CN112103970A - Method and device for suppressing inter-harmonic oscillation of grid-connected converter - Google Patents
Method and device for suppressing inter-harmonic oscillation of grid-connected converter Download PDFInfo
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention relates to a method and a device for suppressing inter-harmonic oscillation of a grid-connected converter, wherein the direct-current voltage of the grid-connected converter is output through a differential link by collecting the direct-current voltage of a direct-current input end of the grid-connected converter, and the direct-current voltage output by the differential link is amplified through a proportional link; the differential proportion amplification value of the direct-current voltage is fed forward to the command value of the direct-current voltage, so that the grid-connected converter oscillation induced by inter-harmonic is restrained. The invention has better inhibiting effect on converter oscillation induced by inter-harmonic by setting a differential proportion feedforward mode, so that the amplitude of system oscillation is greatly reduced.
Description
Technical Field
The application belongs to the technical field of power electronic equipment, and particularly relates to a method for suppressing inter-harmonic oscillation of a grid-connected converter.
Background
With the rapid development of new energy grid-connected power generation, flexible direct-current transmission, dynamic reactive compensation and other applications, the permeability of the power electronic converter in a power system is higher and higher. With the rapid development of modern industries, nonlinear power loads are increasing continuously, and a large amount of inter-harmonics appear in the grid voltage, so that the problem of grid-connected converter oscillation caused by the inter-harmonics cannot be ignored. The problems caused by inter-harmonics in the system are more and more prominent, and the pollution and the harm to the power grid are more and more serious. The new problem of oscillation caused by inter-harmonics presents different characteristics compared with the oscillation problem of the traditional power system.
Inter-harmonics refer to any voltage or current component at a non-integer multiple of the fundamental frequency, which is generated by many devices in an electrical power system. Taking the frequency conversion device as an example, when the input frequency of the frequency conversion device is not consistent with the output frequency, the voltage ripple caused by the inverter circuit on the direct current side is coupled through the rectifying side, so that the voltage ripple is modulated by the power frequency component of the power grid to generate an inter-harmonic current to be output to the power grid, and the phase sequence of the inter-harmonic current and the modulated fundamental wave or harmonic phase sequence are output to the power grid. The inter-harmonic current passing through the line impedance generates a corresponding inter-harmonic voltage, resulting in the grid voltage containing inter-harmonic components.
The low-frequency inter-harmonic voltage of the system can cause continuous periodic fluctuation in active power output by the grid-connected converter, and when the frequency of the power fluctuation is the same as the frequency of the low-frequency weak damping oscillation mode of the converter, the system can generate forced vibration to cause the amplitude of output inter-harmonic current to be amplified, so that the system oscillation is induced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method aims to solve the problem that the harmonic wave between the power grids induces the grid-connected converter to oscillate at present.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a method for suppressing inter-harmonic oscillation of a grid-connected converter in a first aspect, which comprises the following steps:
collecting alternating current at an alternating current output end of a grid-connected inverter, converting the alternating current under a three-phase static coordinate system into a current vector i under a two-phase rotating coordinate system through coordinate transformation according to an output phase theta of a grid-connected point phase-locked loopd、iq；
Collecting direct-current voltage at a direct-current input end of a grid-connected converter, regulating the direct-current voltage by a PD (potential difference), and outputting the direct-current voltage regulated by the PD as feedforward of a d-axis direct-current voltage loop;
after the direct current voltage output after the PD adjustment is different from the given value of the direct current voltage, the output of the PI controller is used as the given value of a d-axis current loop through a PI controller, and the feedback of the d-axis current loop adopts a current vector i after coordinate transformationdThe output of the d-axis current loop is the voltage vector v of the d-axisd；
Giving a q-axis current according to the power factor requirement of a grid-connected converter, and feeding back a q-axis current loop by using a q-axis current vector i after coordinate transformationqThe output of the q-axis current loop is the voltage vector v of the d-axisq；
According to the output phase theta of the grid-connected point phase-locked loop, the voltage vector v is converted into a voltage vector vd、vqConverting the voltage into the AC output voltage u of the grid-connected converter under the three-phase static coordinate system through coordinate transformationabc；
And calculating the duty ratio of a switching device of the grid-connected converter by adopting a PWM algorithm according to the alternating current output voltage, and outputting a PWM signal to control the output of the grid-connected converter.
