A bus voltage fluctuation suppression system and method based on voltage ANF quadrature phase shift compensation

Abstract

The application relates to the technical field of electric energy conversion and control, and provides a bus voltage fluctuation suppression system and method based on voltage ANF orthogonal phase shift compensation, which comprises a direct current bus, a common direct current bus open-winding power converter electrically connected with the direct current bus, a direct current bias type Vernier magneto generator electrically connected with the common direct current bus open-winding power converter, and a control loop; the control loop comprises a voltage self-adaptive notch filter detection module, a 0-axis current self-adaptive notch filter controller, a current distribution module, a dq-axis current regulator, a rotating / static coordinate conversion module, a pulse width modulation module and a voltage / current signal processing module. The application has the effects of improving the bus voltage quality and the operation stability of a power generation loop.

Description

Technical Field

[0001] This invention relates to the technical field of power conversion and control, specifically to a bus voltage fluctuation suppression system and method based on voltage ANF quadrature phase shift compensation. Background Technology

[0002] DC-biased vernier reluctance generators (DC-VRGs) typically require a power converter in their generation circuit to convert the generator-side electrical energy and feed it into the DC bus to supply power to downstream DC loads or the inverter stage. In such systems, the DC bus voltage not only experiences ripple caused by load power fluctuations, switching actions, and parameter dispersion, but may also be superimposed with low-order harmonic fluctuations introduced by zero-sequence loops, modulation strategies, and generator-side electromagnetic characteristics. One common engineering manifestation is the presence of a significant third harmonic component in the DC bus voltage. Third harmonic voltage fluctuations increase the DC bus capacitor ripple current, increase the voltage stress on power devices, and further affect the voltage stability and overall operational reliability of downstream stages. Especially in scenarios where the open-winding power converter on the common DC bus and the three-phase windings of the motor form a zero-sequence current path that can inject zero-sequence harmonic current, the existence of zero-sequence loops makes the harmonic coupling path more complex. Without targeted extraction and phase-matching compensation for the third harmonic of the DC bus, it is often difficult to stably and continuously reduce the third harmonic fluctuation of the DC bus voltage under multiple operating conditions.

[0003] Current technology discloses a "harmonic suppression control method for a common-bus open-winding permanent magnet synchronous motor," which reduces the third harmonic content of the phase current through modulation strategies and zero-sequence current closed-loop control, aiming to reduce vibration. This scheme focuses on the control design around the current harmonics and zero-sequence current suppression of the open-winding common-bus drive system, and combines space voltage pulse width modulation strategies to reduce harmonics. While this technology can reduce motor-side current harmonics and the resulting vibration to some extent, its control target and observation object mainly focus on motor-side current harmonics and zero-sequence current. It does not provide a systematic implementation method for the closed-loop suppression link that "uses the DC bus voltage as the observation object, extracts the third harmonic component of the DC bus voltage in a directional manner, generates a compensation current that satisfies a preset orthogonal phase shift relationship, and then injects it through the 0-axis loop to form a compensation voltage component on the DC bus side to cancel out the original third harmonic voltage fluctuation." Furthermore, the compensation phase matching and robustness remain insufficient under the conditions of third harmonic amplitude and phase changes caused by different speeds / loads.

[0004] Another technology discloses a control system for "DC bus voltage harmonic reduction," which separates voltage components and calculates a reference current accordingly to control the three-phase power converter and improve the DC bus voltage harmonic performance at the DC link. This type of technology focuses on harmonic reduction and voltage regulation of the DC link bus voltage, generally targeting the voltage regulation and reference current generation of the three-phase power converter and its control system. However, for scenarios involving a zero-sequence current path formed by a common DC bus open-winding power converter and motor windings, it does not establish a dedicated 0-axis compensation link around the "zero-sequence harmonic current injection path," nor does it address the key mechanisms of extracting the third harmonic component from the DC bus voltage, constructing the quadrature phase-shift compensation current, and the closed-loop tracking of the third harmonic quadrature component of the zero-sequence current by the 0-axis current adaptive notch filter controller. Therefore, in the application of DC-biased vernier reluctance generators, it is difficult to simultaneously achieve third harmonic suppression and multi-condition stability.

[0005] Based on the aforementioned technological status, the problem to be solved by this invention can be summarized as follows: In a power generation circuit consisting of a DC-biased vernier reluctance generator and a common DC bus open-winding power converter, when the DC bus voltage exhibits third harmonic fluctuations that vary with operating conditions, how can the third harmonic component be stably and in real-time extracted from the DC bus voltage without adding additional complex hardware, using the DC bus voltage as the direct observation object, and how can an orthogonal phase-shifting compensation current setpoint satisfying a preset orthogonal phase-shifting relationship be constructed? Furthermore, a closed-loop tracking is formed by a zero-axis current adaptive notch filter controller and zero-sequence current feedback, enabling the compensation current to be accurately injected through the zero-sequence current path, thereby forming a compensation voltage component on the DC bus side that cancels out the original third harmonic voltage fluctuations, achieving reliable suppression of the third harmonic fluctuations of the DC bus voltage, and meeting the stability and engineering feasibility requirements under multiple operating conditions. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned shortcomings by proposing a bus voltage fluctuation suppression system and method based on voltage ANF quadrature phase shift compensation.

[0007] The present invention adopts the following technical solution:

[0008] A bus voltage fluctuation suppression system based on voltage ANF quadrature phase shift compensation is applied to the power generation circuit of a DC biased vernier reluctance generator, including a DC bus, a common DC bus open-winding power converter electrically connected to the DC bus, a DC biased vernier reluctance generator electrically connected to the common DC bus open-winding power converter, and a control circuit.

[0009] The control loop includes at least: a voltage adaptive notch filter detection module, a zero-axis current adaptive notch filter controller, and a pulse width modulation module; wherein, the voltage adaptive notch filter detection module is used to extract the third harmonic component of the DC bus voltage and output the quadrature phase-shift compensation current given corresponding to the third harmonic component; the zero-axis current adaptive notch filter controller is used to generate a zero-axis voltage compensation signal based on the quadrature phase-shift compensation current given and zero-sequence current feedback; the pulse width modulation module is used to generate a pulse width modulation drive signal to drive the common DC bus open winding power converter based on the zero-axis voltage compensation signal, so as to suppress the third harmonic fluctuation of the DC bus voltage.

[0010] Optionally, the common DC bus open winding power converter includes two sets of three-phase converters connected to the same DC bus, and the three-phase windings of the DC biased vernier reluctance generator are respectively connected to the two sets of three-phase converters to form a zero-sequence current path into which zero-sequence harmonic current can be injected.

[0011] Optionally, the quadrature phase-shifting compensation current given by the voltage adaptive notch filter detection module includes a cosine component and a sine component of the third harmonic compensation current, and the cosine component and the sine component are combined to form the equivalent third harmonic compensation current given to be injected into the 0-axis loop.

[0012] Optionally, the phase of the equivalent third harmonic compensation current is given relative to the third harmonic component of the DC bus voltage, satisfying a preset orthogonal phase shift relationship, so that the compensation voltage component formed by the compensation current on the DC bus side is used to cancel out the original third harmonic voltage fluctuation of the DC bus.

[0013] Optionally, the 0-axis current adaptive notch filter controller is used to extract the static component and the third harmonic quadrature component of the zero-sequence current and output the 0-axis voltage compensation signal; by adjusting the 0-axis voltage compensation signal, the zero-sequence current tracks the quadrature phase-shift compensation current, so as to realize the linkage compensation of the voltage adaptive notch filter and the 0-axis current adaptive notch filter.

[0014] Optionally, the control loop further includes: a current distribution module, a dq-axis current regulator, a rotation / stationary coordinate transformation module, and a voltage / current signal processing module;

[0015] The current distribution module combines the DC component adjustment requirement with the quadrature phase shift compensation requirement and outputs the dq0-axis current setpoint; the dq-axis current regulator outputs the dq0-axis voltage setpoint based on the dq0-axis current setpoint and dq0-axis current feedback; the rotating / stationary coordinate transformation module transforms the dq0-axis voltage setpoint to a voltage setpoint in a stationary coordinate system; the pulse width modulation module generates a PWM drive signal to drive the common DC bus open winding power converter based on the voltage setpoint in the stationary coordinate system; and the voltage / current signal processing module forms DC bus voltage feedback and dq0-axis current feedback to constitute a closed-loop control that suppresses the third harmonic fluctuation of the bus voltage.

[0016] Optionally, the current distribution module adopts a maximum torque per ampere current distribution strategy, combining the DC component adjustment requirement with the quadrature phase shift compensation requirement, and outputs the dq0 axis current setpoint.

