Intelligent power supply switching method suitable for power station

Abstract

The invention relates to an intelligent power supply switching method suitable for a power station, and aims at solving the problems that an existing spare power automatic switching device is low in response speed, single in starting condition, incomplete in switching-on logic and the like. According to the invention, parameters such as voltage, frequency, phase and current of the power supply are monitored in real time, and various switching logics such as rapid closing, synchronous capture closing, residual voltage closing and long delay closing are combined, so that rapid and safe switching between the main power supply and the standby power supply is realized. The system supports various triggering modes such as manual starting, protection starting, voltage loss starting, reverse power starting and non-current starting, and can adapt to complex scenes such as single-bus segmentation, single-bus and isolated network operation. Through an embedded hardware platform, a DSP + ARM + CPLD architecture is adopted, the system has efficient data acquisition and logic operation capability, and the switching time can be shortened to be within 10 milliseconds. Meanwhile, multiple safety mechanisms such as overcurrent protection, reverse power protection and decoupling protection are provided, and misoperation and parallel operation risks in the switching process are avoided.

Description

Technical Field

[0001] The present invention relates to the field of power system automation and control technology, and in particular to an intelligent power supply switching method suitable for a power station. Background Art

[0002] With the acceleration of industrialization, the power system has become increasingly important in the economic and social fields. For power stations and large industrial enterprises, a reliable power supply system not only directly affects production efficiency, but also has an important impact on the safety and economic benefits of equipment. Especially in industries such as petrochemicals and metallurgy that require high continuous power supply, power switching devices have become an indispensable key equipment in power systems. At present, traditional power switching methods have exposed many shortcomings in practical applications and are difficult to meet the needs of increasingly complex industrial scenarios.

[0003] Existing power switching devices usually use a backup automatic switch device (backup power automatic switch device), whose main function is to automatically connect the backup power supply to the power grid when the main power fails to ensure the continuity of power supply. The backup automatic switch device generally implements switching operations based on voltage loss detection and simple logic control, and avoids false operation through fixed delay logic. This device is widely used in general industrial enterprises and civil power grids. However, with the complexity of industrial scenarios and the increase in power load, the limitations of existing backup automatic switch technology have become more and more obvious.

[0004] It usually takes 1-2 seconds or even longer for traditional backup automatic switching devices to detect the failure of the main power supply and complete the switching of the backup power supply. This delay makes it difficult to meet the continuous power supply requirements of industries such as petrochemicals and metallurgy. For example, in the metallurgical industry, delayed switching will cause the motor speed to drop rapidly, thus affecting the normal operation of the equipment and the continuity of the production process. At the same time, too long a delay may also cause a large self-starting current of the equipment, causing an impact on the power grid.

[0005] In the prior art, the backup automatic switching device usually uses voltage loss as the starting condition. However, in some scenarios, voltage loss alone is not enough to accurately reflect the fault of the main power supply. For example:

[0006] In the isolated grid operation mode, the voltage may be normal but the frequency has seriously deviated from the rated value;

[0007] In the case of reverse power or no current in the main power supply, the system cannot detect the fault in time, resulting in switching failure or delay. This single start condition design limits the scope of application of the device.

[0008] Traditional backup automatic switching devices usually rely on simple delay logic or low voltage detection for closing operations, ignoring the judgment of real-time synchronization conditions. In complex industrial scenarios, closing operations need to consider the synchronization of voltage, frequency and phase between power sources. If there is a lack of effective synchronous closing logic, it may lead to:

[0009] When the backup power supply is switched on, a phase reversal or a large phase difference occurs, causing severe inrush current;

[0010] Closing the circuit breaker when the residual voltage on the busbar has not been completely eliminated may cause the motor to be impacted or even damaged.

[0011] The existing automatic backup devices have limited anti-interference capabilities in complex industrial environments. In industries such as petrochemicals and metallurgy, complex factors such as electromagnetic interference and high-frequency noise often exist in the power system, which may cause the automatic backup devices to malfunction or refuse to operate, affecting the stability of the system. At the same time, the hardware architecture design of traditional automatic backup devices is outdated, lacking advanced anti-interference technology and fault self-diagnosis capabilities, making it difficult to adapt to the requirements of modern industrial environments.

