High-pressure diesel engine assisted 6F gas turbine black start method and system

Abstract

The invention discloses a black-start method and system for a 6F gas turbine assisted by a high-pressure diesel generator, and relates to the technical field of black-start of high-pressure gas turbines.The black-start method comprises the steps that parallel operation is conducted on diesel generator sets, and power supply in a plant is recovered; in the starting process of the gas turbine, a static frequency converter (SFC) takes electricity from a 10kV bus through an isolation transformer and a load switch, provides frequency and current control and adjusts the rotating speed of the gas turbine; the diesel generating set is connected with the gas turbine in parallel through anti-synchronization control, and the gas turbine is subjected to black start and enters an isolated island operation mode. According to the method, through parallel operation of the diesel generating sets, the success rate and the response speed of the whole black start process are improved; the undisturbed parallel operation of the diesel generating set and the gas turbine is realized through the anti-synchronization control, the overall reliability and the starting success rate of the system are improved, the power failure caused by unstable parallel connection is reduced, and the black-start efficiency of the whole power system is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure gas turbine black start, and in particular to a high-pressure diesel-assisted 6F gas turbine black start method and system. Background Art

[0002] With the rapid development of the power system and the increasing proportion of new energy access, the stability and security of the power grid are facing huge challenges. Especially in the context of the increasing proportion of large-scale new energy power generation, the power supply stability of the power grid is becoming increasingly difficult to guarantee. In this process, gas turbines have gradually become an important power source for black start of the power grid due to their advantages such as fast starting speed and high power density. However, the existing gas turbine black start system mostly relies on the power supply provided by the static frequency converter (SFC) to achieve starting. The application of this technology provides relatively stable current and frequency control for gas turbine starting, ensuring that the gas turbine can start smoothly and quickly carry load. At the same time, diesel generator sets, as a stable and reliable emergency power supply, provide important guarantees for black start at critical moments of the power grid. Despite this, there is currently no relatively mature technical solution for the black start system of high-pressure gas turbines combined with the auxiliary start of diesel generator sets, resulting in a long black start time and a low success rate in extreme cases.

[0003] The shortcomings of the current gas turbine black start system are mainly reflected in the following aspects. First, the existing gas turbine black start scheme usually relies only on the static frequency converter (SFC) to provide power for the gas turbine, but the starting capacity of the SFC is limited. Especially in the process of starting a high-voltage and high-power gas turbine, there may be problems such as insufficient starting current or long starting time, resulting in black start failure. Secondly, during the black start of the gas turbine, there are challenges in the frequency and voltage control of the gas turbine generator in the island operation, especially under the condition of small load of the isolated grid, the system frequency fluctuates greatly, and it is difficult to achieve stable operation. The existing technology lacks effective means of coordinating the control of frequency and voltage in the island operation mode. Thirdly, most of the existing gas turbine black start technologies do not consider the coordinated operation with the diesel generator set, and the diesel generator set can provide important power support as an auxiliary starting power supply. However, its anti-synchronous control strategy during parallel operation is not yet mature, which is easy to cause voltage and frequency fluctuations and grid instability. In addition, the existing technology usually cannot achieve disturbance-free switching of multiple power supply points during black start, and the power recovery process in the plant is easily affected, which in turn affects the black start process of the entire power grid. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problems solved by the present invention are: the existing gas turbine black start method has insufficient starting current, the frequency and voltage are difficult to control during island operation, and it is impossible to operate in parallel with the diesel generator set, as well as how to achieve disturbance-free switching and stable operation of the diesel generator set and the gas turbine.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a black start method for a high-voltage diesel-assisted 6F gas turbine, comprising: operating the diesel generator set in parallel to restore power supply within the plant; during the start-up of the gas turbine, the static frequency converter SFC draws power from the 10kV bus through the isolation transformer and the load switch, provides frequency and current control, and adjusts the speed of the gas turbine; the diesel generator set is connected in parallel with the gas turbine through anti-synchronous control, the gas turbine is black started, and enters the island operation mode.

[0007] As a preferred scheme of the black start method of the high-voltage diesel generator assisted 6F gas turbine described in the present invention, the parallel operation includes two 10kV high-voltage diesel generator sets connected to the 10kV diesel generator bus through the first circuit breaker and the second circuit breaker to perform parallel operation of the diesel generator sets.

