Power distribution network autonomous control terminal with physical security audit function and method

Abstract

The embodiment of the invention discloses a power distribution network autonomous control terminal with a physical security auditing function and a method, and relates to the technical field of intelligent power grids, the terminal comprises a data acquisition module used for acquiring power grid operation state data of a power distribution network and working data of local equipment connected with the power distribution network; the execution module is used for controlling the operation state of the external electrical equipment according to the control instruction; the core control module generates a control instruction locally based on the collected data according to an edge computing strategy; the state detection unit is used for detecting whether the device packaging shell is opened or not and generating a state detection signal; when the core control module receives the state detection signal, a preset safety alarm event is generated and sent to a far-end master station system through the communication module; the terminal integrates a cloud edge collaborative algorithm, has the capability of access calculation of various data, realizes local and intelligent autonomous management of a distributed power supply cluster, and improves the physical security protection capability of an edge control terminal.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of smart grid, and particularly relates to a power distribution network autonomous control terminal with physical security auditing function and a method. BACKGROUND

[0002] In recent years, with the increasing penetration of photovoltaic, wind power and other distributed power sources in the power distribution network, in order to ensure the stable operation of the power grid, it is necessary to efficiently and timely regulate and control these scattered power sources.

[0003] The traditional centralized dispatching control mode is difficult to adapt to the volatility, randomness and dispersion characteristics. The existing terminal equipment has single function, poor expansibility, low computing rate and limited communication protocol compatibility. In the case of high proportion of distributed power access, it is impossible to realize flexible access, on-site collaborative control and cluster autonomous management of distributed power. Moreover, the edge control terminal in the prior art is usually deployed in unattended environments such as outdoors and stations, and its physical security protection capability is generally insufficient. Once the terminal is maliciously destroyed, not only will its autonomous control function fail, but also it may cause incorrect control instructions due to data errors or logic tampering, which poses a serious threat to the safe and stable operation of the entire power distribution network. Therefore, it is a technical problem to be solved to solve the problem of insufficient computing rate and single function of traditional centralized regulation and control equipment, and to improve the physical security auditing and active protection capability of the terminal itself. SUMMARY

[0004] The main purpose of the present application is to provide a power distribution network autonomous control terminal with physical security auditing function, to solve the technical problems of insufficient computing rate, single function of traditional centralized regulation and control equipment, and insufficient physical security protection capability of the terminal, and to improve the operation reliability of the terminal itself and the power grid system.

[0005] To achieve the above-mentioned purpose, the first aspect of the present application provides a power distribution network autonomous control terminal with physical security auditing function, the terminal comprising a device packaging shell, a data acquisition module, a communication module, an execution module and a core control module, wherein: The data acquisition module is configured to acquire power grid operation state data of the power distribution network and working data of at least one local device connected to the power distribution network. The execution module is configured to control the operation state of the external electrical equipment according to the control instruction. The core control module is connected with the data acquisition module, the communication module and the execution module, and is configured to generate the control instruction locally based on the acquired power grid operation state data and local device working data, and according to a preset edge computing strategy. The terminal also comprises a state detection unit arranged on the device package shell, configured to detect whether at least a part of the device package shell is opened, and generate a state detection signal; The core control module is further configured to generate a preset security alarm event when the state detection signal is received, and send the security alarm event to a remote master station system through the communication module.

[0006] The second aspect of the application provides a physical security audit method applied to the power distribution network autonomous control terminal of the first aspect, and the method comprises the following steps: A state detection unit arranged on the device package shell of the terminal is configured to detect whether at least a part of the device package shell is opened, and generate a state detection signal when it is detected that the device package shell is opened; The core control module of the terminal receives the state detection signal and generates a preset security alarm event; The security alarm event is sent to a remote master station system through the communication module of the terminal.

