CN109861612B - Rotor position angle detection method and device of wind generating set - Google Patents
Rotor position angle detection method and device of wind generating set Download PDFInfo
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Abstract
The invention discloses a rotor position angle detection method and device of a wind generating set. The rotor position angle detection method of the wind generating set comprises the following steps: acquiring motor side current and motor side voltage of a converter of the wind generating set; calculating a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the motor side current and the motor side voltage; and calculating the rotor position angle of the wind generating set by using the current vector and the voltage vector. According to the embodiment of the invention, the detection precision of the rotor position angle of the wind generating set can be improved, and the control error of the wind generating set is reduced.
Description
Technical Field
The invention belongs to the technical field of wind driven generators, and particularly relates to a method and a device for detecting a rotor position angle of a wind driven generator set.
Background
When controlling, for example, a synchronous generator, it is necessary to acquire a rotor position angle of the synchronous generator in order to perform a decoupling control of the synchronous generator.
In general, the main principle of the detection method for measuring the rotor position angle using a position sensorless is as follows: the generator current of the synchronous generator is measured, and the rotor position angle of the synchronous generator is estimated by using the generator current and a generator mathematical model.
However, when the rotor position angle of the synchronous generator is estimated by the above detection method, the accuracy of the estimation result depends on the accuracy of the generator parameters. When the generator parameters drift, the deviation between the estimation result and the actual value of the rotor position angle occurs, thereby bringing about control errors of the synchronous generator.
Disclosure of Invention
In view of one or more of the above problems, embodiments of the present invention provide a method and an apparatus for detecting a rotor position angle of a wind turbine generator system.
In one aspect, an embodiment of the present invention provides a method for detecting a rotor position angle of a wind turbine generator system, including:
acquiring motor side current and motor side voltage of a converter of the wind generating set;
calculating a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the motor side current and the motor side voltage;
and calculating the rotor position angle of the wind generating set by using the current vector and the voltage vector.
Further, calculating a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the motor side current and the motor side voltage includes:
determining a voltage phase angle corresponding to the motor side voltage;
and calculating a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the voltage phase angle, the motor side current and the motor side voltage.
Further, before determining a voltage phase angle corresponding to the motor side voltage, the method further includes:
filtering the motor side voltage, and selecting the motor side voltage with preset frequency; or/and the light source is arranged in the light path,
after the voltage phase angle corresponding to the motor side voltage is determined, the method further comprises the following steps:
acquiring a phase shift amount of the filtered motor side voltage;
and performing phase shift compensation on the voltage phase angle according to the phase shift quantity.
Further, calculating a rotor position angle of the wind turbine generator set using the current vector and the voltage vector includes:
calculating an internal potential phase angle of the wind generating set according to the current vector and the voltage vector;
acquiring an angle difference value between a flux linkage vector angle corresponding to a flux linkage vector of the wind generating set and the internal potential phase angle;
and determining the rotor position angle according to the internal potential phase angle and the angle difference value.
Further, calculating an internal potential phase angle of the wind park from the current vector and the voltage vector comprises:
determining a voltage angular frequency corresponding to the motor side voltage;
calculating an internal potential vector of the wind generating set by using a generator potential equation according to the current vector, the voltage vector and the voltage angular frequency;
determining the internal potential phase angle from the internal potential vector.
Further, a motor current breaker is connected between a current transformer of the wind generating set and the generator, and the motor side voltage is the voltage between the motor current breaker and the generator or the voltage between the motor current breaker and the current transformer.
On the other hand, an embodiment of the present invention provides a rotor position angle detection apparatus for a wind turbine generator system, including:
the current acquisition module is used for acquiring motor side current of a current transformer for detecting a rotor position angle of the wind generating set;
the voltage acquisition module is used for acquiring the motor side voltage of the converter for detecting the rotor position angle of the wind generating set;
the vector calculation module is respectively connected with the current acquisition module and the voltage acquisition module and is used for calculating a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the motor side current and the motor side voltage;
and the position calculation module is connected with the vector calculation module and is used for calculating the rotor position angle detected by the rotor position angle of the wind generating set by utilizing the current vector and the voltage vector.