[0012] Traditional backup automatic switching devices are usually designed for specific power supply systems or wiring methods, and are difficult to adapt to a variety of power supply scenarios. For example:

[0013] In the single-bus sectionalized wiring mode, it is difficult for the backup automatic switching device to achieve flexible switching between busbars;

[0014] In complex systems that require multiple startup modes, existing technologies require a lot of manual adjustments, increasing maintenance costs and operational complexity. When the wiring method or operating conditions of the power supply system change, existing devices usually require hardware changes or complex parameter configurations, limiting their flexibility.

[0015] Traditional backup automatic switching devices lack a complete information recording function, and cannot record the triggering conditions, processes, and results of each switch in detail. This makes it difficult to conduct effective accident analysis after a fault occurs, limiting the optimization and improvement of the system. In addition, the information interaction capabilities of existing devices are weak, making it difficult to meet the needs of modern industry for remote monitoring, data export, and centralized management.

[0016] In the metallurgical and petrochemical industries, the loads are mostly induction motors, which have high requirements for power switching time and electrical parameter stability. The existing automatic backup devices in these industries have the following problems:

[0017] Serious impact on important high-voltage equipment: Delayed switching may cause the operating status of high-voltage equipment to deteriorate, increasing the risk of equipment shutdown or damage.

[0018] Difficulty in starting loads in stages: Due to the lack of staged start-up logic, the load cannot be gradually restored according to the backup power supply capacity, which can easily cause the backup power supply to overload.

[0019] Poor adaptability of isolated grid operation mode: Existing devices cannot achieve effective switching for isolated grid characteristics such as frequency deviation and power reversal, and it is difficult to meet the needs of isolated grid operation.

[0020] In view of the above problems, modern power switching devices need to be improved in the following aspects:

[0021] Improve response speed: Through efficient logic algorithms and fast hardware platforms, the time from fault detection to backup power supply input is shortened, ensuring that the switching time is less than 10 milliseconds.

[0022] Increase the starting mode: introduce multiple starting conditions such as reverse power, no current and abnormal frequency and voltage to improve the scope of application.

[0023] Optimize closing logic: Realize synchronous switching between power sources through fast closing, synchronous capture closing, etc. to reduce impact current.

[0024] Enhanced anti-interference capability: Advanced anti-interference design is adopted to improve the stability of the device in complex industrial environments.

[0025] Improve flexibility and adaptability: Support multiple wiring methods and operating conditions, and achieve functional expansion and flexible configuration through modular design.

[0026] Improve information recording and analysis functions: support wave recording, event recording and remote data interaction, and provide support for accident analysis and system optimization.

[0027] In summary, the existing technology has significant deficiencies in switching speed, starting conditions, closing logic, anti-interference ability, flexibility and information recording function. Therefore, we urgently need to design an intelligent power switching method suitable for power stations to solve the above problems. Summary of the invention

[0028] An intelligent power switching method applicable to a power station, the method comprising:

[0029] Real-time monitoring and data acquisition: real-time monitoring of the voltage, frequency, phase and current electrical parameters of the main power supply and backup power supply;

[0030] Start-up condition determination: Based on the monitoring data, the main power failure is determined through multiple trigger conditions such as loss of voltage, no current, and reverse power, and the backup power supply is triggered;

[0031] Switching logic execution: Based on parallel switching, series switching or simultaneous switching, the switching from the main power supply to the backup power supply is completed through fast closing, synchronous capture closing, residual pressure closing or long delay closing logic;

[0032] Dynamic parameter adjustment: Dynamically adjust switching parameters according to real-time monitored power status and load characteristics to optimize switching performance;

[0033] Safety interlocking mechanism: When abnormal conditions are detected, including main power overcurrent, reverse power or busbar disconnection, the switching operation is automatically interlocked and an alarm signal is issued.

[0034] As a preferred technical solution of the present invention, the method supports multiple startup modes, including but not limited to:

[0035] Manual start: The switching process is triggered by the operator input signal, which is used for power supply maintenance or switching under special working conditions;

[0036] Protection start: When the protection action signal of the equipment on the main power supply side is detected, the backup power supply is immediately triggered;

[0037] Loss of voltage start: trigger switching when the main power bus voltage is detected to be lower than the set threshold (20%-35% rated voltage);

[0038] Reverse power start: trigger switching when the power direction of the main power supply is reversed and the voltage is lower than the set threshold;

[0039] No-current start: trigger switching when it is detected that the main power current drops below the set no-current setting value.

