Generator inductance detection method, device, system and storage medium

Abstract

The embodiment of the present invention provides a method, device, system and storage medium for detecting the inductance of a generator. The method includes: obtaining a first operating parameter of the generator collected by a power analysis device and a second operating parameter of the generator collected by a converter; determining the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator according to the first operating parameter, determining the internal power factor angle of the generator according to the second operating parameter, calculating the d-axis inductance value and q-axis inductance value of the generator according to the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude, phase current fundamental frequency and internal power factor angle, and being able to detect the inductance value of the generator in real time during the operation of the generator.

Description

Technical Field

[0001] The present invention relates to the technical field of generator detection, and in particular to a generator inductance detection method, device, system and storage medium. Background Art

[0002] At present, generators are widely used in various aspects of the industrial field, such as wind power generation, thermal power generation, etc. Generators need to be combined with corresponding converter control to achieve ideal results. Among them, the inductance value of the generator is an important parameter in converter control, which is related to the stability of the generator and the operation control accuracy.

[0003] However, the traditional inductance measurement scheme is to lock the generator at a specified position and then measure the inductance value. The inductance value can only be detected when the generator is locked. Summary of the invention

[0004] The embodiments of the present invention provide a method, device, system and storage medium for detecting the inductance of a generator, which can detect the inductance value of the generator in real time during the operation of the generator.

[0005] In a first aspect, an embodiment of the present invention provides a method for detecting inductance of a generator, wherein the generator is connected to a power analysis device and a converter respectively, and the method comprises:

[0006] Acquire a first operating parameter of the generator collected by the power analysis device and a second operating parameter of the generator collected by the converter; wherein the first operating parameter includes a phase voltage, a first back electromotive force and a first phase current, and the second operating parameter includes a first rotor position angle, a second back electromotive force and a second phase current;

[0007] Determine the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator according to the first operating parameter;

[0008] determining an internal power factor angle of the generator according to the second operating parameter;

[0009] The d-axis inductance and q-axis inductance of the generator are calculated according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency and the internal power factor angle.

[0010] In a second aspect, an embodiment of the present invention provides an inductance detection device for a generator, wherein the generator is connected to a power analysis device and a converter, respectively, and the device comprises:

[0011] An acquisition module, used to acquire a first operating parameter of the generator acquired by the power analysis device and a second operating parameter of the generator acquired by the converter; wherein the first operating parameter includes a phase voltage, a first back electromotive force and a first phase current, and the second operating parameter includes a first rotor position angle, a second back electromotive force and a second phase current;

[0012] A determination module, used to determine the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator according to the first operating parameter;

[0013] The determination module is further used to determine the internal power factor angle of the generator according to the second operating parameter;

[0014] The calculation module is used to calculate the d-axis inductance value and the q-axis inductance value of the generator according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency and the internal power factor angle.

[0015] In a third aspect, an embodiment of the present invention provides an inductance detection system for a generator, the system comprising:

[0016] A power analysis device, the power analysis device is connected to the generator, and the power analysis device is used to collect a first operating parameter of the generator; wherein the first operating parameter includes a phase voltage, a first back electromotive force, and a first phase current;

[0017] A converter, the converter is connected to the generator, and the converter is used to collect a second operating parameter of the generator; wherein the second operating parameter includes a first rotor position angle, a second back electromotive force, and a second phase current;

[0018] The inductance detection device is connected to the power analysis device and the converter respectively, and is used to obtain the first operating parameter and the second operating parameter; according to the first operating parameter, the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude and the phase current fundamental frequency of the generator are determined; according to the second operating parameter, the internal power factor angle of the generator is determined; according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency and the internal power factor angle, the d-axis inductance value and the q-axis inductance value of the generator are calculated.

[0019] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the method for detecting the inductance of the generator described in the first aspect or any implementable manner of the first aspect is implemented.

[0020] An embodiment of the present invention provides a generator inductance detection method, device, system and storage medium, which can obtain a first operating parameter of the generator collected by a power analysis device and a second operating parameter of the generator collected by a converter, and then determine the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator according to the first operating parameter, and determine the internal power factor angle of the generator according to the second operating parameter, and then calculate the d-axis inductance value and q-axis inductance value of the generator according to the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude, phase current fundamental frequency and internal power factor angle, and further, without locking the generator at a specified position, the d-axis inductance value and q-axis inductance value of the generator can be detected in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following briefly introduces the drawings required for use in the embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 is a structural schematic diagram of an inductance detection system for a generator provided by an embodiment of the present invention;

[0023] Figure 2 is a structural schematic diagram of another inductance detection system for a generator provided by an embodiment of the present invention;

