Starting method and device of micro gas turbine, storage medium and electronic device

Abstract

The invention provides a starting method and device of a micro gas turbine, a storage medium and an electronic device.The method comprises the steps that a starting signal of the micro gas turbine is responded, a starting generator is started and enters a first starting stage, and in the first starting stage, the rotating speed of the starting generator is controlled to rise through open loop, the starting generator is connected with the micro gas turbine through a coupling; in the first starting stage, collecting a first bus voltage and a first phase current of the generator in real time; based on the first bus voltage and the first phase current, controlling the starting generator to switch from the first starting stage to a second starting stage; and in the second starting stage, the rotating speed of the generator is continuously increased through closed-loop control to reach the ignition rotating speed of the micro gas turbine. According to the embodiment, the technical problem that in the prior art, starting of the micro gas turbine is controlled through a position sensor, and the occupied space is large is solved, and the cost and the size of a power generation system are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of micro gas turbine, in particular to a starting method and device of micro gas turbine, storage medium and electronic device. BACKGROUND

[0002] In the related art, the hybrid vehicle equipped with the micro gas turbine power generation system has long pure electric endurance and emergency power supply capacity, and has good performance in urban commuting and long-distance self-driving. The key technology of such hybrid vehicles is to use the micro gas turbine to generate electricity.

[0003] In the related art, before the micro gas turbine generates electricity, the micro gas turbine needs to be dragged to the ignition speed by the generator to complete the start. The existing micro gas turbine starting technology controls the motor operation based on the motor position and speed signals transmitted by the position sensor. Because the position sensor needs to be installed, the system cost and volume increase, and the reliability of the power generation system of the vehicle is reduced in extreme environments such as high temperature.

[0004] In view of the above problems in the related art, there is no efficient and accurate solution. SUMMARY

[0005] The present application provides a starting method and device of micro gas turbine, storage medium and electronic device to solve the technical problems in the related art.

[0006] According to an embodiment of the present application, a starting method of a micro gas turbine is provided, comprising: in response to a starting signal of the micro gas turbine, starting a starter generator and entering a first starting stage, in the first starting stage, the speed of the starter generator is increased through open-loop control, wherein the starter generator is connected with the micro gas turbine through a shaft coupling; in the first starting stage, the first bus voltage and the first phase current of the starter generator are collected in real time; the starter generator is switched from the first starting stage to a second starting stage based on the first bus voltage and the first phase current; in the second starting stage, the speed of the starter generator continues to rise through closed-loop control to reach the ignition speed of the micro gas turbine.

[0007] Optionally, the rising of the rotational speed of the starter generator by open-loop control comprises: reading a set position angle in real time in an open-loop control parameter of the starter generator in an open-loop control process, wherein the set position angle increases from zero; determining a constant current amplitude and an initial frequency corresponding to the set position angle, wherein the initial frequency increases from zero following the set position angle; dynamically generating a rotating current vector based on the constant amplitude and the initial frequency, wherein an electromagnetic torque of the rotating current vector is greater than a maximum load torque of the micro gas turbine; and applying the rotating current vector to the starter generator to accelerate a rotational speed of a rotor of the starter generator from static.

[0008] Optionally, the dynamically generating of the rotating current vector based on the constant amplitude and the initial frequency comprises: collecting three-phase currents of the starter generator in real time; performing Clark transformation on the three-phase currents to obtain component currents in a two-phase static coordinate system; calculating a current position angle of the starter generator by using the component currents and estimating a counter electromotive force position angle by using the component currents; converting the counter electromotive force position angle into a rotor position angle; configuring an actual current frequency of the initial frequency in a current control period according to the current position angle and the rotor position angle, and generating a rotating current vector based on the actual current frequency and the constant amplitude.

[0009] Optionally, the configuring of the actual current frequency of the initial frequency in the current control period according to the current position angle and the rotor position angle comprises: calculating a deviation angle between the current position angle and the rotor position angle; judging whether the deviation angle is greater than a safety threshold; if the deviation angle is greater than the safety threshold, reducing the initial frequency in the current control period to obtain a first actual current frequency; and if the deviation angle is less than or equal to the safety threshold, maintaining the initial frequency in the current control period to obtain a second actual current frequency.

[0010] Optionally, the switching of the starter generator from the first starting stage to the second starting stage based on the first bus voltage and the first phase current comprises: converting the first bus voltage and the first phase current into a first intermediate voltage and a first intermediate current in a static rectangular coordinate axis, respectively; judging whether the starter generator meets a preset state according to the first intermediate voltage and the first intermediate current; and if the starter generator meets the preset state, controlling the starter generator to switch from the first starting stage to the second starting stage.

[0011] Optionally, determining whether the starter generator meets the preset state according to the first intermediate voltage and the first intermediate current comprises: inputting the first intermediate voltage and the first intermediate current into a pre-constructed sliding mode observer, and outputting a first back electromotive force estimation value of a current open-loop control period; performing low-pass filtering and angle compensation on the first back electromotive force estimation value to obtain a first real-time rotor position estimation value of the starter generator in the current open-loop control period; performing differential calculation on the first real-time rotor position estimation value and a first historical rotor position estimation value to obtain a first speed estimation value of the current open-loop control period; determining whether the first back electromotive force estimation value is greater than a first threshold value, and determining whether the first speed estimation value is greater than a second threshold value; and if the first back electromotive force estimation value is greater than the first threshold value and the first speed estimation value is greater than the second threshold value in a plurality of continuous open-loop control periods, determining that the starter generator meets the preset state.

[0012] Optionally, controlling the starter generator to switch from the first starting stage to a second starting stage comprises: determining a switching duration between the first starting stage and the second starting stage; configuring a dynamic weight coefficient in the switching duration, wherein the dynamic weight coefficient is a ramp from 0 to 1; determining a set position angle of the starter generator in open-loop control after meeting the preset state , and calculating a speed estimation value according to the intermediate voltage and the intermediate current ; calculating a hybrid position angle of the starter generator in the switching duration by using the following formula , and replacing the set position angle with the hybrid position angle to perform open-loop control on the starter generator: , wherein, is the dynamic weight coefficient; and after the switching duration ends, determining that the starter generator enters the second starting stage.

