One-key start control system of thermal power generating unit

Abstract

The invention relates to the technical field of thermal power generating unit generator control, provides a thermal power generating unit one-key start control system, and aims to simplify the grid-connected operation process, shorten the grid-connected time and reduce the misoperation risk. According to the system, the thermal power generating unit control end, the background control end and the generator end are in communication connection, automatic excitation input, magnetic increasing, no-load parameter checking, synchronous operation and state monitoring are achieved, background starting tasks can be received, the grid connection process can be automatically completed, manual intervention is reduced, and operation safety and efficiency are improved. Meanwhile, an optimization algorithm is integrated, the state of the generator is monitored in real time, the system operates stably, the intelligent level of the thermal power generating unit is remarkably improved, and the flexibility and reliability of the power system are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power generator control, and in particular to a one-key start control system for a thermal power generator aimed at optimizing and simplifying a generator grid-connected operation process. Background Art

[0002] Thermal power units refer to a set of power generation equipment that uses the heat energy generated by the combustion of fossil fuels such as coal, oil, and natural gas to convert it into mechanical energy, which then drives the generator to generate electricity. It is one of the most important power generation methods in the power industry and is widely used in power systems around the world.

[0003] Thermal power units are usually composed of boilers, steam turbines, generators and related auxiliary equipment. The boiler is responsible for converting the chemical energy of the fuel into thermal energy, heating water to produce high-temperature and high-pressure steam; the steam turbine uses the thermal energy of the steam to drive the rotor to rotate, which is then converted into mechanical energy; finally, the generator converts the mechanical energy into electrical energy.

[0004] Thermal power units have the advantages of large power generation, good stability, and mature technology, but they also face problems such as high energy consumption and environmental pollution. With the development of technology, modern thermal power units continue to adopt more efficient combustion technology, pollutant emission control technology, and waste heat recovery technology to improve energy efficiency and reduce environmental impact.

[0005] The following technical pain points exist in the actual use of thermal power generators. The conventional 300MW unit generator grid-connected operation first confirms that the steam turbine is at a constant speed of 3000r / min and the boiler is ready for grid connection. Check that the protection plate of the generator-transformer protection device is correctly put into operation. Confirm that the three-phase circuit breaker at the generator outlet is disconnected. Confirm that the grounding switches on both sides of the main transformer outlet disconnector are in the open position. Close the main transformer outlet disconnector and confirm that the main transformer outlet disconnector is closed. Confirm that the operating air pressure and SF6 pressure of the generator outlet circuit breaker are normal, and close the operating power supply of the outlet circuit breaker. The operating air pressure of the circuit breaker is 1.5-1.6MPa, and the SF6 pressure is above 0.5MPa. Put the main transformer and high-voltage transformer cooler into operation. After the main transformer cooler is put into operation, pay attention to check that the oil flow indicator indicates the "flow" state. The main transformer cooler group 2 is put into "operation", group 1 is put into "auxiliary", and group 1 is put into "standby". The high-voltage transformer cooler is put into "automatic". Close the generator excitation regulator and demagnetization switch control power supply. Check that the rectifier screen fan power supply is in the "closed" position. Check that the generator PT secondary switch is in the "closed" position, the PT primary trolley is in the "working" position, and the secondary plug-in is plugged in. Check that the high-voltage transformer branch PT is in the "working" position and the secondary switch is in the "closed" position. Select the excitation control switch to the "remote" position, turn the excitation regulator to the "automatic" position, close the generator demagnetization switch, and confirm that the switch is closed. Click "Enable" in the "Excitation Entry / Exit" operation terminal on the excitation system CRT screen, and "Execute" to check that the generator voltage has been established, and verify that the generator no-load excitation voltage and excitation current are normal. Check that the synchronization device is normal, and put the DC power supply of the synchronization device into operation. Adjust the generator voltage and speed so that the generator voltage, frequency, and phase angle meet the grid-connected conditions. Set the synchronization screen DTK selection switch to the "DCS" position. Click "Power on", "Execute" in the ASS operation terminal on the CRT screen of the excitation system. Click "Power on", "Execute" in the ASS operation terminal on the CRT screen of the excitation system. Check that the automatic quasi-synchronous device of the unit is operating normally, and click "Close" and "Execute" in the ASS operation terminal on the CRT screen of the excitation system. Check that the 500KV export circuit breaker is indeed closed. Check that the active and reactive loads of the generator are normal. The three-phase current is normal. Select the "Exit" position of the DTK selection switch on the synchronization screen. Exit the start-stop, wrong power-on, and flashover pressure plate of the generator A and B cabinets. It takes more than 20 minutes to complete the above steps.

