CN110350587A - Double-fed blower sub-synchronous oscillation suppression method and its system based on converter Control - Google Patents
Double-fed blower sub-synchronous oscillation suppression method and its system based on converter Control Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H02J3/386—
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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
- H02J2203/00—Indexing scheme relating to details of 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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The present invention relates to a kind of double-fed fan motor sub-synchronous oscillation suppression method based on converter Control, belongs to double-fed blower technical field, solves the problems, such as that the prior art can not effectively inhibit sub-synchronous oscillation.This method comprises the following steps: when sub-synchronous oscillation occurs for double-fed blower grid-connected system, acquiring the operation data of double-fed blower grid-connected system；Mechanism is dissipated according to the response process of double-fed blower grid-connected system under grid disturbance and double-fed blower sub-synchronous oscillation, the mapping relations between blower dynamic power variable quantity and pusher side converter Control parameter are obtained, and then obtain the aperiodic change rate of blower dynamic power；It is up to target with above-mentioned aperiodic change rate, establishes optimization model, collaboration optimization is carried out to the pusher side inverter inner loop control parameter of each blower in double-fed blower grid-connected system, to inhibit to the sub-synchronous oscillation.The present invention optimizes adjustment to double-fed fan parameter under multi-constraint condition, can effectively active control sub-synchronous oscillation generate.
Description
Technical field
The present invention relates to double-fed blower technical field more particularly to a kind of double-fed blower based on converter Control are subsynchronous
Oscillation suppression method and its system.
Background technique
When sub-synchronous oscillation phenomenon occurs in traditional double-fed blower grid-connected system, passive measures such as " cutting machine " is used mostly.With
The progress of technology, Guyuan wind field be directed to sub-synchronous oscillation, using exit in due course string mend measure destroy oscillation circuit.But it is this
Method, which needs frequently to throw, moves back string benefit, greatly reduces the service life of equipment.
Double-fed blower oscillating characteristic is influenced by many factors such as wind speed, blower position, converter Control parameters, due to wind
Speed is generally viewed as uncontrollable amount with blower position, proves through researcher's a large number of experiments, converter Control is in sub-synchronous oscillation master
Dynamic control process plays decisive role.
But according to existing research achievement, domestic and international expert inhibits the research of strategy to be concentrated mainly on benefit for sub-synchronous oscillation
Inhibit sub-synchronous oscillation with power electronic equipment, or inhibits secondary by redesigning or improving itself inverter of double-fed blower
Synchronized oscillation, the latter need not add other equipment, be a kind of very economical method, but effect is not satisfactory.
Summary of the invention
In view of above-mentioned analysis, it is subsynchronous that the embodiment of the present invention is intended to provide a kind of double-fed blower based on converter Control
Oscillation suppression method and its system, to solve the problems, such as that the prior art can not effectively inhibit sub-synchronous oscillation.
On the one hand, the embodiment of the invention provides a kind of double-fed fan motor sub-synchronous oscillation inhibition side based on converter Control
Method includes the following steps:
When sub-synchronous oscillation occurs for double-fed blower grid-connected system, the operation data of double-fed blower grid-connected system is acquired；
According to the response process of double-fed blower grid-connected system under grid disturbance and double-fed blower sub-synchronous oscillation transmitter
Reason obtains the mapping relations between blower dynamic power variable quantity and pusher side converter Control parameter, and then obtains blower dynamic
The aperiodic change rate of energy and the relationship of the operation data；
It is up to target with the aperiodic change rate of blower dynamic power, establishes optimization model, simultaneously to double-fed blower
The pusher side inverter inner loop control parameter of each blower carries out collaboration optimization in net system, to press down to the sub-synchronous oscillation
System.
Above-mentioned technical proposal has the beneficial effect that: for by key parameter (pusher side converter Control parameter) and it is random because
Plain (operation data of double-fed blower grid-connected system) is introduced into blower dynamic power, and the double-fed blower constructed under multi-constraint condition changes
Flow device parameter optimization strategy, the final active control for realizing sub-synchronous oscillation.It is proved through a large number of experiments, above-mentioned technical proposal can
Collaboration optimization properly and efficiently is carried out to all blower inverter parameters in wind power plant inside, effectively inhibits the grid-connected system of double-fed blower
There is sub-synchronous oscillation in system.
Further improvement based on the above method, the operation data of the double-fed blower grid-connected system include: stator side sense
Answer the virtual value I of electric current0, stator side induced voltage virtual value U0, stator self inductance Ls, rotor self-induction Lr, rotor mutual inductance Lm, wind
Machine rotor rotational speed omegar, blower grid entry point voltage phasor U, blower grid entry point electric current phasor I, blower grid entry point useful work P, blower
Grid entry point idle work Q, blower generator rotor angle δ, blower grid entry point fundamental frequency f；
The pusher side inverter inner loop control parameter includes: pusher side Inverter circuit inner ring integral coefficient KI2And proportionality coefficient
KP2。
The beneficial effect of above-mentioned further improvement scheme is: abundant to examine in the case where sub-synchronous oscillation signal disturbance
Consider the influence of converter Control link, emphasis carries out collaboration optimization to each blower pusher side inverter inner loop control parameter.
