A lightning protection system

Abstract

The utility model discloses a lightning protection system, comprising a DC lightning arrester, a relay and a battery cluster; the neutral line of the battery cluster is connected to the neutral line of the mains; the live line of the battery cluster is connected to the relay and is connected in series to the live line of the mains through a group of normally open contacts of the relay; the normally open contact is closed when the coil of the relay is energized; the coil of the relay is connected in series with the normally closed dry contact of the DC lightning arrester; the normally closed dry contact is powered off when the DC lightning arrester detects a lightning strike; a lightning protection circuit constructed by the DC lightning arrester and the relay is arranged between the battery cluster and the DC busbar, and when the DC lightning arrester detects a lightning strike, the connection between the struck battery cluster and the main control box can be disconnected in real time, and the electrical equipment of the device can be protected immediately; at the same time, the EMS can limit the charging and discharging current and perform power-off operations on the entire energy storage system through feedback signals, thereby realizing a comprehensive protection function for the system and achieving more comprehensive protection, thereby improving the safety of the energy storage system.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning protection, in particular to a lightning protection system. Background Art

[0002] In order to solve the safety hazards caused by lightning strikes on battery clusters in string energy storage systems, lightning protection and control are required for each battery cluster. In current technology, the remote signal status of the lightning arrester can only be reported to the energy management system (EMS) through the IO controller. After receiving the signal, the EMS needs a certain reaction time to cut off the power supply of the battery cluster struck by lightning.

[0003] However, this reaction time may lead to lightning accidents, because while waiting for the EMS to respond, the battery cluster is still in operation, which may lead to the risk of electric shock due to short circuit, ground fault, equipment damage and insulation failure. Therefore, the current technology has certain defects in lightning protection.

[0004] In order to improve this situation, a new lightning protection system needs to be developed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a lightning protection system to achieve more comprehensive protection and improve the safety of the energy storage system.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A lightning protection system includes a DC lightning arrester, a relay and a battery cluster;

[0008] The neutral line of the battery cluster is connected to the neutral line of the mains;

[0009] The live wire of the battery cluster is connected to the relay and connected in series to the live wire of the mains electricity through a group of normally open contacts of the relay;

[0010] The normally open contact is closed when the coil of the relay is energized;

[0011] The coil of the relay is connected in series with the normally closed dry contact of the DC lightning arrester;

[0012] The normally closed dry contact is de-energized when the DC lightning arrester detects a lightning strike.

[0013] Furthermore, there are multiple battery clusters, the relays correspond to the number of the battery clusters, and the live wire of each battery cluster is uniquely connected to the live wire of the mains through a group of normally open contacts of a relay.

[0014] Furthermore, the number of the DC lightning arresters corresponds to the number of the relays, and the coil of each relay is uniquely connected to a normally closed dry contact of the DC lightning arrester.

[0015] Furthermore, it also includes an IO controller and an EMS system;

[0016] The signal input port of the IO controller is connected to the normally open contact of the relay and is communicatively connected to the EMS system.

[0017] Further, the normally open contacts of the relay include a first normally open contact and a second normally open contact;

[0018] The live wire of the battery cluster is specifically connected to the live wire of the mains power through the first normally open contact;

[0019] The signal input port of the IO controller is connected to the second normally open contact.

[0020] Furthermore, the IO controller includes signal input ports corresponding to the number of the relays, and each of the signal input ports is respectively connected to a normally open contact of the relay.

[0021] Furthermore, the DC lightning arrester includes a DC+ interface, a DC- interface and a PE interface;

[0022] The DC lightning arrester is connected to the positive pole of the DC bus through the DC+ interface, and is connected to the negative pole of the DC bus through the DC- interface;

[0023] The DC lightning arrester is grounded through the PE interface.

[0024] Further, the DC lightning arrester includes a first normally closed dry contact and a second normally closed dry contact;

[0025] The DC lightning arrester is connected in series to the coil of the relay through the first normally closed dry contact and is connected to the positive power supply electrode;

[0026] The DC lightning arrester is connected to the negative power supply electrode through the second normally closed dry contact.