[0008] As a preferred scheme of the high-voltage diesel-generator assisted 6F gas turbine black start method described in the present invention, the power supply restoration includes connecting the diesel-generator 10kV bus to the 10kV working II section bus for plant power through the first switch and the second switch to restore the power supply of the bus section, and the diesel generator set restores power for the plant power as the power supply path for the subsequent gas turbine black start; the 10kV working section II and the 10kV working section I are interconnected through the connecting switch, and the diesel generator set restores power supply to the 10kV working section I.

[0009] As a preferred solution of the black start method of the high-voltage diesel-assisted 6F gas turbine described in the present invention, the control of providing frequency and current includes that the gas turbine starts relying on a static frequency converter SFC, and draws power from the 10kV working section I through an isolation transformer and a load switch. The SFC device controls the current and frequency through rectification and inversion, converts the 10kV AC power into AC power with a frequency range of 0-45Hz, and controls the starting speed and power factor of the gas turbine; the SFC outputs alternating current to supply power to the stator winding of the gas turbine generator through the isolation switch. During the startup phase of the gas turbine, the SFC is responsible for providing excitation current to the stator of the gas turbine, and the third switch is in the disconnected state.

[0010] As a preferred solution of the black start method of the high-voltage diesel-assisted 6F gas turbine described in the present invention, wherein: the adjustment of the speed of the gas turbine includes during the startup of the gas turbine, the excitation device takes power through the excitation transformer and the load switch, and after rectification, the DC switch MGK provides excitation current for the gas turbine rotor. Under the control of SFC, the speed of the gas turbine is gradually increased. When it reaches 90% of the rated speed, SFC gradually exits, the gas turbine maintains a self-sustaining speed by burning natural gas, and the gas turbine generator enters a no-load operation state.

[0011] As a preferred scheme of the black start method of the high-voltage diesel generator assisted 6F gas turbine described in the present invention, wherein: the parallel connection of the diesel generator set and the gas turbine includes that when the gas turbine reaches a self-sustaining speed, the diesel generator set and the gas turbine are operated in parallel through the reverse synchronization function. The system controls the fourth switch to achieve reverse synchronous parallel connection of the gas turbine and the diesel generator. The diesel generator set is in the speed regulation mode VF, operates with the factory power load, and adjusts the frequency and voltage of the 10kV bus section.

[0012] As a preferred scheme of the black start method of a high-voltage diesel-generator assisted 6F gas turbine described in the present invention, wherein: the island operation mode includes that after the gas turbine is connected in parallel with the diesel generator, the control mode of the diesel generator unit is switched from the speed regulation mode VF to the power mode PQ, and the initial load of 3% of the rated power is maintained, and the gas turbine operates in the island mode with its own plant power to complete the black start, and the diesel generator unit operates in parallel with the gas turbine in the power mode; when the gas turbine island stops running, the DCS system issues a trip command, and after the fourth switch is tripped, the diesel generator unit immediately switches back to the speed regulation mode VF, the plant power load is taken over by the diesel generator unit, and the gas turbine is safely shut down according to the sequential control process.

[0013] Another object of the present invention is to provide a high-voltage diesel-assisted 6F gas turbine black start system, which can provide frequency and current control and adjust the speed of the gas turbine by drawing power from the 10kV bus through the isolation transformer and the load switch during the gas turbine startup process, thereby solving the problem of low stability of the current high-voltage gas turbine black start technology.

[0014] As a preferred solution of the high-voltage diesel-assisted 6F gas turbine black start system described in the present invention, it includes: a parallel operation module, a black start control module, and an operation switching module; the parallel operation module is used to parallel operate the diesel generator set to restore power supply within the factory; the black start control module is used to, during the start-up process of the gas turbine, the static frequency converter SFC draws power from the 10kV bus through the isolation transformer and the load switch, provides frequency and current control, and adjusts the speed of the gas turbine; the operation switching module is used to connect the diesel generator set and the gas turbine in parallel through anti-synchronous control, and the gas turbine performs a black start and enters the island operation mode.

[0015] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement a step of a black start method of a 6F gas engine assisted by a high-voltage diesel generator.

[0016] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a black start method for a 6F combustion engine assisted by a high-voltage diesel generator.

