CN110707698A - Method, device and equipment for compensating harmonic current and readable storage medium - Google Patents
Method, device and equipment for compensating harmonic current and readable storage medium Download PDFInfo
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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Abstract
The invention relates to a compensation method, a device, equipment and a readable storage medium for harmonic current, the compensation method obtains a reference phase value by phase locking of a power grid voltage, obtains real-time load current in a time domain, carries out harmonic decomposition on the real-time load current according to the reference phase value to obtain each subharmonic current in a rectangular coordinate system, respectively carries out filtering processing on a real part component and an imaginary part component which respectively correspond to each subharmonic current to obtain a corresponding real part component filtering value and an imaginary part component filtering value, respectively carries out correction setting on the amplitude and/or the phase of each subharmonic current according to a preset amplitude threshold value and the corresponding real part component filtering value and imaginary part component filtering value of each subharmonic current to generate each subharmonic given current in the time domain, can carry out filtering processing on each subharmonic to stably convert and track each subharmonic, the defect that compensation and suppression cannot be performed due to system oscillation generated by harmonic compensation tracking lag is overcome.
Description
Technical Field
The present invention relates to the field of power control, and in particular, to a method, an apparatus, a device, and a readable storage medium for compensating a harmonic current.
Background
At present, high-frequency IGBT power supplies are increasingly applied to load heating systems, and high frequency caused by the high-frequency IGBT power supplies is likely to influence a power grid and cause serious harmonic pollution. For example, the switching regulation of the high frequency of the IGBT is further fed back to the grid, which generates fast dynamically varying harmonic currents.
The harmonic current has no obvious influence on the change of the strong power grid, and the voltage stability of the power grid is seriously influenced aiming at the power grid with heavy load and insufficient capacity. For such a high-frequency power supply load, the harmonic current compensation device often generates system oscillation due to the tracking lag of the harmonic compensation, and thus cannot compensate and suppress the harmonic current.
Disclosure of Invention
In view of this, the present invention provides a method, an apparatus, a device, and a readable storage medium for compensating harmonic currents, which can further perform filtering processing on each harmonic to perform smooth conversion and tracking on each harmonic on the basis of decomposing each harmonic current, so as to generate a given current of each harmonic, and overcome the disadvantage that compensation and suppression cannot be performed on the harmonic current due to system oscillation caused by harmonic compensation and tracking lag.
A method of compensating for harmonic currents, the method comprising:
phase locking is carried out on the power grid voltage to obtain a reference phase value;
acquiring real-time load current in a time domain;
carrying out harmonic decomposition on the real-time load current according to the reference phase value to obtain each subharmonic current under a rectangular coordinate system;
respectively filtering the real component and the imaginary component corresponding to each subharmonic current to obtain a corresponding real component filtering value and a corresponding imaginary component filtering value;
and respectively correcting and setting the amplitude and/or the phase of each subharmonic current according to a preset amplitude threshold value and a real part component filtering value and an imaginary part component filtering value which respectively correspond to each subharmonic current so as to generate each subharmonic given current in a time domain.
In one embodiment, the filtering process is performed using at least one of a first order filter, a second order filter, a finite impulse response filter, and an infinite impulse response filter.
In one embodiment, the calculation formula for obtaining each harmonic current in the rectangular coordinate system is as follows:
where ω represents the reference phase value, u (ω t) represents the real-time load current, and the right side of equation (1) represents the harmonic currents of each order contained in the real-time load current u (ω t) in the rectangular coordinate system, a0Representing the zero harmonic component, a1Representing the real component of the fundamental wave, b1Representing the imaginary component of the fundamental wave, anRepresenting the real component of the nth harmonic, bnDenotes the imaginary component of the nth harmonic, t denotes time, and n is a positive integer and is not less than 2.
In one embodiment, the step of performing correction setting on the amplitude and/or the phase of each harmonic current according to a preset amplitude threshold value and a real component filtered value and an imaginary component filtered value respectively corresponding to each harmonic current to generate each harmonic given current in the time domain includes:
converting each subharmonic current into a polar coordinate form according to the real component filtering value and the imaginary component filtering value respectively corresponding to each subharmonic current;
carrying out amplitude limiting on the amplitude of each harmonic current in the polar coordinate form according to a preset amplitude threshold value to generate a corresponding harmonic current correction amplitude; and/or
Correcting and compensating the phase of each subharmonic current in the polar coordinate form to generate a corresponding harmonic current phase correction value;
each harmonic given current in the time domain is obtained according to the harmonic current correction amplitude value and/or the harmonic current phase correction value.
