New energy synchronous generator control method, device, equipment and medium

Abstract

The invention belongs to the technical field of new energy power generation, and particularly relates to a new energy synchronous generator control method and device, equipment and a medium. Aiming at the problem of weak dynamic response capability caused by insufficient physical inertia and power coupling of the new energy synchronous generator, the method comprises the following steps of: calculating instantaneous active power, reactive power and power factor angles by collecting grid-connected side voltage and current of an open winding motor; based on inertia enhancement control of rotor speed differential feedback, the active compensation amount is dynamically adjusted, and equivalent inertia amplification is realized; the excitation voltage is adjusted by combining apparent power droop control so as to adaptively adjust the internal potential of the open winding motor, and the fault ride-through capability is improved; through power factor angle droop and reactive PI compound control, decoupling adjustment of the voltage amplitude and phase of the converter is realized, and power coupling oscillation is suppressed. The inertia supporting capacity, the dynamic response speed and the operation range of the new energy synchronous generator can be improved, and the active supporting characteristics of the power grid frequency and voltage are enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy power generation, and particularly relates to a control method, device, equipment and medium for a new energy synchronous generator. Background Art

[0002] At present, new energy power generation is mainly connected to the power grid through a power electronic converter. Phase-locked control is adopted to follow the grid phase, and multi-loop control is used to achieve power conversion and maximum power output. In a fault state, limited by the tolerance of power electronic devices, the power electronic grid connection interface has problems such as insufficient over-current capacity and weak active support ability for the power grid in the fault state. In view of the problems existing in the power electronic grid connection interface, the prior art has proposed a topology of a new energy synchronous generator. The new energy synchronous generator mainly includes a three-phase converter, a Crowbar circuit, an open-winding motor, an excitation device and a grid connection switch. During steady-state operation, the current generated by the converter is connected to the grid after passing through the stator of the open-winding motor, so that the grid connection device has the characteristics of a synchronous motor. The control strategies of the new energy synchronous generator have been studied and achieved certain effects. Some prior arts have proposed a three-closed-loop control strategy based on the rotor phase difference, and some prior arts have proposed a grid-forming control strategy based on droop.

[0003] However, the three-closed-loop control strategy needs to rely on a phase-locked loop to achieve grid connection, which belongs to a grid-following control strategy and does not have the dynamic response characteristics and active support ability of a synchronous machine. The grid-forming strategy using droop control does not consider the influence of the internal electromotive force of the motor on the power transmission relationship, and there is cross-coupling between the active and reactive powers and the voltage amplitude, phase and internal electromotive force of the converter, and the operating range is limited. There is no load and prime mover on the rotor shaft of the open-winding motor, and the inertia of the new energy synchronous generator is small. The above two control methods have not studied the method of enhancing inertia. Summary of the Invention

[0004] The purpose of the present invention is to provide a control method, device, equipment and medium for a new energy synchronous generator to at least solve or improve one of the problems in the prior art.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: In the first aspect of the present invention, a control method for a new energy synchronous generator is provided. The new energy synchronous generator includes a converter and an open-winding motor, and the current generated by the converter is connected to the grid after passing through the stator of the open-winding motor. The method includes: Collect the three-phase voltage and three-phase current on the grid connection side of the open-winding motor, and calculate the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator according to the three-phase voltage and three-phase current; Calculate the power factor angle of the new energy synchronous generator according to the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator; Collect the rotor speed of the open-winding motor, and calculate the active power for inertia enhancement control based on the rotor speed of the open-winding motor. Subtract the active power for inertia enhancement control from the active power reference value of the new energy synchronous generator to obtain the first active power difference; calculate the apparent power of the new energy synchronous generator based on the reactive power reference value of the new energy synchronous generator and the first active power difference. Obtain the excitation voltage by drooping the apparent power of the new energy synchronous generator, and control the internal electromotive force of the open-winding motor according to the excitation voltage; perform droop control on the voltage amplitude and phase of the converter based on the power factor angle and instantaneous reactive power of the new energy synchronous generator.

[0006] Further, calculating the active power for inertia enhancement control based on the rotor speed of the open-winding motor includes: Differentiate the rotor speed of the open-winding motor, and multiply the differential calculation value of the rotor speed of the open-winding motor by the inertia enhancement multiple and the rotor moment of inertia of the new energy synchronous generator to obtain the active power for inertia enhancement control.

