CN110336279A - Power system oscillation Adaptive Suppression method, system and medium based on grid-connection converter - Google Patents
Power system oscillation Adaptive Suppression method, system and medium based on grid-connection converter Download PDFInfo
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- CN110336279A CN110336279A CN201910645896.1A CN201910645896A CN110336279A CN 110336279 A CN110336279 A CN 110336279A CN 201910645896 A CN201910645896 A CN 201910645896A CN 110336279 A CN110336279 A CN 110336279A
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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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- 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
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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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- 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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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Abstract
The invention discloses a kind of power system oscillation Adaptive Suppression method, system and medium based on grid-connection converter, belongs to power system dynamic stability field.The feedback electric signal of present invention acquisition the connected power grid of grid-connection converter, fundamental component is separated for feedback electric signal, feedback electric signal after obtaining separation fundamental component, oscillator signal feature is extracted for the feedback electric signal after separation fundamental component, generating oscillation according to the feedback electric signal after separation fundamental component, oscillator signal feature inhibits the current controling signal of signal, the grid-connection converter that is added to obtain composite control signal, and generate PWM start pulse signal and export to the control terminal of grid-connection converter, realize the Adaptive Suppression to power system oscillation.The present invention can be realized the online recognition and Adaptive Suppression to the oscillation of electric system middle and high frequency range, can effectively improve the dynamic stability service ability of electric system.
Description
Technical field
The present invention relates to the oscillation suppression technologies of electric system, and in particular to a kind of electric system based on grid-connection converter
Vibrate Adaptive Suppression method, system and medium.
Background technique
The new energy such as large-scale wind-powered electricity generation, photovoltaic it is grid-connected provide clean electric power for electric system while, also to electric power
The safe and stable operation of system brings certain challenge.The new energy such as wind-powered electricity generation, photovoltaic are generally by being based on power electronic devices
Grid-connection converter realize that AC electric power systems convert and accessed to various forms of energy, and grid-connection converter is different from tradition base
In the electrical converter device of ferromagnetic element, the transformation of electricity is realized by the orderly folding of switch, therefore grid-connection converter
Dynamic characteristic not only by the dynamic influence of switch, is more largely influenced by its control algolithm.Grid-connection converter
Complex control algorithm be system operations staff understand that its dynamic characteristic brings challenge.Simultaneously as equipment manufacturing Shang She
The complex electric network condition of practical power systems is not considered generally when counting the control algolithm of converter, so that the control designed is calculated
Method may cause systematicness oscillation after can not adapting to actual motion system environments, or even access electric system, endanger electric system
Stable operation.It is large-scale wind power, grid-connected to cause in systems in practice from the point of view of domestic and international operation of power networks relevant report
Oscillation event, and cause heavy economic losses, therefore corresponding oscillation braking measure need to be sought.
The oscillation of electric system is generally caused by grid-connected equipment own mechanical/electrical characteristic or control characteristic, oscillation
The complicated multiplicity of form, surge frequency range is wide, and the especially oscillation that is caused of grid-connection converter is up to thousand hertz.For electric power
All kinds of oscillations in system, braking measure is also compared with horn of plenty.As a whole, the braking measure of oscillation generally can be from adjustment device
Self character is started with two aspects of composed of external damping device, and two kinds of oscillation suppressor modes respectively have advantage and disadvantage.
Such as application No. is a kind of resistances of the electric system containing more Fans of the Chinese patent literature of CN201610060554.X
The method and system of Buddhist nun's control, this method pass through measurement blower dominant eigenvalues signal and interregional alternating current interconnection power letter
Number, obtain blower interconnection tie power fluctuation signal sequence and interregional alternating current interconnection tie power fluctuation signal sequence.Then basis
The subspace state space identification algorithm of above-mentioned signal sequence combination electric system constructs POWER SYSTEM STATE spatial model.And benefit
Blower installing is chosen using the additional damping controller of phase compensation method design with the model, is shaken with improving to electric system low frequency
The inhibitory effect swung.But this method is only adapted to the electric system containing wind-electricity integration.
Such as application No. is the Chinese patent literature of CN201820681809., to disclose a kind of distribution time based on energy storage same
Vibration suppression device and new energy transmission system are walked, which inhibits device to be mounted on new energy electric field and bus rod
Between transmission line of electricity on, by by the device serial connection in transmission line of electricity, and according to sub-synchronous oscillation impedance signal to power transmission line
Sub-synchronous oscillation impedance voltage, the final inhibition realized to system sub-synchronous oscillation are injected in road.Wherein, energy storage device is for putting down
Press down the fluctuation that sub-synchronous oscillation inhibits capacitor both end voltage in equipment, inhibits device so as to improve distributed sub-synchronous oscillation
Rejection ability, increase inhibit sub-synchronous oscillation frequency range.But this method is mainly used for that new-energy grid-connected is inhibited to be drawn
The system sub-synchronous oscillation of hair, need to install corresponding vibration suppression device additional.