In one embodiment, the compensation method further comprises:
controlling each harmonic given current in a time domain to output respective pulse width modulation signals;
and outputting corresponding harmonic compensation currents according to respective pulse width modulation signals to perform harmonic compensation on the real-time load current, wherein the harmonic compensation currents are equal to the given currents of the corresponding harmonics and opposite in direction.
In addition, a compensation device for harmonic current is provided, the compensation device comprising:
the phase value acquisition module is used for phase-locking the power grid voltage to acquire a reference phase value;
the load current acquisition module is used for acquiring real-time load current in a time domain;
the harmonic decomposition module is used for carrying out harmonic decomposition on the real-time load current according to the reference phase value so as to obtain each harmonic current under a rectangular coordinate system;
the filtering module is used for respectively carrying out filtering processing on the real component and the imaginary component which respectively correspond to each subharmonic current to obtain a real component filtering value and an imaginary component filtering value which respectively correspond to each subharmonic current;
and the given current generation module is used for respectively correcting and setting the amplitude and/or the phase of each harmonic current according to a preset amplitude threshold value and a real component filtered value and an imaginary component filtered value which respectively correspond to each harmonic current so as to generate each harmonic given current in a time domain.
In one embodiment, the filtering module is further configured to perform filtering processing using at least one of a first-order filter, a second-order filter, a finite impulse response filter, and an infinite impulse response filter.
In addition, the compensation equipment of the harmonic current is also provided, and comprises a voltage phase locking unit, a load current detection unit and a harmonic processing and output unit;
the voltage phase locking unit is connected with the harmonic processing and output unit and used for locking the phase of the power grid voltage to obtain a reference phase value and sending the reference phase value to the harmonic processing and output unit;
the load current detection unit is connected with the harmonic processing and output unit and is used for detecting the real-time load current and sending the real-time load current to the harmonic processing and output unit;
the harmonic processing and output unit is used for performing harmonic decomposition on the real-time load current according to the reference phase value to obtain each harmonic current under a rectangular coordinate system, respectively performing filtering processing on a real component and an imaginary component corresponding to each harmonic current to obtain a real component filtering value and an imaginary component filtering value corresponding to each harmonic current, and respectively setting the amplitude and/or the phase of each harmonic current according to a preset amplitude threshold value and the real component filtering value and the imaginary component filtering value corresponding to each harmonic current to generate each harmonic given current in the time domain.
In one embodiment, the harmonic current compensation device further comprises a closed-loop control unit and a power amplification unit;
the closed-loop control unit is respectively connected with the harmonic processing and output unit and the power amplification unit and is used for receiving each harmonic current in the time domain sent by the harmonic processing and output unit, controlling each harmonic given current in the time domain to output respective pulse width modulation signals and sending the signals to the power amplification unit;
the power amplification unit is used for outputting corresponding harmonic compensation currents according to respective pulse width modulation signals so as to perform harmonic compensation on the real-time load current, and the harmonic compensation currents are equal to the given currents of the corresponding harmonics and opposite in direction.
Furthermore, a readable storage medium is provided, which stores a computer program, which when executed by a processor performs the above compensation method.
The harmonic current compensation method, the device, the equipment and the readable storage medium acquire a reference phase value by phase locking a power grid voltage, acquire real-time load current in a time domain, perform harmonic decomposition on the real-time load current according to the reference phase value to acquire each subharmonic current in a rectangular coordinate system, respectively perform filtering processing on a real component and an imaginary component corresponding to each subharmonic current to acquire a real component filtering value and an imaginary component filtering value corresponding to each respective subharmonic current, respectively perform correction setting on the amplitude and/or the phase of each subharmonic current according to a preset amplitude threshold value and the real component filtering value and the imaginary component filtering value corresponding to each subharmonic current to generate each subharmonic given current in the time domain, and further perform filtering processing on each subharmonic to perform stable conversion and tracking on each subharmonic current on the basis of acquiring each subharmonic current by decomposition, and the given current of each harmonic can be generated, and the defect that the harmonic current cannot be compensated and suppressed due to system oscillation caused by harmonic compensation tracking lag is overcome.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
FIG. 1 is a schematic diagram illustrating an exemplary embodiment of a current harmonic compensation method;
FIG. 2 is a schematic flow chart of a method for compensating for current harmonics according to one embodiment;
FIG. 3 is a flow diagram illustrating a method for obtaining a given current for each harmonic in the time domain according to one embodiment;
FIG. 4 is a schematic flow chart illustrating a method for compensating for current harmonics according to another embodiment;
FIG. 5 is a block diagram of a current harmonic compensation apparatus according to an embodiment;
FIG. 6 is a block diagram of a current harmonic compensation apparatus according to an embodiment;
fig. 7 is a block diagram of a current harmonic compensation apparatus according to another embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Various embodiments of the present disclosure will be described more fully hereinafter. The present disclosure is capable of various embodiments and of modifications and variations therein. However, it should be understood that: there is no intention to limit the various embodiments of the disclosure to the specific embodiments disclosed herein, but rather, the disclosure is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the disclosure.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Fig. 1 is a schematic diagram of an application environment of a harmonic current compensation method in an embodiment, including a power grid 110, a power filter 120, and a load 130.