[0007] Further, obtaining the excitation voltage by drooping the apparent power of the new energy synchronous generator includes: Subtract the apparent power of the new energy synchronous generator from the apparent power reference value of the new energy synchronous generator to obtain the first apparent power difference, and obtain the excitation voltage by drooping the first apparent power difference.

[0008] Further, obtaining the excitation voltage by drooping the first apparent power difference includes: Pass the first apparent power difference through the first droop link to obtain the first droop signal, and sum the first droop signal and the excitation voltage steady-state value to obtain the excitation voltage.

[0009] Further, performing droop control on the voltage amplitude and phase of the converter based on the power factor angle and instantaneous reactive power of the new energy synchronous generator includes: Subtract the instantaneous reactive power from the reactive power reference value of the new energy synchronous generator to obtain the first reactive power difference, and pass the first reactive power difference through a PI link to obtain the first control signal; Subtract the power factor angle of the new energy synchronous generator from the power factor angle reference value to obtain the first power factor angle difference, and pass the first power factor angle difference through the second droop link to obtain the second droop signal; Sum the first control signal and the second control signal to obtain the converter angular frequency reference value; Pass the converter angular frequency reference value through the third droop link to obtain the third droop signal; sum the third droop signal and the converter voltage amplitude reference value to obtain the first superposition value; Superimpose the converter angular frequency reference value and the grid angular frequency reference value and then pass them through an integration link to obtain the converter phase value; The first superimposed value and the converter phase value are subjected to an inverse Park transformation to obtain the converter droop control voltage, and a switching control signal of the converter is generated according to the converter droop control voltage.

[0010] Further, the initial value of the converter phase value is calculated as follows:

[0011] where θ 10 is the initial value of the converter phase value; U vsc_ess is the reference value of the converter voltage amplitude; U g is the amplitude of the grid voltage phasor; U s is the amplitude of the terminal voltage phasor of the open-winding motor.

[0012] Further, the reference value of the converter voltage amplitude is calculated according to the following formula: When the converter operates in the first and fourth quadrants:

[0013] When the converter operates in the second and third quadrants:

[0014] where represents the power factor angle of the new energy synchronous generator.

[0015] In the second aspect of the present invention, a control device for a new energy synchronous generator is provided. The new energy synchronous generator includes a converter and an open-winding motor. The current generated by the converter is connected to the grid after passing through the stator of the open-winding motor. The device includes: A first calculation module, configured to collect three-phase voltages and three-phase currents on the grid-connected side of the open-winding motor, and calculate the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator according to the three-phase voltages and three-phase currents; A second calculation module, configured to calculate the power factor angle of the new energy synchronous generator according to the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator; A third calculation module, configured to collect the rotor speed of the open-winding motor, and calculate the inertia-enhanced control active power according to the rotor speed of the open-winding motor; A fourth calculation module, configured to subtract the inertia-enhanced control active power from the active power reference value of the new energy synchronous generator to obtain a first active power difference; and calculate the apparent power of the new energy synchronous generator according to the reactive power reference value of the new energy synchronous generator and the first active power difference; A control module is used to obtain the excitation voltage according to the apparent power droop of the new energy synchronous generator, and control the internal electromotive force of the open-winding motor according to the excitation voltage; and perform droop control on the voltage amplitude and phase of the converter according to the power factor angle and instantaneous reactive power of the new energy synchronous generator.

[0016] In the third aspect of the present invention, an electronic device is provided, including a processor and a memory. The processor is configured to execute a computer program stored in the memory to implement the new energy synchronous generator control method as described above.

[0017] In the fourth aspect of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium stores at least one instruction, and when the at least one instruction is executed by a processor, the new energy synchronous generator control method as described above is implemented.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The new energy synchronous generator control method provided by this solution, through the power-inertia coordinated control mechanism, embeds the inertia enhancement link into the active power control loop, can improve the equivalent inertia output ability of the new energy synchronous generator, and solves the problem of weak frequency dynamic response caused by insufficient physical inertia. Combining the apparent power droop control and the converter droop control, the decoupled adjustment of the internal electromotive force of the motor and the converter voltage is realized, enabling the system to have the dynamic characteristics of actively supporting the grid frequency and voltage, and at the same time broadening the stable operation range of the new energy synchronous generator.