[0006] The operation is cumbersome and complicated. The grid-connected operation involves multiple steps, including turbine speed confirmation, protection device inspection, circuit breaker and disconnector operation, air pressure and power supply inspection, cooler input, excitation system and PT inspection, excitation control, synchronization device operation, etc. The whole process is cumbersome and requires precise operation.

[0007] It takes more than 20 minutes to complete the entire grid-connected operation, which not only increases the labor intensity of operators, but also affects the response speed and efficiency of the power system.

[0008] Easy to operate incorrectly. Since the operation steps are numerous and complicated, operators are prone to make mistakes during the operation, resulting in wrong operation, which may affect the safe operation of the unit and the stability of the power system.

[0009] High dependence on manual labor. Grid-connected operations are highly dependent on manual operations and lack the support of automation and intelligent means, making it difficult to achieve remote monitoring and automatic control.

[0010] To sum up, the technical pain points of existing technologies mainly include cumbersome and complicated operations, time-consuming, easy to make mistakes and high dependence on manual operations, which not only affect the efficiency and accuracy of grid-connected operations, but also pose a potential threat to the stability and security of the power system. Summary of the invention

[0011] In view of the deficiencies in the prior art, the present invention provides a one-key start control system for a thermal power unit, which solves the problems of the existing thermal power unit generator being complicated and time-consuming to operate, prone to misoperation, and highly dependent on manual labor.

[0012] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0013] The present invention provides a one-key start control system for a thermal power unit, comprising: a thermal power unit control terminal, a background control terminal and a thermal power unit generator terminal, wherein the thermal power unit control terminal establishes a communication connection with the background control terminal and the thermal power unit generator terminal, and the thermal power unit control terminal comprises:

[0014] A startup task receiving unit receives a startup task of a thermal power unit controlled by a background, analyzes the startup task of the thermal power unit, obtains a preset value of operation of the thermal power unit and a startup command of the thermal power unit, wherein the preset value of operation of the thermal power unit includes a preset value of voltage of a generator of the thermal power unit and a preset value of current of a generator of the thermal power unit;

[0015] The excitation input module receives the preset operation value of the thermal power unit and the start-up command of the thermal power unit, and is used to control the FMK to automatically close the switch through the DCS system, so that the voltage of the thermal power unit generator rises to the preset value, and at the same time detects whether the three-phase current and voltage of the generator stator meet the preset values, confirming that the thermal power unit generator is in normal state;

[0016] Automatic magnetization module, when the generator of the thermal power unit is in normal state, is used to perform magnetization until the voltage of the generator of the thermal power unit reaches the set value, detect the voltage during the magnetization process, and stop magnetization after reaching the set value;

[0017] The no-load parameter inspection module checks whether the excitation voltage and current of the generator under no-load condition are within the normal range after the generator terminal voltage reaches the preset value, and obtains the no-load parameter inspection result;

[0018] The synchronous operation module, if the no-load parameter check result is qualified, sends a synchronization request to the excitation input module, the automatic magnetization module and the no-load parameter check module for the synchronous operation process of the thermal power generator being connected to the power grid until the closing operation is completed;

[0019] The status monitoring module monitors the status of the thermal power unit generator and the operation process of the thermal power unit generator. The status of the thermal power unit generator includes voltage, current and speed. The operation process of the thermal power unit generator includes the power supply and synchronous voltage input status. After monitoring that the thermal power unit generator is closed, unauthorized repeated operations are prohibited by locking the sequential control.

