Protection method, system and equipment for power conversion and interconnection system

Abstract

The embodiment of the invention relates to the field of electric power systems, and discloses a protection method, system and equipment for an electric power conversion and interconnection system, and the protection method comprises the steps: dividing the electric power conversion and interconnection system into different protection types according to an area where a protection signal is located; different protection strategies are configured for the protection types respectively; the protection strategy is used for controlling a corresponding protection switch to trip; in response to a protection signal for the power conversion and interconnection system, determining a protection type corresponding to the protection signal; and according to the protection type corresponding to the protection signal, determining a protection strategy correspondingly executed by the protection type, and according to the protection strategy, controlling a corresponding protection switch to trip. According to the protection method disclosed by the invention, the problem of over-protection or untimely protection is solved, and at least the technical effects of graded protection, adoption of corresponding protection strategies after faults in different areas inside, and immediate protection and accurate protection can be achieved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of power system technology, and in particular to a protection method, system and device for power conversion and interconnection systems. Background Technology

[0002] The power conversion and interconnection system is connected between the two power supply arms of the traction substation, enabling flexible interconnection and energy transfer between different power supply arms. It features functions such as photovoltaic grid connection (traction grid), intelligent energy storage / release, and renewable energy utilization, achieving peak shaving and valley filling, reducing the peak power of the traction substation, and decreasing electricity costs and demand charges. The system also includes negative sequence management and reactive power compensation functions. The power conversion and interconnection system is shown in the figure.

[0003] Current fault disconnection methods for power conversion and interconnection systems typically only consider medium-voltage side line protection. However, in practical applications, when photovoltaic and energy storage devices are connected to the power conversion and interconnection system, relying solely on medium-voltage side line protection cannot cover fault protection when photovoltaic and energy storage devices fail. This can easily lead to cascading tripping or untimely protection, creating safety hazards. Summary of the Invention

[0004] The purpose of this invention is to provide at least one protection method, system, and device for power conversion and interconnection systems, which can at least solve the problems of overprotection or untimely protection, and at least achieve hierarchical protection, adopting corresponding protection strategies for different internal areas after a fault, thereby achieving the technical effects of timely and accurate protection.

[0005] To address the aforementioned technical problems, at least one embodiment of this application provides a protection method for a power conversion and interconnection system, wherein the power conversion and interconnection system includes a high-voltage side, an energy dispatching device side, and a low-voltage power side connected in sequence; and a protection switch is provided at the incoming line of each of the high-voltage side, the energy dispatching device side, and the low-voltage power side.

[0006] The protection method includes:

[0007] The power conversion and interconnection system is divided into different protection types according to the area where the protection signal is located. The protection types are divided into high-voltage side protection type, energy dispatching device side protection type and low-voltage power side protection type.

[0008] Different protection strategies are configured for each of the aforementioned protection types; the protection strategies are used to control the tripping of the corresponding protection switches.

[0009] In response to protection signals for power conversion and interconnection systems, the protection type corresponding to the protection signal is determined;

[0010] The protection strategy corresponding to the protection type is determined based on the protection type of the protection signal, and the corresponding protection switch is controlled to trip according to the protection strategy.

[0011] At least one embodiment of this application also provides a power conversion and interconnection system, characterized in that it includes:

[0012] A control device, the control device being configured to execute the control method described above; and,

[0013] The high-voltage side, energy dispatching device side, and low-voltage power side are connected to the control device; protective switches are provided at the incoming lines of the high-voltage side, energy dispatching device side, and low-voltage power side.

[0014] At least one embodiment of this application also provides an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the protection method described above.

[0015] At least one embodiment of this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the protection method described above.

[0016] The protection method, system, and device for power conversion and interconnection systems provided in the embodiments of this application divide the power conversion and interconnection system into different protection types according to the area where the protection signal is located. This allows for the allocation of different protection strategies to each protection type. When responding to a protection signal, the appropriate protection strategy can be selected according to the protection type corresponding to the protection signal to control the protection switch to trip. This achieves hierarchical disconnection protection for the corresponding areas that need protection, resulting in timely and accurate protection and avoiding over-protection or untimely protection.

[0017] In some optional embodiments, the protection signal includes a fault signal and a warning signal; the protection type includes a fault protection type corresponding to the fault signal and a warning protection type corresponding to the warning signal; configuring different protection strategies for each of the protection types includes:

[0018] Configure different fault protection strategies for each of the aforementioned fault protection types;

[0019] Configure different early warning protection strategies for each of the aforementioned early warning protection types.

