High-power-to-weight-ratio controllable rectifier for hybrid power system and control method

Abstract

The invention provides a high-power-to-weight-ratio controllable rectifier for a hybrid power system and a control method, and relates to the technical field of power electronics. The controllable rectifier comprises a silicon carbide SiC full-bridge controllable rectifier module used for rectifying multi-phase alternating current output of a generator in the hybrid power system into direct current and providing the direct current to a load; the control module is used for receiving the real-time feedback signal, generating a control signal according to the real-time feedback signal, receiving the real-time monitoring signal and executing a protection action when the real-time monitoring signal is abnormal; the driving module is used for generating a driving signal according to the control signal and transmitting the driving signal to the silicon carbide SiC full-bridge controllable rectifier module; and the power module is used for supplying power to the control module and the driving module. According to the method, the problems of efficiency and control stability of the hybrid power system in the dynamic operation process are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and in particular to a high power-to-weight ratio controllable rectifier and control method for hybrid power systems. Background Technology

[0002] Hybrid power generation systems (HPHS) are technologies that combine traditional aircraft engines and electric propulsion systems, aiming to improve fuel efficiency, reduce emissions, and provide solutions for the sustainable development of the aviation industry. The generator rectifier in an HPHS system is a key component that converts the alternating current (AC) generated by the generator into direct current (DC), and is crucial for the effective management and distribution of electricity. The generators used in HPHS systems need to have high power density and high efficiency to meet the stringent weight and space constraints of aircraft. Simultaneously, the rectifier in an HPHS system needs to be able to handle high-voltage and high-frequency AC power to meet the requirements of the electric propulsion system.

[0003] Currently, there are no mature and controllable rectifier devices on the market suitable for aviation hybrid power generation systems. Aviation hybrid power generation systems require generators with a speed of 40,000 rpm, a high-voltage 800VAC line voltage, and a rated power of 800 kW. Existing generator rectifiers cannot fully meet the high power density and high efficiency requirements of aviation hybrid power generation systems, especially under high speed and high voltage conditions. Maintaining the stability and efficiency of the rectifier is a significant technical challenge. Furthermore, aviation hybrid power generation systems have strict limitations on weight and size. Existing generator rectifiers cannot achieve lightweight and miniaturized designs while meeting performance requirements, thus failing to meet the strict space constraints of aircraft and presenting significant development challenges. Summary of the Invention

[0004] To address the shortcomings of the existing technologies, this invention proposes a high power-to-weight ratio controllable rectifier for hybrid power systems. The aim is to design a controllable rectifier with a high voltage level, high power, and small size for aviation hybrid power generation systems, thereby ensuring that the output voltage of the aviation hybrid power generation system is controllable and stable.

[0005] On one hand, the present invention proposes a high power-to-weight ratio controllable rectifier for a hybrid power system, the controllable rectifier comprising: a silicon carbide (SiC) full-bridge controllable rectifier module, a signal acquisition module, a control module, a drive module, a power supply module, and a load fuse;

[0006] The input terminal of the silicon carbide (SiC) full-bridge controllable rectifier module is connected to the output terminal of the generator in the hybrid power system. It is used to rectify the multi-phase AC output of the generator into DC power according to the drive signal from the drive module. The output terminal of the silicon carbide (SiC) full-bridge controllable rectifier module forms a DC bus and is connected to the load in the hybrid power system through a load fuse.

[0007] The signal acquisition module is used to acquire the generator rotor resolver analog signal, the generator multiphase output current and the DC voltage of the DC bus in real time and send them to the control module as real-time feedback signals.

[0008] The control module is used to generate a control signal based on the received real-time feedback signal and transmit the control signal to the drive module; receive a real-time monitoring signal and perform a protection action when the real-time monitoring signal is abnormal;

[0009] The drive module is used to generate a drive signal according to the control signal from the control module, and transmit the drive signal to the silicon carbide (SiC) full-bridge controllable rectifier module.

[0010] The power module is used to supply power to the control module and the drive module.

[0011] Furthermore, the silicon carbide (SiC) full-bridge controllable rectifier module includes several power switch bridges, and the several power switch bridges adopt a symmetrical layout structure.

[0012] Furthermore, the real-time feedback signal includes: generator rotor resolver analog signal, generator multiphase output current, and DC voltage of the DC bus;

[0013] The real-time monitoring signals include: generator temperature signal and DC bus output current.

