CN116526813A - Method and system for inhibiting third harmonic of input current of single-phase bridge rectifier - Google Patents
Method and system for inhibiting third harmonic of input current of single-phase bridge rectifier Download PDFInfo
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- CN116526813A CN116526813A CN202310373726.9A CN202310373726A CN116526813A CN 116526813 A CN116526813 A CN 116526813A CN 202310373726 A CN202310373726 A CN 202310373726A CN 116526813 A CN116526813 A CN 116526813A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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Abstract
The invention discloses a method and a system for inhibiting third harmonic of input current of a single-phase bridge rectifier, wherein the method comprises the following steps: collecting voltage real-time value u of power grid s And calculates the voltage amplitude U sm The method comprises the steps of carrying out a first treatment on the surface of the Based on the electric compacting time value u s Acquiring a voltage vector angle theta of a power grid through a phase-locked loop; generating a cosine signal cos theta based on the voltage vector angle theta; output direct-current voltage command U based on preset dc * Obtaining an active current instruction I of the power grid through a voltage outer loop control loop sd * The method comprises the steps of carrying out a first treatment on the surface of the Based on voltage amplitude U sm Cosine signal cos theta and power grid active current command I sd * Predicting power fluctuation of a power grid; based on the predicted power fluctuation of the power grid, predicting voltage ripple in the output voltage by combining hardware parameters of the single-phase PWM rectifier; output voltage compacting value U for superimposing voltage ripple to control system dc Through electricityPressing the outer ring to obtain an active value instruction I of the power grid current sd * The method comprises the steps of carrying out a first treatment on the surface of the Instruction I based on power grid current active value sd * The third harmonic of the input current of the single-phase PWM rectifier is suppressed.
Description
Technical Field
The invention relates to the technical field of single-phase Pulse Width Modulation (PWM) rectifiers, in particular to a method and a system for suppressing third harmonic of input current of a single-phase bridge rectifier.
Background
Single phase pulse width modulated PWM rectifiers are a relatively common AC-DC conversion topology. The power factor is controllable, and the bidirectional flow of energy can be realized; the sine degree of the input current of the power grid is high, and the harmonic wave is small; the output bus voltage is controllable. The method is widely applied to the front-stage rectification of various medium and small power AC-DC-DC power supplies, and has very wide application in the fields of communication power supplies, superconducting energy storage, uninterruptible power supplies and special power supplies.
Because the single-phase input power has periodic pulsation of twice power frequency, the output direct-current voltage inevitably has corresponding twice power frequency ripple components, and after the twice power frequency ripple is introduced into a control system, the distortion of the current waveform of a power grid can be finally caused, larger third harmonic wave appears, the total harmonic distortion of the current is increased, and the power quality of the power grid is influenced.
In order to reduce the effect of the output voltage ripple on the grid current, it is conventional to introduce a low pass filter in the feedback loop, but this reduces the bandwidth of the system, affecting the response speed of the converter. Therefore, a technique is needed to achieve suppression of the third harmonic of the input current of a single phase bridge rectifier.
Disclosure of Invention
The technical scheme of the invention provides a method and a system for suppressing the third harmonic of the input current of a single-phase bridge rectifier, which are used for solving the problem of how to suppress the third harmonic of the input current of the single-phase bridge rectifier.
In order to solve the above problems, the present invention provides a method for suppressing third harmonic of input current of a single-phase bridge rectifier, the method comprising:
collecting voltage real-time value u of power grid s And calculates the voltage amplitude U sm ；
Based on the voltage real-time value u s Acquiring a voltage vector angle theta of a power grid through a phase-locked loop; generating a cosine signal cos theta based on the voltage vector angle theta;
output direct-current voltage command U based on preset dc * Obtaining an active current instruction I of the power grid through a voltage outer loop control loop sd * The method comprises the steps of carrying out a first treatment on the surface of the Based on the voltage amplitude U sm The cosine signal cos theta and the power grid active current command I sd * Predicting power fluctuation of a power grid;
based on the predicted power fluctuation of the power grid, predicting voltage ripple in the output voltage by combining hardware parameters of the single-phase Pulse Width Modulation (PWM) rectifier;
output voltage compacting value U for superposing said voltage ripple to control system dc Obtaining a power grid current active value instruction I through a voltage outer ring sd * The method comprises the steps of carrying out a first treatment on the surface of the Instruction I based on the power grid current active value sd * The third harmonic of the input current of the single-phase Pulse Width Modulation (PWM) rectifier is suppressed.
