CN116202946A - Rectification control method, system, electronic equipment and readable storage medium - Google Patents
Rectification control method, system, electronic equipment and readable storage medium Download PDFInfo
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Abstract
The application discloses a rectification control method, a rectification control system, electronic equipment and a readable storage medium, and relates to the field of power electronics, wherein the rectification control method comprises the following steps: acquiring actual inter-harmonic current of preset frequency in network side current of a rectifier; performing phase angle correction on the actual inter-harmonic current according to a preset phase angle offset to obtain corrected inter-harmonic current corresponding to the phase angle of the current modulation wave voltage of the rectifier; and adjusting the current modulation wave voltage according to the corrected inter-harmonic current and controlling the rectifier according to the current modulation wave voltage so as to reduce the actual inter-harmonic current in the network side current. According to the method, the inter-harmonic current in the network side current is extracted and corrected to be used as the adjustment basis of the modulation wave voltage, closed-loop feedback of the inter-harmonic current is achieved, through the closed-loop feedback, the content of the actual inter-harmonic current in the network side current which is output after the rectifier rectifies according to the modulation wave voltage is reduced, and therefore the performance influence of the inter-harmonic on system equipment is reduced.
Description
Technical Field
The present invention relates to the field of power electronics, and in particular, to a rectification control method, system, electronic device, and readable storage medium.
Background
With the development of power electronic technology, an alternating current transmission converter adopting a rectification topology of a full-control device is widely applied to industries such as rail transit vehicles, new energy power generation, industrial transmission and the like. The converter using the power electronics has not only integer harmonics but also inter-harmonics. The inter-harmonic wave is often caused by voltage fluctuation or nonlinear load, and all nonlinear or fluctuation loads, such as various variable-frequency speed regulating devices, induction motors and the like, are inter-harmonic wave sources.
When the inter-harmonic is large, distortion exists in the network side current of the rectifier, the performance of each device is reduced, and the device cannot normally operate and even is damaged when the inter-harmonic is serious. Especially in the track traffic industry, when the inter-harmonic of the alternating current transmission system network side current of the track traffic vehicle is too large, not only are all standard requirements difficult to meet, but also signal communication of a ground track circuit is interfered when serious, so that normal operation of the track traffic vehicle is affected.
The effects and hazards of inter-harmonics have recently led to increasing emphasis in the industry. In the field of rail transit, because ground track circuit signal communication itself uses electric signals with frequencies that are not integral multiples to communicate, there is a stricter standard for inter-harmonics of network side currents of rail transit vehicles (locomotives, motor train units, etc.). The requirements of the EU railways such as TSI/ERA/ERTMS/033281 standard, NNTR and the like all have related limit requirements on rail transit vehicles.
However, there is no mature and effective technical solution in the current rail transit field about how to reduce and eliminate the inter-harmonic of the network side current, and the inter-harmonic content of the network side current in the current power electronic control solution for the transit rail vehicles is still higher.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention is directed to a rectification control method, system, electronic device and readable storage medium for reducing inter-harmonics. The specific scheme is as follows:
a rectification control method, comprising:
acquiring actual inter-harmonic current of preset frequency in network side current of a rectifier;
performing phase angle correction on the actual inter-harmonic current according to a preset phase angle offset to obtain corrected inter-harmonic current corresponding to the phase angle of the current modulation wave voltage of the rectifier;
and adjusting the current modulation wave voltage according to the corrected inter-harmonic current and controlling the rectifier according to the current modulation wave voltage so as to reduce the actual inter-harmonic current in the grid-side current.
Preferably, the process of obtaining the actual inter-harmonic current with the preset frequency in the network side current of the rectifier includes:
the actual inter-harmonic current with preset frequency in the network side current of the rectifier is obtained through the wave trap.
Preferably, the preset phase angle offset includes:
a first phase angle offset between the present modulated wave voltage and the actual inter-harmonic current, and/or a second phase angle offset generated by the trap when acquiring the actual inter-harmonic current.
Preferably, the process of adjusting the current modulation wave voltage according to the corrected inter-harmonic current includes:
subtracting the reference inter-harmonic current set value from the corrected inter-harmonic current, and performing closed-loop control to obtain inter-harmonic voltage;
and updating the current modulation wave voltage to be a superposition value of the opposite value of the inter-harmonic voltage and the current modulation wave voltage.
