CN110336305A - A kind of suitable double-fed fan motor unit participates in the improvement additional frequency control method of system frequency adjusting under short trouble - Google Patents
A kind of suitable double-fed fan motor unit participates in the improvement additional frequency control method of system frequency adjusting under short trouble Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention discloses the improvement additional frequency control methods that a kind of suitable double-fed fan motor unit for belonging to field of new energy technologies participates in system frequency adjusting under short trouble, frequency fluctuation caused by sudden load change is suitable only for for the control of DFIG unit routine additional frequency, it is difficult to meet short trouble from occurring to adjust this limitation to the frequency of trouble shooting complete procedure, present invention Wind turbines when power grid is operated normally are controlled using MPPT, when load fluctuation occurs for system, Wind turbines improve the transient stability of system frequency using conventional additional frequency control response system frequency variation, when transmission line of electricity breaks down, the changing rule of the system frequency into trouble shooting complete procedure occurs according to failure, correct the parameter in the control of DFIG unit routine additional frequency, make DFIG unit output with system frequency Variation adjustment rapidly, keeps the effective inertia damping characteristic of DFIG unit overall process, improves system frequency dynamic response characteristic.
Description
Technical field
The invention belongs to New-energy power systems and micro-capacitance sensor technical field, and in particular to a kind of suitable double-fed fan motor unit
The improvement additional frequency control method that system frequency is adjusted is participated under short trouble.
Background technique
Northwest China area wind power resources are abundant, and large-scale wind power field centralization is generated electricity by way of merging two or more grid systems, and passes through high voltage transmission line
Remote conveying is sent to load center and has become current development trend, and wind-powered electricity generation permeability, which is continuously improved, gives system safe and stable operation band
Carry out new challenge.Double fed induction generators (doubly-fed induction generator, DFIG) have generating efficiency it is high,
Frequency inverter capacity is small, the good characteristics such as decoupled active and reactive control can be achieved, it has also become main force's type of Large Scale Wind Farm Integration.So
And DFIG unit uses under frequency transducer control mode, unit rotor revolving speed and system frequency decouple, and reduce equivalent turn of system
Dynamic inertia, when permeability increase to a certain extent, will greatly weaken system frequency dynamic response capability.In fact, DFIG machine
The range of operation of group revolving speed lays in the rotation function much larger than synchronous machine in 0.7pu~1.2pu, rotor, if can pass through control
System strategy realizes the coupling of DFIG unit rotor revolving speed and mains frequency, can increase substantially mains frequency regulating power.
It controls Wind turbines and participates in system frequency modulation, usually control Wind turbines simulation synchronous machine frequency modulation characteristic is realized,
Common method has virtual inertia control and sagging control.Virtual inertia control and sagging control are controlled in Wind turbines rotor-side
System frequency change rate and variable quantity are introduced control system respectively, pass through fast power by additional frequency control module in system
It controls to adjust rotation speed change release or absorbs rotor kinetic energy, with compensation or absorption system active power Sudden Changing Rate.But inertia control
It will be using the overshoot for sacrificing frequency and transit time as cost；Sagging control coefrficient is not easy to determine, coefficient, which crosses conference, makes system very
Difficulty reaches stable state.In addition to using additional frequency control, some methods have derived the virtual inertia of DFIG unit and rotational speed regulation
And the relationship of mains frequency variation, changed by detection system frequency to adjust wind power tracking curve, but the program is in frequency
It is slow to change initial time response, for this purpose, improving on the basis of the program, pull-in frequency becomes in rotor-side control system
Change differential control, DFIG unit is made to provide effective inertial supports in frequency modulation overall process.In addition, for access weak grid
For DFIG unit because PLL dynamic behaviour influences system instability, some methods replace PLL technology real using active power controller
The synchronous operation of existing DFIG unit and power grid simultaneously provides inertia support.Also it can change the traditional detection effect of PLL, PLL made
For a part of control system, when any additional control loop is not added, by control PLL parameter regulation builtin voltage come
Control the inertia of DFIG unit.Blower be normally operated in maximum power tracing (Maximum Power Point Tracking,
MPPT) mode lacks spare capacity, increases the virtual inertia of blower and is only capable of participating in system frequency modulation in short-term.To expand Wind turbines ginseng
With the time scale of frequency modulation, Wind turbines can be made in positive reason in conjunction with hypervelocity method or variable pitch method on the basis of additional frequency controls
Off-load is run under condition, is obtained certain spare capacity and is participated in system primary frequency modulation.Wherein, variable pitch method response speed is relatively slow and there are machines
Tool abrasion, limits its engineer application, so that hypervelocity method becomes first choice under conditions of meeting off-load level.But reserve spare appearance
Amount limitation Wind turbines operate normally active power output, influence its economy and practicability.