[0017] Optionally, the dq-axis current regulator outputs a dq-axis voltage command signal, and superimposes the 0-axis voltage compensation signal with the DC component adjustment signal to obtain a 0-axis voltage command signal; the rotation / stationary coordinate transformation module transforms the dq0-axis voltage command to a voltage command in the stationary coordinate system based on electrical angle feedback; the pulse width modulation module performs space vector pulse width modulation on the voltage command in the stationary coordinate system to generate a PWM drive signal.

[0018] A bus voltage fluctuation suppression method based on voltage ANF quadrature phase shift compensation is applied to the bus voltage fluctuation suppression system based on voltage ANF quadrature phase shift compensation. The bus voltage fluctuation suppression method based on voltage ANF quadrature phase shift compensation includes:

[0019] S1 extracts the third harmonic component of the DC bus voltage and outputs the quadrature phase-shifting compensation current corresponding to the third harmonic component.

[0020] S2, Based on the quadrature phase-shifting compensation current given and the zero-sequence current feedback, a zero-axis voltage compensation signal is generated;

[0021] S3 combines the DC component adjustment requirement with the quadrature phase shift compensation requirement and outputs the dq0 axis current command.

[0022] S4, based on the given dq0 axis current and the feedback of the dq0 axis current, outputs the given dq0 axis voltage;

[0023] S5, transform the voltage reference of the dq0 axis to the voltage reference in the stationary coordinate system;

[0024] S6, Generate a PWM drive signal to drive the common DC bus open winding power converter based on the voltage given in the stationary coordinate system;

[0025] S7 forms DC bus voltage feedback and dq0 axis current feedback to form a closed-loop control that suppresses the third harmonic fluctuation of the bus voltage.

[0026] The beneficial effects achieved by this invention are:

[0027] 1. By setting up a DC bus, a common DC bus open-winding power converter, a DC biased vernier reluctance generator, and a control loop consisting of a voltage adaptive notch filter detection module, a 0-axis current adaptive notch filter controller, a current distribution module, a dq-axis current regulator, a rotating / stationary coordinate transformation module, a pulse width modulation module, and a voltage / current signal processing module, the voltage adaptive notch filter detection module can extract the third harmonic component of the DC bus voltage and output an orthogonal phase-shifting compensation current command. The 0-axis current adaptive notch filter controller can, based on the positive... The phase-shifting compensation current setpoint and zero-sequence current feedback generate the 0-axis voltage compensation signal, which is then used by the current distribution module and the dq-axis current regulator to form the dq0-axis current setpoint and dq0-axis voltage setpoint. These signals are then used by the rotating / stationary coordinate transformation module and the pulse width modulation module to generate the PWM drive signal for the common DC bus open winding power converter. This forms a closed-loop control link based on DC bus voltage feedback and dq0-axis current feedback, enabling real-time identification, real-time compensation, and closed-loop suppression of the third harmonic fluctuation of the DC bus voltage, thereby improving the bus voltage quality and the operational stability of the generator circuit.

[0028] 2. By setting the common DC bus open-winding power converter as two sets of three-phase converters connected to the same DC bus, and connecting the three-phase windings of the DC biased vernier reluctance generator to the two sets of three-phase converters respectively, a zero-sequence current path for injecting zero-sequence harmonic current is formed. This allows the 0-axis voltage compensation signal to have a clear execution path in structure, and the compensation current can be effectively injected to form a controllable compensation voltage component on the DC bus side. This reduces the risk of "no path for injection" or "insufficient injection" in the actual hardware structure of the compensation strategy, improves the feasibility and engineering implementation of third harmonic compensation, and enhances the compensation capability and stability of the system under different operating conditions.

[0029] 3. By making the quadrature phase-shifting compensation current given by the voltage adaptive notch filter detection module include the cosine component and sine component of the third harmonic compensation current, and combining the cosine component and sine component to form the equivalent third harmonic compensation current given to be injected into the 0-axis loop, the third harmonic compensation is upgraded from a "single amplitude quantity" to a "quadrature component controllable vector quantity". It can simultaneously adjust the amplitude and phase of the compensation current independently, thereby more accurately matching the amplitude and phase characteristics of the third harmonic component of the DC bus voltage, improving the accuracy and adjustable range of the compensation current construction, and thus improving the suppression depth and convergence speed of the third harmonic fluctuation of the bus.

[0030] 4. By limiting the phase of the equivalent third harmonic compensation current to satisfy the preset orthogonal phase shift relationship with the third harmonic component of the DC bus voltage, the compensation voltage component formed by the compensation current on the DC bus side has a phase cancellation relationship with the original third harmonic voltage fluctuation of the DC bus. This transforms the third harmonic suppression mechanism from "amplitude reduction" to "phase cancellation dominance". It can significantly improve the cancellation efficiency while keeping the compensation current controllable, reduce the dependence on excessive compensation current, reduce the risk of additional current stress and loss caused by compensation, and enhance the suppression consistency and robustness under parameter disturbance or load fluctuation conditions.

[0031] 5. By using the 0-axis current adaptive notch filter controller to extract the static component and the third harmonic quadrature component of the zero-sequence current and output the 0-axis voltage compensation signal, and by adjusting the 0-axis voltage compensation signal to make the zero-sequence current track the quadrature phase-shift compensation current, the linkage compensation of the voltage adaptive notch filter and the 0-axis current adaptive notch filter is realized. This extends the compensation strategy from "voltage-side given generation" to "current-side execution tracking" closed-loop consistency control, which can suppress the tracking error caused by changes in zero-sequence path parameters, non-ideal execution side or disturbances, reduce the compensation phase and compensation amplitude deviation, improve the real-time performance and accuracy of compensation injection, and thus improve the stability and repeatability of the third harmonic fluctuation suppression of the bus.

[0032] 6. By employing a maximum torque per ampere current distribution strategy in the current distribution module, the DC component regulation requirements and the quadrature phase shift compensation requirements are combined and the dq0 axis current setpoint is output. This allows the DC component regulation of the DC bus voltage and the suppression of third harmonic fluctuations to be coordinated within the same current setpoint system. Under current constraints, this prioritizes the effective torque output and basic power generation control requirements. At the same time, it leaves a controllable current distribution space for quadrature phase shift compensation, reduces the risk of mutual conflicts and coupled oscillations between different control objectives, improves the system's control efficiency and energy utilization under multi-objective constraints, and enhances the control stability margin when operating conditions change.

[0033] 7. By having the dq-axis current regulator output the dq-axis voltage setpoint signal, and superimposing the 0-axis voltage compensation signal with the DC component adjustment signal to obtain the 0-axis voltage setpoint signal, the rotation / stationary coordinate transformation module transforms the dq0-axis voltage setpoint to the voltage setpoint in the stationary coordinate system based on electrical angle feedback. The pulse width modulation module performs space vector pulse width modulation on the voltage setpoint in the stationary coordinate system to generate a PWM drive signal. This allows the 0-axis compensation injection and the d-axis and q-axis current regulation to be superimposed and coordinated under a unified voltage setpoint and modulation output framework. This reduces the probability of the compensation signal being weakened or mismatched during the execution stage, improves the execution accuracy and dynamic response speed of the compensation injection, and enhances the voltage utilization and modulation linearity through space vector pulse width modulation. This further improves the suppression effect of the third harmonic fluctuation of the DC bus voltage and enhances the overall system operation stability.

[0034] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the equivalent structure of the power generation circuit of the DC biased vernier reluctance generator in this invention.

[0036] Figure 2 This is a schematic diagram of the topology of the DC bus open winding power converter of the present invention;

[0037] Figure 3 This is a schematic diagram showing the phase relationship between the third harmonic voltage and the injected harmonic current in this invention;

[0038] Figure 4 This is a block diagram of the quadrature phase-shift compensation generation of the voltage adaptive notch filter detection module in this invention;

[0039] Figure 5 This is a compensation tracking block diagram of the 0-axis current adaptive notch filter controller in this invention;

[0040] Figure 6 This is the overall closed-loop control block diagram of the bus voltage fluctuation suppression system in this invention;

[0041] Figure 7 This is a schematic diagram of the method flow for a bus voltage fluctuation suppression method based on voltage ANF quadrature phase shift compensation in this invention.

[0042] Figure 8 This is a heat map showing the statistical effect of the third harmonic suppression improvement in this invention. Detailed Implementation

[0043] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention. Furthermore, the accompanying drawings of the present invention are for simple illustrative purposes only and are not depictions of actual dimensions; this is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of protection of the present invention.

