A method, device and system for establishing control of a generator voltage based on power margin analysis and compensation

Abstract

This invention discloses a starter voltage build-up control method, device, and system based on power boundary analysis and compensation, belonging to the field of motor control. The method includes: acquiring the current parameters of the starter during the voltage build-up process, discretizing them to obtain the current time... k The rate of change of current; based on the first voltage boundary and the second voltage boundary, within the preset current safety margin, the compensation value of the current dynamic component is calculated; the maximum current change in the current switching cycle is calculated based on the compensation value of the current dynamic component; based on the maximum current change... k Current rate compensation is performed based on the rate of change of current at any given time. Key factors such as the rate of change of current, motor speed, and load characteristics are considered to achieve rapid and stable voltage establishment under different speed conditions.

Description

Technical Field

[0001] This invention belongs to the field of motor control, and more specifically, relates to a generator voltage establishment control method, device and system based on power boundary analysis and compensation. Background Technology

[0002] More-electric aircraft / all-electric aircraft have become a research hotspot in the aviation field due to their significant reduction in mechanical complexity, improved maneuverability, and enhanced energy efficiency through more-electric technology. With the rapid growth in electricity demand, traditional separate starter and generator designs, due to their large weight and low efficiency, are unable to meet the high-efficiency, high-power-density requirements of aviation. Therefore, the starter-generator, which integrates starting and power generation functions, has become a core component of more-electric aircraft.

[0003] Current research on starter generators mainly focuses on three aspects: generator type development, starting, and power generation control. Regarding generator types, various forms have been studied, including three-stage starter generators, induction starter generators, switched reluctance starter generators, electrically excited doubly salient pole starter generators, permanent magnet starter generators, and permanent magnet assisted starter generators. Permanent magnet assisted starter generators have attracted significant attention due to their high efficiency, high torque density, and high reliability with low demagnetization risk. In starting process research, the starter generator needs to cover the engine torque-speed characteristics at different temperatures, aiming for high dynamic response torque and current control. To shorten starting time, a composite control strategy combining constant torque and field weakening is often adopted. However, field weakening control may induce non-minimum phase states, leading to system instability. In power generation research, to meet high power demands, starter generators and generators are typically integrated on the high and low voltage shafts of the engine, forming a multi-source energy extraction architecture. Control strategies for multi-source energy distribution include master-slave control, centralized control, current sharing control, and droop control, but their communication reliability and stability boundaries still need improvement. Furthermore, the accumulation of negative impedance due to increased constant power loads reduces system stability. Existing research has optimized stability through small-signal analysis and dynamic droop controller design. Regarding power quality, the requirements for voltage fluctuations and dynamic performance must be met according to standards such as MIL-STD-704F. Existing transient tracking strategies and capacitor-based energy sharing control methods have reduced dynamic response time from 33 ms to tens of milliseconds.

[0004] While the aforementioned research has made progress in optimizing the starting and power generation functions of starter generators, the key characteristic of starter generators lies in achieving integrated starting and power generation functions during uninterrupted operation. The transition from starting to power generation is the core link in achieving this integration. Voltage build-up (VBU) requires a transition from an uncontrolled to a controlled state, and smooth control from the uncontrolled voltage to the rated voltage to construct the entire power grid. However, current research on VBU in the transition state is insufficient. Existing literature only points out that low bus voltage may lead to VBU failure and proposes control methods after failure, but lacks a systematic analysis of the dynamic VBU mechanism and effective compensation strategies. This leads to problems such as excessively long VBU times or even voltage build-up failures during the dynamic voltage build-up process of the starter generator, making it difficult to meet the stringent requirements of rapid starting and efficient power generation for multi-electric aircraft.

[0005] Overall, existing research on starter generators has achieved significant results in the independent optimization of starting and power generation functions. However, research on the dynamic VBU process during the transition from starting to power generation is insufficient, especially regarding the VBU mechanism analysis and compensation methods for permanent magnet assisted starter generators, which still require in-depth exploration. To address this technological gap, there is an urgent need to propose a fast and stable dynamic compensation method to shorten VBU time and avoid VBU failure, thus providing technical support for the start-to-power generation transition in multi-electric aircraft. Summary of the Invention

[0006] In view of the shortcomings of related technologies, the purpose of this invention is to provide a starter voltage establishment control method, device and system based on power boundary analysis and compensation, which solves the problem that the voltage establishment time of existing starters is long during the transition from start-up to power generation, which may lead to failure and makes it difficult to meet the technical problem of high dynamic response of the system.