[0027] Furthermore, the coil operating voltage of the relay is 24V.

[0028] The beneficial effects of the utility model are as follows: a lightning protection system of the utility model is provided with a lightning protection circuit constructed by a DC lightning arrester and a relay between a battery cluster and a DC bus; when the DC lightning arrester detects a lightning strike, it can disconnect the struck battery cluster from the main control box in real time, thereby realizing power-off isolation of the battery cluster and protecting its electrical equipment in the first place; at the same time, the EMS can limit the charging and discharging current and perform power-off operations on the entire energy storage system through feedback signals, thereby realizing a more comprehensive protection function for the system and improving the safety of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural example diagram of a lightning protection system according to an embodiment of the utility model. DETAILED DESCRIPTION

[0030] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0031] Please refer to Figure 1 , a lightning protection system, including a DC lightning arrester, a relay, and a battery cluster;

[0032] The neutral line of the battery cluster is connected to the neutral line of the mains;

[0033] The live wire of the battery cluster is connected to the relay and connected in series to the live wire of the mains electricity through a group of normally open contacts of the relay;

[0034] The normally open contact is closed when the coil of the relay is energized;

[0035] The coil of the relay is connected in series with the normally closed dry contact of the DC lightning arrester;

[0036] The normally closed dry contact is de-energized when the DC lightning arrester detects a lightning strike.

[0037] From the above description, it can be seen that a lightning protection system of the utility model is provided with a lightning protection circuit constructed by a DC lightning arrester and a relay between the battery cluster and the main control box. When the DC lightning arrester detects a lightning strike, it can disconnect the struck battery cluster from the main control box in real time, thereby realizing power-off isolation of the battery cluster and protecting its electrical equipment in the first place. At the same time, the EMS can limit the charging and discharging current and perform power-off operations on the entire energy storage system through feedback signals, thereby realizing a more comprehensive protection function for the system and improving the safety of the energy storage system.

[0038] Furthermore, there are multiple battery clusters, the relays correspond to the number of the battery clusters, and the live wire of each battery cluster is uniquely connected to the live wire of the mains through a group of normally open contacts of a relay.

[0039] As can be seen from the above description, the system is provided with a plurality of battery clusters, and the connection of each battery cluster is controlled respectively by a plurality of relays.

[0040] Furthermore, the number of the DC lightning arresters corresponds to the number of the relays, and the coil of each relay is uniquely connected to a normally closed dry contact of the DC lightning arrester.

[0041] It can be seen from the above description that each battery cluster corresponds to a DC lightning arrester, which is used to detect whether each battery cluster is struck by lightning, so that the battery cluster struck by lightning can be specifically isolated.

[0042] Furthermore, it also includes an IO controller and an EMS system;

[0043] The signal input port of the IO controller is connected to the normally open contact of the relay and is communicatively connected to the EMS system.

[0044] From the above description, it can be seen that the IO controller can report the remote signal to the EMS, and the EMS can limit the charging and discharging current and cut off the power of the entire energy storage system, thereby realizing comprehensive protection functions for the system.

[0045] Further, the normally open contacts of the relay include a first normally open contact and a second normally open contact;

[0046] The live wire of the battery cluster is specifically connected to the live wire of the mains power through the first normally open contact;

[0047] The signal input port of the IO controller is connected to the second normally open contact.

[0048] It can be seen from the above description that the relay is connected to the live wire and the IO controller respectively through two normally open contacts.

[0049] Furthermore, the IO controller includes signal input ports corresponding to the number of the relays, and each of the signal input ports is respectively connected to a normally open contact of the relay.

[0050] It can be seen from the above description that the IO controller is used to obtain the disconnection status of different battery clusters through multiple signal input ports.

[0051] Furthermore, the DC lightning arrester includes a DC+ interface, a DC- interface and a PE interface;

[0052] The DC lightning arrester is connected to the positive pole of the DC bus through the DC+ interface, and is connected to the negative pole of the DC bus through the DC- interface;

[0053] The DC lightning arrester is grounded through the PE interface.