[0013] Optionally, the continuously increasing the rotating speed of the starter generator to the ignition rotating speed of the micro gas turbine by closed-loop control comprises: collecting the second bus voltage and the second phase current of the starter generator in the second starting stage in real time; converting the second bus voltage and the second phase current into a second intermediate voltage and a second intermediate current in a stationary rectangular coordinate axis, respectively; inputting the second intermediate voltage and the second intermediate current into a pre-constructed sliding film observer to output a second back electromotive force estimation value in a current closed-loop control period; performing low-pass filtering and angle compensation on the second back electromotive force estimation value to obtain a second real-time rotor position estimation value of the starter generator in the current closed-loop control period; performing differential calculation on the second real-time rotor position estimation value and a second historical rotor position estimation value to obtain a second rotating speed estimation value in the current closed-loop control period; and taking the second real-time rotor position estimation value and the second rotating speed estimation value as closed-loop feedback parameters to control the rotating speed of the starter generator to continuously increase to the ignition rotating speed of the micro gas turbine.

[0014] According to another embodiment of the present application, a starting device of a micro gas turbine is provided, comprising: a first control module configured to start a starter generator and enter a first starting stage in response to a starting signal of the micro gas turbine, and to continuously increase the rotating speed of the starter generator by open-loop control in the first starting stage, wherein the starter generator is connected to the micro gas turbine through a shaft coupling; a collection module configured to collect a first bus voltage and a first phase current of the starter generator in real time in the first starting stage; a switching module configured to control the starter generator to switch from the first starting stage to a second starting stage based on the first bus voltage and the first phase current; and a second control module configured to continuously increase the rotating speed of the starter generator to an ignition rotating speed of the micro gas turbine by closed-loop control in the second starting stage.

[0015] Optionally, the first control module comprises: a reading unit configured to read a set position angle in an open-loop control process in real time from open-loop control parameters of the starter generator, wherein the set position angle increases from zero; a determination unit configured to determine a constant current amplitude and an initial frequency corresponding to the set position angle, wherein the initial frequency increases from zero following the set position angle; a generation unit configured to dynamically generate a rotating current vector based on the constant amplitude and the initial frequency, wherein an electromagnetic torque of the rotating current vector is greater than a maximum load torque of the micro gas turbine; and an acceleration unit configured to apply the rotating current vector to the starter generator to accelerate the rotating speed of a rotor of the starter generator from zero.

[0016] Optionally, the generating unit comprises: a collecting subunit, configured to collect three-phase currents of the starting generator in real time; a transforming subunit, configured to perform Clark transformation on the three-phase currents to obtain component currents in a two-phase static coordinate system; a calculating subunit, configured to calculate a current position angle of the starting generator by using the component currents and estimate a counter electromotive force position angle by using the component currents; a converting subunit, configured to convert the counter electromotive force position angle into a rotor position angle; and a configuring subunit, configured to configure an actual current frequency of the initial frequency in a current control period according to the current position angle and the rotor position angle, and generate a rotating current vector based on the actual current frequency and the constant amplitude.

[0017] Optionally, the configuring subunit is further configured to: calculate a deviation angle between the current position angle and the rotor position angle; determine whether the deviation angle is greater than a safety threshold; if the deviation angle is greater than the safety threshold, reduce the initial frequency in the current control period to obtain a first actual current frequency; and if the deviation angle is less than or equal to the safety threshold, maintain the initial frequency in the current control period to obtain a second actual current frequency.

[0018] Optionally, the switching module comprises: a converting unit, configured to convert the first bus voltage and the first phase current into a first intermediate voltage and a first intermediate current in a static rectangular coordinate axis, respectively; a judging unit, configured to determine whether the starting generator meets a preset state according to the first intermediate voltage and the first intermediate current; and a control unit, configured to control the starting generator to switch from the first starting stage to a second starting stage if the starting generator meets the preset state.

[0019] Optionally, the judging unit comprises: a processing subunit, configured to input the first intermediate voltage and the first intermediate current into a pre-constructed sliding film observer to output a first counter electromotive force estimation value in a current open-loop control period; a compensating subunit, configured to perform low-pass filtering and angle compensation on the first counter electromotive force estimation value to obtain a first real-time rotor position estimation value of the starting generator in the current open-loop control period; a calculating subunit, configured to perform differential calculation on the first real-time rotor position estimation value and a first historical rotor position estimation value to obtain a first speed estimation value in the current open-loop control period; a judging subunit, configured to determine whether the first counter electromotive force estimation value is greater than a first threshold and whether the first speed estimation value is greater than a second threshold; and a determining subunit, configured to determine that the starting generator meets the preset state if, in a plurality of continuous open-loop control periods, the first counter electromotive force estimation value is greater than the first threshold and the first speed estimation value is greater than the second threshold.

[0020] Optionally, the control unit comprises: a determination subunit configured to determine a switching duration between the first starting stage and the second starting stage; a configuration subunit configured to configure a dynamic weight coefficient within the switching duration, wherein the dynamic weight coefficient is a ramp from 0 to 1; and a processing subunit configured to determine a set position angle of open-loop control of the starter generator after a preset state is met and calculate a speed estimation value according to the intermediate voltage and the intermediate current a calculation subunit configured to calculate a mixed position angle of the starter generator in the switching duration by using the following formula and replace the set position angle with the mixed position angle to perform open-loop control on the starter generator: wherein, is the dynamic weight coefficient; and the determination subunit is configured to determine that the starter generator enters the second starting stage after the switching duration ends.