Such as application No. is the Chinese patent literatures of CN201610604425. to disclose a kind of adjustable impedance formula distributed photovoltaic
Power generation cluster resonance inhibiting system and suppressing method, this method are connected in parallel in system busbar and distributed photovoltaic power generation cluster
Adjustable impedance is installed on points of common connection additional, by the resonance conditions of central control unit detection system, when the system that detects produces
When raw resonance, i.e., the reactor group in unit is inhibited to circuit sequentially switching since intergrade resonance, until the parallel connection of system
Resonance is inhibited.But this method inhibits mainly for the resonance that distributed photovoltaic power generation group system causes.
The large-scale grid connection of the equipments such as wind-powered electricity generation/photovoltaic, frequency conversion drive load to have accessed in system largely simultaneously at present
Net transformation device.Grid-connection converter brings challenge to system stable operation, but its control characteristic has extremely strong plasticity, if energy
Its control algolithm is reasonably designed, then can effectively avoid its bring from negatively affecting, or even further enhance electric system
Stable operation ability.For this purpose, be based on grid-connection converter, in system it is difficult to predict oscillation, how to realize that one kind can be automatic
The damping method for adapting to frequency of oscillation, has become a key technical problem urgently to be resolved.
Summary of the invention
The technical problem to be solved in the present invention: for the uncertain problem of power system oscillation form, a kind of base is provided
In power system oscillation Adaptive Suppression method, system and the medium of grid-connection converter, the present invention is directed to electric system medium, high frequency
The oscillation problem of section proposes to realize the online recognition and adaptive suppression to system oscillation using grid-connection converter optimal control
System.This method realizes the identification to system oscillation mode by the extraction to power grid oscillation harmonic current component, and then using certainly
Adaptive algorithm adjusts converter optimal control response band and realizes the damping to system oscillation, and the present invention can recognize automatically is
System oscillation information is simultaneously vibrated according to identification information adjusting grid-connection converter control strategy with damping system, reduces power system oscillation
Risk improves the dynamic stability service ability of electric system.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A kind of power system oscillation Adaptive Suppression method based on grid-connection converter, implementation steps include:
1) the feedback electric signal of the connected power grid of grid-connection converter is acquired；
2) fundamental component is separated for feedback electric signal, the feedback electric signal after obtaining separation fundamental component；
3) oscillator signal feature is extracted for the feedback electric signal after separation fundamental component；
4) it is generated according to the feedback electric signal after separation fundamental component, oscillator signal feature each for adjusting grid-connection converter
The responsive bandwidth of a controlling brancher is to change grid-connection converter corresponding frequency band dynamic characteristic and realize adaptive to power system oscillation
The oscillation that should inhibit inhibits signal；
5) current controling signal for inhibiting signal synthesis to be added to grid-connection converter will be vibrated and obtains composite control signal；
6) PWM start pulse signal is generated according to composite control signal to export to the control terminal of grid-connection converter, realization pair
The Adaptive Suppression of power system oscillation.
Optionally, the detailed step of step 2) includes:
2.1) the feedback electric signal of the connected power grid of grid-connection converter is mapped into synchronized rotation by coordinate direct transform
Turn coordinate system, so that fundamental component is converted into direct current signal；
2.2) fundamental frequency point of direct current signal will be converted in the feedback electric signal mapped in synchronized rotating coordinate system
Amount filters out, and realizes the separation of the fundamental component and other components of feedback electric signal；
2.3) it the feedback electric signal after fundamental component will be filtered out carries out coordinate conversion map and return rest frame, separated
Feedback electric signal after fundamental component.
Optionally, direct current will be converted in the feedback electric signal mapped in synchronized rotating coordinate system in step 2.2)
When the fundamental component of signal filters out, used filter is high-pass filter or trapper.
Optionally, described when extracting oscillator signal feature for the feedback electric signal after separation fundamental component in step 3)
Extract the frequency of oscillation or amplitude or phase that oscillator signal feature is the feedback electric signal after separating fundamental component.
Optionally, the feedback electric signal of acquisition the connected power grid of grid-connection converter is feedback voltage signal in step 1).
Optionally, the feedback electric signal of acquisition the connected power grid of grid-connection converter is fed-back current signals i in step 1)dq；
Step 2) obtain separation fundamental component after feedback electric signal be separation fundamental component after fed-back current signals ihdq；Step 3)
In when extracting oscillator signal feature for the feedback electric signal after separation fundamental component, the oscillator signal feature of the extraction is point
From the fed-back current signals i after fundamental componenthdqPhase thetai, and the detailed step for extracting oscillator signal feature includes:
3.1) by the fed-back current signals i after separation fundamental componenthdqCarry out proportional plus integral control；
3.2) by the output result for carrying out proportional plus integral control and preset constant ωiSummation obtains oscillation signal frequency
ω, wherein preset constant ωiFor the ginseng of the response frequency range corresponding to determining optimal control in the initial state for setting
Number；
3.3) oscillation signal frequency ω is obtained to the fed-back current signals i after separation fundamental component by integral operationhdq's
Phase thetai, and by separate fundamental component after fed-back current signals ihdqPhase thetaiThe oscillator signal feature obtained as extraction.