The grid 110 usually adopts a three-phase grid, the power filter 120 usually adopts an active power filter, and the load 130 usually is a high-frequency load, such as an IGBT (IGBT) high-frequency load.
Fig. 2 is a schematic flow chart of a method for compensating a harmonic current in an embodiment, including:
step S210, phase-locking the grid voltage to obtain a reference phase value.
In the phase-locking process for the grid voltage, a conventional phase-locking unit, such as a first-order phase-locked loop or a high-order phase-locked loop, may be used. The three-phase power grid voltage can be realized by adopting a software phase-locked loop, for example, a software phase-locked loop based on a second-order generalized integrator, so as to accurately acquire a corresponding reference phase value.
Of course, the method for phase-locking the grid voltage is not limited to this, and for example, kalman filtering may be used to obtain an accurate reference phase value.
The power filter can phase-lock the grid voltage to acquire a reference phase value.
Step S220, obtain the real-time load current in the time domain.
Among them, the power filter is generally provided with a current transformer device, through which a real-time load current in a time domain can be acquired.
And step S230, performing harmonic decomposition on the real-time load current according to the reference phase value to obtain each harmonic current under the rectangular coordinate system.
After the corresponding reference phase value and the real-time load current are obtained, because the real-time load current usually includes the harmonic current from the load, for example, when the load is an IGBT high-frequency load, the corresponding harmonic current component in the real-time load current is more, on the basis of obtaining the reference phase value, the real-time load current can be subjected to harmonic decomposition by using fourier mathematical transformation, and each subharmonic current under the rectangular coordinate system is obtained.
Step S240, respectively performing filtering processing on the real component and the imaginary component corresponding to each subharmonic current to obtain a real component filtering value and an imaginary component filtering value corresponding to each subharmonic current.
After the harmonic currents of each time in the rectangular coordinate system are obtained, the transient changes of the real component and the imaginary component corresponding to the harmonic currents of each time are likely to be large, and the stable and smooth real component filtering value and the stable and smooth imaginary component filtering value corresponding to the harmonic currents of each time can be obtained by adopting filtering processing, so that the transient oscillation problem generated when the harmonic currents of each time are tracked is avoided.
Step S250, respectively performing correction setting on the amplitude and/or the phase of each subharmonic current according to the preset amplitude threshold and the real component filtered value and the imaginary component filtered value respectively corresponding to each subharmonic current to generate each subharmonic given current in the time domain.
After the real component filtering value and the imaginary component filtering value corresponding to each subharmonic current are obtained, the amplitude of each subharmonic current is usually limited, because the power filter has certain tracking compensation amplitude limit, the too high amplitude exceeds the compensation tracking capability of the power filter, and the power filter cannot track, so that the amplitude of each subharmonic current needs to be corrected according to a preset amplitude threshold value and the corresponding real component filtering value and the corresponding imaginary component filtering value of each subharmonic current.
Similarly, since the obtained reference phase value is generally easy to lag when the grid voltage is phase-locked, the phase needs to be corrected according to the real component filter value and the imaginary component filter value corresponding to each subharmonic current.
Further, according to the corrected amplitude and phase of each harmonic current, a given current of each harmonic current can be obtained.