[0021] Optionally, the second control module comprises: an acquisition unit configured to acquire a second bus voltage and a second phase current of the starter generator in the second starting stage in real time; a conversion unit configured to convert the second bus voltage and the second phase current into a second intermediate voltage and a second intermediate current in a static rectangular coordinate, respectively; an output unit configured to input the second intermediate voltage and the second intermediate current into a pre-constructed sliding film observer to output a second back electromotive force estimation value of a current closed-loop control period; a processing unit configured to perform low-pass filtering and angle compensation on the second back electromotive force estimation value to obtain a second real-time rotor position estimation value of the starter generator in the current closed-loop control period; a calculation unit configured to perform differential calculation on the second real-time rotor position estimation value and a second historical rotor position estimation value to obtain a second speed estimation value of the current closed-loop control period; and a control unit configured to control the speed of the starter generator to continue to rise to the ignition speed of the micro gas turbine by taking the second real-time rotor position estimation value and the second speed estimation value as closed-loop feedback parameters.

[0022] According to another aspect of the embodiments of the present application, a storage medium is also provided, which comprises a stored program, and the program performs the above steps when running.

[0023] According to another aspect of the embodiments of the present application, an electronic device is also provided, which comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus; the memory is used to store a computer program; and the processor is used to execute the steps in the above method by running the program stored in the memory.

[0024] This application also provides a computer program product containing instructions that, when run on a computer, cause the computer to perform the steps in the above-described method.

[0025] The beneficial effects of this invention are: 1. The sensorless start-up phase of the micro gas turbine includes three parts: open-loop start-up, switching process, and closed-loop control. This ensures the reliability of the rotor position and speed information of the generator throughout the start-up phase. The micro gas turbine can occupy a small volume to generate electricity on the vehicle while ensuring reliability. This solves the technical problem of the volume occupied by the micro gas turbine start-up controlled by the position sensor in the existing technology, reduces the cost and volume of the power generation system, and improves the reliability of the power generation system in extreme environments such as high temperature. 2. In the first startup phase of open-loop control, the generator is driven to rotate in open loop by applying a current vector with constant amplitude and frequency that increases with time through the motor controller. The load angle is introduced, and the frequency of the open-loop current vector is adjusted by the change of the load angle, which can avoid unstable speed waves or even loss of synchronization during open-loop startup. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a hardware structure block diagram of a motor controller according to an embodiment of the present invention; Figure 2 This is a flowchart of a startup method for a micro gas turbine according to an embodiment of the present invention; Figure 3 This is a schematic block diagram of the micro gas turbine power generation system in an embodiment of the present invention; Figure 4 This is a schematic diagram of the open-loop control principle according to an embodiment of the present invention; Figure 5 This is a flowchart illustrating the switching process from open-loop control to closed-loop control in an embodiment of the present invention. Figure 6 This is a flowchart of the sensorless algorithm for estimating rotational speed and position information in an embodiment of the present invention; Figure 7 This is a flowchart of the sensorless startup method for a micro gas turbine in an embodiment of the present invention; Figure 8 This is a structural block diagram of a starting device for a micro gas turbine according to an embodiment of the present invention. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present application can be combined with each other.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] Example 1 The method embodiment provided in Embodiment 1 of this application can be executed in an automobile, processor, motor, vehicle power controller, motor controller, or similar processing device. Taking its operation on a motor controller as an example, Figure 1 This is a hardware structure block diagram of a motor controller according to an embodiment of the present invention. Figure 1 As shown, the motor controller may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. Optionally, the motor controller may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the motor controller described above. For example, the motor controller may also include a... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0030] The memory 104 can be used to store motor controller programs, such as application software programs and modules, like the motor controller program corresponding to the micro gas turbine starting method of a motor controller in an embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the motor controller program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the motor controller via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0031] The transmission device 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the communication provider of the motor controller. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 may be a Radio Frequency (RF) module used for wireless communication with the Internet.

[0032] This embodiment provides a method for starting a micro gas turbine. Figure 2 This is a flowchart of a startup method for a micro gas turbine according to an embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps: Step S201: In response to the start signal of the micro gas turbine, start the generator and enter the first start-up stage. In the first start-up stage, the speed of the generator is increased by open-loop control. The generator and the micro gas turbine are connected by a coupling. Optionally, the generator can be a permanent magnet synchronous motor, and the micro gas turbine and its starting system in this embodiment can be applied to vehicles.

[0033] Figure 3 This is a schematic block diagram of the micro gas turbine power generation system in this embodiment of the invention, including a vehicle controller 100, a motor controller 101, a motor main control unit 102, a power converter 103, a permanent magnet synchronous motor 104, a micro gas turbine 105, a gas turbine controller 106, a high-voltage battery 107, system transmission signals, a motor U-phase winding 5, a motor V-phase winding 6, a motor W-phase winding 7, and a coupling 8 connecting the permanent magnet synchronous motor and the micro gas turbine.

[0034] The micro gas turbine is started up by a motor controller 101. The motor controller 101 mainly includes a motor main control unit 102 and a power converter 103.

[0035] The vehicle controller 100 sends a start signal and a speed request signal to the motor main control unit 102 inside the motor controller 101. The ignition speed required for the micro gas turbine 105 to complete the start is provided by the speed request signal from the vehicle controller 100. After receiving the signal, the motor main control unit 102 ultimately controls the permanent magnet synchronous motor 104 to reach the required speed according to the start strategy.

[0036] The motor main control unit 102 outputs switch status signals to control the power converter 103 to turn on and off. The motor main control unit 102 receives the start signal from the vehicle controller 100 to control the permanent magnet synchronous motor 104 to start, and estimates the speed and position information of the permanent magnet synchronous motor 104 in real time based on the real-time collected bus voltage signal and phase current signal. During the start-up process, the estimated speed and position information is unreliable when the speed decreases from zero to low speed. At this time, the motor controller 101 adopts a fixed amplitude, variable frequency open-loop start-up. After the estimated information becomes reliable, it gradually switches to sensorless closed-loop control, ultimately controlling the permanent magnet synchronous motor 104 to reach the ignition speed and completing the start-up. The power converter 103 controls the opening and closing of the phase windings of the permanent magnet synchronous motor to output the voltage control vector required by the permanent magnet synchronous motor 104, thereby realizing the open-loop and closed-loop control of the motor.

