A high-speed generator full-speed range harmonic depth suppression strategy

Abstract

The application discloses a high-speed generator full-speed-domain harmonic depth suppression strategy, and a harmonic problem caused by non-ideal factors such as load nonlinearity and motor tooth slot effect will seriously affect power supply quality of a high-speed generator system, in order to meet high-quality power supply requirements, the application proposes a harmonic suppression regulator. In view of the problem of inaccurate suppression frequency points caused by signal sampling filtering, motor speed fluctuation and the like, the application adopts a wide-band quasi-resonant controller scheme to realize high-speed motor harmonic suppression, and a phase compensation link is added to ensure system stability and improve system phase margin. On this basis, in view of the problem of discrete offset of harmonic suppression frequency points under high-speed working conditions, a frequency pre-correction scheme is proposed, the discrete harmonic suppression frequency points are pre-corrected through a pole matching method, and the depth of harmonic suppression under high-speed working conditions is ensured. The algorithm is simple and universal, and can realize full-speed-domain harmonic depth suppression of the high-speed generator system.

Description

Technical Field

[0001] This invention relates to the field of high-speed generator drive technology, and in particular to a full-speed domain harmonic deep suppression strategy for high-speed generators. Background Technology

[0002] High-speed generator systems, by converting secondary energy into electrical energy, offer significant advantages in improving system efficiency and reliability, and have gradually replaced traditional hydraulic and pneumatic systems, finding widespread application in fields such as aircraft propulsion and electric vehicle manufacturing. With the continuous expansion of power demand, high-quality power supply requirements are being placed on high-speed generator systems. However, due to non-ideal factors such as load nonlinearity and motor cogging effects, harmonic interference causes harmonic pollution in high-speed generator systems, increasing the risk of resonance and thus severely degrading power quality and increasing system losses.

[0003] Traditional resonant controllers are affected by resonant frequency shifts, resulting in limited bandwidth and an inability to effectively suppress harmonics. For example, in weak grid environments or during sudden load changes, the grid fundamental frequency drops from 50Hz to 49.5Hz, causing the fifth harmonic that the harmonic controller aims to suppress to drop from 250Hz to 247.5Hz. Since the harmonic controller uses precise suppression at 250Hz, the gain drops significantly at 247.5Hz, making it unable to suppress the fifth harmonic. Furthermore, traditional discretization schemes also face the problem of discretized resonant frequency shifts under high-speed motor operation.

[0004] Most existing harmonic suppression methods only establish a simplified single-input, single-output model of the motor body, ignoring the coupling small-signal transmission relationship between the sixth harmonic disturbance of the bus voltage and the motor current vector angle, and thus cannot accurately derive the correction transfer function required for disturbance compensation. Furthermore, traditional harmonic compensation structures lack a steady-state point filtering extraction unit, making it impossible to obtain the steady-state reference values ​​of the q-axis current and motor speed under the current operating conditions in real time. The compensation amplitude and phase parameters are fixed, resulting in poor adaptability across wide operating conditions. Publicly available harmonic suppression schemes specifically for electrolytic drive systems suffer from prominent defects such as missing disturbance root cause modeling, limited topology adaptation, and suppression of bus oscillations without eliminating machine-side current harmonics.