[0019] This solution amplifies the physical rotational inertia into an equivalent inertia output through the differential feedback of the rotor speed and the amplification of the inertia gain, and can achieve k J times of inertia enhancement without additional flywheel devices. This method can adjust the active power compensation amount in real time by dynamically observing the speed change rate, can improve the speed and accuracy of inertia response, and solves the problems of high cost and response lag of traditional mechanical inertia enhancement methods.

[0020] This solution uses the apparent power droop to adjust the excitation voltage, and adaptively adjusts the internal electromotive force of the open-winding motor through closed-loop control. When the grid disturbance causes the apparent power to fluctuate, the system automatically reduces the internal electromotive force to increase the current output ability and avoid overcurrent of the converter; at the same time, the power balance is maintained through the steady-state excitation voltage compensation, solving the problems of limited power transmission and insufficient fault ride-through ability caused by the fixed internal electromotive force in traditional control.

[0021] This solution proposes a power factor angle-reactive power dual-mode droop control; among them, the power factor angle droop adjusts the converter phase through φe -K d2The droop characteristic directly controls θ1, improves the sensitivity of active power to the phase angle, and enhances the dynamic response; the reactive PI-frequency droop composite control superimposes reactive PI regulation on the forward channel of phase droop to achieve accurate tracking of reactive power. At the same time, the voltage amplitude is adaptively regulated through angular frequency droop, solving the oscillation problem caused by power coupling in traditional droop control. The initial phase calculation ensures that the operating point of the converter matches the grid voltage vector, avoiding transient shocks caused by phase mismatch and improving grid connection stability.

[0022] Through the calculation of the converter voltage reference in different quadrants, this scheme dynamically adjusts Uvsc_ess according to different power transmission directions, optimizing the phasor relationship between the converter voltage vector, the grid voltage, and the internal potential of the motor. It breaks through the bottleneck of limited operating quadrants in traditional control, enabling the new energy synchronous generator to flexibly adapt to the four-quadrant power transmission requirements and significantly expanding the system operating range. Brief Description of the Drawings

[0023] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 It is a flowchart of a control method for a new energy synchronous generator according to an embodiment of the present invention; Figure 2 It is an equivalent circuit diagram of grid connection of a new energy synchronous generator in an embodiment of the present invention; Figure 3 It is a relationship diagram of the converter voltage vector and the grid voltage vector in an embodiment of the present invention; Figure 4 It is a control block diagram of power decoupling and inertia enhancement of a new energy synchronous generator in an embodiment of the present invention; Figure 5 It is a schematic diagram of the output power and motor speed of a new energy synchronous generator in an embodiment of the present invention; Figure 6 It is a schematic diagram of the frequency support effect of different motor moments of inertia J in an embodiment of the present invention; Figure 7 It is a schematic diagram of the frequency support effect of different virtual moments of inertia in an embodiment of the present invention; Figure 8 It is a structural block diagram of a control device for a new energy synchronous generator according to an embodiment of the present invention; Figure 9 It is a structural block diagram of an electronic device according to an embodiment of the present invention. Detailed Embodiments

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0025] The following detailed descriptions are all exemplary descriptions, aiming to provide further detailed explanations for the present invention. Unless otherwise specified, all technical terms adopted in the present invention have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0026] The new energy synchronous generator involved in this solution includes an inverter and an open-winding motor, and the current generated by the inverter is connected to the grid after passing through the stator of the open-winding motor.

[0027] The steady-state grid-connected equivalent circuit of the new energy synchronous generator is as Figure 2 shown. The inverter in the new energy synchronous generator is equivalent to a voltage source, and the open-winding motor is equivalent to a series connection of a voltage source and an impedance. The value of the impedance is the synchronous reactance value of the open-winding motor, and the positive direction of the angle is defined as the angle at which any phasor leads the grid voltage counterclockwise U g angle.

[0028] According to Kirchhoff's voltage law, the grid-connected current of the new energy synchronous generator can be written as: (1) where represents the voltage phasor of the equivalent voltage source of the inverter, and j represents the imaginary unit.