Further, still include:
the phase-locked loop is respectively connected with the voltage acquisition module and the vector calculation module and used for determining a voltage phase angle corresponding to the motor side voltage and sending the voltage phase angle to the vector calculation module, so that the vector calculation module calculates a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the voltage phase angle, the motor side current and the motor side voltage.
Further, between the phase-locked loop and the voltage acquisition module, the method further includes:
the low-pass filter is connected with the voltage acquisition module and is used for filtering high-frequency interference signals of the motor side voltage;
and the band-pass filter is connected with the low-pass filter and the phase-locked loop and is used for selecting the motor side voltage with the preset frequency.
Further, between the phase-locked loop and the vector calculation module, the method further includes:
and the phase shift compensator is used for acquiring the phase shift quantity of the filtered motor side voltage and performing phase shift compensation on the voltage phase angle according to the phase shift quantity.
Further, the phase-locked loop is further connected with the position calculation module, wherein the phase-locked loop is further used for determining a voltage angular frequency corresponding to the voltage on the motor side and sending the voltage angular frequency to the position calculation module, the position calculation module calculates an internal potential vector of the wind generating set by using a generator potential equation according to the current vector, the voltage vector and the voltage angular frequency, and then determines the internal potential phase angle according to the internal potential vector.
The method and the device for detecting the rotor position angle of the wind generating set can calculate the current vector and the voltage vector of the motor side of the converter based on the motor side current and the motor side voltage of the converter of the wind generating set, then calculate the rotor position angle of the wind generating set by using the current vector and the voltage vector, directly estimate the rotor position angle of the wind generating set by detecting the motor side current and the motor side voltage of the converter, do not need to estimate by using a mathematical model of the wind generating set and do not depend on the parameters of the wind generating set, therefore, even if the parameters of the wind generating set drift, the calculated rotor position angle can not deviate, the detection precision of the rotor position angle of the wind generating set is improved, and the control error of the wind generating set is reduced.
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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 flow chart of a method for detecting a rotor position angle of a wind turbine generator system according to an embodiment of the invention;
FIG. 2 is a schematic flow chart diagram illustrating a specific method of one embodiment of S120 of FIG. 1;
FIG. 3 is a schematic flow chart of a specific method of another embodiment of S120 of FIG. 1;
FIG. 4 is a flowchart illustrating a specific method of one embodiment of S130 of FIG. 1;
FIG. 5 is a flowchart illustrating a detailed method of one embodiment of S131 in FIG. 4;
FIG. 6 is a generator vector diagram of one embodiment of the present invention;
fig. 7 is a schematic structural diagram of a rotor position angle detection device of a wind turbine generator system according to an embodiment of the invention;
fig. 8 is a schematic structural diagram of an example of the rotor position angle detection device and the wind turbine generator set according to the 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 specific 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.
In order to solve the problems in the prior art, the embodiment of the invention provides a method and a device for measuring a rotor position angle and a motor. The following first describes a rotor position angle measurement method provided by an embodiment of the present invention.
Fig. 1 shows a schematic flow chart of a rotor position angle detection method of a wind turbine generator system according to an embodiment of the present invention. As shown in fig. 1, the rotor position angle detection method includes:
s110, obtaining a motor side current and a motor side voltage of a converter of the wind generating set;
s120, calculating a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the motor side current and the motor side voltage;
and S130, calculating a rotor position angle of the wind generating set by using the current vector and the voltage vector.
According to the embodiment of the invention, the current vector and the voltage vector of the motor side of the converter can be calculated based on the current and the voltage of the motor side of the converter of the wind generating set, then the rotor position angle of the wind generating set is calculated by utilizing the current vector and the voltage vector, and the rotor position angle of the wind generating set is directly estimated by detecting the current and the voltage of the motor side of the converter, so that the detection precision of the rotor position angle of the wind generating set is improved, and the control error of the wind generating set is reduced.