[0005] Therefore, for the aforementioned harmonic interference and resonant frequency point offset problems, there is an urgent need for a current vector angle disturbance compensation and harmonic suppression scheme based on a complete small-signal model of the drive system and integrating the steady-state adaptive adjustment of speed and quadrature-axis current. This scheme can cancel the transmission of the sixth harmonic to the motor side from the root cause of bus voltage disturbance, and achieve deep suppression of motor-side current harmonics under all operating conditions. This is to ensure that the high-speed generator system can achieve good power supply in the full frequency domain. In addition, considering the relatively complex characteristics of its control system, the compensation measures adopted must be simple, reliable and easy to implement. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention proposes a full-speed-domain harmonic deep suppression strategy for high-speed generators. Its key feature is that, facing harmonic problems caused by non-ideal factors such as load nonlinearity and motor cogging effect, a quasi-resonant controller with phase compensation is used for harmonic suppression, solving the problem of small resonant suppression bandwidth in traditional solutions. Furthermore, to address the discrete resonant point offset problem of the quasi-resonant controller during harmonic suppression under high-speed conditions, a frequency pre-correction scheme is proposed. This scheme pre-corrects the discrete harmonic suppression frequency points using pole matching, ensuring deep harmonic suppression across all operating conditions.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A full-speed-domain harmonic deep suppression strategy for high-speed generators employs a wideband quasi-resonant controller with phase compensation to form a harmonic suppression regulator. Based on this, a frequency pre-correction scheme based on the pole-matching method is proposed. The discretized harmonic suppression frequency points are pre-corrected using pole matching. The implementation steps of the strategy are as follows: Step S1, check the three-phase current of the high-speed generator. i a , i b , i c Bus voltage u dc Rotor rotation angle i r Sampling is performed, and the three-phase currents are transformed using Park to obtain the dq-axis currents. i d , i q ; Step S2, based on the set value of the bus voltage u dc * With sampled values u dc The dq axis current setpoint is obtained through the voltage regulator. i d * , i q * ; Step S3, rotor rotation angle i r The rotation speed signal was obtained after mathematical processing. n The discrete harmonic suppression frequency point was calculated using the pole matching method. oh o_z The corresponding actual harmonic suppression frequency point oh o ; Step S4, according to the set value of the dq axis current i d * , i q * With sampled values i d , i q The dq-axis voltage setpoint is obtained by a harmonic suppression regulator composed of a broadband quasi-resonant controller with phase compensation. u d * , u q * The harmonic suppression modulator, through oh o Discretize the data; Step S5, set the dq axis voltage value u d * , u q * After mathematical processing, we obtain u α , u β Inverter control is achieved through SVPWM, thereby suppressing harmonics in high-speed generators. SVPWM is a space vector pulse width modulation technique.

[0008] Furthermore, the AC disturbance of 6k times the fundamental frequency that needs to be suppressed in the full speed range of the high-speed generator is caused by the error voltage of the rectifier nonlinearity and the harmonics of the permanent magnet flux linkage. The quasi-resonant controller can effectively suppress the harmonics at low and medium speeds. When the motor speed is greater than 8500 r / min, i.e. high speed operation, the system poles move to the right plane, and a quasi-resonant controller with phase compensation is required.

[0009] Furthermore, in step S2, the voltage regulator can be a PI regulator, a proportional resonant regulator, or a deadbeat controller, with the voltage loop PI proportional coefficient being... k vp The integral coefficient is k vi Based on the fact that the reluctance torque accounts for a relatively small proportion of the total electromagnetic torque of the motor, the d-axis current setting value is... i d * It is 0.

[0010] Furthermore, in step S3, the mathematical processing method is to convert the angle... i r The angular velocity is obtained by differentiating with respect to time. oh rThen the rotational speed is obtained. n The conversion formula for the electric speed n of the motor is as follows: Where p is the number of rotor pole pairs of the high-speed generator. oh r ω is the rotor mechanical angular velocity.

[0011] Furthermore, in step S3, the pole matching method is based on the rotational speed. n Calculate the fundamental angular frequency oh e This leads to the discrete angular frequency points corresponding to six times the fundamental angular frequency. oh o_z The ideal harmonic suppression frequency point of the quasi-resonant controller oh o The actual frequency corresponding to the pole angle oh o_z By performing precise matching and transforming and inversely transforming the two formulas, the discrete harmonic suppression frequency point is obtained. oh o_z Corresponding ideal harmonic suppression frequency oh o And the ideal harmonic suppression frequency point oh o The frequency point input parameter of the controller's discrete formula is adjusted to achieve pre-correction of the discrete harmonic suppression frequency point under high-speed operating conditions.

[0012] Furthermore, in step S4, the discretization methods include bilinear transform, forward Euler method, backward Euler method, and zero-order preservation method. The discretization method used here is the bilinear transform, and its transformation formula is: in T s The sampling period.