[0020] Furthermore, in the one-key start control system for a thermal power unit provided by the present invention, the excitation input module is also used for:

[0021] Receive the thermal power unit operation preset value and the thermal power unit start-up command;

[0022] The DCS system controls the FMK to automatically close, so that the voltage of the thermal power generator increases to 95% of the preset value;

[0023] At the same time, detect the three-phase current and voltage of the stator of the thermal power unit generator, so that the thermal power unit generator is in no-load and stable state. The three-phase current of the stator of the thermal power unit generator should be zero. The three-phase current of the stator of the thermal power unit generator includes A, B, and C phases, and A, B, and C phases are all <10A;

[0024] The three-phase voltage of the stator of the thermal power unit generator should be balanced, and the difference between any two of AB, BC and CA should be less than 0.2kV;

[0025] Detect whether the generator rotor has grounding anomaly and no rotor grounding signal.

[0026] Furthermore, in the one-key start control system for a thermal power unit provided by the present invention, the automatic magnetization module is also used for:

[0027] After confirming that the stator current of the thermal power unit generator is zero and the voltage is balanced, the magnetization operation is performed;

[0028] During the magnetization process, the voltage is tested regularly until the voltage of the thermal power generator reaches the set value of 20kV. After the voltage of the thermal power generator reaches the set value of 20kV, the magnetization is stopped and the voltage is continuously tested.

[0029] Furthermore, in the one-key start control system for a thermal power unit provided by the present invention, the no-load parameter checking module is further used for:

[0030] After the voltage of the thermal power generator reaches the preset value, the excitation voltage and current of the thermal power generator in the no-load state are detected to see whether they are within the normal range, and the no-load parameter inspection result is obtained. The normal range of the excitation voltage and current of the thermal power generator in the no-load state is voltage <113V and current <1100A.

[0031] Furthermore, in the one-key start control system for a thermal power unit provided by the present invention, the synchronous operation module is also used for:

[0032] Automatic synchronization request module: used to automatically trigger the automatic synchronization button on the DEH disk and issue a synchronization request;

[0033] Introducing the closing power supply module: used to automatically switch on the closing power supply;

[0034] Introducing the synchronous voltage module: used to automatically input the synchronous voltage and activate the automatic synchronous device;

[0035] Start synchronization device module: used to start the automatic synchronization device and wait for the synchronization conditions to be met;

[0036] Closing operation module: used to automatically perform closing operation when the synchronization conditions are met, so that the generator can be connected to the power grid;

[0037] Reset synchronization device module: After closing is completed, the synchronization device is automatically reset and the sequential control is locked to prevent repeated operations.

[0038] Furthermore, in the one-key start control system for a thermal power unit provided by the present invention, the state monitoring module is also used for:

[0039] Monitor the generator status such as voltage, current, speed, operation process, closing power supply, and synchronous voltage input status;

[0040] After monitoring that the generator of the thermal power unit has been closed, unauthorized repeated operations are prohibited by locking the sequential control.

[0041] Furthermore, in the one-key start control system for a thermal power unit provided by the present invention, the state monitoring module is also used for:

[0042] When the generator status such as voltage, current, speed and operation process closing power supply are not consistent with the expected value, the optimization process is started;

[0043] The operation parameters and operation sequence of the one-button start control system are encoded into chromosomes, and a certain number of chromosomes are randomly generated as the initial population;

[0044] Set a fitness function to evaluate the performance of each chromosome, and use methods such as tournament selection to select excellent chromosomes from the current population for genetic operations;

[0045] Randomly select two chromosomes, exchange some genes at a certain crossover point, generate new chromosomes, evaluate each chromosome in the new population, and calculate its fitness until the preset number of iterations is reached or the fitness reaches a certain threshold;

[0046] Analyze the parameter settings of the optimal chromosome and evaluate its actual performance in the one-button start control system of thermal power units.

