CN108510121A - A kind of method and system of optimization Wind turbines pll parameter - Google Patents
A kind of method and system of optimization Wind turbines pll parameter Download PDFInfo
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Abstract
A kind of method and system of optimization Wind turbines pll parameter, including：The characteristic equation of PLL transfer function is solved, the parameter for influencing phaselocked loop response characteristic is obtained；Emulation Wind turbines phaselocked loop running environment adjusts the parameter for influencing phaselocked loop response characteristic；Phase Tracking result, which is obtained, according to emulation determines optimal pll parameter.The present invention both can preferably go out best pll parameter, in turn avoid the amplification pll parameter of blindness；Phaselocked loop Phase Tracking performance in the case of electric network voltage phase saltus step is improved, the transient characterisitics of Wind turbines are improved, on the basis of meeting phaselocked loop Phase Tracking precision, and has taken into account the convenience of parameter selection.
Description
Technical field
The present invention relates to Wind turbines fields, and in particular to it is a kind of optimization Wind turbines pll parameter method and be
System.
Background technology
In recent years, Wind Power Development is rapid, and as wind-powered electricity generation scale is increasing, proportion in the power system is constantly promoted,
Influencing each other between wind-powered electricity generation and power grid becomes increasingly complex.Main force type of the variable-speed wind-power unit as commercialized running, can be real
The decoupling control of existing active power, reactive power, improves the regulating power and stability of electric system.Variable-speed wind-power unit passes through
Back-to-back frequency converter accesses power grid, to ensure that frequency converter is run with synchronized in operational process, need to pass through phaselocked loop
(Phase Locked Loop, PLL) quick and precisely locks the phase of power grid.Currently, Wind turbines are generally using same based on locking phase
The vector control mode of step, phaselocked loop drive built-in potential phase change to realize the synchronous operation with power grid, therefore phase-locked loop performance
The transient characterisitics of speed-changing draught fan are had a major impact.
Phase-locked loop circuit is a kind of typical feedback control circuit, realizes output signal in frequency and phase from motion tracking
Input signal.In steady-state operation, electric network voltage phase variation is smaller, and phaselocked loop can easier track electric network voltage phase
Accurate locking phase is realized in variation, but in transient state, saltus step occurs for electric network voltage phase, can track phase band to phaselocked loop
Come it is difficult, Wind turbines transient characterisitics are impacted, therefore, how to solve electric network voltage phase occur saltus step to phaselocked loop with
Track phase brings difficult problem to be worth research.
Invention content
In order to solve the above-mentioned deficiency in the presence of the prior art, the present invention provides a kind of optimization Wind turbines phaselocked loop ginseng
Several method and system.The present invention carries out economics analysis and simulation analysis for the loop parameter of phaselocked loop loop filter,
Influence of the economics analysis loop parameter to phaselocked loop Phase Tracking characteristic, and emulation analysis parameter is preferably to phaselocked loop Phase Tracking
The sensitivity analysis of improvement ability improves wind-powered electricity generation in the case of electric network voltage phase saltus step to preferably go out best loop parameter
The transient state operation characteristic of unit.
Technical solution provided by the invention is：A method of optimization Wind turbines pll parameter, including：
The characteristic equation of PLL transfer function is solved, the parameter for influencing phaselocked loop response characteristic is obtained；
Emulation Wind turbines phaselocked loop running environment adjusts the parameter for influencing phaselocked loop response characteristic；
Phase Tracking result, which is obtained, according to emulation determines optimal pll parameter.
Preferably, the transmission function characteristic equation, is shown below：
s2+kps+ki=0
In formula：s：Frequency is from routing；kp：Proportionality coefficient；ki：Integral coefficient.
Preferably, the characteristic equation for solving PLL transfer function, obtains the parameter for influencing phaselocked loop response characteristic,
Including：
The characteristic equation for solving PLL transfer function, the feature of the transmission function characteristic equation is expressed by following formula
Root：
In formula：s1：The fisrt feature root of transmission function characteristic equation；s2：The second feature root of transmission function characteristic equation；
Wherein, the parameter for influencing phaselocked loop response characteristic is proportionality coefficient kpWith integral coefficient ki。
Preferably, the emulation Wind turbines phaselocked loop running environment adjusts the ginseng for influencing phaselocked loop response characteristic
Number, including：
According to phaselocked loop transient response characteristic and the parameter for influencing phaselocked loop response characteristic, phaselocked loop is established in power grid
Response expression formula under voltage-phase saltus step；
It solves the response expression formula and obtains the frequency domain character root of reaction phase-locked loop performance；
In the case where emulating Wind turbines phaselocked loop running environment according to the frequency domain character root, adjusts the influence phaselocked loop and ring
The parameter of feature is answered to obtain Phase Tracking result.