[0014] Furthermore, the specific content of generating the control signal based on the received real-time feedback signal is as follows:

[0015] The generator rotor resolver analog signal is acquired and decoded to obtain the rotor electrical angle and real-time mechanical speed;

[0016] Based on the rotor electrical angle, Clark and Park transformations are performed on the multiphase output current of the generator to obtain the quadrature-axis current. and direct-axis current ;

[0017] The target DC voltage value is obtained by subtracting the DC voltage value from the DC bus voltage and processing it through a PI proportional-integral regulator. The target regulating torque is then obtained by inverting the sign of the output of the PI proportional-integral regulator.

[0018] The target regulating torque is processed using the maximum torque-to-current ratio (MTPA) algorithm to generate the target quadrature-axis current. and target direct-axis current ;

[0019] Calculate the target quadrature-axis current With cross-axis current The first difference and the target direct-axis current With direct axis current The second difference is then processed by a PI proportional-integral regulator to obtain the quadrature-axis voltage. and direct axis voltage ;

[0020] Based on the rotor electrical angle, the quadrature-axis voltage and direct axis voltage Perform the inverse Park transform to obtain Axis voltage components and Axis voltage components Then, the SVPWM algorithm is used to generate control signals;

[0021] During the generation of control signals, the real-time mechanical speed, target DC voltage value, and quadrature-axis voltage are used as the basis. and direct axis voltage The target direct-axis current is obtained using the maximum torque-voltage ratio (MTPV) algorithm. Compensation will be provided.

[0022] Furthermore, the specific content of performing protective actions when the real-time monitoring signal is abnormal is as follows:

[0023] The generator temperature signal is converted into a generator temperature, and the generator temperature is compared with a set temperature threshold. If the generator temperature exceeds the set temperature threshold, a shutdown command is generated to shut down the output of the controllable rectifier and a fault signal is generated; otherwise, the controllable rectifier continues to work.

[0024] The output current of the DC bus is compared with a set overcurrent threshold. If the output current exceeds the set overcurrent threshold, a shutdown command is generated to shut down the output of the controllable rectifier and a fault signal is generated; otherwise, the controllable rectifier continues to operate.

[0025] Furthermore, the controllable rectifier also includes: a communication interface, a level input interface, and a level output interface;

[0026] The communication interface is connected to the control module and is used to acquire preset operating parameters and control commands, and output the status information of the controllable rectifier; wherein the control commands are the shut-down command and start-up command of the controllable rectifier; the status information includes: fault signal, normal operation signal and ready signal;

[0027] The level input interface is connected to the control module and is used to acquire switch control signals; wherein the switch control signals are used to control the control module to perform start, stop and reset operations;

[0028] The level output interface is connected to the control module and is used to provide status information of the controllable rectifier.

[0029] On the other hand, the present invention proposes a high power-to-weight ratio controllable rectifier control method for hybrid power systems, which is implemented using the aforementioned high power-to-weight ratio controllable rectifier for hybrid power systems. This method includes the following steps:

[0030] The generator rotor resolver simulation signal and generator multiphase output current are acquired, and the rotor electrical angle and real-time mechanical speed are obtained by decoding the generator rotor resolver simulation signal.

[0031] Based on the field-oriented control (FOC) framework, the multiphase output current of the generator is transformed by Clark and Park according to the rotor electrical angle to obtain the quadrature-axis current and the direct-axis current.

[0032] The target DC voltage value and the DC voltage of the DC bus are obtained, and the difference between the target DC voltage value and the DC voltage of the DC bus is input into the PI proportional-integral controller. Then, the sign of the output of the PI proportional-integral controller is inverted to obtain the target regulating torque.

[0033] The target regulating torque is processed using the maximum torque-to-current ratio (MTPA) algorithm to generate the target quadrature-axis current and the target direct-axis current.

[0034] The direct-axis current compensation strategy is selected by comparing the real-time mechanical speed with the preset speed threshold, and the target direct-axis current is compensated by the selected direct-axis current compensation strategy.

[0035] Calculate the first difference between the target quadrature-axis current and the second difference between the target direct-axis current and the direct-axis current. Process the first and second differences through a PI proportional-integral regulator to obtain the quadrature-axis voltage and the direct-axis voltage.

[0036] Based on the rotor electrical angle, an inverse Park transform is performed on the quadrature-axis voltage and the direct-axis voltage to obtain... Axis voltage components and The shaft voltage component is then used to generate a control signal using the SVPWM algorithm;

[0037] Based on the control signal, the conduction and cutoff of the bridge circuit in the full-bridge controllable SiC module are controlled, thereby performing controllable rectification of the multi-phase AC output of the generator and providing the output DC power to the load.