[0017] Beneficial effects of the present invention: The high-voltage diesel-assisted 6F gas turbine black start method provided by the present invention effectively solves the problem of insufficient power supply before the black start of the gas turbine through the parallel operation of the diesel generator set, ensures stable and reliable power supply in the factory before the gas turbine is started, and improves the success rate and response speed of the entire black start process; through the frequency and current control of the SFC, the smooth acceleration and safe start of the gas turbine are achieved, and the start-up risks caused by current fluctuations or frequency instability are avoided. This control process improves the starting efficiency and success rate of the gas turbine, and provides important technical support for the self-sustaining operation of the gas turbine during the black start process. Through the reverse synchronization control, the undisturbed parallel operation of the diesel generator set and the gas turbine is achieved, which ensures that the gas turbine can smoothly enter the island operation mode during the black start process. The diesel generator set continues to output stably in the power mode, which improves the overall reliability and start-up success rate of the system, reduces power failures caused by parallel instability, and thus improves the black start efficiency of the entire power system. The present invention achieves better results in terms of stability, reliability and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 An overall flow chart of a black start method for a high-pressure diesel-assisted 6F gas turbine provided in the first embodiment of the present invention.

[0020] Figure 2 A high-pressure diesel-assisted 6F gas engine black start system structure diagram of a high-pressure diesel-assisted 6F gas engine black start method provided in the first embodiment of the present invention.

[0021] Figure 3 A black start system control system diagram of a high-pressure diesel-assisted 6F gas turbine black start method provided in the first embodiment of the present invention.

[0022] Figure 4An overall flow chart of a high-pressure diesel-assisted 6F gas turbine black start system provided for the third embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0024] Example 1, reference Figure 1-Figure 3 , which is an embodiment of the present invention, provides a black start method for a high-voltage diesel-assisted 6F gas turbine, comprising: S1: Run the diesel generator sets in parallel to restore power supply within the factory.

[0025] Furthermore, Figure 2 It is represented as a structural diagram of a high-voltage diesel generator assisted 6F gas turbine black start system. The parallel operation includes two 10kV high-voltage diesel generator sets connected to the 10kV diesel generator bus through the first circuit breaker 9001 and the second circuit breaker 9002 to perform parallel operation of the diesel generator sets.

[0026] It should be noted that power supply restoration includes connecting the 10kV diesel generator bus to the 10kV working section II bus for plant power through the first switch 9004 and the second switch 9006 to restore the power supply of the bus section, and the diesel generator set restores power supply for plant power, which serves as the power supply path for the subsequent black start of the gas turbine; the 10kV working section II and the 10kV working section I are interconnected through the connecting switch 9100, and the diesel generator set restores power supply to the 10kV working section I.

[0027] It should also be noted that the power supply of the 10kV working section II busbar for the factory power supply is quickly restored through the parallel operation of the diesel generator sets, and the power supply of the 10kV working section I busbar is further restored through the interconnecting switch 9100. This process ensures the restoration of basic power supply in the factory and provides the necessary power path for the black start of the gas turbine. This step ensures that the power infrastructure in the factory can regain power supply in a short time during the black start process, preventing the equipment from being unable to operate due to power outages in the entire factory. At the same time, the diesel generator set, as an emergency backup power supply, has high stability and reliability, and can ensure the effectiveness of factory power restoration in extreme environments.

[0028] S2: During the start-up of the gas turbine, the static frequency converter SFC draws power from the 10kV bus through the isolation transformer and load switch, provides frequency and current control, and adjusts the speed of the gas turbine.

[0029] Furthermore, the frequency and current control provided includes that the gas turbine startup relies on the static frequency converter SFC, which draws power from the 10kV working section I through the isolation transformer and load switch 9108. The SFC device controls the current and frequency through rectification and inversion, converts the 10kV AC power into AC power with a frequency range of 0-45Hz, and controls the starting speed and power factor of the gas turbine; the SFC outputs the alternating current to supply power to the stator winding of the gas turbine generator through the isolation switch 89SS. During the startup phase of the gas turbine, the SFC is responsible for providing excitation current to the stator of the gas turbine, and the third switch 52G is in the disconnected state.

[0030] It should be noted that the speed adjustment of the gas turbine includes the process of starting the gas turbine. The excitation device takes power through the excitation transformer and the load switch 9106, and after rectification, the DC switch MGK provides excitation current for the gas turbine rotor. Under the control of SFC, the speed of the gas turbine gradually increases. When it reaches 90% of the rated speed, SFC gradually exits, the gas turbine maintains a self-sustaining speed by burning natural gas, and the gas turbine generator enters a no-load operation state.

[0031] It should also be noted that in the initial stage of gas turbine startup, SFC first uses precise current control and the AC-DC rectifier module to adjust the current amplitude to ensure stable output power. Subsequently, the inverter module is responsible for converting DC power back into 0-45Hz adjustable frequency AC power. SFC adjusts the output frequency in real time based on the gas turbine speed feedback signal, gradually increases the turbine speed, and prevents excessive current or frequency fluctuations. During the turbine startup process, SFC dynamically adjusts the output power factor to ensure that the system maintains voltage stability at different speeds and avoids system instability caused by power factor mismatch.