[0024] Figure 3 is a structural schematic diagram of another inductance detection system for a generator provided by an embodiment of the present invention;

[0025] Figure 4 It is a structural schematic diagram of an electric-to-optical signal transmitter provided by an embodiment of the present invention;

[0026] Figure 5 is a flow chart of a method for detecting inductance of a generator provided by an embodiment of the present invention;

[0027] Figure 6 is a vector diagram of the d-axis and q-axis of a generator provided by an embodiment of the present invention;

[0028] Figure 7 is a structural schematic diagram of an inductance detection device for a generator provided by an embodiment of the present invention;

[0029] Figure 8 It is a schematic diagram of the hardware structure of an inductance detection device for a generator provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and Examples. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0032] The inductance of the generator includes the d-axis inductance and the q-axis inductance, which are important parameters in the converter control. The direction of the positive maximum value of the fundamental wave of the sinusoidal magnetic field is defined as the positive direction of the d-axis, and the direction perpendicular to it and lagging 90 degrees is defined as the positive direction of the q-axis. The d-axis inductance and q-axis inductance are directly related to the decoupling, stability and operation control accuracy in the generator control. For example, whether the generator can operate stably in the high-speed weak magnetic field area; whether the motor can fully utilize the magnetic resistance torque generated by the unequal d-axis inductance and q-axis inductance in the non-weak magnetic field area to achieve optimal control of the torque-to-current ratio, etc.

[0033] The traditional inductance measurement scheme is to lock the generator at a specified position, for example, at the d-axis and q-axis positions, and then measure the inductance value. The inductance value can only be detected when the generator is locked.

[0034] In order to solve the problems of the prior art, the embodiments of the present invention provide a method, device, system and storage medium for detecting the inductance of a generator. The first operating parameter of the generator collected by the power analysis device and the second operating parameter of the generator collected by the converter can be obtained, and then the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator are determined according to the first operating parameter, and the internal power factor angle of the generator is determined according to the second operating parameter, and then the d-axis inductance value and q-axis inductance value of the generator are calculated according to the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude, phase current fundamental frequency and internal power factor angle, and then the d-axis inductance value and q-axis inductance value of the generator are calculated, and the d-axis inductance value and q-axis inductance value of the generator can be detected in real time without locking the generator at a specified position.

[0035] The following first introduces the inductance detection system of the generator provided by the embodiment of the present invention.

[0036] Figure 1 is a schematic diagram of the structure of an inductance detection system for a generator provided by an embodiment of the present invention, such as Figure 1 As shown, the inductance detection system is used to detect the inductance of the generator 110 , and may include a power analysis device 120 , a converter 130 , and an inductance detection device 140 .

[0037] The power analysis device 120 may be connected to the generator 110 to collect the first operating parameters of the generator 110. The power analysis device 120 may be a power analyzer, and the generator 110 may be a permanent magnet generator or an excitation generator, such as a direct-drive permanent magnet generator, which may be applied to a wind turbine generator set. The first operating parameters include a phase voltage, a first back electromotive force, and a first phase current.

[0038] The converter 130 may be connected to the generator 110 to collect the second operating parameters of the generator 110. The second operating parameters include the first rotor position angle, the second back electromotive force and the second phase current.

[0039] The inductance detection device 140 can be connected to the power analysis device 120 and the converter 130 respectively, and is used to obtain the first operating parameter and the second operating parameter, and determine the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator according to the first operating parameter, and determine the internal power factor angle of the generator according to the second operating parameter, and then calculate the d-axis inductance value and q-axis inductance value of the generator according to the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude, phase current fundamental frequency and internal power factor angle.

[0040] In some embodiments, see Figure 2The inductance detection system may further include a rotor position sensor 150, such as an encoder. The generator 110 may include a rotor (not shown in the figure) inside, and the generator 110 may also include an output terminal 111 (such as Figure 3 shown).

[0041] The rotor position sensor 150 may be electrically connected to the converter 130, and is used to collect a first rotor position angle of the rotor, and send the first rotor position angle to the converter 130. Optionally, when the rotor position sensor 150 is a contact encoder, the rotor position sensor 150 is mechanically connected to the rotor. When the rotor position sensor 150 is a non-contact encoder, it may be installed with the rotor in a non-contact manner.

[0042] The output terminal 111 is the power output terminal of the generator 110, and can be connected to the power analysis device 120 and the converter 130 respectively, and is used to output the power generated by the generator 110. The power analysis device 120 can calculate the first operating parameter through the output power. The converter 130 can calculate the second operating parameter through the output power.