Preferably, response expression formula of the phaselocked loop under electric network voltage phase saltus step, is shown below：
In formula：Response of the phaselocked loop under electric network voltage phase saltus step；Electric network voltage phase hop value；G
(s)：The transmission function of phaselocked loop；s：Frequency is from routing；kp：Proportionality coefficient；ki：Integral coefficient.
Preferably, the frequency domain character root for solving the response expression formula and obtaining reacting phase-locked loop performance, such as following formula institute
Show：
In formula：Frequency domain character root；kp：Proportionality coefficient；ki：Integral coefficient.
Preferably, it is described in the case where emulating Wind turbines phaselocked loop running environment according to the frequency domain character root, described in adjusting
The parameter for influencing phaselocked loop response characteristic obtains Phase Tracking as a result, including：
It when saltus step occurs for phase angle in the Wind turbines phaselocked loop running environment, keeps integral coefficient constant, increases ratio
Example coefficient is until phaselocked loop response overshoot is constant, then output phase tracking result includes current proportionality coefficient；
Keep the current proportionality coefficient constant, increase integral coefficient is constant up to phaselocked loop response speed, then exports
Phase Tracking result includes current integral coefficient.
Preferably, described Phase Tracking result is obtained according to emulation to determine optimal pll parameter, including：
If the Phase Tracking result meets convergent function, proportionality coefficient and integration system in the Phase Tracking result
Number is optimal pll parameter.
Preferably, the convergent function is indicated by following formula：
In formula：The N-1 times Phase Tracking result；f(θ)：N-th Phase Tracking result curve with the N-1 times
The maximum deviation of Phase Tracking result curve；a：Preset error optimization target values；
Wherein, the maximum deviation of the n-th Phase Tracking result curve and the N-1 times result curve is indicated by following formula
f(θ)：
In formula：N-th Phase Tracking result.
Based on same inventive concept, the present invention also provides a kind of systems of optimization Wind turbines pll parameter, including：
Module is solved, the characteristic equation for solving PLL transfer function obtains the ginseng for influencing phaselocked loop response characteristic
Number；
Emulation module adjusts the ginseng for influencing phaselocked loop response characteristic for emulating Wind turbines phaselocked loop running environment
Number；
Determining module determines optimal pll parameter for obtaining Phase Tracking result according to emulation.
Preferably, the solution module, including：
First solves unit, for indicating transmission function characteristic equation by following formula：
s2+kps+ki=0
In formula：s：Frequency is from routing；kp：Proportionality coefficient；ki：Integral coefficient；
Second solves unit, and the characteristic equation for solving PLL transfer function expresses the transmission letter by following formula
The characteristic root of number characteristic equation：
In formula：s1：The fisrt feature root of transmission function characteristic equation；s2：The second feature root of transmission function characteristic equation；
Parameters unit, for determining that the parameter for influencing phaselocked loop response characteristic is proportionality coefficient kpWith integral coefficient ki。
Preferably, the emulation module, including：
Setting up submodule is used for according to phaselocked loop transient response characteristic and the parameter for influencing phaselocked loop response characteristic,
Establish response expression formula of the phaselocked loop under electric network voltage phase saltus step；
Submodule is solved, the frequency domain character root of reaction phase-locked loop performance is obtained for solving the response expression formula；
Submodule is adjusted, for, according to the frequency domain character root, being adjusted in the case where emulating Wind turbines phaselocked loop running environment
The parameter for influencing phaselocked loop response characteristic obtains Phase Tracking result.
Preferably, the adjusting submodule, including：
First adjusts unit, for when saltus step occurs for phase angle in the Wind turbines phaselocked loop running environment, keeping product
Divide coefficient constant, scaling up coefficient is until phaselocked loop response overshoot is constant, then output phase tracking result includes current
Proportionality coefficient；
Second adjusts unit, for keeping the current proportionality coefficient constant, increases integral coefficient until phaselocked loop is rung
Answer speed constant, then output phase tracking result includes current integral coefficient.
Preferably, the determining module, including：
Determination unit, if meeting convergent function, the ratio in the Phase Tracking result for the Phase Tracking result
Example coefficient and integral coefficient are optimal pll parameter；
Conditioning unit indicates the convergent function for passing through following formula：
In formula：The N-1 times Phase Tracking result；f(θ)：N-th Phase Tracking result curve with the N-1 times
The maximum deviation of Phase Tracking result curve；a：Preset error optimization target values；
It is additionally operable to indicate that the maximum of the n-th Phase Tracking result curve and the N-1 times result curve is inclined by following formula
Poor f (θ)：
In formula：N-th Phase Tracking result.