Preferably, the real-time value u based on the voltage s Obtaining, by a phase-locked loop, a vector angle θ of a grid voltage, comprising:
compacting the electric current value u s Mapping to a two-phase stationary coordinate system to obtain u sα Compacting the electric current value u s Delay by 90 ° to obtain u sβ Will u sα 、u sβ U of two-phase rotation coordinate system is obtained by coordinate transformation sd 、u sq The method comprises the steps of carrying out a first treatment on the surface of the U is controlled by a control system sq The vector angle θ of the grid voltage is obtained by integration, controlled to 0, plus a speed feed forward of 314 rad/s.
Preferably, the predicted grid power fluctuations are:
wherein p is s For real-time power of the grid, θ=ωt, ω is the grid voltage angular frequency, t is time, Δp s Is a fluctuating component of power.
Preferably, the voltage ripple in the predicted output voltage is:
wherein θ=ωt, ω is the grid voltage angular frequency, t is the time, U dc * And C is the output filter capacitor of the single-phase Pulse Width Modulation (PWM) rectifier for outputting the voltage command value.
Preferably, the grid current active value command I sd * The method comprises the following steps:
wherein K is p ，K i Is the parameter of the PI controller, s is the Laplacian, U dc * Is a direct-current voltage command, U dc For outputting the real-time sampling value of the voltage, deltau dc Is the predicted voltage ripple.
Based on another aspect of the present invention, the present invention provides a single phase bridge rectifier input current third harmonic suppression system, the system comprising:
an initial unit for collecting the voltage real-time value u of the power grid s And calculates the voltage amplitude U sm ；
An execution unit for based on the voltage real-time value u s Acquiring a voltage vector angle theta of a power grid through a phase-locked loop; generating a cosine signal cos theta based on the voltage vector angle theta; output direct-current voltage command U based on preset dc * Obtaining an active current instruction I of the power grid through a voltage outer loop control loop sd * The method comprises the steps of carrying out a first treatment on the surface of the Based on the voltage amplitude U sm The cosine signal cos theta and the power grid active current command I sd * Predicting power fluctuation of a power grid; based on the predicted power fluctuation of the power grid, predicting voltage ripple in the output voltage by combining hardware parameters of the single-phase Pulse Width Modulation (PWM) rectifier;
a result unit for superimposing said voltage ripple to an output electric compacting value U of the control system dc Obtaining a power grid current active value instruction I through a voltage outer ring sd * The method comprises the steps of carrying out a first treatment on the surface of the Instruction I based on the power grid current active value sd * The third harmonic of the input current of the single-phase Pulse Width Modulation (PWM) rectifier is suppressed.
Preferably, the execution unit is used for based on the voltage real-time value u s Obtaining, by a phase-locked loop, a vector angle θ of a grid voltage, comprising:
compacting the electric current value u s Mapping to a two-phase stationary coordinate system to obtain u sα Compacting the electric current value u s Delay by 90 ° to obtain u sβ Will u sα 、u sβ U of two-phase rotation coordinate system is obtained by coordinate transformation sd 、u sq The method comprises the steps of carrying out a first treatment on the surface of the U is controlled by a control system sq The vector angle θ of the grid voltage is obtained by integration, controlled to 0, plus a speed feed forward of 314 rad/s.
Preferably, the predicted grid power fluctuations are:
wherein p is s For real-time power of the grid, θ=ωt, ω is the grid voltage angular frequency, t is time, Δp s Is a fluctuating component of power.
Preferably, the voltage ripple in the predicted output voltage is:
wherein θ=ωt, ω is the grid voltage angular frequency, t is the time, U dc * And C is the output filter capacitor of the single-phase Pulse Width Modulation (PWM) rectifier for outputting the voltage command value.