[0043] Since the distance between the rotor position sensor 150 and the converter 130 is relatively long and the electrical signal is susceptible to electromagnetic interference, the first rotor position angle can be transmitted to the converter 130 by converting the electrical signal into an optical signal. Figure 2 The inductance detection system may further include an electric-to-optical signal transmitter 160 , which is respectively connected to the rotor position sensor 150 and the converter 130 , and is used to convert the first rotor position angle into an optical signal and send the optical signal to the converter 130 .

[0044] In the embodiment of the present invention, the first operating parameter of the generator 110 collected by the power analysis device 120 and the second operating parameter of the generator 110 collected by the converter 130 can be obtained, and then the inductance detection device 140 determines the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator 110 according to the first operating parameter, and determines the internal power factor angle of the generator 110 according to the second operating parameter, and then calculates the d-axis inductance value and q-axis inductance value of the generator 110 according to the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude, phase current fundamental frequency and internal power factor angle, and then, without locking the generator 110 at a specified position, the d-axis inductance value and q-axis inductance value of the generator 110 can be detected in real time.

[0045] The embodiment of the present invention also provides a structural schematic diagram of another inductance detection system of a generator, such as Figure 3 As shown, Figure 2The inductance detection system may further include a motor 170 and a rotating shaft 180 .

[0046] The rotor is mechanically connected to the output shaft (not shown) of the motor 170 via the rotating shaft 180. In one example, the rotating shaft 180 may be the rotating shaft of the generator 110, the rotating shaft of the motor 170, or a rotating shaft independent of the generator 110 and the motor 170. In one example, the rotor position sensor 150 may be mechanically connected to the rotating shaft 180, or may be installed in a non-contact manner with the rotating shaft 180. The rotor position sensor 150 may be used to collect the position angle of the rotating shaft 180. Since the rotor is coaxially connected to the rotating shaft 180, which is equivalent to the rotor position sensor 150 being connected to the rotor, the position angle of the rotating shaft 180 is the first rotor position angle of the rotor.

[0047] By adopting the motor-to-motor dragging method, the motor 170 is used to drag the rotor to move, so as to simulate the working state of the generator, so as to flexibly calculate the d-axis inductance value and the q-axis inductance value of the generator.

[0048] Figure 4 is a schematic diagram of the structure of an electrical-to-optical signal transmitter provided by an embodiment of the present invention, such as Figure 4 As shown, the electric-to-optical signal transmitter 160 may include a data transceiver 161, an electric-to-optical adapter board 162, and an optical fiber transceiver 163. The electric-to-optical adapter board 162 may be used to provide a conversion interface between the data transceiver 161 and the optical fiber transceiver 163. The interface signal of the rotor position sensor 150 may be an RS485 signal, and the data transceiver 161 may be an RS485 transceiver. The data transceiver 161 is used to convert the differentially transmitted RS485 signal into a single-line serial signal, and the optical fiber transceiver 163 is used to convert the single-line serial signal into an optical signal, and the optical signal is transmitted to the converter 130 in a serial communication manner.

[0049] In some embodiments, the inductance detection system may further include a resistance testing device, such as a resistance tester, for collecting the phase resistance of the generator 110 before calculating the d-axis inductance value and the q-axis inductance value of the generator according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency and the internal power factor angle. By collecting the phase resistance in real time, the accuracy of the phase resistance is improved. Then the inductance detection device 140 can obtain the phase resistance, and then calculate the d-axis inductance value and the q-axis inductance value according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency, the internal power factor angle and the phase resistance, so as to improve the accuracy of the calculation of the d-axis inductance value and the q-axis inductance value.

[0050] The following is an introduction to the inductance detection method of the generator provided by the embodiment of the present invention. The inductance detection method of the generator can be Figure 1 or Figure 2 or Figure 3 The inductance detection device 140 shown in FIG. 1 or the functional modules in the inductance detection device 140 are executed.

[0051] Figure 5 FIG. 1 is a flow chart of a method for detecting inductance of a generator provided by an embodiment of the present invention. Figure 5 As shown, the inductance detection method of the generator may include S510 to S540. Figures 1 to 3 .

[0052] S510 , obtaining a first operating parameter of the generator 110 collected by the power analysis device 120 and a second operating parameter of the generator collected by the converter 130 .

[0053] The generator 110 is respectively connected to the power analysis device 120 and the converter 130. The first operating parameter includes a phase voltage, a first back electromotive force and a first phase current, and the second operating parameter includes a first rotor position angle, a second back electromotive force and a second phase current.

