An internal high-voltage direct-current power generation system and a parallel control method thereof

Abstract

The embodiment of the application discloses an internal high-voltage direct-current power generation system and a parallel control method thereof, relates to the technical field of starting power generation, and can improve the utilization rate of the internal space of an engine and improve reliability. The application comprises a double-rotor electrically excited doubly salient motor installed in the internal space of the engine and an external parallel power supply system. A magnetic isolation material is installed in a stator core, the stator core and an outer rotor core constitute a starter generator installed on a high-pressure shaft of the engine, and the stator core and an inner rotor core constitute a generator installed on a low-pressure shaft of the engine. The starter generator and the generator are combined into a double-rotor electrically excited doubly salient motor, the power density and the utilization rate of the internal space of the engine are improved, parallel control is performed through the external parallel power supply system, the power generation operation of the system is more reliable, and the dynamic performance and the working efficiency of the engine are improved.

Description

Technical Field

[0001] This invention relates to the field of starting and power generation technology, and in particular to an internal high-voltage direct current power generation system and its parallel control method. Background Technology

[0002] More-electric engines are the core of more-electric / all-electric aircraft, while internal power generation systems are the foundation for their development. With the increasing demand for onboard secondary energy and electrical power, the research and development of internal power generation systems is becoming increasingly important, and the market's requirements for them are also rising.

[0003] The starter-generator rotor is directly mounted on the high-voltage shaft inside the engine, while the generator rotor is directly mounted on the low-voltage shaft inside the engine. This avoids the use of a complex and prone-to-failure engine accessory drive housing. However, it requires the installation of two motors inside the engine, resulting in insufficient reliability of the system's power generation operation. Existing built-in starter-generator systems consist of two motors: a starter-generator mounted on the high-voltage shaft and a generator mounted on the low-voltage shaft. These two motors exist independently, requiring a certain amount of space to be reserved inside the engine. This leads to insufficient utilization of the engine's internal space, and the internal structure is not compact enough, resulting in low internal integration.

[0004] Therefore, how to improve the utilization rate of the engine's internal space and enhance its reliability has become an issue that requires further research and improvement. Summary of the Invention

[0005] Embodiments of the present invention provide an internal high-voltage direct current power generation system and its parallel control method, which can improve the utilization rate of the internal space of the engine and improve reliability.

[0006] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0007] Firstly, providing a kind of Figure 1 The built-in high-voltage DC power generation system shown includes: a dual-rotor electrically excited dual-salient pole motor (3) installed inside the engine (1) and an external parallel power supply system;

[0008] like Figure 2The dual-rotor electrically excited doubly salient pole motor (3) shown is a three-phase motor. The stator and rotor structure of the dual-rotor electrically excited doubly salient pole motor (3) includes: an outer rotor (3a), a stator (3b), and an inner rotor (3c). The outer rotor (3a) and stator (3b) constitute the first motor part of the dual-rotor electrically excited doubly salient pole motor (3), and the inner rotor (3c) and stator (3b) constitute the second motor part.

[0009] The components of the stator (3b) of the dual-rotor electrically excited doubly salient pole motor include: the stator core (8) of the dual-rotor electrically excited doubly salient pole motor, the magnetic shielding material (10), the external excitation winding (11) of the dual-rotor electrically excited doubly salient pole motor, the external armature winding (12) of the dual-rotor electrically excited doubly salient pole motor, the internal excitation winding (14) of the dual-rotor electrically excited doubly salient pole motor, and the internal armature winding (15) of the dual-rotor electrically excited doubly salient pole motor;

[0010] The components of the outer rotor (3a) of the dual-rotor electrically excited doubly salient pole motor include: the outer rotor core (9) of the dual-rotor electrically excited doubly salient pole motor;

[0011] The components of the inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor include: the inner rotor core (13) of the dual-rotor electrically excited doubly salient pole motor;

[0012] The magnetic shielding material (10) is embedded inside the stator core (8) of the dual-rotor electrically excited dual-salient pole motor. The magnetic shielding material (10) divides the stator core (8) of the dual-rotor electrically excited dual-salient pole motor into an inner region and an outer region. The inner region is close to the inner rotor core (13) of the dual-rotor electrically excited dual-salient pole motor, and the outer region is close to the outer rotor core (9) of the dual-rotor electrically excited dual-salient pole motor.

[0013] The winding positions of the external excitation winding (11) and the external armature winding (12) of the dual-rotor electrically excited dual-salient pole motor are located in the external region, while the winding positions of the internal excitation winding (14) and the internal armature winding (15) of the dual-rotor electrically excited dual-salient pole motor are located in the internal region.