Summary of the invention
The control strategy proposed in the studies above is mostly frequency variation caused by disturbing for system loading, in addition to this,
There are also line short faults for the common disturbance for causing system frequency to significantly change: when short trouble occurs for ultra-high-tension power transmission line
When, sending end will appear short-time rating surplus, and when trouble shooting route restore operate normally when, system to sending end power demand again
Instantaneous to increase, the unbalanced power during this will cause sending frequency fluctuation in short-term.For the situation, the present invention
Have extensively studied transmission line short-circuit fault occur, in development and trouble shooting overall process DFIG unit using conventional additional frequency
The inertia damping characteristic of control, thus analyzes the limitation of conventional additional frequency control, and proposes DFIG machine on this basis
The improvement additional frequency control strategy that group is adjusted with system frequency.The strategy is sent out when transmission line of electricity breaks down according to failure
The changing rule of the raw system frequency into trouble shooting complete procedure corrects the ginseng in the control of DFIG unit routine additional frequency
Number makes DFIG unit output change adjustment rapidly with system frequency, improves power system transient stability.
The invention mainly comprises two parts, first part is the limitation point of the conventional additional frequency control under short trouble
Analysis.Under conventional additional frequency control model, failure occurs, the inertia of DFIG unit damps in development and trouble shooting overall process
On the basis of characteristic is with frequency Variation Features, the strategy is analyzed for the limitation that failure overall process lower frequency is adjusted, routine
Additional frequency control is suitable for frequency fluctuation caused by sudden load change, it is difficult to it is complete to trouble shooting from occurring to meet short trouble
The frequency of process is adjusted.
Second part is to propose a kind of suitable double-fed fan motor unit to participate in changing for system frequency adjusting under short trouble
Into additional frequency control method.The limitation adjusted in line short fault overall process frequency is controlled for conventional additional frequency,
It is proposed that wind power plant participates in the improvement additional frequency control strategy that system frequency is adjusted, when power grid operates normally, Wind turbines are used
MPPT control；When load fluctuation occurs for system, Wind turbines are improved using conventional additional frequency control response system frequency variation
The transient stability of system frequency；When short trouble occurs for transmission line of electricity, using additional frequency control strategy is improved, according to route
Failure corrects the ginseng in the control of DFIG unit routine additional frequency to normal operation overall process system frequency changing rule is restored
Number keeps the effective inertia damping characteristic of DFIG unit overall process, changes adjustment power output rapidly with system frequency, improves system
Frequency dynamic response characteristic.
The beneficial effects of the present invention are:
First, sending end frequency mutation analysis: in the case of DFIG unit is controlled without additional frequency, system is controlled using MPPT,
Frequency fluctuation amplitude is maximum, and frequency highest rises maximum during failure, and the minimum decline of frequency is more after failure removal；In contrast,
The peak excursion of frequency is inhibited using the control of conventional additional frequency to a certain extent, frequency highest amplitude has been during failure
It reduces, maximum frequency deviation is reduced during frequency rises, and frequency lowest amplitude improves after failure removal, and frequency is maximum during declining
Frequency departure is reduced, and DFIG unit plays apparent inertia supporting function in frequency dynamic change procedure；It is attached using improving
After adding frequency control, DFIG unit is in time adjusted after failure removal route restores to operate normally to be stored in revolving speed release rotor
Kinetic energy increases active output, weakens frequency offset effectively, the frequency shift (FS) compared with using conventional additional frequency control
Amount substantially reduces, and compared with first two method, this method obviously weakens hunting of frequency trend in the frequency modulation later period, keeps system fast
Speed tends towards stability.
Second, secondary power mutation analysis: when no additional frequency controls, secondary power 0；Using conventional additional frequency control
In the case where system, in the case of improving additional frequency control, after short trouble excision, frequency departure is by positive peak
Landing is until being 0, secondary power Δ P caused by sagging control during this1From just becoming negative, so that total secondary power is in failure
The moment of excision is increased to positive number by the negative of conventional additional control, and the increase of active reference value adjusts DFIG unit in time to turn
Quick-release puts kinetic energy, increases the active output of unit.
