CN114062789A - Method, device and system for detecting inductance of generator and storage medium - Google Patents
Method, device and system for detecting inductance of generator and storage medium Download PDFInfo
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Abstract
The embodiment of the invention provides a method, a device and a system for detecting inductance of a generator and a storage medium. The method comprises the following steps: acquiring a first operating parameter of the generator acquired by the power analysis equipment and a second operating parameter of the generator acquired by the converter; according to the first operation parameter, phase voltage fundamental wave amplitude, power factor angle, back emf fundamental wave amplitude, phase current fundamental wave amplitude and phase current fundamental wave frequency of the generator are determined, according to the second operation parameter, the internal power factor angle of the generator is determined, and according to the phase voltage fundamental wave amplitude, the power factor angle, the back emf fundamental wave amplitude, the phase current fundamental wave frequency and the internal power factor angle, d-axis inductance value and q-axis inductance value of the generator are calculated, so that the inductance value of the generator can be detected in real time in the operation process of the generator.
Description
Technical Field
The invention relates to the technical field of generator detection, in particular to a method, a device and a system for detecting inductance of a generator and a storage medium.
Background
At present, power generators are widely used in various aspects of industrial fields such as wind power generation, thermal power generation, and the like. The generator can achieve the ideal effect only by combining with corresponding converter control, wherein the inductance value of the generator is an important parameter in the converter control, and the inductance value is related to the stability and the operation control precision of the generator.
However, the conventional inductance measurement scheme is to lock the generator at a designated position and then measure the inductance value, and the inductance value can only be detected when the generator is locked.
Disclosure of Invention
The embodiment of the invention provides a method, a device and a system for detecting the inductance of a generator and a storage medium, which can detect the inductance of the generator in real time in the running process of the generator.
In a first aspect, an embodiment of the present invention provides an inductance detection method for a generator, where the generator is connected to a power analysis device and a converter, respectively, and the method includes:
acquiring a first operating parameter of the generator acquired by the power analysis equipment and a second operating parameter of the generator acquired by the converter; wherein the first operating parameters comprise a phase voltage, a first back emf and a first phase current, and the second operating parameters comprise a first rotor position angle, a second back emf and a second phase current;
determining phase voltage fundamental wave amplitude, power factor angle, back emf fundamental wave amplitude, phase current fundamental wave amplitude and phase current fundamental wave frequency of the generator according to the first operation parameter;
determining an internal power factor angle of the generator according to the second operating parameter;
and calculating the d-axis inductance value and the q-axis inductance value of the generator according to the phase voltage fundamental wave amplitude, the power factor angle, the back emf fundamental wave amplitude, the phase current fundamental wave frequency and the internal power factor angle.
In a second aspect, an embodiment of the present invention provides an inductance detecting apparatus for a generator, where the generator is connected to a power analysis device and a converter, respectively, and the apparatus includes:
the acquisition module is used for acquiring a first operating parameter of the generator acquired by the power analysis equipment and a second operating parameter of the generator acquired by the converter; wherein the first operating parameters comprise a phase voltage, a first back emf and a first phase current, and the second operating parameters comprise a first rotor position angle, a second back emf and a second phase current;
the determining module is used for determining phase voltage fundamental wave amplitude, a power factor angle, back electromotive force fundamental wave amplitude, phase current fundamental wave amplitude and phase current fundamental wave frequency of the generator according to the first operation parameter;
the determining module is further used for determining the internal power factor angle of the generator according to the second operation parameter;
and the calculation module is used for calculating the d-axis inductance value and the q-axis inductance value of the generator according to the phase voltage fundamental wave amplitude, the power factor angle, the back electromotive force fundamental wave amplitude, the phase current fundamental wave frequency and the internal power factor angle.
In a third aspect, an embodiment of the present invention provides an inductance detection system for a generator, where the system includes:
the power analysis equipment is connected with the generator and used for acquiring a first operating parameter of the generator; wherein the first operating parameter comprises a phase voltage, a first back emf and a first phase current;
the converter is connected with the generator and used for acquiring a second operating parameter of the generator; wherein the second operating parameter comprises a first rotor position angle, a second back-emf, and a second phase current;
the inductance detection equipment is respectively connected with the power analysis equipment and the converter and is used for acquiring a first operating parameter and a second operating parameter; determining phase voltage fundamental wave amplitude, power factor angle, back emf fundamental wave amplitude, phase current fundamental wave amplitude and phase current fundamental wave frequency of the generator according to the first operation parameter; determining an internal power factor angle of the generator according to the second operating parameter; and calculating the d-axis inductance value and the q-axis inductance value of the generator according to the phase voltage fundamental wave amplitude, the power factor angle, the back emf fundamental wave amplitude, the phase current fundamental wave frequency and the internal power factor angle.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer program instructions are stored on the computer-readable storage medium, and when the computer program instructions are executed by a processor, the method for detecting inductance of a generator according to the first aspect or any of the realizable manners of the first aspect is implemented.
