Hybrid excitation generator self-excitation system and method with reactive power optimization function

Abstract

The embodiment of the application discloses a hybrid excitation generator self-excitation system and method with reactive power optimization function, relates to the technical field of motor excitation, and can realize the reactive power optimization of the motor interior while realizing the self-excitation of the hybrid excitation generator, so as to improve the power output capacity of the hybrid excitation generator under wide-speed-domain operation. The self-excitation system is suitable for a parallel magnetic circuit type hybrid excitation generator, and the system comprises a direct-current excitation winding (3), a reactive power optimization winding (5), a controllable rectifier circuit, a DC / DC converter circuit, an excitation control unit, voltage and current sensors and the like. Specifically, the reactive power compensation winding connected with the armature winding is introduced in the existing parallel magnetic circuit type hybrid excitation generator, the active power and the reactive power distribution in the reactive power compensation winding are controlled through the controllable rectifier circuit, and the system self-excitation and the generator reactive power optimization are realized at the same time. The application further discloses a control method of the system.

Description

Technical Field

[0001] This invention relates to the field of motor excitation technology, and in particular to a self-excitation system and method for a hybrid excitation generator with reactive power optimization function. Background Technology

[0002] Hybrid excitation motors combine permanent magnet and electric excitation sources, offering advantages such as convenient magnetic field adjustment, high power density, and high reliability, making them promising for applications in aviation power systems. As independent power systems decoupled from the main power grid, aviation power systems do not rely on external power sources; the electric excitation power required by their generators is provided by the system itself. With the advancement of aviation electrification, aircraft power system capacity has significantly increased, and generators need to meet wide-speed operation requirements, leading to a corresponding increase in the excitation power required by hybrid excitation motors. This exacerbates the problems faced by existing self-excited systems: for power systems using auxiliary exciters, increased excitation power leads to increased exciter capacity, affecting generator size, weight, and power density; for self-excited power systems, power can be extracted from the generator output as electric excitation power, but the increased extracted power reduces system output capacity, affects system stability, and makes voltage build-up difficult.

[0003] Therefore, how to achieve self-excitation of the hybrid excitation generator while simultaneously optimizing its internal reactive power, thereby improving the power output capability of the hybrid excitation generator under wide speed range operation, has become a problem that needs further research. Summary of the Invention

[0004] The embodiments of the present invention provide a self-excitation system and method for a hybrid excitation generator with reactive power optimization function, which can optimize the internal reactive power of the hybrid excitation generator while realizing self-excitation of the hybrid excitation generator, thereby improving the power output capability of the hybrid excitation generator under wide speed range operation.

[0005] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0006] In a first aspect, the embodiments of the present invention provide a method, a generator, and a self-excitation system; specifically, the generator may be a hybrid excitation generator, and the self-excitation system is a hybrid excitation generator self-excitation system with reactive power optimization function.

[0007] The generator includes: an electrically excited motor stator (1), an electrically excited motor rotor (2), a permanent magnet motor stator (6), a permanent magnet motor rotor (7), a permanent magnet motor permanent magnet (8), and an electrically excited armature winding W. a1 (4) and permanent magnet armature winding W a2(9); wherein, the generator is equipped with a position sensor for detecting the rotor position θ of the electrically excited motor rotor (2);

[0008] Electrically excited armature winding W a1 (4) Connect the permanent magnet armature winding W a2 (9) Permanent magnet armature winding W a2 (9) Connect the uncontrolled rectifier circuit in the generator, and the voltage sensor H udc Used to detect the output voltage U of the uncontrolled rectifier circuit dc ;

[0009] The self-excitation system includes: a DC excitation winding W f (3) Reactive power optimization winding (5)W a3 Voltage sensor, current sensor group, controllable rectifier circuit and excitation control unit;

[0010] The controllable rectifier circuit uses a reactive power optimization winding W a3 (5) Connect the generator;

[0011] The current sensor group includes at least three current sensors, wherein the first current sensor H ib Second current sensor H ic They are used to detect reactive power optimization winding W respectively. a3 (5) The two-phase current i b and i c Third current sensor H if Used to detect DC excitation winding W f (3) Current I f .

[0012] Among them, the controllable rectifier circuit directly supplies power to the DC excitation winding W. f (3) Power supply; the output voltage of the controllable rectifier circuit is connected to the DC excitation winding W f (3) When the required voltage level is matched, the DC / DC converter circuit can be omitted. Optionally, the self-excited system also includes: 1: a DC / DC converter circuit; DC excitation winding W f (3) Connect the DC / DC converter circuit, which is connected to the controllable rectifier circuit.