In embodiment S110 of the present invention, a motor current breaker may be connected between a converter and a generator of the wind turbine generator system, and the motor-side voltage may be a voltage between the motor current breaker and the generator, or the motor-side voltage may also be a voltage between the motor current breaker and the converter. When the voltage on the motor side is the voltage between the motor current breaker and the converter, whether the rotor position angle is detected or not can be controlled through the opening and closing of the motor current breaker. When the voltage on the motor side is the voltage between the motor current breaker and the generator, the rotor position angle can be detected no matter whether the motor current breaker is closed or not as long as the generator is started, so that the grid-connected impact torque and the impact current of the wind generating set are reduced.
Fig. 2 shows a flowchart of a specific method of one embodiment of S120 in fig. 1. As shown in fig. 2, in S120, a specific method for calculating a current vector corresponding to the motor-side current and a voltage vector corresponding to the motor-side voltage according to the motor-side current and the motor-side voltage may include:
s210, determining a voltage phase angle corresponding to the voltage at the motor side;
s220, calculating a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the voltage phase angle, the motor side current and the motor side voltage.
In the embodiment S210 of the present invention, a voltage phase angle corresponding to the motor-side voltage can be obtained by phase-locking the motor-side voltage signal.
After the voltage phase angle is obtained, the voltage phase angle, the motor side current and the motor side voltage can be used for conversion calculation, so that a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage are calculated.
First, three-phase voltage coordinates and three-phase current coordinates of the motor side current and the motor side voltage in a three-phase stationary coordinate system can be determined, respectively.
Then, converting the three-phase voltage coordinate and the three-phase current coordinate into a two-phase voltage coordinate and a two-phase current coordinate under a two-phase static coordinate system respectively through a conversion formula of the three-phase static coordinate and the two-phase static coordinate:
wherein, Ua、Ub、UcVoltage coordinate values of a-axis, b-axis and c-axis in a three-phase static coordinate system, Uα、UβThe voltage coordinate values of the alpha axis and the beta axis in the two-phase static coordinate system are respectively. I isa、Ib、IcCurrent coordinate values of a-axis, b-axis and c-axis in a three-phase static coordinate system, Iα、IβThe current coordinate values of the alpha axis and the beta axis in the two-phase static coordinate system are respectively.
Then, converting the two-phase voltage coordinate and the two-phase current coordinate into a synchronous voltage coordinate and a synchronous current coordinate under a synchronous rotating coordinate system respectively by using a voltage phase angle through a conversion formula of the two-phase static coordinate and the synchronous rotating coordinate:
wherein, Uα、UβVoltage coordinate values of alpha axis and beta axis in two-phase static coordinate system, Ud、UqThe voltage coordinate values of the d axis and the q axis in the synchronous rotating coordinate system are respectively. I isα、IβCurrent coordinate values of alpha axis and beta axis in two-phase static coordinate system, Id、IqAre respectively synchronousAnd d-axis and q-axis current coordinate values in a rotating coordinate system.
And finally, calculating the voltage vector length and the voltage vector angle of the voltage vector and the current vector length and the current vector angle of the current vector through the synchronous voltage coordinate and the synchronous current coordinate.
Wherein, | USL is the voltage vector length, θuIs the voltage vector angle, | ISI is the current vector length, θIIs the current vector angle.
Fig. 3 shows a flowchart of a specific method of another embodiment of S120 in fig. 1. As shown in fig. 3, before determining the voltage phase angle corresponding to the motor-side voltage at S320, the method may further include:
s310, filtering the motor side voltage, and selecting the motor side voltage with the preset frequency.
In the embodiment S310 of the present invention, since the inverter modulates to generate the high-frequency interference signal, it is necessary to filter the voltage at the motor side, eliminate the interference signal, and select the voltage signal at the motor side with the predetermined frequency, so as to ensure the subsequent calculation.
Since the filtering may cause a phase shift to a voltage phase angle of the motor-side voltage signal, in order to restore the voltage phase angle to a phase angle corresponding to the actually collected motor-side voltage, after determining the voltage phase angle corresponding to the motor-side voltage in S320, the method may further include:
s330, obtaining the phase shift amount of the filtered motor side voltage;
and S340, performing phase shift compensation on the voltage phase angle according to the phase shift amount.
