Power generation device, power generation control method, program product, power system, and vehicle

Abstract

The invention discloses a power generation device, a power generation control method, a program product, a power system and a vehicle, and belongs to the technical field of motors. The power generation device comprises: an electrically excited synchronous motor; the alternating current side of the first power conversion circuit is electrically connected with the output side of the electrically excited synchronous motor; and the output end of the energy storage unit is used for supplying power. The electric energy output by the electrically excited synchronous motor is rectified by the first power conversion circuit and then stored in the energy storage unit, and the energy storage unit can store redundant energy or release the stored energy for power supply so as to maintain a continuous and stable DC voltage and improve the applicability of the electrically excited synchronous motor in an actual power supply scene.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric machines, and particularly relates to a power generation device, a power generation control method, a program product, a power system, and a vehicle. BACKGROUND

[0002] In the application of the existing electrically excited synchronous motor, the input side is usually connected to a driving electrically excited synchronous motor rotor to realize electric energy conversion. However, due to the dynamic fluctuation of the rotor speed during the operation of the motor, the output voltage of the electrically excited synchronous motor fluctuates, which limits its applicability in actual power supply scenarios to some extent. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a power generation device, a power generation control method, a program product, a power system, and a vehicle. The energy storage unit can store excess energy or release stored energy for power supply to maintain a continuous and stable direct current voltage, thereby improving the applicability of the electrically excited synchronous motor in actual power supply scenarios.

[0004] In a first aspect, the present application provides a power generation device, comprising:

[0005] an electrically excited synchronous motor;

[0006] a first power conversion circuit, an alternating current side of the first power conversion circuit being electrically connected to an output side of the electrically excited synchronous motor;

[0007] an energy storage unit, the energy storage unit being electrically connected to a direct current side of the first power conversion circuit, and an output end of the energy storage unit being used for power supply.

[0008] According to the power generation device of the present application, the electric energy output by the electrically excited synchronous motor is rectified by the first power conversion circuit and stored in the energy storage unit. The energy storage unit can store excess energy or release stored energy for power supply to maintain a continuous and stable direct current voltage, thereby improving the applicability of the electrically excited synchronous motor in actual power supply scenarios.

[0009] According to an embodiment of the present application, the output end of the energy storage unit comprises a first direct current output end, and the power generation device further comprises:

[0010] a second power conversion circuit, a direct current side of the second power conversion circuit being electrically connected to the first direct current output end of the energy storage unit, and an alternating current side of the second power conversion circuit being adapted to be electrically connected to a load and / or a power grid.

[0011] According to an embodiment of the present application, the direct current side of the second power conversion circuit and the direct current side of the first power conversion circuit are electrically connected.

[0012] According to an embodiment of the present application, the second power conversion circuit comprises:

[0013] an inverter circuit, a DC side of the inverter circuit being electrically connected to the first DC output terminal of the energy storage unit;

[0014] a filter circuit, an input side of the filter circuit being electrically connected to an AC side of the inverter circuit, the input side of the filter circuit being adapted to be electrically connected to the load and / or the power grid.

[0015] According to an embodiment of the present application, the inverter circuit comprises a three-phase full-bridge circuit, a DC side of the three-phase full-bridge circuit being electrically connected to the first DC output terminal of the energy storage unit, an AC side of the three-phase full-bridge circuit being electrically connected to the input side of the filter circuit.

[0016] According to an embodiment of the present application, the filter circuit comprises:

[0017] a filter inductor, a first terminal of the filter inductor being electrically connected to the AC side of the inverter circuit;

[0018] a filter capacitor, a first terminal of the filter capacitor being electrically connected to a second terminal of the filter inductor, a second terminal of the filter capacitor being electrically connected to the ground node.

[0019] According to an embodiment of the present application, the output terminal of the energy storage unit comprises a second DC output terminal, the second DC output terminal being electrically connected to the brushless excitation system of the electrically-excited synchronous motor.

[0020] According to an embodiment of the present application, the power generation device further comprises:

[0021] a DC conversion circuit, an input side of the DC conversion circuit being electrically connected to the second DC output terminal of the energy storage unit, an output side of the DC conversion circuit being electrically connected to the brushless excitation system of the electrically-excited synchronous motor.

[0022] According to an embodiment of the present application, the first power conversion circuit comprises a full-bridge rectifier circuit.

[0023] According to an embodiment of the present application, the input side of the electrically-excited synchronous motor is connected to a turbine or a flywheel.

[0024] According to an embodiment of the present application, the turbine or the flywheel is connected to a rotor of the electrically-excited synchronous motor to drive the rotor of the electrically-excited synchronous motor to rotate.

[0025] In a second aspect, the present application provides a power generation control method, applied to the power generation device described above, the method comprising:

[0026] obtaining a first sampling current at an output side of the electrically-excited synchronous motor and a bus voltage at a DC side of the first power conversion circuit;

[0027] generating a first PWM signal based on the first sampling current and the bus voltage;

[0028] The first power conversion circuit is driven by the first PWM signal.

[0029] According to the power generation control method, the electric energy output by the electrically excited synchronous motor is rectified by the first power conversion circuit and stored in the energy storage unit. The energy storage unit can store excess energy or release stored energy for power supply, so as to maintain continuous and stable DC voltage and improve the applicability of the electrically excited synchronous motor in actual power supply scenarios.

[0030] According to an embodiment of the present application, the first PWM signal is generated based on the first sampling current and the bus voltage, comprising:

[0031] The first sampling current is sequentially subjected to Clark coordinate transformation and Park coordinate transformation to determine the actual currents id and iq of the first sampling current in the dq axis;

[0032] The difference between the d-axis given current id* and the d-axis actual current id is subjected to proportional integral operation to determine the expected bus voltage Ua in the a-axis;

[0033] The difference between the q-axis given current iq* and the q-axis actual current iq is subjected to proportional integral operation to determine the expected bus voltage Ub in the β-axis;

[0034] The first PWM signal is generated by pulse width modulation based on the voltage Ua and the voltage Ub.

[0035] According to an embodiment of the present application, before determining the expected bus voltage Ua in the a-axis by proportional integral operation based on the difference between the d-axis given current id* and the d-axis actual current id, the method further comprises:

[0036] The d-axis given current id* is determined by proportional integral operation based on the bus voltage and a given value of the bus voltage.

[0037] According to an embodiment of the present application, the power generation device further comprises a second power conversion circuit, the direct current side of the second power conversion circuit is electrically connected to the first direct current output end of the energy storage unit, and the alternating current side of the second power conversion circuit is adapted to be electrically connected to the load and / or the power grid; the method further comprises:

[0038] In the case that the working mode of the power generation device is to supply power to the power grid, the second PWM signal is generated based on the VSG control algorithm to drive the second power conversion circuit;

[0039] In the case that the working mode of the power generation device is to supply power to the load, the third PWM signal is generated based on the proportional integral control algorithm to drive the second power conversion circuit.