The method, the device, the system and the storage medium for detecting the inductance of the generator provided by the embodiment of the invention can acquire the first operating parameter of the generator acquired by the power analysis equipment and the second operating parameter of the generator acquired by the converter, then determining a phase voltage fundamental amplitude, a power factor angle, a back emf fundamental amplitude, a phase current fundamental amplitude and a phase current fundamental frequency of the generator based on the first operating parameter, and determining an internal power factor angle of the generator based on the second operating parameter, further, according to the amplitude of the phase voltage fundamental wave, the power factor angle, the amplitude of the back emf fundamental wave, the amplitude of the phase current fundamental wave, the frequency of the phase current fundamental wave and the internal power factor angle, the d-axis inductance value and the q-axis inductance value of the generator are calculated, further, the d-axis inductance value and the q-axis inductance value of the generator can be detected in real time without locking the generator at a predetermined position.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an inductance detection system of a generator according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an inductance detection system of another generator according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an inductance detection system of another generator according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electrical-to-optical signal transmitter according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of an inductance detection method of a generator according to an embodiment of the present invention;
FIG. 6 is a vector diagram of the d-axis and q-axis of a generator provided by an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an inductance detection device of a generator according to an embodiment of the present invention;
fig. 8 is a schematic hardware structure diagram of an inductance detection device of a generator according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The inductance values of the generator comprise a d-axis inductance value and a q-axis inductance value, which are important parameters in the control of the converter, wherein the positive maximum direction of the fundamental wave of the sinusoidal magnetic field is defined as the positive direction of a d axis, and the positive direction of a q axis is defined as the direction vertical to the positive maximum direction and lagged by 90 degrees. The d-axis inductance value and the q-axis inductance value are directly related to the decoupling property, the stability and the operation control precision in the control of the generator. For example, whether the generator can stably operate in a high-speed weak magnetic region; whether the motor can fully utilize reluctance torque generated by unequal d-axis inductance and q-axis inductance in a non-weak magnetic region to realize optimal control of torque-current ratio and the like.
The conventional inductance measurement scheme is to lock the generator at a specific position, for example, the d-axis and q-axis positions, and then measure the inductance value, which can only be detected when the generator is locked.
In order to solve the problem of the prior art, embodiments of the present invention provide a method, an apparatus, a system, and a storage medium for detecting inductance of a generator. The method comprises the steps of acquiring first operation parameters of a generator acquired by a power analysis device and second operation parameters of the generator acquired by a converter, determining phase voltage fundamental wave amplitude, a power factor angle, back-emf fundamental wave amplitude, phase current fundamental wave amplitude and phase current fundamental wave frequency of the generator according to the first operation parameters, determining internal power factor angle of the generator according to the second operation parameters, calculating d-axis inductance value and q-axis inductance value of the generator according to the phase voltage fundamental wave amplitude, the power factor angle, the back-emf fundamental wave amplitude, the phase current fundamental wave frequency and the internal power factor angle, locking the generator at a specified position, and detecting d-axis inductance value and q-axis inductance value of the generator in real time.
First, the inductance detection system of the generator according to the embodiment of the present invention will be described.
Fig. 1 is a schematic structural diagram of an inductance detection system of a generator according to an embodiment of the present invention, and as shown in fig. 1, the inductance detection system is used for detecting an inductance of a generator 110, and may include a power analysis device 120, a current transformer 130, and an inductance detection device 140.
Therein, the power analysis device 120 may be connected to the generator 110 for acquiring a first operating parameter of the generator 110. The power analyzing 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 in a wind turbine generator set. The first operating parameters include a phase voltage, a first back emf and a first phase current.
The converter 130 may be coupled to the generator 110 for acquiring a second operating parameter of the generator 110. Wherein the second operating parameter comprises the first rotor position angle, the second back-emf and the second phase current.
The inductance detection device 140 may be connected to the power analysis device 120 and the converter 130, respectively, for obtaining a first operating parameter and a second operating parameter, determining a phase voltage fundamental amplitude, a power factor angle, a back-emf fundamental amplitude, a phase current fundamental amplitude and a phase current fundamental frequency of the generator according to the first operating parameter, determining an internal power factor angle of the generator according to the second operating parameter, and then calculating a d-axis inductance value and a q-axis inductance value of the generator according to the phase voltage fundamental amplitude, the power factor angle, the back-emf fundamental amplitude, the phase current fundamental frequency and the internal power factor angle.