[0014] In a second aspect, the method provided by the embodiments of the present invention includes an internal high-voltage DC power generation system comprising: a dual-rotor electrically excited dual-salient pole motor (3) installed inside the engine (1) and an external parallel power supply system; the external parallel power supply system comprises: a bridge uncontrolled rectifier circuit, an excitation power circuit, a current distribution control circuit, a circuit breaker module and a 270V DC bus.

[0015] The current distribution control circuit includes: PID-1 regulator, PID-2 regulator, PID-3 regulator, PID-4 regulator, PI-1 regulator, PI-2 regulator, node 1, node 2, node 3, node 4, node 5, node 6 and node 7;

[0016] The first input terminal of node 1 of the current distribution control circuit is connected to the positive output terminal of the first bridge uncontrolled rectifier circuit, and the second input terminal of node 1 is connected to the positive output terminal of the second bridge uncontrolled rectifier circuit.

[0017] The output of node 1 is used as the first input of node 2 after passing through the gain K, where the value of K is in the range of [0,1]. The second input of node 2 is connected to the positive output of the first bridge uncontrolled rectifier circuit so that the negative value of the output current of the first bridge uncontrolled rectifier circuit can be used as the input of the second input of node 2.

[0018] The output of node 2 is used as the first input of node 3 after passing through the PID-3 regulator. The second input of node 3 is used as the reference voltage of the DC bus voltage. The negative value of the output voltage of the first bridge uncontrolled rectifier circuit is used as the input of the third input of node 3.

[0019] The output of node 3 is used as the first input of node 4 after passing through a PI-1 regulator. The second input of node 4 is connected to the positive output of the first excitation power circuit so that the negative value of the output current of the first excitation power circuit can be used as the input of the second input of node 4. The output of node 4 is used as the duty cycle signal after passing through a PID-1 regulator as the control signal of the power switch of the first excitation power circuit.

[0020] The output terminal of node 1 of the current distribution control circuit is used as the first input terminal of node 5 after passing through a gain of 1-K. The second input terminal of node 5 is connected to the positive output terminal of the second bridge uncontrolled rectifier circuit so that the negative value of the output current of the second bridge uncontrolled rectifier circuit can be used as the input of the second input terminal of node 5.

[0021] The output of node 5 is used as the first input of node 6 after passing through the PID-4 regulator. The second input of node 6 is the reference voltage of the DC bus voltage, so that the negative value of the output voltage of the second bridge uncontrolled rectifier circuit can be used as the input of the third input of node 6.

[0022] The output of node 6 is used as the first input of node 7 after passing through the PI-2 regulator. The second input of node 7 is connected to the positive output of the second excitation power circuit so that the negative value of the output current of the second excitation power circuit can be used as the input of the second input of node 7.

[0023] The output of node 7, after passing through the PID-2 regulator, outputs a duty cycle signal as the control signal for the power switch of the second excitation power circuit.

[0024] The internal high-voltage direct current generator system and its parallel control method provided in this embodiment combine the starter generator installed on the high-voltage shaft (16) of the engine (1) and the generator installed on the low-voltage shaft (17) of the engine (1) into a dual-rotor electrically excited dual-salient pole motor (3), making the internal space more compact, improving the utilization rate of the internal space, and also improving the power density and working efficiency of the system; and the scheme in this embodiment adopts a parallel structure, which improves the reliability of engine (1) operation compared with the series structure in the prior art. In addition, when using an external parallel power supply system, the engine (1) can obtain good dynamic performance by adjusting the gain K during acceleration and deceleration. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A simplified structural diagram of an engine-integrated high-voltage direct current generator system provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic cross-sectional view of a dual-rotor electrically excited doubly salient pole motor provided in an embodiment of the present invention;

[0028] Figure 3 A detailed structural diagram of the external parallel power supply system provided in the embodiments of the present invention;

[0029] Figure 4 This is a structural diagram of a bridge uncontrolled rectifier circuit provided in an embodiment of the present invention;

[0030] Figure 5 This is a structural diagram of the excitation power circuit provided in an embodiment of the present invention;