[0007] The technical solution provided by the application has the following beneficial effects: 1. The integrated cloud edge collaborative algorithm has the ability to access and calculate various data, realizes the in-situ and intelligent autonomous management of the distributed power supply cluster. 2. The physical security protection capability is enhanced. Through the added state detection unit and the security response logic in the core control module, the physical state of the terminal shell can be monitored in real time. Once unauthorized opening occurs, the system can immediately perceive and report an alarm, realizing the transition from passive physical protection to active security audit, effectively curbing the attempt of physical damage or tampering of the terminal. 3. The reliability of system operation is improved. By reporting the physical security alarm event to the remote master station, the operation and maintenance personnel can learn about the potential risks in time and intervene; in the preferred scheme, once illegal opening is detected, the control output can be automatically locked, avoiding the issuance of incorrect instructions in the tampered state of the terminal, thereby ensuring the safe and stable operation of the entire power distribution network. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0009] Among them: Figure 1 A structure schematic diagram of a power distribution network autonomous control terminal with physical security audit function provided by the embodiment of the application; Figure 2 A power distribution network autonomous control terminal appearance structure schematic diagram provided by an embodiment of the present application; Figure 3 Another power distribution network autonomous control terminal structure schematic diagram provided by an embodiment of the present application with physical security audit function; Figure 4A A strong electric connector partial schematic diagram provided by an embodiment of the present application; Figure 4B A weak electric connector partial schematic diagram provided by an embodiment of the present application; Figure 5 A physical security audit method flow schematic diagram provided by an embodiment of the present application. DETAILED DESCRIPTION

[0010] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor are within the scope of protection of the present application.

[0011] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish different objects, not to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0012] In this document, the term "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it independent or alternative to other embodiments. The person skilled in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0013] The embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0014] The terminal referred to in the embodiments of the present application refers to a power distribution network autonomous control terminal.

[0015] Figure 1This is a schematic diagram of the structure of a power distribution network autonomous control terminal with physical security audit function provided in an embodiment of this application.

[0016] like Figure 1 As shown, the autonomous control terminal 1 of the power distribution network includes a device enclosure 100, a data acquisition module 200, a communication module 300, an execution module 400, and a core control module 500, wherein: The aforementioned data acquisition module 200 is used to acquire power grid operation status data of the distribution network and working data of at least one local device connected to the aforementioned distribution network. The aforementioned execution module 400 is used to control the operating status of external electrical equipment according to control commands; The core control module 500 is connected to the data acquisition module 200, the communication module 300 and the execution module 400. The core control module 500 is configured to generate the control commands locally based on the acquired power grid operation status data and local device working data, and according to a preset edge computing strategy. The terminal 1 also includes a status detection unit 600, which is disposed on the device packaging shell 100 and is used to detect whether at least a part of the device packaging shell 100 is opened and generate a status detection signal. The aforementioned core control module 500 is also configured to generate a preset security alarm event when the aforementioned status detection signal is received, and send it to the remote master station system through the aforementioned communication module 300.

[0017] Figure 2 This is a schematic diagram of the appearance structure of a power distribution network autonomous control terminal provided in an embodiment of this application.

[0018] like Figure 2 As shown, the terminal includes a device enclosure 100, which consists of an upper cover 101, a flip cover 102, a human-machine interaction indicator light 103, and an end cover 104. The presence of the upper cover 101, flip cover 102, and end cover 104 is to protect the internal structure and form the overall appearance. The human-machine interaction indicator light 103 uses different lighting methods to indicate to the staff the status of the device's operation.

[0019] Reference Figure 1 and Figure 2The power distribution network autonomous control terminal of the embodiment includes a solid device packaging shell 100 in physical structure. The device packaging shell 100 can be made of metal or high-strength engineering plastic to accommodate and protect the internal precision electronic components from the outdoor harsh environment (such as rain, dust, high and low temperature, etc.). Specifically, the device packaging shell 100 can include a main body part, an upper cover 101 that can be opened upward, a flip cover 102 covering the front panel interface area, and a detachable end cover 104 covering the rear end of the strong electric connection area. The split design can ensure the overall sealing and facilitate the installation, wiring and debugging of the maintenance personnel.