In some embodiments, referring to fig. 2, the inductance detection system may further include a rotor position sensor 150, such as an encoder. The generator 110 may include a rotor (not shown) therein, and the generator 110 may further include an output 111 (shown in fig. 3).
Therein, the rotor position sensor 150 may be electrically connected to the converter 130, and configured to acquire a first rotor position angle of the rotor and transmit the first rotor position angle to the converter 130. Alternatively, when the rotor position sensor 150 is a contact encoder, the rotor position sensor 150 is mechanically coupled to the rotor. When the rotor position sensor 150 is a non-contact encoder, it may be mounted in a non-contact manner with the rotor.
The output end 111 is an electric energy output end of the generator 110, and may be connected to the power analysis device 120 and the converter 130, respectively, for outputting the electric energy generated by the generator 110. The power analysis device 120 may calculate the first operating parameter from the output electrical energy. The converter 130 may calculate the second operation parameter by the output power.
Since the rotor position sensor 150 is located at a long distance from the converter 130 and the electrical signal is susceptible to electromagnetic interference, the first rotor position angle may be transmitted to the converter 130 by converting the electrical signal into the optical signal, and specifically, referring to fig. 2, the inductance detecting system may further include an electrical-to-optical signal transmitter 160, where the electrical-to-optical signal transmitter 160 is connected to the rotor position sensor 150 and the converter 130, respectively, for converting the first rotor position angle into the optical signal and transmitting the optical signal to the converter 130.
In an embodiment of the present invention, the first operating parameter of the generator 110 collected by the power analyzing device 120 and the second operating parameter of the generator 110 collected by the converter 130 can be obtained, the inductance detection device 140 then determines the phase voltage fundamental amplitude, the power factor angle, the back emf fundamental amplitude, the phase current fundamental amplitude, and the phase current fundamental frequency of the generator 110 based on the first operating parameters, and determines the internal power factor angle of the generator 110 based on the second operating parameters, further, a d-axis inductance value and a q-axis inductance value of the generator 110 are calculated based on the phase voltage fundamental wave amplitude, the power factor angle, the back emf fundamental wave amplitude, the phase current fundamental wave frequency, and the internal power factor angle, further, the d-axis inductance value and the q-axis inductance value of the generator 110 can be detected in real time without locking the generator 110 at a predetermined position.
The embodiment of the present invention further provides a schematic structural diagram of another inductance detecting system of a generator, as shown in fig. 3, compared with fig. 2, the inductance detecting system may further include a motor 170 and a rotating shaft 180.
The rotor is mechanically coupled to an output shaft (not shown) of the motor 170 via a rotating shaft 180. In one example, the shaft 180 may be a shaft of the generator 110, a shaft of the motor 170, or a shaft separate from the generator 110 and the motor 170. In one example, the rotor position sensor 150 may be mechanically coupled to the rotating shaft 180 or may be mounted in a non-contact manner with the rotating shaft 180. The rotor position sensor 150 may be used to acquire the position angle of the rotating shaft 180, and 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.
By adopting a motor-to-motor mode and dragging the rotor to move by using the motor 170, the working state of the generator can be simulated, so that the d-axis inductance value and the q-axis inductance value of the generator can be flexibly calculated.
Fig. 4 is a schematic structural diagram of an electrical-to-optical signal transmitter according to an embodiment of the present invention, and as shown in fig. 4, the electrical-to-optical signal transmitter 160 may include a data transceiver 161, an electrical-to-optical adapter plate 162, and an optical fiber transceiver 163. The electrical-to-optical adapter plate 162 may be configured to provide a conversion interface for the data transceiver 161 and the optical fiber transceiver 163, the interface signal of the rotor position sensor 150 may be an RS485 signal, the data transceiver 161 may be an RS485 transceiver, the data transceiver 161 is configured to convert the differentially transmitted RS485 signal into a single-wire serial signal, the optical fiber transceiver 163 is configured to convert the single-wire serial signal into an optical signal, and the optical signal is transmitted to the converter 130 in a serial communication manner.
In some embodiments, the inductance detection system may further include a resistance test device, such as a resistance tester, for collecting phase resistances of the generator 110 before calculating d-axis and q-axis inductance values of the generator based on the phase voltage fundamental amplitude, the power factor angle, the back emf 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. Further, the inductance detecting device 140 may 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 emf fundamental amplitude, the phase current fundamental frequency, the internal power factor angle, and the phase resistance, thereby improving the accuracy of calculation of the d-axis inductance value and the q-axis inductance value.