[0044] Example 1: This example provides a bus voltage fluctuation suppression system based on voltage ANF quadrature phase shift compensation. Combined with... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, LMS is the least mean square algorithm, which is used as the application algorithm of ANF in this paper. A bus voltage fluctuation suppression system based on voltage ANF quadrature phase shift compensation is applied to the generation circuit of a DC biased vernier reluctance generator, including a DC bus, a common DC bus open winding power converter electrically connected to the DC bus, a DC biased vernier reluctance generator electrically connected to the common DC bus open winding power converter, and a control circuit; Figure 2 In converter 1: Sa1, Sb1, and Sc1 represent the upper bridge arm switching devices of the three-phase bridge arm; Sa2, Sb2, and Sc2 represent the lower bridge arm switching devices of the corresponding three-phase bridge arm; In converter 2: Sa3, Sb3, and Sc3 represent the upper bridge arm switching devices of the three-phase bridge arm; Sa4, Sb4, and Sc4 represent the lower bridge arm switching devices of the corresponding three-phase bridge arm; A1, B1, and C1: three-phase output nodes of converter 1; A2, B2, and C2: three-phase output nodes of converter 2; a i b i c The arrows indicate the current in each phase winding (phase a current, phase b current, phase c current), and the arrow direction indicates the current reference direction.

[0045] The control loop includes: a voltage adaptive notch filter detection module, a 0-axis current adaptive notch filter controller, a current distribution module, a dq-axis current regulator, a rotation / stationary coordinate transformation module, a pulse width modulation module, and a voltage / current signal processing module.

[0046] The voltage adaptive notch filter detection module is used to extract the third harmonic component of the DC bus voltage and output the quadrature phase-shift compensation current command corresponding to the third harmonic component; the 0-axis current adaptive notch filter controller is used to generate the 0-axis voltage compensation signal based on the quadrature phase-shift compensation current command and zero-sequence current feedback; the current distribution module is used to combine the DC component adjustment requirement and the quadrature phase-shift compensation requirement and output the dq0-axis current command; the dq-axis current regulator is used to output the dq0-axis voltage command based on the dq0-axis current command and dq0-axis current feedback; the rotation / stationary coordinate transformation module is used to transform the dq0-axis voltage command to the voltage command in the stationary coordinate system; the pulse width modulation module is used to generate the PWM drive signal to drive the common DC bus open winding power converter based on the voltage command in the stationary coordinate system; the voltage / current signal processing module is used to form DC bus voltage feedback and dq0-axis current feedback to form a closed-loop control to suppress the third harmonic fluctuation of the bus voltage.

[0047] In this embodiment, a bus voltage fluctuation suppression system based on voltage adaptive notch filter quadrature phase shift compensation is applied to the generation circuit of a DC-biased vernier reluctance generator. The system includes a DC bus, a common DC bus open-winding power converter electrically connected to the DC bus, a DC-biased vernier reluctance generator electrically connected to the common DC bus open-winding power converter, and a control circuit. The control circuit includes: a voltage adaptive notch filter detection module, a 0-axis current adaptive notch filter controller, a current distribution module, d-axis and q-axis current regulators, a rotation / stationary coordinate transformation module, a pulse width modulation module, and a voltage / current signal processing module.

[0048] In a feasible control process, the voltage / current signal processing module processes the DC bus voltage. The system performs sampling processing to form a DC bus voltage feedback signal. Simultaneously, the voltage / current signal processing module samples the current signal of the DC-biased vernier reluctance generator and obtains d-axis, q-axis, and 0-axis current feedback signals through coordinate transformation to form the dq0-axis current feedback. The voltage adaptive notch filter detection module receives the DC bus voltage feedback signal, extracts the third harmonic component of the DC bus voltage, and outputs the quadrature phase-shift compensation current command corresponding to the third harmonic component. The 0-axis current adaptive notch filter controller receives the quadrature phase-shift compensation current command and zero-sequence current feedback to generate a 0-axis voltage compensation signal. The current distribution module combines the DC component adjustment requirement with the quadrature phase-shift compensation requirement and outputs the dq0-axis current command. The d-axis and q-axis current regulators output the dq0-axis voltage command based on the dq0-axis current command and feedback. The rotation / stationary coordinate transformation module transforms the dq0-axis voltage command to a voltage command in a stationary coordinate system. The pulse width modulation module generates a pulse width modulation drive signal to drive the common DC bus open winding power converter based on the voltage given in the stationary coordinate system, thereby adjusting the current of the DC biased vernier reluctance generator and realizing closed-loop suppression of the third harmonic fluctuation of the DC bus voltage.

[0049] Optionally, the common DC bus open winding power converter includes two sets of three-phase converters connected to the same DC bus, and the three-phase windings of the DC biased vernier reluctance generator are respectively connected to the two sets of three-phase converters to form a zero-sequence current path into which zero-sequence harmonic current can be injected.

[0050] In this embodiment, the common DC bus open winding power converter includes two sets of three-phase converters connected to the same DC bus. The three-phase windings of the DC biased vernier reluctance generator are respectively connected to the two sets of three-phase converters to form a zero-sequence current path that can be injected with zero-sequence harmonic current.

[0051] Specifically, the two sets of three-phase converters share the DC bus, allowing the filter branch and equivalent impedance path of the DC bus to serve as a common channel for zero-sequence energy exchange. Simultaneously, since the three-phase windings of the DC-biased vernier reluctance generator are connected to the two sets of three-phase converters respectively, the potential at both ends of the windings can be synthesized collaboratively by the two sets of three-phase converters, thus enabling the voltage command corresponding to the 0-axis component to be realized at the winding ends. Based on this structure, the 0-axis voltage compensation signal output by the 0-axis current adaptive notch filter controller can effectively act on the winding current of the DC-biased vernier reluctance generator through the common DC bus open winding power converter. This allows the zero-sequence current loop to not only meet the DC component regulation requirements but also the third harmonic quadrature compensation requirements, thereby providing a current injection channel guarantee for suppressing the third harmonic fluctuations of the DC bus voltage.

[0052] Optionally, the quadrature phase-shifting compensation current given by the voltage adaptive notch filter detection module includes a cosine component and a sine component of the third harmonic compensation current, and the cosine component and the sine component are combined to form the equivalent third harmonic compensation current given to be injected into the 0-axis loop.

[0053] In this embodiment, the voltage adaptive notch filter detection module is used to extract the third harmonic component of the DC bus voltage and output the quadrature phase-shifting compensation current setting; the quadrature phase-shifting compensation current setting includes the cosine component setting and the sine component setting of the third harmonic compensation current, and the cosine component setting and the sine component setting are combined as the equivalent third harmonic compensation current setting to be injected into the 0-axis loop.

[0054] In a feasible calculation method, the DC bus voltage is... The voltage adaptive notch filter detection module decomposes the signal into a DC component. Orthogonal components of the third harmonic component , To suppress third harmonic fluctuations in the DC bus voltage, the third harmonic reference value can be set to 0, and the cosine and sine components of the third harmonic compensation current can be generated.

[0055] ;

[0056] Meanwhile, in order to achieve the target value of DC bus voltage DC component adjustment can generate DC component current command. :

[0057] ;

[0058] in Preferred selection .

[0059] Furthermore, to form an equivalent third harmonic compensation current reference that can be injected into the 0-axis loop, this embodiment maps the cosine component and sine component of the third harmonic compensation current reference to two orthogonal components that vary with three times the electrical angle, and superimposes them with the DC component:

[0060] ;

[0061] ;

[0062] in, The electrical angle feedback quantity is in radians and can be measured by the motor position sensor or output by the estimation module and provided by the voltage / current signal processing module. The equivalent third harmonic compensation current is given in amperes and is used as one of the tracking targets of the 0-axis current adaptive notch filter controller.

[0063] Optionally, the phase of the equivalent third harmonic compensation current is given relative to the third harmonic component of the DC bus voltage, satisfying a preset orthogonal phase shift relationship, so that the compensation voltage component formed by the compensation current on the DC bus side is used to cancel out the original third harmonic voltage fluctuation of the DC bus.

[0064] In this embodiment, the phase of the equivalent third harmonic compensation current is given relative to the third harmonic component of the DC bus voltage, which satisfies a preset orthogonal phase shift relationship, so that the compensation voltage component formed by the compensation current on the DC bus side is used to cancel out the original third harmonic voltage fluctuation of the DC bus.

[0065] Specifically, the voltage adaptive notch filter detection module extracts the third harmonic voltage quadrature component ( , This can be used to equivalently characterize the amplitude and phase of the third harmonic component of the DC bus voltage; from and , The equivalent third harmonic compensation current is jointly determined. The phase configuration ensures that the injected current, under the third harmonic synchronous reference, satisfies a preset orthogonal phase constraint with the target third harmonic voltage component. The engineering meaning of this preset orthogonal phase constraint is: through orthogonal phase-shifting injection, the compensation voltage component formed by the compensation current on the DC bus side is opposite or approximately opposite in phase to the original third harmonic voltage fluctuation, and is matched in amplitude, thereby achieving mutual cancellation on the bus side.