[0031] The labels in the diagram represent: 1-engine, 2-fan and turbocharger, 3-dual-rotor electrically excited dual-salient-pole motor (3a-external rotor of dual-rotor electrically excited dual-salient-pole motor, 3b-stator of dual-rotor electrically excited dual-salient-pole motor, 3c-inner rotor of dual-rotor electrically excited dual-salient-pole motor), 4-high-pressure compressor, 5-combustion chamber, 6-high-pressure turbine, 7-low-pressure turbine, 8-stator core of dual-rotor electrically excited dual-salient-pole motor, 9-external rotor core of dual-rotor electrically excited dual-salient-pole motor, 10-magnetic shielding material, 11-external excitation winding of dual-rotor electrically excited dual-salient-pole motor, 12-external armature winding of dual-rotor electrically excited dual-salient-pole motor, 13-inner rotor core of dual-rotor electrically excited dual-salient-pole motor, 14-inner excitation winding of dual-rotor electrically excited dual-salient-pole motor, 15-inner armature winding of dual-rotor electrically excited dual-salient-pole motor, 16-high-pressure shaft, 17-low-pressure shaft. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Embodiments of the present invention will be described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in the specification of the present invention means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or couplings. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0033] This invention provides a method such as Figure 1The internal high-voltage direct current power generation system shown includes: a dual-rotor electrically excited dual-salient pole motor (3) installed inside the engine (1) and an external parallel power supply system; at both ends of the engine (1), a fan and a booster compressor (2) and a low-pressure turbine (7) are respectively installed, and the fan and the booster compressor (2) and the low-pressure turbine (7) are coaxially connected. Specifically, the dual-rotor electrically excited dual-salient pole motor (3) (including the dual-rotor electrically excited dual-salient pole motor outer rotor (3a), the dual-rotor electrically excited dual-salient pole motor stator (3b) and the dual-rotor electrically excited dual-salient pole motor inner rotor (3c)) installed at the front end of the high-pressure compressor (4) inside the engine (1) is installed. The dual-rotor electrically excited dual-salient pole motor outer rotor (3a) is coaxially installed with the high-pressure shaft (16) of the engine (1), and the dual-rotor electrically excited dual-salient pole motor inner rotor (3c) is coaxially installed with the low-pressure shaft (17) of the engine (1). The dual-rotor electrically excited dual-salient pole motor (3) is connected to the high-pressure compressor (4). The high-pressure compressor (4) and the high-pressure turbine (6) are coaxially connected through the high-pressure shaft (16). The combustion chamber (5) is located between the high-pressure compressor (4) and the high-pressure turbine (6).

[0034] like Figure 2 The dual-rotor electrically excited doubly salient pole motor (3) shown is a three-phase motor. The stator and rotor structure of the dual-rotor electrically excited doubly salient pole motor (3) includes: an outer rotor (3a), a stator (3b), and an inner rotor (3c). The outer rotor (3a) and stator (3b) constitute the first motor part of the dual-rotor electrically excited doubly salient pole motor (3), and the inner rotor (3c) and stator (3b) constitute the second motor part.

[0035] The stator (3b) of the dual-rotor electrically excited doubly salient pole motor comprises: a stator core (8), a magnetic shielding material (10), an external excitation winding (11), an external armature winding (12), an internal excitation winding (14), and an internal armature winding (15). The outer rotor (3a) of the dual-rotor electrically excited doubly salient pole motor comprises: an outer rotor core (9). The inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor comprises: an inner rotor core (13). It should be noted that the embodiment provided is a preferred solution. In practical applications, the number of pole pairs, inner diameter, and outer diameter of the inner and outer rotors and stator can also be designed according to actual conditions.

[0036] The magnetic shielding material (10) is embedded inside the stator core (8) of the dual-rotor electrically excited dual-salient pole motor. The magnetic shielding material (10) divides the stator core (8) of the dual-rotor electrically excited dual-salient pole motor into an inner region and an outer region. The inner region is close to the inner rotor core (13) of the dual-rotor electrically excited dual-salient pole motor, and the outer region is close to the outer rotor core (9) of the dual-rotor electrically excited dual-salient pole motor.

[0037] The winding positions of the external excitation winding (11) and the external armature winding (12) of the dual-rotor electrically excited dual-salient pole motor are located in the external region, while the winding positions of the internal excitation winding (14) and the internal armature winding (15) of the dual-rotor electrically excited dual-salient pole motor are located in the internal region.

[0038] Specifically, the stator core (8) of the dual-rotor electrically excited dual-salient pole motor and the outer rotor core constitute a starter generator mounted on the high-voltage shaft (16) of the engine (1). The stator core and the inner rotor core constitute a generator mounted on the low-voltage shaft (17) of the engine (1). The stator core includes an inner circumferential structure (internal area) and an outer circumferential structure (external area). Both the outer rotor core and the inner rotor core include several rotor teeth. Both the inner circumferential structure and the outer circumferential structure of the stator core include several stator poles composed of several stator teeth. The gap between adjacent stator poles forms stator slots. The armature coils wound on the stator teeth are connected according to the principle that their turn-chain magnetic flux change law is the same to form an armature winding. The armature winding includes an outer armature winding and an inner armature winding. The excitation coils wound on the stator poles are embedded in the stator slots. The excitation coils wound on each stator pole are connected in sequence to form an excitation winding. The excitation winding includes an outer excitation winding and an inner excitation winding.

[0039] In this embodiment, the outer rotor (3a) of the dual-rotor electrically excited dual salient pole motor is installed at the front end of the high-pressure compressor (4) inside the engine (1) and connected to the high-pressure shaft (16) of the engine (1).