[0020] In the interior of the device packaging shell 100, a plurality of functional modules are arranged. The core control module 500 serves as the control center of the entire terminal and is responsible for data processing, strategy decision and task scheduling. In an embodiment of the application, the core control module 500 can be implemented by a high-performance system-on-chip based on ARM architecture, which integrates a central processor, memory, flash memory and various peripheral interface controllers. The central processor runs an embedded operating system (such as embedded Linux), which provides a stable and reliable environment for the running of upper-layer application programs. The core control module 500 is electrically connected and data-interacts with all other functional modules of the terminal through an internal bus to coordinate them to complete the tasks of autonomous control and safety audit.

[0021] The data acquisition function of the terminal is undertaken by the data acquisition module 200. In the embodiment, the data acquisition module 200 can specifically be embodied as a series of physical interfaces and their corresponding data processing circuits.

[0022] In an alternative embodiment, the data acquisition module 200 includes a strong electric connector and a weak electric connector.

[0023] The strong electric connector is a group of large-current and high-voltage terminal, which is directly connected with the power distribution network line for acquiring the operating state data of the power grid. Specifically, the analog quantities such as the three-phase voltage signals (Ua, Ub, Uc) converted by the voltage transformer and the current transformer, the three-phase current signals (Ia, Ib, Ic) and the zero sequence current signal (I0) are input to the signal conditioning circuit (such as filtering, amplification, isolation) inside the terminal through the strong electric connector, and then sent to the analog-to-digital converter on the core control module chip for sampling and converted into digital signals.

[0024] The weak current connector is a set of terminal rows for connecting the control or communication lines of the local device. It can be used to collect the working data of the local device, for example, receiving the auxiliary contact signal of the external circuit breaker through the digital input (DI) terminal thereon to learn the on-off state of the circuit breaker; or communicating with the distributed power supply 30 such as the photovoltaic inverter and energy storage converter through the integrated RS485 or RS232 serial communication interface, complying with the Modbus or IEC61850 standard protocol, and reading the detailed working data such as the current output power, voltage and frequency of the distributed power supply.

[0025] The communication module 300 is responsible for implementing the communication function of the terminal. As an optional implementation manner, the communication module 300 can include an uplink communication unit and a downlink communication unit.

[0026] The uplink communication unit can be implemented by a remote communication module, which is an Ethernet communication supporting unit connected to the FE network port on the terminal panel. Through the network port, the terminal can access the communication network such as optical fiber and 4G / 5G wireless network, and establish a data channel with the remote host station located in the cloud or the dispatch center, for reporting the local state, alarm events and receiving the configuration or control instructions issued by the remote end. The downlink communication unit can be implemented by a local communication module, which integrates the RS485 serial communication capability, and the physical interface is part of the aforementioned weak current connector. Through the unit, the core control module can interact with the local devices such as distributed power supply in the field.

[0027] The execution module 400 is used to implement the instruction execution function of the terminal. In the embodiment, the execution module 400 can be one or more switching switches, such as high-power relays or solid-state switches. The control end of the switching switch is connected to the general input and output pin (GPIO) of the core control module, and the output contact is connected to the external electrical equipment (such as the trip coil of the circuit breaker or the control coil of a contactor). When the core control module needs to perform control operation, it changes the level state (high level or low level) of the corresponding GPIO pin to drive the switching switch to attract or break, thereby realizing the switching control of the external electrical equipment.

[0028] Figure 3 Another structure schematic diagram of the power distribution network autonomous control terminal provided by the embodiment of the application is provided, which shows the modules inside the terminal. The device packaging shell 100 and its related structures (101-104) can be referred to the description in the embodiment shown in Figure 2 The description will not be repeated here.

[0029] The power distribution network autonomous control terminal further includes: Various interfaces 200, including debugging serial port 201, FE network port 202, strong current connector 203, detection guide hole 204, weak current connector 205, RTC battery port 206, flip opening detection port 207, end cover opening detection port 208, etc. As shown in Figure 3 , Debugging serial port 201: as a local maintenance and configuration interface, it realizes functions such as local login, initialization configuration, firmware burning, fault diagnosis, etc.