The harmonic current compensation method comprises the steps of obtaining a reference phase value by phase locking of power grid voltage, obtaining real-time load current in a time domain, carrying out harmonic decomposition on the real-time load current according to the reference phase value to obtain each subharmonic current in a rectangular coordinate system, respectively carrying out filtering processing on a real component and an imaginary component corresponding to each subharmonic current to obtain a real component filtering value and an imaginary component filtering value corresponding to each subharmonic current, respectively correcting and setting the amplitude and/or the phase of each subharmonic current according to a preset amplitude threshold value and the real component filtering value and the imaginary component filtering value corresponding to each subharmonic current to generate each subharmonic given current in the time domain, and further carrying out filtering processing on each subharmonic to stably convert and track each subharmonic current on the basis of obtaining each subharmonic current by decomposition, and the given current of each harmonic can be generated, and the defect that the harmonic current cannot be compensated and suppressed due to system oscillation caused by harmonic compensation tracking lag is overcome.
In one embodiment, the filtering process is performed using at least one of a first order filter, a second order filter, a finite impulse response filter, and an infinite impulse response filter.
Wherein, when a first order filter is used, Yn＝aXn+(1-a)Yn-1，XnRepresenting the present sample value, a representing the filter coefficient, YnIndicating the output value of this filtering, Yn-1Representing the previous filtering output, in a digital system, the execution is performed at sampling T intervals, and the cutoff frequency is calculated by the formula
Where a fast processor may be used, the sampling rate is typically set to 100kHz, so setting the filter coefficient a sets the cut-off frequency.
In order to facilitate the final debugging of different systems, the filter coefficient a can be used as a settable parameter, different sites, different systems and different times of harmonic waves can be set independently, and the adaptability is stronger, so that a better filtering effect is obtained.
In one embodiment, the calculation formula for obtaining each harmonic current in the rectangular coordinate system is as follows:
where ω represents the reference phase value, u (ω t) represents the real-time load current, and the right side of equation (1) represents the harmonic currents of each order contained in the real-time load current u (ω t) in the rectangular coordinate system, a0Representing the zero harmonic component, a1Representing the real component of the fundamental wave, b1Representing the imaginary component of the fundamental wave, anRepresenting the real component of the nth harmonic, bnDenotes the imaginary component of the nth harmonic, t denotes time, and n is a positive integer and is not less than 2.
The calculation formula adopts an FFT algorithm, and can be decomposed to obtain each harmonic current in an angular coordinate system.
In one embodiment, as shown in fig. 3, step S250 includes:
step S252, converting each subharmonic current into a polar form according to the real component filtered value and the imaginary component filtered value respectively corresponding to each subharmonic current.
Wherein is not provided with
Representing the filtered value of the real component corresponding to the nth harmonic,
the imaginary component filter value corresponding to n-th harmonic is expressed, so that the polar coordinate form of each harmonic current is obtained
Wherein n is greater than or equal to 2 and belongs to a positive integer, and the calculation formula is as follows:
and step S254, according to a preset amplitude threshold, performing amplitude limiting on the amplitude of each harmonic current in the polar coordinate form to generate a corresponding harmonic current correction amplitude, and/or performing correction compensation on the phase of each harmonic current in the polar coordinate form to generate a corresponding harmonic current phase correction value.
Wherein, the aboveThe amplitude of the harmonic current is limited according to a preset amplitude threshold value when the amplitude of the harmonic current exceeds the preset amplitude threshold value, and the amplitude of the harmonic current is based on the amplitude of the harmonic current when the amplitude of the harmonic current does not exceed the preset amplitude threshold value.
Similarly, the phase of each harmonic current in polar coordinate form
Correction compensation is performed to generate corresponding harmonic current phase correction values.
Generally, in the actual tracking compensation process, the amplitude and phase of each harmonic current need to be calibrated at the same time.
And step S256, obtaining each harmonic given current in the time domain according to the harmonic current correction amplitude value and/or the harmonic current phase correction value.
The electric filter converts each harmonic current in a polar coordinate form after correction processing into each harmonic given current in a time domain on the basis of obtaining the harmonic current correction amplitude and/or the harmonic current phase correction value.
In one embodiment, as shown in fig. 4, the compensation method further includes:
in step S260, the harmonic given currents in the time domain are controlled to output respective pwm signals.
After generating the harmonic given current in the time domain, the power filter needs to further control and output the pulse width modulation signal according to the harmonic given current in the time domain.
Wherein, the control process can adopt repeated control.