[0040] According to one embodiment of the present application, in the case of the working mode of the power generation device being to supply power to the power grid, a second PWM signal is generated based on a VSG control algorithm to drive the second power conversion circuit, comprising:

[0041] The actual value of active power and the actual value of reactive power output by the second power conversion circuit are determined based on the second sampling current of the AC side of the second power conversion circuit and the grid voltage;

[0042] The expected value of the AC side voltage of the second power conversion circuit is determined based on the actual value of active power and the actual value of reactive power by the VSG control algorithm;

[0043] The three-phase modulation wave is generated by current loop calculation based on the expected value of the AC side voltage of the second power conversion circuit, the second sampling current and the grid voltage;

[0044] The second PWM signal is generated by pulse width modulation based on the three-phase modulation wave.

[0045] According to one embodiment of the present application, the expected value of the AC side voltage of the second power conversion circuit is determined based on the actual value of active power and the actual value of reactive power by the VSG control algorithm, comprising:

[0046] The amplitude and phase angle of the AC side voltage of the second power conversion circuit are determined.

[0047] According to one embodiment of the present application, in the case of the working mode of the power generation device being to supply power to the load, a third PWM signal is generated based on a proportional-integral control algorithm to drive the second power conversion circuit, comprising:

[0048] The AC voltage given value is determined based on the given grid current peak value and the grid side voltage phase;

[0049] The average bridge arm voltage is determined by proportional-resonant operation based on the AC voltage given value and the current value output by the second power conversion circuit;

[0050] The third PWM signal is generated by pulse width modulation based on the average bridge arm voltage.

[0051] According to one embodiment of the present application, the third PWM signal is generated by pulse width modulation based on the average bridge arm voltage, comprising:

[0052] The duty cycle of the third PWM signal is determined according to the bus voltage of the DC side of the first power conversion circuit and the average bridge arm voltage;

[0053] The third PWM signal is generated according to the duty cycle of the third PWM signal.

[0054] In a third aspect, the present application provides a computer program product, comprising:

[0055] The acquisition module is configured to acquire a first sampling current at an output side of the electrically excited synchronous motor and a bus voltage at a direct current side of the first power conversion circuit.

[0056] The signal generation module is configured to generate a first PWM signal based on the first sampling current and the bus voltage.

[0057] The driving module is configured to drive the first power conversion circuit by using the first PWM signal.

[0058] According to the computer program product, the electric energy output by the electrically excited synchronous motor is stored in the energy storage unit after being rectified by the first power conversion circuit, the energy storage unit can store excess energy or release the stored energy for power supply, so as to maintain a continuous and stable direct current voltage and improve the applicability of the electrically excited synchronous motor in an actual power supply scenario.

[0059] In a fourth aspect, the present application provides a computer readable storage medium, and the computer readable storage medium stores a computer program, wherein the computer program is executed by a processor to implement the steps of the power generation control method.

[0060] According to the computer readable storage medium, the electric energy output by the electrically excited synchronous motor is stored in the energy storage unit after being rectified by the first power conversion circuit, the energy storage unit can store excess energy or release the stored energy for power supply, so as to maintain a continuous and stable direct current voltage and improve the applicability of the electrically excited synchronous motor in an actual power supply scenario.

[0061] In a fifth aspect, the present application provides a power system, and the power system comprises a power grid, a load and the power generation device, and the output side of the power generation device is electrically connected with the power grid and the load respectively.

[0062] According to the power system, the electric energy output by the electrically excited synchronous motor is stored in the energy storage unit after being rectified by the first power conversion circuit, the energy storage unit can store excess energy or release the stored energy for power supply, so as to maintain a continuous and stable direct current voltage and improve the applicability of the electrically excited synchronous motor in an actual power supply scenario.

[0063] In a sixth aspect, the present application provides a vehicle, and the vehicle comprises the power generation device.

[0064] According to the vehicle, the electric energy output by the electrically excited synchronous motor is stored in the energy storage unit after being rectified by the first power conversion circuit, the energy storage unit can store excess energy or release the stored energy for power supply, so as to maintain a continuous and stable direct current voltage and improve the applicability of the electrically excited synchronous motor in an actual power supply scenario.

[0065] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and the attendant drawings or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0066] The foregoing and / or additional aspects and advantages of the application are achieved by providing a power generation device, a power generation control method, a computer program product and a control strategy, as specified by way of a non-restrictive example in the independent claims.

[0067] Figure 1 is a structural block diagram of a power generation device provided by an embodiment of the application;

[0068] Figure 2 is a structural block diagram of a power generation device provided by an embodiment of the application;

[0069] Figure 3 is a circuit topology diagram of a second power conversion circuit provided by an embodiment of the application;

[0070] Figure 4 is a structural block diagram of a power generation device provided by an embodiment of the application;

[0071] Figure 5 is a flowchart of a power generation control method provided by an embodiment of the application;

[0072] Figure 6 is one of schematic diagrams of a control strategy provided by an embodiment of the application;

[0073] Figure 7 is one of schematic diagrams of a control strategy provided by an embodiment of the application;

[0074] Figure 8 is one of schematic diagrams of a control strategy provided by an embodiment of the application;

[0075] Figure 9 is a structural block diagram of a computer program product provided by an embodiment of the application.

[0076] REFERENCE NUMERALS

[0077] Electrically excited synchronous motor 10, brushless excitation system 11, first power conversion circuit 20, energy storage unit 30, second power conversion circuit 40, inverter circuit 41, filter circuit 42, direct current conversion circuit 50, impeller 60, load 70, power grid 80, computer program product 90, acquisition module 91, signal generation module 92, drive module 93, filter inductance Ls, filter capacitance C. DETAILED DESCRIPTION

[0078] Embodiments of the present application are described below in detail with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are for the purpose of explanation only, and are not to be understood as limiting the present application.

[0079] In the following description, "circuitry" refers to an electrical line loop formed by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is said to be "coupled to" or "connected to" another element or said element / circuit is "coupled between" or "connected between" two nodes, it can be directly coupled or connected to another element or there can be an intermediate element, and the connection between the elements can be physical, logical, or a combination thereof. On the contrary, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there is no intermediate element between the two.

[0080] In the description, the terms "first", "second", and the like are used to distinguish similar objects, and are not used to describe a particular order or sequence. It should be understood that the numerical descriptors used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are usually a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the objects before and after are in a "or" relationship.

[0081] In addition, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0082] As a core component of power generation equipment, electrically excited synchronous machines exhibit diverse functions and adaptability under different operating conditions, and are widely used in various energy conversion scenarios, including hydroelectric, thermal, wind and nuclear power. Through the regulation of the excitation system, electrically excited synchronous machines can adapt to various operating requirements and perform outstandingly in terms of energy conversion efficiency and dynamic response capability.