[0013] Specifically, reactive power optimization winding W a3 (5) The input terminal is connected to the electromagnetic armature winding W. a1 (4) Output terminal; reactive power optimization winding W a3 (5) The output terminal of the circuit passes through the controllable rectifier circuit and the DC / DC converter circuit in sequence, and supplies power to the DC excitation winding W. f(3) Power supply. The generator is a parallel magnetic circuit type hybrid excitation generator. The permanent magnet magnetic field of this type of generator is generated by permanent magnets, and the electric excitation magnetic field is generated by the DC excitation winding W. f (3) This type of motor's armature winding consists of a permanent magnet armature winding W with a chain of permanent magnet magnetic fields. a2 (9), and the electrically excited armature winding W of the chain-linked electrically excited magnetic field. a1 (4) Connected in series.

[0014] Reactive power optimization winding W a3 (5) input terminal, and the permanent magnet armature winding W of the parallel magnetic circuit type hybrid excitation generator. a2 (9) input terminal, electromagnetic armature winding W a1 (4) is connected to the output terminal; reactive power optimization winding W a3 The output terminal of (5) is connected to the input terminal of the controllable rectifier circuit, and the output terminal of the controllable rectifier circuit supplies power to the DC excitation winding W via the DC / DC converter circuit. f (3) Power supply; reactive power optimization winding W a3 (5) The input terminal of the permanent magnet armature winding W a2 (9) Output terminal and electromagnetic armature winding W a1 (4) The output terminal is the same as the terminal.

[0015] Reactive power optimization winding W a3 (5) Integrated into the permanent magnet motor stator (6) of the parallel magnetic circuit type hybrid excitation generator, and connected with the permanent magnet armature winding W a2 (9) They share the same motor magnetic circuit and are coupled with a permanent magnet magnetic field. The controllable rectifier circuit is used to adjust the reactive power optimization winding W. a3 The magnitude and phase of the current in (5) thus optimize the reactive power winding W. a3 (5) Control the generated active and reactive power; among which, the reactive power optimization winding W a3 (5) Both active and reactive power generated are provided by the hybrid excitation generator through electromechanical energy conversion. Among them, the reactive power optimization winding W a3 The active power generated in (5) is supplied to the DC excitation winding W. f (3) The system does not require an external power source to provide DC excitation power, thus achieving self-excitation of the hybrid excitation generator system.

[0016] Reactive power optimization winding W a3 The reactive power generated in (5) is adjusted to capacitive reactive power and input into the armature winding of the hybrid excitation generator, that is, the reactive power is input into the permanent magnet armature winding W. a2 (9) and the electrically excited armature winding W a1 (4) thereby optimizing the internal inductive reactive power of the hybrid excitation generator.

[0017] Secondly, the method provided by the embodiments of the present invention includes:

[0018] S1. Collect generator operating parameters, including: through the excitation control unit and through voltage sensor H. udc Detecting the output voltage U of the uncontrolled rectifier circuit dc ; and, by detecting the reactive power optimization winding W through a current sensor group a3 (5) Two-phase current i b and i c and detection of DC excitation winding W f (3) Current I f ; and, through a position sensor installed in the generator, the rotor position signal θ of the electrically excited motor rotor (2) is detected;

[0019] S2, current signal i b i c The reactive power optimized winding W is obtained after coordinate transformation of the position signal θ. a3 (5) d-axis current signal I d and q-axis current signal I q The detected voltage signal U at the output terminal of the uncontrolled rectifier circuit dc With the given voltage signal U of the power generation system dcref After comparison, the reactive power optimized winding W is generated through the PI stage. a3 (5) q-axis current command signal I qref Then I qref with I q After comparison, the q-axis reference voltage signal V is obtained through a PI circuit. sqref

[0020] S3, I f i b and i c After inputting the allocation strategy, the reactive power optimized winding W is obtained. a3 (5) d-axis current command signal I dref Then I dref with I d After comparison, the d-axis reference voltage signal V is obtained through a PI circuit. sdref ;

[0021] S4, θ, V sdref and V sqref After coordinate transformation and SVPWM, the chopping signal PWM of the controllable rectifier circuit is obtained. T1～T6 .