[0029] The apparent power input from the new energy synchronous generator to the grid is calculated as: (2) where represents the conjugate of the current phasor .

[0030] According to the apparent power expression (2), the active power and reactive power of the new energy synchronous generator can be calculated respectively: (3) where is the amplitude of the grid voltage phasor, Figure 2 in which the grid voltage is taken as the reference, so it is considered that the phase of the grid voltage is always 0°; U vsc is the amplitude of the inverter voltage phasor, θ 1 is the phase of the inverter voltage phasor; is the amplitude of the internal electromotive force phasor of the open-winding motor, θ 2 is the phase of the internal electromotive force phasor of the open-winding motor, X s is the value of the synchronous reactance of the open-winding motor.

[0031] Simplifying the above equation (3) gives: (4) Equation (4) above indicates that the output power of the new energy synchronous generator consists of two parts, namely the power output by the converter and the power output by the open-winding machine. As Figure 3 shown, taking the active power and reactive power generated by new energy as an example, the converter voltage vector U vsc and the grid voltage vector U g have two relationships, namely: Figure 3 In (a), the converter voltage vector U vsc leads the grid voltage vector U g ; Figure 3 In (b), the converter voltage vector U vsc lags the grid voltage vector U g . The new energy synchronous generator usually operates under the leading condition in Figure 3 (a).

[0032] Embodiment 1 As Figure 1 and Figure 4 shown, a control method for a new energy synchronous generator includes the following steps: S1. Collect the three-phase voltage and three-phase current on the grid-connected side of the open-winding machine, and calculate the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator according to the three-phase voltage and three-phase current.

[0033] Specifically, the instantaneous active power and instantaneous reactive power are calculated by the following formula: (5) where v a , v b , v c respectively represent the three-phase voltages, i a , i b , i c respectively represent the three-phase currents, P e , Q e respectively represent the instantaneous active power and instantaneous reactive power.

[0034] S2. Calculate the power factor angle of the new energy synchronous generator according to the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator.

[0035] Specifically, with the induced internal electromotive force of the open-winding machine remaining unchanged, the power factor angle of the new energy synchronous generator is calculated by the following formula: (6) Among them, is the power factor angle of the new energy synchronous generator.

[0036] S3. Collect the rotor speed of the open winding motor, and calculate the active power for inertia enhancement control based on the rotor speed of the open winding motor.

[0037] The open winding motor has a physical moment of inertia. Due to the absence of a prime mover, the moment of inertia is small. There are two ways to enhance the moment of inertia level of the open winding motor. One is to increase the flywheel on the rotor of the open winding motor to enhance the moment of inertia level; the other is to enhance the moment of inertia level through the active power control link by responding to the change in rotor speed. In this solution, the first method is adopted.

[0038] Specifically, calculating the active power for inertia enhancement control based on the rotor speed of the open winding motor includes: performing differential calculation on the rotor speed of the open winding motor, multiplying the differential calculation value of the rotor speed of the open winding motor by the inertia enhancement multiple and the rotor moment of inertia of the new energy synchronous generator to obtain the active power for inertia enhancement control, thereby realizing increasing the moment of inertia through the active power control link.

[0039] The control equation for increasing the moment of inertia through the active power control link is as follows: (7) Where P J is the active power for inertia enhancement control; ω r is the rotor speed of the open winding motor; k J is the inertia enhancement multiple; J is the rotor moment of inertia of the open winding motor.

[0040] Through the observation of the rotor speed change of the new energy synchronous generator and the inertia enhancement control, the output of the rotor physical moment of inertia k J times the moment of inertia is realized. The inertia enhancement control strategy improves the response speed and control accuracy of the inertia output by observing the motor speed, and can achieve an inertia output effect close to that of adding a flywheel.

[0041] S4. Subtract the active power for inertia enhancement control from the active power reference value of the new energy synchronous generator to obtain the first active power difference; calculate the apparent power of the new energy synchronous generator according to the reactive power reference value of the new energy synchronous generator and the first active power difference.

[0042] Specifically, the apparent power of the new energy synchronous generator can be obtained by the following formula: (8) S5. Obtain the excitation voltage according to the apparent power droop of the new energy synchronous generator, and control the internal electromotive force of the open winding motor according to the excitation voltage.