[0054] In some embodiments, multiple first operating parameters and multiple second operating parameters within a specified time period, such as 5 seconds, can be obtained, and a first average value of the multiple first operating parameters and a second average value of the multiple second operating parameters can be calculated; the first average value is used as the first operating parameter, and the second average value is used as the second operating parameter to participate in the calculation. Specifically, the average values ​​of the phase voltage, the first back electromotive force and the first phase current can be calculated respectively, and the average values ​​of the first rotor position angle, the second back electromotive force and the second phase current can be calculated respectively, so as to reduce random errors in the calculation.

[0055] S520, determining the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator 110 according to the first operating parameter.

[0056] In some embodiments, feature extraction can be performed on the phase voltage to obtain the phase voltage fundamental amplitude and the phase voltage fundamental phase, feature extraction can be performed on the first back electromotive force to obtain the back electromotive force fundamental amplitude, feature extraction can be performed on the first phase current to obtain the phase current fundamental amplitude, the first phase current fundamental phase and the phase current fundamental frequency, and then the phase voltage fundamental phase and the first phase current fundamental phase are subtracted, and the first difference between the phase voltage fundamental phase and the first phase current fundamental phase is used as the power factor angle.

[0057] As an example, a phase-locked loop (PLL) algorithm can be used to extract features of the phase voltage to obtain the phase voltage fundamental amplitude and the phase voltage fundamental phase, the PLL algorithm can be used to extract features of the first back EMF to obtain the back EMF fundamental amplitude, and the PLL algorithm can be used to extract features of the first phase current to obtain the phase current fundamental amplitude, the first phase current fundamental phase, and the phase current fundamental frequency. For example, the use of the PLL algorithm to extract features of the first phase current can be understood as the first phase current passing through the calculation links of converting the abc coordinate system to the αβ coordinate system, the αβ coordinate system to the dq coordinate system, PI regulation, and integration to obtain the phase current fundamental amplitude, the first phase current fundamental phase, and the phase current fundamental frequency of the first phase current.

[0058] As another example, the filtering extraction algorithm can be used to extract the features of the phase voltage to obtain the phase voltage fundamental amplitude and the phase voltage fundamental phase, the filtering extraction algorithm can be used to extract the features of the first back electromotive force to obtain the back electromotive force fundamental amplitude, and the filtering extraction algorithm can be used to extract the features of the first phase current to obtain the phase current fundamental amplitude, the first phase current fundamental phase and the phase current fundamental frequency. For example, the use of the filtering extraction algorithm to extract the features of the first phase current can be understood as respectively determining the three-phase current coordinates of the first phase current in the abc coordinate system, and then converting the three-phase current coordinates into two-phase current coordinates in the αβ coordinate system, and then low-pass filtering to obtain the fundamental wave corresponding to the first phase current, and determining the phase current fundamental amplitude and the phase current fundamental frequency of the first phase current based on the obtained fundamental wave, and converting the two-phase current coordinates into synchronous current coordinates in the dq coordinate system, and performing inverse tangent calculation based on the synchronous current coordinates to obtain the first phase current fundamental phase of the first phase current.

[0059] S530: Determine the internal power factor angle of the generator 110 according to the second operating parameter.

[0060] In some embodiments, the first rotor position angle can be zeroed using the second back-EMF to obtain the second rotor position angle after zeroing. Specifically, the back-EMF fundamental phase of the second back-EMF can be calculated, and the zero point of the first rotor position angle is overlapped with the zero point of the back-EMF fundamental phase to obtain the second rotor position angle. Zeroing can eliminate the measurement error of the first rotor position angle and improve the accuracy of the rotor position angle, so as to accurately calculate the d-axis inductance value and the q-axis inductance value.

[0061] At the same time, the second phase current can be feature extracted to obtain the second phase current fundamental phase. As an example, the second phase current can be feature extracted using a PLL algorithm to obtain the second phase current fundamental phase. As another example, the second phase current can be feature extracted using a filter extraction algorithm to obtain the second phase current fundamental phase. Then, the second phase current fundamental phase and the second rotor position angle are subtracted, and the second difference between the second phase current fundamental phase and the second rotor position angle is used as the internal power factor angle.

[0062] S540 , calculating the d-axis inductance and the q-axis inductance of the generator 110 according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency and the internal power factor angle.

[0063] In an embodiment of the present invention, a first operating parameter of the generator 110 collected by the power analysis device 120 and a second operating parameter of the generator 110 collected by the converter 130 can be obtained, and then the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator 110 are determined according to the first operating parameter, and the internal power factor angle of the generator 110 is determined according to the second operating parameter, and then the d-axis inductance value and the q-axis inductance value of the generator 110 are calculated according to the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude, phase current fundamental frequency and internal power factor angle, and then the d-axis inductance value and the q-axis inductance value of the generator 110 are detected in real time without locking the generator 110 at a specified position.