[0040] As a preferred technical solution of the present invention, the switching mode of the method includes:

[0041] Parallel switching: real-time synchronization of the voltage, frequency and phase of the main power supply and the backup power supply. When the synchronization conditions are met, the backup power supply is switched on first, and then the main power supply is disconnected.

[0042] Series switching: first disconnect the main power supply, then switch on the backup power supply. This is used for switching when the main power supply fails or when the synchronization conditions are not met.

[0043] Simultaneous switching: The main power source tripping and backup power source closing commands are issued simultaneously with a preset delay to minimize busbar power outage time.

[0044] As a preferred technical solution of the present invention, the closing conditions of the method include:

[0045] Fast closing: When the frequency difference, phase difference and voltage difference between the main power supply and the backup power supply are less than the set fast closing threshold, the backup power supply is closed immediately;

[0046] Synchronous capture closing: By real-time tracking of the electrical parameters of the busbar and backup power supply, the closing is completed when the two reach the same phase point;

[0047] Residual voltage closing: When the bus voltage drops to between 20% and 40% of the rated voltage, the backup power supply is closed;

[0048] Long-delay closing: When the backup power capacity is insufficient to bear all the loads, the closing is delayed for a certain period of time.

[0049] As a preferred technical solution of the present invention, the method adopts multiple security protection measures during the switching process, including:

[0050] Overcurrent protection: When overcurrent is detected in the main power supply, the backup power supply closing operation is locked;

[0051] Reverse power protection: When the main power is detected to be reverse, an alarm is activated and the switching operation is locked;

[0052] Bus voltage loss detection: When the bus voltage is lower than the set value, switching or alarm is triggered;

[0053] Decoupling protection: When it is detected that the backup power supply is closed successfully but the main power supply is not tripped, the backup power supply is automatically tripped to avoid the two power supplies being in parallel for a long time.

[0054] As a preferred technical solution of the present invention, the method uses an embedded hardware platform, integrates a DSP+ARM+CPLD processor, and has the following hardware capabilities:

[0055] High-precision data acquisition: supports sampling frequency up to 20kHz, voltage measurement error less than 0.5%, frequency error less than 0.03Hz;

[0056] Fast logic operation: parallel computing technology is used to ensure that the switching delay is less than 10 milliseconds;

[0057] Anti-interference design: passed the highest level of EMC testing and adapted to complex industrial electromagnetic environments.

[0058] As a preferred technical solution of the present invention, the method supports multiple communication interfaces and protocols, including:

[0059] Ethernet and RS485 communication interface;

[0060] Support IEC60870-5-103, IEC61850 and Modbus protocols;

[0061] Remote monitoring, parameter setting and data export are achieved through the communication interface.

[0062] As a preferred technical solution of the present invention, the method has perfect information recording and fault analysis functions, including:

[0063] Action event record: record the triggering conditions and execution steps of each switch;

[0064] Fault recording: record the voltage, frequency and current data of 250 cycles before and after switching, in line with COMTRADE99 standard;

[0065] Real-time alarm: LED indicator lights and LCD screen will indicate the operation status and fault information.

[0066] As a preferred technical solution of the present invention, the device supports modular configuration, which is flexibly adapted to single-mother segmented mode and single-mother mode power supply system, specifically:

[0067] In single bus sectional mode, it supports backup power supply switching between multiple bus sections;

[0068] In single-mother mode, it supports backup power supply switching between different incoming lines.

[0069] As a preferred technical solution of the present invention, the method has user-friendly operation and maintenance characteristics, including:

[0070] Equipped with Chinese LCD display interface, supporting menu navigation and parameter configuration;

[0071] Provides a remote debugging interface, which can export device operation reports, event records and waveform data in real time through a computer;

[0072] It has a self-diagnosis function, which can detect the operating status of hardware and software in real time. When a fault is found, it will send a lock signal and prompt the user.

[0073] In summary:

[0074] The present invention significantly improves the response speed of power switching by real-time monitoring of the electrical parameters of the main power supply and the backup power supply, and combines a variety of switching logics (fast closing, synchronous capture closing, etc.), and the switching time can be shortened to less than 10 milliseconds. Compared with the traditional automatic backup device, the present invention can quickly restore power supply after the main power failure, avoiding problems such as motor shutdown, process interruption and equipment damage caused by delayed switching. At the same time, synchronous detection and dynamic protection mechanisms are added during the switching process to ensure the safe operation of the motor and the power grid.