[0032] It should also be noted that during the startup phase of the gas turbine, the SFC supplies power to the gas turbine stator winding through the 89SS isolating switch. In order to prevent possible short circuits, the system sets up an electrical locking mechanism to ensure that the 52G switch remains disconnected during SFC power supply. At the same time, the SFC system has a built-in short-circuit detection module to monitor the voltage and current values ​​on the output side in real time. If abnormal current fluctuations are detected, the system immediately issues an alarm and triggers circuit breaker protection to avoid short circuits. In addition, the isolation transformer plays a role of electrical isolation in the entire process, further reducing the risk of short circuits.

[0033] It should also be noted that when the gas turbine is started, the excitation device draws power from the 10kV working section I, and after rectification, it provides excitation current to the gas turbine rotor through the DC switch MGK. During this process, the excitation device dynamically adjusts the excitation current according to the speed sensor signal of the gas turbine and the current feedback of the stator winding. Through the PID control algorithm, the excitation device can ensure that the optimal excitation current is maintained at different speed stages, ensuring the smooth acceleration of the gas turbine and the stability of the final speed. In addition, during the startup phase, the excitation device can automatically adapt to different load conditions according to the current reference signal Idref of the SFC, gradually increase the excitation current, and avoid current shocks.

[0034] It should also be noted that through the frequency and current control of SFC, the gas turbine can gradually increase the speed during the startup process. After reaching 90% of the rated speed, SFC gradually exits and the gas turbine enters the self-sustaining speed stage. At the same time, SFC provides excitation current to the stator of the gas turbine to ensure the stability of the current during the startup of the gas turbine and prevent startup failure due to unstable current. The role of this step is to provide the gas turbine with the precise current and frequency control required for startup, so that its speed can be gradually increased according to the predetermined control strategy, while ensuring the safety and stability of the electrical system. The role of SFC is not only to provide power, but also to ensure that the gas turbine can accelerate stably at each stage by adjusting the frequency and current, and finally reach normal working state.

[0035] S3: The diesel generator set is connected in parallel with the gas turbine through anti-synchronous control, and the gas turbine is black-started to enter the island operation mode.

[0036] Furthermore, the diesel generator set and the gas turbine are connected in parallel, including when the gas turbine reaches a self-sustaining speed, the diesel generator set and the gas turbine are operated in parallel through the anti-synchronous function. The system controls the fourth switch 9101 to achieve anti-synchronous parallel connection between the gas turbine and the diesel generator. The diesel generator set is in speed regulation mode VF, operates with factory power load, and adjusts the frequency and voltage of the 10kV bus section.

[0037] It should be noted that the island operation mode includes that after the gas turbine is connected in parallel with the diesel generator, the diesel generator unit control mode is switched from the speed control mode VF to the power mode PQ, and the initial load of 3% of the rated power is maintained. The gas turbine operates in the island mode with its own power supply to complete the black start. Figure 3 It represents the control system diagram of the black start system. The diesel generator set runs in parallel with the gas turbine in power mode. When the gas turbine island stops running, the DCS system issues a trip command. After the fourth switch 9101 is tripped, the diesel generator set immediately switches back to the speed-reducing mode VF. The plant power load is taken over by the diesel generator set, and the gas turbine is safely shut down according to the sequential control process.

[0038] It should also be noted that after the gas turbine reaches 90% of the rated speed and completes the SFC trip, the gas turbine will automatically switch to burning natural gas to maintain a self-sustaining operation state. At this time, the fuel supply system of the gas turbine adjusts the supply of natural gas in real time through the controller to ensure that the gas turbine can maintain a stable speed without the help of SFC. In the process of gradually stabilizing the speed, the gas turbine control system will gradually transition the load from static to dynamic state to ensure that the speed and power output of the gas turbine remain stable under different load conditions. The gas turbine controller automatically adjusts the fuel injection rate through the speed and power feedback signals to prevent the speed of the gas turbine from fluctuating too much when the load increases.