Further, the mapping relations between the blower dynamic power variable quantity and pusher side converter Control parameter
Wherein
ω2=ω1+ωr-ωs, ω3=ωs-ωr, ωs=2 π f
In formula, Us、Respectively to blower grid entry point voltage phasor U carry out Harmonic Decomposition acquisition fundamental frequency voltages amplitude,
Initial phase,For the Fundamental-frequency Current initial phase for carrying out Harmonic Decomposition acquisition to blower grid entry point current vector I, KI1、KP1Respectively
Pusher side converter power outer ring integral coefficient and proportionality coefficient, KI2、KP2Respectively pusher side Inverter circuit inner ring integral coefficient and
Proportionality coefficient, ωrFor fan rotor rotation speed, RrFor fan rotor resistance.
The beneficial effect of above-mentioned further improvement scheme is: above-mentioned blower dynamic power variable quantity and pusher side converter Control
Mapping relations between parameter are a set of empirical equations that inventor passes through that a large number of experiments sums up, and the formula is simple and easy, can
It is contacted with accurately and effectively setting up blower dynamic power variable quantity with pusher side converter Control parameter.
Further, the aperiodic change rate of the blower dynamic power is
The beneficial effect of above-mentioned further improvement scheme is: the aperiodic change rate of above-mentioned blower dynamic power is inventor
The empirical equation summed up by a large number of experiments, control effect is good, can sufficiently meet design requirement.Also, blower dynamic energy
The aperiodic change rate of amount can also be further used as whether capableing of the judgment basis of active control sub-synchronous oscillation, i.e., described non-
, can be with active control when periodic component change rate is less than 0, it, can not active control when being more than or equal to 0.
Further, the optimization model includes wind power plant parameter optimization objective function and the constraint of wind power plant parameter optimization
Condition, wherein
The wind power plant parameter optimization objective function is
The wind power plant parameter optimization constraint condition is
In formula, h is system variable, including blower grid entry point voltage phasor U, blower grid entry point useful work P, blower grid entry point
Idle work Q, blower generator rotor angle δ, blower grid entry point fundamental frequency f；hmin、hmaxFor system variable upper and lower limit；K is control to be adjusted
Variable processed, including pusher side Inverter circuit inner ring integral coefficient KI2And Proportional coefficient KP2；Kmin、KmaxIt is upper and lower for control variable
Limit, PiIndicate the useful work of connected i-th branch of blower grid entry point；QiIndicate the nothing of connected i-th branch of blower grid entry point
Hard.
The beneficial effect of above-mentioned further improvement scheme is: to inhibit sub-synchronous oscillation as target, having fully considered decision
The constraint condition that the constraint condition and system operational parameters met needed for variable itself should meet is guaranteeing to adjust control ginseng
While number is to inhibit oscillation, blower fundamental frequency characteristic is not deteriorated.
Further, the pusher side inverter inner loop control parameter to each blower in double-fed blower grid-connected system is assisted
Further comprise following steps with optimization:
Using control variable to be adjusted as set element, decision set is established；
Decision set initial value is obtained, determines whether to meet wind power plant parameter optimization constraint condition；If conditions are not met, pressing
Preset rules in the formula of face change decision set initial value, judge again, and acquisition meets wind power plant parameter optimization constraint condition
All decision set numerical value
KP2-n+1=KP2-n-εP
KI2-n+1=KI2-n-εI
In formula, KP2-n+1Indicate K next timeP2, KP2-nIndicate last KP2, n expression the number of iterations；εPFor KP2Change
Change step-length, εIFor KP2Change step；
According to wind power plant parameter optimization objective function, following broad object function p is establishedi
It finds out in all decision set of above-mentioned acquisition, so that broad object function piMaximum, and piThe decision set of > 0
Numerical value, as pusher side inverter inner loop control parameter to be asked.
The beneficial effect of above-mentioned further improvement scheme is: using iterative algorithm, enables decision variable in decision set not
Break towards the maximum direction change of objective function value is made, improves the performance of optimization algorithm, improve user satisfaction.
On the other hand, the embodiment of the invention provides a kind of, and the double-fed blower sub-synchronous oscillation based on converter Control inhibits
System, comprising:
Data acquisition module, for when sub-synchronous oscillation occurs for double-fed blower grid-connected system, acquisition double-fed blower to be grid-connected
The operation data of system, and transmit it to energy-parameters relationship module and parameter optimization module；
Energy-parameters relationship module, for according to the response process of double-fed blower grid-connected system under grid disturbance and double
It presents blower sub-synchronous oscillation and dissipates mechanism, obtain the mapping between blower dynamic power variable quantity and pusher side converter Control parameter
Relationship, and then obtain the aperiodic change rate of blower dynamic power and the relationship of the operation data；
Parameter optimization module establishes optimization model, to double-fed for being up to target with above-mentioned aperiodic change rate
The pusher side inverter inner loop control parameter of each blower carries out collaboration optimization in blower grid-connected system, to the sub-synchronous oscillation
Inhibited.