Third, DFIG unit active power of output mutation analysis: during frequency discontinuity, DFIG when no additional frequency controls
Unit operates in MPPT mode, and the fluctuation of active power of output small range changes almost without response system frequency.Using conventional attached
DFIG unit makes its output power follow active power rapidly by secondary power signal after adding frequency control, short trouble to occur
Reference value variation, moment reduce, and output power reduction causes revolving speed to increase, and blower is made to deviate the overspeed of MPPT mode, increase
Rotor kinetic energy storage level, and there are certain spare capacities；After failure removal, secondary power signal made on output power moment
It rises, is still below mechanical output, the active demand that the system that is unable to satisfy instantaneously increases, subsequent active power output gradually rises, until electricity
Magnetic power is greater than the mechanical output of capture, and it is active that revolving speed begins to decline release.When using improving additional frequency control, failure removal
Afterwards, secondary power signal makes output power moment rise above the mechanical output of capture, and revolving speed moment, which declines, discharges kinetic energy, is
Active power is replenished in time in system.
4th, DFIG generating unit speed mutation analysis: when DFIG unit is controlled without additional frequency, to keep optimal blade tip speed
Than revolving speed is only adjusted with the variation of wind speed, cannot respond to system frequency variation, and revolving speed maintains 1pu always.Using routine
In the case of additional frequency control, blower can response system frequency variation adjustment revolving speed, revolving speed rises with system frequency during failure
And raise, absorb sending superfluous active power in short-term.However, frequency is in after failure removal route restores to operate normally
Existing downward trend, but secondary power caused by the sagging control for being still higher than rated value, and playing a leading role and frequency departure phase
Close, in the latter short time of failure removal, value and frequency change rate on the contrary, cause rotation speed of fan that still there is ascendant trend,
It is unfavorable for the fast and stable of system frequency.Conventional additional frequency control there are aiming at the problem that, improve additional frequency control can
It adjusts rotation speed of fan rapidly according to the variation tendency of system frequency, improves additional frequency control energy after frequency is begun to decline
It is enough to reduce rotor speed in time, kinetic energy is discharged for system, and active support is provided.
Detailed description of the invention
It in order to illustrate the embodiments of the present invention more clearly or technical solution, below will be in embodiment or technical solution description
Required attached drawing is briefly described.
Fig. 1 is that the improvement that a kind of suitable double-fed fan motor unit of the invention participates in system frequency adjusting under short trouble is additional
The conventional additional frequency control block diagram of control method for frequency.
Fig. 2 is that the improvement that a kind of suitable double-fed fan motor unit of the invention participates in system frequency adjusting under short trouble is additional
The improvement additional frequency control block diagram of control method for frequency.
Fig. 3 is that the improvement that a kind of suitable double-fed fan motor unit of the invention participates in system frequency adjusting under short trouble is additional
The sagging control algolithm implementation flow chart of the improvement of control method for frequency.
Specific embodiment
Invention is further described with reference to the accompanying drawing.
The conventional additional frequency control method of double-fed fan motor unit is basis of the invention, such as Fig. 1 routine additional frequency control
Shown in block diagram processed, ωrFor rotor speed；PrefFor maximum power tracing mode lower rotor part side current transformer active power reference value；Δ
F is system frequency f and rated frequency fNDeviation.Additional active power isIt is converted into class
The form for being similar to the conventional synchronous generator amature equation of motion isFrequency modulation auxiliary power includes two parts:
ΔP1Synchronous generator active power static characteristic is simulated, when deviation occurs in system frequency, the variation of unit response frequency increases
Hair is with frequency departure item in the active power of proportionate relationship；ΔP2Synchronous generator inertial response characteristic is simulated, when system frequency
When rate changes, unit adjusts rotation speed change, injection or absorption and frequency differential item is in the active power of proportionate relationship.Additional frequency
While control makes DFIG unit that sagging control characteristic be presented, it is also equipped with the inertia for being similar to synchronous machine rotor.When differential controls
COEFFICIENT KdWhen > 0, the rotator inertia similar with synchronous machine is generated, differential control is also known as inertia control；As proportional control factor Kp
When > 0, can increase damped coefficient improves frequency dynamic responding ability, and ratio control is also known as sagging control.Due to feedback signal
Difference, inertia control and sagging control and regulation process are different.Inertia control is transient process, is feedback with frequency change rate
Signal is mainly used for damped frequency and quickly changes, therefore initial time occurs in disturbance and can provide larger active support, in frequency
For Near The Extreme Point frequency change rate close to zero, active support is weaker；In contrast, sagging control additional signal and frequency departure phase
It closes, is a steady-state process in most cases, be mainly used for abatement system frequency departure, but temporary caused by respectively being disturbed by power grid
In state frequency change procedure, sagging control has been more damping action, is provided about stronger active support in frequency most value point,
And it is weaker that initial time supporting role occurs in disturbance, so that it, which controls speed, is slower than inertia control.Effectively combine inertia control
Rapidity and sagging control duration, can make system all have good dynamic frequency characteristic in entire perturbation process.