[0020] In some optional embodiments, the control method further includes:

[0021] The high-voltage side protection type, the energy dispatching device side protection type, and the low-voltage power side protection type are arranged in descending order of level;

[0022] The early warning protection strategy configured for the aforementioned early warning protection type includes cutting off the protection switches on the corresponding sides of the current level and all levels below it.

[0023] In some optional embodiments, configuring different fault protection strategies for each of the fault protection types includes:

[0024] When the fault protection type is a high-voltage side protection type and an energy dispatching device side protection type, the configured protection strategy includes disconnecting all protection switches;

[0025] When the fault protection type is the low-voltage power side protection type, the configured protection strategy includes disconnecting the protection switch on the low-voltage power side, or disconnecting the protection switch between the low-voltage power side and the energy dispatching device side.

[0026] In some optional embodiments, the low-voltage power side includes an energy storage device side; the energy storage device side includes an energy storage converter side and an energy storage battery compartment side; both the energy storage converter input side and the energy storage battery compartment input side are equipped with protection switches; when the fault protection type is a low-voltage power side protection type, the configured protection strategy includes disconnecting the protection switch on the low-voltage power side, including:

[0027] When the fault protection type is the energy storage converter side fault protection type, the configured protection strategy includes disconnecting the protection switch between the low voltage power side and the energy dispatching device side.

[0028] When the fault protection type is the energy storage battery compartment side fault protection type, the configured protection strategy includes disconnecting the protection switch on the low voltage side.

[0029] In some optional embodiments, the low-voltage power side includes the photovoltaic device side; the protection strategy for the photovoltaic device side includes:

[0030] When a fault protection type occurs on the photovoltaic device side, the configured protection strategy includes disconnecting the protection switches between the photovoltaic device side and the energy dispatching device side.

[0031] In some optional embodiments, the classification of the power conversion and interconnection system into different protection types according to the area where the protection signal is located includes:

[0032] The power conversion and interconnection system is divided into different regions according to the functional areas connected to each converter.

[0033] The protection signals generated in different areas are determined as the protection type of the area. Attached Figure Description

[0034] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, and these illustrative descriptions do not constitute a limitation on the embodiments.

[0035] Figure 1 This is a schematic diagram of the structure of a power conversion and interconnection system in the prior art;

[0036] Figure 2 This is a flowchart of a protection method for a power conversion and interconnection system provided in one embodiment of this application. Figure 1 ;

[0037] Figure 3 This is a schematic diagram of the configuration of various protection switches in a power conversion and interconnection system provided in one embodiment of this application;

[0038] Figure 4 This is provided as an embodiment of the present application. Figure 2 The process of step S101 Figure 1 ;

[0039] Figure 5 This is provided as an embodiment of the present application. Figure 1 The process of step S102 Figure 1 ;

[0040] Figure 6 This is a protection classification block diagram with energy storage device provided in another embodiment of this application;

[0041] Figure 7 This is a protection classification block diagram provided in another embodiment of this application when a photovoltaic power generation device is installed;

[0042] Figure 8 This is a protection classification block diagram provided in another embodiment of this application, showing the integration of a photovoltaic power generation device and an energy storage device.

[0043] Figure 9 This is a schematic diagram of the structure of an electronic device provided in another embodiment of this application. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this application to help readers better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the various embodiments below is for the convenience of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0045] To facilitate understanding of the embodiments of this application, relevant content regarding power conversion and interconnection systems will be introduced first.

[0046] The power conversion and interconnection system is connected between the two power supply arms of the traction substation, enabling flexible interconnection between the two power supply arms and realizing the transfer of energy between different power supply arms. It has functions such as photovoltaic grid connection (traction grid), intelligent energy storage / release, and renewable energy utilization, realizing peak shaving and valley filling, reducing the peak power of the traction substation, and reducing electricity consumption and demand charges. The system also has functions such as negative sequence management and reactive power compensation.

[0047] The power conversion and interconnection system is composed of, for example Figure 1 As shown, the complete set of power exchange and interconnection equipment mainly consists of matching transformers, energy dispatching devices, photovoltaic devices, energy storage devices, integrated automation protection devices, and AC switchgear.

[0048] The power exchange and interconnection system can use different topologies to connect photovoltaic devices and energy storage devices. In the figure above, the energy dispatching device of the power exchange and interconnection system adopts a multi-level design. The first converter connects to the energy storage device on the intermediate DC side, the second converter connects to the photovoltaic device on the intermediate DC side, the third converter connects to both the photovoltaic device and the energy storage device on the intermediate DC side, and the fourth converter does not have either energy storage or photovoltaic devices. The connection method of photovoltaic devices and energy storage devices varies depending on the power exchange and interconnection system.