[0022] If the control objective is to achieve electrical density balance of the motor windings, then it includes: via i bi c and I f Calculate reactive power optimization winding W a3 (5) Current density and DC excitation winding W f (3) Current density; when the reactive power optimization winding W a3 (5) The current density is less than that of the DC excitation winding W f When the current density of (3) is reached, the I output of the allocation strategy circuit is increased. dref At the same time, enhance the reactive power optimization winding W a3 (5) Injected reactive power; when the reactive power optimization winding W a3 (5) The current density is greater than that of the DC excitation winding W f (3) When the current density is such that the I output of the allocation strategy is reduced, the current density of the allocation strategy is reduced. dref Alternatively, if the control objective is to minimize the copper loss of the motor, it includes: establishing the minimum copper loss operating conditions of the generator under different operating conditions corresponding to I0. dref A lookup table is used and stored in the excitation control unit. In the allocation strategy stage, the lookup table is called to output the I value corresponding to the minimum copper loss operation of the generator. dref .

[0023] The self-excitation system and method for a hybrid excitation generator with reactive power optimization provided in this invention can simultaneously achieve self-excitation and internal reactive power optimization of the hybrid excitation generator, thereby improving the power output capability of the hybrid excitation generator under wide speed range operation. Specifically, a reactive power compensation winding connected to the armature winding is introduced into the existing parallel magnetic circuit type hybrid excitation generator. The distribution of active and reactive power in the reactive power compensation winding is controlled by a controllable rectifier circuit, thereby achieving both system self-excitation and generator reactive power optimization. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the overall architecture provided for an embodiment of the present invention;

[0026] Figure 2 This is a schematic cross-sectional view of a parallel magnetic circuit type hybrid excitation generator according to an embodiment of the present invention. Figure 1 The generator scheme embodied in it;

[0027] Figure 3 This is a control block diagram of the self-excitation system provided in the embodiments of the invention;

[0028] Figure 4 This is a structural diagram of the controllable rectifier circuit in this invention;

[0029] Figure 5 This is a structural diagram of the uncontrolled rectifier circuit in this invention;

[0030] Figure 6 This is a structural diagram of the DC / DC converter circuit in this invention;

[0031] 1-Stator of electrically excited motor, 2-Rotor of electrically excited motor, 3-DC excitation winding, 4-Electrically excited armature winding, 5-Reactive power optimization winding, 6-Stator of permanent magnet motor, 7-Rotor of permanent magnet motor, 8-Permanent magnet of permanent magnet motor, 9-Permanent magnet armature winding, 10-Housing, 11-End cover, 12-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 self-excitation system for a hybrid excitation generator with reactive power optimization capabilities, such as... Figure 1As shown, the DC excitation winding W f (3) Reactive power optimization winding W a3 (5) It consists of a controllable rectifier circuit, a DC / DC converter circuit, an excitation control unit, and multiple voltage and current sensors.

[0034] The self-excitation system of the hybrid excitation generator with reactive power optimization function is applicable to the type of hybrid excitation generator of parallel magnetic circuit type, such as... Figure 2 As shown, the permanent magnet magnetic field of this type of motor is generated by the permanent magnet (8) of the permanent magnet motor, and the electric excitation magnetic field is generated by the DC excitation winding W. f (3) This type of motor's armature winding consists of a permanent magnet armature winding W with a chain of permanent magnet magnetic fields. a2 (9) and the excitation armature winding W of the chain-linked excitation magnetic field a1 (4) Connected in series;

[0035] In the self-excitation system of the hybrid excitation generator with reactive power optimization function, the reactive power optimization winding W a3 (5) Input terminal and parallel magnetic circuit type hybrid excitation generator permanent magnet armature winding W a2 (9) Input terminal, electromagnetic armature winding W a1 (4) Connect the output terminal to the reactive power optimization winding W. a3 (5) The output terminal is connected to the input terminal of the controllable rectifier circuit. The output terminal of the controllable rectifier circuit supplies power to the DC excitation winding W through the DC / DC converter circuit. f (3) Power supply;

[0036] The reactive power optimization winding W a3 (5) Input terminal and parallel magnetic circuit type hybrid excitation generator permanent magnet armature winding W a2 (9) Output terminal, electromagnetic armature winding W a1 (4) The output terminal is the same name as the terminal;

[0037] The reactive power optimization winding W a3 (5) Integrated into the stator (6) of the permanent magnet motor of the parallel magnetic circuit type hybrid excitation generator, and connected with the permanent magnet armature winding W of the parallel magnetic circuit type hybrid excitation generator. a2 (9) Shared motor magnetic circuit and coupled permanent magnet magnetic field;