[0066] On the execution side, the common DC bus open-winding power converter, under the action of the pulse width modulation drive signal output by the pulse width modulation module, converts the dq0 axis voltage setpoint into the winding terminal voltage and drives the DC biased vernier reluctance generator current change. This current change acts on the DC bus equivalent impedance through the zero-sequence current path, thereby forming a compensation voltage component. Through the bus voltage feedback closed-loop iteration of the voltage / current signal processing module, the phase and amplitude of the compensation current are continuously adjusted, causing the residual third harmonic voltage component to tend to decrease, thereby achieving a steady-state effect of suppressing the third harmonic fluctuation of the DC bus voltage.

[0067] Optionally, the 0-axis current adaptive notch filter controller is used to extract the static component and the third harmonic quadrature component of the zero-sequence current and output the 0-axis voltage compensation signal; by adjusting the 0-axis voltage compensation signal, the zero-sequence current tracks the quadrature phase-shift compensation current, so as to realize the linkage compensation of the voltage adaptive notch filter and the 0-axis current adaptive notch filter.

[0068] In this embodiment, the 0-axis current adaptive notch filter controller is used to extract the static component and the third harmonic quadrature component of the zero-sequence current and output the 0-axis voltage compensation signal; by adjusting the 0-axis voltage compensation signal, the zero-sequence current tracks the quadrature phase-shift compensation current, so as to realize the linkage compensation of the voltage adaptive notch filter and the 0-axis current adaptive notch filter.

[0069] In practical implementation, the dq0-axis current feedback output by the voltage / current signal processing module includes a zero-sequence current feedback component. The 0-axis current adaptive notch filter controller uses this zero-sequence current feedback as its target, extracts its static component and third harmonic quadrature component, and uses the quadrature phase-shift compensation current output by the voltage adaptive notch filter detection module as a reference target to generate a 0-axis voltage compensation signal. One possible implementation is as follows:

[0070] ;

[0071] ;

[0072] in: and This represents the component of the 0-axis voltage compensation signal, expressed in volts. , Feedback of the third harmonic quadrature component of zero-sequence current, in amperes; , To correspond with the reference given, it is preferable to determine the output of the voltage adaptive notch filter detection module; , The proportional and integral coefficients of the 0-axis current adaptive notch filter controller; This is the electrical angle feedback quantity.

[0073] Through the above control, the zero-sequence current can track the quadrature phase-shift compensation current on the third harmonic quadrature component, so that the 0-axis voltage compensation signal can be used as part of the subsequent dq0-axis voltage composition, providing execution drive for the formation of compensation voltage component on the DC bus side.

[0074] Optionally, the current distribution module adopts a maximum torque per ampere current distribution strategy, combining the DC component adjustment requirement with the quadrature phase shift compensation requirement, and outputs the dq0 axis current setpoint.

[0075] In this embodiment, the current distribution module adopts the maximum torque per ampere current distribution strategy, combines the DC component adjustment requirement with the quadrature phase shift compensation requirement, and outputs the dq0 axis current setpoint.

[0076] In one possible implementation, the current distribution module provides the DC component current generated by the voltage adaptive notch filter detection module. As a component of the 0-axis current reference, and by setting the mapping relationship between the d-axis current reference and the q-axis current reference according to the maximum torque per ampere strategy, the following can be obtained:

[0077] ;

[0078] in, , , The currents for the d-axis, q-axis, and 0-axis are given respectively, in amperes. As a mapping coefficient, it can be stored as a calibration parameter and adjusted according to the model and operating conditions; this allocation method enables the 0-axis component to meet the power generation control requirements while also carrying the DC component adjustment requirements and being combined with the third harmonic compensation requirements to enter the current closed loop inlet.

[0079] Optionally, the dq-axis current regulator outputs a dq-axis voltage command signal, and superimposes the 0-axis voltage compensation signal with the DC component adjustment signal to obtain a 0-axis voltage command signal; the rotation / stationary coordinate transformation module transforms the dq0-axis voltage command to a voltage command in the stationary coordinate system based on electrical angle feedback; the pulse width modulation module performs space vector pulse width modulation on the voltage command in the stationary coordinate system to generate a PWM drive signal.

[0080] In this embodiment, the d-axis and q-axis current regulators output d-axis and q-axis voltage command signals, and the 0-axis voltage compensation signal is superimposed with the DC component adjustment signal to obtain the 0-axis voltage command signal; the rotation / stationary coordinate transformation module transforms the dq0-axis voltage command to the voltage command in the stationary coordinate system based on the electrical angle feedback; the pulse width modulation module performs space vector pulse width modulation on the voltage command in the stationary coordinate system to generate a pulse width modulation drive signal.

[0081] In one feasible implementation, the d-axis and q-axis current regulators adjust the current errors of the d-axis, q-axis, and 0-axis, and output the corresponding voltage adjustment amounts:

[0082] ;

[0083] ;

[0084] in, For dq0 axis current feedback, These are the proportional and integral coefficients.

[0085] To further suppress the third harmonic current components of the d-axis and q-axis, in one embodiment, the third harmonic current of the d-axis and q-axis can be set to 0, and an orthogonal component suppression branch can be constructed to generate the third harmonic voltage compensation amount.

[0086] ;

[0087] ;

[0088] in, Feedback is provided for the orthogonal components of the third harmonic of the d-axis and q-axis currents.

[0089] In one synthesis method, the d-axis and q-axis voltage reference signals and the 0-axis voltage reference signal can be formed by superposition as follows:

[0090] ;

[0091] ;

[0092] Subsequently, the rotation / stationary coordinate transformation module uses electrical angle feedback. The voltage setpoint on the dq0 axis is transformed to the voltage setpoint in the stationary coordinate system. The pulse width modulation module performs space vector pulse width modulation on the voltage setpoint in the stationary coordinate system to generate a pulse width modulation drive signal to drive the open winding power converter of the common DC bus. This enables the winding terminal voltage of the DC biased vernier reluctance generator to simultaneously meet the comprehensive requirements of generator current control and zero-sequence compensation injection, thereby achieving closed-loop suppression of the third harmonic fluctuation of the DC bus voltage.

[0093] To better explain and implement the above formulas, the following additional information is needed:

[0094] The bus voltage of the DC bus is expressed in volts. In one embodiment, the voltage / current signal processing module acquires the voltage through a voltage sampling circuit disposed between the positive and negative busbars of the DC bus. The voltage sampling circuit includes a voltage divider network and an isolated sampling device; the sampling period is preferably the same as or an integer multiple of the update period of the pulse width modulation module, and low-pass filtering is performed on the sampling results to suppress the switching ripple component, thereby forming a DC bus voltage feedback signal for use by the voltage adaptive notch filter detection module.

[0095] for The DC component, in volts. In one embodiment, the voltage adaptive notch filter detection module detects... The average voltage level of the bus is obtained by performing time averaging or using a low-pass filter with a cutoff frequency lower than the third harmonic frequency. The Used for calculating DC component regulation requirements and participating in DC component current setting. The generation of .

[0096] and They are respectively The cosine orthogonal component and the sine orthogonal component at the third harmonic frequency, with units of volts. In one embodiment, the voltage-adaptive notch filter detection module performs synchronous demodulation and orthogonal decomposition based on a third harmonic synchronous reference: with three times the electrical angle. Construct a synchronization reference by... and , Synchronous demodulation is performed, and the corresponding components are extracted using an adaptive notch filter to obtain... and The aforementioned and It is used to characterize the amplitude and phase information of the third harmonic voltage of the DC bus and to generate the quadrature phase-shifting compensation current.

[0097] and This is a reference value for the orthogonal component of the third harmonic of the DC bus voltage, in volts. In implementations aimed at suppressing third harmonic fluctuations, , This is to reduce the third harmonic component of the busbar; in other embodiments, the reference value can also be set as a non-zero amplitude limit or threshold to meet the engineering constraints on the allowable residual harmonics and avoid excessive compensation.

[0098] The reference voltage for DC component adjustment is in volts. The target value of DC bus voltage is preferred. The aforementioned It can be set by a host controller or energy management unit, or it can be fixed according to the desired bus voltage range under power generation conditions; in one embodiment, It allows for dynamic adjustment based on speed, load power, or bus energy demand to ensure that the DC bus meets both the load's voltage requirements and has a modulation margin for third harmonic suppression.

[0099] This is the electrical angle feedback quantity of a DC-biased vernier reluctance generator, in radians. In one embodiment, The voltage / current signal is measured by a rotor position sensor and converted by a voltage / current signal processing module; in other embodiments... It can also be obtained and output to the control loop by a positionless estimation method.