[0038] Furthermore, the specific content of selecting a direct-axis current compensation strategy by comparing the real-time mechanical rotation speed with a preset rotation speed threshold, and compensating the target direct-axis current using the selected direct-axis current compensation strategy, is as follows:

[0039] When the real-time mechanical speed exceeds the preset speed threshold, the target direct-axis current is compensated using the maximum torque-voltage ratio (MTPV) algorithm; when the real-time mechanical speed does not exceed the preset speed threshold, there is no need to compensate the target direct-axis current.

[0040] The method for compensating the target direct-axis current using the maximum torque-voltage ratio (MTPV) algorithm is as follows:

[0041] Calculate the voltage reference value based on the DC voltage target value, and calculate the stator voltage vector magnitude based on the quadrature-axis voltage and direct-axis voltage;

[0042] The difference between the voltage reference value and the stator voltage vector amplitude is input into the PI proportional-integral regulator to obtain the direct-axis current compensation value.

[0043] The target direct-axis current is updated by summing the target direct-axis current and the direct-axis current compensation value, thus completing the compensation for the target direct-axis current.

[0044] The beneficial effects of adopting the above technical solution are as follows:

[0045] This invention innovatively designs a novel small-volume, high-power controllable rectifier suitable for an aviation hybrid power system generator with a line voltage of 800VAC and a rated power of 800KW. Specifically, it is a controllable rectifier with high power density, which is applied to the low-altitude economic industry.

[0046] The controllable rectifier designed in this invention features data measurement, display, and fault protection. It reserves communication and protection control interfaces, namely level input and level output interfaces, and also possesses certain voltage and speed regulation functions. Under conditions of ultra-high generator speed operation, high line voltage, high load power, small size requirements for hybrid power systems, and constantly changing loads in hybrid power systems, this controllable rectifier can ensure that the output voltage of the hybrid power generation system is controllable and stable, and adjustable within a certain range, with a voltage adjustment range of ±30% of the rated voltage. Simultaneously, the rectification efficiency of this controllable rectifier can reach over 99%.

[0047] The controllable rectifier designed in this invention selects a novel silicon carbide (SiC) full-bridge controllable rectifier module to replace the traditional insulated-gate bipolar transistor (IGBT) module. This not only improves the control frequency and enhances control performance, but also reduces power loss at high frequencies, effectively reducing system size and improving heat dissipation performance.

[0048] The controllable rectifier designed in this invention innovatively combines the maximum torque per ampere (MTPA) and maximum torque per voltage (MTPV) algorithms in its control algorithm and applies them to a high-speed, high-voltage, high-power, and small-size controllable rectifier, which significantly improves the system control efficiency, reduces the system power consumption loss, and thus reduces the system size.

[0049] In summary, the controllable rectifier designed in this invention is a high-power device for controlling a generator to provide electrical energy to a load. This controllable rectifier not only possesses a certain degree of speed regulation capability but also integrates data measurement, display, and fault protection functions, and is equipped with a communication interface. It can automatically achieve precise control of the generator to ensure stable generator operation, thereby improving the safety and reliability of the hybrid power system. Furthermore, by innovatively combining MTPA and MTPV control algorithms, this controllable rectifier effectively solves the efficiency and control stability problems of hybrid power systems during dynamic operation. Attached Figure Description

[0050] Figure 1 This is a structural diagram of a high power-to-weight ratio controllable rectifier for a hybrid power system in this embodiment;

[0051] Figure 2 This is the electrical hardware topology diagram of the generator in this embodiment;

[0052] Figure 3 This is a flowchart of a high power-to-weight ratio controllable rectifier control method for a hybrid power system in this embodiment;

[0053] Figure 4 This is a control block diagram of the controllable rectifier in this embodiment. Detailed Implementation

[0054] To facilitate understanding of this application, specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following embodiments are illustrative of the invention but are not intended to limit its scope. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0055] Example 1:

[0056] This embodiment provides a high power-to-weight ratio controllable rectifier for a hybrid power system, such as... Figure 1 As shown, the controllable rectifier includes: a silicon carbide (SiC) full-bridge controllable rectifier module, a signal acquisition module, a control module, a drive module, a power supply module, and a load fuse.