The beneficial effect of above-mentioned technical proposal is: being used for key parameter (pusher side converter Control parameter) and enchancement factor
(operation data of double-fed blower grid-connected system) is introduced into blower dynamic power, constructs the double-fed blower change of current under multi-constraint condition
Device parameter optimization strategy, the final active control for realizing sub-synchronous oscillation.It is proved through a large number of experiments, above-mentioned technical proposal can be just
Collaboration optimization really and effectively is carried out to all blower inverter parameters in wind power plant inside, effectively inhibits double-fed blower grid-connected system
There is sub-synchronous oscillation.
Further improvement based on above system, the energy-parameters relationship module further comprises:
Frequency analysis module is obtained for carrying out Harmonic Decomposition respectively to blower grid entry point voltage phasor U and current vector I
Obtain the amplitude U of fundamental frequency voltagess, initial phaseAnd the initial phase of Fundamental-frequency CurrentThe result of acquisition is transmitted to disturbance point
Measure analysis module；
Disturbance component analysis module, for according to stator side induced current virtual value I in double-fed blower grid-connected system0And sense
Answer voltage effective value U0, in conjunction with the U of above-mentioned acquisitions、Blower dynamic power variation delta W is obtained by following formula
With the mapping relations between pusher side converter Control parameter, the mapping relations are transmitted to sub-synchronous oscillation control module
Wherein
ω2=ω1+ωr-ωs, ω3=ωs-ωr, ωs=2 π f, ω1=2 π f1
In formula, KI1、KP1Respectively pusher side Inverter circuit outer ring integral coefficient and proportionality coefficient, KI2、KP2Respectively pusher side
Inverter circuit inner ring integral coefficient and proportionality coefficient；ωrFor fan rotor rotation speed, RrFor fan rotor resistance；f1For to blower
Grid entry point current vector I carries out the frequency of the sub-synchronous oscillation current disturbing signal of Harmonic Decomposition acquisition；
Sub-synchronous oscillation control module, for obtaining the aperiodic variation of blower dynamic power according to above-mentioned mapping relations
Rate, the aperiodic change rate can be characterized by following formula
And then according to formula above judge whether can active control sub-synchronous oscillation sentence when the formulae results are less than 0
Surely can active control sub-synchronous oscillation, be transmitted to parameter optimization module for the formulae results as aperiodic change rate, it is no
Then, judgement can not active control, change pusher side inverter inner loop control parameter values, judge again.
Beneficial effect using above-mentioned further improvement scheme is: above-mentioned blower dynamic power variation delta W is changed with pusher side
The aperiodic change rate of mapping relations, blower dynamic power between stream device control parameter is that inventor is total by a large number of experiments
The empirical equation born, control effect is good, can sufficiently meet design requirement, promotes user satisfaction.Also, blower dynamic energy
The aperiodic change rate of amount as whether capableing of the judgment basis (sub-synchronous oscillation stability criterion) of active control sub-synchronous oscillation,
Determine very effect it is good, solve the problems, such as in the prior art to can active control sub-synchronous oscillation be not easy to judge.
Further, the parameter optimization module further comprises:
Decision set generation module, for being set with control variable to be adjusted in pusher side inverter inner loop control parameter
Element establishes decision set, generates decision set initial value and is transmitted to preliminary screening module；
Preliminary screening module, for according to the decision set initial value of acquisition and the operation number of double-fed blower grid-connected system
According to determining whether following wind power plant parameter optimization constraint condition is true
In formula, h is system variable, including blower grid entry point voltage phasor U, blower grid entry point useful work P, blower grid entry point
Idle work Q, blower generator rotor angle δ, blower grid entry point fundamental frequency f；hmin、hmaxFor system variable upper and lower limit；K is control to be adjusted
Variable processed, including pusher side Inverter circuit inner ring integral coefficient KI2And Proportional coefficient KP2；Subscript n indicates the number of iterations；
KP2,min、KP2,max、KI2,min、KI2,maxTo control variable upper and lower limit；PiIndicate having for connected i-th branch of blower grid entry point
Hard；QiIndicate the idle work of connected i-th branch of blower grid entry point；
If invalid, change decision set initial value by preset rules, resurvey data, judge again, until obtaining
All decision set numerical value that wind power plant parameter optimization constraint condition must be met, transmit it to optimized parameter module；
Optimized parameter module, for establishing following broad object function p according to wind power plant parameter optimization objective functioni
It finds out in all decision set of above-mentioned acquisition, so that the piMaximum and piThe decision set numerical value of > 0, as
Pusher side inverter inner loop control parameter to be asked.
Beneficial effect using above-mentioned further improvement scheme is: using iterative algorithm, the decision in decision set is enabled to become
Amount improves the performance of optimization algorithm, improves user satisfaction constantly towards the maximum direction change of objective function value is made.