[0083] However, due to the dynamic fluctuation of the rotor speed during the operation of the motor, the output voltage of the electrically excited synchronous motor fluctuates, which makes it difficult for the load or power grid in the subsequent stage to obtain continuous and stable power supply, and to some extent limits its applicability in actual power supply scenarios.

[0084] Figure 1 The structure block diagram of the power generation device provided by the embodiment of the application is shown. Referring to Figure 1 The embodiment of the application provides a power generation device, which comprises an electrically excited synchronous motor 10, a first power conversion circuit 20 and an energy storage unit 30. The AC side of the first power conversion circuit 20 is electrically connected to the output side of the electrically excited synchronous motor 10; the energy storage unit 30 is electrically connected to the DC side of the first power conversion circuit 20, and the output end of the energy storage unit 30 is used for power supply.

[0085] The electrically excited synchronous motor 10 is a common type of motor, which has a fixed speed and is synchronized with the frequency of the power grid 80. In the process of power generation, the rotor of the electrically excited synchronous motor 10 usually needs to be provided with an excitation current by an external power source, so as to generate a magnetic field to realize power generation.

[0086] The electrically excited synchronous motor 10 has different functional characteristics in the motor mode and the power generation mode. In the power generation mode, AC power is generated by the rotation of the rotor to supply power to the load 70 or the power grid 80.

[0087] The first power conversion circuit 20 refers to a circuit for converting electric energy. Specifically, the first power conversion circuit 20 converts the AC power generated by the electrically excited synchronous motor 10 into DC power to supply the subsequent circuit.

[0088] The first power conversion circuit 20 is mainly used to realize the rectification function, and its specific structure can be selected according to the actual application scenario, which is not limited here.

[0089] The energy storage unit 30 is a device for storing electric energy. The energy storage unit 30 can store power when the power production is excessive and release power when the power demand is high. The energy storage unit 30 is electrically connected to the DC side of the first power conversion circuit 20, and can accept the DC power from the first power conversion circuit 20 and store it. When needed, the stored electric energy can be released.

[0090] The specific type of the energy storage unit 30 can be selected according to the actual application scenario, which is not limited here. For example, the energy storage unit 30 can be an energy storage battery.

[0091] When the output voltage of the electrically excited synchronous motor 10 is high, the energy storage unit 30 can store the excess energy. When the output voltage of the electrically excited synchronous motor 10 is low, it is difficult to meet the demand of the load, and the energy storage unit 30 can release the stored energy to supply power, so as to maintain the continuous and stable DC supply voltage.

[0092] According to the power generation device provided in the application, the electric energy output by the electrically excited synchronous motor 10 is rectified by the first power conversion circuit 20 and stored in the energy storage unit 30. The energy storage unit 30 can store excess energy or release the stored energy to supply power, so as to maintain the continuous and stable DC voltage, and improve the applicability of the electrically excited synchronous motor in the actual power supply scene.

[0093] Figure 2 The structural block diagram of the power generation device provided in the embodiments of the application is shown. Referring to Figure 2 In some embodiments, the output end of the energy storage unit 30 includes a first DC output end, and the power generation device further includes a second power conversion circuit 40. The DC side of the second power conversion circuit 40 is electrically connected with the first DC output end of the energy storage unit 30, and the AC side of the second power conversion circuit 40 is adapted to be electrically connected with the load 70 and / or the power grid 80.

[0094] The second power conversion circuit 40 refers to a circuit for converting electric energy. The DC side of the second power conversion circuit 40 is electrically connected with the DC side of the energy storage unit 30 and the first power conversion circuit 20 respectively, and the second power conversion circuit 40 can convert the DC power output by the first power conversion circuit 20 or the DC power stored in the energy storage unit 30 into AC power to supply the power grid 80 or the load 70.

[0095] In some embodiments, the DC side of the second power conversion circuit 40 is electrically connected with the DC side of the first power conversion circuit 20.

[0096] The DC power output by the DC side of the first power conversion circuit 20 can also provide electric energy for the second power conversion circuit 40. Both the first power conversion circuit 20 and the energy storage unit 30 can provide electric energy for the second power conversion circuit 40, so as to ensure that the DC voltage provided after conversion by the second power conversion circuit 40 meets the demand of the load 70 and / or the power grid 80.

[0097] In other embodiments, the first power conversion circuit 20 and the second power conversion circuit 40 are bidirectional power conversion circuits, that is, the second power conversion circuit 40 can transmit the AC power of the power grid 80 to the DC side of the first power conversion circuit 20 and the energy storage unit 30 after rectification, and the first power conversion circuit 20 transmits the DC power of the DC side and the energy storage unit 30 to the electrically excited synchronous motor 10 after inversion, so that the electrically excited synchronous motor 10 works in the motor mode.

[0098] Figure 3 A structural block diagram of the second power conversion circuit 40 provided by the embodiments of the present application is shown. Referring to Figure 3 In some embodiments, the second power conversion circuit 40 includes an inverter circuit 41 and a filter circuit 42. The direct current side of the inverter circuit 41 is electrically connected to the first direct current output end of the energy storage unit 30; the input side of the filter circuit 42 is electrically connected to the alternating current side of the inverter circuit 41, and the input side of the filter circuit 42 is adapted to be electrically connected to the load 70 and / or the power grid 80.

[0099] The direct current side of the inverter circuit 41 is electrically connected to the first direct current output end of the energy storage unit 30, and the alternating current side of the inverter circuit 41 is connected to the load 70 and / or the power grid 80 through the filter circuit 42. The inverter circuit 41 can convert the direct current provided by the energy storage unit 30 into alternating current suitable for use by the power grid 80 or the load 70, and can adjust the output voltage and frequency according to the requirements of the load 70 to ensure the stability and compatibility of power supply.

[0100] The filter circuit 42 is mainly used to eliminate high-frequency noise and harmonics generated in the conversion process of the inverter circuit 41, to ensure that the output power quality meets the standard requirements. The filter circuit 42 can smooth the output current, avoid current instability caused by fluctuations and noise, and thus improve the reliability of the power supply system. Through the filtering effect, the filter circuit 42 can further optimize the power output, ensure that the power grid 80 and the load 70 can receive high-quality current, and reduce the risk of damage and abnormal operation of electrical equipment.

[0101] In some embodiments, the inverter circuit 41 includes a three-phase full-bridge circuit, the direct current side of the three-phase full-bridge circuit is electrically connected to the first direct current output end of the energy storage unit 30, and the alternating current side of the three-phase full-bridge circuit is electrically connected to the input side of the filter circuit 42.

[0102] The three-phase full-bridge circuit is mainly used to convert direct current into three-phase alternating current. In each phase, the three-phase full-bridge circuit alternately converts direct current voltage into alternating current voltage by controlling the conduction and non-conduction states of the switches, thereby generating a three-phase alternating current output.