[0100] Electric angular velocity, measured in radians per second. In one embodiment, Depend on Obtained differentially within the discrete sampling period, or output by the velocity estimation module. Third harmonic synchronization angular frequency. The unit is radians per second. Preferred by Obtained. The aforementioned and Used to construct a third harmonic synchronization reference, thereby achieving [the following] And the extraction and compensation injection of the third harmonic quadrature component of the zero-sequence current.

[0101] and These are the cosine and sine component references for the third harmonic compensation current, respectively, in amperes. In one embodiment, the voltage adaptive notch filter detection module is based on ( - )and( - The error is generated through a proportional-integral step. and This is to achieve closed-loop suppression of the third harmonic voltage component of the bus.

[0102] and The voltage adaptive notch filter detection module is used to generate The proportional coefficient and integral coefficient, where The unit is amperes per volt. , The unit is amperes per volt-second. The aforementioned , The compensation response speed and steady-state error are determined; in one embodiment, , The tuning is based on the equivalent impedance of the DC bus and the desired harmonic suppression bandwidth. Limiting and anti-integral saturation logic are set for the integrator to avoid generating excessive compensation current under large disturbance conditions.

[0103] The current setpoint corresponding to the DC component is adjusted, in amperes. In one embodiment, the voltage adaptive notch filter detection module is based on ( - Error generation and will As one of the inputs to the current distribution module, it enables As a component given by the zero-axis current, it participates in the formation This allows for DC component regulation through the zero-sequence current path.

[0104] and They are respectively from , Three times the electric angle The two orthogonal injection constructs obtained by mapping are in amperes. .in , The mapping enables the compensation current to have a controllable phase configuration under the third harmonic synchronous reference, thereby satisfying the preset orthogonal phase shift relationship requirements.

[0105] The equivalent third harmonic compensation current is given, in amperes. In one embodiment, according to Obtained. The aforementioned As an equivalent compensation target for the 0-axis loop to be injected, it is used to drive the 0-axis current adaptive notch filter controller to generate the 0-axis voltage compensation signal and participate in the subsequent current setting and voltage setting generation.

[0106] and These are the cosine orthogonal component and the sinusoidal orthogonal component of the zero-sequence current feedback at the third harmonic frequency, respectively, in amperes. In one embodiment, the 0-axis current adaptive notch filter controller is based on three times the electrical angle. The zero-sequence current feedback is subjected to synchronous orthogonal decomposition and extracted using an adaptive notch filter to obtain... and .

[0107] and For reference values, the unit is amperes. In one embodiment, and Based on the output of the voltage adaptive notch filter detection module respectively and The system is configured to achieve linkage compensation between the voltage adaptive notch filter detection module and the 0-axis current adaptive notch filter controller, and to enable the zero-sequence current to form a closed-loop tracking of the compensation current on the third harmonic quadrature component.

[0108] and These are the proportional and integral coefficients of the 0-axis current adaptive notch filter controller, respectively. The unit is volts per ampere. , The unit is volts per ampere second. The aforementioned , The tracking error of the third harmonic quadrature component of the zero-sequence current is converted into a zero-axis voltage compensation signal, and the zero-sequence current is used to compensate for the given tracking speed and steady-state error. In one embodiment, the coefficient is tuned based on the equivalent resistance, inductance and desired bandwidth of the zero-sequence current path, and the integrator is limited to avoid excessive output.

[0109] and These are the two quadrature components of the 0-axis voltage compensation signal, in volts. The aforementioned , Output from the 0-axis current adaptive notch filter controller, and adjusted with the 0-axis DC component signal. Superimposed to form the 0-axis voltage setpoint signal This allows for the simultaneous implementation of DC component regulation and third harmonic compensation injection.

[0110] , , The currents for the d-axis, q-axis, and 0-axis are given respectively, in amperes. It is output by the current distribution module; , , These are current feedbacks for the d-axis, q-axis, and 0-axis, respectively, in amperes. It uses a voltage / current signal processing module to sample the three-phase current and combines it with electrical angle feedback. The coordinates are obtained by performing a coordinate transformation. The d-axis and q-axis currents are used to regulate the fundamental current for power generation control, while the 0-axis current is used to achieve superimposed control of DC bias and third harmonic compensation injection.

[0111] In one embodiment of the maximum torque per ampere current distribution strategy, the following is set: and make and Satisfy the proportional mapping relationship, for example ,in The mapping coefficient is a calibrable parameter. Its value can be adjusted according to the electromagnetic parameters, target torque requirements, and current limiting constraints of the DC biased vernier reluctance generator. It can also be adjusted to other equivalent proportional coefficients under different models or operating conditions to obtain better maximum torque per ampere effect.

[0112] and These are the proportional and integral coefficients of the current regulator, respectively. The unit is volts per ampere. , The unit is volts per ampere second. The aforementioned , Used to , as well as The error is converted into a corresponding voltage regulation amount, which determines the dynamic response and steady-state error of the current closed loop; in one embodiment, the coefficient is tuned based on the motor's equivalent inductance, resistance, sampling period, and desired control bandwidth.

[0113] , , These represent the fundamental or DC component voltage adjustment values ​​for the d-axis, q-axis, and 0-axis, respectively, in volts. The aforementioned , As the fundamental components for the d-axis and q-axis voltage references, the As the DC component adjustment signal of the 0 axis and , Superposition .

[0114] , These are the cosine orthogonal components and sinusoidal orthogonal components of the d-axis current at the third harmonic frequency, respectively. q31 i q32 These represent the cosine orthogonal component and the sinusoidal orthogonal component of the q-axis current at the third harmonic frequency, respectively, both in amperes. In one embodiment, the aforementioned orthogonal components are derived by a synchronous orthogonal decomposition stage within the voltage / current signal processing module or current regulator. Extracted. The third harmonic reference value is set to 0 to reduce the harmonic current components of the d-axis and q-axis, thereby reducing their coupling interference to the bus third harmonic compensation link.

[0115] and These are the proportional and integral coefficients for the third harmonic suppression branch, respectively, in volts per ampere. With volts per ampere per second The coefficient is used to convert (0- ), (0- (0-i) q31 ), 0-i q32 The error is converted into the third harmonic voltage compensation amount. and with , The final d-axis and q-axis voltage settings are superimposed to improve the current waveform and enhance bus ripple suppression stability.

[0116] , , These are the voltage reference signals for the d-axis, q-axis, and 0-axis, respectively, in volts. .in , , The rotation / stationary coordinate transformation module is based on electrical angle feedback. Will and Transform the voltage given component into a stationary coordinate system, for example, form and and with Together they constitute the voltage reference in the stationary coordinate system used by the pulse width modulation module.

[0117] The pulse width modulation module performs space vector pulse width modulation on the voltage given in the stationary coordinate system and generates a pulse width modulation drive signal to drive the bridge arm power devices of the common DC bus open winding power converter. In one embodiment, the modulation frequency is a fixed value or a configurable value, and the update period of the pulse width modulation drive signal is matched with the sampling period of the voltage / current signal processing module to form a stable discrete-time closed loop.

[0118] To avoid the voltage adaptive notch filter detection module outputting excessively large compensation current under conditions of large bus voltage disturbances or short-term anomalies, in one embodiment... , and Set a limiting constraint and set anti-integral saturation logic for the integral circuit; the limiting threshold can be determined based on the allowable current of the common DC bus open winding power converter, the allowable 0-axis current range of the DC biased vernier reluctance generator, and the allowable ripple current of the bus filter branch.

[0119] , The setting can be determined based on the equivalent impedance range of the DC bus at the third harmonic frequency and the desired suppression bandwidth: when the equivalent impedance of the bus is large, it should be appropriately increased. and To enhance compensation; when the equivalent impedance of the busbar is small or the ripple pressure of the filter branch is large, appropriately reduce... and This reduces the injection intensity and ensures system stability.

[0120] To avoid the output of the 0-axis current adaptive notch filter controller , In one embodiment, the voltage capability of the power converter with open winding on the common DC bus is exceeded. , Amplitude limiting is applied, and... , The integral stage is limited or frozen; when an abnormal zero-sequence current feedback or an abnormal electrical angle feedback is detected, it is preferable to temporarily reduce the gain of the compensation channel or exit the third harmonic compensation branch to avoid compensation mismatch caused by reference distortion.

[0121] , The tuning can be determined based on the equivalent resistance and equivalent inductance of the zero-sequence current path, so that the zero-axis current has sufficient tracking bandwidth for the quadrature phase-shift compensation current without introducing overshoot; in one embodiment, the tuning process can also consider the discrete delay of the sampling period and the pulse width modulation update period to improve the closed-loop stability margin.