[0040] The inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor is installed between the front end of the high-pressure compressor (4) inside the engine (1) and the rear end of the fan and the booster compressor (2), and is connected to the low-pressure shaft (17) of the engine (1); the inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor and the outer rotor (3a) of the dual-rotor electrically excited doubly salient pole motor are located on the same vertical surface;

[0041] The stator (3b) of the dual-rotor electrically excited dual-salient pole motor is connected to the housing of the engine (1) and installed between the front end of the high-pressure compressor (4) inside the engine (1) and the rear end of the fan and the booster compressor (2). The stator (3b) of the dual-rotor electrically excited dual-salient pole motor and the outer rotor (3a) of the dual-rotor electrically excited dual-salient pole motor are located on the same vertical surface.

[0042] The outer rotor (3a) and inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor have the same structure, each consisting of toothed core laminations; the inner and outer structures of the stator (3b) of the dual-rotor electrically excited doubly salient pole motor are both toothed structures; the stator (3b) of the dual-rotor electrically excited doubly salient pole motor is located outside the inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor and inside the outer rotor (3a) of the dual-rotor electrically excited doubly salient pole motor.

[0043] The stator (3b) of the dual-rotor electrically excited doubly salient pole motor has a pole number of 12 / 8, which is the same as the number of poles of the outer rotor (3a) of the dual-rotor electrically excited doubly salient pole motor. The stator (3b) of the dual-rotor electrically excited doubly salient pole motor has a pole number of 12 / 8, which is the same as the number of poles of the inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor.

[0044] In this embodiment, the external parallel power supply system includes: a bridge uncontrolled rectifier circuit, an excitation power circuit, a current distribution control circuit, a circuit breaker module, and a 270V DC bus. The bridge uncontrolled rectifier circuit includes a first bridge uncontrolled rectifier circuit and a second bridge uncontrolled rectifier circuit. The excitation power circuit includes a first excitation power circuit and a second excitation power circuit. The circuit breaker module includes a first circuit breaker and a second circuit breaker.

[0045] The positive output terminal of the first bridge uncontrolled rectifier circuit is connected to the first contact of the first circuit breaker, the second contact of the first circuit breaker serves as the positive output terminal of the external parallel power supply system, the negative output terminal of the first bridge uncontrolled rectifier circuit serves as the negative output terminal of the external parallel power supply system, and the positive and negative output terminals of the external parallel power supply system are connected to the 270V DC bus.

[0046] The input terminal of the first bridge uncontrolled rectifier circuit is connected to the armature winding terminal of the first motor part of the dual rotor electrically excited doubly salient pole motor (3);

[0047] Controlled rectifier circuits can also be used. Here, we will only use a bridge uncontrolled rectifier circuit as an example to illustrate the problem, and we will not impose any restrictions on the rectifier circuit.

[0048] The positive input terminal of the first excitation power circuit serves as the positive excitation input terminal of the external parallel power supply system channel one, and the negative input terminal of the first excitation power circuit serves as the negative excitation input terminal of the external parallel power supply system channel one. The positive and negative excitation input terminals of the external parallel power supply system channel one are connected to the external power supply 1.

[0049] The positive output terminal of the first excitation power circuit is connected to the positive terminal of the excitation winding of the first motor part of the dual-rotor electrically excited doubly salient pole motor (3), and the negative output terminal of the first excitation power circuit is connected to the negative terminal of the excitation winding of the first motor part of the dual-rotor electrically excited doubly salient pole motor (3).

[0050] The positive output terminal of the second bridge uncontrolled rectifier circuit is connected to the first contact of the second circuit breaker, the second contact of the second circuit breaker serves as the positive output terminal of the external parallel power supply system, the negative output terminal of the second bridge uncontrolled rectifier circuit serves as the negative output terminal of the external parallel power supply system, and the positive and negative output terminals of the external parallel power supply system are connected to the 270V DC bus.

[0051] The input terminal of the second bridge uncontrolled rectifier circuit is connected to the armature winding terminal of the second motor section of the dual rotor electrically excited doubly salient pole motor (3);

[0052] The positive input terminal of the second excitation power circuit serves as the positive excitation input terminal of the external parallel power supply system channel two, and the negative input terminal of the second excitation power circuit serves as the negative excitation input terminal of the external parallel power supply system channel two. The positive and negative excitation input terminals of the external parallel power supply system channel two are connected to the external power supply 2.

[0053] The positive output terminal of the second excitation power circuit is connected to the positive terminal of the excitation winding of the second motor part of the dual-rotor electrically excited doubly salient pole motor (3), and the negative output terminal of the second excitation power circuit is connected to the negative terminal of the excitation winding of the second motor part of the dual-rotor electrically excited doubly salient pole motor (3).