The method for detecting the inductance of the generator according to the embodiment of the invention will be described below. The method for detecting the inductance of the generator may be performed by the inductance detecting device 140 shown in fig. 1 or fig. 2 or fig. 3 or a functional module in the inductance detecting device 140.
Fig. 5 is a schematic flowchart of an inductance detection method of a generator according to an embodiment of the present invention, and as shown in fig. 5, the inductance detection method of the generator may include S510 to S540. Please refer to fig. 1 to fig. 3.
S510, 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 are obtained.
The generator 110 is connected to the power analyzing device 120 and the converter 130, respectively. The first operating parameters include a phase voltage, a first back emf and a first phase current, and the second operating parameters include a first rotor position angle, a second back emf and a second phase current.
In some embodiments, a plurality of first operating parameters and a plurality of second operating parameters may be obtained over a specified period of time, e.g., 5 seconds, and a first average of the plurality of first operating parameters and a second average of the plurality of second operating parameters may be calculated; the first average value is used as a first operation parameter, the second average value is used as a second operation parameter to participate in calculation, specifically, the average values can be respectively calculated for the phase voltage, the first back electromotive force and the first phase current, and the average values can be respectively calculated for the first rotor position angle, the second back electromotive force and the second phase current, so that the random error of calculation can be reduced.
S520, determining phase voltage fundamental wave amplitude, power factor angle, back electromotive force fundamental wave amplitude, phase current fundamental wave amplitude and phase current fundamental wave frequency of the generator 110 according to the first operation parameters.
In some embodiments, the phase voltages may be characterized to obtain a phase voltage fundamental amplitude and a phase voltage fundamental phase, the first back emf may be characterized to obtain a back emf fundamental amplitude, the first phase current may be characterized to obtain a phase current fundamental amplitude, a first phase current fundamental phase, and a phase current fundamental frequency, and the phase voltage fundamental phase and the first phase current fundamental phase may be subtracted to obtain a first difference between the phase voltage fundamental phase and the first phase current fundamental phase as the power factor angle.
As an example, a Phase Locked Loop (PLL) algorithm may be used to perform feature extraction on the Phase voltage to obtain a Phase voltage fundamental amplitude and a Phase voltage fundamental Phase, a PLL algorithm may be used to perform feature extraction on the first counter potential to obtain a counter potential fundamental amplitude, and a PLL algorithm may be used to perform feature extraction on the first Phase current to obtain a Phase current fundamental amplitude, a first Phase current fundamental Phase, and a Phase current fundamental frequency. For example, the PLL algorithm is used to perform feature extraction on the first phase current, which may be understood as that the first phase current is calculated through the calculation steps of rotating the abc coordinate system by the α β coordinate system, rotating the α β coordinate system by the dq coordinate system, performing PI adjustment, integrating, and the like, so as to obtain the phase current fundamental wave amplitude, the first phase current fundamental wave phase, and the phase current fundamental wave frequency of the first phase current.
As another example, the phase voltage may be characterized by a filter extraction algorithm to obtain a phase voltage fundamental amplitude and a phase voltage fundamental phase, the first back emf may be characterized by a filter extraction algorithm to obtain a back emf fundamental amplitude, and the first phase current may be characterized by a filter extraction algorithm to obtain a phase current fundamental amplitude, a first phase current fundamental phase, and a phase current fundamental frequency. For example, the feature extraction is performed on the first phase current by using a filtering extraction algorithm, which may be understood as determining three-phase current coordinates of the first phase current in an abc coordinate system, then converting the three-phase current coordinates into two-phase current coordinates in an α β coordinate system, obtaining a fundamental wave corresponding to the first phase current through low-pass filtering, determining a phase current fundamental wave amplitude and a phase current fundamental wave frequency of the first phase current according to the obtained fundamental wave, converting the two-phase current coordinates into synchronous current coordinates in a dq coordinate system, and performing arc tangent calculation according to the synchronous current coordinates to obtain a first phase current fundamental wave phase of the first phase current.
S530, determining the internal power factor angle of the generator 110 according to the second operation parameter.
In some embodiments, the first rotor position angle may be zeroed using the second back-emf, resulting in a second rotor position angle that is zeroed. Specifically, the back emf fundamental wave phase of the second back emf may be calculated, and the zero point of the first rotor position angle may be coincident with the zero point of the back emf fundamental wave phase to obtain the second rotor position angle. The measurement error of the first rotor position angle can be eliminated by zero calibration, and the accuracy of the rotor position angle is improved, so that the d-axis inductance value and the q-axis inductance value can be accurately calculated.