Optionally, the feedback electric signal of acquisition the connected power grid of grid-connection converter is fed-back current signals i in step 1)dq；
Step 2) obtain separation fundamental component after feedback electric signal be separation fundamental component after fed-back current signals ihdq；Step 3)
In when extracting oscillator signal feature for the feedback electric signal after separation fundamental component, the oscillator signal feature of the extraction is point
From the fed-back current signals i after fundamental componenthdqPhase thetai；The detailed step of step 4) includes:
4.1) by the fed-back current signals i after separation fundamental componenthdqSynchronized rotation is mapped to by coordinate direct transform
Coordinate system obtains the electric current output component i of DC formhxAnd ihy；
4.2) it is directed to the electric current output component i of DC formhxAnd ihyIt carries out transformation of scale and low-pass filtering, generation is used for
The responsive bandwidth of each controlling brancher of grid-connection converter is adjusted to change grid-connection converter corresponding frequency band dynamic characteristic and realization pair
The oscillation of power system oscillation Adaptive Suppression inhibits signal；
4.3) will oscillation inhibit signal coordinates carry out coordinate conversion map return rest frame, make its with separate fundamental component
Fed-back current signals i afterwardshdqThe coordinate system at place is identical.
The power system oscillation Adaptive Suppression system based on grid-connection converter that the present invention also provides a kind of, comprising:
Signal sampling program unit, for sampling the feedback electric signal of the connected power grid of grid-connection converter；
Signal Pretreatment program unit, for being directed to the feedback electric signal un-mixing bases frequency division of the connected power grid of grid-connection converter
Amount, the feedback electric signal after obtaining separation fundamental component；
Oscillator signal feature identification program unit, for extracting oscillation letter for the feedback electric signal after separation fundamental component
Number feature；
Oscillation inhibits signal to generate program unit, for according to feedback electric signal, the oscillator signal after separation fundamental component
Feature is generated for adjusting the responsive bandwidth of each controlling brancher of grid-connection converter to change grid-connection converter corresponding frequency band dynamic
Characteristic simultaneously realizes that the oscillation to power system oscillation Adaptive Suppression inhibits signal；
Signal synthesis program unit, for the current controling signal for inhibiting signal synthesis to be added to grid-connection converter will to be vibrated
Obtain composite control signal；
Signal output program unit is exported for generating PWM start pulse signal according to composite control signal to grid-connected change
The control terminal of parallel operation realizes the Adaptive Suppression to power system oscillation.
The power system oscillation Adaptive Suppression system based on grid-connection converter that the present invention also provides a kind of, including computer
Equipment, the computer equipment are programmed or are configured to execute the power system oscillation Adaptive Suppression based on grid-connection converter
Be stored on the storage medium of the step of method or the computer equipment be programmed or configure with execute it is described based on and net transformation
The computer program of the power system oscillation Adaptive Suppression method of device.
The present invention also provides a kind of computer readable storage medium, it is stored with and is programmed on the computer readable storage medium
Or it configures to execute the computer program of the power system oscillation Adaptive Suppression method based on grid-connection converter.
The power system oscillation Adaptive Suppression system based on grid-connection converter that the present invention also provides a kind of, including direct current filter
Wave capacitor, grid-connection converter, alternating current filter and control unit, the DC filter capacitor pass sequentially through grid-connection converter, hand over
Stream filter is connected with power grid, and the feedback electric signal input end of described control unit and grid-connection converter exchange that side is connected, controls
Output end processed is connected with the control terminal of grid-connection converter, and described control unit is according to the current instruction value and grid-connection converter received
Exchange side input feedback electric signal carry out current control obtain current controling signal, the control unit be programmed or configure with
The step of executing the power system oscillation Adaptive Suppression method based on grid-connection converter；Or the storage of the control unit is situated between
It is stored in matter and is programmed or configures to execute the power system oscillation Adaptive Suppression method based on grid-connection converter
Computer program.
Compared to the prior art, the present invention has an advantage that
1, the present invention be directed to the middle and high frequency range of electric system oscillation problem, propose using grid-connection converter optimal control with
Realize the online recognition and Adaptive Suppression to system oscillation.This method by power grid vibrate harmonic current component extraction,
It realizes the identification to system oscillation mode, and then utilizes adaptive algorithm adjustment converter optimal control response band and realization pair
The damping of system oscillation, the present invention can automatic identification system oscillation information and according to identification information adjust grid-connection converter control
Strategy is vibrated with damping system, is reduced power system oscillation risk, is improved the dynamic stability service ability of electric system.
2, the present invention is by separating fundamental component for feedback electric signal, the feedback telecommunications after obtaining separation fundamental component
Number, fundamental component can be efficiently separated, is laid the foundation to extract oscillation information about power；By for the feedback after separation fundamental component
Electric signal extracts oscillator signal feature, can effective extraction system oscillator signal feature, be the adaptive of converter dynamic characteristic
Adjustment provides safeguard；It is grid-connected for adjusting by being generated according to the feedback electric signal after separation fundamental component, oscillator signal feature
The responsive bandwidth of each controlling brancher of converter is to change grid-connection converter corresponding frequency band dynamic characteristic and realize to electric system
The oscillation for vibrating Adaptive Suppression inhibits signal, can be realized the adaptive adjustment to grid-connection converter dynamic characteristic, to improve
Damping of the converter in corresponding frequency band；It is obtained by the way that the current controling signal for inhibiting signal synthesis to be added to grid-connection converter will be vibrated
To composite control signal, it can be achieved that the synthesis of conventional current control output and inventive algorithm output signal, is not being changed with realizing
Become adjustment equipment characteristic on the basis of original conventional current control algolithm.