Step S270, outputting corresponding harmonic compensation currents according to the respective pwm signals to perform harmonic compensation on the real-time load current, where the harmonic compensation currents are equal to and opposite to the respective harmonic given currents.
The harmonic compensation current can perform harmonic compensation on the real-time load current to reduce the harmonic current in the circuit.
Furthermore, as shown in fig. 5, there is provided a compensation apparatus 300 for harmonic current, the compensation apparatus 300 comprising:
a phase value obtaining module 310, configured to phase-lock the grid voltage to obtain a reference phase value;
a load current obtaining module 320, configured to obtain a real-time load current in a time domain;
the harmonic decomposition module 330 is configured to perform harmonic decomposition on the real-time load current according to the reference phase value to obtain each harmonic current in the rectangular coordinate system;
the filtering module 340 is configured to perform filtering processing on the real component and the imaginary component respectively corresponding to each sub-harmonic current to obtain a real component filtering value and an imaginary component filtering value respectively corresponding to each sub-harmonic current;
the given current generating module 350 is configured to correct and set the amplitude and/or the phase of each harmonic current according to a preset amplitude threshold and the real component filtered value and the imaginary component filtered value respectively corresponding to each harmonic current to generate each harmonic given current in the time domain.
In one embodiment, the filtering module 340 is further configured to perform filtering processing using at least one of a first-order filter, a second-order filter, a finite impulse response filter, and an infinite impulse response filter.
In addition, as shown in fig. 6, a harmonic current compensation apparatus 400 is further provided, where the compensation apparatus 400 includes a voltage phase locking unit 410, a load current detection unit 420, and a harmonic processing and output unit 430;
the voltage phase locking unit 410 is connected to the harmonic processing and output unit 430, and is configured to perform phase locking on the grid voltage to obtain a reference phase value, and send the reference phase value to the harmonic processing and output unit 430;
the load current detection unit 420 is connected with the harmonic processing and output unit 430, and is configured to detect a real-time load current and send the real-time load current to the harmonic processing and output unit 430;
the harmonic processing and output unit 430 is configured to perform harmonic decomposition on the real-time load current according to the reference phase value to obtain each subharmonic current in the rectangular coordinate system, perform filtering processing on the real component and the imaginary component respectively corresponding to each subharmonic current to obtain a corresponding real component filtered value and an imaginary component filtered value, and set the amplitude and/or the phase of each subharmonic current according to a preset amplitude threshold and the corresponding real component filtered value and imaginary component filtered value of each subharmonic current to generate each subharmonic given current in the time domain.
In one embodiment, as shown in fig. 7, a harmonic current compensation device 500 is provided, the harmonic current compensation device 500 further comprising a closed loop control unit 440 and a power amplification unit 450.
The closed-loop control unit 440 is connected to the harmonic processing and output unit 430 and the power amplification unit 450, and configured to receive each harmonic current in the time domain sent by the harmonic processing and output unit 430, and control each harmonic given current in the time domain to output a respective pulse width modulation signal and send the signal to the power amplification unit 450.
The power amplifying unit 450 is configured to output each harmonic compensation current according to the respective pwm signal to perform harmonic compensation on the real-time load current, where each harmonic compensation current is equal to and opposite to each harmonic given current.
Furthermore, a readable storage medium is provided, which stores a computer program, which when executed by a processor performs the above compensation method.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that contributes to the prior art in essence can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A method of compensating for harmonic currents, the method comprising:
phase locking is carried out on the power grid voltage to obtain a reference phase value;
acquiring real-time load current in a time domain;
carrying out harmonic decomposition on the real-time load current according to the reference phase value to obtain each subharmonic current under a rectangular coordinate system;
respectively filtering the real component and the imaginary component corresponding to each subharmonic current to obtain a corresponding real component filtering value and a corresponding imaginary component filtering value;
and respectively correcting and setting the amplitude and/or the phase of each subharmonic current according to a preset amplitude threshold value and a real part component filtering value and an imaginary part component filtering value which respectively correspond to each subharmonic current so as to generate each subharmonic given current in a time domain.
2. The compensation method of claim 1, wherein the filtering process is performed using at least one of a first-order filter, a second-order filter, a finite impulse response filter, and an infinite impulse response filter.