[0075] The present invention supports multiple triggering modes such as manual start, protection start, voltage loss start, reverse power start and no-current start, etc., to meet the needs of different power supply scenarios; at the same time, it provides three modes of parallel switching, series switching and simultaneous switching, combined with closing logic such as fast closing and residual pressure closing, which can meet the application requirements of complex wiring modes such as single mother segmentation, single mother and isolated network operation. In addition, the modular design of the present invention enables it to flexibly adjust parameters and functions to adapt to changes in wiring methods and complex requirements of industrial environments.

[0076] The present invention provides multiple safety mechanisms such as overcurrent protection, reverse power protection and decoupling protection, which effectively avoid the risks of mis-switching and parallel operation. At the same time, through high-precision wave recording and detailed event records, users can fully understand the operating status before and after the switch, which is convenient for fault analysis and system optimization. The supported remote communication and debugging functions (such as IEC61850 and Modbus protocols) further enhance the monitoring capability and operation and maintenance efficiency of the system, and can be widely used in industrial fields such as petrochemicals and metallurgy that have high requirements for continuous power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0078] Figure 1 The present invention is a method flow chart of an intelligent power switching method applicable to a power station. DETAILED DESCRIPTION

[0079] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0080] The following is combined with Figure 1 The specific embodiments of the present invention are described in detail with reference to the accompanying drawings and examples.

[0081] 1. System overall architecture:

[0082] In this embodiment, the system architecture of the intelligent power switching method includes the following parts:

[0083] Data acquisition module: real-time monitoring of electrical parameters such as voltage, frequency, phase and current.

[0084] Logical operation and judgment module: Based on the collected data, according to the preset switching conditions and logic, it determines whether to execute the switching.

[0085] Control execution module: controls the main power switch to trip and the backup power switch to close according to the logic operation results.

[0086] Communication and display module: used for remote monitoring, data export and local user interface interaction.

[0087] Information recording and fault analysis module: record, log and store the switching process and fault events.

[0088] 2. System Function Description:

[0089] 1. Data collection and real-time monitoring:

[0090] This system uses an embedded hardware platform, integrates a high-precision AD converter, and works together with DSP+ARM+CPLD to achieve the following monitoring functions:

[0091] Voltage measurement: Collect the voltage values ​​of the main power supply and backup power supply with an accuracy of ±0.5%.

[0092] Frequency measurement: monitor frequency changes with an accuracy of ±0.03Hz.

[0093] Phase measurement: Measures the phase difference between the main power supply and the backup power supply with an accuracy of ±0.5 degrees.

[0094] Current measurement: Real-time monitoring of current to determine whether there is no current or overcurrent.

[0095] 2. Start condition determination:

[0096] According to the various startup methods described, the system triggers the switching operation based on the following conditions:

[0097] Loss of voltage start: When the main power bus voltage is lower than the set value (generally 20%-35% of the rated voltage), the backup power supply is triggered.

[0098] No-current start: When the main power supply current is less than the no-current setting value and the bus frequency is abnormal, the switching is triggered.

[0099] Reverse power start: When the main power direction is reversed and the voltage is lower than the reverse power setting value, the switching is started.

[0100] Protection start: When the equipment protection signal on the main power supply side is activated, the backup power supply is immediately triggered.

[0101] 3. This implementation provides three switching modes:

[0102] Parallel switching: When the frequency, phase difference, and voltage difference between the main power supply and the backup power supply meet the preset conditions, the backup power supply is switched on first, and then the main power supply is switched off. This is suitable for scenarios with good power synchronization performance.

[0103] Series switching: After the main power supply trips, the backup power supply is closed again to ensure the safety of the switching process. It is suitable for scenarios where the main power supply fails or the synchronization conditions are not met.

[0104] Simultaneous switching: When the main power supply is disconnected, the backup power supply is switched on to shorten the busbar power-off time. This method needs to be combined with real-time monitoring results to avoid misoperation.

[0105] 4. Closing logic is divided into the following four types:

[0106] Fast closing: When the frequency difference, phase difference and voltage difference are less than the set thresholds, the closing operation is completed immediately to ensure the safe operation of the motor.