[0057] In this embodiment, the six-phase output of the generator in the hybrid power system is connected to a high power-to-weight ratio controllable rectifier, such as... Figure 2 As shown, the generator has two sets of three-phase windings, meaning the generator output has six phases, which are connected in parallel in pairs to form a double three-phase system: phases A and B are connected in parallel, and phases C and C are connected in parallel, with each phase differing by 120 electrical degrees. The high power-to-weight ratio controllable rectifier outputs the rectified DC power to the load, thereby realizing the transmission and distribution of electrical energy. The generator's rotation is driven by the front shaft and does not require control; therefore, the high power-to-weight ratio controllable rectifier designed in this embodiment is only used to control the generator's output.

[0058] The input terminal of the silicon carbide (SiC) full-bridge controllable rectifier module is connected to the output terminal of the generator in the hybrid power system. It is used to rectify the multi-phase AC output of the generator into DC power according to the drive signal from the drive module. The output terminal of the silicon carbide (SiC) full-bridge controllable rectifier module forms a DC bus and is connected to the load in the hybrid power system through a load fuse.

[0059] In this embodiment, the load fuse is used to provide overcurrent protection for the load.

[0060] The silicon carbide (SiC) full-bridge controllable rectifier module includes several power switch bridges, and the several power switch bridges adopt a symmetrical layout structure.

[0061] In this embodiment, since the rated power of the controllable rectifier is 800KW and the weight requirement is within 30 kg, optimal efficiency needs to be achieved within a limited volume. Therefore, the power module in the generator controllable rectifier needs to use a silicon carbide module with excellent high-frequency performance instead of the traditional IGBT module. However, there are currently no mature ultra-high power products on the market that use silicon carbide modules. Therefore, this embodiment proposes to use a silicon carbide SiC full-bridge controllable rectifier module as the power module in the generator controllable rectifier. Because it is to be used in high-power equipment, and especially to ensure the reliable operation of the controllable rectifier, the six bridge circuits inside the silicon carbide SiC full-bridge controllable rectifier module in this embodiment must have very similar distributed parameters such as resistance, inductance, and capacitance, such as a symmetrical layout structure, to achieve current sharing and voltage stress balance.

[0062] The signal acquisition module is used to acquire the generator rotor resolver analog signal, the generator multiphase output current and the DC voltage of the DC bus in real time and send them to the control module as real-time feedback signals.

[0063] In this embodiment, a generator resolver encoder is used to acquire the real-time mechanical angle of the generator rotor, generating a generator rotor resolver analog signal, thereby enabling the control module to decode the rotor electrical angle and real-time mechanical speed. The generator resolver encoder is typically mounted on the generator rotor. A Hall current sensor is used to detect the multi-phase output current of the generator, and a bus voltage sensor is used to detect the DC voltage on the DC bus. Both the Hall current sensor and the bus voltage sensor are powered by the power supply module.

[0064] The control module is used to generate control signals based on the received real-time feedback signals and transmit the control signals to the drive module; receive real-time monitoring signals and perform protection actions when the real-time monitoring signals are abnormal.

[0065] The real-time monitoring signals include: generator temperature signal and DC bus output current.

[0066] In this embodiment, a temperature sensor is used to monitor the generator temperature in real time to obtain the generator temperature signal. A Hall current sensor is used to monitor the output current of the DC bus in real time, and this Hall current sensor is powered by the power supply module.

[0067] The specific content of generating control signals based on received real-time feedback signals is as follows:

[0068] The generator rotor resolver analog signal is acquired and decoded to obtain the rotor electrical angle and real-time mechanical speed.

[0069] In this embodiment, the control module is used for load monitoring, control, and protection of the hybrid power system. Specifically, the control module has a built-in resolver decoding chip AD2S1210, which is used to decode the real-time detected generator rotor resolver analog signal to obtain the real-time encoder position of the motor rotor, i.e., the rotor electrical angle and the real-time mechanical speed.

[0070] Based on the rotor electrical angle, Clark and Park transformations are performed on the multiphase output current of the generator to obtain the quadrature-axis current. and direct-axis current .

[0071] The target DC voltage value is obtained by subtracting the target DC voltage value from the DC voltage of the DC bus and processing it through a PI proportional-integral regulator. Then, the sign of the output of the PI proportional-integral regulator is inverted to obtain the target regulating torque.

[0072] The target regulating torque is processed using the maximum torque-to-current ratio (MTPA) algorithm to generate the target quadrature-axis current. and target direct-axis current .