[0054] The excitation power circuit adopts an asymmetrical half-bridge circuit; the power switching transistors and diodes in the bridge uncontrolled rectifier circuit and the excitation power circuit are all made of high-temperature silicon carbide devices.

[0055] The external armature winding of the starter generator on the high-voltage shaft (16) of the engine (1) and the internal armature winding of the generator on the low-voltage shaft (17) of the engine (1) are respectively connected to an external rectifier circuit. The external excitation winding of the starter generator on the high-voltage shaft (16) of the engine (1) and the internal excitation winding of the generator on the low-voltage shaft (17) of the engine (1) are respectively connected to an external excitation power circuit. The dual-rotor electrically excited doubly salient pole motor (3) is controlled by an external parallel power supply system. Among them, the external rectifier circuit connected to the external armature winding of the starter generator is a bridge uncontrolled rectifier circuit. The external rectifier circuit connected to the internal armature winding of the generator is a bridge uncontrolled rectifier circuit. The external excitation power circuit is an asymmetrical half-bridge circuit.

[0056] The current distribution control circuit includes: PID-1 regulator, PID-2 regulator, PID-3 regulator, PID-4 regulator, PI-1 regulator, PI-2 regulator, node 1, node 2, node 3, node 4, node 5, node 6 and node 7;

[0057] Therefore, this embodiment also provides a parallel control method for an internally mounted high-voltage direct current generation system, including:

[0058] The first input terminal of node 1 of the current distribution control circuit is connected to the positive output terminal of the first bridge uncontrolled rectifier circuit, and the second input terminal of node 1 is connected to the positive output terminal of the second bridge uncontrolled rectifier circuit.

[0059] The output of node 1 is used as the first input of node 2 after passing through the gain K, where the value of K is in the range of [0,1]. The second input of node 2 is connected to the positive output of the first bridge uncontrolled rectifier circuit so that the negative value of the output current of the first bridge uncontrolled rectifier circuit can be used as the input of the second input of node 2.

[0060] The output of node 2 is used as the first input of node 3 after passing through the PID-3 regulator. The second input of node 3 is used as the reference voltage of the DC bus voltage. The negative value of the output voltage of the first bridge uncontrolled rectifier circuit is used as the input of the third input of node 3.

[0061] The output of node 3 is used as the first input of node 4 after passing through a PI-1 regulator. The second input of node 4 is connected to the positive output of the first excitation power circuit so that the negative value of the output current of the first excitation power circuit can be used as the input of the second input of node 4. The output of node 4 is used as the duty cycle signal after passing through a PID-1 regulator as the control signal of the power switch of the first excitation power circuit.

[0062] The output terminal of node 1 of the current distribution control circuit is used as the first input terminal of node 5 after passing through a gain of 1-K. The second input terminal of node 5 is connected to the positive output terminal of the second bridge uncontrolled rectifier circuit so that the negative value of the output current of the second bridge uncontrolled rectifier circuit can be used as the input of the second input terminal of node 5.

[0063] The output of node 5 is used as the first input of node 6 after passing through the PID-4 regulator. The second input of node 6 is the reference voltage of the DC bus voltage, so that the negative value of the output voltage of the second bridge uncontrolled rectifier circuit can be used as the input of the third input of node 6.

[0064] The output of node 6 is used as the first input of node 7 after passing through the PI-2 regulator. The second input of node 7 is connected to the positive output of the second excitation power circuit so that the negative value of the output current of the second excitation power circuit can be used as the input of the second input of node 7.

[0065] The output of node 7, after passing through the PID-2 regulator, outputs a duty cycle signal as the control signal for the power switch of the second excitation power circuit.

[0066] For example, Figure 3 The diagram shows the specific structure of the engine (1) internal external parallel power supply system of the present invention. The output terminal of node 1 of the current distribution control circuit is used as the first input terminal of node 5 after passing through the gain 1-K, where K is a number greater than or equal to 0 and less than or equal to 1. The second input terminal of node 5 is connected to the positive output terminal of the second bridge uncontrolled rectifier circuit, that is, the negative value of the output current of the second bridge uncontrolled rectifier circuit is used as the input of the second input terminal of node 5. The output terminal of node 5 is used as the first input terminal of node 6 after passing through the PID-4 regulator. The second input terminal of node 6 is the reference voltage of the DC bus voltage. The negative value of the output voltage of the second bridge uncontrolled rectifier circuit is used as the input of the third input terminal of node 6. The output terminal of node 6 is used as the first input terminal of node 7 after passing through the PI-2 regulator. The second input terminal of node 7 is connected to the positive output terminal of the second excitation power circuit, that is, the negative value of the output current of the second excitation power circuit is used as the input of the second input terminal of node 7. The output terminal of node 7 outputs the duty cycle signal after passing through the PID-2 regulator as the control signal of the power switch tube of the second excitation power circuit.