[0013] Furthermore, in step S4, the harmonic suppression regulator mentioned in S4 is a quasi-resonant controller, and its transfer function is: in, oh c The cutoff angular frequency of the quasi-resonant controller, oh o The ideal harmonic suppression frequency point, k r This represents the gain of the resonant controller.

[0014] Furthermore, in step S4, the harmonic suppression regulator mentioned in S4 is a quasi-resonant controller, and a phase compensation stage is added to it. After adding the phase compensation angle, the expression is simplified as follows: in, For phase compensation angle, k r For the resonant controller gain, oh c This is the cutoff angular frequency of the resonant controller. oh o This is the resonant angular frequency of the resonant controller.

[0015] Furthermore, in step S4, the harmonic suppression regulator, after discretization, has the following expression:

[0016] in, T s The sampling period is k r For the resonant controller gain, oh c This is the cutoff angular frequency of the resonant controller. oh o This is the resonant angular frequency of the resonant controller.

[0017] Furthermore, in step S5, the dq axis voltage setting value is... u d * , u q * After mathematical processing, it is transformed into u α , u β The mathematical processing involves an inverse Park transform, and the SVPWM is a space vector pulse width modulation technique. This technique is used to... u α , u β It is converted into an inverter switching signal.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention provides a full-speed domain harmonic deep suppression strategy for high-speed generators. The harmonic suppression regulator used has improved bandwidth based on the traditional resonant controller. When the harmonic frequency point is offset (caused by non-ideal factors such as sampling filtering and motor speed fluctuation), it can effectively suppress harmonics.

[0019] 2. The present invention provides a full-speed domain harmonic deep suppression strategy for high-speed generators. The harmonic suppression regulator used adds a phase compensation stage to the traditional quasi-resonant controller to ensure system stability and effectively improve the phase margin.

[0020] 3. The present invention provides a full-speed domain harmonic deep suppression strategy for high-speed generators. The pole matching method used can achieve accurate correction of discrete resonant frequency points, ensuring deep suppression of harmonics in the full-speed domain of the high-speed generator system.

[0021] 4. The present invention provides a full-speed domain harmonic deep suppression strategy for high-speed generators, which realizes the decoupling coordination and synergistic optimization of frequency tracking and discrete correction in the process of harmonic suppression of high-speed generators. It avoids the problem of mutual restraint of control channels caused by frequency offset and discrete error in traditional control schemes. Under typical non-ideal operating conditions such as load nonlinearity, motor cogging effect, and large speed fluctuation, the system can still maintain a small regulation overshoot and a short response time. At the same time, it significantly reduces the harmonic content of generator output, and improves the dynamic response capability, robustness and power quality level of high-speed generator system. Attached Figure Description

[0022] Figure 1 A flowchart of a full-speed domain harmonic deep suppression strategy for a high-speed generator; Figure 2 The amplitude-frequency response diagram of the resonant controller; Figure 3 The amplitude-frequency response diagram of the broadband quasi-resonant controller; Figure 4 The phase frequency response diagram of the system before the introduction of phase compensation; Figure 5 The phase frequency response diagram of the system after introducing the phase compensation stage; Figure 6 The effect diagram of frequency shift before and after discretization; Figure 7 The diagram shows the pre-correction effect of the resonant frequency points before and after discretization. Detailed Implementation

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings: This invention can be implemented in many different forms and should not be considered as limited to the embodiments described herein. Rather, these embodiments are provided so that the contents of this invention will be thoroughly and completely disclosed to those skilled in the art, and will fully express the scope of the invention.