Preferably, the process of adjusting the current modulation wave voltage according to the corrected inter-harmonic current includes:
taking the result of multiplying the corrected inter-harmonic current by a preset proportional coefficient as inter-harmonic voltage;
and updating the current modulation wave voltage to be a superposition value of the opposite value of the inter-harmonic voltage and the current modulation wave voltage.
Preferably, the process of controlling the rectifier according to the current modulated wave voltage includes:
the carrier frequency of the rectifier is increased from the current carrier frequency to a preset carrier frequency, and the preset carrier frequency is not smaller than the current carrier frequency;
generating expected action time for each switch in the rectifier according to the current modulation wave voltage and the preset carrier frequency;
according to the dead time of the switch in the rectifier and the expected action moment, dead time advance compensation is carried out on the corresponding dead time to obtain the instruction action moment;
and controlling the corresponding switch in the rectifier according to all the command action moments.
Preferably, before controlling the rectifier according to the current modulated wave voltage, the method further comprises:
setting the carrier phase shift angle of the rectifiers to be (pi/N+alpha), wherein N is a positive integer, the number of all the rectifiers is represented, and alpha is a preset deviation angle.
Preferably, the rectification control method further includes:
filtering the grid-side current through a filtering winding;
the filter winding is a transformer winding on the same side as the rectifier.
Preferably, the process of performing phase angle correction on the actual inter-harmonic current according to a preset phase angle offset to obtain a corrected inter-harmonic current corresponding to the phase angle of the current modulated wave voltage of the rectifier includes:
and shifting the actual phase angle of the actual inter-harmonic current by a preset phase angle shift amount to obtain a corrected inter-harmonic current corresponding to the phase angle of the current modulation wave voltage of the rectifier.
Preferably, before adjusting the current modulation wave voltage according to the corrected inter-harmonic current and controlling the rectifier according to the current modulation wave voltage to reduce the actual inter-harmonic current in the grid-side current, the method further comprises:
and determining the current modulation wave voltage through a double closed-loop control strategy according to the actual current, the actual intermediate voltage and the reference intermediate voltage of the rectifier.
Preferably, when the current loop control in the dual closed loop control strategy is PI control, the scaling factor of the PI control is the minimum value reaching the preset response condition.
Preferably, when the current loop control in the dual closed loop control strategy is PR control, the proportionality coefficient is the minimum value reaching a preset response condition, and/or the resonance coefficient is the maximum value reaching the preset response condition, and/or the cut-off frequency is the minimum value reaching the preset response condition.
Correspondingly, the application also discloses a rectification control system, which comprises:
the acquisition module is used for acquiring actual inter-harmonic current with preset frequency in network side current of the rectifier;
the correction module is used for carrying out phase angle correction on the actual inter-harmonic current according to a preset phase angle offset to obtain corrected inter-harmonic current corresponding to the phase angle of the current modulation wave voltage of the rectifier;
and the adjusting module is used for adjusting the current modulation wave voltage according to the corrected inter-harmonic current and controlling the rectifier according to the current modulation wave voltage so as to reduce the actual inter-harmonic current in the grid-side current.
Correspondingly, the application also discloses electronic equipment, which comprises:
a memory for storing a computer program;
a processor for implementing the steps of the rectification control method as claimed in any one of the preceding claims when executing said computer program.
Accordingly, the present application also discloses a readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the rectification control method as described in any one of the above.
According to the method, the inter-harmonic current in the network side current is extracted and corrected to be used as the adjustment basis of the modulation wave voltage, closed-loop feedback of the inter-harmonic current is achieved, through the closed-loop feedback, the content of the actual inter-harmonic current in the network side current which is output after the rectifier rectifies according to the modulation wave voltage is reduced, and therefore the performance influence of the inter-harmonic on system equipment is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart illustrating steps of a rectification control method according to an embodiment of the present invention;
FIG. 2 is a bode diagram of a trap in an embodiment of the present invention;
FIG. 3 is a bode plot of phase corrected inter-harmonic current according to an embodiment of the present invention;
FIG. 4 is a control schematic diagram of a dual closed loop control strategy according to an embodiment of the present invention;
FIG. 5 is a control schematic diagram of a specific dual closed loop control strategy in an embodiment of the present invention;
FIG. 6 is a control schematic diagram of another specific dual closed loop control strategy in an embodiment of the present invention;
fig. 7 is a structural diagram of a rectification control system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
At present, the field of rail transit has no mature and effective technical scheme about how to reduce and eliminate the inter-harmonic of the network side current, and the inter-harmonic content of the network side current in the current power electronic control scheme of the transit rail vehicle is still higher.