[0122] , Used to generate , , In one embodiment, an amplitude limit is set for the aforementioned voltage regulation amount so that it does not exceed the current DC bus voltage of the common DC bus open-winding power converter. The achievable voltage vector range; when the system is triggered by current limiting, it is preferable to take anti-integral saturation measures for the integral element to avoid excessive voltage setpoint change after the limiting is lifted.

[0123] If the instruction manual retains the third harmonic suppression branch, then for Similarly, set the amplitude limit and... , A segmented gain or limited gain strategy is adopted to avoid adverse coupling between the harmonic suppression branch and the bus third harmonic compensation branch.

[0124] To ensure that the pulse width modulation module can correctly execute space vector pulse width modulation and output a stable pulse width modulation drive signal, in one embodiment, the voltage is given in the stationary coordinate system. Implement voltage vector limiting to maintain modulation margin; when When a reduction or sudden load change causes the voltage vector demand to approach its upper limit, it is preferable to use a compensation channel (i.e., from...) , and The introduced components are prioritized for reduction to ensure basic power generation control and system safety.

[0125] The core working principle of this embodiment is as follows: Taking the DC bus voltage as the observation object, the voltage adaptive notch filter detection module extracts the third harmonic component of the DC bus voltage and converts the extracted third harmonic component into a quadrature phase shift compensation current setpoint that satisfies a preset quadrature phase shift relationship; then, the 0-axis current adaptive notch filter controller, combined with zero-sequence current feedback, performs closed-loop tracking of the quadrature phase shift compensation current setpoint to generate a 0-axis voltage compensation signal; simultaneously, the current distribution module combines the DC component adjustment requirement with the quadrature phase shift compensation requirement and outputs the dq0-axis current setpoint; the dq-axis current regulator adjusts the current according to the dq0-axis current... The dq0-axis current feedback outputs the dq0-axis voltage setpoint; the rotating / stationary coordinate transformation module transforms the dq0-axis voltage setpoint to the voltage setpoint in the stationary coordinate system; the pulse width modulation module generates a pulse width modulation drive signal to drive the common DC bus open winding power converter based on the voltage setpoint in the stationary coordinate system, thereby injecting compensation current into the zero-sequence current path formed by the common DC bus open winding power converter and the DC biased vernier reluctance generator, so that the compensation voltage component formed by the compensation current on the DC bus side cancels out the original third harmonic voltage fluctuation of the DC bus, thereby realizing closed-loop suppression of the third harmonic fluctuation of the DC bus voltage.

[0126] In the aforementioned principle chain, the voltage / current signal processing module forms DC bus voltage feedback and dq0-axis current feedback, enabling the various modules of the control loop to work collaboratively under the same feedback system: the voltage adaptive notch filter detection module focuses on extracting the third harmonic component from the DC bus voltage feedback and forming the quadrature phase-shifting compensation current setpoint, determining the "target frequency component and phase relationship for compensation" from the source; the 0-axis current adaptive notch filter controller focuses on extracting the static component of the zero-sequence current and the third harmonic quadrature component from the dq0-axis current feedback, and realizes real-time tracking of the zero-sequence current to the quadrature phase-shifting compensation current setpoint by outputting the 0-axis voltage compensation signal, ensuring from the execution side that "the compensation current can be accurately injected according to the set phase relationship". The current distribution module combines the DC component regulation requirement with the quadrature phase shift compensation requirement, so that the DC component regulation of the DC bus voltage and the suppression of third harmonic fluctuations are unified and coordinated under the same current setting framework, avoiding mutual interference between different regulation objectives. The dq axis current regulator, rotating / stationary coordinate transformation module, and pulse width modulation module convert the above-mentioned combined current setting and compensation amount into the drive signal of the common DC bus open winding power converter, so that the common DC bus open winding power converter forms a zero-sequence current path on the same DC bus that can inject zero-sequence harmonic current, thereby effectively applying the compensation current to the circuit corresponding to the three-phase winding of the DC biased vernier reluctance generator, realizing the suppression of third harmonic voltage fluctuations on the DC bus side.

[0127] The achieved effects include at least the following: First, the voltage adaptive notch filter detection module extracts the third harmonic component of the DC bus voltage and outputs a quadrature phase-shift compensation current setting that corresponds to the third harmonic component and satisfies a preset quadrature phase-shift relationship. This allows the compensation target to be directly established around the third harmonic component of the DC bus voltage, enabling targeted suppression of the bus's third harmonic fluctuations and improving the directionality and convergence speed of the suppression effect. Second, the zero-axis current adaptive notch filter controller generates a zero-axis voltage compensation signal based on the quadrature phase-shift compensation current setting and zero-sequence current feedback. This allows the zero-sequence current to form a closed-loop tracking of the compensation current setting, reducing compensation mismatch caused by execution-side disturbances, parameter drift, or load fluctuations, and enhancing the stability of third harmonic cancellation. Third, through... The overcurrent distribution module combines the DC component regulation requirement with the quadrature phase-shifting compensation requirement, and the dq-axis current regulator outputs the dq0-axis voltage setpoint, enabling the DC component regulation of the DC bus voltage and the suppression of third harmonic fluctuations to be carried out in the same control framework, reducing control conflicts caused by mutual coupling. Fourth, relying on the common DC bus open winding power converter, a zero-sequence current path that can inject zero-sequence harmonic current is formed on the same DC bus, so that the compensation current has a clear injection path and controllable execution means. From the structural level, it ensures that the quadrature phase-shifting compensation strategy is feasible, closed-loop, and engineering-implementable, thereby effectively suppressing DC bus voltage fluctuations and improving the bus voltage quality and system operation stability of the DC biased vernier reluctance generator generation circuit.

[0128] A bus voltage fluctuation suppression method based on voltage ANF quadrature phase shift compensation is proposed, applied to the aforementioned bus voltage fluctuation suppression system based on voltage ANF quadrature phase shift compensation, combined with... Figure 7 As shown, the bus voltage fluctuation suppression method based on voltage ANF quadrature phase shift compensation includes:

[0129] S1 extracts the third harmonic component of the DC bus voltage and outputs the quadrature phase-shifting compensation current corresponding to the third harmonic component.

[0130] S2, Based on the quadrature phase-shifting compensation current given and the zero-sequence current feedback, a zero-axis voltage compensation signal is generated;

[0131] S3 combines the DC component adjustment requirement with the quadrature phase shift compensation requirement and outputs the dq0 axis current command.

[0132] S4, based on the given dq0 axis current and the feedback of the dq0 axis current, outputs the given dq0 axis voltage;

[0133] S5, transform the voltage reference of the dq0 axis to the voltage reference in the stationary coordinate system;

[0134] S6, Generate a PWM drive signal to drive the common DC bus open winding power converter based on the voltage given in the stationary coordinate system;

[0135] S7 forms DC bus voltage feedback and dq0 axis current feedback to form a closed-loop control that suppresses the third harmonic fluctuation of the bus voltage.

[0136] Example 2: This example encompasses all the content of Example 1, providing a bus voltage fluctuation suppression system based on voltage ANF quadrature phase-shift compensation. In Example 1, the voltage adaptive notch filter detection module generates a quadrature phase-shift compensation current reference based on the third harmonic component of the DC bus voltage. The 0-axis current adaptive notch filter controller generates a 0-axis voltage compensation signal based on the quadrature phase-shift compensation current reference and zero-sequence current feedback, and the signal is injected and executed by the d-axis and q-axis current regulators, the rotation / stationary coordinate transformation module, and the pulse width modulation module. This scheme can suppress the third harmonic fluctuation of the DC bus voltage under most operating conditions.

[0137] However, in practical engineering applications, the filter branch parameters and wiring parasitic parameters of the DC bus will change with temperature, aging, and assembly differences. Furthermore, the open-winding power converter with a common DC bus experiences dead time, drive delay, and sampling delay under pulse-width modulation drive signals. These factors will cause the actual phase and amplitude of the quadrature phase-shift compensation current on the execution side to deviate from the theoretical setting, thus reducing the degree of cancellation between the compensation voltage component and the original third harmonic voltage fluctuation. Therefore, in this embodiment, a "non-ideal reference on the execution side and a healthy reference on the bus" is introduced in the setpoint generation stage of the voltage adaptive notch filter detection module to construct an online-updable phase and amplitude self-tuning mechanism to improve the robustness of third harmonic fluctuation suppression.