[0107] Synchronous capture closing: Real-time monitoring of the frequency and phase changes of the main power supply and the backup power supply, and closing when the same phase point is reached.

[0108] Residual voltage closing: closing when the bus voltage decays to between 20% and 40% of the rated voltage.

[0109] Long-delay closing: When the backup power capacity is insufficient, closing is completed through delayed operation.

[0110] 5. The system has built-in multiple safety protection mechanisms to ensure safe and reliable switching operations:

[0111] Overcurrent protection: When the main power supply or backup power supply detects an overcurrent condition, the switching operation is locked and an alarm is issued.

[0112] Reverse power protection: When the power direction of the main power supply is reversed, the backup power supply is locked.

[0113] Decoupling protection: If the backup power supply is closed and the main power supply is not tripped, the system will trip the backup power supply to avoid long-term parallel operation.

[0114] Bus voltage loss detection: Real-time monitoring of bus voltage status to determine whether to trigger a voltage loss alarm or switch.

[0115] 6. The system has powerful data recording and analysis functions:

[0116] Event logging: records the triggering conditions, execution steps, and switch status of each switch.

[0117] Fault recording: record the voltage, frequency and current data of 250 cycles before and after switching, and store them in COMTRADE99 format file.

[0118] Alarm log: saves all alarm events for later fault analysis and optimization.

[0119] 7. Through RS485 and Ethernet interfaces, it supports multiple industrial standard protocols (IEC60870-5-103, IEC61850, Modbus) and realizes the following functions:

[0120] Remote monitoring: view system operation status, alarm information and electrical parameters in real time.

[0121] Parameter setting: Adjust the switching logic and protection parameters through the remote interface or local LCD interface.

[0122] Data export: export event records, waveform data and equipment operation logs.

[0123] 3. Implementation examples;

[0124] Example 1: Fast switching of a single-bus segmented power supply system;

[0125] In the petrochemical industry, a single busbar segmented power supply is used, with incoming line 1 (main power) and incoming line 2 (backup power) supplying busbar 1 and busbar 2 respectively. When incoming line 1 fails and busbar 1 loses pressure, the system completes a rapid switch according to the following process:

[0126] Fault detection: Real-time monitoring shows that the bus 1 voltage is lower than 30% of the rated value, and the bus is judged to be depressurized.

[0127] Backup power supply input: through the fast closing logic to determine the backup power supply (incoming line 2) and bus 1 frequency difference, phase difference and voltage difference meet the set threshold, immediately close the bus tie breaker (3DL).

[0128] Main power supply tripped: After confirming that the backup power supply is operating normally, disconnect the incoming line 1 switch (1DL) and bus 1 resumes power supply.

[0129] Event recording: The voltage, frequency, phase change and switching time of the switching process are fully recorded for subsequent analysis.

[0130] Embodiment 2: Reverse power switching in single mother operation mode;

[0131] In metallurgical enterprises, a single-mother power supply is used, the main power supply is incoming line 1, and the backup power supply is incoming line 2. When incoming line 1 causes reverse power due to equipment abnormality, the system performs the following operations:

[0132] Reverse power trigger: When the power direction of incoming line 1 is detected to be reversed in real time and the voltage is lower than the reverse power setting value, the system triggers the switching operation.

[0133] Switching logic: According to the series switching method, first open the switch of incoming line 1 (1DL), and then close the switch of the backup power supply (2DL).

[0134] Protection mechanism: If the main power supply refuses to trip after the backup power supply is put into operation, the system will automatically trip the backup power supply through decoupling protection logic to avoid long-term parallel operation of the two power supplies.

[0135] Power supply restoration: After confirming that the backup power supply is stable, record the switching event and restore the normal power supply status.

[0136] Example 3: Parallel switching is used for maintenance scenarios;

[0137] When performing maintenance on electrical equipment in power companies, parallel switching is required to ensure the continuity of power supply during maintenance:

[0138] Parallel condition detection: The system monitors the voltage, frequency and phase of incoming line 1 and incoming line 2 in real time. When the parallel switching conditions are met, the operator manually triggers the switching.

[0139] Backup power supply input: first close the backup power supply switch (2DL) to achieve short-term parallel operation of incoming line 1 and incoming line 2.