According to the method, the inter-harmonic current in the network side current is extracted and corrected to be used as the adjustment basis of the modulation wave voltage, closed-loop feedback of the inter-harmonic current is achieved, through the closed-loop feedback, the content of the actual inter-harmonic current in the network side current which is output after the rectifier rectifies according to the modulation wave voltage is reduced, and therefore the performance influence of the inter-harmonic on system equipment is reduced.
The embodiment of the invention discloses a rectification control method, which is shown in fig. 1 and comprises the following steps:
s1: acquiring actual inter-harmonic current of preset frequency in network side current of a rectifier;
it can be understood that the actual inter-harmonic current can be obtained through a trap or a band-pass filter with a preset frequency as a center frequency, wherein the trap is suitable for narrow-band inter-harmonic waves, the band-pass filter is suitable for wide-band inter-harmonic waves, and the optimal inter-harmonic extraction effect can be achieved by adjusting the trap or the band-pass filter, so that the instantaneous current of the actual inter-harmonic current with the preset frequency is obtained. Thus, step S1 may comprise: the actual inter-harmonic current with preset frequency in the network side current of the rectifier is obtained through the wave trap.
Taking fig. 2 as an example, fig. 2 is a diagram of an exemplary trap, which has a center frequency of 73.03, and when the preset frequency is near the center frequency, the trap of fig. 2 may be used to obtain the actual inter-harmonic current at the preset frequency.
S2: performing phase angle correction on the actual inter-harmonic current according to a preset phase angle offset to obtain corrected inter-harmonic current corresponding to the phase angle of the current modulation wave voltage of the rectifier;
wherein, the preset phase angle offset includes: a first phase angle offset between the modulated wave voltage and the actual inter-harmonic current, and/or a second phase angle offset generated by the trap when acquiring the actual inter-harmonic current.
It is understood that step S2 specifically includes: and shifting the actual phase angle of the actual inter-harmonic current by a preset phase angle shift amount to obtain a corrected inter-harmonic current corresponding to the phase angle of the current modulation wave voltage of the rectifier. Further, the direction of the actual phase angle offset includes forward and backward movement, and the specific direction determination may be determined based on the sign of the first phase angle offset and the second phase angle offset, such as a bode plot of an example shown in fig. 3, which compares the actual inter-harmonic current with the corrected inter-harmonic current after phase angle correction, which in this example is the result of the actual inter-harmonic current being offset by the preset phase angle offset. It will be appreciated that fig. 3 is merely an example, and that the direction of the actual phase angle offset needs to be determined according to the actual situation, and is not limited thereto.
S3: and adjusting the current modulation wave voltage according to the corrected inter-harmonic current and controlling the rectifier according to the current modulation wave voltage so as to reduce the actual inter-harmonic current in the network side current.
It can be appreciated that in this embodiment, the current modulated wave voltage is determined according to the actual current, the actual intermediate voltage and the reference intermediate voltage of the rectifier through a control strategy, where the control strategy may generally be a dual closed loop control strategy, and the main current control strategy includes transient current control, D-Q current decoupling control, and predictive current control. Taking transient current control as an example, a control schematic diagram of the double closed loop control strategy is shown in fig. 4, wherein U is as follows ref For referencing, i.e. specifying, intermediate voltage, U dc I is the actual intermediate voltage dref I is a specified current obtained by intermediate voltage closed-loop control N For the actual input current, i.e. the actual current, u p To obtain initial modulation wave voltage by input current closed-loop control, the modulation wave u is output after adder c The modulation wave is input into a PWM modulation module to obtain a pulse signal for controlling the switching action of the rectifier.