[0030] FE network port 202: as the main channel of remote communication and data uplink, it realizes functions such as communication with the master station, local LAN access, remote maintenance, etc.

[0031] Strong current connector 203: the core input interface for sensing the operating state of the power grid, the local schematic diagram is shown in Figure 4A , , which is responsible for accessing:

[0032] ① Three-phase voltage signal (Ua, Ub, Uc, Un): directly taken from the PT (voltage transformer) or directly connected (in low-voltage systems).

[0033] ② Three-phase current signal (Ia, Ib, Ic): access to secondary side current signal from CT (current transformer).

[0034] ③ Zero sequence current signal (I0): used for monitoring ground fault and unbalance degree.

[0035] Detection guide hole 204: as a debugging interface for writing equipment. Figure 4B Weak current connector 205: as an external intelligent device and sensor integration hub, it can realize remote signaling input, receive status signals from circuit breakers, switches, etc.; At the same time, it can realize RS485 communication interface to connect smart meters, photovoltaic inverters and other sensors for data acquisition and control and RS232 maintenance interface for connecting specific serial port devices; As temperature and humidity collection and remote control output, it sends on-off instructions to control external circuit breakers and load switches, and realizes switching of operating modes. The local schematic diagram of the weak current connector is shown in

[0036] .

[0037] Flip cover opening detection port 207, end cover opening detection port 208: with laser or for detecting whether the flip cover is opened, because when the flip cover is opened, the terminal will immediately record an event log of "front panel opening" and send to the main station, for security audit, to prevent unauthorized operation; the back end is a strong electrical wiring part, and unauthorized opening is extremely dangerous. The terminal will immediately generate the highest level of alarm event and send it, prompting that illegal electrical operation may be performed, ensuring the safety of equipment and personnel.

[0038] Multi-protocol communication module 300, corresponding to the aforementioned communication module 300, is respectively composed of remote communication module 301 and local communication module 302, wherein: Remote communication module 301: communicates with the remote through the 202FE network port, and the core is "uploading and receiving". Through 4G / 5G, optical fiber and other networks, the power grid data collected locally is encapsulated into a standard protocol and reliably uploaded, and the control instructions, parameter settings and other commands from the main station are received and analyzed.

[0039] Local communication module 302: realizes data interaction between the terminal and the field intelligent equipment (such as electric meter, inverter, switch) through the 202FE network port, and is the core of data acquisition and control. It collects various data by polling through RS485, power line carrier and other ways, and accurately issues control commands to specific execution units according to the protocol (such as DL / T645, Modbus).

[0040] Switching switch 400: realizes "remote or automatic circuit on-off control", and is the remote control output node, which automatically changes the running state of external circuits or devices.

[0041] Among them, the terminal's circuit board is provided with an RTC battery port 206 for installing a button cell. The battery provides independent and persistent power supply for the real-time clock chip on the board, ensuring that even in the case of terminal main power failure, the real-time clock can continue to accurately time. The technical features of the embodiment are mainly reflected in the software logic running in the core control module. In the program of the core control module, a set of safety interlocking logic is added, which closely associates the input signals of the state detection unit with the output enable control of the execution module. The detailed working process is as follows: When the operation and maintenance personnel or illegal personnel open the flip cover 102, the flip cover opening detection port 207 generates a state detection signal. After the core control module receives the signal, it will concurrently execute a series of strengthened safety response operations: First, the active defense strategy is executed, that is, the execution module is locked. The core control module immediately sends a hardware-level or software highest priority "inhibit" instruction to the drive circuit of the execution module (switching switch 400). The instruction will lock the drive circuit, for example, by a logical AND gate, taking the state detection signal as the enable input, allowing the control signal to pass through only when the signal is normal. Once the shell is opened, the enable signal is disabled, and even if the autonomous control logic happens to generate a control instruction to remove the load at this time due to power grid fluctuations, the instruction cannot be transmitted to the final switching switch 400. This mechanism ensures that the execution module is reliably "frozen" in the current state, thereby fundamentally eliminating any unintended control instructions that may endanger the safety of the power grid during device tampering.