[0049] However, existing fault disconnection methods for power conversion and interconnection systems typically only consider medium-voltage side line protection. In actual use, when photovoltaic and energy storage devices are connected to the power conversion and interconnection system, relying solely on medium-voltage side line protection cannot cover fault protection when photovoltaic and energy storage devices fail. This can easily lead to cascading tripping or untimely protection, causing safety hazards.

[0050] To address the aforementioned technical problems of overprotection or untimely protection, this invention proposes a protection method for power conversion and interconnection systems. The implementation details of the protection method for power conversion and interconnection systems in this embodiment are described below. The following implementation details are provided for ease of understanding and are not essential for implementing this solution.

[0051] Example 1:

[0052] The protection method for the power conversion and interconnection system in this embodiment can be applied to electronic devices with communication, computing, and data storage capabilities. Its specific process can be as follows: Figure 2 and Figure 3 As shown, the power conversion and interconnection system includes a high-voltage side, an energy dispatching device side, and a low-voltage power side connected in sequence; protective switches are installed at the incoming lines of the high-voltage side, the energy dispatching device side, and the low-voltage power side. The control method includes:

[0053] Step 101: Divide the power conversion and interconnection system into different protection types according to the area where the protection signal is located. The protection types are divided into high-voltage side protection type, energy dispatching device side protection type and low-voltage power side protection type.

[0054] Specifically, the high-voltage side is the main protection section. By disconnecting the protection switch at the high-voltage side inlet, the main protection section of the system can be cut off for protection. The main protection section includes the matching transformer, energy dispatching device, energy storage device, and other related devices.

[0055] In this embodiment, the protection switch on the high-voltage side consists of two high-voltage circuit breakers, QF1 and QF2. This group of circuit breakers can be tripped in tandem by the main controller of the energy dispatching device and the controller of the relay protection device, and the entire power interconnection system can be disconnected.

[0056] Furthermore, the protection zone on the energy dispatching device side includes the converter cabinets and their associated energy storage / photovoltaic converters within the energy dispatching device. The protection switch on the energy dispatching device side consists of two high-voltage circuit breakers, QF3 and QF4. This set of circuit breakers can be tripped in tandem by the converter cabinet controller, which can disconnect a specific converter cabinet and its associated energy storage / photovoltaic converter.

[0057] Furthermore, the low-voltage power side includes the energy storage device side and / or the photovoltaic device side.

[0058] When the low-voltage power side includes the energy storage device side, this energy storage device side includes protection for the energy storage converter incoming line and protection for the energy storage battery compartment incoming line. The protection switch for the energy storage converter incoming line is circuit breaker QF5, and its protected section is the corresponding energy storage branch of the energy storage converter. This set of circuit breakers can be tripped by the energy storage converter controller, which can disconnect the energy storage device in the corresponding branch. The protection switch for the energy storage battery compartment incoming line is circuit breaker QF6, and its main protected section is the energy storage battery compartment in the corresponding branch. This set of circuit breakers can be tripped by the BMS, which can disconnect the energy storage battery compartment in the corresponding branch.

[0059] When the low-voltage power side includes the photovoltaic device side, the protection switch configured at the incoming line of the photovoltaic converter is circuit breaker QF7, and the main protection section is the photovoltaic power generation branch of the corresponding branch. This set of circuit breakers can be tripped by the photovoltaic converter controller, and can disconnect the photovoltaic power generation device of the corresponding branch.

[0060] Furthermore, the protection signals include fault signals and warning signals; the protection types include fault protection types corresponding to fault signals and warning protection types corresponding to warning signals. It can be understood that the warning signals include warning signals predicting an impending fault and warning signals indicating a minor fault, wherein the warning signals indicating a minor fault are determined by comparing them with the fault severity corresponding to the fault signal.

[0061] By dividing protection signals into fault signals and warning signals, different protection strategies can be provided for different protection types. A protection strategy with a wide protection range can be adopted for fault signals, while a protection strategy with a small protection range that cuts off the fault location can be adopted for warning signals. This distinguishes the degree of fault and makes accurate isolation, improving the effectiveness of timely and accurate protection.