The method comprises the steps of adding an inter-harmonic suppression closed-loop control link, obtaining inter-harmonic voltage by referring to an inter-harmonic current set value as 0 through closed-loop control such as PR control or PI control, and superposing the inter-harmonic voltage on the current modulated wave voltage, so that the current modulated wave voltage of the rectifier carries out real-time closed-loop feedback adjustment along with the value of the inter-harmonic after correction, and the content of actual inter-harmonic current in the current of a subsequent network side is reduced; and the other is to multiply the corrected inter-harmonic current by a preset proportionality coefficient to obtain inter-harmonic voltage, and superimpose the inter-harmonic voltage on the current modulation wave voltage to enable the current modulation wave voltage of the rectifier to carry out real-time closed-loop feedback adjustment along with the value of the corrected inter-harmonic, thereby reducing the content of the actual inter-harmonic current in the subsequent network side current.
Therefore, the step S3 adjusts the current modulation wave voltage according to the corrected inter-harmonic current, which may specifically include:
subtracting the reference inter-harmonic current set value from the corrected inter-harmonic current, and performing closed-loop control to obtain inter-harmonic voltage;
and updating the current modulation wave voltage to be the superposition value of the opposite value of the inter-harmonic voltage and the current modulation wave voltage.
As shown in fig. 5, wherein i Nfilter To correct the inter-harmonic, the inter-harmonic current setting value is referenced to be 0, and the inter-harmonic voltage u is output after closed loop control f The inter-harmonic voltage is compared with the initial modulation wave voltage u p Obtaining updated modulation wave voltage u through adder-subtracter c . It will be appreciated that the initial modulated wave voltage u, if there is no superposition of inter-harmonic voltages p And a modulated wave voltage u for PWM modulation c Equal, thus initial modulated wave voltage u p In effect, the current modulated wave voltage is not updated.
Or, the step S3 adjusts the current modulation wave voltage according to the corrected inter-harmonic current, which may specifically include:
taking the result of multiplying the corrected inter-harmonic current by a preset proportional coefficient as inter-harmonic voltage;
and updating the current modulation wave voltage to be the superposition value of the opposite value of the inter-harmonic voltage and the current modulation wave voltage.
As shown in fig. 6, wherein i Nfilter To correct the latter harmonic, the preset proportionality coefficient is K1, and the voltage u of the harmonic is output after multiplication f The inter-harmonic voltage is compared with the initial modulation wave voltage u p Obtaining updated modulation wave voltage u through adder-subtracter c 。
It will be appreciated that after updating the current modulated wave voltage, PWM modulation is performed according to the updated modulated wave voltage to obtain a pulse, and the pulse will control the switching action in the rectifier, so that the rectifier outputs a corresponding network side current. When the current modulation wave voltage is not updated, the actual inter-harmonic current content in the network side current is higher, and after the current modulation wave voltage is updated, the actual inter-harmonic current content in the network side current output by the rectifier is obviously reduced.
According to the method, the inter-harmonic current in the network side current is extracted and corrected to be used as the adjustment basis of the modulation wave voltage, closed-loop feedback of the inter-harmonic current is achieved, through the closed-loop feedback, the content of the actual inter-harmonic current in the network side current which is output after the rectifier rectifies according to the modulation wave voltage is reduced, and therefore the performance influence of the inter-harmonic on system equipment is reduced.
The embodiment of the invention discloses a specific rectification control method, and compared with the previous embodiment, the embodiment further describes and optimizes the technical scheme. Specifically, in order to reduce the inter-harmonic current content, other technical measures may be further added, such as improving the network side current quality, adjusting the network side current harmonic distribution, filtering out specific inter-harmonics, and the like.