[0038] In this embodiment, the reactive power optimization winding W is adjusted by a controllable rectifier circuit. a3 (5) The magnitude and phase of the current can be flexibly controlled to generate active and reactive power; wherein, the reactive power optimization winding W a3 (5) Both active and reactive power generated are provided by the hybrid excitation generator through electromechanical energy conversion; reactive power optimization winding W a3 The active power generated in (5) is supplied to the DC excitation winding W.f (3) No external power supply is required to provide DC excitation power, thus achieving self-excitation of the hybrid excitation generator system; reactive power optimization winding W a3 The reactive power generated in (5) is adjusted to capacitive reactive power and injected into the armature winding of the hybrid excitation generator through circuit connection, thereby optimizing the inductive reactive power inside the hybrid excitation generator.

[0039] In this embodiment, when the output voltage of the controllable rectifier circuit is related to the DC excitation winding W... f (3) When the required voltage level is matched, the DC / DC converter circuit can be eliminated, and the controllable rectifier circuit can directly supply power to the DC excitation winding W. f (3) Power supply;

[0040] This invention also provides a self-excitation method for a hybrid excitation generator with reactive power optimization, the system block diagram and control block diagram are as follows: Figure 1 , Figure 3 As shown. Specifically, the excitation control unit in the self-excitation system of the hybrid excitation generator with reactive power optimization function uses voltage sensor H udc Detecting the output voltage U of the uncontrolled rectifier circuit dc Through current sensor H ib H ic H if Detecting the two-phase current i of the reactive power optimization winding (5) b i c DC excitation winding (3) current I f The rotor position θ of the hybrid excitation motor is detected by a rotor position sensor.

[0041] The excitation control unit will detect the two-phase current signal i of the reactive power optimization winding (5). b i c The rotor position signal θ of the hybrid excitation motor is transformed by coordinate transformation to obtain the d-axis current signal I in the reactive power optimization winding (5). d and q-axis current signal I q The detected voltage signal U at the output of the uncontrolled rectifier circuit dc With the given voltage signal U of the power generation system dcref After comparison, the reactive power optimization winding (5) q-axis current command signal I is generated through the PI circuit. qref The reactive power optimization winding (5) q-axis current given signal I qref The q-axis current signal I obtained by detection and transformation in the reactive power optimization winding (5) q After comparison, the q-axis reference voltage signal V is obtained through a PI circuit. sqref .

[0042] Detected excitation winding current signal I f The two-phase current signal i of the reactive power optimization winding (5) was detected. b i c After inputting the allocation strategy, the reactive power optimization winding (5) d-axis current command signal I is obtained. dref , reactive power optimization winding (5) d-axis current given signal I dref The d-axis current signal I obtained by detection and transformation in the reactive power optimization winding (5) d After comparison, the d-axis reference voltage signal V is obtained through a PI circuit. sdref .

[0043] The detected rotor position signal θ and d-axis reference voltage signal V of the hybrid excitation motor sdref and q-axis reference voltage signal V sqref After coordinate transformation and SVPWM, the controllable rectifier circuit chopper signal PWM is obtained. T1～T6 .

[0044] The duty cycle D of the DC / DC converter circuit is a constant value, determined by the output voltage level of the controllable rectifier circuit and the DC excitation winding W. f (3) The required voltage level is determined by the motor parameters.

[0045] In the above-mentioned control method for a hybrid excitation generator self-excitation system with reactive power optimization, the DC excitation winding W can be controlled through the allocation strategy stage. f (3) With reactive power optimization winding W a3 (5) Current distribution to achieve different control objectives, such as motor winding electrical density balance and minimum motor copper loss.

[0046] Taking the target of motor winding electrical density balance as an example, the two-phase current signal i of the reactive power optimization winding (5) is detected. b i c DC excitation winding (3) current signal I f The reactive power optimization winding W can be calculated. a3 (5) Current density and DC excitation winding W f (3) Current density. When the reactive power optimization winding W a3 (5) The current density is less than that of the DC excitation winding W f When the current density of (3) is high, the reactive power optimization winding (5) d-axis current given signal I of the distribution strategy stage is increased. dref The reactive power injected into the reactive power optimization winding (5) is enhanced, and the power factor of the hybrid excitation generator is improved. At this time, the output voltage U of the uncontrolled rectifier circuit is... dc Increase, detected output voltage signal U of the uncontrolled rectifier circuit dcWith the given voltage signal U of the power generation system dcref After comparison, the reactive power optimization winding (5) q-axis current given signal I will be reduced. qref To reduce the active power output of the controllable rectifier circuit, that is, to reduce the excitation current I on the DC excitation winding (3). f Similarly, when the reactive power optimization winding W... a3 (5) The current density is greater than that of the DC excitation winding W f When the current density of (3) is low, the given reactive power optimization winding (5) d-axis current given signal I of the distribution strategy output is reduced. dref .