Meanwhile, the second phase current may be subjected to feature extraction to obtain a second phase current fundamental phase. As one example, the second phase current may be characterized using a PLL algorithm to obtain a second phase current fundamental phase. As another example, the second phase current may be characterized using a filtered extraction algorithm to obtain a second phase current fundamental phase. The second phase current fundamental phase and the second rotor position angle are then differenced, and a second difference between the second phase current fundamental phase and the second rotor position angle is taken as the internal power factor angle.
S540, calculating the d-axis inductance value and the q-axis inductance value of the generator 110 according to the phase voltage fundamental wave amplitude, the power factor angle, the back emf fundamental wave amplitude, the phase current fundamental wave frequency, and the internal power factor angle.
In the embodiment of the present invention, the first operation parameter of the generator 110 collected by the power analysis device 120 and the second operation parameter of the generator 110 collected by the converter 130 can be obtained, then the phase voltage fundamental amplitude, the power factor angle, the back emf fundamental amplitude, the phase current fundamental amplitude and the phase current fundamental frequency of the generator 110 are determined according to the first operation parameter, the internal power factor angle of the generator 110 is determined according to the second operation 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, the power factor angle, the back emf fundamental amplitude, the phase current fundamental frequency and the internal power factor angle, so that the d-axis inductance value and the q-axis inductance value of the generator 110 can be detected in real time without locking the generator 110 at a designated position.
In some embodiments, the method for detecting the inductance of the generator may further include the steps of:
before calculating the d-axis inductance value and the q-axis inductance value of the generator 110 according to the phase voltage fundamental amplitude, the power factor angle, the back emf 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 value and the q-axis inductance value are calculated according to the phase voltage fundamental amplitude, the power factor angle, the back emf fundamental amplitude, the phase current fundamental frequency, the internal power factor angle, and the phase resistance.
Specifically, the phase voltage fundamental wave amplitude, the power factor angle, the back emf fundamental wave amplitude, the phase current fundamental wave frequency, the internal power factor angle, and the phase resistance may be input into a preset d-axis inductance calculation formula to obtain the d-axis inductance value.
The phase voltage fundamental wave amplitude, the power factor angle, the phase current fundamental wave amplitude, the phase current fundamental wave frequency, the internal power factor angle and the phase resistance can be input into a preset q-axis inductance calculation formula to obtain a q-axis inductance value.
As an example, the preset d-axis inductance calculation formula may be:
the preset q-axis inductance calculation formula may be:
wherein L isdRepresents d-axis inductance value, LqRepresenting the q-axis inductance value, E representing the back emf fundamental amplitude, U representing the phase voltage fundamental amplitude, δ representing the internal power factor angle,
the angle of the power factor is shown, I represents the amplitude of the fundamental wave of the phase current, R represents the phase resistance, and omega represents the frequency of the fundamental wave of the phase current.
Wherein, the equations (1) and (2) can be derived from the vector diagram shown in fig. 6, as shown in fig. 6, the generator 110 determines the positive direction of the voltage and current by the generator convention, NS represents the permanent magnet, and d axis isThe direction of the magnetic field of the permanent magnet, the q axis is the direction which is vertical to the magnetic field of the permanent magnet by 90 degrees, E represents the amplitude of a back electromotive force fundamental wave, U represents the amplitude of a phase voltage fundamental wave, delta represents the angle of an internal power factor,
representing power factor angle, I representing phase current fundamental amplitude, R representing phase resistance, IdDenotes d-axis current, IqRepresenting the q-axis current, XdRepresents d-axis reactance, i.e., LdProduct of X with ωqRepresents q-axis reactance, i.e. LqProduct of ω, LdRepresents d-axis inductance value, LqQ-axis inductance value is shown, and ω is phase current fundamental frequency.
Referring to fig. 3, an example of a generator 110 as a MW-class direct-drive permanent magnet synchronous generator is described below, where the method for detecting inductance of a generator according to an embodiment of the present invention is described.
Step 1, obtaining a phase resistance R of the generator 110 measured by the resistance tester. Wherein the power level of the generator 110 may be in megawatts.
And 2, acquiring a first counter potential Ea1 of the generator 110 collected by the power analyzer 120, a first rotor position angle theta 1 collected by the converter 130 and a second counter potential Ea2 of the generator 110 when the generator 110 is dragged to rotate to the rated rotating speed V by the motor 170 and the converter 130 does not perform modulation operation. The Modulation operation may be understood as controlling the generator 110 to generate a specified current, and may be modulated by a Space Vector Pulse Width Modulation (SVPWM) algorithm, for example.
Then, the counter electromotive force fundamental wave amplitude E of Ea1 is calculated by a PLL algorithm, and a second rotor position angle theta 2 is obtained by correcting zero to enable theta 1 to coincide with the zero point of Ea 2.