[0064] In some embodiments, the inductance detection method of the generator may further include the following steps:

[0065] Before calculating the d-axis inductance and q-axis inductance of the generator 110 according to the phase voltage fundamental amplitude, the power factor angle, the back-EMF fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency and the internal power factor angle, the phase resistance of the generator 110 is obtained, and then the d-axis inductance and q-axis inductance are calculated according to the phase voltage fundamental amplitude, the power factor angle, the back-EMF fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency, the internal power factor angle and the phase resistance.

[0066] Specifically, the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude, phase current fundamental frequency, internal power factor angle and phase resistance can be input into a preset d-axis inductance calculation formula to obtain the d-axis inductance value.

[0067] The phase voltage fundamental amplitude, power factor angle, phase current fundamental amplitude, phase current fundamental frequency, internal power factor angle and phase resistance can be input into a preset q-axis inductance calculation formula to obtain the q-axis inductance value.

[0068] As an example, the preset d-axis inductance calculation formula may be:

[0069]

[0070] The preset q-axis inductance calculation formula can be:

[0071]

[0072] Among them, L d Indicates the d-axis inductance, L q represents the q-axis inductance value, E represents the back-EMF fundamental amplitude, U represents the phase voltage fundamental amplitude, δ represents the internal power factor angle, represents the power factor angle, I represents the fundamental amplitude of the phase current, R represents the phase resistance, and ω represents the fundamental frequency of the phase current.

[0073] Among them, formula (1) and formula (2) can be obtained by Figure 6 The vector diagram shown is derived from Figure 6 As shown, the generator 110 determines the positive direction of the voltage and current through the generator convention, NS represents the permanent magnet, the d axis is the direction of the permanent magnet magnetic field, the q axis is the direction perpendicular to the permanent magnet magnetic field at 90 degrees, E represents the fundamental amplitude of the back electromotive force, U represents the fundamental amplitude of the phase voltage, δ represents the internal power factor angle, represents the power factor angle, I represents the fundamental amplitude of the phase current, R represents the phase resistance, and I d represents the d-axis current, I q represents the q-axis current, X d Indicates the d-axis reactance, i.e., L d The product of X and ω, q Indicates the q-axis reactance, i.e., L q The product of L and ω d Indicates the d-axis inductance, L q represents the q-axis inductance value, and ω represents the fundamental frequency of the phase current.

[0074] Combine the following Figure 3 Taking the generator 110 as a MW-class direct-drive permanent magnet synchronous generator as an example, the inductance detection method of the generator provided in the embodiment of the present invention is introduced.

[0075] Step 1: Obtain the phase resistance R of the generator 110 measured by the resistance tester. The power level of the generator 110 may be megawatt level.

[0076] Step 2: When the generator 110 is driven by the motor 170 to rotate to the rated speed V and the converter 130 does not perform the modulation operation, the first back electromotive force Ea1 of the generator 110 collected by the power analyzer 120, and the first rotor position angle θ1 and the second back electromotive force Ea2 of the generator 110 collected by the converter 130 are obtained. The modulation operation can be understood as controlling the generator 110 to generate a specified current, for example, by a space vector pulse width modulation (SVPWM) algorithm.

[0077] Next, the back-EMF fundamental amplitude E of Ea1 is calculated by the PLL algorithm, and the second rotor position angle θ2 is obtained by making the zero points of θ1 coincide with those of Ea2 through zero calibration.

[0078] Step 3: Obtain the phase voltage Ua1 and the first phase current Ia1 of the generator 110 collected by the power analysis device 120 when the converter 130 performs a modulation operation, that is, when the generator 110 is controlled to generate a specified current, and the second phase current Ia2 of the generator 110 collected by the converter 130. The second phase current fundamental phase α of Ia2 is calculated by the PLL algorithm. Ia2 , α Ia2 The internal power factor angle δ is obtained by subtracting it from θ2. The fundamental amplitude U of the phase voltage and the fundamental phase α of the phase voltage of Ua1 are calculated by the PLL algorithm. Ua1 , the fundamental amplitude of the phase current Ia1, the fundamental phase of the first phase current α Ia1 and phase current fundamental frequency ω, α Ua1 With α Ia1 Difference to get the power factor angle

[0079] Step 4: Calculate the d-axis inductance value L using formulas (1) and (2): d , q-axis inductance value L q . Optionally, L d and L q The data in the calculation process can use the average value of the data within 5 seconds, which can reduce the random error value in the result. The results obtained by this method can verify the correctness of the d-axis inductance value and the q-axis inductance value obtained by the magnetic circuit method during the design process of the generator 110.