Detailed description of the invention
Fig. 1 is the basic procedure schematic diagram of present invention method.
Fig. 2 is the pretreated flow diagram of step 2) of the embodiment of the present invention.
Fig. 3 is the flow diagram that the oscillation of step 4) of the embodiment of the present invention inhibits signal to generate.
Fig. 4 is the structure and module diagram of system of the embodiment of the present invention.
Marginal data: 1, DC filter capacitor；2, grid-connection converter；3, alternating current filter；4, control unit；41, signal
Sampling routine unit；42, Signal Pretreatment program unit；43, oscillator signal feature identification program unit；44, oscillation inhibits letter
Number generate program unit；45, signal synthesis program unit；46, signal output program unit；47, conventional current controls program list
Member.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.
It should be appreciated that following embodiment is used only for explaining the present invention, but it is not intended to limit the scope of the invention.Based on this
Embodiment in invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the implementation of power system oscillation Adaptive Suppression method of the present embodiment based on grid-connection converter walks
Suddenly include:
1) the feedback electric signal of the connected power grid of grid-connection converter is acquired；
2) fundamental component is separated for feedback electric signal, the feedback electric signal after obtaining separation fundamental component；
3) oscillator signal feature is extracted for the feedback electric signal after separation fundamental component；
4) it is generated according to the feedback electric signal after separation fundamental component, oscillator signal feature each for adjusting grid-connection converter
The responsive bandwidth of a controlling brancher is to change grid-connection converter corresponding frequency band dynamic characteristic and realize adaptive to power system oscillation
The oscillation that should inhibit inhibits signal；
5) current controling signal for inhibiting signal synthesis to be added to grid-connection converter will be vibrated and obtains composite control signal；
6) PWM start pulse signal is generated according to composite control signal to export to the control terminal of grid-connection converter, realization pair
The Adaptive Suppression of power system oscillation.
As shown in Fig. 2, the detailed step of the present embodiment step 2) includes:
2.1) the feedback electric signal of the connected power grid of grid-connection converter is mapped into synchronized rotation by coordinate direct transform
Turn coordinate system, so that fundamental component is converted into direct current signal；
2.2) fundamental frequency point of direct current signal will be converted in the feedback electric signal mapped in synchronized rotating coordinate system
Amount filters out, and realizes the separation of the fundamental component and other components of feedback electric signal；
2.3) it the feedback electric signal after fundamental component will be filtered out carries out coordinate conversion map and return rest frame, separated
Feedback electric signal after fundamental component.
In the present embodiment, it will be converted in the feedback electric signal mapped in synchronized rotating coordinate system in step 2.2)
When the fundamental component of direct current signal filters out, used filter is high-pass filter.It should be pointed out that Fig. 2 is only gived
A kind of side of Signal Pretreatment (separating fundamental component for feedback electric signal, the feedback electric signal after obtaining separation fundamental component)
Method, other are used to separate the filtering algorithm of fundamental wave, such as trapper, it can also be used to realize Signal Pretreatment, it may be assumed that for feedback telecommunications
Number separation fundamental component, obtain separation fundamental component after feedback electric signal.
When extracting oscillator signal feature for the feedback electric signal after separation fundamental component in step 3), the extraction oscillation
Signal characteristic is the frequency of oscillation or amplitude or phase of the feedback electric signal after separating fundamental component.
The feedback electric signal of acquisition the connected power grid of grid-connection converter is feedback voltage signal or feedback current in step 1)
Signal.
As a kind of specific embodiment, the anti-of the connected power grid of grid-connection converter is acquired in the present embodiment in step 1)
Electric feed signal is fed-back current signals idq；Step 2) obtain separation fundamental component after feedback electric signal for separation fundamental component after
Fed-back current signals ihdq；When extracting oscillator signal feature for the feedback electric signal after separation fundamental component in step 3), institute
The oscillator signal feature for stating extraction is the fed-back current signals i separated after fundamental componenthdqPhase thetai, and extract oscillator signal
The detailed step of feature includes:
3.1) by the fed-back current signals i after separation fundamental componenthdqCarry out proportional plus integral control；
3.2) by the output result for carrying out proportional plus integral control and preset constant ωiSummation obtains oscillation signal frequency
ω, wherein preset constant ωiFor the ginseng of the response frequency range corresponding to determining optimal control in the initial state for setting
Number；
3.3) oscillation signal frequency ω is obtained to the fed-back current signals i after separation fundamental component by integral operationhdq's
Phase thetai, and by separate fundamental component after fed-back current signals ihdqPhase thetaiThe oscillator signal feature obtained as extraction.