And step 3, acquiring 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 the modulation operation, namely, the generator 110 is controlled to generate the specified current, and acquiring the second phase current Ia2 of the generator 110 collected by the converter 130. The second phase current fundamental wave phase alpha of Ia2 is calculated by a PLL algorithmIa2，αIa2The difference with theta 2 yields the internal power factor angle delta. Calculating the phase voltage fundamental wave amplitude U and the phase voltage fundamental wave phase alpha of Ua1 by a PLL algorithmUa1Phase current fundamental wave amplitude I of Ia1 and first phase current fundamental wave phase alphaIa1Sum phase current fundamental frequency ω, αUa1And alphaIa1Differential power factor angle
Step 4, calculating to obtain d-axis inductance L through formulas (1) and (2)dQ-axis inductance Lq. Alternatively, LdAnd LqThe data in the calculation process can be the average value of the data within 5 seconds, and random error values in the result can be reduced. 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 in the design process of the generator 110.
Based on the inductance detection method of the generator provided by the embodiment of the invention, the embodiment of the invention also provides an inductance detection device of the generator, wherein the inductance detection device can be inductance detection equipment or a module in the inductance detection equipment, and the generator is respectively connected with the power analysis equipment and the converter. As shown in fig. 7, the inductance detection apparatus 700 may include an obtaining module 710, a determining module 720, and a calculating module 730.
The obtaining module 710 is configured to obtain 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 parameters comprise a phase voltage, a first back emf and a first phase current, and the second operating parameters comprise a first rotor position angle, a second back emf and a second phase current.
The determining module 720 is configured to determine a phase voltage fundamental amplitude, a power factor angle, a back emf fundamental amplitude, a phase current fundamental amplitude, and a phase current fundamental frequency of the generator according to the first operating parameter.
The determining module 720 is further configured to determine an internal power factor angle of the generator according to the second operating parameter.
And the calculating module 730 is configured to calculate a d-axis inductance value and a q-axis inductance value of the generator according to the phase voltage fundamental wave amplitude, the power factor angle, the back emf fundamental wave amplitude, the phase current fundamental wave frequency and the internal power factor angle.
In some embodiments, the determining module 720 includes: and the first extraction unit is used for carrying out characteristic extraction on the phase voltage to obtain a phase voltage fundamental wave amplitude and a phase voltage fundamental wave phase. The first extraction unit is further used for carrying out feature extraction on the first counter electromotive force to obtain the counter electromotive force fundamental wave amplitude. The first extraction unit is further configured to perform feature extraction on the first phase current to obtain a phase current fundamental wave amplitude, a first phase current fundamental wave phase, and a phase current fundamental wave frequency.
A first determination unit configured to take a first difference between the phase voltage fundamental wave phase and the first phase current fundamental wave phase as a power factor angle.
In some embodiments, the first extraction unit is specifically configured to: and (4) performing characteristic extraction on the phase voltage by using a PLL (phase locked loop) algorithm to obtain a phase voltage fundamental wave amplitude and a phase voltage fundamental wave phase. The first extraction unit is specifically configured to: and performing feature extraction on the first counter electromotive force by utilizing a PLL algorithm to obtain the counter electromotive force fundamental wave amplitude. The first extraction unit is specifically configured to: and performing feature extraction on the first phase current by utilizing a PLL algorithm to obtain a phase current fundamental wave amplitude, a first phase current fundamental wave phase and a phase current fundamental wave frequency.
In some embodiments, the determining module 720 includes: and the zero calibration unit is used for calibrating the first rotor position angle by using the second back electromotive force to obtain a second rotor position angle after zero calibration.
And the second extraction unit is used for extracting the characteristics of the second phase current to obtain the second phase current fundamental wave phase.
A second determination unit for taking a second difference between the second phase current fundamental phase and the second rotor position angle as the internal power factor angle.
In some embodiments, the second extraction unit is specifically configured to: and performing feature extraction on the second phase current by utilizing a PLL algorithm to obtain the second phase current fundamental wave phase.
In some embodiments, the obtaining module 710 is further configured to obtain the phase resistance of the generator 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 emf fundamental amplitude, the phase current fundamental frequency, and the internal power factor angle.
The calculating module 730 is specifically configured to: and calculating a d-axis inductance value and a q-axis inductance value according to the phase voltage fundamental wave amplitude, the power factor angle, the back emf fundamental wave amplitude, the phase current fundamental wave frequency, the internal power factor angle and the phase resistance.