[0007] To achieve the above objectives, this invention provides a generator voltage establishment control method based on power boundary analysis and compensation, comprising: Obtain the current parameters of the generator during the voltage build-up process, discretize them, and then obtain the current time. k Rate of change of current: , ; in, for d Axis in k The current derivative at time t, for q Axis in k The current derivative at time t, for d The reference current of the axis at time k. for q Axis in k Reference current at time [time] For switching cycles; Based on the first and second voltage boundaries, within the preset current safety margin, the compensation value for the current dynamic component is calculated: , ; in, For the original dynamic components of the q-axis, For the q-axis at k The dynamic component compensation value at time t. This represents the dynamic component compensation value of the d-axis at time k. For compensation coefficient, The value of is the value of the first voltage boundary. , As a preset safety margin, ; i q for q shaft current, ψ f The back electromotive force coefficient, L d for d Shaft inductor, L q for q Shaft inductance; and The value is between the value of the first voltage boundary and the value of the second voltage boundary; the first voltage boundary is the voltage value when the power of the magnetic field change and the power generation reach equilibrium during the voltage establishment process of the generator; the second voltage boundary is the voltage value when the power of the magnetic field change and the sum of the capacitor power and the power generation reach equilibrium during the voltage establishment process of the generator. Calculate the maximum current change during the current switching cycle based on the current dynamic component compensation value: , ; Based on the maximum current change k The current rate of change at any given time is used for current rate compensation to obtain the compensated reference current value: ; ; in, i d for d shaft current, The compensated d-axis reference current value. This is the original d-axis reference current value. The compensated q-axis reference current value. This is the original q-axis reference current value; Based on the operation command corresponding to the compensated reference current value, current rate compensation is performed on the voltage establishment process of the generator.

[0008] Optionally, the expression for the current dynamic component compensation value is:

[0009] in, ω e ω is the electric angular velocity.

[0010] Optional, also includes: The control parameters of the generator are obtained, and the magnetic field change power, capacitor power and power generation of the generator are calculated based on the control parameters during the voltage establishment process. ; ; ;

[0011] in, To generate the constantly changing magnetic field energy inside the generator, The rate of change of the magnetic field of the generator. P e To increase the generator's power output, This refers to the capacitor power of the generator.

[0012] Optionally, the expression for when the power of the magnetic field change and the power of the generator reach equilibrium is: ; in, , , , P loss This is for copper consumption.

[0013] Optionally, the expression for when the power of the magnetic field change reaches equilibrium with the sum of the capacitor power and the power generated is:

[0014] in, For capacitance, This is the capacitor voltage. This is the derivative of the capacitor voltage.

[0015] Secondly, the present invention also provides a generator voltage establishment control device based on power boundary analysis and compensation, comprising: The current change rate calculation module is used to obtain the current parameters of the generator during the voltage build-up process, and then discretize them to obtain the current time. k The rate of change of current; The dynamic component compensation value calculation module is used to calculate the dynamic component compensation value of the current based on the first voltage boundary and the second voltage boundary, within the preset current safety margin. The maximum current change calculation module is used to calculate the maximum current change in the current cycle based on the current dynamic component compensation value. The reference current value calculation module is used to calculate the reference current value based on the maximum current change. k The rate of change of current at any given time is used for current rate compensation to obtain the compensated reference current value; The compensation module is used to perform current rate compensation on the voltage establishment process of the generator according to the operation command corresponding to the compensated reference current value.

[0016] Thirdly, the present invention also provides a generator voltage establishment control system based on power boundary analysis and compensation, characterized in that it includes: a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the method provided in any of the first aspects.

[0017] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the generator voltage establishment control method based on power boundary analysis and compensation as described in any one of the first aspects.