[0042] Second, generate an alarm event with an accurate timestamp. When generating a security alarm event, the core control module calls the interface of the real-time clock module to read the current accurate time (for example, "2023-10-27 14:30:15.256"), and then attaches the timestamp as a key field of the alarm event to the event data packet.

[0043] Third, locally persistently store the alarm record. In order to prevent the attacker from cutting off the terminal power or communication immediately after opening the shell and causing the loss of alarm information, the core control module writes this alarm event with accurate timestamp to the on-board non-volatile memory (such as NAND Flash or eMMC). In this way, even if the device is subsequently powered off, the record will not be lost, providing irrefutable evidence for subsequent security audits and fault tracing.

[0044] Fourth, report the alarm to the remote host station. After the above operations are completed, the core control module reports this security alarm event containing the accurate timestamp to the remote host station through the remote communication module 301.

[0045] By the technical solutions of the embodiment, the security protection capability of the terminal is upgraded from "passive monitoring and alarm" to "active defense interlocking". Once the physical security boundary is breached, the control output function is immediately locked, and the evidence with accurate time is recorded, greatly enhancing the survivability and credibility of the terminal in unattended environments.

[0046] The power line carrier communication unit mentioned in the embodiments of the present application is a physically independent module or a circuit integrated on the mainboard, which is connected with the core control module through an internal bus (such as an SPI or UART interface) for receiving and sending digital data. At the same time, the signal modulation and demodulation end of the power line carrier communication unit is connected with the power line input end of the strong current connector 203 through a special coupling circuit. The coupling circuit is used to superimpose the high-frequency communication signal on the 50 Hz power frequency alternating current and isolate the power frequency high voltage to protect the communication circuit. The working process can be described as follows: Suppose the core control module needs to collect the data of a smart meter with power line carrier communication function (which can be regarded as a local device). The core control module first encapsulates the to-be-sent instruction (for example, "read the current forward active total electric energy") into a digital message according to the DL / T645 and other power industry standard protocols, and then sends the message to the power line carrier communication unit through the internal bus. After receiving the digital message, the unit converts it into a high-frequency analog signal of a specific frequency band (for example, 2-12 MHz) using modulation technologies such as orthogonal frequency division multiplexing. The high-frequency signal is injected into the power line connected to the strong current connector 203 through the coupling circuit, and propagates along the power line to the target smart meter. The power line carrier communication module at the smart meter end receives and demodulates the signal, restores the digital instruction and executes it. The response data returned by the smart meter is transmitted back through the opposite process, modulated by the power line carrier communication module of the smart meter, transmitted back through the power line, and then received, demodulated and transmitted to the core control module by the power line carrier communication unit of the terminal.

[0047] For uplink communication, the remote communication module 301 and the FE network port 202 can still be used to communicate with the remote master station, which does not interfere with the downlink power line carrier communication.

[0048] Therefore, by using power line carrier communication as the downlink communication mode, the terminal of the embodiments does not need to separately arrange communication cables for local devices, and can directly use the ubiquitous power line for data interaction, greatly simplifying the on-site construction and reducing the transformation cost, especially suitable for intelligent upgrading and transformation projects of old plants and stations, thereby showing excellent scene adaptability and expansion capability of the technical scheme of the present application.

[0049] In summary, the terminal can realize the cluster autonomy and intelligent optimization management of high-proportion distributed power sources through various data interfaces, multi-protocol communication modules, switching switches, integrated cloud-edge collaborative algorithms, and finally solve the problems of slow response, insufficient computing power, poor expansibility of traditional centralized control mode, and inability to adapt to the volatility, dispersion and real-time control difficulties brought by high-proportion distributed power sources.

[0050] It should be noted that the embodiment introduces a physical security audit mechanism, which can be jointly constituted by the state detection unit and the specific security response logic in the core control module 500.