[0073] Calculate the target quadrature-axis current With cross-axis current The first difference and the target direct-axis current With direct axis current The second difference is then processed by a PI proportional-integral regulator to obtain the quadrature-axis voltage. and direct axis voltage .

[0074] Based on the rotor electrical angle, the quadrature-axis voltage and direct axis voltage Perform the inverse Park transform to obtain Axis voltage components and Axis voltage components Then, the SVPWM algorithm is used to generate control signals.

[0075] During the generation of control signals, the real-time mechanical speed, target DC voltage value, and quadrature-axis voltage are used as the basis. and direct axis voltage The target direct-axis current is obtained using the maximum torque-voltage ratio (MTPV) algorithm. Compensation will be provided.

[0076] The specific details of executing protective actions when real-time monitoring signals are abnormal are as follows:

[0077] The generator temperature signal is converted into a generator temperature, and the generator temperature is compared with a set temperature threshold. If the generator temperature exceeds the set temperature threshold, a shutdown command is generated to shut down the output of the controllable rectifier and a fault signal is generated; otherwise, the controllable rectifier continues to operate.

[0078] In this embodiment, the generator temperature signal is used for temperature monitoring of the generator body. When the temperature exceeds a set threshold, the output of the controllable rectifier needs to be shut down.

[0079] The output current of the DC bus is compared with a set overcurrent threshold. If the output current exceeds the set overcurrent threshold, a shutdown command is generated to shut down the output of the controllable rectifier and a fault signal is generated; otherwise, the controllable rectifier continues to operate.

[0080] The controllable rectifier also includes: a communication interface, a level input interface, and a level output interface.

[0081] The communication interface is connected to the control module and is used to acquire preset operating parameters and control commands, and output the status information of the controllable rectifier; wherein the control commands are the shutdown command and startup command of the controllable rectifier; the status information includes: fault signal, normal operation signal and ready signal.

[0082] In this embodiment, the communication interface is used to receive external control commands, parameter configurations, or synchronization signals. The preset operating parameter is the target DC voltage value. When the controllable rectifier completes its power-on self-test, all modules are successfully initialized, and no hardware faults or persistent external anomalies are detected, the control module generates a ready signal. When the control module receives a valid start command, successfully drives the silicon carbide full-bridge controllable rectifier module to start working, and all real-time monitoring signals are within the normal range, and the real-time feedback signal indicates that the system is performing effective rectification, the control module generates a normal operation signal.

[0083] The level input interface is connected to the control module and is used to acquire switch control signals; wherein the switch control signals are used to control the control module to perform start, stop and reset operations.

[0084] In this embodiment, the level input interface is used to receive real-time signals from the upstream and downstream devices of the controllable rectifier in the hybrid power system, namely, switch control signals used to control the control module to perform start-up, shutdown and reset operations.

[0085] The level output interface is connected to the control module and is used to provide status information of the controllable rectifier.

[0086] In this embodiment, the level output interface is used to feed back the status information of the controllable rectifier to the upstream and downstream devices of the controllable rectifier in the hybrid power system.

[0087] The drive module is used to generate a drive signal based on the control signal from the control module, and transmit the drive signal to the silicon carbide (SiC) full-bridge controllable rectifier module.

[0088] In this embodiment, the drive module generates drive signals based on the SVPWM control signals output by the control module, which are used to control the conduction and cutoff of each bridge circuit in the silicon carbide (SiC) full-bridge controllable rectifier module. The generator's output line voltage in the hybrid power system is 800VAC, with a peak voltage of approximately 1120V, falling into the high-voltage category and posing a high risk. Furthermore, there are no mature products on the market with corresponding voltage levels for reference, which places higher demands on the design of the controllable rectifier, especially the drive section. Simultaneously, the generator's rated speed is 40,000 revolutions per minute, further demanding higher control speed and accuracy from the control module. This embodiment ensures the consistency of parameters in each loop through continuous design and debugging.

[0089] The power module is used to supply power to the control module and the drive module.

[0090] In this embodiment, the power module provides a stable 24V DC power supply for the internal operation of the entire controllable rectifier to ensure the normal operation of the controllable rectifier.

[0091] Example 2:

[0092] This embodiment provides a high power-to-weight ratio controllable rectifier control method for hybrid power systems, such as... Figure 3 As shown, the method includes the following steps:

[0093] The generator rotor resolver simulation signal and the generator multiphase output current are acquired, and the rotor electrical angle is obtained by decoding the generator rotor resolver simulation signal. And real-time mechanical speed.