Further, the preset rules are
KP2-n+1=KP2-n-εP
KI2-n+1=KI2-n-εI
In formula, KP2-n+1For K next timeP2, KP2-nFor last KP2, n is the number of iterations, εPFor KP2Change step,
εIFor KP2Change step.
Beneficial effect using above-mentioned further improvement scheme is: decision variable can be searched for by assigned direction meets constraint item
Thus the value of part reduces algorithm operation time and improves computational efficiency.
It in the present invention, can also be combined with each other between above-mentioned each technical solution, to realize more preferred assembled schemes.This
Other feature and advantage of invention will illustrate in the following description, also, certain advantages can become from specification it is aobvious and
It is clear to, or understand through the implementation of the invention.The objectives and other advantages of the invention can pass through institute in specification and attached drawing
It is achieved and obtained in the content particularly pointed out.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is double-fed blower grid-connected system composition schematic diagram；
Fig. 2 is 1 double-fed fan motor sub-synchronous oscillation suppression method step schematic diagram of the embodiment of the present invention；
Fig. 3 is that 3 double-fed fan motor sub-synchronous oscillation of the embodiment of the present invention inhibits composition schematic diagram；
Fig. 4 is 4 energy of the embodiment of the present invention-parameters relationship module composition schematic diagram；
Fig. 5 is 4 parameter optimization module composition schematic diagram of the embodiment of the present invention.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention, it is not intended to limit the scope of the present invention.
It may include that more sets form identical blower fan control system by taking double-fed blower grid-connected system as shown in Figure 1 as an example
(illustratively being depicted in Fig. 1 a set of).Every set blower fan control system includes that double-fed blower (including stator, rotor), pusher side change
Device, net side inverter, step-up transformer, capacitor, transmission line of electricity, Infinite bus system are flowed, connection relationship is as shown in Figure 1.
Double-fed blower grid-connected system sub-synchronous oscillation dissipates mechanism: when double-fed blower is concatenated, compensation is grid-connected, and string is reissued out
Sub-synchronous oscillation energy be greater than blower consumption sub-synchronous oscillation energy when, double-fed blower be concatenated compensation grid-connected system it is equivalent
To continuously send out sub-synchronous oscillation energy, sub-synchronous oscillation will be induced at this time, and equivalent system shows as negative resistance character.
The effect of generator-side converter wear: by stator-flux-oriented vector control, to control having for generator unit stator side output
Function power and reactive power, with realize maximal power point tracking and guarantee institute simultaneously power grid it is stable.
The effect of grid-side converter: grid-side converter is by being taken based on voltage, the current double closed-loop of grid voltage orientation
Control, to control the waveform of generator port voltage, electric current, makes it keep sinusoidal waveform as far as possible.
The effect of step-up transformer: blower output voltage is boosted into network voltage.
The effect of phaselocked loop: acquisition network voltage frequency (it is equivalent to blower grid entry point fundamental frequency f), phase and amplitude,
Realize that blower is synchronous between power grid.
Embodiment 1
A specific embodiment of the invention discloses a kind of double-fed fan motor sub-synchronous oscillation suppression based on converter Control
Method processed, as shown in Figure 1, including the following steps:
S1. when sub-synchronous oscillation occurs for double-fed blower grid-connected system, the operation data of double-fed blower grid-connected system is acquired；
S2. it is dissipated according to the response process of double-fed blower grid-connected system under grid disturbance and double-fed blower sub-synchronous oscillation
Mechanism obtains the mapping relations between blower dynamic power variable quantity and pusher side converter Control parameter, and then it is dynamic to obtain blower
The aperiodic change rate of state energy and the relationship of the operation data；
S3. target is up to the aperiodic change rate of blower dynamic power, establishes optimization model, to double-fed blower
The pusher side inverter inner loop control parameter of each blower carries out collaboration optimization in grid-connected system, to carry out to the sub-synchronous oscillation
Inhibit.
Compared with prior art, method provided in this embodiment is by key parameter (pusher side converter Control parameter) and random
Factor (operation data of double-fed blower grid-connected system) is introduced into blower dynamic power, constructs the double-fed blower under multi-constraint condition
Inverter parameter optimization strategy, the final active control for realizing sub-synchronous oscillation.It is proved through a large number of experiments, above-mentioned technical proposal energy
It is enough that collaboration optimization properly and efficiently is carried out to all blower inverter parameters in wind power plant inside, effectively inhibit double-fed blower grid-connected
There is sub-synchronous oscillation in system.
Embodiment 2
It improves on that basis of example 1, the operation data of double-fed blower grid-connected system includes: stator side induced current
Virtual value I0, stator side induced voltage virtual value U0, stator self inductance Ls, rotor self-induction Lr, rotor mutual inductance Lm, fan rotor
Rotational speed omegar, blower grid entry point voltage phasor U, blower grid entry point electric current phasor I, blower grid entry point useful work P, blower grid entry point
Idle work Q, blower generator rotor angle δ, blower grid entry point fundamental frequency f.