Compared with the immediate prior art, technical solution provided by the invention has the advantages that：
Technical solution provided by the invention solves the characteristic equation of PLL transfer function, and obtaining influences phaselocked loop response
The parameter of feature；Emulation Wind turbines phaselocked loop running environment adjusts the parameter for influencing phaselocked loop response characteristic；According to imitative
Really obtaining Phase Tracking result determines optimal pll parameter；Both it can preferably go out best pll parameter, in turn avoid blind
Purpose amplifies pll parameter；Electric network voltage phase generation saltus step is solved by the optimal pll parameter of determination to track to phaselocked loop
The difficulty that phase is brought.
Technical solution provided by the invention on the basis of meeting phaselocked loop Phase Tracking precision, and has taken into account parameter choosing
The convenience taken.
Technical solution provided by the invention improves phaselocked loop Phase Tracking performance in the case of electric network voltage phase saltus step,
Improve the transient characterisitics of Wind turbines.
Description of the drawings
Fig. 1 is a kind of method flow diagram of optimization Wind turbines pll parameter of the present invention；
Fig. 2 is the variable-speed wind-power unit phaselocked loop basic structure schematic diagram of the present invention；
Fig. 3 is the pll parameter preferred method flow chart based on sensitivity analysis in the embodiment of the present invention；
Fig. 4 is coordinate system transition diagram in the embodiment of the present invention；
Fig. 5 is PLL transfer function structural schematic diagram in the embodiment of the present invention；
Fig. 6 is the phaselocked loop response characteristic schematic diagram under electric network voltage phase saltus step in the embodiment of the present invention；
Fig. 7 is the phaselocked loop Phase Tracking simulation curve schematic diagram under electric network voltage phase saltus step in the embodiment of the present invention；
Fig. 8 is that simulation curve close-up schematic view is tracked in the embodiment of the present invention.
Specific implementation mode
For a better understanding of the present invention, following will be combined with the drawings in the embodiments of the present invention, in the embodiment of the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained all other embodiment, shall fall within the protection scope of the present invention.
A kind of method and system of optimization Wind turbines pll parameter are provided based on the present invention, are provided in the present embodiment
Two embodiments：
Embodiment 1
Fig. 1 is a kind of method flow diagram of optimization Wind turbines pll parameter of the present invention, as shown in Figure 1, including：
Step S101 solves the characteristic equation of PLL transfer function, obtains the parameter for influencing phaselocked loop response characteristic；
Step S102, emulation Wind turbines phaselocked loop running environment adjust the parameter for influencing phaselocked loop response characteristic；
Step S103 obtains Phase Tracking result according to emulation and determines optimal pll parameter.
Step S101 solves the characteristic equation of PLL transfer function, obtains the parameter for influencing phaselocked loop response characteristic, packet
It includes：
The transmission function characteristic equation, is shown below：
s2+kps+ki=0
In formula：s：Frequency is from routing；kp：Proportionality coefficient；ki：Integral coefficient.
The characteristic equation for solving PLL transfer function, the feature of the transmission function characteristic equation is expressed by following formula
Root：
In formula：s1：The fisrt feature root of transmission function characteristic equation；s2：The second feature root of transmission function characteristic equation；
Wherein, the parameter for influencing phaselocked loop response characteristic is proportionality coefficient kpWith integral coefficient ki。
Step S102, emulation Wind turbines phaselocked loop running environment adjust the parameter for influencing phaselocked loop response characteristic,
Including：
According to phaselocked loop transient response characteristic and the parameter for influencing phaselocked loop response characteristic, phaselocked loop is established in power grid
Response expression formula under voltage-phase saltus step；
It solves the response expression formula and obtains the frequency domain character root of reaction phase-locked loop performance；
In the case where emulating Wind turbines phaselocked loop running environment according to the frequency domain character root, adjusts the influence phaselocked loop and ring
The parameter of feature is answered to obtain Phase Tracking result.
Wherein, response expression formula of the phaselocked loop under electric network voltage phase saltus step, is shown below：
In formula：Response of the phaselocked loop under electric network voltage phase saltus step；Electric network voltage phase hop value；G
(s)：The transmission function of phaselocked loop；s：Frequency is from routing；kp：Proportionality coefficient；ki：Integral coefficient.