[0043] Specifically, this solution sets the voltage and amplitude of the converter to remain unchanged. From the phasor relationship Figure 3 in (a), it can be seen that: (9) and it satisfies: (10) wherein, and respectively represent the terminal voltage of the new energy synchronous generator and the stator current of the open-winding motor; E 0 represents the induced internal electromotive force of the open-winding motor; The induced internal electromotive force E 0 of the open-winding motor is related to the current When E 0 decreases, X s I s increases, and the current I s increases, and the apparent power S e of the new energy synchronous generator increases, that is, the apparent power S e of the new energy synchronous generator is inversely proportional to the induced internal electromotive force E 0 of the open-winding motor. Therefore, this solution uses the apparent power S e of the new energy synchronous generator to droop to obtain the excitation voltage u f , and further controls the internal electromotive force E 0 of the motor, and the droop coefficient is K d1 .

[0044] Specifically, obtaining the excitation voltage according to the apparent power droop of the new energy synchronous generator includes: subtracting the apparent power S ref reference value of the new energy synchronous generator from the apparent power S e of the new energy synchronous generator to obtain the first apparent power difference, and drooping according to the first apparent power difference to obtain the excitation voltage.

[0045] More specifically, obtaining the excitation voltage according to the first apparent power difference includes: passing the first apparent power difference through the first droop link to obtain the first droop signal, and summing the first droop signal and the steady-state value of the excitation voltage to obtain the excitation voltage.

[0046] S6. Perform droop control on the voltage amplitude and phase of the converter according to the power factor angle and instantaneous reactive power of the new energy synchronous generator.

[0047] ThroughFigure 3 From the phasor diagram of (a), it can be found that the power factor angle of the new energy synchronous generator φ e The included angle of the droop converter θ The sensitivity of 1 is better than that of the voltage amplitude of the droop converter U vsc Therefore, in this scheme, the voltage phase of the converter is obtained by drooping through the power factor angle of the new energy synchronous generator φ e 1, and the droop coefficient θ 1, droop coefficient K d2 ; and through ω vsc The voltage amplitude of the converter is obtained by drooping U vsc , and the droop coefficient K d3 . In order to realize the change of the power tracking instruction of the system, a Q e PI control is added to the forward channel of the converter phase droop to achieve accurate output of reactive power.

[0048] Specifically, according to the power factor angle and instantaneous reactive power of the new energy synchronous generator, the voltage amplitude and phase of the converter are droop-controlled, including: subtracting the instantaneous reactive power Q ref from the reactive power reference value Q e of the new energy synchronous generator to obtain the first reactive power difference, and passing the first reactive power difference through a PI link to obtain the first control signal; subtracting the power factor angle φ ref of the new energy synchronous generator from the power factor angle reference value φ e to obtain the first power factor angle difference, and passing the first power factor angle difference through a second droop link to obtain the second droop signal; summing the first control signal and the second control signal to obtain the converter angular frequency reference value ω vsc ; passing the converter angular frequency reference value ω vsc through a third droop link to obtain the third droop signal; summing the third droop signal and the converter voltage amplitude reference value U vsc_ess to obtain the first superposition value; superimposing the converter angular frequency reference value ω vsc and the grid angular frequency reference value ω ess and passing through an integration link to obtain the converter phase value θ 1; summing the first superposition value and the converter phase value θ1. Perform the inverse Park transformation to obtain the droop control voltage of the converter. u ref , and generate the switching control signal of the converter according to the droop control voltage of the converter. u ref

[0049] It should be noted that the initial values of the converter voltage amplitude reference value U vsc_ess and the converter phase value θ 1 θ 10 determine whether the new energy synchronous generator can operate at the given operating point.

[0050] The initial value of the converter phase value is calculated in the following manner: θ 10 The active power set value of the converter is P * , and the reactive power set value is Q * , then the amplitude of the output current of the converter is: (11) The power factor of the converter is: (12) According to the positive and negative of the converter output power, it can be divided into four operating quadrants, namely Quadrant I ( P * > 0, Q * > 0), Quadrant II ( P * < 0, Q * > 0), Quadrant III ( P * < 0, Q * < 0), and Quadrant IV ( P * > 0, Q * < 0).