The second aspect of the present invention provides a grid-connected converter inter-harmonic oscillation suppression apparatus, including:
the first coordinate conversion module is used for collecting alternating current at the alternating current output end of the grid-connected inverter and converting the alternating current in a three-phase static coordinate system into a current vector i in a two-phase rotating coordinate system through coordinate conversion according to the output phase theta of the grid-connected point phase-locked loopd、iq；
The PD adjusting module is used for acquiring direct-current voltage at a direct-current input end of the grid-connected converter, outputting the direct-current voltage after the direct-current voltage is adjusted by the PD, and taking the direct-current voltage output after the PD is adjusted as feedforward of the d-axis direct-current voltage loop;
a d-axis current loop module, configured to use the output of the PI controller as the given value of the d-axis current loop after the difference is made between the dc voltage output after the PD adjustment and the given value of the dc voltage, and use the feedback of the d-axis current loop as the given value of the d-axis current loop by using a current vector i after coordinate transformationdThe output of the d-axis current loop is the voltage vector v of the d-axisd；
The q-axis current loop module is used for giving a given q-axis current according to the power factor requirement of the grid-connected converter, and the feedback of the q-axis current loop adopts a q-axis current vector i after coordinate transformationqThe output of the q-axis current loop is the voltage vector v of the d-axisq；
A second coordinate conversion module for converting the voltage vector v according to the output phase theta of the grid-connected point phase-locked loopd、vqConverting the voltage into the AC output voltage u of the grid-connected converter under the three-phase static coordinate system through coordinate transformationabc；
And the PWM module is used for calculating the duty ratio of a switching device of the grid-connected converter by adopting a PWM algorithm according to the alternating current output voltage and outputting a PWM signal to control the output of the grid-connected converter.
The invention has the beneficial effects that: according to the invention, on the time scale of the direct-current voltage, the differential of the direct-current voltage is fed back to the instruction value of the direct-current voltage through a proportion link, and the differential proportion feedforward mode is set, so that the converter oscillation induced by inter-harmonic waves is well inhibited, and the amplitude of the system oscillation is greatly reduced.
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
FIG. 1 is a control block diagram of a grid-connected converter according to an embodiment of the invention;
FIG. 2 is a graph of amplitude amplification factor λ versus frequency ratio τ for converter inter-harmonic oscillation in accordance with an embodiment of the present invention;
FIG. 3 is an oscillation diagram of the grid-connected converter before the oscillation suppression method is adopted when the inter-harmonic frequency is 29Hz according to the embodiment of the invention;
fig. 4 is a diagram of the direct-current voltage of the grid-connected converter after the oscillation suppression method is adopted when the inter-harmonic frequency is 29Hz in the embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The invention mainly aims at the suppression of inter-harmonic induced oscillation of the grid-connected converter, needs to establish a full-order state space model of the grid-connected converter under inter-harmonic disturbance in order to disclose the mechanism of the inter-harmonic induced converter oscillation, and simplifies the equivalence into a second-order model:
where ζ is the damping ratio, ωnIs the undamped oscillation frequency of the second-order system, x is the variable of the second-order system,
is the first differential of the second-order system variable,
is the second derivative of the second order system variable.
Calculating the amplitude amplification factor lambda of the converter inter-harmonic oscillation as follows:
τ＝ωc/ωn
wherein, tau is frequency ratio, zeta is damping ratio, omeganFrequency of undamped oscillation, omega, for a second order systemcIs the inverter frequency.
From the above equation, the relationship between the amplitude amplification factor λ and the frequency ratio τ of the inter-harmonic oscillation of the current transformer can be obtained, as shown in fig. 2. As can be seen from fig. 2, when τ is 1, ω isc＝ωnIn time, the converter system can amplify smaller harmonic power disturbance to a larger extent, so that the system is oscillated.
As can be seen from the expression of the amplitude amplification factor λ, the amplitude amplification factor λ of the inter-harmonic oscillation of the converter is related to not only the frequency of the power disturbance but also the damping of the oscillation mode of the converter itself, and the larger the damping is, the smaller the value of λ is when τ is 1, and therefore, in order to effectively suppress the inter-harmonic induced system oscillation, the damping of the system oscillation mode needs to be improved as much as possible.
The invention adjusts the detected direct current voltage at the direct current input end of the grid-connected converter through PD to be used as the feedforward of direct current voltage control, and adopts the active damping of the direct current voltage time scale to inhibit the oscillation induced by inter-harmonic.
Example 1
The embodiment provides a method for suppressing inter-harmonic oscillation of a grid-connected converter, as shown in fig. 1, including:
FIG. 1 shows a control block diagram of a grid-connected converter, P, according to an embodiment of the present inventioninThe power input by the front end of the main flow of the converter can be a fan, photovoltaic or direct-current transmission. PeFor the output power of the converter, utabcTo the grid-connected point voltage ugabcIs the system voltage; l is the filter inductance of the converter, LgAnd CgRespectively, a line equivalent inductor and a capacitor.