Further, it solves the response expression formula and obtains the frequency domain character root of reaction phase-locked loop performance, be shown below：
In formula：Frequency domain character root；kp：Proportionality coefficient；ki：Integral coefficient.
Further, the shadow is adjusted according to the frequency domain character root in the case where emulating Wind turbines phaselocked loop running environment
The parameter for ringing phaselocked loop response characteristic obtains Phase Tracking as a result, including：
It when saltus step occurs for phase angle in the Wind turbines phaselocked loop running environment, keeps integral coefficient constant, increases ratio
Example coefficient is until phaselocked loop response overshoot is constant, then output phase tracking result includes current proportionality coefficient；
Keep the current proportionality coefficient constant, increase integral coefficient is constant up to phaselocked loop response speed, then exports
Phase Tracking result includes current integral coefficient.
Step S103 obtains Phase Tracking result according to emulation and determines optimal pll parameter, including：
If the Phase Tracking result meets convergent function, proportionality coefficient and integration system in the Phase Tracking result
Number is optimal pll parameter.
Wherein, the convergent function is indicated by following formula：
In formula：The N-1 times Phase Tracking result；f(θ)：N-th Phase Tracking result curve with the N-1 times
The maximum deviation of Phase Tracking result curve；a：Preset error optimization target values；
Wherein, the maximum deviation of the n-th Phase Tracking result curve and the N-1 times result curve is indicated by following formula
f(θ)：
In formula：N-th Phase Tracking result.
Embodiment 2
Fig. 2 is typical variable-speed wind-power unit phaselocked loop basic structure schematic diagram, as shown in Fig. 2, phaselocked loop is mainly by three
A part is constituted：Phase discriminator (Phase Detector, PD), loop filter (Low Pass Filter, LPF) and voltage-controlled shakes
Swing device (Voltage Controlled Oscillator, VCO).
Phaselocked loop has a various forms of loops in practical applications, but they are all being developed by this elementary cycle
's.
Phase-locked loop operation principle is：Phase and voltage controlled oscillator output signal of the phase discriminator (PD) periodic input signal
Phase be compared, for detecting the phase difference between input signal phase and feedback signal phase.The error voltage is by ring
Path filter (LF) is filtered, loop filter can inhibit phase discriminator export noise and high-frequency signal part, it in addition to
Other than low-pass characteristic, it is often more important that it plays conclusive effect to loop parameter adjustment, to the properties of loop
Suffer from important influence.And the output of loop filter is used as controlling voltage feeding voltage controlled oscillator (VCO), voltage controlled oscillation
Device is gathered around there are one intrinsic integral element, is exported as an instantaneous phase angle.Phaselocked loop has various forms of in practical applications
Loop, but they are all being developed by this elementary cycle.PLL compared with the output signal of VCO, generates input signal
Corresponding to the voltage signal of two signal phase differences, wherein high frequency section and noise is filtered out by LPF.Above-mentioned voltage signal acts on
VCO draws VCO frequency to frequency input signal, until difference on the frequency, which is eliminated, enters lock-out state.Output signal and input at this time
Signal frequency difference is 0, and phase angle difference is fixed.
In the present embodiment, by the Wind turbines transient characterisitics in the case of research electric network voltage phase saltus step, it is based on locking phase
Impact analysis of the ring Parameters variation to Phase Tracking performance carries out susceptibility of the pll parameter preferably to phaselocked loop locking phase performance
Analysis, preferentially chooses best pll parameter, optimal phaselocked loop Phase Tracking performance is realized, to improve network voltage phase
The transient state operation characteristic of Wind turbines in the case of the saltus step of position.
Optimize the detailed process of the method for Wind turbines pll parameter in the present embodiment as shown in figure 3, including following step
Suddenly：
I, PLL transfer function model is built, transmission function parsing expression formula is established, parses transmission function characteristic equation,
The characteristic value for obtaining expression phase-locked loop performance, determines phaselocked loop key parameter；
II, theory analysis phaselocked loop transient response characteristic, establish phaselocked loop Frequency Domain Solution in the case of electric network voltage phase saltus step
Expression formula is analysed, analytic equation obtains the frequency domain character root of reaction phase-locked loop performance；
Pll parameter changes the influence to lock characteristic in the case of III, simulation analysis electric network voltage phase saltus step, carries out
Sensitivity analysis, preferably pll parameter.
Further, in the step I, PLL transfer function model is built, establishes transmission function parsing expression formula, solution
Transmission function characteristic equation is analysed, the characteristic value of expression phase-locked loop performance is obtained, determines phaselocked loop key parameter.