[0051] When the converter operates in Quadrants I and IV, according to the vector diagram analysis, it can be known that: (13) According to the above formula (13), the converter voltage amplitude reference value U vsc_ess during operation in Quadrants I and IV can be obtained, and then by applying the cosine theorem formula (14) once again, the converter phase θInitial value of 1 θ 10 , as follows: (14) Similarly, when the converter is running in quadrants II and III, according to the vector diagram analysis: (15) According to the above formula (15), the reference value of the converter voltage amplitude in the operation of the II and III quadrants can be obtained: U vsc_ess , and then apply the cosine theorem (14) to calculate the converter phase in the operation of the II and III quadrants θ 1 Initial value θ 10 .

[0052] In the above formula, θ 10 is the initial value of the converter phase value; U vsc_ess is the reference value of the converter voltage amplitude; U g is the amplitude of the grid voltage phasor; U s is the terminal voltage phasor amplitude of the open-winding motor.

[0053] In order to further verify the effectiveness of the new energy synchronous generator control method provided by this scheme, a simulation example is given below, as follows: by Figure 4 Taking the new energy synchronous generator topology shown in the figure as an example, a new energy synchronous generator model is established in the simulation, and the active power command and reactive power command of the new energy synchronous generator are set to 500kW and 150kVar respectively (the reference value is 500kVA). Through calculation, it is determined that the steady-state value of the phase of the modulation voltage reference value should be 52.6°. The above parameters are loaded into the control method and the simulation is run. The steady-state response result is as follows: Figure 5 As shown, Figure 5 (a) in the figure is the active power output of the new energy synchronous generator. Figure 5 (b) is the reactive power output of the new energy synchronous generator. Figure 5 (c) is the speed of the open-winding synchronous motor. The new energy synchronous generator follows the power command and stably outputs 500kW of active power and 150kVar of reactive power. At the 5th second, the reference value of active power is changed to 0.8pu, and the output power of active power changes accordingly. The output value of reactive power returns to the set reference value after a short fluctuation, indicating that the control strategy proposed in the present invention can realize the decoupling control of active and reactive power.

[0054] To verify the frequency support effect of the moment of inertia of a new energy synchronous generator under grid load disturbances, 200 kW is suddenly increased at 4 s, and the frequency changes when the moments of inertia are 38, 50, and 62 kg•m 2 are as follows Figure 6 shown. The simulation results show that the larger the moment of inertia of the new energy synchronous generator, the smaller the change in the grid frequency and the better the frequency support effect.

[0055] To verify the frequency support effect of the inertia support control of a new energy synchronous generator under grid load disturbances, 200 kW is suddenly increased at 4 s, and the frequency changes when the virtual inertia parameters k J are 5, 7, and 9 respectively are as follows Figure 7 shown. The simulation results show that the larger the virtual inertia parameter k J in the control, the smaller the change in the grid frequency and the better the frequency support effect, indicating that the control strategy proposed in the present invention can enhance the inertia level of the new energy synchronous generator and proves the effectiveness of the present invention.

[0056] Embodiment 2 As Figure 8 shown, based on the same inventive concept as the above embodiment, the present invention also provides a control device for a new energy synchronous generator. The new energy synchronous generator includes an inverter and an open-winding motor. The current generated by the inverter is connected to the grid after passing through the stator of the open-winding motor. The device includes: A first calculation module, configured to collect the three-phase voltage and three-phase current on the grid-connected side of the open-winding motor, and calculate the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator according to the three-phase voltage and three-phase current; A second calculation module, configured to calculate the power factor angle of the new energy synchronous generator according to the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator; A third calculation module, configured to collect the rotor speed of the open-winding motor, and calculate the active power for inertia enhancement control according to the rotor speed of the open-winding motor; A fourth calculation module, configured to subtract the active power for inertia enhancement control from the active power reference value of the new energy synchronous generator to obtain a first active power difference; calculate the apparent power of the new energy synchronous generator according to the reactive power reference value of the new energy synchronous generator and the first active power difference; A control module, configured to obtain the excitation voltage according to the droop of the apparent power of the new energy synchronous generator, control the internal electromotive force of the open-winding motor according to the excitation voltage; perform droop control on the voltage amplitude and phase of the inverter according to the power factor angle and instantaneous reactive power of the new energy synchronous generator.