[0140] The main power supply is tripped: After confirming that the backup power supply is normal, disconnect the switch of incoming line 1 (1DL).

[0141] Operation switching: The backup power supply takes over the power supply, completing the disturbance-free switching process of equipment maintenance.

[0142] Example 4: Residual pressure closing scenario;

[0143] In the high-voltage equipment power supply system, when the main power failure causes the bus voltage to drop to the range of 20%-40%, the system completes the switch through the residual voltage closing logic:

[0144] Bus residual voltage detection: When the bus voltage is monitored to drop to 30% of the rated value, it is determined that the residual voltage closing conditions are met.

[0145] Backup power supply input: The system determines that the backup power supply voltage is normal and executes the series switching logic.

[0146] Motor protection: During the switching process, the system performs protective control on the motor to prevent the self-starting current from impacting the bus.

[0147] Delayed recovery: After the backup power supply is put into use, the current and time data of the motor startup are recorded to ensure that the system resumes stable operation.

[0148] Example 5: Long-delay closing is used in the scenario of insufficient capacity;

[0149] In the scenario where the backup power supply capacity is insufficient, long-delay closing is used to ensure power supply safety:

[0150] Load assessment: The system detects that the backup power capacity is insufficient to carry the entire load and automatically delays switching through logic.

[0151] Gradually restore the load: After the delay ends, the backup power supply is gradually put into use to avoid excessive inrush current that may affect system stability.

[0152] Operation optimization: After the switch is completed, the system records the load recovery curve and backup power current changes for subsequent optimization analysis.

[0153] Example 6: Isolated grid operation scenario with frequency and voltage activation;

[0154] In some industrial parks, when the main power supply disappears due to an external grid failure and the load switches to isolated grid operation mode, the system completes the switch according to the frequency and voltage start logic:

[0155] Frequency and voltage anomaly detection: When the main power frequency deviates from the operating frequency and the bus voltage is lower than the set value, the system triggers the frequency and voltage start conditions.

[0156] Backup power supply closing: After the system determines that the backup power supply is in normal status, it executes the series switching logic and quickly closes the backup power supply.

[0157] Isolated network protection: During the switching process, the isolated network equipment is protected through the locking logic to avoid equipment damage due to incorrect switching.

[0158] Example 7: Information recording in the automation industry;

[0159] In an automated factory, the recording and analysis of information during the switching process is crucial. The system completes the following recording operations after the switch:

[0160] Event record: record the switching trigger conditions, trigger time and switch status changes.

[0161] Recording data: record the voltage, frequency and current changes of 250 cycles before and after switching, and the data format complies with COMTRADE99 standard.

[0162] Alarm prompt: Alarm information is issued through remote communication and local interface to prompt the operator to conduct further inspection.

[0163] Data export: Operators export data via USB or remote interface for subsequent accident analysis and optimization.

[0164] Embodiment 8: Communication and remote monitoring application;

[0165] In the power system, RS485 and Ethernet communication interfaces are used to achieve remote monitoring:

[0166] Real-time monitoring: View system operation status, switching conditions and parameter changes in real time through the IEC61850 protocol.

[0167] Remote adjustment: Adjust the backup power supply switching parameters through the remote interface, such as delay, voltage difference and frequency difference setting values.

[0168] Historical data viewing: Export switching event records and fault recording data in the monitoring center to facilitate centralized management and optimization.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent power switching method applicable to a power station, characterized in that: The method includes: Real-time monitoring and data acquisition: real-time monitoring of the voltage, frequency, phase and current electrical parameters of the main power supply and backup power supply; Start-up condition determination: Based on the monitoring data, the main power failure is determined through multiple trigger conditions such as loss of voltage, no current, and reverse power, and the backup power supply is triggered; Switching logic execution: Based on parallel switching, series switching or simultaneous switching, the switching from the main power supply to the backup power supply is completed through fast closing, synchronous capture closing, residual pressure closing or long delay closing logic; Dynamic parameter adjustment: Dynamically adjust switching parameters according to real-time monitored power status and load characteristics to optimize switching performance; Safety interlocking mechanism: When abnormal conditions are detected, including main power overcurrent, reverse power or busbar disconnection, the switching operation is automatically interlocked and an alarm signal is issued.