[0051] Specifically, as shown in Figure 3 the state detection unit in the embodiment can be embodied as a flip cover opening detection port 207 and an end cover opening detection port 208 arranged on the device package shell 100. The flip cover opening detection port 207 is arranged at the joint of the edge of the flip cover 102 and the shell body, and the end cover opening detection port 208 is arranged at the joint of the end cover 104 and the shell body. The two detection ports can be realized in the form of a photoelectric pair tube (infrared emitting tube and receiving tube). In the state that the flip cover 102 and the end cover 104 are closed, the specific structure thereon will block the light path, and the photoelectric receiving tube will have no signal output; once the flip cover 102 or the end cover 104 is illegally opened, the blockage is removed, the light path is conducted, and the receiving tube will receive the signal and generate a level jump. The jump signal is the state detection signal, which is sent to the dedicated detection pin of the core control module. The shell can also be detected through the guide hole 204 to ensure that the flip cover or the end cover can be accurately aligned and trigger the detection port when closed.

[0052] In terms of local autonomous control, a typical voltage collaborative control scenario is taken as an example: the terminal continuously collects the voltage data of the power distribution network line through the strong current connector 203. It is assumed that the preset edge computing strategy stipulates that when the voltage of the monitoring point is lower than 93% of the rated voltage and lasts more than 200 milliseconds, the voltage lifting measure should be started. At a certain moment, due to the start of a nearby high-power load, the core control module calculates that the current A-phase voltage is 92% of the rated value, at which time the local edge computing strategy is triggered. The core control module will first send a control instruction to the connected photovoltaic inverter (i.e. distributed power supply) through the local communication module 302 and the RS485 interface on the weak current connector 205 according to the priority in the strategy, requiring it to increase the reactive power output within the allowed range to support the local voltage. After sending the instruction, the core control module will continuously monitor the voltage change. If the voltage has not returned to the normal range within the set time window (for example, 500 milliseconds), the strategy will enter the next stage. At this time, the core control module will drive the switching switch 400 in the execution module to act through its GPIO pin, cutting off a secondary load line (for example, by controlling a circuit breaker) pre-configured as “interruptible”. The whole process of “perception-decision-execution” is completely completed locally on the terminal, and the response time can be controlled within hundreds of milliseconds, which is much faster than the traditional mode of reporting to the master station and then issuing instructions by the master station. After the control action is completed, the terminal will package the voltage limit event, the control measures taken, the voltage and current data before and after the control, etc. into an event record, and report it to the remote master station for archiving through the remote communication module 301 and the FE network port 202.

[0053] Figure 5 A flowchart of a physical security audit method according to an embodiment of the present application.

[0054] As shown in Figure 5 the method can be applied to the power distribution network autonomous control terminal mentioned in the foregoing embodiments, and can be a continuously running background task. The method comprises the following steps: 501. Detecting whether at least a part of the device packaging shell is opened by a state detection unit arranged on the device packaging shell of the terminal, and generating a state detection signal when it is detected that the device packaging shell is opened; 502. Receiving the state detection signal by a core control module of the terminal, and generating a preset security alarm event; 503. Sending the security alarm event to a remote host system through a communication module of the terminal.

[0055] Specifically, in step 501, the state detection unit (i.e., the flip opening detection port 207 and the end cover opening detection port 208) can continuously detect the state of the device packaging shell 100. In step 502, the core control module continuously polls the signals from the two detection ports. Normally, the flip cover 102 and the end cover 104 are in a closed state, and the detection signal remains stable (e.g., low level), and the judgment result is "no", and the flow returns to step 501. Assuming that an unauthorized person tries to open the terminal for destruction or tampering, when he opens the flip cover 102 located on the front panel, the optical path of the flip cover opening detection port 207 is turned on, and the output signal of the flip cover opening detection port 207 jumps (e.g., becomes high level). The core control module immediately captures the state detection signal, and the judgment result of step 501 is "yes".