[0037] In this example, a permanent magnet synchronous motor 104 is selected as the starter generator. During startup, it drives the micro gas turbine 105 to the ignition speed through the coupling 8 with the micro gas turbine.

[0038] The operation of the micro gas turbine 105 is controlled by the gas turbine controller 106. After the start-up is completed, the vehicle controller 100 switches the micro gas turbine power generation system to power generation mode. The micro gas turbine 105 drives the permanent magnet synchronous motor 104 to rotate at a speed not lower than the ignition speed, thereby generating electricity.

[0039] The high-voltage battery 107 provides starting energy for the micro gas turbine power generation system. When the system is in power generation mode, the permanent magnet synchronous motor 104 feeds energy back to the high-voltage battery through the power converter.

[0040] Step S202: During the first startup phase, the first bus voltage and the first phase current of the generator are collected in real time. In this embodiment, the power applied to the generator is three-phase electricity.

[0041] Step S203: Based on the first bus voltage and the first phase current, control the generator to switch from the first startup stage to the second startup stage; Between the first and second start-up stages, there is a switching stage. During the switching stage, a hybrid control method combining open-loop and closed-loop control is used to control the generator speed.

[0042] In step S204, during the second startup phase, the rotational speed of the generator is continuously increased through closed-loop control to reach the ignition speed of the micro gas turbine.

[0043] Through the above steps, in response to the start signal of the micro gas turbine, the generator is started and enters the first start-up stage. In the first start-up stage, the speed of the generator is increased through open-loop control, wherein the generator and the micro gas turbine are connected by a coupling. In the first start-up stage, the first bus voltage and the first phase current of the generator are collected in real time. Based on the first bus voltage and the first phase current, the generator is controlled to switch from the first start-up stage to the second start-up stage. In the second start-up stage, the speed of the generator continues to increase through closed-loop control to reach the ignition speed of the micro gas turbine. The micro gas turbine can occupy a small volume for vehicle-mounted power generation while ensuring reliability. This solves the technical problem of the volume occupied by controlling the start-up of the micro gas turbine through position sensors in the prior art, reduces the cost and volume of the power generation system, and improves the reliability of the power generation system in extreme environments such as high temperature.

[0044] In one embodiment of this example, controlling the speed increase of the generator by open-loop control includes: real-time reading of a set position angle during the open-loop control process from the open-loop control parameters of the generator, wherein the set position angle increases from zero; determining a constant current amplitude and an initial frequency corresponding to the set position angle, wherein the initial frequency increases from zero following the set position angle; dynamically generating a rotating current vector based on the constant amplitude and the initial frequency, wherein the electromagnetic torque of the rotating current vector is greater than the maximum load torque of the micro gas turbine; and applying the rotating current vector to the generator to accelerate the rotor speed of the generator from rest.

[0045] The set position angle in this embodiment is the open-loop control angle in the open-loop control process. , is a pre-configured dynamic angle value obtained by integrating the given frequency during open-loop control, which continuously increases and is used as the set angle for open-loop control.

[0046] During the startup process of the micro gas turbine, the micro gas turbine power generation system acquires phase current signals and bus voltage signals in real time, and estimates the rotor position and speed information of the permanent magnet synchronous motor in real time. Since the back EMF of the motor is very small and subject to large interference at zero speed and low speed, the speed and position information estimated by the system through the back EMF signal at this time is unreliable. Therefore, an open-loop startup strategy is adopted.

[0047] In the first startup phase of open-loop control, the motor controller applies a rotating current vector with constant amplitude and frequency increasing over time based on a set position angle, causing the rotor to accelerate from rest. By precisely controlling the rise slope of the current amplitude and frequency, the starting torque is ensured to be greater than the load resistance torque, thus achieving smooth and controllable acceleration.

[0048] For the open-loop start-up of the first stage, a current vector signal with a certain amplitude and frequency that increases over time needs to be provided. Since the load torque of the micro gas turbine changes with the increase of speed throughout the start-up process, the electromagnetic torque corresponding to the current vector needs to be greater than the peak torque of the micro gas turbine during the start-up stage when setting the open-loop control current amplitude. This current amplitude can be given after experimental calibration based on the torque characteristics of the micro gas turbine.

[0049] In one example, dynamically generating a rotating current vector based on the constant amplitude and initial frequency includes: real-time acquisition of the three-phase current of the generator; performing Clark transformation on the three-phase current to obtain component currents in a two-phase stationary coordinate system; calculating the current position angle of the generator using the component currents, and estimating the back EMF position angle using the component currents; converting the back EMF position angle into a rotor position angle; configuring the actual current frequency of the initial frequency in the current control cycle according to the current position angle and the rotor position angle, and generating a rotating current vector based on the actual current frequency and the constant amplitude.

[0050] Optionally, configuring the actual current frequency of the initial frequency in the current control cycle based on the current position angle and the rotor position angle includes: calculating the deviation angle between the current position angle and the rotor position angle; determining whether the deviation angle is greater than a safety threshold; if the deviation angle is greater than the safety threshold, reducing the initial frequency of the current control cycle to obtain a first actual current frequency; if the deviation angle is less than or equal to the safety threshold, maintaining the initial frequency of the current control cycle to obtain a second actual current frequency.