[0054] As can be seen from the above description, the DC lightning arrester includes a DC+ interface, a DC- interface and a PE interface, which are respectively connected to the positive and negative poles and the ground for detecting lightning strikes.

[0055] Further, the DC lightning arrester includes a first normally closed dry contact and a second normally closed dry contact;

[0056] The DC lightning arrester is connected in series to the coil of the relay through the first normally closed dry contact and is connected to the positive power supply electrode;

[0057] The DC lightning arrester is connected to the negative power supply electrode through the second normally closed dry contact.

[0058] From the above description, it can be seen that the DC lightning arrester connects the relay and the positive and negative poles of the power supply through two normally closed dry contacts.

[0059] Furthermore, the coil operating voltage of the relay is 24V.

[0060] From the above description, it can be seen that the operating voltage of the DC lightning arrester and the relay is 24V.

[0061] The utility model discloses a lightning protection system which is suitable for lightning protection of a string type energy storage system.

[0062] Please refer to Figure 1 , Embodiment 1 of the present utility model is:

[0063] A lightning protection system includes a DC lightning arrester, a relay and a battery cluster;

[0064] The neutral line of the battery cluster is connected to the neutral line of the mains;

[0065] The live wire of the battery cluster is connected to the relay and is connected in series to the live wire of the mains through a group of normally open contacts of the relay.

[0066] Please refer to Figure 1 In this embodiment, KA1~KAn represent the coils of the relay, and the relay is also referred to by its coil hereinafter, and 1 and 2 represent two groups of normally open contacts of the relay respectively.

[0067] There are multiple battery clusters, and the relays correspond to the number of the battery clusters. The live wire of each battery cluster is uniquely connected to the live wire of the mains through a group of normally open contacts of a relay.

[0068] In this embodiment, special scenarios are taken into consideration, such as an additional connection between two battery clusters or two battery clusters placed in the same position. In this case, the two battery clusters can share a DC lightning arrester, that is, they are connected to the same DC lightning arrester through relays. For example, there are 4 battery clusters, 4 relays, and 3 DC lightning arresters, of which two battery clusters are connected to the same DC lightning arrester through a relay, and the remaining two battery clusters are connected one-to-one with the remaining two DC lightning arresters through relays.

[0069] Specifically, the normally open contacts of the relay include a first normally open contact and a second normally open contact;

[0070] The live wire of the battery cluster is specifically connected to the live wire of the mains power through the first normally open contact;

[0071] The normally open contact closes when the coil of the relay is energized.

[0072] In this embodiment, it is assumed that there are multiple battery clusters, such as battery cluster 1# to battery cluster n#, which correspond to the first normally open contacts of relays KA1~KAn respectively (the first normally open contacts here are represented by Figure 1 The live wire L of the main control box connects the 1# battery cluster to the n# battery cluster through the first normally open contact 2 of the relay KA1~KAn to the live wire 220V L of the main power supply, and the neutral wire N of the main control box connects the 1# battery cluster to the n# battery cluster through the neutral wire N of the main control box to the neutral wire 220V N of the main power supply.

[0073] The coil of the relay is connected in series with the normally closed dry contact of the DC lightning arrester;

[0074] Specifically, the DC lightning arrester includes a first normally closed dry contact and a second normally closed dry contact;

[0075] The DC lightning arrester is connected in series with the coil of the relay through the first normally closed dry contact and is connected to the positive power supply electrode.

[0076] In this embodiment, each DC lightning arrester is provided with a first normally closed dry contact 12 and a second normally closed dry contact 11. The first normally closed dry contact 12 is connected in series to the coil of the relay and is connected to the positive power supply electrode 24+.

[0077] The DC lightning arrester is connected to the negative power supply electrode through the second normally closed dry contact.

[0078] In this embodiment, each DC lightning arrester is connected to the negative power supply electrode 24 − through the second normally closed dry contact 11 .

[0079] The working voltage of the relay is 24V.

[0080] The normally closed dry contact is de-energized when the DC lightning arrester detects a lightning strike.