Variable-speed wind-power unit allocation is usually realized under synchronous rotating frame, therefore is studied under synchronous rotating frame
Phaselocked loop response characteristic.Phaselocked loop includes two parts：When Clark and Park conversion sections, second is that content ratio integral element
Reponse system, phaselocked loop is converted into positive sequence rotational coordinates by Clark and the Park three-phase voltage become in abc coordinate systems of changing commanders
Ac-dc axis voltage in system.
Fig. 4 is coordinate system transition diagram, is equal to 0 target in order to control with quadrature-axis voltage, you can control direct-axis voltage tracking
Network voltage and the phase for obtaining each phase voltage, phaselocked loop regard voltage vector as phase demodulation in quadrature axis projection, with proportional integration ring
Section is used as loop filter.
The dynamic property of phaselocked loop depends primarily on the PI parameters of loop filter.
Fig. 5 show PLL transfer function structure diagram, and loop filter generally uses PI structures, such as formula (1)
It is shown.
Wherein, s：Frequency is from routing；kp：Proportionality coefficient；ki：Integral coefficient.
The available transmission function as shown in formula (2) of phaselocked loop under typical basic structure is expressed.
Wherein, θ (s) is input signal, θe(s) it is output signal.
Then shown in the characteristic equation of PLL transfer function such as formula (3).
s2+kps+ki=0 ... ... ... ... ... ... (3)
Shown in the characteristic root of characteristic equation such as formula (4).
The response characteristic that can be seen that phaselocked loop from the characteristic root of phaselocked loop characteristic equation depends on kpAnd kiThe two ginsengs
Number.
Further, in the step II, theory analysis phaselocked loop transient response characteristic establishes electric network voltage phase saltus step
In the case of phaselocked loop frequency domain analytical expression, analytic equation obtain reaction phase-locked loop performance frequency domain character root.
When saltus step occurs for grid voltage phase-angle, the frequency-domain expression of PLL transfer function can be changed.Assuming that power grid is electric
Pressure phase angle saltus step beThen shown in the frequency expression of phase angle saltus step such as formula (5).
Shown in response of the phaselocked loop under electric network voltage phase saltus step such as formula (6).
For different proportionality coefficient kpWith integral coefficient kiIt discusses respectively, the temporary of phaselocked loop under phase angle saltus step can be obtained
Shown in state response characteristic such as formula (7).
In different proportionality coefficient kpWith integral coefficient kiThe transient response characteristic of phaselocked loop under phase angle saltus step can be obtained under value
As shown in Figure 6.
The index of phase-locked loop performance is that phaselocked loop responds overshoot and phaselocked loop response speed.
When saltus step occurs for phase angle, proportionality coefficient is smaller, and phaselocked loop response overshoot is bigger, and phase-locked loop performance is poorer, ratio
Coefficient is bigger, and phaselocked loop response overshoot is smaller, and after proportionality coefficient reaches certain numerical value, the increase of proportionality coefficient is super to phaselocked loop
The improvement of tune amount is smaller and smaller, and influence of the proportionality coefficient to phaselocked loop locking phase performance carries apparent exponential function feature；
When proportionality coefficient is identical, integral coefficient is bigger, and phaselocked loop response speed is faster, and phase-locked loop performance is better, and has
The improvement for helping phaselocked loop overshoot, after integral coefficient reaches certain numerical value, phaselocked loop can track grid phase change substantially
Change, and influence of the change of proportionality coefficient to phase-locked loop performance is no longer apparent.For proportionality coefficient, integral coefficient is to lock
The locking phase performance of phase ring influences bigger.
Further, in the step III, pll parameter variation pair in the case of simulation analysis electric network voltage phase saltus step
Sensitivity analysis, preferably pll parameter are carried out in the influence of lock characteristic.
Electric network voltage phase saltus step is set, and simulation analysis pll parameter changes the sensitivity influenced on locking phase performance, first
Integral parameter is first set as a steady state value, constantly changes scale parameter, simulation analysis phaselocked loop locking phase performance determines scale parameter
Sensitivity；
Then setting ratio parameter is a steady state value, constantly increases integral parameter, simulation analysis phaselocked loop locking phase performance, really
The sensitivity of definite integral parameter；
When scale parameter and integral parameter continue increase to phase-locked loop performance improve it is no longer apparent when, i.e., n-th phase with
When the deviation of track result and the N-1 times result is less than certain numerical value, it is believed that scale parameter and integral parameter have reached it is optimal, from
And determine best pll parameter.