[0056] In an alternative embodiment, two independent micro switches can be used instead of the aforementioned photoelectric detection ports 207 and 208 for detecting the opening state of the flip cover 102 and the end cover 104. The installation method can be as follows: One micro switch is fixedly installed on the inner wall of the device packaging shell 100 main body adjacent to the closed position of the flip cover 102, and the mechanical contact arm of the micro switch is pressed down by the inner side edge of the completely closed flip cover 102; another micro switch is installed in a similar manner at the corresponding position of the end cover 104. The electrical terminals of the two micro switches are connected to the GPIO pins of the core control module.

[0057] The working process is adjusted accordingly as follows: when the flip cover 102 is in the fully closed state, it presses down the contact arm of the corresponding micro switch, so that the internal contact of the micro switch is in a state (for example, the normally closed contact is turned on, and the normally open contact is turned off). The GPIO pin of the core control module thus detects a stable level (for example, a high level through a pull-up resistor, and the pin is pulled to a low level after the switch is closed). When a person opens the flip cover 102, the pressure applied to the micro switch contact arm disappears, and the contact arm is reset under the action of the internal spring, causing the internal contact of the switch to reverse (the normally closed contact is turned off, and the normally open contact is turned on). This causes the level on the GPIO pin to jump (for example, from low to high), and the level jump signal is the state detection signal received by the core control module.

[0058] As another optional implementation, the state detection unit can also be implemented by using a magnetic reed switch. For example, a small permanent magnet is installed inside the edge of the flip cover 102 or the end cover 104, and a magnetic reed switch is installed at the corresponding position of the main body of the shell. When the flip cover is closed, the magnet is close to the magnetic reed switch, causing the internal reed contact to close (or open); when the flip cover is opened, the magnet is far away, and the contact returns to its original state. This state change also generates an electrical signal that can be detected by the core control module.

[0059] Once the core control module detects this signal, the subsequent safety response logic is exactly the same as in the foregoing embodiment. That is, the flow immediately enters step 502, and the core control module generates a preset safety alarm event according to the preset safety rules. The event is a structured data packet, which can include the following information: event ID, device ID, event type (for example, defined as “physical tampering alarm”), event subtype (“front panel opened”), device local time of event occurrence, and the like.

[0060] Next, in step 503, the core control module immediately calls the uplink communication unit (i.e., the remote communication module 301) in the communication module 300 to send the safety alarm event to the remote host station through the FE network port 202. After receiving the alarm message, the remote host station can immediately pop up an alarm on the monitoring interface to notify the operation and maintenance personnel that the terminal at a certain place may be physically invaded, so as to achieve timely response and disposal. Correspondingly, if the opened is the rear end cover 104, because this area involves high-voltage wiring, the danger level is higher, and the core control module will generate a higher-level alarm event (for example, the event subtype is “high-voltage compartment opened”) to prompt the operation and maintenance personnel that there is a risk of electric shock.

[0061] A human-computer interaction indicator light 103 is also arranged on the terminal, which can indicate the power supply, operation, communication and alarm states by different colored lights, so as to facilitate on-site personnel to quickly judge the basic state of the equipment. At the same time, the debugging serial port 201 can be connected to a notebook computer by authorized operation and maintenance personnel on site, so as to perform in-depth configuration and diagnosis.

[0062] The terminal of the embodiment not only realizes the rapid autonomous control of the power distribution network, but also includes the physical state of the terminal in the monitoring range. Any opening behavior to the device shell will be discovered and reported immediately, thereby greatly improving the safety protection capability of the terminal itself and the operation reliability of the entire system.

[0063] A power distribution network autonomous control terminal and method with a physical security audit function are provided in the application, which can be a power distribution network cluster autonomous control device specially used for high-proportion distributed power access. The device solves the problem of single access capability and poor expansibility of traditional terminals through diversified data interfaces (strong current, weak current and communication interface), and realizes comprehensive collection of panoramic data of the power grid. The core is that the cloud-edge collaborative algorithm is integrated, so that the terminal has local analysis and decision-making capability, can quickly respond to power grid fluctuations, and can operate independently when communication with the master station is interrupted, thereby greatly improving the real-time and reliability of control.