[0018] Compared with the prior art, the above-described technical solutions conceived in this invention can achieve the following beneficial effects: 1. This invention provides a starter voltage establishment control method based on power boundary analysis and compensation. Based on a dynamic voltage establishment method for starters, it clarifies the influence of dynamic components on the voltage establishment process through power analysis, and divides the normal region, first voltage boundary, and second voltage boundary based on mechanism analysis, accurately establishing the dynamic constraints for voltage establishment. Based on the first and second voltage boundaries as constraints, current rate compensation is performed on the starter voltage establishment process within a preset safety margin. This solves the problem of long voltage establishment time and potential failure in existing starters during the transition from start-up to power generation, making it difficult to meet the technical requirements of high dynamic response in systems. Considering key factors such as current change rate, motor speed, and load characteristics, it achieves rapid and stable voltage establishment under different speed conditions.

[0019] 2. This invention provides a generator voltage establishment control method based on power boundary analysis and compensation, a dynamic voltage establishment method based on dynamic constraints, utilizing dynamic component constraints and discretization control strategies to... d shaft and qShaft current is compensated and constrained to generate optimized control signals, effectively shortening voltage settling time (from 20-30ms in traditional PI control to 15-17ms) and ensuring that the bus voltage does not fall below the 250V lower limit specified in the MIL-STD-704F standard, thus avoiding voltage drop. Compatible with both no-load and loaded conditions, it is suitable for the start-up-generation transition state of generators in multi-electric aircraft, significantly improving system dynamic performance and reliability, and providing crucial support for shortening engine ground start-up time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the engine starting and generating electricity. Figure 2 This is a schematic diagram of the power supply circuit for the initiation system; Figure 3 This is a schematic diagram of the equivalent circuit of the motor; Figure 4 This is a schematic diagram of dynamic component proportion analysis; Figure 5 A flowchart illustrating a generator voltage establishment control method based on power boundary analysis and compensation provided by the present invention; Figure 6 A schematic diagram of the dynamic boundary delineation for the voltage establishment process; Figure 7 Schematic diagrams showing the changes in voltage, current, and power under different boundary conditions; where (a) is the traditional method. u dc (b) Changes under the first voltage boundary condition; u dc (c) Changes between the first and second voltage boundaries; u dc Changes; (d) Traditional methods i dq (e) Changes under the first voltage boundary condition; i dq (f) Changes between the first and second voltage boundaries; i dq (g) Power variation under conventional methods; (h) Power variation under the first voltage boundary condition; (i) Power variation between the first and second voltage boundaries; Figure 8 A schematic diagram illustrating the establishment of a control strategy based on boundary-based fast voltage. Figure 9 This is a schematic diagram of the voltage and current analysis of the VBU at 3000 rpm; where (a) is not based on compensation. u dc Changes, (b) Based on compensation methodsu dc Change, (c) i q Current and dynamic components. (d) i d Current and dynamic components; Figure 10 This diagram illustrates a comparison of VBU time between the compensation method and the uncompensated method provided by this invention to simulate different transient engine speeds. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0022] The following description, in conjunction with a preferred embodiment, illustrates the content involved in the above embodiments.

[0023] Example 1 Before explaining the solution of this invention, the starter / generator (S / G) system and the voltage build-up (VBU) process will be briefly introduced below.

[0024] like Figure 1 As shown, the starter generator system in a multi-electric aircraft is the core component for engine starting and overall aircraft power supply. The starter generator (S / G) integrates starting and power generation functions, switching from starting mode to power generation mode through a start-to-power generation transition state. In starting mode, the S / G drives the engine to ignition speed using an external power source (such as an APU generator, ground power, or battery), then enters a transition state phase to complete dynamic voltage build-up (VBU) to switch from an uncontrolled state to a controllable state, establishing the target bus voltage (e.g., 270 VDC), and then entering power generation mode. Figure 2 As shown, the power supply circuit of the generator system includes a control switch. K c (Startup mode) and K p (Power generation mode) The mode switching is achieved by closing or opening the circuit. The key to the VBU process is to quickly and stably establish the bus voltage while avoiding voltage drops, so as to shorten the engine ground start-up time.