[0062] In some examples, such as Figure 4 As shown, step 101 specifically includes:

[0063] Step 1011: Divide the power conversion and interconnection system into different regions according to the functional areas connected to each converter;

[0064] Step 1012: Determine the protection type of the protection signal generated in different areas as the protection type of the area.

[0065] In some examples, after the region division in step 101, the control method further includes:

[0066] The high-voltage side protection types, energy dispatching device side protection types, and low-voltage power side protection types are arranged in descending order of level.

[0067] By partitioning the power conversion and interconnection system and arranging it hierarchically from high to low according to the partition connection relationship, it is convenient to analyze the number of protection levels required when a fault occurs based on the hierarchical relationship. This facilitates the development of targeted protection strategies, enabling the provision of protection by region and level, which is more adaptable to the corresponding protection needs and provides timely and accurate power outage protection for the corresponding region.

[0068] Step 102: Configure different protection strategies for each of the protection types; the protection strategies are used to control the tripping of the corresponding protection switches.

[0069] In some embodiments, the early warning protection strategy configured for the early warning protection type includes cutting off the protection switches on the corresponding sides of the current level and all levels below it.

[0070] In some embodiments, such as Figure 5 As shown, step 102 includes:

[0071] Step 1021: Configure different fault protection strategies for each of the aforementioned fault protection types;

[0072] Specifically,

[0073] When the fault protection type is a high-voltage side protection type and an energy dispatching device side protection type, the configured protection strategy includes disconnecting all protection switches;

[0074] When the fault protection type is the low-voltage power side protection type, the configured protection strategy includes disconnecting the protection switch on the low-voltage power side, or disconnecting the protection switch between the low-voltage power side and the energy dispatching device side.

[0075] In this embodiment, the low-voltage power side includes the energy storage device side and the photovoltaic device side. Specifically, the protection strategy configured when the fault protection type is the low-voltage power side protection type includes:

[0076] When the fault protection type is the energy storage converter side fault protection type, the configured protection strategy includes disconnecting the protection switch between the low voltage power side and the energy dispatching device side.

[0077] When the fault protection type is the energy storage battery compartment side fault protection type, the configured protection strategy includes disconnecting the protection switch on the low voltage side.

[0078] When a fault protection type occurs on the photovoltaic device side, the configured protection strategy includes disconnecting the protection switches between the photovoltaic device side and the energy dispatching device side.

[0079] Specifically, referring to the circuit breaker switch, when the energy storage converter fails, the incoming line protection circuit breaker QF5 of the energy storage converter trips. At the same time, the energy storage converter sends a fault signal to the energy storage battery compartment control system. The energy storage battery compartment control system will trip the incoming line protection circuit breaker QF6 of the energy storage battery compartment, disconnecting the entire branch of the energy storage device. The energy storage converter then sends the fault signal to the energy dispatching device converter cabinet. The converter cabinet will trip circuit breakers QF3 and QF4, achieving the complete disconnection of the single converter cabinet and the entire branch of the energy storage device.

[0080] When the energy storage battery compartment fails, the energy storage battery compartment control system will trip the incoming line protection circuit breaker QF6 of the energy storage battery compartment. At the same time, the energy storage battery compartment control system will upload the fault signal to the energy storage converter. When the energy storage converter receives the energy storage battery compartment fault signal, it will trip the incoming line protection circuit breaker QF5 of the energy storage converter. At this time, the entire branch of the energy storage device will be disconnected.

[0081] When the photovoltaic converter fails, the incoming circuit breaker QF7 of the photovoltaic device trips. At the same time, the photovoltaic converter uploads the fault signal to the energy dispatching device converter. The converter cabinet will trip circuit breakers QF3 and QF4 in tandem, realizing the overall disconnection of the single converter cabinet and the photovoltaic branch.

[0082] Step 1022: Configure different early warning protection strategies for each of the aforementioned early warning protection types.

[0083] By distinguishing between faults and early warnings, appropriate early warning protection can be configured separately. Compared with the scheme of applying uniform protection to all fault levels, this case provides more precise and efficient fault protection, which is conducive to maintaining the stability of the entire power system and improving the accuracy and rationality of protection.

[0084] Specifically, the early warning protection strategy configured for the early warning protection type includes cutting off the protection switches on the corresponding sides of the current level and all levels below it, making the protection strategy for the early warning protection type more lenient. It only cuts off the protection switches on the corresponding sides of the area where the early warning occurs and the levels below it, making it easier to isolate the area for fault repair and maintenance.