Shown in the convergent function expression formula such as formula (8) of pll parameter sensitivity analysis：
Wherein,For n-th Phase Tracking result；For the N-1 times Phase Tracking result；F (θ) is
The maximum deviation of n-th Phase Tracking result curve and the N-1 times Phase Tracking result curve；A is error optimization target values, can
To set according to actual needs, such as it is set as 2% in this example.
Set integral coefficient ki=400, continuous scaling up coefficient kp, such as can successively value be 10,100,200,400,
800,1000, phaselocked loop phase locked track curve is as shown in Figure 7.Fig. 8 be the embodiment of the present invention for tracking simulation curve in Fig. 7 from
0.2s to 0.25s carries out close-up schematic view.Proportionality coefficient kpIt is worth smaller, the overshoot of phaselocked loop locking phase is bigger, locking phase effect
Fruit is poorer；Proportionality coefficient kpValue is bigger, and the effect of phaselocked loop locking phase performance is better.
And work as proportionality coefficient kpWhen value is smaller, after failure removal, when phase hit, phaselocked loop locking phase curve vibrates,
Take larger proportionality coefficient kpValue can effectively inhibit to vibrate, and improve phaselocked loop effect.But it can also be seen that work as phaselocked loop ratio
Example coefficient kpAfter value is more than 800, continue scaling up coefficient kpIt is no longer apparent to be worth the effect improved to the locking phase performance of phaselocked loop.
Such as kpWhen distinguishing value 600 and 800, f (θ)=1.612, thenMore than setting
Desired value 2%, works as kpWhen distinguishing value 800 and 1000, f (θ)=1.574, thenLess than setting
Fixed desired value 2%, thus illustrates kpWhen value 800, desired value requirement can have been met.
Same method can obtain optimal kiIt is worth, k in this exampleiOptimal is 800.Therefore, locking phase in the present embodiment is obtained
Ring optimum matching parameter is kp=800, ki=800.
Based on same invention thinking, a kind of system of optimization Wind turbines pll parameter is additionally provided in the present embodiment,
Including：
Module is solved, the characteristic equation for solving PLL transfer function obtains the ginseng for influencing phaselocked loop response characteristic
Number；
Emulation module adjusts the ginseng for influencing phaselocked loop response characteristic for emulating Wind turbines phaselocked loop running environment
Number；
Determining module determines optimal pll parameter for obtaining Phase Tracking result according to emulation.
In embodiment, the solution module, including：
First solves unit, for indicating transmission function characteristic equation by following formula：
s2+kps+ki=0
In formula：s：Frequency is from routing；kp：Proportionality coefficient；ki：Integral coefficient；
Second solves unit, and the characteristic equation for solving PLL transfer function expresses the transmission letter by following formula
The characteristic root of number characteristic equation：
In formula：s1：The fisrt feature root of transmission function characteristic equation；s2：The second feature root of transmission function characteristic equation；
Parameters unit, for determining that the parameter for influencing phaselocked loop response characteristic is proportionality coefficient kpWith integral coefficient ki。
In embodiment, the emulation module, including：
Setting up submodule is used for according to phaselocked loop transient response characteristic and the parameter for influencing phaselocked loop response characteristic,
Establish response expression formula of the phaselocked loop under electric network voltage phase saltus step；
Submodule is solved, the frequency domain character root of reaction phase-locked loop performance is obtained for solving the response expression formula；
Submodule is adjusted, for, according to the frequency domain character root, being adjusted in the case where emulating Wind turbines phaselocked loop running environment
The parameter for influencing phaselocked loop response characteristic obtains Phase Tracking result.
In embodiment, the adjusting submodule, including：
First adjusts unit, for when saltus step occurs for phase angle in the Wind turbines phaselocked loop running environment, keeping product
Divide coefficient constant, scaling up coefficient is until phaselocked loop response overshoot is constant, then output phase tracking result includes current
Proportionality coefficient；
Second adjusts unit, for keeping the current proportionality coefficient constant, increases integral coefficient until phaselocked loop is rung
Answer speed constant, then output phase tracking result includes current integral coefficient.
In embodiment, the determining module, including：
Determination unit, if meeting convergent function, the ratio in the Phase Tracking result for the Phase Tracking result
Example coefficient and integral coefficient are optimal pll parameter；
Conditioning unit indicates the convergent function for passing through following formula：
In formula：The N-1 times Phase Tracking result；f(θ)：N-th Phase Tracking result curve with the N-1 times
The maximum deviation of Phase Tracking result curve；a：Preset error optimization target values；
It is additionally operable to indicate that the maximum of the n-th Phase Tracking result curve and the N-1 times result curve is inclined by following formula
Poor f (θ)：
In formula：N-th Phase Tracking result.