[0103] The three-phase full-bridge circuit can provide a relatively balanced and low-harmonic three-phase alternating current output, and can operate in a wide frequency range, which can reduce losses and improve the overall performance of the system.

[0104] In some embodiments, the filter circuit 42 includes a filter inductor Ls and a filter capacitor C. The first end of the filter inductor Ls is electrically connected to the alternating current side of the inverter circuit; the first end of the filter capacitor C is electrically connected to the second end of the filter inductor Ls, and the second end of the filter capacitor C is electrically connected to a ground node.

[0105] The filter inductance Ls mainly suppresses high-frequency noise and fluctuations by inductance characteristics, and smoothes the current waveform. When the alternating current signal output by the inverter circuit 41 is transmitted to the filter inductance, the inductance filters the signal by its own inductive characteristics, reducing the high-frequency components and pulsations in the signal.

[0106] The filter capacitor C is used to further smooth the voltage waveform and reduce voltage fluctuations and ripples of the power supply. The first end of the filter capacitor is electrically connected to the second end of the filter inductance, forming a filter network that eliminates residual high-frequency noise in the filter inductance Ls by storing and releasing energy.

[0107] The filter circuit 42 effectively removes high-frequency noise from the alternating current signal through the synergistic effect of inductance and capacitance, ensuring the smoothness and stability of the output signal.

[0108] In some embodiments, the output end of the energy storage unit 30 includes a second DC output end, which is electrically connected to the brushless excitation system 11 of the electrically excited synchronous motor 10.

[0109] In the power generation device, the rotor winding of the electrically excited synchronous motor 10 requires continuous excitation current to maintain the stability of its magnetic field. The energy storage unit 30 can provide the required excitation current according to the operating requirements of the electrically excited synchronous motor 10.

[0110] The electric energy output by the electrically excited synchronous motor 10 is rectified by the first power conversion circuit 20 and stored in the energy storage unit 30, which can provide the required excitation current for the brushless excitation system 11 of the electrically excited synchronous motor 10 without the need for additional current-providing devices, saving costs.

[0111] Figure 4 The circuit topology of the power generation device provided by the embodiments of the present application is shown. Referring to Figure 4 In some embodiments, the power generation device further includes a DC conversion circuit 50, the input side of the DC conversion circuit 50 is electrically connected to the second DC output end of the energy storage unit 30, and the output side of the DC conversion circuit 50 is electrically connected to the brushless excitation system 11 of the electrically excited synchronous motor 10.

[0112] The DC conversion circuit 50 is mainly used to reduce the voltage of the energy storage unit 30 and transmit it to the brushless excitation system 11, so as to convert the electric energy stored in the energy storage unit 30 into direct current suitable for the brushless excitation system 11 of the electrically excited synchronous motor 10, without the need for additional current-providing devices, saving costs.

[0113] The specific structure of the DC conversion circuit 50 can be selected according to the actual application scenario, which is not limited here. For example, the DC conversion circuit 50 can be a chopper circuit.

[0114] By introducing the DC conversion circuit 50 and the energy storage unit 30, a feedback loop can be formed, which not only provides the required excitation current for the electrically excited synchronous motor 10, but also ensures that the system can work efficiently and stably under different loads or operating conditions.

[0115] In some embodiments, the first power conversion circuit 20 includes a full-bridge rectifier circuit.

[0116] The full-bridge rectifier circuit is mainly used to convert the alternating current output by the electrically excited synchronous motor 10 into direct current for subsequent circuit use.

[0117] The full-bridge rectifier circuit output has small DC voltage fluctuation and better smoothing effect, which can provide a smooth and stable DC voltage source for the energy storage unit 30, improve the conversion efficiency and prolong the service life of the system.

[0118] Continuing to refer to Figure 3 In some embodiments, the input side of the electrically excited synchronous motor 10 is connected to the impeller 60 or the flywheel.

[0119] In traditional power generation systems, power transmission usually goes through multiple intermediate links such as gear transmission and mechanical transmission, which often causes certain losses in the energy transmission process.

[0120] The impeller 60 is connected to the input side of the electrically excited synchronous motor 10, which is mainly used to capture wind energy and convert it into mechanical energy to drive the rotation of the rotor of the electrically excited synchronous motor 10, thereby generating electric energy.

[0121] When power is needed, the rotational energy of the flywheel drives the rotor of the electrically excited synchronous motor 10 to rotate through the transmission system. The electrically excited synchronous motor 10 uses the mechanical energy of the flywheel rotation to drive the motor rotor to rotate, thereby generating electric energy. In this process, the flywheel maintains the operation of the motor by releasing the stored mechanical energy, generating stable power output.

[0122] The electrically excited synchronous motor 10 has a high power factor and low loss, and after being directly connected to the impeller 60 or the flywheel, it can more efficiently convert mechanical energy into electric energy. Due to the high efficiency of the electrically excited synchronous motor 10 itself and the direct coupling with the impeller 60 or the flywheel, the system can achieve higher energy conversion efficiency. Especially in the case of small and medium power, the efficiency advantage of the electrically excited synchronous motor 10 is particularly obvious.

[0123] In some embodiments, the impeller 60 or the flywheel is connected to the rotor of the electrically excited synchronous motor to drive the rotation of the rotor of the electrically excited synchronous motor 10.

[0124] The impeller 60 or flywheel functions to provide the necessary power input through mechanical connection with the rotor of the electrically excited synchronous motor, to drive the rotor to rotate, thereby realizing mechanical conversion of electrical energy.

[0125] By connecting the impeller 60 or flywheel with the rotor of the electrically excited synchronous motor 10, the power output of the motor and the stability of the system can be effectively improved. For the electrically excited synchronous motor 10, this design not only enhances the energy conversion efficiency of the system, but also enables more stable operation under different loads and working conditions, reducing the vibration and noise of the system.

[0126] Figure 5 A flowchart of the power generation control method provided by an embodiment of the application is shown. Referring to Figure 5 An embodiment of the application provides a power generation control method applied to the power generation device described above, which includes steps 10, 20 and 30.

[0127] Step 10: obtaining a first sampling current at the output side of the electrically excited synchronous motor 10 and a bus voltage at the DC side of the first power conversion circuit 20;

[0128] Step 20: generating a first PWM signal based on the first sampling current and the bus voltage;

[0129] Step 30: driving the first power conversion circuit 20 with the first PWM signal.

[0130] The power generation device usually further includes a controller connected to the driving end of the switching tube in each power conversion circuit, for applying a driving signal to each switching tube to realize energy transmission by switching the switching tube between the on state and the off state.

[0131] The execution subject of the power generation control method provided by an embodiment of the application can be the controller described above or a functional module or functional entity in the controller capable of realizing the control method. The power generation control method provided by an embodiment of the application is described below with the controller as the execution subject.