[0138] Let the third harmonic quadrature component of the DC bus voltage extracted by the voltage adaptive notch filter detection module be... , Let the orthogonal components of the third harmonic current of the DC bus be... (It can be obtained by the voltage / current signal processing module through third harmonic synchronous demodulation of the DC bus current, or by estimation of the zero-sequence current feedback and energy relationship), then the third harmonic equivalent complex impedance is estimated as follows:

[0139] ;

[0140] And obtain the amplitude and phase:

[0141] ;

[0142] in The phase angle of the third harmonic equivalent impedance is expressed in radians.

[0143] In this second embodiment, a comprehensive phase compensation angle is constructed. In addition to the ideal orthogonal terms, it also includes the following parameters: the temperature function of the equivalent series resistance of the filter capacitor, the dead time, and the sampling delay. One implementation can be expressed as follows:

[0144] ;

[0145] The meanings, units, and acquisition methods of each parameter are as follows:

[0146] Third harmonic synchronization angular frequency, unit rad / s; fed back by electrical angle. The electric angular velocity is obtained by taking three times the electric angular velocity.

[0147] Dead time, in seconds; a drive configuration parameter or online measurement parameter for the common DC bus open winding power converter.

[0148] Temperature function of the equivalent series resistance of the filter capacitor, in Ω; The capacitor temperature is measured in °C or K and can be obtained from a temperature sensor. It can be obtained by looking up the device data curves in a table or estimated and updated from the operating data.

[0149] DC bus filter capacitor, unit F; is the nominal or rated value of the device.

[0150] Equivalent time delay between sampling and calculation, in seconds; can be obtained by controller timing measurement or online identification.

[0151] The phase angle of the third harmonic equivalent impedance of the busbar is calculated by the formula.

[0152] In Embodiment 1, the cosine and sine component inputs are obtained by adjusting the voltage error. Embodiment 2, while maintaining the existing structure of "the voltage adaptive notch filter detection module outputting the cosine and sine component inputs," introduces... The phase is reconstructed to make the output more closely match the actual phase on the execution side:

[0153] ;

[0154] in The value of the third harmonic compensation current is given in amperes.

[0155] To ensure that the compensation amplitude remains safe and effective under conditions of changes in bus parasitic parameters or capacitor aging, this second embodiment introduces bus parasitic inductance. With capacitor health factors .

[0156] Capacitor health factors It can be constructed as follows:

[0157] ;

[0158] in:

[0159] : RMS value of filter capacitor ripple current, in A; can be estimated from the DC bus current ripple component by the voltage / current signal processing module.

[0160] Rated ripple current of the filter capacitor, in amperes (A); from device parameters.

[0161] : The equivalent series resistance reference value at the reference temperature, in Ω; is the calibration value.

[0162] Calibration coefficient, dimensionless.

[0163] Busbar parasitic inductance The unit H can be an assembly calibration parameter or an online identification parameter. Based on this, one implementation of the compensation current amplitude setting is given:

[0164] ;

[0165] in This is the amplitude scaling factor (calibration parameter).

[0166] When generating the quadrature phase-shift compensation current setpoint, the voltage adaptive notch filter detection module can comprehensively consider factors such as dead time, sampling delay, temperature variation of the equivalent series resistance of the filter capacitor, and busbar parasitic inductance, so that the generated cosine component setpoint and sine component setpoint are closer to the preset quadrature phase-shift relationship on the execution side. In long-term operation, the compensation amplitude is self-converged through the capacitor health factor, thereby improving the suppression effect and stability of the third harmonic fluctuation of the DC bus voltage.

[0167] To better explain and implement the above formulas, the following additional information is needed:

[0168] and These are the cosine orthogonal component and the sinusoidal orthogonal component of the DC bus current at the third harmonic frequency, respectively, in amperes. In one embodiment, the voltage / current signal processing module processes the DC bus current. Sampling, and based on Construct synchronous orthogonal references, for Perform synchronous demodulation and adaptive notch filtering extraction to obtain... , .

[0169] This is an estimate of the equivalent complex impedance of the DC bus at the third harmonic frequency, in ohms. Its amplitude Used to characterize the bus voltage fluctuation amplitude caused by a unit current at the third harmonic frequency. Impedance phase angle, in radians. It is used to characterize the phase relationship between the third harmonic voltage component and the third harmonic current component.

[0170] The dead time or equivalent drive delay of the common DC bus open-winding power converter is expressed in seconds. This is obtained from the driver parameter configuration; This refers to the temperature of the DC bus filter capacitor, expressed in °C or K. The value is a function of the equivalent series resistance of the filter capacitor as a function of temperature, in ohms. , This is the DC bus filter capacitor value, in farads. ; The equivalent time delay between sampling and computation is expressed in seconds. The above parameters are used together to construct the integrated phase compensation angle and improve the consistency of the execution side of quadrature phase shift compensation.

[0171] The equivalent parasitic inductance formed by the DC busbar and connecting conductors, measured in Henry. ; The capacitance health factor is a dimensionless quantity with a preferred value range. ; This is the RMS value of the filter capacitor ripple current, in amperes. , The rated ripple current of the filter capacitor is in amperes. , The equivalent series resistance reference value at the reference temperature, in ohms. ; , and These are calibration parameters used for construction. It also achieves self-tuning and convergence control of the given compensation current amplitude.

[0172] Based on the working principle of the closed-loop control link of Embodiment 1, the core of this embodiment is: the voltage adaptive notch filter detection module introduces adaptive correction for changes in non-ideal factors on the execution side and equivalent characteristics of the DC bus during the generation of the quadrature phase-shifting compensation current, so that the quadrature phase-shifting compensation current can still meet the preset quadrature phase-shifting relationship when it is actually injected into the zero-sequence current path, thereby improving the consistency of the compensation voltage component with the original third harmonic voltage fluctuation of the DC bus. Specifically, in addition to generating DC bus voltage feedback and dq0-axis current feedback, the voltage / current signal processing module can also provide information on orthogonal components related to the third harmonic (e.g., the orthogonal components of the third harmonic of the DC bus voltage, and the orthogonal components of the third harmonic of the DC bus current or equivalent characteristic). The voltage adaptive notch filter detection module estimates the equivalent impedance characteristics of the DC bus at the third harmonic frequency based on the aforementioned feedback. Furthermore, by combining the drive delay factor of the common DC bus open-winding power converter and the sampling calculation delay factor of the voltage / current signal processing module, it performs online correction of the phase of the equivalent third harmonic compensation current, making the phase of the equivalent third harmonic compensation current more stable relative to the third harmonic component of the DC bus voltage. The orthogonal phase shift relationship is satisfied; subsequently, the 0-axis current adaptive notch filter controller still generates the 0-axis voltage compensation signal based on the corrected orthogonal phase shift compensation current and zero-sequence current feedback; the current distribution module still combines the DC component adjustment requirement and the orthogonal phase shift compensation requirement to output the dq 0-axis current setting; the dq axis current regulator, the rotating / stationary coordinate transformation module and the pulse width modulation module still generate the pulse width modulation drive signal to drive the common DC bus open winding power converter in the manner of Embodiment 1, thereby injecting a compensation current with corrected phase characteristics into the zero-sequence current path, so that the compensation voltage component formed by the compensation current on the DC bus side can more fully cancel each other with the original third harmonic voltage fluctuation of the DC bus, and achieve stronger robust suppression of the third harmonic fluctuation of the bus.

[0173] In the above-mentioned further working mechanism, the voltage adaptive notch filter detection module can also introduce a self-convergence constraint on the long-term operating state changes when generating a given compensation current amplitude, so as to avoid excessive amplification of the compensation injection when the device ages or the ripple pressure increases. Specifically, the voltage adaptive notch filter detection module, while using the amplitude of the third harmonic component of the DC bus voltage to characterize the compensation requirement, can combine the effective value of the ripple current or the equivalent loss characterization quantity provided by the voltage / current signal processing module to apply a state-varying convergence factor to the compensation current amplitude setting, so that the compensation amplitude achieves an adaptive balance between the "bus third harmonic suppression effect" and the "carrying capacity of the bus filter branch and the zero-sequence current path". On this basis, the 0-axis voltage compensation signal output by the 0-axis current adaptive notch filter controller is still superimposed with the DC component adjustment signal to form the 0-axis voltage setting signal. The dq-axis current regulator outputs the dq 0-axis voltage setting, and through the rotation / stationary coordinate transformation module and the pulse width modulation module, a stable driving signal is formed. This realizes the orthogonal phase-shift compensation injection strategy of "enhanced phase consistency and amplitude self-convergence", so that the compensation can remain stable and effective under different operating conditions, different temperatures and long-term operating parameter drift conditions.