It can be understood that, in order to further reduce the actual inter-harmonic current content in the grid-side current, besides the closed-loop feedback of the inter-harmonic current adopted in step S3, parameters of the control rectifier can be adjusted to make the grid-side current closer to a sine wave, and improve the quality of the grid-side current, so as to reduce the inter-harmonic content. Specific adjustment means include increasing the carrier frequency, shortening the dead time, performing dead time compensation, etc., and thus, the process of controlling the rectifier according to the current modulated wave voltage may include:
the carrier frequency of the rectifier is increased from the current carrier frequency to a preset carrier frequency, and the preset carrier frequency is not smaller than the current carrier frequency;
generating expected action time of each switch in the rectifier according to the current modulation wave voltage and the preset carrier frequency;
according to the dead time requirement and the expected action moment of a switch in the rectifier, dead time advance compensation is carried out on the corresponding dead time, and the instruction action moment is obtained;
and controlling corresponding switches in the rectifier according to all instruction action moments.
It can be understood that, for the application of the dead time requirement, the instruction action time is obtained by delaying the corresponding dead time at the expected action time, the method easily causes the loss of the pulse signal of the PWM modulation, so that the switching pulse voltage actually output is partially lost, and further the current waveform at the network side is distorted, resulting in the increase of the inter-harmonic wave. Therefore, in this embodiment, the expected action time is advanced according to the dead time requirement, that is, the dead time is compensated in advance to obtain the command action time, the switch is controlled by the command action time, even if the actual action time of the switch is affected by the dead time in the process of the actual action time of the switch after receiving the control command, the actual action time of the switch is closer to the expected action time, and when all the actual action times of the switch are close to the expected action time, the pulse integrity is higher, the network side current of the rectifier is closer to the sine wave corresponding to the expected action time, so that the current quality is increased, and the harmonic content is reduced.
Correspondingly, the carrier frequency is increased to increase the switching frequency, so that the harmonic wave can move to a higher frequency, the numerical value of the harmonic wave tends to be reduced, and the effect of reducing the inter-harmonic wave is further achieved. It can be understood that only increasing the switching frequency without adjusting the switching time will result in an increase of the lower harmonics and possibly an increase of the inter-harmonic content, so that the switching frequency is increased and the switching time is required to be advanced according to the dead time, thereby effectively improving the current quality and reducing the inter-harmonic content.
Further, for the multiple PWM rectifiers, carrier phase shifting is used to increase the lowest subharmonic ratio of the grid current, so as to improve the harmonic characteristic of the grid current, so before the rectifier is controlled according to the current modulated wave voltage, the method may further include:
setting the carrier phase shift angle of the rectifiers to be (pi/N+alpha), wherein N is a positive integer, the number of all rectifiers is represented, and alpha is a preset deviation angle.
Furthermore, the inter-harmonic current component in the network side current can be filtered by a reasonable filter circuit, the filter circuit comprises a reasonable capacitor, and/or an inductor and/or a resistor, the filter circuit is usually arranged on a circuit between the transformer and the rectifier in the form of a filter winding, one side winding of the original transformer is connected with the network side of the rectifier, the filter winding can be directly connected in series on a connecting circuit between the side winding of the original transformer and the network side of the rectifier, the filter circuit can also be connected in parallel with the side winding of the transformer, and the position and the element parameters of the filter winding can be specifically selected according to working conditions and actual requirements. That is, the rectification control method may further include:
filtering the current at the net side through a filtering winding;
the filter winding is a transformer winding on the same side as the rectifier.
The embodiment of the invention discloses a specific rectification control method, and compared with the previous embodiment, the embodiment further describes and optimizes the technical scheme. Specifically, before adjusting the current modulation wave voltage according to the corrected inter-harmonic current and controlling the rectifier according to the current modulation wave voltage to reduce the actual inter-harmonic current in the network side current, the method further comprises: and determining the current modulation wave voltage through a double closed-loop control strategy according to the actual current, the actual intermediate voltage and the reference intermediate voltage of the rectifier.
Furthermore, the double closed-loop control strategy can be further optimized aiming at the aim of eliminating the inter-harmonic, specifically, the control parameters of the current loop influence the response of the rectifier, the control parameters of the current loop are overlarge, and the current loop is easy to amplify the inter-harmonic of the current at the network side; but simultaneously, the current loop is used as an inner loop, so that the current on the network side can quickly follow a current instruction, the current sine degree is ensured, and the dynamic response of the current transformer is improved, and therefore, the current loop parameters are not required to be too small. Thus, proper adjustment of the control parameters of the current loop is required. Under the condition that various control requirements can be met, the inter-current harmonics can be reduced.