[0057] Embodiment 3 As Figure 9As shown in the figure, the present invention also provides an electronic device 100 for implementing a control method for a new energy synchronous generator; The electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0058] The memory 101 can be used to store the computer program 103. The processor 102 realizes the steps of a control method for a new energy synchronous generator in Embodiment 1 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101.

[0059] The memory 101 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the electronic device 100 (such as audio data, etc.). In addition, the memory 101 can include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0060] The at least one processor 102 can be a Central Processing Unit (CPU), and can also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 can be a microprocessor or the processor 102 can also be any conventional processor, etc. The processor 102 is the control center of the electronic device 100, and connects various parts of the entire electronic device 100 through various interfaces and lines.

[0061] The memory 101 in the electronic device 100 stores multiple instructions to implement a control method for a new energy synchronous generator. The processor 102 can execute the multiple instructions to thereby implement: Collect the three-phase voltage and three-phase current on the grid-connected side of the open-winding motor, and calculate the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator according to the three-phase voltage and three-phase current; The power factor angle of the new energy synchronous generator is calculated based on the instantaneous active power and the instantaneous reactive power output by the new energy synchronous generator; The rotor speed of the open-winding motor is collected, and the active power of inertia enhancement control is calculated based on the rotor speed of the open-winding motor; Subtract the active power of inertia enhancement control from the active power reference value of the new energy synchronous generator to obtain the first active power difference; calculate the apparent power of the new energy synchronous generator based on the reactive power reference value of the new energy synchronous generator and the first active power difference; The excitation voltage is obtained by drooping the apparent power of the new energy synchronous generator, and the internal electromotive force of the open-winding motor is controlled according to the excitation voltage; the voltage amplitude and phase of the converter are droop-controlled according to the power factor angle and the instantaneous reactive power of the new energy synchronous generator.

[0062] Embodiment 4 If the modules / units integrated in the electronic device 100 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, to implement all or part of the processes in the above method embodiments of the present invention, it can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device that can carry the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory and read-only memory (ROM, Read-Only Memory).

[0063] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0064] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combinations of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices produce means for implementing the functions specified in one flow Figure 1 one flow or more flows and / or blocks Figure 1 or means for implementing the functions specified in one block or more blocks.

[0065] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing devices to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including instruction means that implement the functions specified in one flow Figure 1 one flow or more flows and / or blocks Figure 1 or means for implementing the functions specified in one block or more blocks.

[0066] These computer program instructions can also be loaded onto a computer or other programmable data processing devices, such that a series of operation steps are executed on the computer or other programmable devices to produce a computer-implemented process, so that the instructions executed on the computer or other programmable devices provide steps for implementing the functions specified in one flow Figure 1 one flow or more flows and / or blocks Figure 1 or means for implementing the functions specified in one block or more blocks.

[0067] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "example", "specific example", etc. mean 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 invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0068] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: still can modify the specific implementation manners of the present invention or make equivalent replacements, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A control method for a new energy synchronous generator, the new energy synchronous generator comprising a converter and an open-winding motor, and the current generated by the converter is connected to the grid after passing through the stator of the open-winding motor, characterized in that, The method includes: Collect the three-phase voltage and three-phase current on the grid-connected side of the open-winding motor, and calculate the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator according to the three-phase voltage and three-phase current; Calculate the power factor angle of the new energy synchronous generator based on the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator; Collect the rotor speed of the open-winding motor, and calculate the active power for inertia enhancement control according to the rotor speed of the open-winding motor; Subtract the active power for inertia enhancement control from the active power reference value of the new energy synchronous generator to obtain the first active power difference; calculate the apparent power of the new energy synchronous generator according to the reactive power reference value of the new energy synchronous generator and the first active power difference; Obtain the excitation voltage by drooping the apparent power of the new energy synchronous generator, control the internal electromotive force of the open-winding motor according to the excitation voltage; perform drooping control on the voltage amplitude and phase of the converter according to the power factor angle and instantaneous reactive power of the new energy synchronous generator.