[0047] The control system parameters are optimized according to the analysis results, and the optimized parameter settings are applied to the one-button start control system of the thermal power unit.

[0048] The beneficial effects of the present invention are mainly reflected in the following aspects:

[0049] The present invention greatly simplifies the originally cumbersome and complicated manual grid connection operation process through the automatic control module. The operator only needs to issue a start command through the background control system, and the system can automatically complete a series of steps such as excitation input, magnetization, and synchronous operation, which significantly improves work efficiency.

[0050] Traditional grid-connected operations take more than 20 minutes, but the present invention can complete the grid-connected operation in a shorter time through automated control, thereby improving the response speed and efficiency of the power system, and being able to restore power supply more quickly, especially in emergency situations.

[0051] Automatic control reduces the number of manual interventions and avoids misoperation caused by human factors. At the same time, the system has built-in multiple detection and verification mechanisms, so that each step of the operation is carried out under the premise of meeting the preset conditions, thereby improving the safety and reliability of the operation.

[0052] Traditional grid-connected operation requires operators to maintain high concentration for a long time and perform multiple steps manually, which is labor-intensive. However, the present invention reduces the burden on operators through automated control, allowing them to focus more on monitoring and management of the overall power system.

[0053] The present invention not only realizes the automation of grid-connected operation, but also enables the system to monitor the status and operation process of the generator in real time through integrated status monitoring and optimization algorithms, and makes intelligent adjustments and optimizations according to actual conditions, thereby improving the overall intelligence level of the system. The modular design of the present invention makes each control module relatively independent, which is convenient for maintenance and upgrading. At the same time, interfaces and expansion space are reserved to facilitate the addition of new functional modules or integration with other systems in the future.

[0054] In summary, the present invention, through the application of automatic control technology, not only simplifies the grid-connected operation process of thermal power units, improves work efficiency and safety, but also reduces the labor intensity of operators, improves the intelligence level of the system, and provides a strong guarantee for the stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0056] Figure 1 A schematic diagram of a one-button start control system for a thermal power unit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0057] 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 in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only 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. The technical solutions provided by the embodiments of the present invention are described in detail below in conjunction with the drawings.

[0058] In order to better understand the purpose of the present invention, the present invention is described in further detail below.

[0059] The excitation input module is responsible for automatically inputting the excitation system, controlling the FMK to automatically close the switch through the DCS system, so that the generator voltage rises to the preset value (such as 95%). At the same time, it detects whether the three-phase current and voltage of the generator stator meet the requirements to ensure that the generator is in a no-load and stable state. As the starter of the startup process, the excitation input module will continue to perform subsequent magnetization and synchronization operations only after confirming that the generator is in a normal state.

[0060] The automatic magnetization module automatically performs magnetization after confirming that the generator stator current is zero and the voltage is balanced until the terminal voltage reaches the set value (such as 20kV). The voltage will be checked regularly during the magnetization process, and the magnetization will be stopped after reaching the set value and stabilized for a period of time. The magnetization operation depends on the successful execution of the excitation input module, and the no-load parameter check module will be triggered after the terminal voltage reaches the preset value.

[0061] The no-load parameter check module verifies whether the excitation voltage and current of the generator under no-load condition are within the normal range (such as voltage <113V, current <1100A) so that the generator is ready for synchronous operation. The no-load parameter check module is executed after the automatic magnetization is completed as the last check before the synchronous operation. After confirmation, the synchronous operation will continue.

[0062] The synchronous operation module includes the following submodules:

[0063] Automatic synchronization request module: automatically click the "automatic synchronization" button on the DEH disk to issue a synchronization request.