[0024] This invention discloses a full-speed-domain harmonic deep suppression strategy for high-speed generators. Harmonic problems caused by non-ideal factors such as load nonlinearity and motor cogging effect will seriously affect the power supply quality of high-speed generator systems. To meet the high-quality power supply requirements, this invention proposes a quasi-resonant controller with phase compensation for harmonic suppression, solving the problem of small harmonic suppression bandwidth in traditional schemes. Based on this, addressing the discrete resonance point offset problem in the harmonic suppression process under high-speed conditions, a frequency pre-correction scheme is proposed. This scheme pre-corrects the discrete harmonic suppression frequency points using pole matching, ensuring deep harmonic suppression under high-speed conditions. The algorithm is simple to implement and has universality, achieving full-speed-domain harmonic deep suppression for high-speed generator systems. The implementation steps of the scheme are as follows: Step S1, check the three-phase current of the high-speed generator. i a , i b , i c Bus voltage u dc Rotor rotation angle i r Sampling is performed, and the three-phase currents are mathematically processed to obtain the dq-axis currents. i d , i q ; Step S2, based on the set value of the bus voltage u dc * With sampled values u dc The dq axis current setpoint is obtained through the voltage regulator. i d * , i q * ; Step S3, rotor rotation angle i r The rotation speed signal was obtained after mathematical processing. n The discrete harmonic suppression frequency point was calculated using the pole matching method. oh o_z Corresponding ideal harmonic suppression frequency oh o ; Step S4, according to the set value of the dq axis current i d * , i q * With sampled values i d, i q The dq axis voltage setpoint is obtained after passing through the harmonic suppression regulator. u d * , u q * The harmonic suppression modulator, through oh o Discretize the data.

[0025] Step S5, set the dq axis voltage value u d * , u q * After mathematical processing, we obtain u α , u β Inverter control is achieved through Space Vector Pulse Width Modulation (SVPWM) technology, thereby suppressing harmonics in high-speed generators and achieving high-quality power supply.

[0026] Furthermore, according to claim 1, the full-speed domain harmonic deep suppression strategy for a high-speed generator is characterized in that the 6k-fold fundamental frequency AC disturbance to be suppressed in the full-speed domain of the high-speed generator is caused by the error voltage resulting from the nonlinearity of the rectifier and the harmonics of the permanent magnet flux linkage. At low and medium speeds, a quasi-resonant controller can effectively suppress the harmonics. When the motor speed is greater than 8500 r / min, i.e., at high speed, the system poles move to the right plane, and a quasi-resonant controller with phase compensation is required.

[0027] Furthermore, in step S2, the voltage regulator can be a PI regulator, a proportional resonant regulator, or a deadbeat controller, with the voltage loop PI proportional coefficient being... k vp The integral coefficient is k vi Based on the fact that the reluctance torque accounts for a relatively small proportion of the total electromagnetic torque of the motor, the d-axis current setting value is... i d * It is 0.

[0028] Furthermore, in step S3, the mathematical processing method is to convert the angle... i r The angular velocity is obtained by differentiating with respect to time. oh r Then the rotational speed is obtained. n Motor speed n The conversion formula is as follows: in p This represents the number of rotor pole pairs in a high-speed generator. oh r ω is the rotor mechanical angular velocity.

[0029] Furthermore, in step S3, the pole matching method is based on the rotational speed. n Calculate the fundamental angular frequency oh e This leads to the discrete angular frequency points corresponding to six times the fundamental angular frequency. oh o_z The ideal harmonic suppression frequency point of the quasi-resonant controller oh o The actual frequency corresponding to the pole angle oh o_z By performing precise matching and transforming and inversely transforming the two formulas, the discrete harmonic suppression frequency point is obtained. oh o_z Corresponding ideal harmonic suppression frequency oh o And the ideal harmonic suppression frequency point oh o The frequency point input parameter of the controller's discrete formula is adjusted to achieve pre-correction of the discrete harmonic suppression frequency point under high-speed operating conditions.

[0030] Furthermore, in step S4, the discretization methods include bilinear transform, forward Euler method, backward Euler method, and zero-order preservation method. The discretization method used here is the bilinear transform, and its transformation formula is: in T s The sampling period.

[0031] Furthermore, in step S4, the harmonic suppression regulator mentioned in S4 is a quasi-resonant controller, and its transfer function is: in, oh c The cutoff angular frequency of the quasi-resonant controller, oh o The ideal harmonic suppression frequency point, k r This represents the gain of the resonant controller.