[0094] Based on the field-oriented control (FOC) framework, according to the rotor electrical angle The quadrature-axis current is obtained by performing Clark and Park transformations on the multiphase output current of the generator. and direct-axis current .

[0095] In this embodiment, taking three-phase current as an example, the software collects the output of the three-phase Hall current sensor in real time and converts it into three-phase current. , , The true value is obtained by real-time acquisition of the output signal of the resolver decoding chip AD2S1210 to determine the real-time encoder position of the motor rotor and calculate the rotor electrical angle. And real-time mechanical speed. Under the Field Oriented Control (FOC) framework, Clark and Park transformations are performed on the three-phase currents to obtain the AC and DC axis currents. and .

[0096] Obtain the target value of DC voltage DC voltage of DC bus and the target value of DC voltage DC voltage of DC bus The difference is input into the PI proportional-integral controller, and then the sign of the output of the PI proportional-integral controller is inverted to obtain the target regulating torque.

[0097] The target regulating torque is processed using the maximum torque-to-current ratio (MTPA) algorithm to generate the target quadrature-axis current. and target direct-axis current .

[0098] A direct-axis current compensation strategy is selected by comparing the real-time mechanical speed with a preset speed threshold, and the selected direct-axis current compensation strategy is then used to adjust the target direct-axis current. Compensation will be provided.

[0099] The process involves selecting a direct-axis current compensation strategy by comparing the real-time mechanical speed with a preset speed threshold, and then using the selected direct-axis current compensation strategy to adjust the target direct-axis current. The specific details of the compensation are as follows:

[0100] When the real-time mechanical speed exceeds the preset speed threshold, the target direct-axis current is determined using the maximum torque-voltage ratio (MTPV) algorithm. Compensation is required; when the real-time mechanical speed does not exceed the preset speed threshold, there is no need to adjust the target direct-axis current. Compensation will be provided.

[0101] The target direct-axis current is obtained by using the maximum torque-voltage ratio (MTPV) algorithm. The method of compensation is as follows:

[0102] Calculate the voltage reference value based on the DC voltage target value, and calculate the quadrature axis voltage. and direct axis voltage Calculate the magnitude of the stator voltage vector.

[0103] The difference between the voltage reference value and the stator voltage vector amplitude is input into the PI proportional-integral controller to obtain the direct-axis current compensation value. .

[0104] By targeting the direct-axis current and direct-axis current compensation value Add them together to update the target direct-axis current. Complete the target direct-axis current Compensation.

[0105] Calculate the target quadrature-axis current With cross-axis current The first difference and the target direct-axis current With direct axis current The second difference is then processed by a PI proportional-integral regulator to obtain the quadrature-axis voltage. and direct axis voltage .

[0106] Based on the rotor electrical angle, the quadrature-axis voltage and direct axis voltage Perform the inverse Park transform to obtain Axis voltage components and Axis voltage components Then, the SVPWM algorithm is used to generate control signals.

[0107] In this embodiment, for the electric motor, the SVPWM algorithm controls the conduction sequence of the power modules to invert the DC bus voltage into three-phase AC power. For the generator, the SVPWM algorithm regulates the motor output torque by controlling the conduction sequence of the power modules, i.e., the silicon carbide (SiC) full-bridge controllable rectifier modules, to rectify the three-phase AC power into DC power. It should be noted that since the generated target regulating torque needs to be opposite to the motor speed direction, and the force generated by the interaction of the stator and rotor magnetic fields needs to be opposite to the generator rotation direction, this embodiment obtains the target regulating torque by inverting the sign of the PI proportional-integral regulator output.

[0108] In this embodiment, as Figure 4 As shown, the target value of DC voltage It refers to the set voltage regulation value and target value of the entire system, and the DC voltage of the DC bus. It involves actually measuring the voltage and feedback quantity of the DC bus. The difference between the target quantity and the feedback quantity is calculated and output as the target regulating torque via a PI proportional-integral controller. Target regulating torque The direction of rotation must be opposite to the motor's rotational speed for the motor to be in generating mode. Target adjustment torque. The target quadrature and direct axis currents are obtained using the MTPA maximum torque-current ratio algorithm. and , respectively with and The difference is obtained through a PI proportional-integral controller. and The results were obtained through inverse Park transformation and rotor electrical angle. and The input is fed into the Space Vector Pulse Width Modulation (SVPWM) algorithm, and the final state of each switch is obtained through vector transformation, i.e., the space voltage PWM duty cycle.