In some embodiments, the calculation module 730 includes: the first calculation unit is used for inputting the phase voltage fundamental wave amplitude, the power factor angle, the back emf fundamental wave amplitude, the phase current fundamental wave frequency, the internal power factor angle and the phase resistance into a preset d-axis inductance calculation formula to obtain a d-axis inductance value. And the second calculation unit is used for inputting the phase voltage fundamental wave amplitude, the power factor angle, the phase current fundamental wave amplitude, the phase current fundamental wave frequency, the internal power factor angle and the phase resistance into a preset q-axis inductance calculation formula to obtain a q-axis inductance value.
It can be understood that each module/unit in the inductance detecting device of the generator shown in fig. 7 has a function of implementing each step in fig. 5, and can achieve the corresponding technical effect, and for brevity, no further description is provided herein.
Fig. 8 is a schematic hardware structure diagram of an inductance detection device of a generator according to an embodiment of the present invention.
The inductance detection device may include a processor 801 and a memory 802 storing computer program instructions.
Specifically, the processor 801 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured as one or more Integrated circuits implementing embodiments of the present invention.
The processor 801 reads and executes computer program instructions stored in the memory 802 to implement the inductance detection method of the generator in any of the above embodiments.
In one example, the inductance detection device may also include a communication interface 803 and a bus 810. As shown in fig. 8, the processor 801, the memory 802, and the communication interface 803 are connected via a bus 810 to complete communication therebetween.
The communication interface 803 is mainly used for implementing communication between modules, apparatuses, units and/or devices in the embodiments of the present invention.
The inductance detection device can execute the inductance detection method of the generator in the embodiment of the invention, thereby realizing the inductance detection method of the generator provided by the embodiment of the invention.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium has computer program instructions stored thereon; the computer program instructions, when executed by a processor, implement the method for detecting the inductance of the generator provided by the embodiment of the invention.
It should be clear that each embodiment in this specification is described in a progressive manner, and the same or similar parts among the embodiments may be referred to each other, and for brevity, the description is omitted. The invention is not limited to the specific configurations and processes described above and shown in the figures. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic Circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of machine-readable media include electronic circuits, semiconductor Memory devices, Read-Only memories (ROMs), flash memories, erasable ROMs (eroms), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this patent 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-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (12)
1. A method for detecting inductance of a generator, wherein the generator is connected to a power analysis device and a converter, respectively, the method comprising:
acquiring 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 parameters comprise a phase voltage, a first back emf and a first phase current, and the second operating parameters comprise a first rotor position angle, a second back emf and a second phase current;
determining phase voltage fundamental wave amplitude, power factor angle, back emf fundamental wave amplitude, phase current fundamental wave amplitude and phase current fundamental wave frequency of the generator according to the first operating parameter;
determining an internal power factor angle of the generator according to the second operating parameter;
and calculating a d-axis inductance value and a q-axis inductance value of the generator according to the phase voltage fundamental wave amplitude, the power factor angle, the back emf fundamental wave amplitude, the phase current fundamental wave frequency and the internal power factor angle.
2. The method of claim 1, wherein determining a phase voltage fundamental magnitude, a power factor angle, a back emf fundamental magnitude, a phase current fundamental magnitude, and a phase current fundamental frequency of the generator based on the first operating parameter comprises:
performing feature extraction on the phase voltage to obtain a phase voltage fundamental wave amplitude and a phase voltage fundamental wave phase;
performing feature extraction on the first counter electromotive force to obtain the counter electromotive force fundamental wave amplitude;
performing feature extraction on the first phase current to obtain the phase current fundamental wave amplitude, the first phase current fundamental wave phase and the phase current fundamental wave frequency;
and taking a first difference value between the phase voltage fundamental phase and the first phase current fundamental phase as the power factor angle.
3. The method of claim 2, wherein the characterizing the phase voltages to obtain the phase voltage fundamental amplitude and phase voltage fundamental phase comprises:
performing feature extraction on the phase voltage by using a phase-locked loop (PLL) algorithm to obtain the phase voltage fundamental wave amplitude and the phase voltage fundamental wave phase;
the extracting the features of the first back emf to obtain the back emf fundamental wave amplitude includes:
performing feature extraction on the first counter electromotive force by utilizing a PLL algorithm to obtain the counter electromotive force fundamental wave amplitude;
the performing feature extraction on the first phase current to obtain the phase current fundamental wave amplitude, the first phase current fundamental wave phase and the phase current fundamental wave frequency includes:
and performing feature extraction on the first phase current by utilizing a PLL algorithm to obtain the amplitude of the phase current fundamental wave, the phase of the first phase current fundamental wave and the frequency of the phase current fundamental wave.