[0080] Based on the inductance detection method of the generator provided by the embodiment of the present invention, the embodiment of the present invention also provides an inductance detection device of the generator, wherein the inductance detection device can be an inductance detection device or a module in the inductance detection device, and the generator is connected to the power analysis device and the converter respectively. Figure 7 As shown, the inductance detection device 700 may include an acquisition module 710 , a determination module 720 , and a calculation module 730 .

[0081] The acquisition module 710 is used to acquire the first operating parameter of the generator collected by the power analysis device and the second operating parameter of the generator collected by the converter. The first operating parameter includes the phase voltage, the first back electromotive force and the first phase current, and the second operating parameter includes the first rotor position angle, the second back electromotive force and the second phase current.

[0082] The determination module 720 is used to determine the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator according to the first operating parameter.

[0083] The determination module 720 is further configured to determine the internal power factor angle of the generator according to the second operating parameter.

[0084] The calculation module 730 is used to calculate the d-axis inductance and q-axis inductance of the generator according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency and the internal power factor angle.

[0085] In some embodiments, the determination module 720 includes: a first extraction unit, which is used to extract the characteristics of the phase voltage to obtain the phase voltage fundamental amplitude and the phase voltage fundamental phase. The first extraction unit is also used to extract the characteristics of the first back electromotive force to obtain the back electromotive force fundamental amplitude. The first extraction unit is also used to extract the characteristics of the first phase current to obtain the phase current fundamental amplitude, the first phase current fundamental phase and the phase current fundamental frequency.

[0086] The first determining unit is used to use a first difference between a phase voltage fundamental wave phase and a first phase current fundamental wave phase as a power factor angle.

[0087] In some embodiments, the first extraction unit is specifically used to: use the PLL algorithm to extract the features of the phase voltage to obtain the phase voltage fundamental amplitude and the phase voltage fundamental phase. The first extraction unit is specifically used to: use the PLL algorithm to extract the features of the first back electromotive force to obtain the back electromotive force fundamental amplitude. The first extraction unit is specifically used to: use the PLL algorithm to extract the features of the first phase current to obtain the phase current fundamental amplitude, the first phase current fundamental phase and the phase current fundamental frequency.

[0088] In some embodiments, the determination module 720 includes: a zero calibration unit, configured to perform zero calibration on the first rotor position angle using the second back electromotive force to obtain a second rotor position angle after zero calibration.

[0089] The second extraction unit is used to extract features of the second phase current to obtain the fundamental phase of the second phase current.

[0090] The second determining unit is used to use a second difference between the second phase current fundamental phase and the second rotor position angle as the internal power factor angle.

[0091] In some embodiments, the second extraction unit is specifically used to: use a PLL algorithm to extract features of the second phase current to obtain a fundamental phase of the second phase current.

[0092] In some embodiments, the acquisition module 710 is also used to obtain the phase resistance of the generator before calculating the d-axis inductance and q-axis inductance of the generator based on the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude, phase current fundamental frequency and internal power factor angle.

[0093] The calculation module 730 is specifically used to calculate the d-axis inductance and the q-axis inductance according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency, the internal power factor angle and the phase resistance.

[0094] In some embodiments, the calculation module 730 includes: a first calculation unit, which is used to input the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude, phase current fundamental frequency, internal power factor angle and phase resistance into a preset d-axis inductance calculation formula to obtain the d-axis inductance value. A second calculation unit, which is used to input the phase voltage fundamental amplitude, power factor angle, phase current fundamental amplitude, phase current fundamental frequency, internal power factor angle and phase resistance into a preset q-axis inductance calculation formula to obtain the q-axis inductance value.

[0095] Understandably, Figure 7 Each module / unit in the inductance detection device of the generator shown has the function of realizing Figure 5 The functions of each step in the process can achieve the corresponding technical effects, and for the sake of brevity, they will not be described in detail here.

[0096] Figure 8 It is a schematic diagram of the hardware structure of an inductance detection device for a generator provided in an embodiment of the present invention.

[0097] The inductance detection device may include a processor 801 and a memory 802 storing computer program instructions.

[0098] Specifically, the processor 801 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiment of the present invention.

[0099] The memory 802 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 802 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, the memory 802 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 802 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 802 is a non-volatile solid-state memory. In a specific embodiment, the memory 802 includes a read-only memory (ROM). In appropriate cases, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM) or a flash memory or a combination of two or more of these.

[0100] The processor 801 reads and executes computer program instructions stored in the memory 802 to implement any one of the generator inductance detection methods in the above embodiments.