As a kind of specific embodiment, as shown in figure 3, the detailed step of step 4) includes: in the present embodiment
4.1) by the fed-back current signals i after separation fundamental componenthdqSynchronized rotation is mapped to by coordinate direct transform
Coordinate system obtains the electric current output component i of DC formhxAnd ihy；
4.2) it is directed to the electric current output component i of DC formhxAnd ihyIt carries out transformation of scale and low-pass filtering, generation is used for
The responsive bandwidth of each controlling brancher of grid-connection converter is adjusted to change grid-connection converter corresponding frequency band dynamic characteristic and realization pair
The oscillation of power system oscillation Adaptive Suppression inhibits signal, it may be assumed that ecxy；
4.3) will oscillation inhibit signal coordinates carry out coordinate conversion map return rest frame, make its with separate fundamental component
Fed-back current signals i afterwardshdqThe coordinate system at place is identical to get arriving: ecdq。
Referring to Fig. 3, the electric current output component i of DC form is directed in the present embodiment step 4.2)hxAnd ihyCarry out ratio change
Change with shown in the processing mathematic(al) representation such as formula (1) that is used when low-pass filtering:
Rv/(Tus+1)(1)
In formula (1), RvIndicate the coefficient of ratio enlargement, TuIndicate low-pass filtering time constant, s is input quantity；
In the present embodiment, synchronized rotational coordinates is mapped to by coordinate direct transform in step 2.1) and step 4.1)
The transition matrix of system is C2s/2r, shown in mathematic(al) representation such as formula (2)；In the present embodiment, in step 2.3) and step 4.13)
It carries out coordinate conversion map and returns the transition matrix of rest frame to be C2r/2s, shown in mathematic(al) representation such as formula (3)；
In formula (2) and formula (3), θiIt indicates according to the fed-back current signals i after separation fundamental componenthdqPhase.
In addition, the present embodiment also provides a kind of power system oscillation Adaptive Suppression system based on grid-connection converter, packet
It includes:
Signal sampling program unit 41, for sampling the feedback electric signal of the connected power grid of grid-connection converter；
Signal Pretreatment program unit 42 separates fundamental frequency for the feedback electric signal for the connected power grid of grid-connection converter
Component, the feedback electric signal after obtaining separation fundamental component；
Oscillator signal feature identification program unit 43, for extracting oscillation for the feedback electric signal after separation fundamental component
Signal characteristic；
Oscillation inhibits signal to generate program unit 44, for being believed according to the feedback electric signal after separation fundamental component, oscillation
Number feature generates dynamic to change grid-connection converter corresponding frequency band for adjusting the responsive bandwidth of each controlling brancher of grid-connection converter
Step response simultaneously realizes that the oscillation to power system oscillation Adaptive Suppression inhibits signal；
Signal synthesis program unit 45, for the current control for inhibiting signal synthesis to be added to grid-connection converter letter will to be vibrated
Number obtain composite control signal；
Signal output program unit 46 is exported for generating PWM start pulse signal according to composite control signal to grid-connected
The control terminal of converter realizes the Adaptive Suppression to power system oscillation.
In the present embodiment, the current controling signal of grid-connection converter is existing conventional current control journey in control unit 4
Sequence unit 47 is obtained using existing Current Control Strategy, furthermore can also provide grid-connection converter by external processor
The mode of current controling signal meets the need of work of signal synthesis program unit 45, due to specifically how to obtain and net transformation
The current controling signal of device is not listed within above system not in the column of the present embodiment discussion.
It should be noted that above procedure unit can both be realized in single microprocessor, it can also be by multiple micro-
Data communication between processor combination microprocessor is realized.
In addition, the present embodiment also provides a kind of power system oscillation Adaptive Suppression system based on grid-connection converter, packet
Computer equipment is included, which is programmed or configures to execute the aforementioned power system oscillation based on grid-connection converter certainly
It is stored on the storage medium of the step of adapting to suppressing method or the computer equipment and is programmed or configures to execute aforementioned be based on
The computer program of the power system oscillation Adaptive Suppression method of grid-connection converter.
In addition, the present embodiment also provides a kind of computer readable storage medium, stored on the computer readable storage medium
Have and is programmed or configures to execute the computer journey of the aforementioned power system oscillation Adaptive Suppression method based on grid-connection converter
Sequence.
In addition, referring to fig. 4, the present embodiment also provides a kind of power system oscillation Adaptive Suppression based on grid-connection converter
System, including DC filter capacitor 1, grid-connection converter 2, alternating current filter 3 and control unit 4, DC filter capacitor 1 successively lead to
Cross grid-connection converter 2, alternating current filter 3 is connected with power grid, the feedback electric signal input end and grid-connection converter 2 of control unit 4
Exchange side be connected, control output end be connected with the control terminal of grid-connection converter 2, control unit 4 is according to the current-order received
Value carries out current control with the feedback electric signal for exchanging side input of grid-connection converter 2 and obtains current controling signal, and feature exists
In the control unit 4 is programmed or is configured to execute the aforementioned power system oscillation Adaptive Suppression side based on grid-connection converter
The step of method；Or be stored on the storage medium of the control unit 4 be programmed or configure it is aforementioned based on grid-connection converter to execute
Power system oscillation Adaptive Suppression method computer program.
It should be noted that control unit 4 exchanges side input according to the current instruction value received and grid-connection converter 2
Feedback electric signal carries out current control and obtains the existing Current Control Strategy that current controling signal is grid-connection converter 2, for real
Current control in existing converter, the specific implementation of control algolithm include but is not limited to double PI based on Phase-Locked Synchronous coordinate system
The control of ratio resonance, Bang-Bang control under control, rest frame etc..