Wherein, stator side induced current virtual value I0, stator side induced voltage virtual value U0, the two can pass through prony algorithm
Handle stator side voltage and current instantaneous value, extract subsynchronous frequency current, voltage magnitude again divided byIt obtains.Useful work P and
Idle work Q can be measured by power meter, and blower generator rotor angle δ can be measured by generator built-in potential tester, blower grid entry point fundamental frequency
Frequency f can be measured with phaselocked loop.
Preferably, pusher side inverter inner loop control parameter includes: pusher side Inverter circuit inner ring integral coefficient KI2And ratio
COEFFICIENT KP2。
Preferably, the mapping relations between the blower dynamic power variable quantity and pusher side converter Control parameter
Wherein
ω2=ω1+ωr-ωs, ω3=ωs-ωr, ωs=2 π f, ω1=2 π f1
In formula, Us、Respectively to blower grid entry point voltage phasor U carry out Harmonic Decomposition acquisition fundamental frequency voltages amplitude,
Initial phase,For the Fundamental-frequency Current initial phase for carrying out Harmonic Decomposition acquisition to blower grid entry point current vector I, KI1、KP1Respectively
Pusher side converter power outer ring integral coefficient and proportionality coefficient, KI2、KP2Respectively pusher side Inverter circuit inner ring integral coefficient and
Proportionality coefficient, ωrFor fan rotor rotation speed, RrFor fan rotor resistance, f1To carry out harmonic wave to blower grid entry point current vector I
Decompose the frequency of the sub-synchronous oscillation current disturbing signal obtained.
It should be noted that f1Mechanism of production be: occur sub-synchronous oscillation when, fan stator winding is by pusher side inverter
The effect of disturbance quantity can generate secondary frequencies electric current, i.e. sub-synchronous oscillation current disturbing signal.It can be by acquiring blower grid entry point
The electric current at place, then processing acquisition is carried out by prony algorithm.The frequency range of the sub-synchronous oscillation current disturbing signal exists
2.5~50Hz.
Preferably, the aperiodic change rate of blower dynamic power can be characterized by following formula
Preferably, optimization model includes wind power plant parameter optimization objective function and wind power plant parameter optimization constraint item
Part.It is further explained below.
Wind power plant parameter optimization objective function is
Wind power plant parameter optimization constraint condition is
In formula, h is system variable, including blower grid entry point voltage phasor U, blower grid entry point useful work P, blower grid entry point
Idle work Q, blower generator rotor angle δ, blower grid entry point fundamental frequency f；hmin、hmaxFor system variable upper and lower limit；K is control to be adjusted
Variable processed, including pusher side Inverter circuit inner ring integral coefficient KI2And Proportional coefficient KP2；Kmin、KmaxIt is upper and lower for control variable
Limit, PiIndicate the useful work of connected i-th branch of blower grid entry point, QiIndicate the nothing of connected i-th branch of blower grid entry point
Hard.
Preferably, in step S3, the pusher side inverter inner loop control to each blower in double-fed blower grid-connected system
Parameter carries out collaboration optimization, further comprises following steps:
S31. using control variable to be adjusted as set element, decision set is established.
S32. decision set initial value is obtained, determines whether to meet wind power plant parameter optimization constraint condition；If conditions are not met,
Change decision set initial value by the preset rules in following formula, judge again, acquisition meets the constraint of wind power plant parameter optimization
All decision set numerical value of condition
KP2-n+1=KP2-n-εP
KI2-n+1=KI2-n-εI (6)
In formula, KP2-n+1Indicate K when (n+1)th iterationP2, KP2-nIndicate K when nth iterationP2, KI2-n+1Expression n-th+
K when 1 iterationI2, KI2-nIndicate K when nth iterationI2, n expression the number of iterations；εPFor KP2Change step, εIFor KP2's
Change step.
S33. according to wind power plant parameter optimization objective function, following broad object function p is establishedi
It finds out in all decision set of above-mentioned acquisition, so that broad object function piMaximum, and piThe decision set of > 0
Numerical value, as pusher side inverter inner loop control parameter to be asked.
Compared with Example 2, method provided in this embodiment considers sub-synchronous oscillation disturbance on the basis of energy model
Signal function analyzes the relationship between blower dynamic power variable quantity and pusher side inverter parameter, it is steady to have obtained sub-synchronous oscillation
Determine boundary condition.Double-fed blower converter Control parameter is optimized under multi-constraint condition, can effectively inhibit secondary same
Step oscillation, and it is suitable for complicated multi-computer system.
Embodiment 3
The present invention also provides a kind of double-fed blower sub-synchronous oscillations using 1 the method for embodiment to inhibit system, such as
Shown in Fig. 3 comprising data acquisition module, energy-parameters relationship module, parameter optimization module.Wherein, data acquisition module
Output end is separately connected with energy-parameters relationship module input, parameter optimization module input one, energy-parameters relationship
Module output end is connect with parameter optimization module input two.
Data acquisition module, for when sub-synchronous oscillation occurs for double-fed blower grid-connected system, acquisition double-fed blower to be grid-connected
The operation data of system, and transmit it to energy-parameters relationship module and parameter optimization module.