Preferably, the grid current active value command I sd * The method comprises the following steps:
wherein K is p ，K i Is the parameter of the PI controller, s is the Laplacian, U dc * Is a direct-current voltage command, U dc For outputting the real-time sampling value of the voltage, deltau dc Is the predicted voltage ripple.
The invention provides a computer readable storage medium, which stores a computer program for executing the method for suppressing the third harmonic of the input current of the single-phase bridge rectifier.
The present invention provides an electronic device, including: a processor and a memory; wherein,,
a memory for storing processor-executable instructions;
and the processor is used for reading the executable instructions from the memory and executing the instructions to realize the method for suppressing the third harmonic of the input current of the single-phase bridge rectifier.
The technical scheme of the invention provides a method and a system for inhibiting third harmonic of input current of a single-phase bridge rectifier, wherein the method comprises the following steps: collecting voltage real-time value u of power grid s And calculates the voltage amplitude U sm The method comprises the steps of carrying out a first treatment on the surface of the Based on the electric compacting time value u s Acquiring a voltage vector angle theta of a power grid through a phase-locked loop; generating a cosine signal cos theta based on the voltage vector angle theta; output direct-current voltage command U based on preset dc * Obtaining an active current instruction I of the power grid through a voltage outer loop control loop sd * The method comprises the steps of carrying out a first treatment on the surface of the Based on voltage amplitude U sm Cosine signal cos theta and power grid active current command I sd * Predicting power fluctuation of a power grid; based on the predicted power fluctuation of the power grid, predicting voltage ripple in the output voltage by combining hardware parameters of the single-phase Pulse Width Modulation (PWM) rectifier; output voltage compacting value U for superimposing voltage ripple to control system dc Obtaining a power grid current active value instruction I through a voltage outer ring sd * The method comprises the steps of carrying out a first treatment on the surface of the Instruction I based on power grid current active value sd * The third harmonic of the input current of the single-phase Pulse Width Modulation (PWM) rectifier is suppressed. According to the technical scheme, an output current sensor does not need to be newly added, only the existing data is used for optimizing from the algorithm, the hardware cost is not increased, the method is applicable to different load conditions, and the effective suppression of the third harmonic of the power grid current is realized.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a flow chart of a method for suppressing third harmonic of input current of a single-phase bridge rectifier according to a preferred embodiment of the invention;
FIG. 2 is a flow chart of a method for suppressing third harmonic of input current of a single-phase bridge rectifier according to a preferred embodiment of the invention;
FIG. 3 is a main circuit topology provided by a method for suppressing third harmonic of input current of a single-phase high frequency pulse width modulation PWM rectifier according to a preferred embodiment of the present invention;
FIG. 4 is a voltage-current control block diagram provided by a method for suppressing third harmonic of input current of a single-phase high-frequency pulse width modulation PWM rectifier according to a preferred embodiment of the present invention;
fig. 5 is a grid input current THD according to a preferred embodiment of the present invention not in use;
fig. 6 is a grid input current THD according to a preferred embodiment of the present invention;
fig. 7 is a block diagram of a single phase bridge rectifier input current third harmonic rejection system in accordance with a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a method for suppressing third harmonic of input current of a single-phase bridge rectifier according to a preferred embodiment of the invention. Aiming at the defects and improvement requirements of the prior art, the invention provides a method for inhibiting the third harmonic of the input current of a single-phase high-frequency Pulse Width Modulation (PWM) rectifier, which improves the influence of double power frequency ripple of the output direct-current voltage on the input side grid current and simultaneously solves the problem of slow response speed of a system caused by the scheme of adding a low-pass filter in a control loop. The present invention performs current third harmonic suppression based on fig. 3.