[0051] In the first startup phase, when setting the open-loop control frequency, it is necessary to consider that the actual speed of the permanent magnet synchronous motor can follow the signal without speed instability or even loss of synchronization. Based on this, this embodiment is based on the load angle. Adjust the open-loop set frequency. Figure 4 This is a schematic diagram of the open-loop control principle according to an embodiment of the present invention. , The three-phase currents of the permanent magnet synchronous motor 104 are represented by Clark transformation, which yields the currents in the two-phase stationary coordinate system. ,in accordance with The current stator current position angle can be obtained. .also, As an input to sensorless algorithms (such as sliding mode observers, SMO), the position angle of the back electromotive force can be obtained after estimation. Since the back EMF angle is fixed and leads the rotor d-axis at a right angle of 90°, the estimated rotor position angle is obtained. for: ; Therefore, the stator current is the deviation between the right angle and the rotor d-axis position angle. for: ; The deviation angle That is, the load angle, when When the value gradually increases and exceeds the safety threshold, it indicates that the rotor position is close to the set open-loop position. If the deviation is too large, the open-loop frequency needs to be reduced. The rate of increase or appropriate decrease until the load angle The speed will drop back to a safe range to avoid the risk of losing synchronization during open-loop startup.

[0052] In one embodiment of this example, controlling the generator to switch from the first startup stage to the second startup stage based on the first bus voltage and the first phase current includes: converting the first bus voltage and the first phase current into a first intermediate voltage and a first intermediate current in a stationary rectangular coordinate axis, respectively; determining whether the generator meets a preset state based on the first intermediate voltage and the first intermediate current; and controlling the generator to switch from the first startup stage to the second startup stage if the generator meets the preset state.

[0053] In one example, determining whether the generator meets a preset state based on the first intermediate voltage and the first intermediate current includes: inputting the first intermediate voltage and the first intermediate current into a pre-constructed sliding diaphragm observer to output a first back EMF estimate for the current open-loop control cycle; performing low-pass filtering and angle compensation on the first back EMF estimate to obtain a first real-time rotor position estimate for the generator in the current open-loop control cycle; performing differential calculations on the first real-time rotor position estimate and the first historical rotor position estimate to obtain a first speed estimate for the current open-loop control cycle; determining whether the first back EMF estimate is greater than a first threshold and whether the first speed estimate is greater than a second threshold; if, in multiple consecutive open-loop control cycles, the first back EMF estimate is greater than the first threshold and the first speed estimate is greater than the second threshold, it is determined that the generator meets a preset state.

[0054] In one example, controlling the starter generator to switch from the first start-up phase to the second start-up phase includes: determining the switching duration between the first start-up phase and the second start-up phase; configuring a dynamic weighting coefficient within the switching duration, wherein the dynamic weighting coefficient is a slope increasing from 0 to 1; and determining the set position angle for the open-loop control of the starter generator after a preset state is met. And calculate the speed estimate based on the intermediate voltage and the intermediate current. The mixing position angle of the generator during the switching duration is calculated using the following formula. The generator is then subjected to open-loop control by replacing the set position angle with the mixed position angle. ,in, The dynamic weighting coefficient is used to determine whether the generator enters the second startup phase after the switching time ends.

[0055] During the transition from the first startup phase to the second startup phase, as the speed of the permanent magnet synchronous motor gradually increases, the estimated value derived from the back electromotive force becomes increasingly reliable. Once the estimated speed exceeds a certain value and certain conditions are met, the switching process from open-loop to closed-loop control begins. At this time, the rotor position angle used for calculation... Set position angle controlled by open loop Change to the estimated position The commonly obtained transition angle Until the switching process is complete, the rotor position angle depends entirely on the estimated position. At this point, the speed loop is connected, the second start-up stage is entered, the switching is completed, and the sensorless closed-loop control state is entered.

[0056] Figure 5This is a flowchart illustrating the switching process from open-loop control to closed-loop control in an embodiment of the present invention, including: S501, open-loop control; S502, obtaining an estimated speed value and determining whether the condition "estimated speed is greater than and back EMF is greater than a certain value for 50ms" is met; S503, if met, starting the switching, the rotor position changes from the open-loop setpoint to the estimated value; if not met, continuing open-loop control; S504, the rotor position depends entirely on the estimated value, entering closed-loop control; S505, connecting the speed loop and feeding back the speed dependence on the estimated value.

[0057] In the open-loop control process, the position angle used for current frequency control is... When the permanent magnet synchronous motor speed and extended back EMF are higher than a certain value and remain above a certain value for a certain period of time (e.g., 50ms), switching begins. At this time, the current frequency control angle is... It can be represented as follows: In the formula, For weighting coefficients. When When =1, the feedback speed depends entirely on ; When the value is 0, the feedback speed depends entirely on the estimated speed obtained by the sensorless algorithm. Upon entering step S204, the micro gas turbine power generation system enters the sensorless algorithm closed-loop startup state. Among these, the weighting coefficients... To estimate the rotational speed A linear transformation of variables can be expressed as: In the formula, The switching cycle represents the time required for the entire switching process and can be determined through prior simulation and experimental calibration. The rotor position is entirely dependent on... After that, at this time by Estimated rotational speed obtained by differential calculation Completely reliable, the speed loop is connected in step S505 to complete the switching process.

[0058] In this embodiment, controlling the generator speed to continue increasing to reach the ignition speed of the micro gas turbine through closed-loop control includes: real-time acquisition of the second bus voltage and second phase current of the generator during the second start-up phase; converting the second bus voltage and second phase current into a second intermediate voltage and second intermediate current in a stationary rectangular coordinate system, respectively; inputting the second intermediate voltage and second intermediate current into a pre-constructed sliding diaphragm observer and outputting a second back EMF estimate for the current closed-loop control cycle; performing low-pass filtering and angle compensation on the second back EMF estimate to obtain a second real-time rotor position estimate of the generator in the current closed-loop control cycle; performing differential calculations on the second real-time rotor position estimate and the second historical rotor position estimate to obtain a second speed estimate for the current closed-loop control cycle; and using the second real-time rotor position estimate and the second speed estimate as closed-loop feedback parameters to control the generator speed to continue increasing to reach the ignition speed of the micro gas turbine.

[0059] After completing the switching process from open loop to closed loop, the motor controller performs closed-loop control entirely based on the estimated speed and position information as feedback.