[0081] The DC lightning arrester includes a DC+ interface, a DC- interface and a PE interface;

[0082] The DC lightning arrester is connected to the positive pole of the DC bus through the DC+ interface, and is connected to the negative pole of the DC bus through the DC- interface;

[0083] The DC lightning arrester is grounded through the PE interface.

[0084] In this embodiment, the DC lightning arrester further includes a DC+ interface, a DC- interface and a PE interface. The DC lightning arresters SPD1 to SPDn are respectively connected to the positive poles of the DC busbars 1#DC to n#DC through the DC+ interface. Figure 1 The DC lightning arresters SPD1~SPDn are connected to the negative pole of the DC bus 1#DC~n#DC through the DC- interface respectively. Figure 1 In the diagram, 1#DC-~n#DC- are used to represent the DC surge arrester. The DC surge arrester is grounded through the PE interface.

[0085] Based on the above structure, when the battery cluster is struck by lightning, its corresponding DC lightning arrester detects the lightning strike, and its normally closed dry contact is disconnected. The relay coil connected to its normally closed dry contact loses power, and the normally open contact of the relay closes when the coil is energized. At this time, the coil loses power and the normally open contact is disconnected. Since the normally open contact of the relay is disconnected, the battery cluster connected to the mains through the relay, that is, the battery cluster struck by lightning, is disconnected from the mains, isolating the energy storage system.

[0086] Please refer to Figure 1 , Embodiment 2 of the present utility model is:

[0087] A lightning protection system is different from the first embodiment in that the present embodiment specifically describes the number of DC lightning arresters. The number of the DC lightning arresters corresponds to the number of the relays, and the coil of each relay is uniquely connected to a normally closed dry contact of the DC lightning arrester.

[0088] That is, in this embodiment, the number of DC lightning arresters, relays, and battery clusters is 1:1:1.

[0089] Please refer to Figure 1 , Embodiment 3 of the present utility model is:

[0090] A lightning protection system, which differs from the first or second embodiment in that it further includes an IO controller and an EMS system;

[0091] The signal input port of the IO controller is connected to the normally open contact 1 connected to the relay, and is communicatively connected to the EMS system.

[0092] In this embodiment, the IO controller includes signal input ports DI1~DIn corresponding to the number of the relays, and each of the signal input ports is connected to a normally open contact of the relay. Specifically, the signal input port of the IO controller is connected to the second normally open contact of the relay.

[0093] That is, in this embodiment, reference can be made to Figure 1 The signal input ports DI1~DIn of the IO controller are respectively connected to the second normally open contacts 1 of the relays KA1~KAn.

[0094] In this embodiment, the IO controller is connected to the EMS system via LAN.

[0095] The on / off of the high-voltage circuit of the battery cluster is controlled by the auxiliary power supply of 220V (mains power) of the main control box. If the 220V power supply of the main control box is disconnected, the high-voltage circuit of the battery cluster will also be disconnected. Based on this, the 220V L phase of the main control box is connected in series with the lightning protection circuit, and connected to the L phase of the battery cluster through different normally open contacts of the relay. When the battery cluster is struck by lightning, its corresponding relay contact will be disconnected, thereby disconnecting the 220V L phase power supply circuit, and then disconnecting the high-voltage circuit of the battery cluster to ensure system safety. The detailed working principle of the entire circuit is described as follows (taking the 1# battery cluster as an example, the same applies to other battery clusters):

[0096] Under normal conditions, the normally closed dry contacts 11 and 12 of the DC lightning arrester SPD1 are closed, that is, the two ends of the relay coil KA1 are energized, so the normally open contacts 1 and 2 of the relay KA1 are closed. Since 2 is closed, the 1# battery cluster 220V L phase is turned on, and the battery cluster N phase is also connected normally. At this time, the battery cluster main control box works normally; since 1 is closed, the IO controller DI1 detection circuit is turned on, and the IO controller DI1 receives feedback signal 1, indicating that the lightning arrester is in a normal state.