The suppression method of the embodiment adopts a coordinate transformation mode to control the reactive current and the active current under a two-phase rotating coordinate system. In the embodiment, the current sensor can be adopted to collect the alternating current output current i of the grid-connected converterabcThen, according to the output phase theta of the PCC phase-locked loop PLL of the grid-connected point, the alternating current in the three-phase static coordinate system is converted into a current vector i in the two-phase rotating coordinate systemd、iq。
And 2, acquiring direct-current voltage at a direct-current input end of the grid-connected converter, regulating the direct-current voltage by a PD (potential difference) and outputting the regulated direct-current voltage as feed-forward of the d-axis direct-current voltage loop.
As shown in fig. 1, the active shaft of the d-axis in the two-phase rotating coordinate system is controlled by using a double closed loop, wherein the outer loop is a dc voltage loop to realize dc voltage control, and the inner loop is a d-axis current loop to realize active current control of the d-axis.
In this embodiment, the collected dc voltage U is measured on the time scale of the dc voltagedcFeedforward to a given value U of direct current voltage after PD adjustmentdcref。
And 3, after the difference is made between the direct current voltage output after the PD is regulated and a given value of the direct current voltage, the output of the PI controller is used as the given value of a d-axis current loop through a PI controller, and the feedback of the d-axis current loop adopts a current vector i after coordinate transformationdThe output of the d-axis current loop is the voltage vector v of the d-axisd。
The DC voltage output after PD regulation is Udc(1+skfv) A 1 is to PD regulating the output DC voltage feedforward to the DC voltage set value UdcrefWill U isdc(1+skfv)-UdcrefInputting the current to a PI controller, and outputting a given i of a d-axis current loop after PI regulationdrefNamely:
wherein, UdcIs the DC voltage of a converter, UdcrefFor a given value of the converter DC voltage, kvpIs a proportionality coefficient, kviIs an integral coefficient, kfvIs a proportional differential feedforward coefficient, and s is a phasor expression factor of a frequency domain.
The feedback of the d-axis current loop adopts a current vector i after coordinate transformationdFeedback of d-axis current loop idGiven i with d-axis current loopdrefAfter difference is made, the voltage vector v of the d axis is output through PI regulationd。
In the embodiment, the q axis adopts single closed loop control, the current of the q axis is given by iqcrefThe feedback of the q-axis current loop adopts a q-axis current vector i after coordinate transformationqGiving the current of q-axis to iqcrefFeedback i with q-axis current loopqAfter difference is made, the voltage vector v of the q axis is output through PI regulationq。
Step 5, according to the output phase theta of the grid-connected point phase-locked loop, the voltage vector v is converted into a voltage vector vd、 vqConverting the voltage into the AC output voltage u of the grid-connected converter under the three-phase static coordinate system through coordinate transformationabc。
As shown in fig. 1, the PLL of the phase-locked loop of the present embodiment is used to detect the frequency and phase of the grid voltage at the PCC of the grid-on point, provide a coordinate reference for vector control, and apply the voltage vector v according to the output phase θ of the PLLd、vqConverting the voltage into the AC output voltage u of the grid-connected converter under the three-phase static coordinate system through coordinate transformationabc。
And 6, calculating the duty ratio of a switching device of the grid-connected converter by adopting a PWM algorithm according to the alternating current output voltage, and outputting a PWM signal to control the output of the grid-connected converter.
In the embodiment, on the time scale of the direct-current voltage, the differential of the direct-current voltage is fed forward to the command value of the direct-current voltage through the proportional loop, and the inter-harmonic induced oscillation is suppressed by adopting the active damping of the time scale of the direct-current voltage. Furthermore, with the method of the present invention, the amplitude amplification factor is greatly reduced when the frequency ratio τ is 1.
Taking the inter-harmonic frequency of 29Hz as an example, as shown in fig. 3, before the suppression method of the present invention is adopted, the direct-current voltage of the converter has a larger subsynchronous oscillation due to the fact that the grid voltage only contains 1% of the inter-harmonic voltage, and the oscillation has a tendency of further amplification, which seriously threatens the safe and stable operation of the converter.
Fig. 4 is a diagram of the dc voltage of the grid-connected converter after the suppression method according to the embodiment of the present invention is adopted, and it can be seen from fig. 4 that the amplitude of the system oscillation is greatly reduced, and it can be seen that the present invention has a better suppression effect on the converter oscillation induced by inter-harmonics by setting a fractional proportion feedforward manner.