[0060] Figure 6 This is a flowchart illustrating the estimation of rotational speed and position information using a sensorless algorithm in this embodiment of the invention. The system runs this algorithm in both the open-loop and closed-loop control phases. However, the algorithm is inaccurate in the open-loop control phase and is only used as a switching condition. In this example, a sliding mode observer is used as the estimation strategy for the sensorless algorithm. In the second startup phase, it can obtain reliable rotational speed and position information at high motor speeds. The process includes: S601, acquiring the power converter bus voltage and motor phase current signals; S602, processing the current and voltage signals into electrical and voltage signals in a stationary Cartesian coordinate system; S603, using a sliding mode observer to obtain an estimate of the back EMF in the stationary Cartesian coordinate system, and obtaining the estimated values ​​of position and rotational speed from the back EMF. In S601, the motor controller obtains bus voltage information and phase current information through bus voltage and voltage sensors. In S602, the information is processed and converted into current and voltage signals in a stationary rectangular coordinate system. In S603, a sliding diaphragm observer is designed to obtain the back EMF estimate. After low-pass filtering and angle compensation, the estimated value of the motor rotor position is obtained. After differential calculation, the estimated value of the rotational speed is obtained.

[0061] This embodiment provides a sensorless start-up method for a micro gas turbine power generation system. The motor controller starts the micro gas turbine by driving the generator through open-loop control, gradually increasing the speed. After the motor reaches a certain speed, the open-loop control is switched to closed-loop control based on a sensorless algorithm. Finally, the motor is controlled to drive the micro gas turbine to the ignition speed, completing the start-up.

[0062] Figure 7This is a flowchart of a sensorless startup method for a micro gas turbine in an embodiment of the present invention, including: S701, the vehicle controller sends a startup request; S702, open-loop control starts the generator: a rotating current vector with constant amplitude and linearly increasing frequency over time is applied, the traction motor rotor accelerates from rest, and synchronously drives the micro gas turbine to rotate; S703, when the estimated speed is higher than a certain value and maintained for a period of time, the switching process from open-loop control to closed-loop control is initiated, and the feedback speed and position information gradually switches from the open-loop setpoint to the estimated value; S704, the generator fully enters the closed-loop control mode with sensorless control output as feedback, and continues to drive the micro gas turbine to the ignition speed until ignition is completed, thus achieving startup.

[0063] Before the micro gas turbine power generation system can drive the generator to generate electricity, it must first drive the micro gas turbine to the ignition speed to complete ignition before starting. The starting process is completed by the motor controller inside the power generation system controlling the generator to drive the micro gas turbine to rotate. In the initial stage of startup, the motor speed is low, and the estimated values ​​of position and speed obtained by the sensorless algorithm are inaccurate and susceptible to interference. Therefore, open-loop control is used to drive the motor speed to increase. This invention drives the generator to rotate in an open loop by applying a current vector with a constant amplitude and a frequency that increases with time through the motor controller. A load angle (the angle between the stator current vector position and the estimated rotor d-axis position) is introduced. The frequency of the open-loop current vector is adjusted by the change of the load angle, thereby preventing abnormal fluctuations in motor speed and loss of synchronization.

[0064] Throughout the entire startup process, from start to finish and subsequent power generation control, the micro gas turbine power generation system needs to collect the motor's bus voltage and phase current signals, and estimate the rotor position and speed information in real time based on these signals.

[0065] During the mid-startup phase, the motor speed is relatively high, and the estimated rotor position and speed become reliable. This invention employs a switching strategy to gradually transition the system from open-loop control to closed-loop control. This closed-loop control uses the estimated values ​​obtained from a sensorless algorithm as feedback signals. After this switching is completed, the system enters the later startup phase. The motor controller uses closed-loop control to continue increasing the motor speed to reach the ignition speed, and the motor continuously drives the micro gas turbine until startup is complete.

[0066] The sensorless start-up method for micro gas turbines using the scheme in this embodiment includes three parts: open-loop start-up, switching process, and closed-loop control. This ensures the reliability of the motor rotor position and speed information, and achieves the effect of reducing system size and cost.

[0067] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0068] Example 2 This embodiment also provides a starting device for a micro gas turbine, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0069] Figure 8 This is a structural block diagram of a starting device for a micro gas turbine according to an embodiment of the present invention, as shown below. Figure 8 As shown, the device includes: The first control module 81 is used to respond to the start signal of the micro gas turbine, start the generator and enter the first start-up stage. In the first start-up stage, the speed of the generator is increased by open-loop control. The generator and the micro gas turbine are connected by a coupling. The acquisition module 82 is used to acquire the first bus voltage and the first phase current of the generator in real time during the first startup phase. Switching module 83 is used to control the generator to switch from the first starting stage to the second starting stage based on the first bus voltage and the first phase current; The second control module 84 is used to, during the second startup phase, control the generator speed to continue increasing to reach the ignition speed of the micro gas turbine through closed-loop control.

[0070] Optionally, the first control module includes: a reading unit, configured to read a set position angle in real time from the open-loop control parameters of the generator during the open-loop control process, wherein the set position angle increases from zero; a determining unit, configured to determine a constant current amplitude and an initial frequency corresponding to the set position angle, wherein the initial frequency increases from zero following the set position angle; a generating unit, configured to dynamically generate a rotating current vector based on the constant amplitude and the initial frequency, wherein the electromagnetic torque of the rotating current vector is greater than the maximum load torque of the micro gas turbine; and an acceleration unit, configured to apply the rotating current vector to the generator to accelerate the rotor speed of the generator from rest.

[0071] Optionally, the generation unit includes: an acquisition subunit for acquiring the three-phase current of the generator in real time; a transformation subunit for performing Clark transformation on the three-phase current to obtain component currents in a two-phase stationary coordinate system; a calculation subunit for calculating the current position angle of the generator using the component currents and estimating the back EMF position angle using the component currents; a conversion subunit for converting the back EMF position angle into a rotor position angle; and a configuration subunit for configuring the actual current frequency of the initial frequency in the current control cycle according to the current position angle and the rotor position angle, and generating a rotating current vector based on the actual current frequency and the constant amplitude.