[0064] Introducing the closing power supply module: automatically inputting the closing power supply to prepare for the closing operation.

[0065] Introduce the synchronous voltage module: automatically input the synchronous voltage and activate the automatic synchronization device.

[0066] Start synchronization device module: Start the automatic synchronization device and wait for the synchronization conditions to be met.

[0067] Closing operation module: When the synchronization conditions are met, the closing operation is automatically performed to connect the generator to the grid.

[0068] Reset synchronization device module: After closing is completed, the synchronization device is automatically reset and the sequential control is locked to prevent repeated operations.

[0069] The synchronous operation module is responsible for the entire synchronous operation process of the generator being connected to the grid, from requesting synchronization to completing the closing operation, and ensures the accuracy and timeliness of the operation. The synchronous operation module is started after the no-load parameter check passes, and each submodule is executed in sequence until the closing operation is completed.

[0070] The status monitoring module continuously monitors the generator status (such as voltage, current, speed, etc.) and operation progress (such as the state of closing power supply and synchronous voltage) during the entire one-key start process. After closing, the sequence control is locked to prevent unauthorized repeated operations. The status monitoring module interacts with all other modules to ensure timely response and take corresponding protection measures in any abnormal situation.

[0071] The present invention first confirms that the generator is in no-load and stable state through the excitation input module. Subsequently, the automatic magnetization module raises the generator voltage to the set value and performs no-load parameter inspection. After the inspection is passed, the synchronous operation module starts to execute, and completes the automatic synchronization request, introduces the closing power supply, introduces the synchronous voltage, starts the synchronous device, closes the switch and resets the synchronous device in sequence. During the whole process, the state monitoring and locking module continuously monitors the generator state and operation process to ensure the safety and accuracy of the operation. When the closing is completed, the system prevents repeated operations by locking the sequential control to ensure the safe and stable operation of the generator set.

[0072] The main purpose of using genetic algorithms to optimize the one-button start control system of thermal power units is to automatically adjust the parameters and operation steps of the control system through the algorithm to achieve faster startup speed, higher efficiency and lower error rate. The following is a simplified optimization step flow to show how to apply genetic algorithms to optimize the operation of the one-button start control system of thermal power units:

[0073] Define optimization goals, minimize startup time and reduce the total time from the issuance of the startup command to the unit being connected to the grid. Maximize operation accuracy and reduce the occurrence of misoperation. Improve system stability so that system parameters (such as voltage, current, and speed) remain stable during the startup process.

[0074] Encoding and initializing the population, encoding the operating parameters and operation sequence of the one-button start control system into chromosomes. For example, it may include magnetization rate, voltage preset value, detection threshold, etc. A certain number of chromosomes are randomly generated as the initial population.

[0075] Fitness function design,Design a fitness function to evaluate the performance of each chromosome. The fitness function should comprehensively consider the startup time, operation accuracy and system stability. For example, the fitness function can be the inverse of the startup time plus the weighted score of the operation accuracy, while considering whether the voltage and current fluctuations are within the allowable range.

[0076] Selection operation, using methods such as tournament selection to select excellent chromosomes from the current population for genetic operations.

[0077] Crossover and mutation: randomly select two chromosomes, exchange some genes at a certain crossover point, and generate new chromosomes. Randomly change the values ​​of certain genes in the chromosome with a certain probability to increase the diversity of the population.

[0078] Generate a new generation of population, generate a new population through selection, crossover and mutation operations, and replace the old population.

[0079] Evaluation and iteration Evaluate each chromosome in the new population and calculate its fitness until the preset number of iterations is reached or the fitness reaches a certain threshold.

[0080] Result analysis and parameter tuning: Analyze the parameter settings of the optimal chromosome and evaluate its actual performance in the one-key start control system of the thermal power unit. According to the analysis results, the control system parameters are tuned so that the system can achieve the expected performance in actual operation.