[0025] This invention employs a permanent magnet assisted reluctance S / G, which, due to its advantages of high torque density, low demagnetization risk, and high reliability, is suitable for the high-performance requirements of multi-electric aircraft. Figure 3 The equivalent circuit of S / G is shown, where the power generation ( P e ), copper loss ( P loss ) and the rate of change of magnetic field energy ( These factors collectively influence the VBU process. Traditional voltage control methods, based on steady-state analysis, use the voltage limit circle (VLC) to determine the current distribution strategy, but they cannot adapt to the dynamic process during the transition phase. In the dynamic VBU process, the output voltage component... u d , u q By supporting bus voltage u dc Maintain continuous operation of the VBU. Dynamic components are taken into account. and Analysis shows that, R s Decision p loss , L qd Decision It consumes output power p e of, The absorbed power is primarily used to establish a magnetic field, hence the absorption characteristics. In power generation mode, and , and The voltage is opposite, consuming the actual voltage and weakening it. u d and u q support u dc And the ability to support VBU. To analyze the relationship between dynamic components and voltage changes, a percentage is defined. and As shown in the formula; ; ; Dynamic components (such as the rate of change of inductor current) and This has a significant impact on the bus voltage support capability, especially at high speeds (3000-5500 rpm), where the dynamic component can account for 41%-70% (e.g., Figure 4 (As shown). Therefore, dynamic components need to be analyzed and compensated to achieve a fast and stable VBU.

[0026] like Figure 5As shown, this embodiment of the invention provides a generator voltage establishment control method based on power boundary analysis and compensation, including: Obtain the current parameters of the generator during the voltage build-up process, discretize them, and then obtain the current time. k Rate of change of current: , ; in, for d Axis in k The current derivative at time t, for q Axis in k The current derivative at time t, for d The reference current of the axis at time k. for q Axis in k Reference current at time [time] For switching cycles; Based on the first and second voltage boundaries, within the preset current safety margin, the compensation value for the current dynamic component is calculated: , ; in, The original dynamic component of the q-axis; For the q-axis at k The dynamic component compensation value at time t. This represents the dynamic component compensation value of the d-axis at time k. For compensation coefficient, The value is taken as the value of the first voltage boundary. , As a preset safety margin, ; i q for q shaft current, ψ f The back electromotive force coefficient, L d for d Shaft inductor, L q for q Shaft inductance; and The value is between the value of the first voltage boundary and the value of the second voltage boundary; the first voltage boundary is the voltage value when the power of the magnetic field change and the power generation reach equilibrium during the voltage establishment process of the generator; the second voltage boundary is the voltage value when the power of the magnetic field change and the sum of the capacitor power and the power generation reach equilibrium during the voltage establishment process of the generator. Calculate the maximum current change during the current switching cycle based on the current dynamic component compensation value: , ; Based on the maximum current change k The current rate of change at any given time is used for current rate compensation to obtain the compensated reference current value: ; ; in, i d for d shaft current, The compensated d-axis reference current value. This is the original d-axis reference current value. The compensated q-axis reference current value. This is the original q-axis reference current value; Based on the operation command corresponding to the compensated reference current value, current rate compensation is performed on the voltage establishment process of the generator.

[0027] To address the issues of voltage sag or excessively long build-up times during dynamic voltage buffering (VBU) processes using traditional methods, this invention clarifies the impact of dynamic components on the VBU process through power analysis. Based on the Lyapunov function, the dynamic boundaries of the VBU are delineated, yielding a first and second voltage boundary. A dynamic compensation strategy is then proposed to optimize the process. d shaft and q The shaft current control signal generates a PWM drive signal to improve VBU speed and stability. This achieves fast and stable voltage establishment, improving the start-up / generator switching rate. The specific solution is as follows: Obtain the control parameters of the permanent magnet assisted reluctance generator system, including the DC bus voltage. u dc Stator resistance R s , d Shaft inductor L d , q Shaft inductor L q Number of motor pole pairs p Electric angular velocity ω e Rated speed n Back potential coefficient ψ f .

[0028] Based on permanent magnet assisted reluctance motor d - q Voltage equations in the axial reference frame, considering dynamic components and A dynamic voltage constraint equation is constructed. The expression for the dynamic voltage constraint model is as follows:

[0029] in, u d , u q yes d - q Voltage of the shaft, i d and i q yes d - q shaft current, and denoted as the rate of change of current.