[0072] Optionally, the configuration subunit is further configured to: calculate the deviation angle between the current position angle and the rotor position angle; determine whether the deviation angle is greater than a safety threshold; if the deviation angle is greater than the safety threshold, reduce the initial frequency of the current control cycle to obtain a first actual current frequency; if the deviation angle is less than or equal to the safety threshold, maintain the initial frequency of the current control cycle to obtain a second actual current frequency.

[0073] Optionally, the switching module includes: a conversion unit, configured to convert the first bus voltage and the first phase current into a first intermediate voltage and a first intermediate current under a stationary rectangular coordinate axis, respectively; a judgment unit, configured to determine whether the generator meets a preset state based on the first intermediate voltage and the first intermediate current; and a control unit, configured to control the generator to switch from the first startup stage to the second startup stage if the generator meets the preset state.

[0074] Optionally, the judgment unit includes: a processing subunit, used to input the first intermediate voltage and the first intermediate current into a pre-constructed sliding diaphragm observer, and output a first back EMF estimate for the current open-loop control cycle; a compensation subunit, used to perform low-pass filtering and angle compensation on the first back EMF estimate to obtain a first real-time rotor position estimate of the generator in the current open-loop control cycle; a calculation subunit, used to perform differential calculation on the first real-time rotor position estimate and the first historical rotor position estimate to obtain a first speed estimate for the current open-loop control cycle; a judgment subunit, used to determine whether the first back EMF estimate is greater than a first threshold, and whether the first speed estimate is greater than a second threshold; and a determination subunit, used to determine that the generator meets a preset state if, in multiple consecutive open-loop control cycles, the first back EMF estimate is greater than the first threshold and the first speed estimate is greater than the second threshold.

[0075] Optionally, the control unit includes: a determining subunit for determining the switching duration between the first startup phase and the second startup phase; a configuring subunit for configuring dynamic weighting coefficients within the switching duration, wherein the dynamic weighting coefficients are a slope increasing from 0 to 1; and a processing subunit for determining the set position angle of the open-loop control of the generator after a preset state is met. And calculate the speed estimate based on the intermediate voltage and the intermediate current. The calculation subunit is used to calculate the mixed position angle of the generator during the switching duration using the following formula. The generator is then subjected to open-loop control by replacing the set position angle with the mixed position angle. ,in, The dynamic weighting coefficient is used to determine the second startup phase of the generator after the switching time has ended.

[0076] Optionally, the second control module includes: a data acquisition unit for real-time acquisition of the second bus voltage and second phase current of the generator during the second startup phase; a conversion unit for converting the second bus voltage and second phase current into a second intermediate voltage and second intermediate current in a stationary rectangular coordinate system, respectively; an output unit for inputting the second intermediate voltage and second intermediate current into a pre-built sliding diaphragm observer and outputting a second back EMF estimate for the current closed-loop control cycle; a processing unit for performing low-pass filtering and angle compensation on the second back EMF estimate to obtain a second real-time rotor position estimate of the generator in the current closed-loop control cycle; a calculation unit for performing differential calculation on the second real-time rotor position estimate and the second historical rotor position estimate to obtain a second speed estimate for the current closed-loop control cycle; and a control unit for using the second real-time rotor position estimate and the second speed estimate as closed-loop feedback parameters to control the generator speed to continue increasing to reach the ignition speed of the micro gas turbine.

[0077] It should be noted that the above modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0078] Example 3 Embodiments of the present invention also provide a storage medium storing a computer program, wherein the computer program is configured to execute the steps in any of the above method embodiments when running.

[0079] Optionally, in this embodiment, the storage medium may be configured to store a computer program for performing the following steps: S1, in response to the start signal of the micro gas turbine, start the generator and enter the first start-up stage. In the first start-up stage, the speed of the generator is increased by open-loop control. The generator and the micro gas turbine are connected by a coupling. S2, during the first startup phase, the first bus voltage and the first phase current of the generator are collected in real time; S3, based on the first bus voltage and the first phase current, control the generator to switch from the first startup stage to the second startup stage; S4, in the second start-up phase, the speed of the generator continues to increase through closed-loop control to reach the ignition speed of the micro gas turbine.

[0080] Optionally, in this embodiment, the storage medium may include, but is not limited to, various media capable of storing computer programs, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0081] Embodiments of the present invention also provide an electronic device including a memory and a processor, the memory storing a computer program and the processor being configured to run the computer program to perform the steps in any of the above method embodiments.

[0082] Optionally, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor and the input / output device is connected to the processor.

[0083] Optionally, in this embodiment, the processor can be configured to perform the following steps via a computer program: S1, in response to the start signal of the micro gas turbine, start the generator and enter the first start-up stage. In the first start-up stage, the speed of the generator is increased by open-loop control. The generator and the micro gas turbine are connected by a coupling. S2, during the first startup phase, the first bus voltage and the first phase current of the generator are collected in real time; S3, based on the first bus voltage and the first phase current, control the generator to switch from the first startup stage to the second startup stage; S4, in the second start-up phase, the speed of the generator continues to increase through closed-loop control to reach the ignition speed of the micro gas turbine.

[0084] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0085] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0086] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0087] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0088] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for starting a micro gas turbine, characterized in that, include: In response to the start signal of the micro gas turbine, the generator is started and enters the first start-up stage. In the first start-up stage, the speed of the generator is increased by open-loop control. The generator and the micro gas turbine are connected by a coupling. During the first startup phase, the first bus voltage and the first phase current of the generator are collected in real time. Based on the first bus voltage and the first phase current, the generator is controlled to switch from the first starting stage to the second starting stage; During the second startup phase, the speed of the generator continues to increase through closed-loop control to reach the ignition speed of the micro gas turbine.