[0039] It should also be noted that when the gas turbine and diesel generator are running in parallel, the diesel generator set will switch from speed control mode (VF) to power mode (PQ) when the system meets specific voltage and frequency conditions. Specifically, when the system detects that the voltage fluctuation of the gas turbine generator is within ±1% and the frequency fluctuation is within ±0.1Hz, the diesel generator control system will automatically switch to power mode. In this mode, the diesel generator set will assume a fixed power output (3% of rated power) to smoothly share the factory power load. During the entire load transfer process, the diesel generator and gas turbine controllers monitor the bus voltage and frequency in real time to ensure the stability of the system during load transfer and avoid disturbances in the electrical system caused by excessive voltage or frequency fluctuations.

[0040] It should also be noted that through anti-synchronous control, the disturbance-free parallel connection of diesel generator sets and gas turbines was successfully achieved, so that the gas turbine entered the island operation mode. During the parallel operation, the diesel generator set switched from the speed control mode (VF) to the power mode (PQ) and maintained the initial load operation, ensuring the power stability of the gas turbine island operation. Anti-synchronous control ensures that after the gas turbine reaches the self-sustaining speed, the diesel generator set can be seamlessly paralleled with it, avoiding the voltage fluctuations and frequency instability problems that may occur in traditional parallel control. The realization of this function not only ensures the stability of the power grid in the island mode, but also provides a solid foundation for the subsequent recovery of the power grid.

[0041] Example 2 is an embodiment of the present invention, which provides a black start method for a 6F gas turbine assisted by a high-pressure diesel engine. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0042] First, this embodiment simulates the black start process of a high-voltage diesel generator set assisting a 6F gas turbine through an experiment to verify its stability and feasibility under extreme environments. The experiment first introduces two 10kV high-voltage diesel generator sets (#1 and #2) in parallel operation in the experimental power grid. The two diesel generator sets are connected to the 10kV diesel generator bus through circuit breakers 9001 and 9002 for parallel operation to ensure power supply recovery. Through switches 9004 and 9006, the diesel generator bus transmits electric energy to the 10kV working section II bus for plant power, forming a preliminary path for power supply recovery. At the same time, the experimental design takes into account the power supply demand under extreme conditions. The 10kV working section II and the 10kV working section I are interconnected through the tie switch 9100, which ensures the breadth and stability of power supply recovery and provides reliable power supply support for the subsequent black start of the gas turbine.

[0043] During the start-up of the gas turbine, the static frequency converter (SFC) draws power from the 10kV bus through the isolation transformer and the 9108 load switch, providing accurate frequency and current control. The SFC achieves precise control of the gas turbine speed by rectifying the 10kV AC into DC and then inverting it into 0-45Hz adjustable AC. The experiment sets different speed stages and monitors the current and frequency output by the SFC in real time to ensure that no current shock and electrical fluctuation occur during the start-up of the gas turbine. When the rated speed reaches 90%, the SFC gradually exits operation, and the gas turbine maintains its speed by burning natural gas, and finally enters the no-load operation state.

[0044] After the gas turbine is started and reaches a stable speed, the diesel generator set and the gas turbine are operated in parallel through anti-synchronous control. Under anti-synchronous control, the 9101 switch realizes seamless parallel connection of the two power supplies to ensure the stability of frequency and voltage during the switching process. At this time, the operation mode of the diesel generator set is switched from speed regulation mode (VF) to power mode (PQ), and the initial power is set to 3% of the rated power to ensure stable power supply when the gas turbine is operating in island mode. The experiment also simulates the stop operation of the gas turbine island mode through the DCS system. After receiving the stop signal, the diesel generator set automatically switches back to speed regulation mode (VF) to ensure seamless takeover of the plant power load.

[0045] Example 3, reference Figure 4 , which is an embodiment of the present invention, provides a high-voltage diesel-assisted 6F gas turbine black start system, including a parallel operation module, a black start control module, and an operation switching module.

[0046] The parallel operation module is used to parallel operate the diesel generator sets and restore power supply within the plant; the black start control module is used during the startup of the gas turbine, and the static frequency converter SFC draws power from the 10kV bus through the isolation transformer and the load switch to provide frequency and current control and adjust the speed of the gas turbine; the operation switching module is used to connect the diesel generator set and the gas turbine in parallel through anti-synchronous control, and the gas turbine performs a black start and enters the island operation mode.

[0047] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), disk or optical disk, etc. Various media that can store program codes.

[0048] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0049] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk case (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0050] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logical function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limited. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

[0051] 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 preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A black start method for a high-voltage diesel-assisted 6F gas turbine, characterized in that: include: Put the diesel generator sets into parallel operation to restore power supply within the factory; During the gas turbine startup process, the static frequency converter SFC draws power from the 10kV bus through the isolation transformer and load switch to provide frequency and current control and adjust the speed of the gas turbine; The diesel generator set is connected in parallel with the gas turbine through anti-synchronous control, and the gas turbine is black-started and enters the island operation mode.