[0047] Taking the goal of minimizing motor copper loss as an example, the reactive power optimization winding (5) d-axis current given signal I is established for the motor under different operating conditions when the minimum copper loss is achieved. dref The lookup table is stored in the excitation control unit. The allocation strategy stage outputs the reactive power optimization winding (5) d-axis current given signal I corresponding to the minimum copper loss operation of the motor by calling the lookup table. dref .

[0048] like Figure 4 The diagram shown is a controllable rectifier circuit structure diagram of a self-excited system and control method for a hybrid excitation generator with reactive power optimization function. It includes six power transistors: power transistor T11, power transistor T12, power transistor T13, power transistor T14, power transistor T15 and power transistor T16; six diodes: diode D11, diode D12, diode D13, diode D14, diode D15 and diode D16; and capacitor C1.

[0049] like Figure 5 The diagram shown is an uncontrolled rectifier circuit structure diagram of a self-excitation system and control method for a hybrid excitation generator with reactive power optimization function, including six diodes: diode D21, diode D22, diode D23, diode D24, diode D25, and diode D26.

[0050] like Figure 6 The diagram shown is a DC / DC converter circuit structure diagram of a self-excitation system and control method for a hybrid excitation generator with reactive power optimization function, including a fully controlled power device V, a freewheeling diode VD, an inductor L, and a resistor R.

[0051] The self-excitation system and control method of the hybrid excitation generator with reactive power optimization provided in this invention can achieve internal reactive power optimization of the hybrid excitation generator while realizing self-excitation, thereby improving the power output capability of the hybrid excitation generator under wide speed range operation. Specifically, a reactive power compensation winding connected to the armature winding is introduced into the existing parallel magnetic circuit type hybrid excitation generator. The active and reactive power distribution in the reactive power compensation winding is controlled by a controllable rectifier circuit, thereby realizing both system self-excitation and generator reactive power optimization.

[0052] 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. A self-excited hybrid excitation generator system with reactive power optimization function, characterized in that, The system includes: a generator and a self-excitation system; The generator includes: an electrically excited motor stator (1), an electrically excited motor rotor (2), a permanent magnet motor stator (6), a permanent magnet motor rotor (7), a permanent magnet motor permanent magnet (8), and an electrically excited armature winding W. a1 (4) and permanent magnet armature winding W a2 (9); wherein, the generator is equipped with a position sensor for detecting the rotor position θ of the electrically excited motor rotor (2); Electrically excited armature winding W a1 (4) Connect the permanent magnet armature winding W a2 (9) Permanent magnet armature winding W a2 (9) Connect the uncontrolled rectifier circuit in the generator, voltage sensor H udc Used to detect the output voltage U of the uncontrolled rectifier circuit dc ; The self-excitation system includes: a DC excitation winding W f (3) Reactive power optimization winding (5) W a3 Voltage sensor, current sensor group, controllable rectifier circuit and excitation control unit; The controllable rectifier circuit uses a reactive power optimization winding W a3 (5) Connect the generator; The current sensor group includes at least three current sensors, wherein the first current sensor H ib Second current sensor H ic They are used to detect reactive power optimization winding W respectively. a3 (5) Two-phase current i b and i c Third current sensor H if Used to detect DC excitation winding W f (3) Current I f Among them, the electric excitation magnetic field is generated by the DC excitation winding W. f (3) To produce; The self-excitation system also includes: a DC / DC converter circuit; and a DC excitation winding W. f (3) Connect the DC / DC converter circuit, which is connected to the controllable rectifier circuit; Reactive power optimization winding W a3 (5) The input terminal is connected to the electrically excited armature winding W. a1 (4) Output terminal; reactive power optimization winding W a3 (5) The output terminal of the circuit passes through the controllable rectifier circuit and the DC / DC converter circuit in sequence, and supplies power to the DC excitation winding W. f (3) Power supply; Reactive power optimization winding W a3 (5) input terminal, and the permanent magnet armature winding W a2 (9) is connected to the input terminal; reactive power optimization winding W a3 (5) Input terminal, permanent magnet armature winding W a2 (9) Output terminal, electromagnetic armature winding W a1 (4) The output terminal is the same name terminal.