3. The compensation method according to claim 1, wherein the calculation formula for obtaining each harmonic current in the rectangular coordinate system is:
where ω represents the reference phase value, u (ω t) represents the real-time load current, and the right side of equation (1) represents the harmonic currents of each order contained in the real-time load current u (ω t) in the rectangular coordinate system, a0Representing the zero harmonic component, a1Representing the real component of the fundamental wave, b1Representing the imaginary component of the fundamental wave, anRepresenting the real component of the nth harmonic, bnDenotes the imaginary component of the nth harmonic, t denotes time, and n is a positive integer and is not less than 2.
4. The compensation method as claimed in claim 1, wherein the step of performing correction setting on the amplitude and/or phase of each harmonic current according to the preset amplitude threshold value and the real component filtered value and the imaginary component filtered value respectively corresponding to each harmonic current to generate each harmonic given current in the time domain comprises:
converting each subharmonic current into a polar coordinate form according to the real component filtering value and the imaginary component filtering value respectively corresponding to each subharmonic current;
carrying out amplitude limiting on the amplitude of each harmonic current in the polar coordinate form according to a preset amplitude threshold value to generate a corresponding harmonic current correction amplitude; and/or
Correcting and compensating the phase of each harmonic current in the polar coordinate form to generate a corresponding harmonic current phase correction value;
and obtaining each harmonic given current in a time domain according to the harmonic current correction amplitude and/or the harmonic current phase correction value.
5. The compensation method of claim 1, further comprising:
controlling each harmonic given current in the time domain to output respective pulse width modulation signals;
and outputting corresponding harmonic compensation currents according to respective pulse width modulation signals to perform harmonic compensation on the real-time load current, wherein the harmonic compensation currents are equal to the given currents of the corresponding harmonics and opposite in direction.
6. A compensation arrangement for harmonic currents, the compensation arrangement comprising:
the phase value acquisition module is used for phase-locking the power grid voltage to acquire a reference phase value;
the load current acquisition module is used for acquiring real-time load current in a time domain;
the harmonic decomposition module is used for carrying out harmonic decomposition on the real-time load current according to the reference phase value so as to obtain each harmonic current under a rectangular coordinate system;
the filtering module is used for respectively carrying out filtering processing on the real component and the imaginary component which respectively correspond to each subharmonic current to obtain a real component filtering value and an imaginary component filtering value which respectively correspond to each subharmonic current;
and the given current generation module is used for respectively correcting and setting the amplitude and/or the phase of each harmonic current according to a preset amplitude threshold value and a real component filtered value and an imaginary component filtered value which respectively correspond to each harmonic current so as to generate each harmonic given current in a time domain.
7. The compensation apparatus of claim 6, wherein the filtering module is further configured to perform the filtering process using at least one of a first-order filter, a second-order filter, a finite impulse response filter, and an infinite impulse response filter.
8. The compensation equipment of harmonic current is characterized by comprising a voltage phase locking unit, a load current detection unit and a harmonic processing and output unit;
the voltage phase locking unit is connected with the harmonic processing and output unit and is used for performing phase locking on the power grid voltage to obtain a reference phase value and sending the reference phase value to the harmonic processing and output unit;
the load current detection unit is connected with the harmonic processing and output unit and is used for detecting real-time load current and sending the real-time load current to the harmonic processing and output unit;
the harmonic processing and output unit is used for performing harmonic decomposition on the real-time load current according to the reference phase value to obtain each subharmonic current under a rectangular coordinate system, respectively performing filtering processing on a real component and an imaginary component corresponding to each subharmonic current to obtain a real component filtering value and an imaginary component filtering value corresponding to each subharmonic current, and respectively setting the amplitude and/or the phase of each subharmonic current according to a preset amplitude threshold value and the real component filtering value and the imaginary component filtering value corresponding to each subharmonic current to generate each subharmonic given current in a time domain.
9. The compensation apparatus of claim 8, further comprising a closed loop control unit and a power amplification unit;
the closed-loop control unit is respectively connected with the harmonic processing and output unit and the power amplification unit and is used for receiving each harmonic current in the time domain sent by the harmonic processing and output unit, controlling each harmonic given current in the time domain to output respective pulse width modulation signals and sending the signals to the power amplification unit;
the power amplification unit is used for outputting corresponding harmonic compensation currents according to respective pulse width modulation signals so as to perform harmonic compensation on the real-time load current, and the harmonic compensation currents are equal to the harmonic given currents and opposite in direction to the harmonic given currents.
10. A readable storage medium, characterized in that the readable storage medium stores a computer program which, when executed by a processor, implements the compensation method of any one of claims 1 to 5.
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