Referring to fig. 2, the present embodiment signal sampling program unit 41 through signal filtering, becomes for acquiring power grid electric information
Each program unit is fed back to after changing, including for inputting according to the current instruction value received with the side that exchanges of grid-connection converter 2
Feedback electric signal carry out current control obtain current controling signal conventional current control program unit 47.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices work in a specific way
In the computer-readable memory of work, so that it includes command device that instruction stored in the computer readable memory, which generates,
Manufacture, the command device are realized in one or more flows of the flowchart and/or one or more blocks of the block diagram
In specify function.These computer program instructions also can be loaded onto a computer or other programmable data processing device, and make
It obtains and executes series of operation steps on a computer or other programmable device to generate computer implemented processing, thus counting
The instruction executed on calculation machine or other programmable devices is provided for realizing in one or more flows of the flowchart and/or side
The step of function of being specified in block diagram one box or multiple boxes.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (11)
1. a kind of power system oscillation Adaptive Suppression method based on grid-connection converter, it is characterised in that implementation steps include:
1) the feedback electric signal of the connected power grid of grid-connection converter is acquired；
2) fundamental component is separated for feedback electric signal, the feedback electric signal after obtaining separation fundamental component；
3) oscillator signal feature is extracted for the feedback electric signal after separation fundamental component；
4) it is generated according to the feedback electric signal after separation fundamental component, oscillator signal feature for adjusting each control of grid-connection converter
The responsive bandwidth of branch processed adaptively presses down power system oscillation with changing grid-connection converter corresponding frequency band dynamic characteristic and realizing
The oscillation of system inhibits signal；
5) current controling signal for inhibiting signal synthesis to be added to grid-connection converter will be vibrated and obtains composite control signal；
6) PWM start pulse signal is generated according to composite control signal to export to the control terminal of grid-connection converter, realize to electric power
The Adaptive Suppression of system oscillation.
2. the power system oscillation Adaptive Suppression method according to claim 1 based on grid-connection converter, feature exist
In the detailed step of step 2) includes:
2.1) the feedback electric signal of the connected power grid of grid-connection converter synchronized rotation is mapped to by coordinate direct transform to sit
Mark system, so that fundamental component is converted into direct current signal；
2.2) fundamental component that direct current signal is converted in the feedback electric signal mapped in synchronized rotating coordinate system is filtered
It removes, realizes the separation of the fundamental component and other components of feedback electric signal；
2.3) it the feedback electric signal after fundamental component will be filtered out carries out coordinate conversion map and return rest frame, obtain separation fundamental frequency
Feedback electric signal after component.
3. the power system oscillation Adaptive Suppression method according to claim 2 based on grid-connection converter, feature exist
In the fundamental frequency that will be converted to direct current signal in step 2.2) in the feedback electric signal mapped in synchronized rotating coordinate system divides
When amount filters out, used filter is high-pass filter or trapper.
4. the power system oscillation Adaptive Suppression method according to claim 1 based on grid-connection converter, feature exist
In, when extracting oscillator signal feature for the feedback electric signal after separation fundamental component in step 3), the extraction oscillator signal
Feature is the frequency of oscillation or amplitude or phase of the feedback electric signal after separating fundamental component.
5. the power system oscillation Adaptive Suppression method according to claim 1 based on grid-connection converter, feature exist
In the feedback electric signal of acquisition the connected power grid of grid-connection converter is feedback voltage signal in step 1).
6. the power system oscillation Adaptive Suppression method according to claim 1 based on grid-connection converter, feature exist
In the feedback electric signal of acquisition the connected power grid of grid-connection converter is fed-back current signals i in step 1)dq；Step 2) is divided
From the fed-back current signals i that the feedback electric signal after fundamental component is after separating fundamental componenthdq；Un-mixing bases are directed in step 3)
When feedback electric signal after frequency component extracts oscillator signal feature, the oscillator signal feature of the extraction is after separating fundamental component
Fed-back current signals ihdqPhase thetai, and the detailed step for extracting oscillator signal feature includes:
3.1) by the fed-back current signals i after separation fundamental componenthdqCarry out proportional plus integral control；
3.2) by the output result for carrying out proportional plus integral control and preset constant ωiSummation obtains oscillation signal frequency ω, wherein
Preset constant ωiFor the parameter of the response frequency range corresponding to determining optimal control in the initial state for setting；
3.3) oscillation signal frequency ω is obtained to the fed-back current signals i after separation fundamental component by integral operationhdqPhase
θi, and by separate fundamental component after fed-back current signals ihdqPhase thetaiThe oscillator signal feature obtained as extraction.
7. the power system oscillation Adaptive Suppression method according to claim 1 based on grid-connection converter, feature exist
In the feedback electric signal of acquisition the connected power grid of grid-connection converter is fed-back current signals i in step 1)dq；Step 2) is divided
From the fed-back current signals i that the feedback electric signal after fundamental component is after separating fundamental componenthdq；Un-mixing bases are directed in step 3)
When feedback electric signal after frequency component extracts oscillator signal feature, the oscillator signal feature of the extraction is after separating fundamental component
Fed-back current signals ihdqPhase thetai；The detailed step of step 4) includes:
4.1) by the fed-back current signals i after separation fundamental componenthdqSynchronized rotational coordinates is mapped to by coordinate direct transform
System, obtains the electric current output component i of DC formhxAnd ihy；
4.2) it is directed to the electric current output component i of DC formhxAnd ihyTransformation of scale and low-pass filtering are carried out, is generated for adjusting simultaneously
The responsive bandwidth of each controlling brancher of net transformation device is to change grid-connection converter corresponding frequency band dynamic characteristic and realize to power train
The oscillation of system oscillation Adaptive Suppression inhibits signal；
4.3) will oscillation inhibit signal coordinates carry out coordinate conversion map return rest frame, make its with separate fundamental component after
Fed-back current signals ihdqThe coordinate system at place is identical.