[0081] Apply the optimized parameter settings to the actual one-button start control system of the thermal power unit. Continuously monitor system performance, collect feedback data, and make further optimization adjustments as needed.

[0082] DCS system definition: DCS system is a distributed control system based on computer technology. It connects multiple microprocessors through a communication network to achieve centralized monitoring and decentralized control of large industrial equipment. In complex industrial processes such as thermal power units, DCS systems can efficiently manage the operating status of various equipment, optimize control logic, and improve production efficiency and safety.

[0083] The role of the DCS system in the one-button start of thermal power units: In the present invention, the DCS system is used to replace the traditional manual operation to realize the automatic grid connection and start-stop control of the generator set. Through the preset control logic and automatic detection mechanism, the DCS system can automatically perform a series of operations, such as excitation, magnetization, checking no-load parameters, automatic synchronization, and switching on and off circuits, thereby simplifying the operation process, reducing the labor intensity of operators, and reducing the risk of misoperation.

[0084] The automatic closing of the FMK (referring to the identifier of a specific circuit breaker or switch) is a key step in the entire one-button start process, as explained below:

[0085] The meaning of FMK automatic closing: In the one-button start control system of thermal power units, FMK automatic closing means automatically closing FMK (which may refer to the generator output circuit breaker or other key switches) through the control logic of the DCS system to achieve the connection between the generator and the external power grid. This step is one of the key operations before the generator set is connected to the grid.

[0086] FMK automatic closing triggering conditions: FMK automatic closing is usually triggered after a series of preconditions are met, such as zero three-phase current of the generator stator, balanced three-phase voltage of the generator stator, no grounding abnormality of the generator rotor, etc. These conditions are confirmed by the automatic detection mechanism of the DCS system. When a series of preconditions are met and triggered, the DCS system will execute the FMK automatic closing operation.

[0087] Function of FMK automatic closing: FMK automatic closing is an important part of the process of generator set grid connection, which realizes the physical connection between the generator and the grid. Through the closing of FMK, the generator can transmit electricity to the grid to meet the load demand. At the same time, since this operation is automatically completed by the DCS system, it reduces manual intervention and reduces the risk of misoperation.

[0088] Subsequent operations of FMK automatic closing: After FMK automatic closing, the DCS system usually continues to execute subsequent control logic, such as magnetization to increase the generator voltage, check no-load parameters, automatic synchronization, etc., until the generator set is successfully connected to the grid and operates stably.

[0089] The invention provides a one-button start control system for a thermal power unit, aiming to solve the problems of the existing thermal power unit generator being complicated and time-consuming to operate, prone to misoperation, and highly dependent on manual labor. The specific technical solution is as follows:

[0090] The present invention includes a thermal power unit control terminal, a background control terminal and a thermal power unit generator terminal, and a communication connection is established between the three. The thermal power unit control terminal is responsible for the core control function, specifically including the following modules:

[0091] The startup task receiving unit receives the startup task of the thermal power unit controlled by the background. The startup task is parsed to obtain the operation preset value and the startup command of the thermal power unit. The operation preset value includes the generator voltage preset value and the generator current preset value.

[0092] The excitation input module receives the preset value and start-up command of the thermal power unit, and controls the FMK to automatically close through the DCS system, so that the generator voltage rises to the preset value (such as 95%). At the same time, the three-phase current and voltage of the generator stator are detected to ensure that the generator is in a no-load and stable state: the three-phase current of the generator stator should be zero (A, B, C three-phase <10A). The three-phase voltage of the generator stator should be balanced (the difference between any two of AB, BC, CA <0.2kV). Check that there is no grounding abnormality in the generator rotor.

[0093] The automatic magnetization module automatically performs magnetization after confirming that the generator is in normal condition until the generator voltage reaches the set value (such as 20kV). The voltage is regularly tested during the magnetization process, and the magnetization is stopped after reaching the set value, and it remains stable for a period of time.