As shown in fig. 1, the present invention provides a method for suppressing third harmonic of input current of a single-phase bridge rectifier, which includes:
step 101: collecting voltage real-time value u of power grid s And calculates the voltage amplitude U sm ；
The invention proceeds from step 101: and acquiring a voltage and current real-time value of the power grid to obtain amplitude and phase information of the power grid. The voltage and current information of the power grid side is acquired through a sensor, and the voltage real-time value u is calculated s Current real time value i s And calculates the effective value U of the power grid voltage s Effective value of current I s Voltage amplitude U sm Current amplitude I sm 。
Step 102: based on the electric compacting time value u s Acquiring a voltage vector angle theta of a power grid through a phase-locked loop; generating a cosine signal cos theta based on the voltage vector angle theta;
preferably, the value u is based on the electric compaction s Obtaining, by a phase-locked loop, a vector angle θ of a grid voltage, comprising:
compacting the electric current value u s Mapping to a two-phase stationary coordinate system to obtain u sα Compacting the electric current value u s Delay by 90 ° to obtain u sβ Will u sα 、u sβ U of two-phase rotation coordinate system is obtained by coordinate transformation sd 、u sq The method comprises the steps of carrying out a first treatment on the surface of the U is controlled by a control system sq The vector angle θ of the grid voltage is obtained by integration, controlled to 0, plus a speed feed forward of 314 rad/s.
The invention in step 102 obtains the voltage real-time value u according to step 101 s And acquiring a vector angle theta of the power grid voltage by using a phase-locked loop, and generating a group of sine and cosine signals sin theta and cos theta.
The invention compresses the value u in step 102 s Mapping to a two-phase stationary coordinate system to obtain u sα Compacting the electric current value u s Delay by 90 ° to obtain u sβ Will u sα 、u sβ U of two-phase rotation coordinate system is obtained by coordinate transformation sd 、u sq . U is controlled by a control system sq Controlled to 0 plus 314radAnd (3) feeding forward the speed of/s, and integrating to obtain a grid voltage vector angle theta.
Step 103: output direct-current voltage command U based on preset dc * Obtaining an active current instruction I of the power grid through a voltage outer loop control loop sd * The method comprises the steps of carrying out a first treatment on the surface of the Based on voltage amplitude U sm Cosine signal cos theta and power grid active current command I sd * Predicting power fluctuation of a power grid;
preferably, the predicted grid power fluctuations are:
wherein p is s For real-time power of the grid, θ=ωt, ω is the grid voltage angular frequency, t is time, Δp s Is a fluctuating component of power.
The invention is based on cos theta of step 102 and U in S1 at step 103 sm Obtaining a power grid voltage compacting time value U sm cos θ; according to a given output DC voltage command U dc * Obtaining an active current instruction I of the power grid through a voltage outer loop control loop sd * And obtain predicted grid current real-time value I sd * cos θ, and predicts the power fluctuation of the grid.
The invention uses the grid-charged compacting value U in step 103 sm cos theta is a calculated value calculated according to the effective value of the grid voltage and the vector angle theta, and is not a real-time value sampled by the grid voltage sensor.
The power grid power expression predicted by the invention is as follows:
wherein p is s For real-time power of the electric network, U sm For the amplitude of the network voltage, I sd * For the current loop command, θ is the grid voltage vector angle, θ=ωt, ω is the grid voltage angular frequency.
Step 104: based on the predicted power fluctuation of the power grid, predicting voltage ripple in the output voltage by combining hardware parameters of the single-phase Pulse Width Modulation (PWM) rectifier;
preferably, the voltage ripple in the predicted output voltage is:
wherein θ=ωt, ω is the grid voltage angular frequency, t is the time, U dc * And C is the output filter capacitor of the single-phase Pulse Width Modulation (PWM) rectifier for outputting the voltage command value.
In step 104, the present invention predicts the amplitude and phase of the double power frequency ripple wave that will be contained in the output voltage according to the power fluctuation of the power grid predicted in step 103, in combination with the hardware parameters of the single-phase pulse width modulation PWM rectifier.
In step 103 of the present invention, the current information used for predicting the power fluctuation of the power grid is a direct current voltage command U dc * Active current command I obtained through control loop sd * Not the real-time value sampled by the grid current sensor, and only for the operating conditions of unity power factor.