[0032] Furthermore, in step S4, the harmonic suppression regulator mentioned in S4 is a quasi-resonant controller, and a phase compensation stage is added to it. After adding the phase compensation angle, the expression is simplified as follows: in, For phase compensation angle, k r For the resonant controller gain, oh c This is the cutoff angular frequency of the resonant controller. oh o This is the resonant angular frequency of the resonant controller.

[0033] Furthermore, in step S4, the harmonic suppression regulator, after discretization, has the following expression: in, T s The sampling period is k r For the resonant controller gain, oh c This is the cutoff angular frequency of the resonant controller. oh o This is the resonant angular frequency of the resonant controller.

[0034] Furthermore, in step S5, the dq axis voltage setting value is... u d * , u q * After mathematical processing, it is transformed into u α , u β The mathematical processing involves an inverse Park transform, and the SVPWM is a space vector pulse width modulation technique. This technique is used to... u α , u β It is converted into an inverter switching signal to achieve harmonic suppression.

[0035] Furthermore, in combination Figure 1The following details the specific process of a high-speed generator full-speed domain harmonic deep suppression strategy based on a harmonic suppression regulator. The 6k-fold fundamental frequency AC disturbance to be suppressed across the entire speed domain of the high-speed generator is caused by error voltage due to rectifier nonlinearity and permanent magnet flux harmonics. While traditional resonant controllers can suppress harmonic signals at specific resonant angular frequencies at low and medium speeds, their suppression bandwidth is too small. This prevents precise suppression of harmonic frequencies when there is a deviation between the actual motor harmonic frequency and the acquired harmonic frequency. Therefore, a quasi-resonant controller is used to replace the traditional resonant controller, such as... Figure 2 , Figure 3 As shown, compared with the traditional resonant controller, the quasi-resonant controller effectively increases the harmonic suppression bandwidth and reduces the impact of frequency offset. The transfer function of the quasi-resonant controller is:

[0036] oh c The cutoff angular frequency of the quasi-resonant controller, oh o The ideal harmonic suppression frequency is set to six times the fundamental angular frequency. oh e , oh e From rotational speed n Determined by the extreme logarithm, k r For the resonant controller gain, k r Increasing the current loop's ability to suppress disturbances at the resonant frequency will improve its performance, but it will also increase the resonant peak value of the closed-loop transfer function, reducing dynamic performance. To balance the system's dynamic performance and harmonic suppression performance, a resonant gain value of kr = 100 is chosen. Cutoff angular frequency. oh c Typically much lower than the ideal harmonic suppression frequency. oh o And with oh c Increased size enhances the controller's suppression capability.

[0037] When the generator speed increases to above 8500 r / min (i.e., high-speed operation), control delay causes phase lag, and the system poles move to the right plane. The phase margin of the quasi-resonant controller deteriorates with increasing speed, and may even lead to negative crossover, causing system instability. Therefore, it is necessary to compensate the phase angle of the quasi-resonant controller to improve the phase margin. After adding the phase compensation angle, the expression is simplified as follows:

[0038] The phase compensation angle is calculated using the following formula: This is the delay time, with a value of 1.5. T s By incorporating phase compensation, the phase margin can be effectively improved, such as... Figure 4 , Figure 5 As shown. To enable the quasi-resonant controller with phase compensation to be applied in practical digital control, the continuous domain needs to be discretized. The discretized expression is shown below:

[0039] T s Given the sampling period, the poles are obtained from the expression as follows:

[0040] By performing absolute value operations and inverse transformations on the real and virtual axes, the actual harmonic suppression frequency of the discrete quasi-resonant controller with phase compensation is obtained. oh o_z for:

[0041] Ignoring higher-order infinitesimals, according to Find the ideal harmonic suppression frequency. oh o The expression is:

[0042] oh o_z The discretized actual harmonic suppression frequency point is shown in the expression. It can be seen that the discretized harmonic suppression frequency point deviates from the ideal harmonic suppression frequency point. When the motor operates at high speed, the frequency deviation is significant. To correct the discretized harmonic suppression frequency point, the rotor rotation angle is first sampled. i r The rotational speed is obtained after conversion. n Multiplying this by the gain yields the electric angular velocity, which is then multiplied by six to find the discretized harmonic suppression frequency point six times the fundamental frequency. oh o_z * Then, the corresponding ideal harmonic suppression frequency point is obtained according to formula (6). oh o Let it be used as the formula in (3) oh o Input value, based on Figure 6 , Figure 7 This demonstrates that by using this pre-correction method to obtain the ideal discrete harmonic suppression frequency point, the problem of the offset of the discrete harmonic suppression frequency point is solved.