[0067] Based on the parallel control method of the engine (1) built-in high voltage DC power generation system, taking acceleration as an example, when the engine (1) is running at a constant speed, the gain K of the current distribution control circuit is K0. If the engine (1) is accelerating, the gain K is adjusted to 0.

[0068] When the gain K is adjusted from K0 to 0, that is, the input of the first input terminal of node 2 is 0, the output of node 2 is negative, that is, the first input terminal of node 3 is negative. Since the engine (1) was originally in a constant speed running state, the output voltage of the first bridge uncontrolled rectifier circuit is 270V. At the moment of adjusting the gain K, the output voltage of the first bridge uncontrolled rectifier circuit will not change, so the total input of the second input terminal of node 3 and the third input terminal of node 3 is 0, the output of node 3 is negative, that is, the input of the first input terminal of node 4 is negative, the input of the second input terminal of node 4 is also negative, that is, the output of node 4 is negative. After passing through the PID-1 regulator, the duty cycle of the output decreases, that is, the output current of the first excitation power circuit decreases, the excitation current of the first motor part of the dual rotor electrically excited dual salient pole motor (3) decreases, and the output power of the first bridge uncontrolled rectifier circuit also decreases, which is equivalent to injecting power into the high-voltage shaft (16) of the engine (1), and the speed of the high-voltage shaft (16) of the engine (1) increases.

[0069] Figure 4 The diagram shows the structure of the bridge uncontrolled rectifier circuit of the present invention, including six diodes: D1, D2, D3, D4, D5, and D6. The cathodes of diodes D1, D3, and D5 are connected to form the positive output terminal of the bridge uncontrolled rectifier circuit. The anodes of diodes D4, D6, and D2 are connected to form the negative output terminal of the bridge uncontrolled rectifier circuit. The anodes of diodes D1 and D4 are connected, the anodes of diodes D3 and D6 are connected, and the anodes of diodes D5 and D2 are connected. The anodes of diodes D1, D3, and D5 respectively form the input terminals of the bridge uncontrolled rectifier circuit.

[0070] Figure 5 This is a structural diagram of the excitation power circuit of the present invention, including two power switching transistors T7 and T8, two diodes D7 and D8, and a capacitor C3. The source of power switching transistor T7 is connected to the cathode of diode D7, and the drain of power switching transistor T8 is connected to the anode of diode D8. The connection between the drain of power switching transistor T7 and the cathode of diode D8 forms the positive input terminal of the excitation power circuit. The connection between the source of power switching transistor T8 and the anode of diode D7 forms the negative input terminal of the excitation power circuit. The source of power switching transistor T7 and the drain of power switching transistor T8 respectively form the positive output terminal and the negative output terminal of the excitation power circuit.

[0071] The built-in high-voltage DC power generation system and its parallel control method provided in this embodiment of the invention combine the starter generator and the generator into a dual-rotor electrically excited dual-salient pole motor (3), which improves the power density and the utilization rate of the internal space of the engine (1). By using an external parallel power supply system for parallel control, the power generation operation of the system is more reliable, and the dynamic performance and working efficiency of the engine (1) are improved.

[0072] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on its differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The above descriptions are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An internally mounted high-voltage direct current (HVDC) power generation system, characterized in that, include: A dual-rotor electrically excited doubly salient pole motor (3) installed inside the engine (1) and an external parallel power supply system; The stator and rotor structure of the dual-rotor electrically excited doubly salient pole motor (3) includes: an outer rotor (3a) of the dual-rotor electrically excited doubly salient pole motor, a stator (3b) of the dual-rotor electrically excited doubly salient pole motor, and an inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor; wherein, the outer rotor (3a) and the stator (3b) of the dual-rotor electrically excited doubly salient pole motor constitute the first motor part of the dual-rotor electrically excited doubly salient pole motor (3), and the inner rotor (3c) and the stator (3b) of the dual-rotor electrically excited doubly salient pole motor (3) constitute the second motor part of the dual-rotor electrically excited doubly salient pole motor (3); The components of the stator (3b) of the dual-rotor electrically excited doubly salient pole motor include: the stator core (8) of the dual-rotor electrically excited doubly salient pole motor, the magnetic shielding material (10), the external excitation winding (11) of the dual-rotor electrically excited doubly salient pole motor, the external armature winding (12) of the dual-rotor electrically excited doubly salient pole motor, the internal excitation winding (14) of the dual-rotor electrically excited doubly salient pole motor, and the internal armature winding (15) of the dual-rotor electrically excited doubly salient pole motor. The components of the outer rotor (3a) of the dual-rotor electrically excited doubly salient pole motor include: the outer rotor core (9) of the dual-rotor electrically excited doubly salient pole motor. The components of the inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor include: the inner rotor core (13) of the dual-rotor electrically excited doubly salient pole motor. The magnetic shielding material (10) is embedded inside the stator core (8) of the dual-rotor electrically excited dual-salient pole motor. The magnetic shielding material (10) divides the stator core (8) of the dual-rotor electrically excited dual-salient pole motor into an inner region and an outer region. The inner region is close to the inner rotor core (13) of the dual-rotor electrically excited dual-salient pole motor, and the outer region is close to the outer rotor core (9) of the dual-rotor electrically excited dual-salient pole motor. The winding positions of the external excitation winding (11) and the external armature winding (12) of the dual-rotor electrically excited dual-salient pole motor are located in the external region, while the winding positions of the internal excitation winding (14) and the internal armature winding (15) of the dual-rotor electrically excited dual-salient pole motor are located in the internal region.