2. The method according to claim 1, wherein Calculating the active power for inertia enhancement control according to the rotor speed of the open-winding motor includes: Perform differential calculation on the rotor speed of the open-winding motor, and multiply the differential calculation value of the rotor speed of the open-winding motor by the inertia enhancement multiple and the rotor moment of inertia of the new energy synchronous generator to obtain the active power for inertia enhancement control.

3. The method according to claim 1, characterized in that Obtaining the excitation voltage by drooping the apparent power of the new energy synchronous generator includes: Subtract the apparent power of the new energy synchronous generator from the apparent power reference value of the new energy synchronous generator to obtain the first apparent power difference, and obtain the excitation voltage by drooping according to the first apparent power difference.

4. The method according to claim 3, characterized in that Obtaining the excitation voltage by drooping according to the first apparent power difference includes: Pass the first apparent power difference through the first drooping link to obtain the first drooping signal, and sum the first drooping signal and the excitation voltage steady-state value to obtain the excitation voltage.

5. The method according to claim 1, characterized in that Performing drooping control on the voltage amplitude and phase of the converter according to the power factor angle and instantaneous reactive power of the new energy synchronous generator includes: Subtract the instantaneous reactive power from the reactive power reference value of the new energy synchronous generator to obtain the first reactive power difference, and pass the first reactive power difference through a PI link to obtain the first control signal; Subtract the power factor angle of the new energy synchronous generator from the power factor angle reference value to obtain the first power factor angle difference, and pass the first power factor angle difference through the second drooping link to obtain the second drooping signal; Sum the first control signal and the second control signal to obtain the converter angular frequency reference value; Pass the converter angular frequency reference value through the third drooping link to obtain the third drooping signal; sum the third drooping signal and the converter voltage amplitude reference value to obtain the first superimposed value; Superimpose the converter angular frequency reference value and the grid angular frequency reference value and then pass through an integration link to obtain the converter phase value; Perform an inverse Park transformation on the first superimposed value and the converter phase value to obtain the converter drooping control voltage, and generate the switch control signal of the converter according to the converter drooping control voltage.

6. The method according to claim 5, characterized in that, The initial value of the converter phase value is calculated as follows: Among them, θ 10 is the initial value of the converter phase value; U vsc_ess is the reference value of the converter voltage amplitude; U g is the amplitude of the grid voltage phasor; U s is the amplitude of the terminal voltage phasor of the open-winding motor.

7. The method according to claim 6, wherein The converter voltage amplitude reference value is calculated according to the following formula: When the converter operates in the I and IV quadrants: When the converter operates in the II and III quadrants: Among them, represents the power factor angle of the new energy synchronous generator.

8. A control device for a new energy synchronous generator, the new energy synchronous generator comprising a converter and an open-winding motor, and the current generated by the converter is connected to the grid after passing through the stator of the open-winding motor, characterized in that, The device includes: The first calculation module is configured to collect the three-phase voltage and three-phase current on the grid-connected side of the open-winding motor, and calculate the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator according to the three-phase voltage and three-phase current; The second calculation module is configured to calculate the power factor angle of the new energy synchronous generator according to the instantaneous active power and instantaneous reactive power output by the new energy synchronous generator; The third calculation module is configured to collect the rotor speed of the open-winding motor, and calculate the active power for inertia enhancement control according to the rotor speed of the open-winding motor; The fourth calculation module is configured to subtract the active power for inertia enhancement control from the active power reference value of the new energy synchronous generator to obtain a first active power difference; calculate the apparent power of the new energy synchronous generator according to the reactive power reference value of the new energy synchronous generator and the first active power difference; The control module is configured to obtain the excitation voltage according to the droop of the apparent power of the new energy synchronous generator, control the internal electromotive force of the open-winding motor according to the excitation voltage; perform droop control on the voltage amplitude and phase of the converter according to the power factor angle and instantaneous reactive power of the new energy synchronous generator.

9. An electronic device, characterized in that, It includes a processor and a memory, and the processor is configured to execute a computer program stored in the memory to implement the new energy synchronous generator control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one instruction, and when the at least one instruction is executed by the processor, the new energy synchronous generator control method according to any one of claims 1 to 7 is implemented.

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