[0085] Step 103: In response to the protection signal of the power conversion and interconnection system, determine the protection type corresponding to the protection signal;

[0086] Specifically, each converter in the power conversion and interconnection system can detect fault information in its own branch and determine protection signals based on this fault information. The protection signals include fault signals and warning signals.

[0087] In this embodiment, due to the adoption of hierarchical fault disconnection processing, when the upper level responds to the fault signal, it will send the fault signal to the lower level converters, thereby disconnecting and protecting the branches of the complete system at that level and below.

[0088] Step 104: Determine the protection strategy to be executed corresponding to the protection type based on the protection type corresponding to the protection signal, and control the corresponding protection switch to trip according to the protection strategy.

[0089] In this embodiment, different protection strategies already include the protection switches that need to be turned off according to their respective protection strategies. By determining the protection strategy and executing it, the corresponding disconnection protection can be performed.

[0090] In this embodiment, the power conversion and interconnection system is divided into different protection types according to the area where the protection signal is located. This allows for the allocation of different protection strategies to each protection type. When responding to a protection signal, the appropriate protection strategy can be selected based on the protection type to control the protection switch to trip. This achieves hierarchical protection of the corresponding areas requiring protection, resulting in timely and accurate protection and preventing over-protection or delayed protection. Furthermore, corresponding protection strategies are developed for the energy storage device and photovoltaic device sides, enabling targeted protection based on fault information, further achieving timely and accurate protection and avoiding over-protection or delayed protection.

[0091] Example 2:

[0092] The protection method of this embodiment can be applied to electronic devices with communication, computing, and data storage capabilities. Specifically, this protection method is applied to power conversion and interconnection systems with energy storage devices. The protection classification for power conversion and interconnection systems with energy storage devices is as follows: Figure 6 As shown in the table below, the protection classification is as follows:

[0093] Table 1 Protection Classification

[0094]

[0095]

[0096] When different components of the system malfunction, the corresponding protection actions are shown in the table below:

[0097] Table 2

[0098]

[0099]

[0100] In another embodiment, the protection method of this embodiment is applied to a power conversion and interconnection system with photovoltaic power generation devices. Specifically, the protection hierarchy for the power conversion and interconnection system with photovoltaic power generation devices is as follows: Figure 7 As shown in the table below, the protection classification is as follows:

[0101] Table 3 Protection Classification

[0102]

[0103]

[0104] The corresponding protection actions when different components of the system fail are shown in the table below:

[0105] Table 4

[0106]

[0107] In another embodiment, the protection method of this embodiment is applied to a power conversion and interconnection system with photovoltaic power generation devices and energy storage devices. Specifically, the protection classification for the power conversion and interconnection system with photovoltaic power generation devices and energy storage devices is as follows: Figure 8 As shown in the table below, the protection classification is as follows:

[0108] Table 5 Protection Classification

[0109]

[0110]

[0111] When different components of the system malfunction, the corresponding protection actions are shown in the table below:

[0112]

[0113] Through the above embodiments, this method adopts a hierarchical protection strategy, which can quickly isolate photovoltaic or energy storage devices when they fail, reducing the impact on power exchange and interconnection systems. At the same time, it ensures efficient and flexible access of renewable energy and energy storage. Through the multi-level protection strategy of the system, it can achieve rapid identification and isolation of faults, improving the flexibility of power conversion and interconnection system operation and the safety of equipment.

[0114] Example 3:

[0115] Another embodiment of this application relates to a flexible power distribution system. The implementation details of this flexible power distribution system are described below. The following details are for ease of understanding and are not essential for implementing this solution. Figure 2 As shown, the flexible power distribution system of this embodiment includes a control device for executing the control method described in Embodiment 1; and a high-voltage side, an energy dispatching device side, and a low-voltage power side connected to the control device; and a protection switch is provided at the incoming line of the high-voltage side, the energy dispatching device side, and the low-voltage power side.

[0116] It is worth mentioning that all modules involved in this embodiment are logical modules. In practical applications, a logical unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. Furthermore, to highlight the innovative aspects of this application, this embodiment does not introduce units that are not closely related to solving the technical problems proposed in this application; however, this does not mean that other units are absent in this embodiment.

[0117] Example 4:

[0118] Another embodiment of this application relates to an electronic device, such as... Figure 9 As shown, it includes: at least one processor 901; and a memory 902 communicatively connected to the at least one processor 901; wherein the memory 902 stores instructions executable by the at least one processor 901, the instructions being executed by the at least one processor 901 to enable the at least one processor 901 to perform the protection method of the power conversion and interconnection system in the above embodiments.