[0030] The boundary of the voltage build-up process (VBU) of the generator is analyzed based on the dynamic change of power; the magnetic field change power, capacitor power and generator power are calculated based on the control parameters of the generator; when the magnetic field change power and generator power reach equilibrium, the first voltage boundary is set; when the magnetic field change power reaches equilibrium with the sum of capacitor power and generator power, the second voltage boundary is set.

[0031] Specifically, this includes: constructing the Lyapunov function and analyzing power changes during the VBU process. Based on power variation, a Lyapunov function is constructed to analyze the first and second voltage boundaries and stability of the VBU system. ; ;

[0032] Among them, variables , , , respectively i d , i q and u dc The difference between the actual value and the reference value For capacitance, L d for d Shaft inductor, L q for q Shaft inductor, The voltage across the capacitor. The derivative of the capacitor voltage. To obtain the dynamic boundary, we first define the dynamic coefficients.

[0033] Where α is the dynamic coefficient. P e For power generation and The rate of change of magnetic field energy.

[0034] During the voltage build-up process of the generator, the power of the magnetic field change, the capacitor power, and the generator power all influence each other. The boundary conditions are analyzed through power changes as follows: In the normal area (NA): -1 < α < 0, that is... , <0, the system is stable, and the boundary of the normal region is recorded as the first voltage boundary. When When the power generation is greater than the magnetic field absorption power, the power output is positive, the system remains stable, and it can continuously support the VBU. At this time, the power generation capacity p e Greater than resistance loss p loss The power absorbed by the magnetic field, and the excess power, can ensure the continuous operation of the VBU.

[0035] make

[0036] in, ω e Electric angular velocity, i d for d shaft current, i q for q shaft current, i d,ref for d Shaft reference current, i q,ref This is the q-axis reference current. The d-axis current derivative is... Let ψ be the q-axis current derivative, and ψf be the back electromotive force coefficient. is the derivative coefficient.

[0037] Back EMF of bus voltage from uncontrolled state ωe ψ f To the target voltage, power generation p e Energy consumed by resistance p loss and the power absorbed by the magnetic field At this point, VBU reaches the first voltage boundary. At the first voltage boundary (FB), ,Right now Magnetic field power With motor power generation The situation is consistent; there is no more power generation to support magnetic field absorption, and the VBU capacity has reached the first voltage boundary, but the bus voltage will not drop.

[0038] The first voltage boundary constraint for the dynamic component is: ; ; ;

[0039] After the system crosses the first voltage boundary, the dynamic components After absorbing the generated power If the power demand still cannot be met, the capacitor power is absorbed from the DC current. Power absorbed by the magnetic field. Greater than power generation p e This leads to capacitor energy consumption, causing a drop in bus voltage. u dc A drop occurred, further weakening the VBU's capabilities. Once the DC-side energy was completely absorbed... Consumption capacity exceeded p e When the total power of the capacitor is exhausted, the capacitor's energy is completely depleted. This is defined as the second voltage boundary, or failure boundary, meaning that the energy is completely consumed and the voltage drops to zero. This causes the capacitor's energy to decrease to 0 V. The dynamic component absorbs energy to reach the second voltage boundary, the energy is completely consumed, and the voltage drops until it reaches 0 V. At the second voltage boundary (SB), The system operates between the first and second voltage boundaries. Less than 0, and P e Less than 0, at this time, The system is unstable and has lost its VBU capabilities.

[0040] The calculated second voltage boundary constraint for the dynamic component is as follows: ; ; ; ;

[0041] Dynamic VBU boundary partitioning based on power analysis: Power generation within the normal range p e Consumed by resistance loss p loss and magnetic field absorption But with As the voltage gradually increases, the system reaches the first voltage boundary, where the generated power matches the consumed power. After passing the first voltage boundary, the capacitor power will support the system to continue VBU (Voltage-Based Buffer) operation, at which point the VBU capability will increase. However, once the capacitor power is depleted, the system reaches the second voltage boundary and loses its VBU capability.

[0042] Based on mechanistic analysis, the dynamic VBU process is divided into two boundaries. An excessively fast VBU speed helps to quickly restore voltage, which is particularly suitable for in-flight restarts, while an excessively slow VBU speed will cause a delay in bus voltage establishment, which is not conducive to emergency situations.