It can be seen that the method that this patent uses sensitivity analysis, not only can preferably go out best pll parameter, but also keep away
The amplification pll parameter of blindness is exempted from.On the basis of meeting phaselocked loop Phase Tracking precision, and parameter selection is taken into account
Convenience.Phaselocked loop Phase Tracking performance in the case of electric network voltage phase saltus step is improved, the transient state for improving Wind turbines is special
Property.
It should be understood by those skilled in the art that, embodiments herein can be provided 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, the application can be used in one or more wherein include computer usable program code computer
The computer program production implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to method, the flow 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 can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
It these are only the embodiment of the present invention, be not intended to restrict the invention, it is all in the spirit and principles in the present invention
Within, any modification, equivalent substitution, improvement and etc. done, be all contained in apply pending scope of the presently claimed invention it
It is interior.
Claims (14)
1. a kind of method of optimization Wind turbines pll parameter, which is characterized in that including：
The characteristic equation of PLL transfer function is solved, the parameter for influencing phaselocked loop response characteristic is obtained；
Emulation Wind turbines phaselocked loop running environment adjusts the parameter for influencing phaselocked loop response characteristic；
Phase Tracking result, which is obtained, according to emulation determines optimal pll parameter.
2. the method for optimization Wind turbines pll parameter as described in claim 1, which is characterized in that the transmission function is special
Equation is levied, is shown below：
s2+kps+ki=0
In formula：s：Frequency is from routing；kp：Proportionality coefficient；ki：Integral coefficient.
3. the method for optimization Wind turbines pll parameter as claimed in claim 2, which is characterized in that the solution phaselocked loop
The characteristic equation of transmission function obtains the parameter for influencing phaselocked loop response characteristic, including：
The characteristic equation for solving PLL transfer function, the characteristic root of the transmission function characteristic equation is expressed by following formula：
In formula：s1：The fisrt feature root of transmission function characteristic equation；s2：The second feature root of transmission function characteristic equation；
Wherein, the parameter for influencing phaselocked loop response characteristic is proportionality coefficient kpWith integral coefficient ki。
4. the method for optimization Wind turbines pll parameter as described in claim 1, which is characterized in that the emulation wind turbine
Group phaselocked loop running environment adjusts the parameter for influencing phaselocked loop response characteristic, including：
According to phaselocked loop transient response characteristic and the parameter for influencing phaselocked loop response characteristic, phaselocked loop is established in network voltage
Response expression formula under phase hit；
It solves the response expression formula and obtains the frequency domain character root of reaction phase-locked loop performance；
In the case where emulating Wind turbines phaselocked loop running environment according to the frequency domain character root, it is special to adjust the influence phaselocked loop response
The parameter of sign obtains Phase Tracking result.
5. the method for optimization Wind turbines pll parameter as claimed in claim 4, which is characterized in that the phaselocked loop is in electricity
Response expression formula under net voltage-phase saltus step, is shown below：
In formula：Response of the phaselocked loop under electric network voltage phase saltus step；Electric network voltage phase hop value；G(s)：
The transmission function of phaselocked loop；s：Frequency is from routing；kp：Proportionality coefficient；ki：Integral coefficient.
6. the method for optimization Wind turbines pll parameter as claimed in claim 4, which is characterized in that described to solve the sound
It answers expression formula to obtain the frequency domain character root of reaction phase-locked loop performance, is shown below：
In formula：Frequency domain character root；kp：Proportionality coefficient；ki：Integral coefficient.
7. the method for optimization Wind turbines pll parameter as claimed in claim 6, which is characterized in that described in emulation wind-powered electricity generation
According to the frequency domain character root under unit phaselocked loop running environment, adjusts the parameter for influencing phaselocked loop response characteristic and obtain phase
Position tracking result, including：
When saltus step occurs for phase angle in the Wind turbines phaselocked loop running environment, keep integral coefficient constant, scaling up system
Number is until phaselocked loop response overshoot is constant, then output phase tracking result includes current proportionality coefficient；
Keep the current proportionality coefficient constant, increase integral coefficient is constant up to phaselocked loop response speed, then output phase
Tracking result includes current integral coefficient.
8. the method for optimization Wind turbines pll parameter as described in claim 1, which is characterized in that described according to emulating
Optimal pll parameter is determined to Phase Tracking result, including：
If the Phase Tracking result meets convergent function, the proportionality coefficient and integral coefficient in the Phase Tracking result are
Optimal pll parameter.