The output voltage ripple expression predicted by the invention is:
wherein U is sm For the amplitude of the network voltage, I sd * For the current loop instruction, θ is the vector angle of the grid voltage, θ=ωt, ω is the angular frequency of the grid voltage, U dc * And C is the output filter capacitor of the single-phase Pulse Width Modulation (PWM) rectifier for outputting the voltage command value. By U-shaped dc * Rather than the output voltage real-time sampling value U dc Calculation to avoid introducing ripple in the output voltage into the control system.
Step 105: superimposed on voltage rippleOutput of the electric compacting value U to the control system dc Obtaining a power grid current active value instruction I through a voltage outer ring sd * The method comprises the steps of carrying out a first treatment on the surface of the Instruction I based on power grid current active value sd * The third harmonic of the input current of the single-phase Pulse Width Modulation (PWM) rectifier is suppressed.
Preferably, the grid current active value command I sd * The method comprises the following steps:
wherein K is p ，K i Is the parameter of the PI controller, s is the Laplacian, U dc * Is a direct-current voltage command, U dc For outputting the real-time sampling value of the voltage, deltau dc Is the predicted voltage ripple.
In step 105, the output voltage ripple predicted by 104 is inverted and superimposed on the output voltage compacting value U of the injection control system dc Obtaining a power grid current active value instruction I through a voltage outer ring sd * And suppressing the influence caused by twice power frequency ripple in the output voltage, suppressing the third harmonic of the current at the power grid side, and obtaining a final spwm signal through PI control and coordinate transformation. As shown in fig. 4.
The ripple in the output voltage in step 104 of the present invention is a predicted value predicted based on the grid-side power fluctuation and is not a real-time value sampled by the output voltage sensor.
The output voltage ripple predicted in step 105 of the present invention is inverted and superimposed on the output voltage compact value of the injection control system, without passing through a low pass filter, thereby ensuring the response speed of the system.
The power grid current active value instruction expression is as follows:
wherein K is p ，K i Is PI (proportional integral)Parameters of the controller, s is Laplacian, U dc * Is a direct-current voltage command, U dc For outputting the real-time sampling value of the voltage, deltau dc Is the predicted output voltage ripple.
The invention provides a method for suppressing third harmonic of input current of a single-phase high-frequency Pulse Width Modulation (PWM) rectifier, which predicts the ripple condition of direct current output voltage by predicting power fluctuation of a power grid, superimposes the ripple condition on an output voltage compacting value acquired by a sensor, sends the output voltage compacting value into a control system together, suppresses the influence of the output voltage compacting wave on the control system, and obtains an active current component instruction value I through PI control sd * The third harmonic of the input current of the single-phase high-frequency pulse width modulation PWM rectifier is restrained. The invention does not depend on a low-pass filter to attenuate the output direct-current ripple, does not influence the bandwidth of a system, does not need to add an output current sensor, only starts from the existing data, optimizes from the algorithm, does not increase the hardware cost, is suitable for different load conditions, and realizes the effective suppression of the third harmonic of the power grid current.
The invention provides a method for inhibiting the third harmonic of input current of a single-phase high-frequency Pulse Width Modulation (PWM) rectifier, wherein the third harmonic of the input current can be reduced by 80%;
the invention provides a harmonic prediction method, which uses instruction values instead of actual sampling values to calculate during prediction, thereby avoiding the influence of harmonic components in actual parameters.
The invention provides a computer readable storage medium, which stores a computer program for executing the method for suppressing the third harmonic of the input current of the single-phase bridge rectifier.
The present invention provides an electronic device, including: a processor and a memory; wherein,,
a memory for storing processor-executable instructions;
and the processor is used for reading the executable instructions from the memory and executing the instructions to realize the method for suppressing the third harmonic of the input current of the single-phase bridge rectifier.
Fig. 7 is a block diagram of a single phase bridge rectifier input current third harmonic rejection system in accordance with a preferred embodiment of the present invention.