[0043] To address this, this invention proposes a starter-generator voltage establishment control method based on power boundary analysis and compensation. By compensating and constraining the VBU rate within the boundary, the VBU speed is increased, VBU failure is prevented, and the system's dynamic performance is enhanced. This method requires no changes to additional control parameters, simply and efficiently increasing the VBU speed, providing a compressible time margin for the startup process, and shortening ground startup time.

[0044] Constrained by the first and second voltage boundaries, and within a preset safety margin, current rate compensation is performed on the voltage build-up process of the generator to ensure that the system can achieve stable and reliable VBU.

[0045] The dynamic components are approximated as:

[0046] in, The original dynamic components of the q-axis are calculated using existing methods.

[0047] To improve the speed of VBU using traditional methods, the first boundary is the basic VBU boundary, let... The value should be taken with reference to the value of the first voltage boundary:

[0048] in, To ensure a safety margin, the VBU speed is further compensated to prevent system failure. Considering this safety margin, and based on existing standards such as MIL-STD-704F, the lower limit of voltage drop is [value missing] when the bus voltage is 270 V. V lim Therefore, voltage drop is defined as:

[0049] Therefore, to ensure VBU speed and prevent the voltage from dropping to the second voltage boundary, a voltage drop boundary is defined as follows:

[0050] in, For compensation coefficient, As a preset safety margin, A preset safety margin is added to the first voltage boundary, which is defined as the dropout boundary.

[0051] Therefore, based on dynamic voltage constraints, dynamic component constraint values ​​can be obtained. ; ;

[0052] in, This is the compensation value for the dynamic component along the q-axis; furthermore, , ; after calculation Then, the dynamic component compensation values ​​of the d-axis and q-axis can be obtained. .

[0053] After entering the VBU, the control logic is based on the sampled voltage. u dc and reference voltage u d,cref The current result is obtained through error and integral control calculations. The expression is:

[0054] To achieve i d and i q By progressively controlling the components, the current during the generator voltage build-up process is discretized to obtain... k Rate of change of current at time:

[0055] in, The switching cycle.

[0056] actual i d , i q The components are calculated, and the maximum dynamic rate of change constraint under each switching cycle satisfies the formula.

[0057] Discretized based on dynamic component constraint values Each switching cycle can be obtained T s Below, the largest i d and i q Change:

[0058] Based on the actual situation within each cycle i d , i q Feedback values ​​are used for compensation and constraints. When the allowable rate of change of the difference between time k-1 and the current time k is greater than the maximum change constraint, the current reference value will be constrained; if the difference between time k and time k-1 is less than the maximum change constraint, it will be compensated; if the dynamic range is satisfied, it will be directly output to obtain the constrained reference value. ;

[0059] in, The compensated d-axis reference current value. This is the original d-axis reference current value. The compensated q-axis reference current value. This is the original q-axis reference current value. The original reference current value is the reference current value calculated using existing technical methods.

[0060] Furthermore, the VBU state only considers the no-load condition. However, if the loaded condition is considered, the above formula only needs to be modified to take into account the fluctuations caused by the load power. Therefore, this method is applicable to both the starter / generator transition state and the generator generating state, and the system can have good control performance and compatibility.

[0061] This invention provides a starter voltage establishment control method based on power boundary analysis and compensation. Based on a dynamic voltage establishment method for starters, it clarifies the influence of dynamic components on the voltage establishment process through power analysis, and divides the normal region, first voltage boundary, and second voltage boundary based on mechanism analysis, accurately establishing the dynamic constraints for voltage establishment. Using the first and second voltage boundaries as constraints, current rate compensation is performed on the starter voltage establishment process within a preset safety margin. Taking into account key factors such as current change rate, motor speed, and load characteristics, it can achieve rapid and stable voltage establishment under different operating speeds.

[0062] In one specific embodiment: Input permanent magnet assisted reluctance generator system parameters, including DC bus voltage. u dc Stator resistance R s , d Shaft inductor L d , q Shaft inductor L q Number of motor pole pairs p Electric angular velocity ω e Rated speed n Back potential coefficient ψ f The details are shown in Table 1. .

[0063] Based on permanent magnet assisted reluctance motor dq Voltage equations in the axial reference frame, considering dynamic components and A dynamic voltage constraint equation is constructed. Based on power balance, a Lyapunov function is constructed to analyze the power change during the VBU process, and dynamic coefficients are defined.