In embodiment S330 of the present invention, a phase shift amount generated by filtering on the motor side voltage may be obtained as the phase shift amount of the filtered motor side voltage. Then, in the embodiment S340 of the present invention, the phase shift compensation is performed on the voltage phase angle obtained by the phase-locked phase. If the phase angle is advanced due to filtering, subtracting the phase shift amount from the voltage phase angle to obtain a voltage phase angle after phase shift compensation; and if the phase angle is caused by filtering, obtaining the voltage phase angle after phase shift compensation by adding the voltage phase angle and the phase shift quantity.
Fig. 4 shows a flowchart of a specific method of one embodiment of S130 in fig. 1. As shown in fig. 4, the calculating the rotor position angle of the wind turbine generator set by using the current vector and the voltage vector S130 includes:
s131, calculating an internal potential phase angle of the wind generating set according to the current vector and the voltage vector;
s132, obtaining an angle difference value between a flux linkage vector angle corresponding to a flux linkage vector of the wind generating set and an internal potential phase angle;
and S133, determining a rotor position angle according to the internal potential phase angle and the angle difference value.
Fig. 5 shows a flowchart of a specific method of one embodiment of S131 in fig. 4. As shown in fig. 4, S131, calculating an internal potential phase angle of the wind turbine generator set according to the current vector and the voltage vector includes:
s410, determining voltage angular frequency corresponding to the voltage on the motor side;
s420, calculating an internal potential vector of the wind generating set by using a generator potential equation according to the current vector, the voltage vector and the voltage angular frequency;
and S430, determining an internal potential phase angle according to the internal potential vector.
In embodiment S410 of the present invention, the voltage angular frequency may also be obtained through the aforementioned phase locking process. Then, in embodiment S420 of the present invention, an internal potential vector of the wind turbine generator system is calculated using the generator potential equation according to the current vector, the voltage vector, and the voltage angular frequency.
Taking a surface-mounted Permanent Magnet Synchronous Motor (PMSM) as an example, a generator potential equation of the surface-mounted PMSM is as follows:
wherein the content of the first and second substances,
in the form of a vector of voltages, the voltage vector,
is a current vector, RsAs direct current resistance of the generator winding, omegasIs the voltage angular frequency, LsIs the equivalent inductance of the generator,
and j is an equation operator for the internal potential vector.
Next, in S430 according to the embodiment of the present invention, the internal potential phase angle can be determined according to the calculated internal potential vector.
Since the flux linkage vector angle of the flux linkage vector is the same as the rotor position angle in the synchronous rotating coordinate system, in embodiment S132 of the present invention, the difference between the flux linkage vector angle and the internal potential phase angle may be determined, and then, in embodiment S133 of the present invention, the rotor position angle may be calculated according to the internal potential phase angle and the angle difference.
Figure 6 shows a generator vector diagram for one embodiment of the present invention. As shown in FIG. 6, the horizontal axis is the d-axis of the synchronous rotation coordinate system, the vertical axis is the q-axis of the synchronous rotation coordinate system,
for the flux linkage vector, it can be seen that the flux linkage vector angle leads the phase angle of the internal potential by an angle of
Thus, the internal potential phase angle can be subtracted
The rotor position angle can be obtained.
Fig. 7 shows a schematic structural diagram of a rotor position angle detection device of a wind turbine generator system according to an embodiment of the invention. As shown in fig. 7, the rotor position angle detection device includes:
a current obtaining module 510, configured to obtain a motor-side current of a converter of the wind turbine generator system;
a voltage obtaining module 520, configured to obtain a motor-side voltage of a converter of the wind turbine generator system;
the vector calculation module 530, the vector calculation module 530 is respectively connected to the current acquisition module 510 and the voltage acquisition module 520, and is configured to calculate a current vector corresponding to the motor-side current and a voltage vector corresponding to the motor-side voltage according to the motor-side current and the motor-side voltage;
and the position calculation module 540, the position calculation module 540 is connected with the vector calculation module 530, and is used for calculating a rotor position angle of the wind generating set by using the current vector and the voltage vector.