[0119] The memory and processor are connected via a bus, which can include any number of interconnecting buses and bridges, connecting various circuits of one or more processors and memories. The bus can also connect various other circuits, such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and will not be described further herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be a single element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices over a transmission medium. Data processed by the processor is transmitted over the wireless medium via an antenna, which further receives data and transmits it to the processor.

[0120] The processor manages the bus and general processing, and also provides various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. Memory is used to store data used by the processor during operation.

[0121] Example 5:

[0122] Another embodiment of this application relates to a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements the method embodiments described above.

[0123] That is, those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0124] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing this application, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this application.

Claims

1. A protection method for a power conversion and interconnection system, characterized in that, The power conversion and interconnection system includes a high-voltage side, an energy dispatching device side, and a low-voltage power side connected in sequence; each of the high-voltage side, energy dispatching device side, and low-voltage power side is equipped with a protection switch at its inlet; the protection method includes: The power conversion and interconnection system is divided into different protection types according to the area where the protection signal is located. The protection types are divided into high-voltage side protection type, energy dispatching device side protection type and low-voltage power side protection type. Different protection strategies are configured for each of the aforementioned protection types; the protection strategies are used to control the tripping of the corresponding protection switches. In response to protection signals for power conversion and interconnection systems, the protection type corresponding to the protection signal is determined; The protection strategy corresponding to the protection type is determined based on the protection type of the protection signal, and the corresponding protection switch is controlled to trip according to the protection strategy.

2. The protection method for a power conversion and interconnection system according to claim 1, characterized in that, The protection signals include fault signals and warning signals; the protection types include fault protection types corresponding to fault signals and warning protection types corresponding to warning signals. The configuration of different protection strategies for each of the protection types includes: Configure different fault protection strategies for each of the aforementioned fault protection types; Configure different early warning protection strategies for each of the aforementioned early warning protection types.

3. The protection method for a power conversion and interconnection system according to claim 2, characterized in that, The control method further includes: arranging the high-voltage side protection type, the energy dispatching device side protection type, and the low-voltage power side protection type in descending order of hierarchy; The early warning protection strategy configured for the aforementioned early warning protection type includes cutting off the protection switches on the corresponding sides of the current level and all levels below it.

4. A protection method for a power conversion and interconnection system according to claim 2 or 3, characterized in that, The configuration of different fault protection strategies for each of the fault protection types includes: When the fault protection type is a high-voltage side protection type and an energy dispatching device side protection type, the configured protection strategy includes disconnecting all protection switches; When the fault protection type is the low-voltage power side protection type, the configured protection strategy includes disconnecting the protection switch on the low-voltage power side, or disconnecting the protection switch between the low-voltage power side and the energy dispatching device side.

5. A protection method for a power conversion and interconnection system according to claim 2 or 3, characterized in that, The low-voltage power side includes an energy storage device side; the energy storage device side includes an energy storage converter side and an energy storage battery compartment side; both the energy storage converter inlet side and the energy storage battery compartment inlet side are equipped with protection switches. When the fault protection type is a low-voltage power side protection type, the configured protection strategy includes disconnecting the protection switch on the low-voltage power side, including: When the fault protection type is the energy storage converter side fault protection type, the configured protection strategy includes disconnecting the protection switch between the low voltage power side and the energy dispatching device side. When the fault protection type is the energy storage battery compartment side fault protection type, the configured protection strategy includes disconnecting the protection switch on the low voltage side.

6. The protection method for a power conversion and interconnection system according to claim 2, characterized in that, The low-voltage power side includes the photovoltaic device side; the protection strategy for the photovoltaic device side includes: When a fault protection type occurs on the photovoltaic device side, the configured protection strategy includes disconnecting the protection switches between the photovoltaic device side and the energy dispatching device side.

7. The protection method for a power conversion and interconnection system according to claim 1, wherein classifying the power conversion and interconnection system into different protection types according to the area where the protection signal is located includes: The power conversion and interconnection system is divided into different regions according to the functional areas connected to each converter. The protection signals generated in different areas are determined as the protection type of the area.

8. A power conversion and interconnection system, characterized in that, include: A control device, the control device being used to perform the control method according to any one of claims 1-7; as well as, The high-voltage side, energy dispatching device side, and low-voltage power side are connected to the control device; protective switches are provided at the incoming lines of the high-voltage side, energy dispatching device side, and low-voltage power side.

9. An electronic device, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the control method according to any one of claims 1 to 7.

Images