[0132] Figure 6 A control strategy provided by an embodiment of the application is shown. Referring to Figure 6 In some embodiments, the control method further includes: obtaining a first sampling current at the output side of the electrically excited synchronous motor 10 and a bus voltage at the DC side of the first power conversion circuit 20; generating a first PWM signal based on the first sampling current and the bus voltage; and driving the first power conversion circuit 20 with the first PWM signal.

[0133] The controller can obtain the first sampling current at the output side of the electrically excited synchronous motor 10 and the bus voltage at the DC side of the first power conversion circuit 20 through sensors or sampling devices. The first sampling current represents the actual three-phase current value output by the motor, while the bus voltage is the DC voltage of the first power conversion circuit 20.

[0134] Based on the first sampling current and the bus voltage, the controller can use a proportional-integral algorithm for signal processing and calculation to generate the first PWM signal. The generated first PWM signal is used to drive the switching elements in the first power conversion circuit 20 to turn on and off, thereby adjusting the output of current and voltage. This ensures the coordinated operation of the electrically excited synchronous motor 10 and the power conversion circuit, thereby achieving efficient power conversion and stable power supply. This method improves the dynamic response speed and stability of the system through precise current and voltage regulation and PWM control, effectively avoiding fluctuations and instability in the electrical system.

[0135] According to the power generation control method of the present application, the electric energy output by the electrically excited synchronous motor 10 is rectified by the first power conversion circuit 20 and stored in the energy storage unit 30. The energy storage unit 30 can store excess energy or release stored energy for power supply, to maintain a continuous and stable DC voltage, improving the applicability of the electrically excited synchronous motor in actual power supply scenarios.

[0136] In some embodiments, generating the first PWM signal based on the first sampling current and the bus voltage includes: sequentially performing Clark coordinate transformation and Park coordinate transformation on the first sampling current to determine the actual currents id and iq of the first sampling current in the dq axis; performing proportional-integral operation based on the difference between the given current id* of the d-axis and the actual current id of the d-axis to determine the expected bus voltage Ua of the a-axis; performing proportional-integral operation based on the difference between the given current iq* of the q-axis and the actual current iq of the q-axis to determine the expected bus voltage Ub of the b-axis; and performing pulse width modulation based on the voltage Ua and the voltage Ub to generate the first PWM signal.

[0137] In the natural coordinate system, the voltage equation of the brushless electrically excited synchronous motor 10 is as follows:

[0138]

[0139] where ua, ub, uc, and uf represent the stator three-phase winding voltage and rotor winding voltage of the electrically excited synchronous motor 10, respectively; Ra, Rb, Rc, and Rf represent the motor stator three-phase winding and rotor excitation winding resistance, respectively; ia, ib, ic, and if represent the current of the motor stator three-phase winding and rotor excitation winding, respectively; d / dt represents the differential operator; and ψa, ψb, ψc, and ψf represent the motor three-phase winding and rotor excitation winding flux linkage, respectively.

[0140] The mathematical model of the electrically excited synchronous motor 10 in the natural coordinate system is a linear time-varying equation, which is complex to calculate. Through Clark coordinate transformation and Park coordinate transformation, the mathematical model of the motor in the natural coordinate system can be converted into the mathematical model in the rotating coordinate system for control, simplifying the control method of the motor.

[0141] In the rotating coordinate system, the electrically excited synchronous motor 10 is established with the motor mathematical model with the rotor winding magnetic pole axis as the d-axis and the direction 90° ahead of the electric angle as the q-axis. The d-q axis stator voltage equation is as follows:

[0142]

[0143] Among them, ud, uq are the dq axis voltages of the stator winding, Rs is the resistance of the stator winding, id, iq are the dq axis currents of the stator, ωr is the motor speed, ψd, ψq are the dq axis fluxes on the stator side, Ld, Lq are the equivalent inductances of the stator winding dq axis, Lm is the mutual inductance between the rotor field winding and the equivalent winding of the stator d-axis, if is the current of the rotor field winding.

[0144] The voltage equation of the rotor side field winding of the electrically excited synchronous motor 10 is as follows:

[0145]

[0146] Among them, Lf is the equivalent inductance of the rotor field winding.

[0147] The controller performs Clark coordinate transformation (also known as αβ transformation) on the first sampled current, converting the three-phase alternating current signal into a two-phase stationary coordinate system (α-axis and β-axis). The purpose of this process is to simplify subsequent control and regulation, as the two-phase coordinate system is more suitable for power control and regulation. Next, Park coordinate transformation (dq transformation) is performed, converting the αβ coordinates in the stationary coordinate system into the d-axis (direct axis) and q-axis (quadrature axis) in the rotating coordinate system, thereby decomposing the alternating current into direct current component (d-axis current id) and alternating component (q-axis current iq).

[0148] Based on the difference between the given d-axis current id* and the actual d-axis current id, proportional-integral (PI) control operation is performed to calculate the control error of the d-axis. Through this error, the desired bus voltage Uα can be generated, which is used to regulate the current state of the motor to make the actual current id close to the given target current id*. The PI controller helps to reduce errors and maintain system stability by adjusting the feedback of the system.

[0149] Similarly, based on the difference between the q-axis given current iq* and the actual current iq, a proportional-integral (PI) control operation is performed to calculate the control error of the q-axis current. Through this error, the desired bus voltage Uβ is generated, which is used to adjust the reactive current part of the motor to ensure that the system remains in the ideal current state and reduces the fluctuation of reactive power.

[0150] Finally, based on the calculated desired bus voltages Uα and Uβ, pulse width modulation is performed. The pulse width modulation process generates control signals according to the amplitude and phase of the voltage signals Uα and Uβ, thereby controlling the switching state of the power conversion circuit. The first PWM signal finally drives the first power conversion circuit 20 to ensure that the current and voltage of the motor operate within the control target range, thereby achieving efficient power conversion and current regulation.

[0151] In some embodiments, before determining the desired bus voltage Uα of the α-axis based on the proportional-integral operation of the difference between the d-axis given current id* and the d-axis actual current id, the method further comprises: determining the d-axis given current id* based on the proportional-integral operation of the bus voltage and the given value of the bus voltage.

[0152] The proportional-integral (PI) operation based on the bus voltage and the given value of the bus voltage is mainly used to adjust the bus voltage to approach the ideal voltage value set by the system. Through the PI control algorithm, the controller can generate an adjustment signal to guide the bus voltage to approach the target value according to the error between the bus voltage and the given value.

[0153] Based on the proportional-integral operation result of the bus voltage and its given value, the system adjusts the operating state through the adjustment of the current. The PI control algorithm reflects the actual change of the bus voltage to the adjustment of the d-axis given current id*. Through the proportional-integral operation, the system can generate a suitable d-axis given current id* to ensure that the system maintains the desired electrical state during operation.

[0154] The difference between the d-axis given current and the d-axis actual current id reflects the deviation between the actual current and the target current. According to this deviation, the system further adjusts through the proportional-integral control algorithm. The PI controller performs operation according to the current error to generate a control signal to adjust the desired bus voltage Uα of the α-axis.