According to the embodiment of the invention, the current vector and the voltage vector of the motor side of the converter can be calculated based on the current and the voltage of the motor side of the converter of the wind generating set, then the rotor position angle of the wind generating set is calculated by utilizing the current vector and the voltage vector, and the rotor position angle of the wind generating set is directly estimated by detecting the current and the voltage of the motor side of the converter, so that the detection precision of the rotor position angle of the wind generating set is improved, and the control error of the wind generating set is reduced.
In an embodiment of the present invention, the rotor position angle detecting apparatus further includes:
the phase-locked loop 550 and the phase-locked loop 550 are respectively connected to the voltage acquisition module 520 and the vector calculation module 530, and are configured to determine a voltage phase angle corresponding to the motor-side voltage, and send the voltage phase angle to the vector calculation module 530, so that the vector calculation module 530 calculates a current vector corresponding to the motor-side current and a voltage vector corresponding to the motor-side voltage according to the voltage phase angle, the motor-side current and the motor-side voltage.
In the embodiment of the present invention, between the phase-locked loop 550 and the voltage acquisition module 520, the method further includes:
the low-pass filter 560, the low-pass filter 560 is connected to the voltage acquisition module 520, and is used for filtering a high-frequency interference signal of the motor-side voltage;
a band pass filter 570, the band pass filter 570 being connected to the low pass filter 560 and the phase locked loop 550 for selecting a motor side voltage of a predetermined frequency.
In this embodiment of the present invention, between the phase-locked loop 550 and the vector calculating module 530, further includes:
and the phase shift compensator 580 is configured to obtain a phase shift amount of the filtered motor-side voltage, and perform phase shift compensation on a voltage phase angle according to the phase shift amount.
In the embodiment of the present invention, the phase-locked loop 550 is further connected to the position calculation module 540, wherein the phase-locked loop 550 is further configured to determine a voltage angular frequency corresponding to the voltage on the motor side and send the voltage angular frequency to the position calculation module 540, and the position calculation module 540 calculates an internal potential vector of the wind turbine generator system according to the current vector, the voltage vector and the voltage angular frequency by using a generator potential equation, and then determines an internal potential phase angle according to the internal potential vector.
In one embodiment of the invention, the rotor position angle detection device of the wind generating set can be arranged in a controller of the converter. In another embodiment of the invention, the rotor position angle detection device of the wind generating set can be arranged as an independent control module.
Fig. 8 is a schematic structural diagram of an example of the rotor position angle detection device and the wind turbine generator set according to the embodiment of the present invention.
As shown in fig. 8, a motor current breaker 603, a DU/DT filter 604, a converter 605, an LC filter 606, and a converter grid side main breaker 607 are connected in this order between a generator 601 and a grid 602.
The current obtaining module 608 and the voltage obtaining module 609 can be respectively connected to a line between the DU/DT filter 604 and the converter 605 through corresponding sensors, the current obtaining module 608 and the voltage obtaining module 609 are respectively connected to the vector calculating module 610, the voltage obtaining module 609 is further connected to the vector calculating module 610 through the low pass filter 611, the band pass filter 612, the phase-locked loop 613 and the phase shift compensator 614 in sequence, and then the vector calculating module 610 and the phase shift compensator 614 are respectively connected to the position calculating module 615.
In another embodiment of the present invention, the voltage obtaining module 609 can be connected to a line between the motor current breaker 603 and the generator 601 through a sensor, and at this time, as long as the generator 601 is started, whether the motor current breaker 603 is closed or not, the rotor position angle of the generator 601 can be detected, so as to reduce the grid-connected impact torque and impact current of the generator 601.
In other embodiments, the voltage acquisition module 609 may also be connected to the line between the motor current breaker 603 and the DU/DT filter 604 via a sensor.
In the embodiment shown in fig. 8, the current acquisition module 608 is provided separately, and in other embodiments, the current acquisition module 608 may not be provided separately, and an integrated current sensor in a controller of the current transformer 605 may be directly used as the current acquisition module 608.