[0064] according to And power balance, define VBU boundaries (see Figure 6 ): Normal region (NA): When the power generation exceeds the power consumption, the system is stable, and the bus voltage changes from the back EMF. Rise to the target voltage (270V). Energy changes are as follows: Figure 7 As shown in (a), (d), and (g), the power generation is... Copper consumption The power of the magnetic field change is The remaining power is sufficient to continue supporting the VBU.

[0065] First voltage boundary (FB): Power generation There is no excess energy to support magnetic field absorption; the VBU reaches its limit, but the voltage does not drop. Energy changes are as follows: Figure 7 As shown in (b), (e), and (h), the power generation is Power consumption , .

[0066] Within the first and second voltage boundaries: power changes are as follows Figure 7 As shown in (c), (f), and (i), the power consumed... , Exceeding power generation capacity The bus voltage dropped by 5-6V.

[0067] According to the MIL-STD-704F standard, 270V is used as the reference voltage. The lower limit of the voltage drop is 250V, and the voltage drop ratio is defined. Control signal generation: root and A PWM signal is generated through voltage-current dual-loop control to drive the S / G to achieve fast and stable dynamic voltage establishment. The control strategy block diagram is as follows: Figure 8 As shown.

[0068] In another specific embodiment, a permanent magnet assisted reluctance S / G was used for the experiment, and the parameters are shown in Table 1. To verify the fast and reliable operation capability of the proposed dynamic compensation control method for the VBU, a VBU experiment was conducted using a PI control method at a simulated engine speed of 3000 rpm. The experimental results are as follows. Figure 8 As shown: At 3000 rpm, Under the constraints, both the VBU speed and the VBU's failure rate were guaranteed, as shown in the test results. Figure 9 As shown.

[0069] From the initial back electromotive force At 250 V, the VBU time based on the uncompensated method is 29 ms, such as Figure 9 The voltage curve in (a) is shown. The compensated curve reduces the VBU time to 16.61 ms, as shown in Figure (a). Figure 9 As shown in (b) of the diagram. i q and i d The currents are respectively Figure 9 In the diagram, the black curves (c) and (d) represent the delayed current, which is the uncompensated current. After compensation, the dynamic component... Exceeded These results demonstrate that the proposed compensation control method can ensure stable and fast VBU performance.

[0070] In another specific embodiment, to verify the universality of the method, the verification scope was further expanded. A total of 13 verifications were conducted, with the speed range from 2000 rpm to 5500 rpm, and each 300 rpm increment served as a test point.

[0071] Figure 10 In the graph, the thick curve represents the uncompensated VBU time, and the thin curve represents the compensated VBU time. The compensation effect is significant at low speeds; for example, at 2000 rpm, the VBU time is reduced by 3 ms. At higher speeds, such as 5500 rpm, the time is further reduced by 0.2 ms, demonstrating the effective reduction in time.

[0072] The compensation effect causes the VBU time to decrease as engine speed increases. This is mainly because higher engine speeds result in... The capacity of the VBU is gradually increased, thereby enhancing its capacity. These results validate that the proposed dynamic compensation control method can ensure stable and rapid dynamic VBU performance and optimal VBU timing across the simulated engine speed range.

[0073] Example 2 The present invention also provides a generator voltage establishment control device based on power boundary analysis and compensation, comprising: The current change rate calculation module is used to obtain the current parameters of the generator during the voltage build-up process, and then discretize them to obtain the current time. k The rate of change of current; The dynamic component compensation value calculation module is used to calculate the dynamic component compensation value of the current based on the first voltage boundary and the second voltage boundary, within the preset current safety margin. The maximum current change calculation module is used to calculate the maximum current change in the current cycle based on the current dynamic component compensation value. The reference current value calculation module is used to calculate the reference current value based on the maximum current change. k The rate of change of current at any given time is used for current rate compensation to obtain the compensated reference current value; The compensation module is used to perform current rate compensation on the voltage establishment process of the generator according to the operation command corresponding to the compensated reference current value.