[0043] The discretized and pre-corrected quasi-resonant controller with phase compensation is connected in parallel to the current regulator. First, the actual value and set value of the bus voltage are sampled, and the output of the voltage regulator is adjusted to the q-axis current set value. i q * d-axis current i d * The input setting is 0, and the three-phase current is sampled from the generator output terminal. i abc After undergoing a dq coordinate transformation, it is used as the dq-axis current. i dq The actual value input is processed by a discretized quasi-resonant controller with phase compensation and a current regulator, and the output is the ideal dq-axis voltage. u dq * After performing an inverse Park transformation on the voltage, the inverter's switching is controlled by space vector pulse width modulation technology, thereby regulating the bus voltage and ultimately achieving full-frequency harmonic suppression.

[0044] Simulation results show that when the motor operates at a low to medium speed (6000 r / min), compared to a traditional harmonic suppressor, the discrete quasi-resonant controller can reduce the fifth harmonic from 5.28% to 0.83%, the seventh harmonic from 4.19% to 0.55%, and the total harmonic distortion (THD) from 8.27% to 4.96%; the suppression ratios for the fifth and seventh harmonics are 84.5% and 86.6%, respectively. However, when the motor speed increases to 9000 r / min, reaching high-speed operation, the current loop becomes unstable under the action of the quasi-resonant controller due to the low phase margin, resulting in extremely high THD content in the phase current, necessitating discrete harmonic frequency pre-correction. When the motor speed reaches 12000 r / min, the pre-corrected discrete quasi-resonant controller can reduce the fifth harmonic from 3.96% to 0.63%, the seventh harmonic from 2.43% to 0.39%, and the THD from 10.35% to 9.23%. The fifth and seventh harmonic suppression ratios were 84.1% and 84.0%, respectively, thus proving that the pre-corrected discrete quasi-resonant controller still has a good harmonic suppression effect under high-speed motor conditions.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A full-speed domain harmonic depth suppression strategy for high-speed generators, characterized in that, This invention employs a broadband quasi-resonant controller with phase compensation to construct a harmonic suppression regulator. Based on this, a frequency pre-correction scheme based on the pole-matching method is proposed. The discretized harmonic suppression frequency points are pre-corrected using pole matching. The implementation steps of this strategy are as follows: Step S1, check the three-phase current of the high-speed generator. i a , i b , i c Bus voltage u dc Rotor rotation angle θ r Sampling is performed, and the three-phase currents are transformed using Park to obtain the dq-axis currents. i d , i q ; Step S2, based on the set value of the bus voltage u dc * With sampled values u dc The dq axis current setpoint is obtained through the voltage regulator. i d * , i q * ; Step S3, rotor rotation angle θ r The rotational speed signal was obtained after mathematical processing. n The discrete harmonic suppression frequency point was calculated using the pole matching method. ω o_z The corresponding actual harmonic suppression frequency point ω o ; Step S4, according to the set value of the dq axis current i d * , i q * With sampled values i d , i q The dq-axis voltage setpoint is obtained by a harmonic suppression regulator composed of a broadband quasi-resonant controller with phase compensation. u d * , u q * The harmonic suppression modulator, through ω o Discretize the data; Step S5, set the dq axis voltage value u d * , u q * After mathematical processing, we obtain u α , u β Inverter control is achieved through SVPWM, thereby suppressing harmonics in high-speed generators. SVPWM is a space vector pulse width modulation technique.