[0097] When the lightning arrester connected to the 1# battery cluster detects a lightning strike, the normally closed dry contacts 11 and 12 of SPD1 are disconnected, and the two ends of the relay coil KA1 are de-energized, so the normally open contacts 1 and 2 of relay KA1 are disconnected. Since the normally open contact 2 is disconnected, the 220V L phase of the 1# battery cluster is not conducting, and the battery cluster is powered off. Since the normally open contact 1 is disconnected, the IO controller DI1 detection circuit is not conducting, and the IO controller DI1 receives the feedback signal 0, indicating that the lightning arrester has been struck by lightning. At this time, the IO control uploads this information to the EMS, and the EMS limits the charging and discharging current and cuts off the power to the entire energy storage system, thereby realizing comprehensive protection functions for the system.

[0098] In summary, the utility model provides a lightning protection system, in which a lightning protection circuit constructed by a DC lightning arrester and a relay is arranged between the battery cluster and the DC busbar. When the DC lightning arrester detects a lightning strike, it can disconnect the struck battery cluster from the main control box in real time, thereby realizing power-off isolation of the battery cluster and protecting its electrical equipment in the first place. At the same time, the EMS can limit the charging and discharging current and perform power-off operations on the entire energy storage system through feedback signals, thereby realizing a more comprehensive protection function for the system and improving the safety of the energy storage system.

[0099] 1. Immediately cut off the power supply to the battery cluster where lightning strike is detected to protect the electrical equipment to which it belongs;

[0100] 2. For a battery cluster struck by lightning, a single cluster reports the lightning fault, and the maintenance direction is clear. After reporting the fault to the EMS, the EMS can limit the charge and discharge current and cut off the power of the entire energy storage system, thereby realizing comprehensive protection of the system.

[0101] 3. The lightning protection hardware circuit of the battery cluster is independent. A single cluster failure cannot be repaired in time and will not affect the normal operation of other battery clusters.

[0102] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A lightning protection system, characterized in that: Includes DC lightning arrester, relay and battery cluster; The neutral line of the battery cluster is connected to the neutral line of the mains; The live wire of the battery cluster is connected to the relay and connected in series to the live wire of the mains electricity through a group of normally open contacts of the relay; The normally open contact is closed when the coil of the relay is energized; The coil of the relay is connected in series with the normally closed dry contact of the DC lightning arrester; The normally closed dry contact is de-energized when the DC lightning arrester detects a lightning strike.

2. A lightning protection system according to claim 1, characterized in that: There are multiple battery clusters, and the relays correspond to the number of the battery clusters. The live wire of each battery cluster is uniquely connected to the live wire of the mains through a group of normally open contacts of a relay.

3. A lightning protection system according to claim 2, characterized in that: The number of the DC lightning arresters corresponds to the number of the relays, and the coil of each relay is uniquely connected to a normally closed dry contact of the DC lightning arrester.

4. A lightning protection system according to any one of claims 1 to 3, characterized in that: It also includes IO controller and EMS system; The signal input port of the IO controller is connected to the normally open contact of the relay and is communicatively connected to the EMS system.

5. A lightning protection system according to claim 4, characterized in that: The normally open contacts of the relay include a first normally open contact and a second normally open contact; The live wire of the battery cluster is specifically connected to the live wire of the mains power through the first normally open contact; The signal input port of the IO controller is connected to the second normally open contact.

6. A lightning protection system according to claim 4, characterized in that: The IO controller includes signal input ports corresponding to the number of the relays, and each of the signal input ports is respectively connected to a normally open contact of the relay.

7. A lightning protection system according to claim 1, characterized in that: The DC lightning arrester includes a DC+ interface, a DC- interface and a PE interface; The DC lightning arrester is connected to the positive pole of the DC bus through the DC+ interface, and is connected to the negative pole of the DC bus through the DC- interface; The DC lightning arrester is grounded through the PE interface.

8. A lightning protection system according to claim 1, characterized in that: The DC lightning arrester comprises a first normally closed dry contact and a second normally closed dry contact; The DC lightning arrester is connected in series to the coil of the relay through the first normally closed dry contact and is connected to the positive power supply electrode; The DC lightning arrester is connected to the negative power supply electrode through the second normally closed dry contact.

9. A lightning protection system according to claim 1, characterized in that: The coil operating voltage of the relay is 24V.

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