2. The built-in high-voltage direct current power generation system according to claim 1, characterized in that, At both ends of the engine (1), a fan and a supercharger compressor (2) and a low-pressure turbine (7) are respectively installed, and the fan and the supercharger compressor (2) and the low-pressure turbine (7) are coaxially connected through a low-pressure shaft (17); The dual-rotor electrically excited dual-salient pole motor (3) is connected to the high-pressure compressor (4). The high-pressure compressor (4) and the high-pressure turbine (6) are coaxially connected through the high-pressure shaft (16). The combustion chamber (5) is located between the high-pressure compressor (4) and the high-pressure turbine (6).

3. The built-in high-voltage direct current power generation system according to claim 1 or 2, characterized in that, The outer rotor (3a) of the dual-rotor electrically excited dual salient pole motor is installed at the front end of the high-pressure compressor (4) inside the engine (1) and is connected to the high-pressure shaft (16) of the engine (1); The inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor is installed between the front end of the high-pressure compressor (4) inside the engine (1) and the rear end of the fan and the booster compressor (2), and is connected to the low-pressure shaft (17) of the engine (1); the inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor and the outer rotor (3a) of the dual-rotor electrically excited doubly salient pole motor are located on the same vertical surface; The stator (3b) of the dual-rotor electrically excited dual-salient pole motor is connected to the housing of the engine (1) and installed between the front end of the high-pressure compressor (4) inside the engine (1) and the rear end of the fan and the booster compressor (2). The stator (3b) of the dual-rotor electrically excited dual-salient pole motor and the outer rotor (3a) of the dual-rotor electrically excited dual-salient pole motor are located on the same vertical surface.

4. The built-in high-voltage direct current power generation system according to claim 3, characterized in that, The outer rotor (3a) of the dual-rotor electrically excited doubly salient pole motor and the inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor have the same structure, each consisting of toothed core laminations. The inner and outer structures of the stator (3b) of the dual-rotor electrically excited doubly salient pole motor are both toothed structures; The stator (3b) of the dual-rotor electrically excited doubly salient pole motor is located outside the inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor and inside the outer rotor (3a) of the dual-rotor electrically excited doubly salient pole motor.

5. The built-in high-voltage direct current power generation system according to claim 1, characterized in that, The stator (3b) of the dual-rotor electrically excited doubly salient pole motor has a pole number of 12 / 8, which is the same as the number of poles of the outer rotor (3a) of the dual-rotor electrically excited doubly salient pole motor.

6. The built-in high-voltage direct current power generation system according to claim 5, characterized in that, The stator (3b) of the dual-rotor electrically excited doubly salient pole motor has a pole number of 12 / 8, which is the same as the pole number of the inner rotor (3c) of the dual-rotor electrically excited doubly salient pole motor.

7. The built-in high-voltage direct current power generation system according to claim 1, characterized in that, The external parallel power supply system includes: a bridge uncontrolled rectifier circuit, an excitation power circuit, a current distribution control circuit, a circuit breaker module, and a 270V DC bus. The bridge uncontrolled rectifier circuit includes a first bridge uncontrolled rectifier circuit and a second bridge uncontrolled rectifier circuit. The excitation power circuit includes a first excitation power circuit and a second excitation power circuit. The circuit breaker module includes a first circuit breaker and a second circuit breaker. The positive output terminal of the first bridge uncontrolled rectifier circuit is connected to the first contact of the first circuit breaker, the second contact of the first circuit breaker serves as the positive output terminal of the external parallel power supply system, the negative output terminal of the first bridge uncontrolled rectifier circuit serves as the negative output terminal of the external parallel power supply system, and the positive and negative output terminals of the external parallel power supply system are connected to the 270V DC bus. The input terminal of the first bridge uncontrolled rectifier circuit is connected to the armature winding terminal of the first motor part of the dual rotor electrically excited doubly salient pole motor (3); The positive input terminal of the first excitation power circuit serves as the positive excitation input terminal of the external parallel power supply system channel one, and the negative input terminal of the first excitation power circuit serves as the negative excitation input terminal of the external parallel power supply system channel one. The positive and negative excitation input terminals of the external parallel power supply system channel one are connected to the external power supply 1. The positive output terminal of the first excitation power circuit is connected to the positive terminal of the excitation winding of the first motor part of the dual-rotor electrically excited doubly salient pole motor (3), and the negative output terminal of the first excitation power circuit is connected to the negative terminal of the excitation winding of the first motor part of the dual-rotor electrically excited doubly salient pole motor (3).