2. The intelligent power switching method applicable to a power station according to claim 1, characterized in that: This method supports multiple startup methods, including but not limited to: Manual start: The switching process is triggered by the operator input signal, which is used for power supply maintenance or switching under special working conditions; Protection start: When the protection action signal of the equipment on the main power supply side is detected, the backup power supply is immediately triggered; Loss of voltage start: trigger switching when the main power bus voltage is detected to be lower than the set threshold (20%-35% rated voltage); Reverse power start: trigger switching when the power direction of the main power supply is reversed and the voltage is lower than the set threshold; No-current start: trigger switching when it is detected that the main power current drops below the set no-current setting value.

3. The intelligent power switching method applicable to a power station according to claim 1, characterized in that: The switching modes of this method include: Parallel switching: real-time synchronization of the voltage, frequency and phase of the main power supply and the backup power supply. When the synchronization conditions are met, the backup power supply is switched on first, and then the main power supply is disconnected. Series switching: first disconnect the main power supply, then switch on the backup power supply. This is used for switching when the main power supply fails or when the synchronization conditions are not met. Simultaneous switching: The main power source tripping and backup power source closing commands are issued simultaneously with a preset delay to minimize busbar power outage time.

4. The intelligent power switching method applicable to a power station according to claim 1, characterized in that: The closing conditions of this method include: Fast closing: When the frequency difference, phase difference and voltage difference between the main power supply and the backup power supply are less than the set fast closing threshold, the backup power supply is closed immediately; Synchronous capture closing: By real-time tracking of the electrical parameters of the busbar and backup power supply, the closing is completed when the two reach the same phase point; Residual voltage closing: When the bus voltage drops to between 20% and 40% of the rated voltage, the backup power supply is closed; Long-delay closing: When the backup power capacity is insufficient to bear all the loads, the closing is delayed for a certain period of time.

5. The intelligent power switching method applicable to a power station according to claim 1, characterized in that: This method uses multiple security protection measures during the switching process, including: Overcurrent protection: When overcurrent is detected in the main power supply, the backup power supply closing operation is locked; Reverse power protection: When the main power is detected to be reverse, an alarm is activated and the switching operation is locked; Bus voltage loss detection: When the bus voltage is lower than the set value, switching or alarm is triggered; Decoupling protection: When it is detected that the backup power supply is closed successfully but the main power supply is not tripped, the backup power supply is automatically tripped to avoid the two power supplies being in parallel for a long time.

6. The intelligent power switching method applicable to a power station according to claim 1, characterized in that: This method uses an embedded hardware platform that integrates DSP+ARM+CPLD processors and has the following hardware capabilities: High-precision data acquisition: supports sampling frequency up to 20kHz, voltage measurement error less than 0.5%, frequency error less than 0.03Hz; Fast logic operation: parallel computing technology is used to ensure that the switching delay is less than 10 milliseconds; Anti-interference design: passed the highest level of EMC testing and adapted to complex industrial electromagnetic environments.

7. The intelligent power switching method applicable to a power station according to claim 1, characterized in that: This method supports a variety of communication interfaces and protocols, including: Ethernet and RS485 communication interface; Support IEC60870-5-103, IEC61850 and Modbus protocols; Remote monitoring, parameter setting and data export are achieved through the communication interface.

8. The intelligent power switching method applicable to a power station according to claim 1, characterized in that: This method has complete information recording and fault analysis functions, including: Action event record: record the triggering conditions and execution steps of each switch; Fault recording: record the voltage, frequency and current data of 250 cycles before and after switching, in line with COMTRADE99 standard; Real-time alarm: LED indicator lights and LCD screen will indicate the operation status and fault information.

9. The intelligent power switching method according to claim 1, characterized in that: The device supports modular configuration, which is flexibly adapted to single-mother segmented and single-mother power supply systems, specifically: In single bus sectional mode, it supports backup power supply switching between multiple bus sections; In single-mother mode, it supports backup power supply switching between different incoming lines.

10. The intelligent power switching method according to claim 1, characterized in that: The method offers user-friendly operation and maintenance features, including: Equipped with Chinese LCD display interface, supporting menu navigation and parameter configuration; Provides a remote debugging interface, which can export device operation reports, event records and waveform data in real time through a computer; It has a self-diagnosis function, which can detect the operating status of hardware and software in real time. When a fault is found, it will send a lock signal and prompt the user.

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