Example 2:
the embodiment provides a grid-connected converter inter-harmonic oscillation suppression device, including:
the first coordinate conversion module is used for collecting alternating current at the alternating current output end of the grid-connected inverter and converting the alternating current in a three-phase static coordinate system into a current vector i in a two-phase rotating coordinate system through coordinate conversion according to the output phase theta of the grid-connected point phase-locked loopd、iq；
The PD adjusting module is used for acquiring direct-current voltage at a direct-current input end of the grid-connected converter, outputting the direct-current voltage after the direct-current voltage is adjusted by the PD, and taking the direct-current voltage output after the PD is adjusted as feedforward of the d-axis direct-current voltage loop;
d-axis current loop moduleAfter the difference is made between the direct current voltage output after the PD is regulated and the given value of the direct current voltage, the output of the PI controller is used as the given value of a d-axis current loop through a PI controller, and the feedback of the d-axis current loop adopts a current vector i after coordinate transformationdThe output of the d-axis current loop is the voltage vector v of the d-axisd；
The q-axis current loop module is used for giving a given q-axis current according to the power factor requirement of the grid-connected converter, and the feedback of the q-axis current loop adopts a q-axis current vector i after coordinate transformationqThe output of the q-axis current loop is the q-axis voltage vector vq；
A second coordinate conversion module for converting the voltage vector v according to the output phase theta of the grid-connected point phase-locked loopd、vqConverting the voltage into the AC output voltage u of the grid-connected converter under the three-phase static coordinate system through coordinate transformationabc；
And the PWM module is used for calculating the duty ratio of a switching device of the grid-connected converter by adopting a PWM algorithm according to the alternating current output voltage and outputting a PWM signal to control the output of the grid-connected converter.
Please refer to embodiment 1 for the implementation of each module in this embodiment.
In light of the foregoing description of the preferred embodiments according to the present application, many modifications and variations can be made by the worker skilled in the art without departing from the scope of the present application. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer programs 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.
Claims (3)
1. A method for suppressing inter-harmonic oscillation of a grid-connected converter is characterized by comprising the following steps:
collecting alternating current at an alternating current output end of a grid-connected inverter, converting the alternating current under a three-phase static coordinate system into a current vector i under a two-phase rotating coordinate system through coordinate transformation according to an output phase theta of a grid-connected point phase-locked loopd、iq；
Collecting direct-current voltage at a direct-current input end of a grid-connected converter, regulating the direct-current voltage by a PD (potential difference), and outputting the direct-current voltage regulated by the PD as feedforward of a d-axis direct-current voltage loop;
after the direct current voltage output after the PD adjustment is different from the given value of the direct current voltage, the output of the PI controller is used as the given value of a d-axis current loop through a PI controller, and the feedback of the d-axis current loop adopts a current vector i after coordinate transformationdThe output of the d-axis current loop is the voltage vector v of the d-axisd；
Giving a q-axis current according to the power factor requirement of a grid-connected converter, and feeding back a q-axis current loop by using a q-axis current vector i after coordinate transformationqThe output of the q-axis current loop is the q-axis voltage vector vq；
According to the output phase theta of the grid-connected point phase-locked loop, the voltage vector v is converted into a voltage vector vd、vqConverting the voltage into the AC output voltage u of the grid-connected converter under the three-phase static coordinate system through coordinate transformationabc；
And calculating the duty ratio of a switching device of the grid-connected converter by adopting a PWM algorithm according to the alternating current output voltage, and outputting a PWM signal to control the output of the grid-connected converter.
2. The method for suppressing inter-harmonic oscillation of the grid-connected converter according to claim 1, wherein a transfer function of the PD controller is:
1+skfv
wherein k isfvIs a proportional differential feedforward coefficient, and s is a phasor expression factor in the frequency domain.
3. A grid-connected converter inter-harmonic oscillation suppression device is characterized by comprising:
the first coordinate conversion module is used for collecting alternating current at the alternating current output end of the grid-connected inverter and converting the alternating current in a three-phase static coordinate system into a current vector i in a two-phase rotating coordinate system through coordinate conversion according to the output phase theta of the grid-connected point phase-locked loopd、iq；
The PD adjusting module is used for acquiring direct-current voltage at a direct-current input end of the grid-connected converter, outputting the direct-current voltage after the direct-current voltage is adjusted by the PD, and taking the direct-current voltage output after the PD is adjusted as feedforward of the d-axis direct-current voltage loop;
a d-axis current loop module, configured to use the output of the PI controller as the given value of the d-axis current loop after the difference is made between the dc voltage output after the PD adjustment and the given value of the dc voltage, and use the feedback of the d-axis current loop as the given value of the d-axis current loop by using a current vector i after coordinate transformationdThe output of the d-axis current loop is the voltage vector v of the d-axisd；
The q-axis current loop module is used for giving a given q-axis current according to the power factor requirement of the grid-connected converter, and the feedback of the q-axis current loop adopts a q-axis current vector i after coordinate transformationqThe output of the q-axis current loop is the q-axis voltage vector vq；
A second coordinate conversion module for converting the voltage vector v according to the output phase theta of the grid-connected point phase-locked loopd、vqConverting the voltage into the AC output voltage u of the grid-connected converter under the three-phase static coordinate system through coordinate transformationabc；
And the PWM module is used for calculating the duty ratio of a switching device of the grid-connected converter by adopting a PWM algorithm according to the alternating current output voltage and outputting a PWM signal to control the output of the grid-connected converter.
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