[0101] In one example, the inductance detection device may further include a communication interface 803 and a bus 810. Figure 8 As shown, the processor 801, the memory 802, and the communication interface 803 are connected via a bus 810 and communicate with each other.

[0102] The communication interface 803 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiment of the present invention.

[0103] Bus 810 includes hardware, software or both, and couples the components of the inductance detection device to each other. For example, but not limitation, the bus may include an accelerated graphics port (AGP) or other graphics bus, an enhanced industrial standard architecture (EISA) bus, a front-end bus (FSB), a hypertransport (HT) interconnect, an industrial standard architecture (ISA) bus, an infinite bandwidth interconnect, a low pin count (LPC) bus, a memory bus, a microchannel architecture (MCA) bus, a peripheral component interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a serial advanced technology attachment (SATA) bus, a video electronics standard association local (VLB) bus or other suitable bus or a combination of two or more of these. Where appropriate, bus 810 may include one or more buses. Although the embodiments of the present invention describe and illustrate specific buses, the present invention contemplates any suitable bus or interconnect.

[0104] The inductance detection device can execute the inductance detection method of the generator in the embodiment of the present invention, thereby realizing the inductance detection method of the generator provided by the embodiment of the present invention.

[0105] An embodiment of the present invention further provides a computer-readable storage medium, on which computer program instructions are stored; when the computer program instructions are executed by a processor, the inductance detection method of the generator provided in the embodiment of the present invention is implemented.

[0106] It should be clear that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and for the sake of brevity, no further description is given. The present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of simplicity, a detailed description of the known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0107] The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), appropriate firmware, plug-in, function card, etc. When implemented in software, the elements of the present invention are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or communication link by a data signal carried in a carrier. "Machine-readable medium" may include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, read-only memories (Read-Only Memory, ROM), flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (Radio Frequency, RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0108] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0109] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A method for detecting inductance of a generator, characterized in that: The generator is connected to a power analysis device and a converter respectively, and the method comprises: Acquire a first operating parameter of the generator collected by the power analysis device and a second operating parameter of the generator collected by the converter; wherein the first operating parameter includes a phase voltage, a first back electromotive force and a first phase current, and the second operating parameter includes a first rotor position angle, a second back electromotive force and a second phase current; Determine, according to the first operating parameter, a phase voltage fundamental amplitude, a power factor angle, a back electromotive force fundamental amplitude, a phase current fundamental amplitude, and a phase current fundamental frequency of the generator; determining an internal power factor angle of the generator according to the second operating parameter; Calculating the d-axis inductance and q-axis inductance of the generator according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency and the internal power factor angle; The converter collects the first rotor position angle and the second back electromotive force when the generator is driven by the motor to rotate to a rated speed and the converter does not perform a modulation operation, wherein the modulation operation is used to control the generator to generate a specified current; The converter collects the second phase current when the converter performs the modulation operation; Determining the internal power factor angle of the generator according to the second operating parameter includes: Using the second back electromotive force to calibrate the first rotor position angle to obtain a second rotor position angle after zero calibration; Extracting features of the second-phase current to obtain a fundamental phase of the second-phase current; A second difference between the second phase current fundamental phase and the second rotor position angle is used as the internal power factor angle.

2. The method according to claim 1, characterized in that Determining the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator according to the first operating parameter includes: Extracting features of the phase voltage to obtain the phase voltage fundamental wave amplitude and phase of the phase voltage fundamental wave; Performing feature extraction on the first back-electromotive force to obtain a fundamental wave amplitude of the back-electromotive force; Extracting features of the first phase current to obtain the phase current fundamental amplitude, the first phase current fundamental phase and the phase current fundamental frequency; A first difference between the phase voltage fundamental wave phase and the first phase current fundamental wave phase is used as the power factor angle.

3. The method according to claim 2, characterized in that The feature extraction of the phase voltage to obtain the phase voltage fundamental wave amplitude and the phase voltage fundamental wave phase includes: Extracting features of the phase voltage using a phase-locked loop (PLL) algorithm to obtain a fundamental wave amplitude of the phase voltage and a fundamental wave phase of the phase voltage; The step of extracting features of the first back-electromotive force to obtain the back-electromotive force fundamental amplitude includes: Using a PLL algorithm to extract features of the first back-electromotive force to obtain a fundamental wave amplitude of the back-electromotive force; The feature extraction of the first phase current to obtain the phase current fundamental amplitude, the first phase current fundamental phase and the phase current fundamental frequency includes: The first phase current is characterized by being extracted by using a PLL algorithm to obtain the phase current fundamental wave amplitude, the first phase current fundamental wave phase and the phase current fundamental wave frequency.