[0155] In some embodiments, the power generation device further comprises a second power conversion circuit 40, the direct current side of the second power conversion circuit 40 is electrically connected to the first direct current output end of the energy storage unit 30, and the alternating current side of the second power conversion circuit 40 is adapted to be electrically connected to the load 70 and / or the power grid 80; the method further comprises:

[0156] In the case that the working mode of the power generation device is to supply power to the power grid, the second PWM signal is generated based on the VSG control algorithm to drive the second power conversion circuit;

[0157] In the case that the working mode of the power generation device is to supply power to the load, the third PWM signal is generated based on the proportional integral control algorithm to drive the second power conversion circuit.

[0158] The working mode of the power generation device is mainly determined according to the object connected to the AC side of the second power conversion circuit 40. In the case that the AC side of the second power conversion circuit 40 is connected to the power grid 80, the working mode of the power generation device is to supply power to the power grid 80, i.e., working in the three-phase output mode; in the case that the AC side of the second power conversion circuit 40 is connected to the load 70, the working mode of the power generation device is to supply power to the load 70, i.e., working in the single-phase output mode.

[0159] The power generation control method can ensure stable operation and efficient output of the power generation device under varying working conditions by adopting different control strategies in different working modes (i.e., supplying power to the power grid 80 or supplying power to the load 70).

[0160] Specifically, in the case of supplying power to the power grid 80, the three-phase output of the AC side of the second power conversion circuit 40 is connected to the power grid 80, and the target of the power generation device is to stably deliver power to the power grid 80 to ensure the stability of the voltage and frequency of the power grid 80. In this case, the VSG control algorithm (Virtual Synchronous Generator) is used, which can simulate the characteristics of a traditional synchronous generator and provide similar frequency and voltage stability of the power grid 80. The second PWM signal generated by the VSG control algorithm can adjust the state of the switching tube in the second power conversion circuit 40 to adapt to the load changes of the power grid 80 and ensure the smooth supply of power to the power grid 80.

[0161] When supplying power to the load 70, any two phases of the three-phase output of the AC side of the second power conversion circuit 40 are connected to the load 70, and the other phase is left floating, and the output power needs to be adjusted according to the real-time changes of the load 70. The load 70 can fluctuate, so a more flexible control strategy is needed to cope with it. In this case, the proportional integral control algorithm is used, which can adjust the output voltage and current of the power generation device in real time to ensure the stability of the load 70 current. Through the generated third PWM signal, the state of the switching tube in the second power conversion circuit 40 can be adjusted according to the demand of the load 70, so as to meet the fluctuation demand of the load 70.

[0162] Since the power generation control method can use the most suitable control algorithm according to different working modes, the system can operate efficiently and stably in different working states, and the applicability of the power generation device in actual power supply scenarios is improved.

[0163] Figure 7 The control strategy provided by the embodiments of the application is shown. Referring to Figure 7 In some embodiments, when the working mode of the power generation device is to supply power to the power grid 80, the second PWM signal is generated based on the VSG control algorithm to drive the second power conversion circuit 40, including: determining the actual value Pe of active power and the actual value Qe of reactive power output by the second power conversion circuit 40 according to the second sampling current on the AC side of the second power conversion circuit 40 and the voltage of the power grid 80; determining the expected value of the AC side voltage of the second power conversion circuit 40 based on the VSG control algorithm based on the actual value Pe of active power and the actual value Qe of reactive power; generating a three-phase modulation wave based on the current loop calculation based on the expected value of the AC side voltage of the second power conversion circuit 40, the second sampling current and the voltage of the power grid 80; generating the second PWM signal based on the pulse width modulation based on the three-phase modulation wave.

[0164] The second sampling current refers to the three-phase current on the AC side of the second power conversion circuit 40, and the voltage of the power grid 80 refers to the actual value of the three-phase voltage of the power grid 80. According to the collected current and voltage data, the actual value of the active power and the actual value of the reactive power output by the second power conversion circuit 40 can be determined, that is, the load 70 response of the power generation device to the power grid 80 is obtained.

[0165] Based on the actual value of the active power and the actual value of the reactive power, the expected value of the AC side voltage of the second power conversion circuit 40 can be determined through the VSG control algorithm. The VSG control algorithm simulates the characteristics of the synchronous generator, so that the voltage in the power grid 80 is stable, and the power regulation function similar to the traditional generator is provided.

[0166] Based on the calculated expected AC side voltage, the second sampling current and the voltage information of the power grid 80, the current loop calculation is performed. The purpose of this process is to ensure the balance and synchronization of the current of the power grid 80 by optimizing the current waveform to prevent current fluctuations.

[0167] Based on the calculation result of the current loop, a three-phase modulation wave is generated. This modulation wave will be used to accurately control the output of the second power conversion circuit 40 to match the demand of the power grid 80.

[0168] Based on the generated three-phase modulation wave, the pulse width modulation is performed to drive the second power conversion circuit 40. This process can generate a second PWM signal, which controls the switching frequency of the power converter, thereby adjusting the output of the power conversion circuit to ensure stable power supply to the power grid 80.

[0169] Through the above steps, the system can accurately control the output of the power generation device, ensure effective connection with the power grid 80, and provide stable power supply.

[0170] In some embodiments, the VSG control algorithm determines the expected value of the voltage on the AC side of the second power conversion circuit 40 based on the actual values of active power Pe and reactive power Qe, including determining the amplitude and phase angle of the voltage on the AC side of the second power conversion circuit 40.

[0171] Generally, active power and reactive power are determined by the load conditions and operating state of the power grid 80. These two values are key parameters for power system stability and control.

[0172] According to the actual values of active power and reactive power, the VSG control algorithm adjusts the voltage and frequency by simulating the dynamic characteristics of synchronous generators. The core goal of the VSG control algorithm is to mimic the behavior of traditional synchronous generators, ensuring that the voltage and frequency remain stable in the power system. In this algorithm, the actual values of active power Pe and reactive power Qe are used to calculate the amplitude and phase angle of the voltage.

[0173] In the VSG control algorithm, the amplitude of the expected voltage on the AC side of the second power conversion circuit 40 needs to be calculated based on the actual values of active power Pe and reactive power Qe, using the control strategy of the system and the requirements of the power grid 80. The phase angle determines the timing characteristics of the voltage of the power grid 80, which is closely related to the frequency and stability of the system. Based on the actual values of active power Pe and reactive power Qe, the VSG control algorithm calculates the phase angle of the expected voltage on the AC side by analyzing the power flow and voltage phase difference, to ensure the synchronization and stability of the power system.