8. a kind of power system oscillation Adaptive Suppression system based on grid-connection converter, characterized by comprising:
Signal sampling program unit (41), for sampling the feedback electric signal of the connected power grid of grid-connection converter；
Signal Pretreatment program unit (42), for being directed to the feedback electric signal un-mixing bases frequency division of the connected power grid of grid-connection converter
Amount, the feedback electric signal after obtaining separation fundamental component；
Oscillator signal feature identification program unit (43), for extracting oscillation letter for the feedback electric signal after separation fundamental component
Number feature；
Oscillation inhibits signal to generate program unit (44), for according to feedback electric signal, the oscillator signal after separation fundamental component
Feature is generated for adjusting the responsive bandwidth of each controlling brancher of grid-connection converter to change grid-connection converter corresponding frequency band dynamic
Characteristic simultaneously realizes that the oscillation to power system oscillation Adaptive Suppression inhibits signal；
Signal synthesis program unit (45), for the current controling signal for inhibiting signal synthesis to be added to grid-connection converter will to be vibrated
Obtain composite control signal；
Signal output program unit (46) is exported for generating PWM start pulse signal according to composite control signal to grid-connected change
The control terminal of parallel operation realizes the Adaptive Suppression to power system oscillation.
9. a kind of power system oscillation Adaptive Suppression system based on grid-connection converter, including computer equipment, feature exist
In the computer equipment is programmed or is configured with the electricity based on grid-connection converter described in any one of perform claim requirement 1~7
Force system vibrate Adaptive Suppression method the step of or the computer equipment storage medium on be stored be programmed or configure with
Described in any one of perform claim requirement 1~7 based on the power system oscillation Adaptive Suppression method of grid-connection converter
Calculation machine program.
10. a kind of computer readable storage medium, which is characterized in that be stored on the computer readable storage medium be programmed or
Configuration is with the power system oscillation Adaptive Suppression side based on grid-connection converter described in any one of perform claim requirement 1~7
The computer program of method.
11. a kind of power system oscillation Adaptive Suppression system based on grid-connection converter, including DC filter capacitor (1), simultaneously
Net transformation device (2), alternating current filter (3) and control unit (4), the DC filter capacitor (1) pass sequentially through grid-connection converter
(2), alternating current filter (3) is connected with power grid, the feedback electric signal input end and grid-connection converter (2) of described control unit (4)
Exchange side be connected, control output end is connected with the control terminal of grid-connection converter (2), described control unit (4) basis receives
Current instruction value carries out current control with the feedback electric signal for exchanging side input of grid-connection converter (2) and obtains current control letter
Number, which is characterized in that the control unit (4) is programmed or is configured to be based on simultaneously described in any one of perform claim requirement 1~7
The step of power system oscillation Adaptive Suppression method of net transformation device；Or it is stored on the storage medium of the control unit (4)
It is programmed or configures and is adaptive with the power system oscillation based on grid-connection converter described in any one of perform claim requirement 1~7
Answer the computer program of suppressing method.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111313438A (en) * | 2020-03-31 | 2020-06-19 | 中国南方电网有限责任公司 | High-frequency oscillation suppression method and system for flexible direct current transmission system |
| CN111650617A (en) * | 2020-06-10 | 2020-09-11 | 国网湖南省电力有限公司 | Crystal oscillator frequency taming method, system and medium based on innovation weighted self-adaptive insensitive Kalman filtering |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130176751A1 (en) * | 2012-01-05 | 2013-07-11 | Ingeteam Power Technology, S.A. | Method and apparatus for controlling a frequency converter |
| CN103401242A (en) * | 2013-07-15 | 2013-11-20 | 合肥工业大学 | Multi-inverter system resonance restraining device and controlling method thereof |
| CN103887824A (en) * | 2014-04-17 | 2014-06-25 | 浙江大学 | Voltage loop ripple compensation control system and control method of photovoltaic grid-connected inverter |
| CN104934991A (en) * | 2015-06-23 | 2015-09-23 | 国家电网公司 | Self-adaptive current control system of grid-connected converter for inhibiting system high-frequency oscillation |