As shown in fig. 7, the present invention provides a single phase bridge rectifier input current third harmonic suppression system, the system comprising:
an initial unit 701 for collecting a voltage real-time value u of the power grid s And calculates the voltage amplitude U sm ；
An execution unit 702 for real-time value u based on the voltage s Acquiring a voltage vector angle theta of a power grid through a phase-locked loop; generating a cosine signal cos theta based on the voltage vector angle theta; output direct-current voltage command U based on preset dc * Obtaining an active current instruction I of the power grid through a voltage outer loop control loop sd * The method comprises the steps of carrying out a first treatment on the surface of the Based on the voltage amplitude U sm The cosine signal cos theta and the power grid active current command I sd * Predicting power fluctuation of a power grid; based on the predicted power fluctuation of the power grid, predicting voltage ripple in the output voltage by combining hardware parameters of the single-phase Pulse Width Modulation (PWM) rectifier;
preferably, the predicted grid power fluctuations are:
wherein p is s For real-time power of the grid, θ=ωt, ω is the grid voltage angular frequency, t is time, Δp s Is a fluctuating component of power.
Preferably, the voltage ripple in the predicted output voltage is:
wherein θ=ωt, ω is the grid voltage angular frequency, t is the time, U dc * For outputting the voltage command value, C is single-phase pulse width modulation PWMThe output of the rectifier filters the capacitance.
Preferably, the grid current active value command I sd * The method comprises the following steps:
wherein K is p ，K i Is the parameter of the PI controller, s is the Laplacian, U dc * Is a direct-current voltage command, U dc For outputting the real-time sampling value of the voltage, deltau dc Is the predicted voltage ripple.
A result unit 703 for superimposing said voltage ripple to an output electric compacting value U of the control system dc Obtaining a power grid current active value instruction I through a voltage outer ring sd * The method comprises the steps of carrying out a first treatment on the surface of the Instruction I based on the power grid current active value sd * The third harmonic of the input current of the single-phase Pulse Width Modulation (PWM) rectifier is suppressed.
Preferably, the execution unit 702 is configured to, based on the voltage real-time value u s Obtaining, by a phase-locked loop, a vector angle θ of a grid voltage, comprising:
compacting the electric current value u s Mapping to a two-phase stationary coordinate system to obtain u sα Compacting the electric current value u s Delay by 90 ° to obtain u sβ Will u sα 、u sβ U of two-phase rotation coordinate system is obtained by coordinate transformation sd 、u sq The method comprises the steps of carrying out a first treatment on the surface of the U is controlled by a control system sq The vector angle θ of the grid voltage is obtained by integration, controlled to 0, plus a speed feed forward of 314 rad/s.
The invention provides a system for suppressing the third harmonic of the input current of a single-phase bridge rectifier, which corresponds to the method for suppressing the third harmonic of the input current of the single-phase bridge rectifier, and is not described herein.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (12)
1. A method of single phase bridge rectifier input current third harmonic rejection, the method comprising:
collecting voltage real-time value u of power grid s And calculates the voltage amplitude U sm ；
Based on the voltage real-time value u s Acquiring a voltage vector angle theta of a power grid through a phase-locked loop; generating a cosine signal cos theta based on the voltage vector angle theta;
output direct-current voltage command U based on preset dc * Obtaining an active current instruction I of the power grid through a voltage outer loop control loop sd * The method comprises the steps of carrying out a first treatment on the surface of the Based on the voltage amplitude U sm Said remainderChord signal cos theta and active current instruction I of power grid sd * Predicting power fluctuation of a power grid;
based on the predicted power fluctuation of the power grid, predicting voltage ripple in the output voltage by combining hardware parameters of the single-phase Pulse Width Modulation (PWM) rectifier;
output voltage compacting value U for superposing said voltage ripple to control system dc Obtaining a power grid current active value instruction I through a voltage outer ring sd * The method comprises the steps of carrying out a first treatment on the surface of the Instruction I based on the power grid current active value sd * The third harmonic of the input current of the single-phase Pulse Width Modulation (PWM) rectifier is suppressed.