2. The black start method of a high-voltage diesel-assisted 6F combustion engine according to claim 1, characterized in that: The parallel operation includes two 10kV high-voltage diesel generator sets connected to a 10kV diesel generator busbar via a first circuit breaker (9001) and a second circuit breaker (9002) to perform parallel operation of the diesel generator sets.

3. The black start method of a high-voltage diesel-assisted 6F combustion engine as claimed in claim 2, characterized in that: The power supply restoration includes connecting the diesel generator 10kV busbar to the 10kV working section II busbar for the plant power supply through the first switch (9004) and the second switch (9006), restoring the power supply of the busbar section, and the diesel generator set restoring the power supply for the plant power supply as the power supply path for the subsequent black start of the gas turbine; The 10kV working section II is interconnected with the 10kV working section I through a contact switch (9100) to restore the power supply of the diesel generator set to the 10kV working section I.

4. The black start method of a high-voltage diesel-assisted 6F combustion engine as claimed in claim 3, characterized in that: The control of providing frequency and current includes that the gas turbine starts up by relying on a static frequency converter SFC, which takes power from the 10kV working section I through an isolation transformer and a load switch (9108), and the SFC device controls the current and frequency through rectification and inversion, converts the 10kV AC into AC with a frequency range of 0-45Hz, and controls the starting speed and power factor of the gas turbine; The SFC outputs alternating current to supply power to the stator winding of the gas turbine generator through the isolating switch (89SS). During the start-up phase of the gas turbine, the SFC is responsible for providing excitation current to the gas turbine stator, and the third switch (52G) is in the disconnected state.

5. The black start method of a high-voltage diesel-assisted 6F combustion engine as claimed in claim 4, characterized in that: The adjustment of the speed of the gas turbine includes that during the start-up process of the gas turbine, the excitation device obtains power through the excitation transformer and the load switch (9106), and after rectification, the excitation current is provided to the gas turbine rotor through the DC switch MGK. Under the control of the SFC, the speed of the gas turbine is gradually increased. When it reaches 90% of the rated speed, the SFC is gradually withdrawn, the gas turbine maintains a self-sustaining speed by burning natural gas, and the gas turbine generator enters a no-load operation state.

6. The black start method of a high-voltage diesel-assisted 6F combustion engine as claimed in claim 5, characterized in that: The parallel connection of the diesel generator set and the gas turbine includes that when the gas turbine reaches a self-sustaining speed, the diesel generator set and the gas turbine are operated in parallel through the anti-synchronous function. The system controls the fourth switch (9101) to achieve anti-synchronous parallel connection of the gas turbine and the diesel generator. The diesel generator set is in the speed regulation mode VF, operates with the factory power load, and adjusts the frequency and voltage of the 10kV bus section.

7. The black start method of a high-voltage diesel-assisted 6F combustion engine according to claim 6, characterized in that: The island operation mode includes that after the gas turbine is connected in parallel with the diesel generator, the control mode of the diesel generator set is switched from the speed control mode VF to the power mode PQ, and the initial load of 3% of the rated power is maintained, the gas turbine operates in the island mode with its own power supply, the black start is completed, and the diesel generator set operates in parallel with the gas turbine in the power mode; When the gas turbine island stops running, the DCS system issues a trip command. After the fourth switch (9101) is tripped, the diesel generator unit immediately switches back to the speed-reducing mode VF, the plant power load is taken over by the diesel generator unit, and the gas turbine is safely shut down according to the sequential control process.

8. A system using the black start method of a high-voltage diesel-assisted 6F gas turbine as claimed in any one of claims 1 to 7, characterized in that: Including parallel operation module, black start control module, operation switching module; The parallel operation module is used to parallel operate the diesel generator sets to restore power supply within the factory; The black start control module is used to control the frequency and current and adjust the speed of the gas turbine during the startup of the gas turbine. The static frequency converter SFC takes power from the 10kV bus through the isolation transformer and the load switch. The operation switching module is used to connect the diesel generator set in parallel with the gas turbine through anti-synchronous control, and the gas turbine performs a black start and enters an island operation mode.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the black start method of a high-voltage diesel-assisted 6F gas engine according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the black start method of a high-voltage diesel-assisted 6F combustion engine according to any one of claims 1 to 7 are implemented.

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