2. The method according to claim 1, characterized in that, The increase in generator speed through open-loop control includes: The set position angle during the open-loop control process is read in real time from the open-loop control parameters of the generator, wherein the set position angle increases from zero. Determine the constant current amplitude and initial frequency corresponding to the set position angle, wherein the initial frequency increases from zero following the set position angle; A rotating current vector is dynamically generated based on the constant amplitude and initial frequency, wherein the electromagnetic torque of the rotating current vector is greater than the maximum load torque of the micro gas turbine. The rotating current vector is applied to the generator to accelerate the rotational speed of the generator's rotor from rest.

3. The method according to claim 2, characterized in that, Dynamically generating a rotating current vector based on the constant amplitude and initial frequency includes: The three-phase current of the generator is collected in real time; The three-phase currents are subjected to Clark transformation to obtain the component currents in the two-phase stationary coordinate system; The current position angle of the generator is calculated using the component current, and the back EMF position angle is estimated using the component current. Convert the back EMF position angle into a rotor position angle; Configure the actual current frequency of the initial frequency in the current control cycle according to the current position angle and the rotor position angle, and generate a rotating current vector based on the actual current frequency and the constant amplitude.

4. The method according to claim 3, characterized in that, Configuring the actual current frequency in the current control cycle based on the initial frequency and the rotor position angle includes: Calculate the deviation angle between the current position angle and the rotor position angle; Determine whether the deviation angle is greater than the safety threshold; If the deviation angle is greater than the safety threshold, the initial frequency of the current control cycle is reduced to obtain the first actual current frequency; if the deviation angle is less than or equal to the safety threshold, the initial frequency of the current control cycle is maintained to obtain the second actual current frequency.

5. The method according to claim 1, characterized in that, Controlling the generator to switch from the first startup phase to the second startup phase based on the first bus voltage and the first phase current includes: The first bus voltage and the first phase current are respectively converted into the first intermediate voltage and the first intermediate current under the stationary rectangular coordinate axis; Determine whether the generator meets the preset state based on the first intermediate voltage and the first intermediate current; If the generator meets the preset state, control the generator to switch from the first start-up stage to the second start-up stage.

6. The method according to claim 5, characterized in that, Determining whether the generator meets the preset state based on the first intermediate voltage and the first intermediate current includes: The first intermediate voltage and the first intermediate current are input into a pre-constructed sliding diaphragm observer, and the first back EMF estimate of the current open-loop control cycle is output. The first back EMF estimate is low-pass filtered and angle compensated to obtain the first real-time rotor position estimate of the generator in the current open-loop control cycle. Differential calculations are performed on the first real-time rotor position estimate and the first historical rotor position estimate to obtain the first speed estimate of the current open-loop control cycle; Determine whether the first back EMF estimate is greater than a first threshold, and determine whether the first rotational speed estimate is greater than a second threshold; If, within multiple consecutive open-loop control cycles, the first back EMF estimate is greater than the first threshold and the first speed estimate is greater than the second threshold, it is determined that the generator meets the preset state.

7. The method according to claim 5, characterized in that, Controlling the generator to switch from the first startup phase to the second startup phase includes: Determine the switching duration between the first startup phase and the second startup phase; Configure a dynamic weighting coefficient within the switching duration, wherein the dynamic weighting coefficient is a sloping line that rises from 0 to 1; Determine the set position angle of the open-loop control of the generator after it meets the preset state. And calculate the speed estimate based on the intermediate voltage and the intermediate current. ; The mixing position angle of the generator during the switching time is calculated using the following formula. The generator is then subjected to open-loop control by replacing the set position angle with the mixed position angle. ,in, These are dynamic weighting coefficients; After the switching time has ended, the generator is determined to enter the second startup phase.

8. The method according to claim 1, characterized in that, The closed-loop control of the generator speed continues to increase to reach the ignition speed of the micro gas turbine, including: Real-time acquisition of the second bus voltage and second phase current of the generator during the second startup phase; The second bus voltage and the second phase current are respectively converted into the second intermediate voltage and the second intermediate current under the stationary rectangular coordinate axis; The second intermediate voltage and the second intermediate current are input into a pre-constructed sliding diaphragm observer, which outputs the second back EMF estimate for the current closed-loop control cycle. The second back EMF estimate is low-pass filtered and angle compensated to obtain the second real-time rotor position estimate of the generator in the current closed-loop control cycle. By performing differential calculations on the second real-time rotor position estimate and the second historical rotor position estimate, the second speed estimate for the current closed-loop control cycle is obtained. Using the second real-time rotor position estimate and the second speed estimate as closed-loop feedback parameters, the speed of the generator is controlled to continue to rise to reach the ignition speed of the micro gas turbine.

9. A starting device for a micro gas turbine, characterized in that, include: The first control module is used to respond to the start signal of the micro gas turbine, start the generator and enter the first start-up stage. In the first start-up stage, the speed of the generator is increased by open-loop control. The generator and the micro gas turbine are connected by a coupling. The acquisition module is used to acquire the first bus voltage and first phase current of the generator in real time during the first startup phase. The switching module is used to control the generator to switch from the first starting stage to the second starting stage based on the first bus voltage and the first phase current. The second control module is used to, during the second startup phase, control the generator speed to continue increasing to reach the ignition speed of the micro gas turbine through closed-loop control.

10. The apparatus according to claim 9, characterized in that, The switching module includes: A conversion unit is used to convert the first bus voltage and the first phase current into a first intermediate voltage and a first intermediate current under a stationary rectangular coordinate axis, respectively. The judgment unit is used to determine whether the generator meets the preset state based on the first intermediate voltage and the first intermediate current; The switching unit is used to control the generator to switch from the first starting stage to the second starting stage if the generator meets the preset state.

11. A storage medium, characterized in that, The storage medium stores a computer program, wherein the computer program is configured to execute the method described in any one of claims 1 to 8 when it is run.

12. An electronic device comprising a memory and a processor, characterized in that, The memory stores a computer program, and the processor is configured to run the computer program to perform the method as described in any one of claims 1 to 8.

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