It should be noted that the exemplary embodiments of 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-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 (6)
1. A rotor position angle detection method of a wind generating set is characterized by comprising the following steps:
acquiring motor side current and motor side voltage of a converter of the wind generating set;
calculating a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the motor side current and the motor side voltage;
calculating a rotor position angle of the wind generating set by using the current vector and the voltage vector;
wherein said calculating a rotor position angle of the wind turbine generator set using the current vector and the voltage vector comprises:
calculating an internal potential phase angle of the wind generating set according to the current vector and the voltage vector;
acquiring an angle difference value between a flux linkage vector angle corresponding to a flux linkage vector of the wind generating set and the internal potential phase angle;
determining the rotor position angle according to the internal potential phase angle and the angle difference value;
the calculating a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the motor side current and the motor side voltage includes:
phase locking is carried out on the motor side voltage to obtain a voltage phase angle corresponding to the motor side voltage;
calculating a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the voltage phase angle, the motor side current and the motor side voltage;
the calculating an internal potential phase angle of the wind turbine generator set according to the current vector and the voltage vector comprises:
determining a voltage angular frequency corresponding to the motor side voltage;
calculating an internal potential vector of the wind generating set by using a generator potential equation according to the current vector, the voltage vector and the voltage angular frequency;
determining the internal potential phase angle from the internal potential vector.
2. The method for detecting the rotor position angle of the wind generating set according to claim 1, wherein before determining the voltage phase angle corresponding to the voltage on the motor side, the method further comprises:
filtering the motor side voltage, and selecting the motor side voltage with preset frequency; or/and the light source is arranged in the light path,
after the voltage phase angle corresponding to the motor side voltage is determined, the method further comprises the following steps:
acquiring a phase shift amount of the filtered motor side voltage;
and performing phase shift compensation on the voltage phase angle according to the phase shift quantity.
3. The method according to claim 1, wherein a motor current breaker is connected between a converter and a generator of the wind turbine generator system, and the motor-side voltage is a voltage between the motor current breaker and the generator or a voltage between the motor current breaker and the converter.
4. A rotor position angle detection device of a wind generating set is characterized by comprising:
the current acquisition module is used for acquiring the motor side current of a converter of the wind generating set;
the voltage acquisition module is used for acquiring the motor side voltage of a converter of the wind generating set;
the vector calculation module is respectively connected with the current acquisition module and the voltage acquisition module and is used for calculating a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the motor side current and the motor side voltage;
the position calculation module is connected with the vector calculation module and used for calculating a rotor position angle of the wind generating set by utilizing the current vector and the voltage vector;
wherein the position calculation module is specifically configured to: calculating an internal potential phase angle of the wind generating set according to the current vector and the voltage vector; acquiring an angle difference value between a flux linkage vector angle corresponding to a flux linkage vector of the wind generating set and the internal potential phase angle; determining the rotor position angle according to the internal potential phase angle and the angle difference value;
the rotor position angle detection device of the wind generating set further comprises: the phase-locked loop is respectively connected with the voltage acquisition module and the vector calculation module and is used for determining a voltage phase angle corresponding to the motor side voltage and sending the voltage phase angle to the vector calculation module, so that the vector calculation module calculates a current vector corresponding to the motor side current and a voltage vector corresponding to the motor side voltage according to the voltage phase angle, the motor side current and the motor side voltage;
the phase-locked loop is further connected with the position calculation module, wherein the phase-locked loop is used for determining a voltage angular frequency corresponding to the voltage on the motor side and sending the voltage angular frequency to the position calculation module, the position calculation module calculates an internal potential vector of the wind generating set by using a generator potential equation according to the current vector, the voltage vector and the voltage angular frequency, and then determines the internal potential phase angle according to the internal potential vector.
5. The rotor position angle detection device of a wind generating set according to claim 4, wherein between the phase-locked loop and the voltage acquisition module, further comprising:
the low-pass filter is connected with the voltage acquisition module and is used for filtering high-frequency interference signals of the motor side voltage;
and the band-pass filter is connected with the low-pass filter and the phase-locked loop and is used for selecting the motor side voltage with the preset frequency.
6. The device for detecting the rotor position angle of the wind generating set according to claim 4, wherein between the phase-locked loop and the vector calculation module, the device further comprises:
and the phase shift compensator is used for acquiring the phase shift quantity of the filtered motor side voltage and performing phase shift compensation on the voltage phase angle according to the phase shift quantity.
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