2. The high-speed generator full-speed domain harmonic depth suppression strategy according to claim 1, characterized in that, The AC disturbance of 6k times the fundamental frequency that needs to be suppressed in the full speed range of a high-speed generator is caused by the error voltage of the rectifier nonlinearity and the harmonics of the permanent magnet flux linkage. The quasi-resonant controller can effectively suppress the harmonics at low and medium speeds. When the motor speed is greater than 8500 r / min, i.e. high speed operation, the system poles move to the right plane, and a quasi-resonant controller with phase compensation is required.

3. The high-speed generator full-speed domain harmonic depth suppression strategy according to claim 1, characterized in that, In step S2, the voltage regulator can be a PI regulator, a proportional resonant regulator, or a deadbeat controller, with the voltage loop PI proportional coefficient being... k vp The integral coefficient is k vi Based on the fact that the reluctance torque accounts for a relatively small proportion of the total electromagnetic torque of the motor, the d-axis current setting value is... i d * It is 0.

4. The high-speed generator full-speed domain harmonic depth suppression strategy according to claim 1, characterized in that, In step S3, the mathematical processing method is to adjust the angle. θ r The angular velocity is obtained by differentiating with respect to time. ω r Then the rotational speed is obtained. n The conversion formula for the electric speed n of the motor is as follows: Where p is the number of rotor pole pairs of the high-speed generator. ω r ω is the rotor mechanical angular velocity.

5. The high-speed generator full-speed domain harmonic depth suppression strategy according to claim 1, characterized in that, In step S3, the pole matching method is based on the rotational speed. n Calculate the fundamental angular frequency ω e This leads to the discrete angular frequency points corresponding to six times the fundamental angular frequency. ω o_z The ideal harmonic suppression frequency point of the quasi-resonant controller ω o The actual frequency corresponding to the pole angle ω o_z By performing precise matching and transforming and inversely transforming the two formulas, the discrete harmonic suppression frequency point is obtained. ω o_z Corresponding ideal harmonic suppression frequency ω o And the ideal harmonic suppression frequency point ω o The frequency point input parameter of the controller's discrete formula is adjusted to achieve pre-correction of the discrete harmonic suppression frequency point under high-speed operating conditions.

6. The high-speed generator full-speed domain harmonic depth suppression strategy according to claim 1, characterized in that, In step S4, the discretization methods include bilinear transform, forward Euler method, backward Euler method, and zero-order preservation method. The discretization method used here is the bilinear transform, and its transformation formula is: in T s The sampling period.

7. The high-speed generator full-speed domain harmonic depth suppression strategy according to claim 1, characterized in that, In step S4, the harmonic suppression regulator mentioned in S4 is a quasi-resonant controller, and its transfer function is: in, ω c The cutoff angular frequency of the quasi-resonant controller, ω o The ideal harmonic suppression frequency point, k r This represents the gain of the resonant controller.

8. The full-speed domain harmonic depth suppression strategy for a high-speed generator according to claim 1, characterized in that, In step S4, the harmonic suppression regulator mentioned in S4 is a quasi-resonant controller, and a phase compensation stage is added to it. After adding the phase compensation angle, the expression is simplified as follows: in, For phase compensation angle, k r For the resonant controller gain, ω c This is the cutoff angular frequency of the resonant controller. ω o This is the resonant angular frequency of the resonant controller.

9. The high-speed generator full-speed domain harmonic depth suppression strategy according to claim 1, characterized in that, In step S4, the harmonic suppression modulator, after discretization, has the following expression: in, T s The sampling period is k r For the resonant controller gain, ω c This is the cutoff angular frequency of the resonant controller. ω o This is the resonant angular frequency of the resonant controller.

10. A high-speed generator full-speed domain harmonic depth suppression strategy according to claim 1, characterized in that, In step S5, the dq axis voltage setting value is... u d * , u q * After mathematical processing, it is transformed into u α , u β The mathematical processing involves an inverse Park transform, and the SVPWM is a space vector pulse width modulation technique. This technique is used to... u α , u β It is converted into an inverter switching signal.

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