[0094] The no-load parameter check module detects whether the excitation voltage and current of the generator under no-load state are within the normal range (voltage <113V, current <1100A) after the generator terminal voltage reaches the preset value.

[0095] The synchronous operation module, if the no-load parameter check result is qualified, sends a synchronization request to the relevant module to execute the synchronous operation process of the generator being connected to the power grid, including:

[0096] Automatic synchronization request module: automatically triggers the "automatic synchronization" button on the DEH disk and issues a synchronization request.

[0097] Introducing the closing power supply module: automatically switching on the closing power supply.

[0098] Introduce the synchronous voltage module: automatically input the synchronous voltage and activate the automatic synchronization device.

[0099] Start synchronization device module: Start the automatic synchronization device and wait for the synchronization conditions to be met.

[0100] Closing operation module: When the synchronization conditions are met, the closing operation is automatically performed to connect the generator to the grid.

[0101] Reset synchronization device module: After closing is completed, the synchronization device is automatically reset and the sequential control is locked to prevent repeated operations.

[0102] The status monitoring module continuously monitors the generator status (such as voltage, current, speed) and operation process (such as the power supply and synchronous voltage input status). After the generator is detected to be closed, unauthorized repeated operations are prohibited by locking the sequential control. If the status or process is not as expected, the optimization process is started, and the genetic algorithm is used to adjust the control parameters and optimize the operation.

[0103] The present invention simplifies the originally cumbersome and complicated grid-connected operation process into an automatic completion through several core modules, greatly reducing the difficulty and complexity of operation. Automated operation significantly shortens the grid-connected time and improves the response speed and efficiency of the power system. Through precise automatic detection and control logic, it reduces the misoperation caused by human factors and improves the accuracy of operation. It realizes remote monitoring and automatic control, reduces the dependence on operators, and improves the intelligence level of the system.

[0104] Through the above technical scheme, the present invention effectively solves the problems existing in the prior art such as cumbersome and complicated operation, long time consumption, easy operation errors and strong dependence on manual labor, and improves the operating efficiency and safety of thermal power units.

[0105] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations, and the above-described embodiments of the present invention do not constitute a limitation on the scope of protection of the present invention.

Claims

1. A one-button start control system for a thermal power unit, characterized in that: include: The thermal power unit control end, the background control end and the thermal power unit generator end, the thermal power unit control end establishes a communication connection with the background control end and the thermal power unit generator end, and the thermal power unit control end includes: A startup task receiving unit receives a startup task of a thermal power unit controlled by a background, analyzes the startup task of the thermal power unit, obtains a preset value of operation of the thermal power unit and a startup command of the thermal power unit, wherein the preset value of operation of the thermal power unit includes a preset value of voltage of a generator of the thermal power unit and a preset value of current of a generator of the thermal power unit; The excitation input module receives the preset operation value of the thermal power unit and the start-up command of the thermal power unit, and is used to control the FMK to automatically close the switch through the DCS system, so that the voltage of the thermal power unit generator rises to the preset value, and at the same time detects whether the three-phase current and voltage of the generator stator meet the preset values, confirming that the thermal power unit generator is in normal state; Automatic magnetization module, when the generator of the thermal power unit is in normal state, is used to perform magnetization until the voltage of the generator of the thermal power unit reaches the set value, detect the voltage during the magnetization process, and stop magnetization after reaching the set value; The no-load parameter inspection module checks whether the excitation voltage and current of the generator under no-load condition are within the normal range after the generator terminal voltage reaches the preset value, and obtains the no-load parameter inspection result; The synchronous operation module, if the no-load parameter check result is qualified, sends a synchronization request to the excitation input module, the automatic magnetization module and the no-load parameter check module for the synchronous operation process of the thermal power generator being connected to the power grid until the closing operation is completed; The status monitoring module monitors the status of the thermal power unit generator and the operation process of the thermal power unit generator. The status of the thermal power unit generator includes voltage, current and speed. The operation process of the thermal power unit generator includes the power supply and synchronous voltage input status. After monitoring that the thermal power unit generator is closed, unauthorized repeated operations are prohibited by locking the sequential control.