[0109] Based on the control signal, the conduction and cutoff of the bridge circuit in the full-bridge controllable SiC module are controlled, thereby performing controllable rectification of the multi-phase AC output of the generator and providing the output DC power to the load.

[0110] It should be noted that the design and parameter tuning of the controllable rectifier are based on the ideal condition of balanced current in each phase. Therefore, adjustments need to be made promptly when an imbalance in the generator's phase output is detected. First, it needs to be explained how to determine whether the phase currents are balanced. Taking three-phase current as an example, the collected three-phase current... , , Summing and averaging yields the average current. Then use three-phase current , , respectively with Subtract, then take the absolute value and divide by The current deviation of each phase is obtained. If the obtained current deviation exceeds... of If an imbalance is detected in the current output of each phase, it is considered an imbalance. Secondly, timely adjustments are necessary when an imbalance is detected in the system's phase outputs. For example, the calculated current deviations of each phase are input to three independent compensators to generate three-phase equalization compensation voltages. These three-phase equalization compensation voltages are then superimposed on the original three-phase voltages, and dynamic compensation is performed using the SVPWM algorithm until the current deviations of the three phases stabilize and fall back to a normal level. of Within this range, high-precision automatic flow equalization can be achieved.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. 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 defined by the present invention.

Claims

1. A high power-to-weight ratio controllable rectifier for a hybrid power system, characterized in that, The controllable rectifier includes: a silicon carbide (SiC) full-bridge controllable rectifier module, a signal acquisition module, a control module, a drive module, a power supply module, and a load fuse; The input terminal of the silicon carbide (SiC) full-bridge controllable rectifier module is connected to the output terminal of the generator in the hybrid power system. It is used to rectify the multi-phase AC output of the generator into DC power according to the drive signal from the drive module. The output terminal of the silicon carbide (SiC) full-bridge controllable rectifier module forms a DC bus and is connected to the load in the hybrid power system through a load fuse. The signal acquisition module is used to acquire the generator rotor resolver analog signal, the generator multiphase output current and the DC voltage of the DC bus in real time and send them to the control module as real-time feedback signals. The control module is used to generate a control signal based on the received real-time feedback signal and transmit the control signal to the drive module; receive a real-time monitoring signal and perform a protection action when the real-time monitoring signal is abnormal; The drive module is used to generate a drive signal according to the control signal from the control module, and transmit the drive signal to the silicon carbide (SiC) full-bridge controllable rectifier module. The power module is used to supply power to the control module and the drive module.

2. The high power-to-weight ratio controllable rectifier for a hybrid power system according to claim 1, characterized in that, The silicon carbide (SiC) full-bridge controllable rectifier module includes several power switch bridges, and the several power switch bridges adopt a symmetrical layout structure.

3. A high power-to-weight ratio controllable rectifier for a hybrid power system according to claim 2, characterized in that, The real-time monitoring signals include: generator temperature signal and DC bus output current.

4. A high power-to-weight ratio controllable rectifier for a hybrid power system according to claim 3, characterized in that, The specific content of generating control signals based on received real-time feedback signals is as follows: The generator rotor resolver analog signal is acquired and decoded to obtain the rotor electrical angle and real-time mechanical speed; Based on the rotor electrical angle, Clark and Park transformations are performed on the multiphase output current of the generator to obtain the quadrature-axis current. and direct-axis current ; The target DC voltage value is obtained by subtracting the DC voltage value from the DC bus voltage and processing it through a PI proportional-integral regulator. The target regulating torque is then obtained by inverting the sign of the output of the PI proportional-integral regulator. The target regulating torque is processed using the maximum torque-to-current ratio (MTPA) algorithm to generate the target quadrature-axis current. and target direct-axis current ; Calculate the target quadrature-axis current With cross-axis current The first difference and the target direct-axis current With direct-axis current The second difference is then processed by a PI proportional-integral regulator to obtain the quadrature-axis voltage. and direct axis voltage ; Based on the rotor electrical angle, the quadrature-axis voltage and direct axis voltage Perform the inverse Park transform to obtain Axis voltage components and Axis voltage components Then, the SVPWM algorithm is used to generate control signals; During the generation of control signals, the real-time mechanical speed, target DC voltage value, and quadrature-axis voltage are used as the basis. and direct axis voltage The target direct-axis current is obtained using the maximum torque-voltage ratio (MTPV) algorithm. Compensation will be provided.