[0174] The expected value of the voltage on the AC side of the second power conversion circuit 40 (including amplitude and phase angle) will be input as a control command into the power conversion device to adjust the voltage output in real time. This adjustment process dynamically responds to changes in the load and operating state of the power grid 80 through the feedback mechanism of the VSG control algorithm, thereby achieving stable control of the voltage of the power grid 80 and ensuring that the power system can still operate normally under frequency and voltage fluctuations.

[0175] Figure 8 The control strategy provided by the embodiments of the present application is shown. Referring to Figure 8In some embodiments, when the power generation device is operating in the mode of supplying power to the load 70, a third PWM signal is generated based on a proportional-integral control algorithm to drive the second power conversion circuit 40. This includes: determining an AC voltage setpoint based on the given peak current of the grid 80 and the phase of the grid-side voltage; performing a proportional-resonant operation based on the AC voltage setpoint and the current value output by the second power conversion circuit 40 to determine the average bridge arm voltage; and performing pulse width modulation based on the average bridge arm voltage to generate the third PWM signal.

[0176] When the power generation device is operating in the mode of supplying power to the load 70, any two phases of the three-phase output of the AC side of the second power conversion circuit 40 are connected to the load 70, while the other phase is left unconnected.

[0177] During the control process, the setpoint value of the AC voltage needs to be determined based on the peak current of the given grid 80 and the phase of the grid-side voltage. The peak current of grid 80 is usually determined by the load conditions of grid 80, while the phase of the grid-side voltage reflects the frequency characteristics of grid 80. Specifically, the setpoint value of the AC voltage can be obtained by multiplying the given peak current C of grid 80 by the inverted phase of the grid-side voltage, -K.

[0178] Based on the AC voltage setpoint and the current value of the two-phase output connected to the load 70 in the second power conversion circuit 40 (e.g. Figure 6 As shown in ia and ib), proportional-resonant (PR) operation is performed. Specifically, the current error is obtained by subtracting the current value of the two-phase output connected to the load 70 in the second power conversion circuit 40 from the given AC voltage value. After calculating the current error through proportional-resonant control, the voltage difference of each phase inductor is obtained. Subtracting the voltage difference of each phase inductor from the voltage on the load 70 side yields the averaged bridge arm voltage. Based on the averaged bridge arm voltage, pulse width modulation is performed to generate the third PWM signal. The third PWM signal is used to drive the first and second bridge arms in the three-phase inverter circuit 41 to turn on and off. The third bridge arm switch in the three-phase inverter circuit 41 can be turned on in a complementary manner at the power frequency by judging the polarity of the third PWM signal.

[0179] In some embodiments, pulse width modulation is performed based on the average bridge arm voltage to generate a third PWM signal, including: determining the duty cycle of the third PWM signal based on the bus voltage on the DC side of the first power conversion circuit 20 and the average bridge arm voltage; and generating the third PWM signal based on the duty cycle of the third PWM signal.

[0180] The bus voltage at the direct current side of the first power conversion circuit 20 is taken as the denominator, the average bridge arm voltage is taken as the numerator, and the duty ratio of the third PWM signal is the ratio of the average bridge arm voltage to the bus voltage at the direct current side of the first power conversion circuit 20. Then, the third PWM signal is generated according to the duty ratio, accurate control of the switch tube in the inverter circuit 41 is realized, and the output voltage meets the demand of the load 70.

[0181] Figure 9 The structural block diagram of the computer program product 90 provided by the embodiment of the application is shown. Referring to Figure 9 The embodiment of the application provides a computer program product 90, which comprises an acquisition module 91, a signal generation module 92 and a driving module 93. The acquisition module is used for acquiring a first sampling current at an output side of an electrically excited synchronous motor and a bus voltage at a direct current side of a first power conversion circuit; the signal generation module is used for generating a first PWM signal based on the first sampling current and the bus voltage; and the driving module is used for driving the first power conversion circuit by using the first PWM signal.

[0182] The description of the features in the embodiment corresponding to the computer program product 90 can be referred to the related description of the embodiment corresponding to the power generation device and the power generation control method, which will not be repeated here.

[0183] According to the computer program product 90 of the application, the electric energy output by the electrically excited synchronous motor 10 is stored to the energy storage unit 30 after being rectified by the first power conversion circuit 20, the energy storage unit 30 can store excess energy or release the stored energy for power supply, so as to maintain a continuous and stable direct current voltage and improve the applicability of the electrically excited synchronous motor in an actual power supply scene.

[0184] The embodiment of the application provides a computer readable storage medium, and the computer readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the power generation control method are realized.

[0185] The description of the features in the embodiment corresponding to the computer readable storage medium can be referred to the related description of the embodiment corresponding to the power generation control method, which will not be repeated here.

[0186] According to the computer readable storage medium of the application, the electric energy output by the electrically excited synchronous motor 10 is stored to the energy storage unit 30 after being rectified by the first power conversion circuit 20, the energy storage unit 30 can store excess energy or release the stored energy for power supply, so as to maintain a continuous and stable direct current voltage and improve the applicability of the electrically excited synchronous motor in an actual power supply scene.

[0187] The embodiment of the application provides a power system, which comprises a power grid 80, a load 70 and the power generation device. The output side of the power generation device is electrically connected with the power grid 80 and the load 70.

[0188] The structure and working principle of the power generation device can refer to the foregoing embodiments, which will not be described here again.

[0189] The power system usually further comprises a controller, an output end of the controller being connected with driving ends of the switching tubes in the power conversion circuit of the power generation device, and each switching tube being switched between the on state and the off state by the controller to realize the transmission and conversion of electric energy through the foregoing control method.

[0190] The specific steps of the control method can refer to the foregoing embodiments, which will not be described here again.

[0191] According to the power system of the application, the electric energy output by the electrically excited synchronous motor 10 is rectified by the first power conversion circuit 20 and stored in the energy storage unit 30, the energy storage unit 30 can store excess energy or release the stored energy for power supply, so as to maintain a continuous and stable direct current voltage, and improve the applicability of the electrically excited synchronous motor in actual power supply scenarios.

[0192] One embodiment of the application provides a vehicle, which comprises the foregoing power generation device.

[0193] The structure and working principle of the power generation device can refer to the foregoing embodiments, which will not be described here again.

[0194] According to the vehicle of the application, the electric energy output by the electrically excited synchronous motor 10 is rectified by the first power conversion circuit 20 and stored in the energy storage unit 30, the energy storage unit 30 can store excess energy or release the stored energy for power supply, so as to maintain a continuous and stable direct current voltage, and improve the applicability of the electrically excited synchronous motor in actual power supply scenarios.

[0195] Although the embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the application, and the scope of the application is defined by the claims and their equivalents.

Claims

1. A power generation device, characterized in that, include: Electrically excited synchronous motor; A first power conversion circuit, wherein the AC side of the first power conversion circuit is electrically connected to the output side of the electrically excited synchronous motor; An energy storage unit is provided, the input of which is electrically connected to the DC side of the first power conversion circuit, and the output of which is used to supply power.