Specifically, when the current loop control in the dual closed loop control strategy is PI control, the transfer function GPI is:
wherein K is a proportionality coefficient, and T is a time constant;
when optimizing the control parameters of the current loop, the scaling factor is mainly optimized, and a specific optimization target can be selected as the scaling factor of PI control to reach the minimum value of the preset response condition.
Similarly, when the current loop control in the dual closed loop control strategy is PR control, its transfer function G quasi-PR (s) is specifically:
wherein is k p Scaling factor, k r Is the resonance coefficient omega r Is the resonant frequency omega c Is the cut-off frequency.
It can be understood that the values of the control parameters are different, the influence on the amplitude-frequency characteristics of the current loop controller is also different, and particularly, the proportional coefficient influences the amplitude gains of other frequency sections except the fundamental frequency, and the amplitude gains are in positive correlation; the resonance coefficient determines the gain at the fundamental frequency; the cut-off frequency influences the bandwidth of the controller, the larger the cut-off frequency is, the higher the system bandwidth is, meanwhile, the gain near the resonance frequency is correspondingly increased, and the cut-off frequency is reasonably selected by considering factors of the gain and the bandwidth. Reasonable parameters are selected to inhibit inter-harmonics through PR controller characteristics, so that parameter setting is required to ensure that the boost at a fundamental frequency is large, the frequency band outside the fundamental frequency can be attenuated rapidly, the inter-harmonics can be weakened at a current loop control part, and specific optimization targets can be selected as follows: in the control parameters for PR control, the proportionality coefficient is the minimum value reaching the preset response condition, and/or the resonance coefficient is the maximum value reaching the preset response condition, and/or the cutoff frequency is the minimum value reaching the preset response condition. Specifically, the values of the parameters can be selected as follows: the proportionality coefficient is 2, the resonance coefficient is 5, and the cutoff frequency is 1.
Correspondingly, the embodiment of the application also discloses a rectification control system, as shown in fig. 7, including:
the acquisition module 1 is used for acquiring actual inter-harmonic current with preset frequency in network side current of the rectifier;
the correction module 2 is used for carrying out phase angle correction on the actual inter-harmonic current according to a preset phase angle offset to obtain corrected inter-harmonic current corresponding to the phase angle of the current modulation wave voltage of the rectifier;
and the adjusting module 3 is used for adjusting the current modulation wave voltage according to the corrected inter-harmonic current and controlling the rectifier according to the current modulation wave voltage so as to reduce the actual inter-harmonic current in the grid-side current.
According to the embodiment of the application, the inter-harmonic current in the network side current is extracted and corrected and then used as the adjustment basis of the modulation wave voltage, so that the closed-loop feedback of the inter-harmonic current is realized, and the content of the actual inter-harmonic current in the network side current which is output after the rectifier rectifies according to the modulation wave voltage is reduced through the closed-loop feedback, so that the influence of the inter-harmonic on the performance of system equipment is reduced.
In some specific embodiments, the process of obtaining the actual inter-harmonic current with the preset frequency in the network side current of the rectifier includes:
the actual inter-harmonic current with preset frequency in the network side current of the rectifier is obtained through the wave trap.
In some specific embodiments, the preset phase angle offset includes:
a first phase angle offset between the present modulated wave voltage and the actual inter-harmonic current, and/or a second phase angle offset generated by the trap when acquiring the actual inter-harmonic current.
In some specific embodiments, the process of adjusting the current modulated wave voltage according to the corrected inter-harmonic current includes:
subtracting the reference inter-harmonic current set value from the corrected inter-harmonic current, and performing closed-loop control to obtain inter-harmonic voltage;
and updating the current modulation wave voltage to be a superposition value of the opposite value of the inter-harmonic voltage and the current modulation wave voltage.
In some specific embodiments, the process of adjusting the current modulated wave voltage according to the corrected inter-harmonic current includes:
taking the result of multiplying the corrected inter-harmonic current by a preset proportional coefficient as inter-harmonic voltage;
and updating the current modulation wave voltage to be a superposition value of the opposite value of the inter-harmonic voltage and the current modulation wave voltage.