2. The method according to claim 1, said based on said voltage real-time value u s Obtaining, by a phase-locked loop, a vector angle θ of a grid voltage, comprising:
compacting the electric current value u s Mapping to a two-phase stationary coordinate system to obtain u sα Compacting the electric current value u s Delay by 90 ° to obtain u sβ Will u sα 、u sβ U of two-phase rotation coordinate system is obtained by coordinate transformation sd 、u sq The method comprises the steps of carrying out a first treatment on the surface of the U is controlled by a control system sq The vector angle θ of the grid voltage is obtained by integration, controlled to 0, plus a speed feed forward of 314 rad/s.
3. The method of claim 1, the predicted grid power fluctuations being:
wherein p is s For real-time power of the grid, θ=ωt, ω is the grid voltage angular frequency, t is time, Δp s Is a fluctuating component of power.
4. The method of claim 1, predicting a voltage ripple in an output voltage as:
wherein θ=ωt, ω is the grid voltage angular frequency, t is the time, U dc * And C is the output filter capacitor of the single-phase Pulse Width Modulation (PWM) rectifier for outputting the voltage command value.
5. The method of claim 1, the grid current active value command I sd * The method comprises the following steps:
wherein K is p ，K i Is the parameter of the PI controller, s is the Laplacian, U dc * Is a direct-current voltage command, U dc For outputting the real-time sampling value of the voltage, deltau dc Is the predicted voltage ripple.
6. A single phase bridge rectifier input current third harmonic suppression system, the system comprising:
an initial unit for collecting the voltage real-time value u of the power grid s And calculates the voltage amplitude U sm ；
An execution unit for based on the voltage real-time value u s Acquiring a voltage vector angle theta of a power grid through a phase-locked loop; generating a cosine signal cos theta based on the voltage vector angle theta; output direct-current voltage command U based on preset dc * Obtaining an active current instruction I of the power grid through a voltage outer loop control loop sd * The method comprises the steps of carrying out a first treatment on the surface of the Based on the voltage amplitude U sm The cosine signal cos theta and the power grid active current command I sd * Predicting power fluctuation of a power grid; based on the predicted power fluctuation of the power grid, predicting voltage ripple in the output voltage by combining hardware parameters of the single-phase Pulse Width Modulation (PWM) rectifier;
results sheetA unit for superimposing said voltage ripple to an output voltage compacting value U of the control system dc Obtaining a power grid current active value instruction I through a voltage outer ring sd * The method comprises the steps of carrying out a first treatment on the surface of the Instruction I based on the power grid current active value sd * The third harmonic of the input current of the single-phase Pulse Width Modulation (PWM) rectifier is suppressed.
7. The system according to claim 6, the execution unit for, based on the voltage real-time value u s Obtaining, by a phase-locked loop, a vector angle θ of a grid voltage, comprising:
compacting the electric current value u s Mapping to a two-phase stationary coordinate system to obtain u sα Compacting the electric current value u s Delay by 90 ° to obtain u sβ Will u sα 、u sβ U of two-phase rotation coordinate system is obtained by coordinate transformation sd 、u sq The method comprises the steps of carrying out a first treatment on the surface of the U is controlled by a control system sq The vector angle θ of the grid voltage is obtained by integration, controlled to 0, plus a speed feed forward of 314 rad/s.
8. The system of claim 6, the predicted grid power fluctuations being:
wherein p is s For real-time power of the grid, θ=ωt, ω is the grid voltage angular frequency, t is time, Δp s Is a fluctuating component of power.
9. The system of claim 6, wherein the predicted voltage ripple in the output voltage is:
wherein θ=ωt, ω is the grid voltage angular frequency, t is the time, U dc * And C is the output filter capacitor of the single-phase Pulse Width Modulation (PWM) rectifier for outputting the voltage command value.
10. The system of claim 6, the grid current active value command I sd * The method comprises the following steps:
wherein K is p ，K i Is the parameter of the PI controller, s is the Laplacian, U dc * Is a direct-current voltage command, U dc For outputting the real-time sampling value of the voltage, deltau dc Is the predicted voltage ripple.
11. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program for executing the method of any one of claims 1-5.
12. An electronic device, the electronic device comprising: a processor and a memory; wherein,,
the memory is used for storing the processor executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method of any one of claims 1-5.
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