9. the method for optimization Wind turbines pll parameter as claimed in claim 8, which is characterized in that indicate institute by following formula
State convergent function：
In formula：The N-1 times Phase Tracking result；f(θ)：N-th Phase Tracking result curve and the N-1 times phase
The maximum deviation of tracking result curve；a：Preset error optimization target values；
Wherein, the maximum deviation f of the n-th Phase Tracking result curve and the N-1 times result curve is indicated by following formula
(θ)：
In formula：N-th Phase Tracking result.
10. a kind of system of optimization Wind turbines pll parameter, which is characterized in that including：
Module is solved, the characteristic equation for solving PLL transfer function obtains the parameter for influencing phaselocked loop response characteristic；
Emulation module adjusts the parameter for influencing phaselocked loop response characteristic for emulating Wind turbines phaselocked loop running environment；
Determining module determines optimal pll parameter for obtaining Phase Tracking result according to emulation.
11. the system of optimization Wind turbines pll parameter as claimed in claim 10, which is characterized in that the solution mould
Block, including：
First solves unit, for indicating transmission function characteristic equation by following formula：
s2+kps+ki=0
In formula：s：Frequency is from routing；kp：Proportionality coefficient；ki：Integral coefficient；
Second solves unit, and it is special to express the transmission function by following formula for the characteristic equation for solving PLL transfer function
Levy the characteristic root of equation：
In formula：s1：The fisrt feature root of transmission function characteristic equation；s2：The second feature root of transmission function characteristic equation；
Parameters unit, for determining that the parameter for influencing phaselocked loop response characteristic is proportionality coefficient kpWith integral coefficient ki。
12. the system of optimization Wind turbines pll parameter as claimed in claim 10, which is characterized in that the emulation mould
Block, including：
Setting up submodule, for according to phaselocked loop transient response characteristic and the parameter for influencing phaselocked loop response characteristic, establishing
Response expression formula of the phaselocked loop under electric network voltage phase saltus step；
Submodule is solved, the frequency domain character root of reaction phase-locked loop performance is obtained for solving the response expression formula；
Submodule is adjusted, for being built according to the frequency domain character root in the case where emulating Wind turbines phaselocked loop running environment, is adjusted
The parameter for influencing phaselocked loop response characteristic obtains Phase Tracking result.
13. the system of optimization Wind turbines pll parameter as claimed in claim 12, which is characterized in that the adjusting submodule
Block, including：
First adjusts unit, for when saltus step occurs for phase angle in the Wind turbines phaselocked loop running environment, keeping integration system
Number is constant, and scaling up coefficient is until phaselocked loop response overshoot is constant, then output phase tracking result includes current ratio
Coefficient；
Second adjusts unit, for keeping the current proportionality coefficient constant, increases integral coefficient until phaselocked loop response speed
Spend constant, then output phase tracking result includes current integral coefficient.
14. the system of optimization Wind turbines pll parameter as claimed in claim 10, which is characterized in that the determining mould
Block, including：
Determination unit, if meeting convergent function, the ratio system in the Phase Tracking result for the Phase Tracking result
Number and integral coefficient are optimal pll parameter；
Conditioning unit indicates the convergent function for passing through following formula：
In formula：The N-1 times Phase Tracking result；f(θ)：N-th Phase Tracking result curve and the N-1 times phase
The maximum deviation of tracking result curve；a：Preset error optimization target values；
It is additionally operable to indicate the maximum deviation f of the n-th Phase Tracking result curve and the N-1 times result curve by following formula
(θ)：
In formula：N-th Phase Tracking result.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111969647A (en) * | 2020-07-24 | 2020-11-20 | 南方电网科学研究院有限责任公司 | Converter transient instability stabilization control method and device based on state resetting |
| CN114115132A (en) * | 2021-10-25 | 2022-03-01 | 河北汉光重工有限责任公司 | Method and device for debugging control parameters of servo control system in non-step tracking state |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111969647A (en) * | 2020-07-24 | 2020-11-20 | 南方电网科学研究院有限责任公司 | Converter transient instability stabilization control method and device based on state resetting |
| CN114115132A (en) * | 2021-10-25 | 2022-03-01 | 河北汉光重工有限责任公司 | Method and device for debugging control parameters of servo control system in non-step tracking state |
| CN114115132B (en) * | 2021-10-25 | 2024-04-12 | 河北汉光重工有限责任公司 | Method and device for debugging control parameters of servo control system in non-step tracking state |
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