In some specific embodiments, the process of controlling the rectifier according to the current modulated wave voltage includes:
the carrier frequency of the rectifier is increased from the current carrier frequency to a preset carrier frequency, and the preset carrier frequency is not smaller than the current carrier frequency;
generating expected action time for each switch in the rectifier according to the current modulation wave voltage and the preset carrier frequency;
according to the dead time of the switch in the rectifier and the expected action moment, dead time advance compensation is carried out on the corresponding dead time to obtain the instruction action moment;
and controlling the corresponding switch in the rectifier according to all the command action moments.
In some specific embodiments, the adjusting module 3 is further configured to, before controlling the rectifier according to the current modulated wave voltage:
setting the carrier phase shift angle of the rectifiers to be (pi/N+alpha), wherein N is a positive integer, the number of all the rectifiers is represented, and alpha is a preset deviation angle.
In some specific embodiments, the rectification control system further comprises a filtering module for:
filtering the grid-side current through a filtering winding;
the filter winding is a transformer winding on the same side as the rectifier.
In some specific embodiments, the step of performing phase angle correction on the actual inter-harmonic current according to a preset phase angle offset to obtain a corrected inter-harmonic current corresponding to a phase angle of a current modulated wave voltage of the rectifier includes:
and shifting the actual phase angle of the actual inter-harmonic current by a preset phase angle shift amount to obtain a corrected inter-harmonic current corresponding to the phase angle of the current modulation wave voltage of the rectifier.
In some specific embodiments, before adjusting the current modulation wave voltage according to the corrected inter-harmonic current and controlling the rectifier according to the current modulation wave voltage to reduce the actual inter-harmonic current in the grid-side current, the method further comprises:
and determining the current modulation wave voltage through a double closed-loop control strategy according to the actual current, the actual intermediate voltage and the reference intermediate voltage of the rectifier.
In some specific embodiments, when the current loop control in the dual closed loop control strategy is PI control, the scaling factor of the PI control is the minimum value for reaching a preset response condition.
In some specific embodiments, when the current loop control in the dual closed loop control strategy is PR control, the proportionality coefficient is a minimum value reaching a preset response condition, and/or the resonance coefficient is a maximum value reaching the preset response condition, and/or the cutoff frequency is a minimum value reaching the preset response condition.
Correspondingly, the application also discloses electronic equipment, which comprises:
a memory for storing a computer program;
a processor for implementing the steps of the rectification control method as described in any one of the embodiments above when executing the computer program.
Accordingly, the present application also discloses a readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the rectification control method as described in any of the embodiments above.
Details of the rectification control method in this embodiment may be described with reference to the details in the above embodiments, which are not repeated here.
The electronic device and the readable storage medium in this embodiment have the same technical effects as those of the rectification control method in the previous embodiment, and are not described herein again.
Finally, it is further noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description of the present invention provides a rectification control method, system, electronic device and readable storage medium, and specific examples are applied to illustrate the principles and embodiments of the present invention, where the above description of the embodiments is only used to help understand the method and core idea of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (15)
1. A rectification control method, characterized by comprising:
acquiring actual inter-harmonic current of preset frequency in network side current of a rectifier;
performing phase angle correction on the actual inter-harmonic current according to a preset phase angle offset to obtain corrected inter-harmonic current corresponding to the phase angle of the current modulation wave voltage of the rectifier;
and adjusting the current modulation wave voltage according to the corrected inter-harmonic current and controlling the rectifier according to the current modulation wave voltage so as to reduce the actual inter-harmonic current in the grid-side current.
2. The rectification control method as claimed in claim 1, wherein the process of obtaining the actual inter-harmonic current of the preset frequency in the network side current of the rectifier comprises:
the actual inter-harmonic current with preset frequency in the network side current of the rectifier is obtained through the wave trap.
3. The rectification control method according to claim 2, wherein said preset phase angle offset includes:
a first phase angle offset between the present modulated wave voltage and the actual inter-harmonic current, and/or a second phase angle offset generated by the trap when acquiring the actual inter-harmonic current.