[0074] The present invention provides a generator voltage establishment control device based on power boundary analysis and compensation, which is used to execute a generator voltage establishment control method based on power boundary analysis and compensation as provided in Embodiment 1, and has the same beneficial effects.

[0075] Example 3 The present invention also provides a generator voltage establishment control system based on power boundary analysis and compensation, comprising: a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the method provided in any of the embodiments.

[0076] Example 4 The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the generator voltage establishment control method based on power boundary analysis and compensation as described in any one of Embodiments 1.

[0077] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A generator voltage establishment control method based on power boundary analysis and compensation, characterized in that, include: Obtain the current parameters of the generator during the voltage build-up process, discretize them, and then obtain the current time. k Rate of change of current: , ; in, for d Axis in k The current derivative at time t, for q Axis in k The current derivative at time t, for d The reference current of the axis at time k. for q Axis in k Reference current at time [time] For switching cycles; Based on the first and second voltage boundaries, within the preset current safety margin, the compensation value for the current dynamic component is calculated: , ; in, For the original dynamic components of the q-axis, For the q-axis at k The dynamic component compensation value at time t. This represents the dynamic component compensation value of the d-axis at time k. For compensation coefficient, The value is taken as the value of the first voltage boundary. , As a preset safety margin, ; i q for q shaft current, ψ f The back electromotive force coefficient, L d for d Shaft inductor, L q for q Shaft inductance; and The value is between the value of the first voltage boundary and the value of the second voltage boundary; the first voltage boundary is the voltage value when the power of the magnetic field change and the power generation reach equilibrium during the voltage establishment process of the generator; the second voltage boundary is the voltage value when the power of the magnetic field change and the sum of the capacitor power and the power generation reach equilibrium during the voltage establishment process of the generator. Calculate the maximum current change during the current switching cycle based on the current dynamic component compensation value: , ; Based on the maximum current change k The current rate of change at any given time is used for current rate compensation to obtain the compensated reference current value: ； ； in, i d for d shaft current, The compensated d-axis reference current value. This is the original d-axis reference current value. The compensated q-axis reference current value. This is the original q-axis reference current value; Based on the operation command corresponding to the compensated reference current value, current rate compensation is performed on the voltage establishment process of the generator.

2. The method as described in claim 1, characterized in that, The expression for the compensation value of the current dynamic component is: in, ω e ω is the electric angular velocity.

3. The method as described in claim 2, characterized in that, Also includes: The control parameters of the generator are obtained, and the magnetic field change power, capacitor power and power generation of the generator are calculated based on the control parameters during the voltage establishment process. in, To generate the constantly changing magnetic field energy inside the generator, The rate of change of the magnetic field of the generator. P e To increase the generator's power output, This refers to the capacitor power of the generator.

4. The method as described in claim 3, characterized in that, The expression for when the power of the magnetic field change and the power of the generator reach equilibrium is: ； in, , , , P loss This is for copper consumption.

5. The method as described in claim 3, characterized in that, The expression for the equilibrium between the power of the magnetic field change and the sum of the capacitor power and the power generated is as follows: in, For capacitance, The voltage across the capacitor. This is the derivative of the capacitor voltage.

6. A generator voltage establishment control device based on power boundary analysis and compensation, used to execute the generator voltage establishment control method based on power boundary analysis and compensation as described in any one of claims 1-5, characterized in that, include: The current change rate calculation module is used to obtain the current parameters of the generator during the voltage build-up process, and then discretize them to obtain the current time. k The rate of change of current; The dynamic component compensation value calculation module is used to calculate the dynamic component compensation value of the current based on the first voltage boundary and the second voltage boundary, within the preset current safety margin. The maximum current change calculation module is used to calculate the maximum current change in the current cycle based on the current dynamic component compensation value. The reference current value calculation module is used to calculate the reference current value based on the maximum current change. k The rate of change of current at any given time is used for current rate compensation to obtain the compensated reference current value; The compensation module is used to perform current rate compensation on the voltage establishment process of the generator according to the operation command corresponding to the compensated reference current value.

7. A generator voltage establishment control system based on power boundary analysis and compensation, characterized in that, include: A memory and a processor, the memory storing a computer program, the processor executing the computer program to perform the method provided as claimed in any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the generator voltage establishment control method based on power boundary analysis and compensation as described in any one of claims 1-5.

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