Energy-parameters relationship module, for according to the response process of double-fed blower grid-connected system under grid disturbance and double
It presents blower sub-synchronous oscillation and dissipates mechanism, obtain the mapping between blower dynamic power variable quantity and pusher side converter Control parameter
Relationship, and then obtain the aperiodic change rate of blower dynamic power and the relationship of the operation data.
Parameter optimization module establishes optimization model, to double-fed for being up to target with above-mentioned aperiodic change rate
The pusher side inverter inner loop control parameter of each blower carries out collaboration optimization in blower grid-connected system, to the sub-synchronous oscillation
Inhibited.
Compared with prior art, system provided in this embodiment is by key parameter (pusher side converter Control parameter) and random
Factor (operation data of double-fed blower grid-connected system) is introduced into blower dynamic power, constructs the double-fed blower under multi-constraint condition
Inverter parameter optimization strategy, the final active control for realizing sub-synchronous oscillation.It is proved through a large number of experiments, above-mentioned technical proposal energy
It is enough that collaboration optimization properly and efficiently is carried out to all blower inverter parameters in wind power plant inside, effectively inhibit double-fed blower grid-connected
There is sub-synchronous oscillation in system.
Embodiment 4
Optimize on the basis of embodiment 3, the present invention also provides a kind of double-fed blowers using 2 the method for embodiment
Sub-synchronous oscillation inhibits system, as shown in figure 4, energy-parameters relationship module further comprises sequentially connected frequency analysis mould
Block, disturbance component analysis module, sub-synchronous oscillation control module.
Frequency analysis module is obtained for carrying out Harmonic Decomposition respectively to blower grid entry point voltage phasor U and current vector I
Obtain the amplitude U of fundamental frequency voltagess, initial phaseAnd the initial phase of Fundamental-frequency CurrentThe result of acquisition is transmitted to disturbance point
Measure analysis module.Optionally, the realization of prony algorithm can be used in the Harmonic Decomposition method.
Disturbance component analysis module, for according to stator side induced current virtual value I in double-fed blower grid-connected system0And sense
Answer voltage effective value U0, in conjunction with the U of above-mentioned acquisitions、Blower dynamic power variation delta W is obtained by following formula
With the mapping relations between pusher side converter Control parameter, the mapping relations are transmitted to sub-synchronous oscillation control module
Wherein
In formula, KI1、KP1Respectively pusher side Inverter circuit outer ring integral coefficient and proportionality coefficient, KI2、KP2Respectively pusher side
Inverter circuit inner ring integral coefficient and proportionality coefficient；ωrFor fan rotor rotation speed, ω1For sub-synchronous oscillation current disturbing signal
Frequency；RrFor fan rotor resistance.
Sub-synchronous oscillation control module, for obtaining the aperiodic variation of blower dynamic power according to above-mentioned mapping relations
Rate, the aperiodic change rate can be characterized by following formula
And then according to formula above judge whether can active control sub-synchronous oscillation sentence when the formulae results are less than 0
Surely can active control sub-synchronous oscillation, be transmitted to parameter optimization module for the formulae results as aperiodic change rate, it is no
Then, judgement can not active control, change pusher side inverter inner loop control parameter values, judge again.
Preferably, as shown in figure 5, parameter optimization module further comprise sequentially connected decision set generation module, just
Walk screening module, optimized parameter module.
Decision set generation module, for being set with control variable to be adjusted in pusher side inverter inner loop control parameter
Element establishes decision set, generates decision set initial value and is transmitted to preliminary screening module.
Preliminary screening module, for according to the decision set initial value of acquisition and the operation number of double-fed blower grid-connected system
According to determining whether following wind power plant parameter optimization constraint condition is true, filters out and meets wind power plant parameter optimization constraint condition
Decision set numerical value
In formula, h is system variable, including blower grid entry point voltage phasor U, blower grid entry point useful work P, blower grid entry point
Idle work Q, blower generator rotor angle δ, blower grid entry point fundamental frequency f；hmin、hmaxFor system variable upper and lower limit；K is control to be adjusted
Variable processed, including pusher side Inverter circuit inner ring integral coefficient KI2And Proportional coefficient KP2；Subscript n indicates the number of iterations；
KP2,min、KP2,max、KI2,min、KI2,maxTo control variable upper and lower limit；PiIndicate having for connected i-th branch of blower grid entry point
Hard, QiIndicate the idle work of connected i-th branch of blower grid entry point.
Optimized parameter module, for establishing following broad object function p according to wind power plant parameter optimization objective functioni
It finds out in all decision set of above-mentioned acquisition, so that the piMaximum and piThe decision set numerical value of > 0, as
Pusher side inverter inner loop control parameter to be asked.
Preferably, the preset rules are
KP2-n+1=KP2-n-εP
KI2-n+1=KI2-n-εI (13)
In formula, KP2-n+1For K next timeP2, KP2-nFor last KP2, n is the number of iterations, εPFor KP2Change step,
εIFor KP2Change step.