8. The built-in high-voltage direct current power generation system according to claim 7, characterized in that, The positive output terminal of the second bridge uncontrolled rectifier circuit is connected to the first contact of the second circuit breaker, the second contact of the second circuit breaker serves as the positive output terminal of the external parallel power supply system, the negative output terminal of the second bridge uncontrolled rectifier circuit serves as the negative output terminal of the external parallel power supply system, and the positive and negative output terminals of the external parallel power supply system are connected to the 270V DC bus. The input terminal of the second bridge uncontrolled rectifier circuit is connected to the armature winding terminal of the second motor section of the dual rotor electrically excited doubly salient pole motor (3); The positive input terminal of the second excitation power circuit serves as the positive excitation input terminal of the external parallel power supply system channel two, and the negative input terminal of the second excitation power circuit serves as the negative excitation input terminal of the external parallel power supply system channel two. The positive and negative excitation input terminals of the external parallel power supply system channel two are connected to the external power supply 2. The positive output terminal of the second excitation power circuit is connected to the positive terminal of the excitation winding of the second motor part of the dual-rotor electrically excited doubly salient pole motor (3), and the negative output terminal of the second excitation power circuit is connected to the negative terminal of the excitation winding of the second motor part of the dual-rotor electrically excited doubly salient pole motor (3).

9. A parallel control method for the built-in high-voltage direct current generator system as described in claim 8, characterized in that, The built-in high-voltage DC power generation system includes: a dual-rotor electrically excited double-salient pole motor (3) installed inside the engine (1) and an external parallel power supply system; the external parallel power supply system includes: a bridge uncontrolled rectifier circuit, an excitation power circuit, a current distribution control circuit, a circuit breaker module and a 270V DC bus. The current distribution control circuit includes: PID-1 regulator, PID-2 regulator, PID-3 regulator, PID-4 regulator, PI-1 regulator, PI-2 regulator, node 1, node 2, node 3, node 4, node 5, node 6 and node 7; The first input terminal of node 1 of the current distribution control circuit is connected to the positive output terminal of the first bridge uncontrolled rectifier circuit, and the second input terminal of node 1 is connected to the positive output terminal of the second bridge uncontrolled rectifier circuit. The output of node 1 is used as the first input of node 2 after passing through the gain K, where the value of K is in the range of [0,1]. The second input of node 2 is connected to the positive output of the first bridge uncontrolled rectifier circuit so that the negative value of the output current of the first bridge uncontrolled rectifier circuit can be used as the input of the second input of node 2. The output of node 2 is used as the first input of node 3 after passing through the PID-3 regulator. The second input of node 3 is used as the reference voltage of the DC bus voltage. The negative value of the output voltage of the first bridge uncontrolled rectifier circuit is used as the input of the third input of node 3. The output of node 3 is used as the first input of node 4 after passing through a PI-1 regulator. The second input of node 4 is connected to the positive output of the first excitation power circuit so that the negative value of the output current of the first excitation power circuit can be used as the input of the second input of node 4. The output of node 4 is used as the duty cycle signal after passing through a PID-1 regulator as the control signal of the power switch of the first excitation power circuit.

10. The parallel control method according to claim 9, characterized in that, The output terminal of node 1 of the current distribution control circuit is used as the first input terminal of node 5 after passing through a gain of 1-K. The second input terminal of node 5 is connected to the positive output terminal of the second bridge uncontrolled rectifier circuit so that the negative value of the output current of the second bridge uncontrolled rectifier circuit can be used as the input of the second input terminal of node 5. The output of node 5 is used as the first input of node 6 after passing through the PID-4 regulator. The second input of node 6 is the reference voltage of the DC bus voltage, so that the negative value of the output voltage of the second bridge uncontrolled rectifier circuit can be used as the input of the third input of node 6. The output of node 6 is used as the first input of node 7 after passing through the PI-2 regulator. The second input of node 7 is connected to the positive output of the second excitation power circuit so that the negative value of the output current of the second excitation power circuit can be used as the input of the second input of node 7. The output of node 7, after passing through the PID-2 regulator, outputs a duty cycle signal as the control signal for the power switch of the second excitation power circuit.

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