2. The power generation device according to claim 1, characterized in that, The energy storage unit includes a first DC output terminal, and the power generation device further includes: A second power conversion circuit, wherein the DC side of the second power conversion circuit is electrically connected to the first DC output terminal of the energy storage unit, and the AC side of the second power conversion circuit is adapted to be electrically connected to the load and / or the power grid.

3. The power generation device according to claim 2, characterized in that, The DC side of the second power conversion circuit is electrically connected to the DC side of the first power conversion circuit.

4. The power generation device according to claim 2, characterized in that, The second power conversion circuit includes: An inverter circuit, wherein the DC side of the inverter circuit is electrically connected to the first DC output terminal of the energy storage unit; A filter circuit, wherein the input side of the filter circuit is electrically connected to the AC side of the inverter circuit, and the input side of the filter circuit is adapted to be electrically connected to the load and / or the power grid.

5. The power generation device according to claim 4, characterized in that, The inverter circuit includes a three-phase full-bridge circuit. The DC side of the three-phase full-bridge circuit is electrically connected to the first DC output terminal of the energy storage unit, and the AC side of the three-phase full-bridge circuit is electrically connected to the input side of the filter circuit.

6. The power generation device according to claim 4, characterized in that, The filtering circuit includes: A filter inductor, the first end of which is electrically connected to the AC side of the inverter circuit; A filter capacitor, wherein the first end of the filter capacitor is electrically connected to the second end of the filter inductor, and the second end of the filter capacitor is electrically connected to a grounding node.

7. The power generation device according to claim 1, characterized in that, The energy storage unit has a second DC output terminal, which is electrically connected to the brushless excitation system of the electrically excited synchronous motor.

8. The power generation device according to claim 7, characterized in that, The power generation device also includes: A DC-DC converter circuit is provided, wherein the input side of the DC-DC converter circuit is electrically connected to the second DC output terminal of the energy storage unit, and the output side of the DC-DC converter circuit is electrically connected to the brushless excitation system of the electrically excited synchronous motor.

9. The power generation device according to claim 1, characterized in that, The first power conversion circuit includes a full-bridge rectifier circuit.

10. The power generation device according to any one of claims 1-9, characterized in that, The input side of the electrically excited synchronous motor is connected to the impeller or flywheel.

11. The power generation device according to claim 10, characterized in that, The impeller or the flywheel is connected to the rotor of the electrically excited synchronous motor to drive the rotor of the electrically excited synchronous motor to rotate.

12. A power generation control method, characterized in that, Applied to a power generation device according to any one of claims 1-11, the method comprises: Obtain the first sampling current on the output side of the electrically excited synchronous motor and the bus voltage on the DC side of the first power conversion circuit; A first PWM signal is generated based on the first sampled current and the bus voltage; The first power conversion circuit is driven by the first PWM signal.

13. The power generation control method according to claim 12, characterized in that, The step of generating a first PWM signal based on the first sampled current and the bus voltage includes: The first sampled current is subjected to Clark coordinate transformation and Park coordinate transformation in sequence to determine the actual current id and iq of the first sampled current on the dq axis; The desired bus voltage Uα on the α axis is determined by proportional-integral calculation based on the difference between the given current id* on the d axis and the actual current id on the d axis. The desired bus voltage Uβ of the β axis is determined by proportional-integral calculation based on the difference between the given current iq* on the q axis and the actual current iq on the q axis. The first PWM signal is generated by pulse width modulation based on voltages Uα and Uβ.

14. The power generation control method according to claim 13, characterized in that, Before determining the desired bus voltage Uα on the α axis by performing proportional-integral calculation based on the difference between the given d-axis current id* and the actual d-axis current id, the following steps are also included: The given d-axis current id* is determined by performing proportional-integral calculations based on the given bus voltage and the given bus voltage values.

15. The power generation control method according to claim 12, characterized in that, The power generation device further includes a second power conversion circuit, the DC side of which is electrically connected to the first DC output terminal of the energy storage unit, and the AC side of which is adapted to be electrically connected to a load and / or the power grid; the method further includes: When the power generation device is operating in the mode of supplying power to the grid, a second PWM signal is generated based on the VSG control algorithm to drive the second power conversion circuit. When the power generation device is operating in the mode of supplying power to the load, a third PWM signal is generated based on the proportional-integral control algorithm to drive the second power conversion circuit.

16. The power generation control method according to claim 15, characterized in that, When the power generation device is operating in the mode of supplying power to the grid, generating a second PWM signal based on the VSG control algorithm to drive the second power conversion circuit includes: The actual values ​​of active power and reactive power output by the second power conversion circuit are determined based on the second sampling current on the AC side of the second power conversion circuit and the grid voltage. The expected value of the AC side voltage of the second power conversion circuit is determined by the VSG control algorithm based on the actual value of the active power and the actual value of the reactive power. A three-phase modulated wave is generated by performing current loop calculation based on the expected value of the AC side voltage of the second power conversion circuit, the second sampling current, and the grid voltage; The second PWM signal is generated by pulse width modulation based on the three-phase modulation wave.

17. The power generation control method according to claim 16, characterized in that, The step of determining the expected value of the AC side voltage of the second power conversion circuit using the VSG control algorithm based on the actual value of active power and the actual value of reactive power includes: Determine the amplitude and phase angle of the AC side voltage of the second power conversion circuit.

18. The power generation control method according to claim 15, characterized in that, When the power generation device is operating in the mode of supplying power to the load, generating a third PWM signal based on a proportional-integral control algorithm to drive the second power conversion circuit includes: The AC voltage setpoint is determined based on the given peak grid current and grid-side voltage phase. The average bridge arm voltage is determined by performing a proportional-resonance calculation based on the given AC voltage and the current output of the second power conversion circuit. The third PWM signal is generated by pulse width modulation based on the average bridge arm voltage.

19. The power generation control method according to claim 18, characterized in that, The step of generating the third PWM signal by pulse width modulation based on the average bridge arm voltage includes: The duty cycle of the third PWM signal is determined based on the bus voltage on the DC side of the first power conversion circuit and the average bridge arm voltage. The third PWM signal is generated based on the duty cycle of the third PWM signal.

20. A computer program product, characterized in that, include: The acquisition module is used to acquire the first sampling current on the output side of the electrically excited synchronous motor and the bus voltage on the DC side of the first power conversion circuit; The signal generation module is used to generate a first PWM signal based on the first sampled current and the bus voltage; The driving module is used to drive the first power conversion circuit using the first PWM signal.

21. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein when the computer program is executed by a processor, it implements the steps of the power generation control method as described in any one of claims 12-19.

22. An electric power system, characterized in that, It includes a power grid, a load, and a power generation device according to any one of claims 1-11, wherein the output side of the power generation device is electrically connected to the power grid and the load, respectively.

23. A vehicle, characterized in that, Includes the power generation device according to any one of claims 1-11.

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