Compared with Example 3, double-fed blower sub-synchronous oscillation provided in this embodiment inhibits system under multi-constraint condition
Double-fed blower converter Control parameter is optimized, sub-synchronous oscillation can be effectively inhibited, and is suitable for complicated multimachine system
System.
It will be understood by those skilled in the art that realizing all or part of the process of above-described embodiment method, meter can be passed through
Calculation machine program is completed to instruct relevant hardware, and the program can be stored in computer readable storage medium.Wherein, institute
Stating computer readable storage medium is disk, CD, read-only memory or random access memory etc..
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of double-fed fan motor sub-synchronous oscillation suppression method based on converter Control, which comprises the steps of:
When sub-synchronous oscillation occurs for double-fed blower grid-connected system, the operation data of double-fed blower grid-connected system is acquired；
Mechanism is dissipated according to the response process of double-fed blower grid-connected system under grid disturbance and double-fed blower sub-synchronous oscillation, is obtained
The mapping relations between blower dynamic power variable quantity and pusher side converter Control parameter are obtained, and then obtain blower dynamic power
The relationship of aperiodic change rate and the operation data；
It is up to target with the aperiodic change rate of blower dynamic power, establishes optimization model, to the grid-connected system of double-fed blower
The pusher side inverter inner loop control parameter of each blower carries out collaboration optimization in system, to inhibit to the sub-synchronous oscillation.
2. the double-fed fan motor sub-synchronous oscillation suppression method according to claim 1 based on converter Control, feature exist
In the operation data of the double-fed blower grid-connected system includes: the faradic virtual value I of stator side0, stator side induced voltage
Virtual value U0, stator self inductance Ls, rotor self-induction Lr, rotor mutual inductance Lm, fan rotor rotation speed ωr, blower grid entry point voltage phase
Measure U, blower grid entry point electric current phasor I, blower grid entry point useful work P, blower grid entry point idle work Q, blower generator rotor angle δ, blower simultaneously
Site fundamental frequency f；
The pusher side inverter inner loop control parameter includes: pusher side Inverter circuit inner ring integral coefficient KI2And Proportional coefficient KP2。
3. the double-fed fan motor sub-synchronous oscillation suppression method according to claim 2 based on converter Control, feature exist
In mapping relations between the blower dynamic power variable quantity and pusher side converter Control parameter
Wherein
ω2=ω1+ωr-ωs, ω3=ωs-ωr, ωs=2 π f, ω1=2 π f1
In formula, Us、Fundamental frequency voltages amplitude, the first phase of Harmonic Decomposition acquisition are respectively carried out to blower grid entry point voltage phasor U
Position,For the Fundamental-frequency Current initial phase for carrying out Harmonic Decomposition acquisition to blower grid entry point current vector I, KI1、KP1Respectively pusher side
Converter power outer ring integral coefficient and proportionality coefficient, KI2、KP2Respectively pusher side Inverter circuit inner ring integral coefficient and ratio
Coefficient, ωrFor fan rotor rotation speed, RrFor fan rotor resistance, f1To carry out Harmonic Decomposition to blower grid entry point current vector I
The frequency of the sub-synchronous oscillation current disturbing signal of acquisition.
4. the double-fed fan motor sub-synchronous oscillation suppression method according to claim 3 based on converter Control, feature exist
In the aperiodic change rate of the blower dynamic power is
5. the double-fed fan motor sub-synchronous oscillation suppression method according to claim 4 based on converter Control, feature exist
In the optimization model includes wind power plant parameter optimization objective function and wind power plant parameter optimization constraint condition, wherein
The wind power plant parameter optimization objective function is
The wind power plant parameter optimization constraint condition is
In formula, h is system variable, including blower grid entry point voltage phasor U, blower grid entry point useful work P, blower grid entry point are useless
Function Q, blower generator rotor angle δ, blower grid entry point fundamental frequency f；hmin、hmaxFor system variable upper and lower limit；K is that control to be adjusted becomes
Amount, including pusher side Inverter circuit inner ring integral coefficient KI2And Proportional coefficient KP2；Kmin、KmaxTo control variable upper and lower limit, PiTable
Show the useful work of connected i-th branch of blower grid entry point, QiIndicate the idle work of connected i-th branch of blower grid entry point.
6. the double-fed fan motor sub-synchronous oscillation suppression method according to claim 5 based on converter Control, feature exist
In the pusher side inverter inner loop control parameter to each blower in double-fed blower grid-connected system carries out collaboration optimization, into one
Step includes the following steps:
Using control variable to be adjusted as set element, decision set is established；
Decision set initial value is obtained, determines whether to meet wind power plant parameter optimization constraint condition；If conditions are not met, pressing following public affairs
Preset rules in formula change decision set initial value, judge again, obtain the institute for meeting wind power plant parameter optimization constraint condition
There is decision set numerical value
KP2-n+1=KP2-n-εP
KI2-n+1=KI2-n-εI
In formula, KP2-n+1Indicate K next timeP2, KP2-nIndicate last KP2, n expression the number of iterations；εPFor KP2Variation step
It is long, εIFor KP2Change step；
According to wind power plant parameter optimization objective function, following broad object function p is establishedi
It finds out in all decision set of above-mentioned acquisition, so that broad object function piMaximum, and piThe decision set numerical value of > 0,
As pusher side inverter inner loop control parameter to be asked.