4. The method according to claim 1, characterized in that: The step of extracting the feature of the second phase current to obtain the second phase current fundamental phase comprises: The PLL algorithm is used to extract features of the second phase current to obtain the fundamental phase of the second phase current.

5. The method according to any one of claims 1 to 4, characterized in that Before calculating the d-axis inductance and the q-axis inductance of the generator according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency and the internal power factor angle, the method further includes: obtaining a phase resistance of the generator; Wherein, according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency and the internal power factor angle, the d-axis inductance value and the q-axis inductance value of the generator are calculated, including: The d-axis inductance value and the q-axis inductance value are calculated according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency, the internal power factor angle and the phase resistance.

6. The method according to claim 5, characterized in that The calculating of the d-axis inductance value and the q-axis inductance value according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency, the internal power factor angle and the phase resistance comprises: Input the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency, the internal power factor angle and the phase resistance into a preset d-axis inductance calculation formula to obtain the d-axis inductance value; The phase voltage fundamental amplitude, the power factor angle, the phase current fundamental amplitude, the phase current fundamental frequency, the internal power factor angle and the phase resistance are input into a preset q-axis inductance calculation formula to obtain the q-axis inductance value.

7. An inductance detection device for a generator, characterized in that: The generator is connected to the power analysis device and the converter respectively, and the device comprises: An acquisition module, used to acquire a first operating parameter of the generator acquired by the power analysis device and a second operating parameter of the generator acquired by the converter; wherein the first operating parameter includes a phase voltage, a first back electromotive force and a first phase current, and the second operating parameter includes a first rotor position angle, a second back electromotive force and a second phase current; A determination module, configured to determine the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator according to the first operating parameter; The determination module is further used to determine the internal power factor angle of the generator according to the second operating parameter; A calculation module, used for calculating the d-axis inductance and the q-axis inductance of the generator according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency and the internal power factor angle; The converter collects the first rotor position angle and the second back electromotive force when the generator is driven by the motor to rotate to a rated speed and the converter does not perform a modulation operation, wherein the modulation operation is used to control the generator to generate a specified current; The converter collects the second phase current when the converter performs the modulation operation; The determination module includes: a zero calibration unit, configured to perform zero calibration on the first rotor position angle using the second back electromotive force to obtain a second rotor position angle after zero calibration; A second extraction unit, used for extracting features of the second phase current to obtain a fundamental phase of the second phase current; The second determining unit is used to use a second difference between the second phase current fundamental phase and the second rotor position angle as an internal power factor angle.

8. An inductance detection system for a generator, characterized in that: The system comprises: A power analysis device, the power analysis device is connected to the generator, and the power analysis device is used to collect a first operating parameter of the generator; wherein the first operating parameter includes a phase voltage, a first back electromotive force, and a first phase current; A converter, the converter is connected to the generator, and the converter is used to collect a second operating parameter of the generator; wherein the second operating parameter includes a first rotor position angle, a second back electromotive force, and a second phase current; an inductance detection device, the inductance detection device is connected to the power analysis device and the converter respectively, and the inductance detection device is used to obtain the first operating parameter and the second operating parameter; according to the first operating parameter, determine the phase voltage fundamental amplitude, power factor angle, back electromotive force fundamental amplitude, phase current fundamental amplitude and phase current fundamental frequency of the generator; according to the second operating parameter, determine the internal power factor angle of the generator; according to the phase voltage fundamental amplitude, the power factor angle, the back electromotive force fundamental amplitude, the phase current fundamental amplitude, the phase current fundamental frequency and the internal power factor angle, calculate the d-axis inductance value and q-axis inductance value of the generator; Determining the internal power factor angle of the generator according to the second operating parameter includes: Using the second back electromotive force to calibrate the first rotor position angle to obtain a second rotor position angle after zero calibration; Extracting features of the second-phase current to obtain a fundamental phase of the second-phase current; A second difference between the second phase current fundamental phase and the second rotor position angle is used as the internal power factor angle.

9. The system according to claim 8, characterized in that The system further comprises: A rotor position sensor, wherein the rotor position sensor is electrically connected to the converter, and the rotor position sensor is used to collect the first rotor position angle of the rotor and send the first rotor position angle to the converter.

10. The system according to claim 9, characterized in that The system further comprises: An electric-to-optical signal transmitter is connected to the rotor position sensor and the converter respectively, and is used for converting the first rotor position angle into an optical signal, and sending the optical signal to the converter.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the method for detecting the inductance of a generator according to any one of claims 1 to 6 is implemented.

Images