[0064] The multi-protocol communication module of the device ensures barrier-free interaction with different protocol devices, and the switch module ensures reliable execution of control instructions, forming a closed-loop control of "perception-decision-execution". Finally, the device realizes collaborative regulation and control of the distributed power cluster, effectively suppresses power fluctuations, improves the operation stability of the power distribution network and the new energy consumption capacity, and supports remote maintenance, thereby reducing the operation and maintenance cost.

[0065] In summary, the application solves the control problem caused by high-proportion distributed power access through the fusion of hardware platformization, software intelligentization and execution precision, systematically solves the control problem caused by high-proportion distributed power access, and promotes the development of the power distribution network to be intelligent, reliable and efficient.

[0066] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The program can be stored in a non-volatile computer readable storage medium, and when the program is executed, the processes of the above-mentioned embodiment methods can be included. Any reference to memory, storage, database or other medium used in the embodiments provided in the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0067] The technical features of the above embodiments can be combined in any way. In order to make the description simple, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0068] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A power distribution network autonomous control terminal with physical security audit function, characterized in that, The terminal comprises a device packaging shell, a data acquisition module, a communication module, an execution module, and a core control module, wherein: The data acquisition module is configured to acquire power grid operation state data of a power distribution network and working data of at least one local device connected to the power distribution network. The execution module is configured to control the operation state of an external electrical device according to a control instruction. The core control module is connected to the data acquisition module, the communication module, and the execution module, and is configured to generate the control instruction locally based on the acquired power grid operation state data and local device working data and according to a preset edge computing strategy. The terminal further comprises a state detection unit arranged on the device packaging shell and configured to detect whether at least a part of the device packaging shell is opened and generate a state detection signal. The core control module is further configured to generate a preset safety alarm event when the state detection signal is received and send the safety alarm event to a remote master station system via the communication module.

2. The power distribution network autonomous control terminal according to claim 1, characterized by, The device packaging shell comprises a main body and a flip cover or an end cover that is openably connected to the main body. The state detection unit is a detection port or a microswitch arranged at the edge of the flip cover or the end cover and configured to detect whether the flip cover or the end cover is opened.

3. The power distribution network autonomous control terminal according to claim 1, characterized by, The core control module is further configured to: inhibit the execution module from executing any control instruction when the state detection signal is received.

4. The power distribution network autonomous control terminal according to claim 3, characterized by, The terminal further comprises a real-time clock module powered by a backup battery. The core control module appends a timestamp provided by the real-time clock module to the safety alarm event when the safety alarm event is generated.

5. The power distribution grid autonomous control terminal of claim 1, wherein, The data acquisition module comprises a strong current connector and a weak current connector. The strong current connector is configured to acquire three-phase voltage, three-phase current, and zero sequence current signals as the power grid operation state data. The weak current connector is configured to receive a state signal of an external switch device or communicate with the local device via an RS485 or RS232 communication interface to acquire working data of the local device.

6. The power distribution grid autonomous control terminal of claim 1, wherein, The communication module comprises: an uplink communication unit configured to interact with the remote master station system and a downlink communication unit configured to interact with the local device.

7. The power distribution network autonomous control terminal according to claim 6, characterized in that, The downlink communication unit is a power line carrier communication unit.

8. The power distribution grid autonomous control terminal of claim 1, wherein, The core control module comprises a central processor running an embedded operating system, and the central processor is responsible for executing the edge computing strategy.

9. A physical security audit method characterized by, The method applied to the power distribution network autonomous control terminal of any one of claims 1-8 comprises the following steps: detecting, by a state detection unit arranged on a device packaging shell of the terminal, whether at least a part of the device packaging shell is opened and generating a state detection signal when it is detected that the device packaging shell is opened; receiving, by a core control module of the terminal, the state detection signal and generating a preset safety alarm event; sending, by a communication module of the terminal, the safety alarm event to a remote master station system.

10. The method of claim 9, wherein, The method further comprises: The core control module of the terminal prohibits the execution module from executing any control instruction upon receiving the state detection signal.

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