4. The rectification control method according to claim 1, wherein the process of adjusting said present modulated wave voltage in accordance with said corrected inter-harmonic current, comprises:
subtracting the reference inter-harmonic current set value from the corrected inter-harmonic current, and performing closed-loop control to obtain inter-harmonic voltage;
and updating the current modulation wave voltage to be a superposition value of the opposite value of the inter-harmonic voltage and the current modulation wave voltage.
5. The rectification control method according to claim 1, wherein the process of adjusting said present modulated wave voltage in accordance with said corrected inter-harmonic current, comprises:
taking the result of multiplying the corrected inter-harmonic current by a preset proportional coefficient as inter-harmonic voltage;
and updating the current modulation wave voltage to be a superposition value of the opposite value of the inter-harmonic voltage and the current modulation wave voltage.
6. The rectification control method according to claim 1, wherein the process of controlling the rectifier according to the current modulated wave voltage includes:
the carrier frequency of the rectifier is increased from the current carrier frequency to a preset carrier frequency, and the preset carrier frequency is not smaller than the current carrier frequency;
generating expected action time for each switch in the rectifier according to the current modulation wave voltage and the preset carrier frequency;
according to the dead time of the switch in the rectifier and the expected action moment, dead time advance compensation is carried out on the corresponding dead time to obtain the instruction action moment;
and controlling the corresponding switch in the rectifier according to all the command action moments.
7. The rectification control method according to claim 1, further comprising, before controlling the rectifier in accordance with the current modulated wave voltage:
setting the carrier phase shift angle of the rectifiers to be (pi/N+alpha), wherein N is a positive integer, the number of all the rectifiers is represented, and alpha is a preset deviation angle.
8. The rectification control method according to claim 1, further comprising:
filtering the grid-side current through a filtering winding;
the filter winding is a transformer winding on the same side as the rectifier.
9. The method according to claim 1, wherein the step of performing phase angle correction on the actual inter-harmonic current according to a preset phase angle offset to obtain a corrected inter-harmonic current corresponding to a phase angle of a current modulated wave voltage of the rectifier, includes:
and shifting the actual phase angle of the actual inter-harmonic current by a preset phase angle shift amount to obtain a corrected inter-harmonic current corresponding to the phase angle of the current modulation wave voltage of the rectifier.
10. The rectification control method according to any one of claims 1 to 9, characterized by further comprising, before adjusting the present modulated wave voltage in accordance with the corrected inter-harmonic current and controlling the rectifier in accordance with the present modulated wave voltage to reduce the actual inter-harmonic current in the grid-side current:
and determining the current modulation wave voltage through a double closed-loop control strategy according to the actual current, the actual intermediate voltage and the reference intermediate voltage of the rectifier.
11. The method of rectifying control according to claim 10, wherein when the current loop control in said double closed loop control strategy is PI control, a scaling factor of said PI control is a minimum value that reaches a preset response condition.
12. The method according to claim 10, wherein when the current loop control in the dual closed loop control strategy is PR control, the proportionality coefficient is a minimum value reaching a preset response condition, and/or the resonance coefficient is a maximum value reaching the preset response condition, and/or the cutoff frequency is a minimum value reaching the preset response condition, among control parameters of the PR control.
13. A rectification control system, comprising:
the acquisition module is used for acquiring actual inter-harmonic current with preset frequency in network side current of the rectifier;
the correction module is used for carrying out phase angle correction on the actual inter-harmonic current according to a preset phase angle offset to obtain corrected inter-harmonic current corresponding to the phase angle of the current modulation wave voltage of the rectifier;
and the adjusting module is used for adjusting the current modulation wave voltage according to the corrected inter-harmonic current and controlling the rectifier according to the current modulation wave voltage so as to reduce the actual inter-harmonic current in the grid-side current.
14. An electronic device, comprising:
a memory for storing a computer program;
processor for implementing the steps of the rectification control method according to any one of claims 1 to 12 when executing said computer program.
15. A readable storage medium, characterized in that the readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the rectification control method according to any one of claims 1 to 12.
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| CN202310070672.9A CN116202946A (en) | 2023-01-17 | 2023-01-17 | Rectification control method, system, electronic equipment and readable storage medium |
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| CN202310070672.9A CN116202946A (en) | 2023-01-17 | 2023-01-17 | Rectification control method, system, electronic equipment and readable storage medium |
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