| CN104953801A (en) * | 2015-07-17 | 2015-09-30 | 清华大学 | Harmonic current suppression device and method for voltage source grid-connected inverter |
| CN105634006A (en) * | 2016-01-15 | 2016-06-01 | 珠海格力电器股份有限公司 | Grid-connected inverter control method and system |
| CN106253279A (en) * | 2016-08-23 | 2016-12-21 | 南京亚派科技股份有限公司 | A kind of anti-resonance control algolithm being applied to active filter |
| CN106300387A (en) * | 2015-06-10 | 2017-01-04 | 特变电工新疆新能源股份有限公司 | The given feed forward control method of electricity grid oscillating is dynamically suppressed based on SVG |
| CN106505840A (en) * | 2016-11-30 | 2017-03-15 | 云南电网有限责任公司 | A kind of grid-connected photovoltaic inverter harmonic wave management method |
| CN107221931A (en) * | 2017-06-08 | 2017-09-29 | 上海电力学院 | Z-source inverter grid-connected control method based on Active Power Filter-APF |
| CN107732961A (en) * | 2017-09-22 | 2018-02-23 | 中国南方电网有限责任公司 | A kind of method that sub-synchronous oscillation suppression is realized based on grid-connection converter control |
| CN107732939A (en) * | 2017-10-19 | 2018-02-23 | 国家电网公司 | Suppression sub-synchronous oscillation control method based on voltage source type converter uneoupled control |
| CN107994825A (en) * | 2017-12-27 | 2018-05-04 | 深圳市英威腾电气股份有限公司 | A kind of oscillation suppression method, system, device and readable storage medium storing program for executing |
| CN108988394A (en) * | 2018-08-27 | 2018-12-11 | 上海电机学院 | The method of distributed generation grid-connected converter elimination mains by harmonics |
| CN109659939A (en) * | 2017-10-10 | 2019-04-19 | 株洲中车时代电气股份有限公司 | A kind of PWM control method of photovoltaic system 3-phase power converter |
| CN109802404A (en) * | 2019-01-18 | 2019-05-24 | 西安许继电力电子技术有限公司 | A kind of Whole frequency band adaptive notch filter, resonance suppressing method and system |
-
2019
- 2019-07-17 CN CN201910645896.1A patent/CN110336279B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130176751A1 (en) * | 2012-01-05 | 2013-07-11 | Ingeteam Power Technology, S.A. | Method and apparatus for controlling a frequency converter |
| CN103401242A (en) * | 2013-07-15 | 2013-11-20 | 合肥工业大学 | Multi-inverter system resonance restraining device and controlling method thereof |
| CN103887824A (en) * | 2014-04-17 | 2014-06-25 | 浙江大学 | Voltage loop ripple compensation control system and control method of photovoltaic grid-connected inverter |
| CN106300387A (en) * | 2015-06-10 | 2017-01-04 | 特变电工新疆新能源股份有限公司 | The given feed forward control method of electricity grid oscillating is dynamically suppressed based on SVG |
| CN104934991A (en) * | 2015-06-23 | 2015-09-23 | 国家电网公司 | Self-adaptive current control system of grid-connected converter for inhibiting system high-frequency oscillation |
| CN104953801A (en) * | 2015-07-17 | 2015-09-30 | 清华大学 | Harmonic current suppression device and method for voltage source grid-connected inverter |
| CN105634006A (en) * | 2016-01-15 | 2016-06-01 | 珠海格力电器股份有限公司 | Grid-connected inverter control method and system |
| CN106253279A (en) * | 2016-08-23 | 2016-12-21 | 南京亚派科技股份有限公司 | A kind of anti-resonance control algolithm being applied to active filter |
| CN106505840A (en) * | 2016-11-30 | 2017-03-15 | 云南电网有限责任公司 | A kind of grid-connected photovoltaic inverter harmonic wave management method |
| CN107221931A (en) * | 2017-06-08 | 2017-09-29 | 上海电力学院 | Z-source inverter grid-connected control method based on Active Power Filter-APF |
| CN107732961A (en) * | 2017-09-22 | 2018-02-23 | 中国南方电网有限责任公司 | A kind of method that sub-synchronous oscillation suppression is realized based on grid-connection converter control |
| CN109659939A (en) * | 2017-10-10 | 2019-04-19 | 株洲中车时代电气股份有限公司 | A kind of PWM control method of photovoltaic system 3-phase power converter |
| CN107732939A (en) * | 2017-10-19 | 2018-02-23 | 国家电网公司 | Suppression sub-synchronous oscillation control method based on voltage source type converter uneoupled control |
| CN107994825A (en) * | 2017-12-27 | 2018-05-04 | 深圳市英威腾电气股份有限公司 | A kind of oscillation suppression method, system, device and readable storage medium storing program for executing |
| CN108988394A (en) * | 2018-08-27 | 2018-12-11 | 上海电机学院 | The method of distributed generation grid-connected converter elimination mains by harmonics |
| CN109802404A (en) * | 2019-01-18 | 2019-05-24 | 西安许继电力电子技术有限公司 | A kind of Whole frequency band adaptive notch filter, resonance suppressing method and system |
Non-Patent Citations (1)
| Title |
|---|
| 李明杰: "新能源并网系统引发的复杂振荡问题及其对策研究", 《电网技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111313438A (en) * | 2020-03-31 | 2020-06-19 | 中国南方电网有限责任公司 | High-frequency oscillation suppression method and system for flexible direct current transmission system |
| CN111650617A (en) * | 2020-06-10 | 2020-09-11 | 国网湖南省电力有限公司 | Crystal oscillator frequency taming method, system and medium based on innovation weighted self-adaptive insensitive Kalman filtering |
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