shown, the second aspect of the present invention is to provide an energy storage system, which can identify the connection status of the grid connection line and the wiring ring of the current detection module through the fast self-identification method of the current detection module described in Example 1. The energy storage system includes an inverter, a battery module, a PV and a load, the battery module is connected to the inverter, and the load is connected to the power line.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. 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 fast self-identification method for a current detection module, wherein the current detection module is connected to a power line L1 and a power line L2, wherein: The current detection module includes a first wiring ring and a second wiring ring, wherein the process of the current detection module self-identifying the connection status between the power line and the wiring ring includes the following steps: The first step is to set the output power of the power line L1 to 0, the output power of the power line L2 to 0, and record the detection power P1 of the wiring ring 1 and the detection power P2 of the wiring ring 2 of the current detection module at this time; The second step is to set the output power of the power line L1 to A and the output power of the power line L2 to 0, and record the detection power P1' of the wiring loop 1 and the detection power P2' of the wiring loop 2 of the current detection module at this time; The third step is to determine which wiring ring the power line L1 with output power A is actually connected to: If |P1'-P1| is A, then the power line L1 is connected to the wiring loop 1; If |P2'-P2| is A, then the power line L1 is connected to the wiring ring 2; Step 4: According to the judgment result of step 3, determine the connection direction of the wiring ring connected to the power line L1: If the detected power change of the wiring loop connected to the power line L1 is positive, the connection direction of the wiring loop connected to the power line L1 is reverse; if the detected power change of the wiring loop connected to the power line L1 is negative, the connection direction of the wiring loop connected to the power line L1 is forward; Step 5: According to the judgment result of step 3, determine the connection direction of the wiring loop connected to the power line L2: set the output power of the power line L1 to 0, the output power of the power line L2 to A, and record the detection power P1'' of the wiring loop 1 and the detection power P2'' of the wiring loop 2 of the current detection module at this time; If the detected power change of the wiring ring connected to the power line L2 is positive, the connection direction of the wiring ring connected to the power line L2 is reverse; if the detected power change of the wiring ring connected to the power line L2 is negative, the connection direction of the wiring ring connected to the power line L2 is forward.

2. The rapid self-identification method of the current detection module according to claim 1, characterized in that: The specific process of determining the connection direction of the wiring ring connected to the power line L1 according to the determination result of the third step is as follows: If the judgment result of the third step is that the power line L1 is connected to the wiring ring 1, then if P1'-P1 is A, the power line L1 is reversely connected to the wiring ring 1; if P1'-P1 is -A, the power line L1 is forwardly connected to the wiring ring 1; If the judgment result of the third step is that the power line L1 is connected to the wiring ring 2, then if P2'-P2 is A, the power line L1 is reversely connected to the wiring ring 2; if P2'-P2 is -A, the power line L1 is forwardly connected to the wiring ring 2.

3. The rapid self-identification method of the current detection module according to claim 1, characterized in that: The specific process of determining the connection direction of the wiring ring connected to the power line L2 according to the determination result of the third step is as follows: setting the output power of the power line L1 to 0, the output power of the power line L2 to A, and recording the detection power P1'' of the wiring ring 1 and the detection power P2'' of the wiring ring 2 of the current detection module at this time; If the judgment result of the third part is that the power line L1 is connected to the wiring ring 1, the power line L2 is connected to the wiring ring 2. At this time, if P2''-P2 is A, the power line L2 is reversely connected to the wiring ring 2. If P2''-P2 is -A, the power line L2 is forwardly connected to the wiring ring 2. If the judgment result of the third part is that the power line L1 is connected to the wiring ring 2, then the power line L2 is connected to the wiring ring 1. At this time, if P1''-P1 is A, the power line L2 is reversely connected to the wiring ring 1, and if P1''-P1 is -A, the power line L2 is forwardly connected to the wiring ring 1.

4. The rapid self-identification method of the current detection module according to claim 1, characterized in that: In the first step of the self-identification process, the output power of the power line L1 is set to 0. When the output power of the power line L2 is 0, if the detection power P1 of the wiring ring one and the detection power P2 of the wiring ring two are both 0, the next step of the self-identification process is carried out; if the detection power P1 of the wiring ring one and the detection power P2 of the wiring ring two are not 0, the self-identification process is ended.

5. The rapid self-identification method of the current detection module according to claim 1, characterized in that: In the third step of the self-identification process, if |P1'-P1| is not A and |P2'-P2| is not A, the self-identification process ends.

6. The rapid self-identification method of the current detection module according to claim 1, characterized in that: The output power A of the power lines L1 and L2 is set according to the battery modules or PV in the energy storage system where the power lines L1 and L2 are located.

7. The rapid self-identification method of the current detection module according to claim 1, characterized in that: The connection between the current detection module and the power line L1 and the power line L2 includes the following eight situations: The first type: the power line L1 is positively connected to the wiring ring 1, and the power line L2 is positively connected to the wiring ring 2; The second type: the power line L1 is connected to the wiring ring 1 in the reverse direction, and the power line L2 is connected to the wiring ring 2 in the forward direction; The third type is that the power line L1 is connected to the wiring ring 1 in a forward direction, and the power line L2 is connected to the wiring ring 2 in a reverse direction; In the fourth method, the power line L1 is connected to the wiring ring 1 in reverse direction, and the power line L2 is connected to the wiring ring 2 in reverse direction; The fifth type is that the power line L1 is positively connected to the wiring ring 2, and the power line L2 is positively connected to the wiring ring 1; The sixth type is that the power line L1 is reversely connected to the wiring ring 2, and the power line L2 is forwardly connected to the wiring ring 1; The seventh type is that the power line L1 is connected to the wiring ring 2 in a forward direction, and the power line L2 is connected to the wiring ring 1 in a reverse direction; An eighth type is that the power line L1 is reversely connected to the wiring ring 2, and the power line L2 is reversely connected to the wiring ring 1.

8. An energy storage system, characterized in that: The energy storage system identifies the connection status of the grid connection line and the wiring ring of the current detection module through the fast self-identification method of the current detection module according to any one of claims 1 to 7.

9. The energy storage system according to claim 8, characterized in that: The energy storage system includes an inverter, a battery module, a PV and a load, wherein the battery module is connected to the inverter and the load is connected to a power line.

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