2. The system according to claim 1, characterized in that, The controllable rectifier circuit directly supplies power to the DC excitation winding W. f (3) Power supply; The output voltage of the controllable rectifier circuit is related to the DC excitation winding W. f (3) The required voltage level is matched.

3. The system according to claim 1, characterized in that, The generator is a parallel magnetic circuit type hybrid excitation generator. The armature winding of this type of generator consists of a permanent magnet armature winding W with a chained permanent magnet magnetic field. a2 (9), and the armature winding W of the electric excitation magnetic field of the chain chain. a1 (4) Series connection.

4. The system according to claim 3, characterized in that, Reactive power optimization winding W a3 (5) Integrated into the permanent magnet motor stator (6) of the parallel magnetic circuit type hybrid excitation generator, and connected with the permanent magnet armature winding W a2 (9) They share the same motor magnetic circuit and are coupled with permanent magnet magnetic field.

5. The system according to claim 3, characterized in that, The controllable rectifier circuit is used to adjust the reactive power optimization winding W. a3 The magnitude and phase of the current in (5) are used to optimize the reactive power winding W. a3 (5) Control the generated active and reactive power; Among them, the reactive power optimization winding W a3 The active power generated in (5) is supplied to the DC excitation winding W. f (3); Reactive power optimization winding W a3 The reactive power generated in (5) is adjusted into capacitive reactive power and input into the permanent magnet armature winding W. a2 (9) and the electrically excited armature winding W a1 (4).

6. A self-excitation method for a hybrid excitation generator with reactive power optimization function, said method being based on the self-excitation system of the hybrid excitation generator according to any one of claims 1-5, characterized in that, The method includes: S1. Collect generator operating parameters, including: through the excitation control unit and through voltage sensor H. udc Detecting the output voltage U of the uncontrolled rectifier circuit dc ; and, by detecting the reactive power optimization winding W through a current sensor group a3 (5) Two-phase current i b and i c and detection of DC excitation winding W f (3) Current I f ; and, through the position sensor installed in the generator, the rotor position signal θ of the electrically excited motor rotor (2) is detected; S2, current signal i b i c The reactive power optimized winding W is obtained after coordinate transformation of the position signal θ. a3 (5) d-axis current signal I d and q-axis current signal I q The detected voltage signal U at the output terminal of the uncontrolled rectifier circuit dc With the given voltage signal U of the power generation system dcref After comparison, the reactive power optimized winding W is generated through the PI stage. a3 (5) q-axis current command signal I qref Then I qref with I q After comparison, the q-axis reference voltage signal V is obtained through a PI circuit. sqref ; S3, I f i b and i c After inputting the allocation strategy, the reactive power optimized winding W is obtained. a3 (5) d-axis current command signal I dref Then I dref with I d After comparison, the d-axis reference voltage signal V is obtained through a PI circuit. sdref ; S4, θ, V sdref and V sqref After coordinate transformation and SVPWM, the chopping signal PWM of the controllable rectifier circuit is obtained. T1~T6 .

7. The method according to claim 6, characterized in that, If the control objective is to achieve electrical density balance of the motor windings, then it includes: via i b i c and I f Calculate reactive power optimization winding W a3 (5) Current density and DC excitation winding W f (3) Current density; when the reactive power optimization winding W a3 (5) The current density is less than that of the DC excitation winding W f When the current density of (3) is such that the I output of the allocation strategy is increased, the current density of the allocation strategy is increased. dref This enhances the reactive power optimization winding W a3 (5) Injected reactive power; when the reactive power optimization winding W a3 (5) The current density is greater than that of the DC excitation winding W f (3) When the current density is such that the I output of the allocation strategy is reduced, the current density of the allocation strategy is reduced. dref ; Alternatively, if the control objective is to minimize the copper loss of the motor, it includes: establishing the minimum copper loss operating conditions of the generator under different operating conditions corresponding to I0. dref A lookup table is used and stored in the excitation control unit. In the allocation strategy stage, the lookup table is called to output the I corresponding to the minimum copper loss operation of the generator. dref .

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