7. a kind of double-fed blower sub-synchronous oscillation based on converter Control inhibits system characterized by comprising
Data acquisition module, for acquiring double-fed blower grid-connected system when sub-synchronous oscillation occurs for double-fed blower grid-connected system
Operation data, and transmit it to energy-parameters relationship module and parameter optimization module；
Energy-parameters relationship module, for the response process and double-fed wind according to double-fed blower grid-connected system under grid disturbance
Machine sub-synchronous oscillation dissipates mechanism, and the mapping obtained between blower dynamic power variable quantity and pusher side converter Control parameter is closed
System, and then obtain the aperiodic change rate of blower dynamic power and the relationship of the operation data；
Parameter optimization module establishes optimization model, to double-fed blower for being up to target with above-mentioned aperiodic change rate
The pusher side inverter inner loop control parameter of each blower carries out collaboration optimization in grid-connected system, to carry out to the sub-synchronous oscillation
Inhibit.
8. the double-fed blower sub-synchronous oscillation according to claim 7 based on converter Control inhibits system, feature exists
In the energy-parameters relationship module further comprises:
Frequency analysis module obtains base for carrying out Harmonic Decomposition respectively to blower grid entry point voltage phasor U and current vector I
The amplitude U of frequency voltages, initial phaseAnd the initial phase of Fundamental-frequency CurrentSub-synchronous oscillation current disturbing signal frequency f1,
The result of acquisition is transmitted to disturbance component analysis module；
Disturbance component analysis module, for according to stator side induced current virtual value I in double-fed blower grid-connected system0And induced electricity
It is pressed with valid value U0, in conjunction with the U of above-mentioned acquisitions、Blower dynamic power variation delta W and machine are obtained by following formula
The mapping relations are transmitted to sub-synchronous oscillation control module by the mapping relations between the converter Control parameter of side
Wherein
ω2=ω1+ωr-ωs, ω3=ωs-ωr, ωs=2 π f, ω1=2 π f1
In formula, KI1、KP1Respectively pusher side Inverter circuit outer ring integral coefficient and proportionality coefficient, KI2、KP2The respectively pusher side change of current
Device current inner loop integral coefficient and proportionality coefficient；ωrFor fan rotor rotation speed；RrFor fan rotor resistance.
Sub-synchronous oscillation control module, for obtaining the aperiodic change rate of blower dynamic power, institute according to above-mentioned mapping relations
Stating aperiodic change rate can be characterized by following formula
And then according to formula above judge whether can active control sub-synchronous oscillation determine energy when the formulae results are less than 0
Enough active control sub-synchronous oscillations, are transmitted to parameter optimization module for the formulae results as aperiodic change rate, otherwise, sentence
It is disconnected can not active control, change pusher side inverter inner loop control parameter values, judge again.
9. the double-fed blower sub-synchronous oscillation according to claim 8 based on converter Control inhibits system, feature exists
In the parameter optimization module further comprises:
Decision set generation module, for being set member with control variable to be adjusted in pusher side inverter inner loop control parameter
Element establishes decision set, generates decision set initial value and is transmitted to preliminary screening module；
Preliminary screening module, for according to the decision set initial value of acquisition and the operation data of double-fed blower grid-connected system,
Determine whether following wind power plant parameter optimization constraint condition is true
In formula, h is system variable, including blower grid entry point voltage phasor U, blower grid entry point useful work P, blower grid entry point are useless
Function Q, blower generator rotor angle δ, blower grid entry point fundamental frequency f；hmin、hmaxFor system variable upper and lower limit；K is that control to be adjusted becomes
Amount, including pusher side Inverter circuit inner ring integral coefficient KI2And Proportional coefficient KP2；Subscript n indicates the number of iterations；KP2,min、
KP2,max、KI2,min、KI2,maxTo control variable upper and lower limit；PiIndicate the useful work of connected i-th branch of blower grid entry point；Qi
Indicate the idle work of connected i-th branch of blower grid entry point；
If invalid, change decision set initial value by preset rules, resurvey data, judge again, until being expired
All decision set numerical value of sufficient wind power plant parameter optimization constraint condition, transmit it to optimized parameter module；
Optimized parameter module, for establishing following broad object function p according to wind power plant parameter optimization objective functioni
It finds out in all decision set of above-mentioned acquisition, so that the piMaximum and piThe decision set numerical value of > 0, as wait ask
Pusher side inverter inner loop control parameter.
10. the double-fed blower sub-synchronous oscillation according to claim 9 based on converter Control inhibits system, feature exists
In the preset rules are
KP2-n+1=KP2-n-εP
KI2-n+1=KI2-n-εI
In formula, KP2-n+1For K next timeP2, KP2-nFor last KP2, n is the number of iterations, εPFor KP2Change step, εIFor
KP2Change step.
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