2. The one-key start control system for a thermal power unit according to claim 1, characterized in that: The excitation input module is also used for: Receive the thermal power unit operation preset value and the thermal power unit start-up command; The DCS system controls the FMK to automatically close, so that the voltage of the thermal power generator increases to 95% of the preset value; At the same time, detect the three-phase current and voltage of the stator of the thermal power unit generator, so that the thermal power unit generator is in no-load and stable state. The three-phase current of the stator of the thermal power unit generator should be zero. The three-phase current of the stator of the thermal power unit generator includes A, B, and C phases, and A, B, and C phases are all <10A; The three-phase voltage of the stator of the thermal power unit generator should be balanced, and the difference between any two of AB, BC and CA should be less than 0.2kV; Detect whether the generator rotor has grounding anomaly and no rotor grounding signal.

3. The one-key start control system for a thermal power unit according to claim 1, characterized in that: The automatic magnetization module is also used for: After confirming that the stator current of the thermal power unit generator is zero and the voltage is balanced, the magnetization operation is performed; During the magnetization process, the voltage is tested regularly until the voltage of the thermal power generator reaches the set value of 20kV. After the voltage of the thermal power generator reaches the set value of 20kV, the magnetization is stopped and the voltage is continuously tested.

4. The one-key start control system for a thermal power unit according to claim 1, characterized in that: The no-load parameter checking module is further used for: After the voltage of the thermal power generator reaches the preset value, the excitation voltage and current of the thermal power generator in the no-load state are detected to see whether they are within the normal range, and the no-load parameter inspection result is obtained. The normal range of the excitation voltage and current of the thermal power generator in the no-load state is voltage <113V and current <1100A.

5. The one-key start control system for a thermal power unit according to claim 1, characterized in that: The synchronous operation module is further used for: Automatic synchronization request module: used to automatically trigger the automatic synchronization button on the DEH disk and issue a synchronization request; Introducing the closing power supply module: used to automatically switch on the closing power supply; Introducing the synchronous voltage module: used to automatically input the synchronous voltage and activate the automatic synchronous device; Start synchronization device module: used to start the automatic synchronization device and wait for the synchronization conditions to be met; Closing operation module: used to automatically perform closing operation when the synchronization conditions are met, so that the generator can be connected to the power grid; Reset synchronization device module: After closing is completed, the synchronization device is automatically reset and the sequential control is locked to prevent repeated operations.

6. The one-key start control system for a thermal power unit according to claim 1, characterized in that: The state monitoring module is also used for: Monitor the generator status such as voltage, current, speed, operation process, closing power supply, and synchronous voltage input status; After monitoring that the generator of the thermal power unit has been closed, unauthorized repeated operations are prohibited by locking the sequential control.

7. The one-key start control system for a thermal power unit according to claim 1, characterized in that: The state monitoring module is also used for: When the generator status such as voltage, current, speed and operation process closing power supply are not consistent with the expected value, the optimization process is started; The operation parameters and operation sequence of the one-button start control system are encoded into chromosomes, and a certain number of chromosomes are randomly generated as the initial population; Set a fitness function to evaluate the performance of each chromosome, and use methods such as tournament selection to select excellent chromosomes from the current population for genetic operations; Randomly select two chromosomes, exchange some genes at a certain crossover point, generate new chromosomes, evaluate each chromosome in the new population, and calculate its fitness until the preset number of iterations is reached or the fitness reaches a certain threshold; Analyze the parameter settings of the optimal chromosome, evaluate its actual performance in the one-button start control system of the thermal power unit, tune the control system parameters according to the analysis results, and apply the optimized parameter settings to the one-button start control system of the thermal power unit.

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