[0174] Combination Figure 8As shown, the effects achieved in this embodiment include at least the following: First, by using the voltage adaptive notch filter detection module to estimate the equivalent characteristics of the third harmonic of the DC bus online, and combining the drive delay factor of the common DC bus open winding power converter and the sampling calculation delay factor of the voltage / current signal processing module, the phase of the quadrature phase shift compensation current is adaptively corrected, making the phase cancellation relationship between the compensation voltage component formed by the compensation current on the DC bus side and the original third harmonic voltage fluctuation more stable, thereby maintaining a high third harmonic fluctuation suppression capability even under load changes, temperature changes, or parameter drift; Second, while maintaining the closed-loop tracking of the compensation current by the 0-axis current adaptive notch filter controller, the zero-sequence current tracks the corrected compensation current more accurately, reducing compensation mismatch caused by non-ideal execution side, and improving closed-loop convergence speed and steady-state suppression. Third, by introducing state-related self-convergence constraints into the compensation current amplitude setting by the voltage adaptive notch filter detection module, the compensation injection can be automatically adjusted according to the change of the bus filter branch carrying capacity, reducing the risk of overcompensation when the device ages, the ripple pressure increases, or the boundary conditions of the operating conditions change, thereby improving the stability and reliability of the system in long-term operation; Fourth, since Embodiment 2 does not change the basic control links of the current distribution module, dq axis current regulator, rotating / stationary coordinate transformation module and pulse width modulation module, and only performs adaptive correction of phase and amplitude in the setting generation stage of the voltage adaptive notch filter detection module, the robustness and engineering adaptability of the DC bus voltage third harmonic fluctuation suppression can be improved without increasing the system hardware complexity, thereby improving the bus voltage quality and overall operating stability of the DC biased vernier reluctance generator generation circuit.

[0175] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of protection of the present invention. Therefore, all equivalent technical changes made based on the content of the present invention specification and drawings are included within the scope of protection of the present invention. Furthermore, the elements therein can be updated as technology develops.

Claims

1. A bus voltage fluctuation suppression system based on voltage ANF quadrature phase shift compensation, applied to the generation circuit of a DC biased vernier reluctance generator, characterized in that, It includes a DC bus, a common DC bus open-winding power converter electrically connected to the DC bus, a DC biased vernier reluctance generator electrically connected to the common DC bus open-winding power converter, and a control circuit; The control loop includes at least: a voltage adaptive notch filter detection module, a zero-axis current adaptive notch filter controller, and a pulse width modulation module; wherein, the voltage adaptive notch filter detection module is used to extract the third harmonic component of the DC bus voltage and output the quadrature phase-shift compensation current given corresponding to the third harmonic component; the zero-axis current adaptive notch filter controller is used to generate a zero-axis voltage compensation signal based on the quadrature phase-shift compensation current given and zero-sequence current feedback; the pulse width modulation module is used to generate a pulse width modulation drive signal to drive the common DC bus open winding power converter based on the zero-axis voltage compensation signal, so as to suppress the third harmonic fluctuation of the DC bus voltage; The quadrature phase-shifting compensation current given by the voltage adaptive notch filter detection module includes the cosine component and the sine component of the third harmonic compensation current, and the cosine component and the sine component are combined to serve as the equivalent third harmonic compensation current given to be injected into the 0-axis loop. The phase of the equivalent third harmonic compensation current is given relative to the third harmonic component of the DC bus voltage, which satisfies a preset orthogonal phase shift relationship, so that the compensation voltage component formed by the compensation current on the DC bus side is used to cancel out the original third harmonic voltage fluctuation of the DC bus. The zero-axis current adaptive notch filter controller is used to extract the static component and the third harmonic quadrature component of the zero-sequence current and output the zero-axis voltage compensation signal; by adjusting the zero-axis voltage compensation signal, the zero-sequence current tracks the quadrature phase-shift compensation current, so as to realize the linkage compensation of the voltage adaptive notch filter and the zero-axis current adaptive notch filter. The control loop also includes: a current distribution module, a dq-axis current regulator, a rotation / stationary coordinate transformation module, and a voltage / current signal processing module; The current distribution module combines the DC component adjustment requirement with the quadrature phase shift compensation requirement and outputs the dq0-axis current setpoint; the dq-axis current regulator outputs the dq0-axis voltage setpoint based on the dq0-axis current setpoint and dq0-axis current feedback; the rotating / stationary coordinate transformation module transforms the dq0-axis voltage setpoint to a voltage setpoint in a stationary coordinate system; the pulse width modulation module generates a PWM drive signal to drive the common DC bus open winding power converter based on the voltage setpoint in the stationary coordinate system; and the voltage / current signal processing module forms DC bus voltage feedback and dq0-axis current feedback to constitute a closed-loop control that suppresses the third harmonic fluctuation of the bus voltage. The current distribution module adopts the maximum torque per ampere current distribution strategy, combines the DC component adjustment requirement with the quadrature phase shift compensation requirement, and outputs the dq0 axis current setpoint. The dq-axis current regulator outputs a dq-axis voltage command signal, and superimposes the 0-axis voltage compensation signal with the DC component adjustment signal to obtain the 0-axis voltage command signal; the rotation / stationary coordinate transformation module transforms the dq0-axis voltage command to a voltage command in the stationary coordinate system based on electrical angle feedback; the pulse width modulation module performs space vector pulse width modulation on the voltage command in the stationary coordinate system to generate a PWM drive signal; Let the third harmonic quadrature component of the DC bus voltage extracted by the voltage adaptive notch filter detection module be... Let the orthogonal components of the third harmonic current of the DC bus be... The third harmonic equivalent complex impedance is estimated by either synchronous demodulating the DC bus current using the voltage / current signal processing module or by estimating the zero-sequence current feedback and energy relationship. ； And obtain the amplitude and phase: ； in The phase angle of the third harmonic equivalent impedance, in radians; Constructing the integrated phase compensation angle The expression is as follows: ； The meanings, units, and acquisition methods of each parameter are as follows: Third harmonic synchronization angular frequency, unit rad / s; fed back by electrical angle. The electric angular velocity is obtained by taking three times the calculated value; Dead time, in seconds; is the drive configuration parameter or online measurement parameter for the common DC bus open winding power converter. Temperature function of the equivalent series resistance of the filter capacitor, in Ω; The capacitor temperature is measured in °C or K by a temperature sensor. Obtained by looking up device data curves in a table or estimated and updated from operating data; DC bus filter capacitor, unit F; is the nominal or rated value of the device; Equivalent time delay between sampling and calculation, in seconds; obtained by controller timing measurement or online identification; Phase angle of the third harmonic equivalent impedance of the busbar, calculated by the formula; Introduction The phase is reconstructed to make the output more closely match the actual phase on the execution side: ； in The amplitude of the third harmonic compensation current is given, in amperes; Introducing parasitic inductance of busbar With capacitor health factors , Capacitor health factors Construct it as follows: ； in: : RMS value of filter capacitor ripple current, in amperes (A); estimated by the voltage / current signal processing module from the DC bus current ripple component; Rated ripple current of the filter capacitor, in amperes (A); from device parameters; : The equivalent series resistance reference value at the reference temperature, in Ω; is the calibration value; Calibration coefficient, dimensionless; Busbar parasitic inductance Based on the unit H, one implementation of the compensation current amplitude is given: ； in This is the amplitude scaling factor.

2. The bus voltage fluctuation suppression system based on voltage ANF quadrature phase shift compensation according to claim 1, characterized in that, The common DC bus open winding power converter includes two sets of three-phase converters connected to the same DC bus. The three-phase windings of the DC biased vernier reluctance generator are respectively connected to the two sets of three-phase converters to form a zero-sequence current path for injecting zero-sequence harmonic current.

3. A bus voltage fluctuation suppression method based on voltage ANF quadrature phase-shift compensation, applied to the bus voltage fluctuation suppression system based on voltage ANF quadrature phase-shift compensation as described in claim 2, wherein the bus voltage fluctuation suppression method based on voltage ANF quadrature phase-shift compensation comprises: S1 extracts the third harmonic component of the DC bus voltage and outputs the quadrature phase-shifting compensation current corresponding to the third harmonic component. S2, Based on the quadrature phase-shifting compensation current given and the zero-sequence current feedback, a zero-axis voltage compensation signal is generated; S3 combines the DC component adjustment requirement with the quadrature phase shift compensation requirement and outputs the dq0 axis current command. S4, based on the given dq0 axis current and the feedback of the dq0 axis current, outputs the given dq0 axis voltage; S5, transform the voltage reference of the dq0 axis to the voltage reference in the stationary coordinate system; S6, Generate a PWM drive signal to drive the common DC bus open winding power converter based on the voltage given in the stationary coordinate system; S7 forms DC bus voltage feedback and dq0 axis current feedback to form a closed-loop control that suppresses the third harmonic fluctuation of the bus voltage.

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