4. The method of claim 1, wherein determining an internal power factor angle of the generator based on the second operating parameter comprises:
utilizing the second counter electromotive force to zero the first rotor position angle to obtain a second rotor position angle after zero calibration;
performing characteristic extraction on the second-phase current to obtain a second-phase current fundamental phase;
and taking a second difference between the second phase current fundamental phase and the second rotor position angle as the internal power factor angle.
5. The method of claim 4, wherein the characterizing the second phase current to obtain a second phase current fundamental phase comprises:
and performing feature extraction on the second phase current by utilizing a PLL algorithm to obtain the second phase current fundamental wave phase.
6. The method of any of claims 1-5, further comprising, prior to calculating d-axis and q-axis inductance values of the generator from the phase voltage fundamental amplitude, the power factor angle, the back emf fundamental amplitude, the phase current fundamental frequency, and the internal power factor angle:
acquiring phase resistance of the generator;
wherein calculating a d-axis inductance value and a q-axis inductance value of the generator according to the phase voltage fundamental amplitude, the power factor angle, the back emf fundamental amplitude, the phase current fundamental frequency, and the internal power factor angle comprises:
calculating the d-axis inductance value and the q-axis inductance value according to the phase voltage fundamental amplitude, the power factor angle, the back emf fundamental amplitude, the phase current fundamental frequency, the internal power factor angle, and the phase resistance.
7. The method of claim 6, wherein the calculating the d-axis inductance value and the q-axis inductance value from the phase voltage fundamental amplitude, the power factor angle, the back emf fundamental amplitude, the phase current fundamental frequency, the internal power factor angle, and the phase resistance comprises:
inputting the phase voltage fundamental wave amplitude, the power factor angle, the back emf fundamental wave amplitude, the phase current fundamental wave frequency, the internal power factor angle and the phase resistance into a preset d-axis inductance calculation formula to obtain a d-axis inductance value;
and inputting the phase voltage fundamental wave amplitude, the power factor angle, the phase current fundamental wave amplitude, the phase current fundamental wave frequency, the internal power factor angle and the phase resistor into a preset q-axis inductance calculation formula to obtain the q-axis inductance value.
8. An inductance detecting device of a generator, wherein the generator is respectively connected with a power analyzing device and a converter, the device comprising:
the acquisition module is used for acquiring a first operating parameter of the generator acquired by the power analysis equipment and a second operating parameter of the generator acquired by the converter; wherein the first operating parameters comprise a phase voltage, a first back emf and a first phase current, and the second operating parameters comprise a first rotor position angle, a second back emf and a second phase current;
the determining module is used for determining phase voltage fundamental wave amplitude, power factor angle, back electromotive force fundamental wave amplitude, phase current fundamental wave amplitude and phase current fundamental wave frequency of the generator according to the first operating parameter;
the determining module is further used for determining an internal power factor angle of the generator according to the second operating parameter;
and the calculation module is used for calculating a d-axis inductance value and a q-axis inductance value of the generator according to the phase voltage fundamental wave amplitude, the power factor angle, the back electromotive force fundamental wave amplitude, the phase current fundamental wave frequency and the internal power factor angle.
9. An inductance detection system of a generator, the system comprising:
the power analysis equipment is connected with the generator and used for acquiring a first operating parameter of the generator; wherein the first operating parameters include a phase voltage, a first back emf, and a first phase current;
the converter is connected with the generator and is used for acquiring a second operating parameter of the generator; wherein the second operating parameter comprises a first rotor position angle, a second back-emf, and a second phase current;
the inductance detection equipment is respectively connected with the power analysis equipment and the converter and is used for acquiring the first operating parameter and the second operating parameter; determining phase voltage fundamental wave amplitude, power factor angle, back emf fundamental wave amplitude, phase current fundamental wave amplitude and phase current fundamental wave frequency of the generator according to the first operating parameter; determining an internal power factor angle of the generator according to the second operating parameter; and calculating a d-axis inductance value and a q-axis inductance value of the generator according to the phase voltage fundamental wave amplitude, the power factor angle, the back emf fundamental wave amplitude, the phase current fundamental wave frequency and the internal power factor angle.
10. The system of claim 9, further comprising:
the rotor position sensor is electrically connected with the converter and used for acquiring the first rotor position angle of the rotor and sending the first rotor position angle to the converter.
11. The system of claim 10, further comprising:
and the electric-to-optical signal transmitter is respectively connected with the rotor position sensor and the converter and is used for converting the first rotor position angle into an optical signal and sending the optical signal to the converter.
12. A computer-readable storage medium, having computer program instructions stored thereon, which, when executed by a processor, implement the method of detecting the inductance of a generator according to any one of claims 1-7.
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