5. A high power-to-weight ratio controllable rectifier for a hybrid power system according to claim 4, characterized in that, The specific details of executing protective actions when real-time monitoring signals are abnormal are as follows: The generator temperature signal is converted into a generator temperature, and the generator temperature is compared with a set temperature threshold. If the generator temperature exceeds the set temperature threshold, a shutdown command is generated to shut down the output of the controllable rectifier and a fault signal is generated; otherwise, the controllable rectifier continues to work. The output current of the DC bus is compared with a set overcurrent threshold. If the output current exceeds the set overcurrent threshold, a shutdown command is generated to shut down the output of the controllable rectifier and a fault signal is generated; otherwise, the controllable rectifier continues to operate.

6. A high power-to-weight ratio controllable rectifier for a hybrid power system according to claim 5, characterized in that, The controllable rectifier also includes: a communication interface, a level input interface, and a level output interface; The communication interface is connected to the control module and is used to acquire preset operating parameters and control commands, and output the status information of the controllable rectifier; wherein the control commands are the shut-down command and start-up command of the controllable rectifier; the status information includes: fault signal, normal operation signal and ready signal; The level input interface is connected to the control module and is used to acquire switch control signals; wherein the switch control signals are used to control the control module to perform start, stop and reset operations; The level output interface is connected to the control module and is used to provide status information of the controllable rectifier.

7. A control method for a high power-to-weight ratio controllable rectifier for a hybrid power system, implemented using the high power-to-weight ratio controllable rectifier for a hybrid power system as described in any one of claims 1-6, characterized in that... This method includes the following steps: The generator rotor resolver simulation signal and generator multiphase output current are acquired, and the rotor electrical angle and real-time mechanical speed are obtained by decoding the generator rotor resolver simulation signal. Based on the field-oriented control (FOC) framework, the multiphase output current of the generator is transformed by Clark and Park according to the rotor electrical angle to obtain the quadrature-axis current and the direct-axis current. The target DC voltage value and the DC voltage of the DC bus are obtained, and the difference between the target DC voltage value and the DC voltage of the DC bus is input into the PI proportional-integral controller. Then, the sign of the output of the PI proportional-integral controller is inverted to obtain the target regulating torque. The target regulating torque is processed using the maximum torque-to-current ratio (MTPA) algorithm to generate the target quadrature-axis current and the target direct-axis current. The direct-axis current compensation strategy is selected by comparing the real-time mechanical speed with the preset speed threshold, and the target direct-axis current is compensated by the selected direct-axis current compensation strategy. Calculate the first difference between the target quadrature-axis current and the second difference between the target direct-axis current and the direct-axis current. Process the first and second differences through a PI proportional-integral regulator to obtain the quadrature-axis voltage and the direct-axis voltage. Based on the rotor electrical angle, an inverse Park transform is performed on the quadrature-axis voltage and the direct-axis voltage to obtain... Axis voltage components and The shaft voltage component is then used to generate a control signal using the SVPWM algorithm; Based on the control signal, the conduction and cutoff of the bridge circuit in the full-bridge controllable SiC module are controlled, thereby performing controllable rectification of the multi-phase AC output of the generator and providing the output DC power to the load.

8. The high power-to-weight ratio controllable rectifier control method for a hybrid power system according to claim 7, characterized in that, The specific details of selecting a direct-axis current compensation strategy by comparing the real-time mechanical speed with a preset speed threshold, and then using the selected direct-axis current compensation strategy to compensate the target direct-axis current are as follows: When the real-time mechanical speed exceeds the preset speed threshold, the target direct-axis current is compensated using the maximum torque-voltage ratio (MTPV) algorithm; when the real-time mechanical speed does not exceed the preset speed threshold, there is no need to compensate the target direct-axis current. The method for compensating the target direct-axis current using the maximum torque-voltage ratio (MTPV) algorithm is as follows: Calculate the voltage reference value based on the DC voltage target value, and calculate the stator voltage vector magnitude based on the quadrature-axis voltage and direct-axis voltage; The difference between the voltage reference value and the stator voltage vector amplitude is input into the PI proportional-integral regulator to obtain the direct-axis current compensation value. The target direct-axis current is updated by summing the target direct-axis current and the direct-axis current compensation value, thus completing the compensation for the target direct-axis current.

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