Electric system power generation and electricity consumption Real-time Balancing, when system frequency varies widely, Synchronous generator revolving speed
It with system frequency close-coupled, can timely respond to, discharge or absorb the variation of rotor kinetic energy damping system frequency, especially disturbance just
Phase, generator inertia directly affect system frequency change rate even system stability.The equation of rotor motion of synchronous generator are as follows:H is generating set inertia constant；Δ ω=ω-ω0, ω is practical angular rate, ω0For volume
Determine angular rate；PMFor mechanical output；PEFor electromagnetic power；D is damped coefficient.DFIG unit is normally operated under MPPT mode
Do not have frequency response ability, when its permeability is higher, to improve system frequency dynamic characteristic, adds usually in DFIG unit
Enter the additional frequencies controlling units such as virtual inertia control, increases system inertia.Conventional additional frequency controls concrete methods of realizing
Chirp auxiliary power on the basis of Wind turbines MPPT control, secondary power are discharged or are absorbed from rotor speedization and is dynamic
Energy.
DFIG unit is concentrated grid-connected and is transferred to load center by ultra-high-tension power transmission line, when one time in ultra-high-tension power transmission line
Three phase short circuit fault occurs for route, and releases after failure certain time and restore to operate normally, this is in the process using conventional
In the case of additional frequency control, short trouble is occurring for transmission line of electricity to during trouble shooting, and DFIG unit set end voltage occurs
Landing, sending frequency steeply rises during failure, drops rapidly after trouble shooting, uprushes, dashes forward different from load is single
Subtract and cause system frequency single down or up, short trouble can successively go through frequency raising and lowering two from occurring to releasing
Process.
During frequency rises, secondary power Δ P caused by sagging control and inertia control1With Δ P2It is negative value, makes to turn
The sub- active reference value in side becomes smaller, to control rotor acceleration, absorbs superfluous active power, reduces blower output power to damp
System frequency rises.Inertia control plays leading role in failure initial time, provides stronger power and supports, and sagging control
Weaker in the supporting role of failure initial time, as frequency departure increases, sagging control action is gradually increased.Failure removal
Afterwards, frequency is begun to decline after rising to maximum, and system instantaneously increases the active demand of sending end generating set, needs generating set
Vacancy active power is reissued in time, during this period power Δ P caused by inertia control2Zero passage becomes positive value, helps to increase
Rotor-side value and power reference, but inertial supports effect is weaker.And frequency departure is larger at this time, the power Δ P that sagging control generates1
Effect is stronger, but its value is negative, therefore total secondary power is negative value, causes rotor-side value and power reference still lower, blower is defeated
Electromagnetic power is less than the mechanical output of capture, and rotor keeps acceleration tendency, and can not discharge that kinetic energy meets that system instantaneously increases sharply has
Function demand eventually becomes positive value as frequency is gradually reduced secondary power, while rotor reduces speed now operation.
A kind of suitable double-fed fan motor unit participates in the improvement additional frequency controlling party of system frequency adjusting under short trouble
Method, after failure removal route restores to operate normally, the active demand instantaneously increased causes system frequency substantially to be fallen, if at this time
The advantage that DFIG generating unit speed adjusts quick response can be played, DFIG generating unit speed is lowered in time and discharges kinetic energy, replenishment system has
Function power shortage alleviates the frequency modulation pressure of synchronous unit, it will help the fast quick-recovery stable operation of system.DFIG unit is lowered to turn
Speed should increase rotor-side active power reference value first, and blower output electromagnetic power is made to be greater than the mechanical output of capture.Failure is cut
After beginning to decline except frequency, frequency departure lands by positive maximum value, and what is played a leading role in secondary power at this time is sagging
Control is still negative value, causes the electromagnetic power of output lower than the mechanical output of capture, and fan rotor still has acceleration tendency, not only hinders
Hinder Wind turbines quick release kinetic energy, and is further exacerbated by quickly falling for system frequency.
If beginning to decline from failure removal frequency to landing was zero period, the secondary power that sagging control generates becomes just
Value, then rotor-side value and power reference will increase moment, so that electromagnetic power is higher than the mechanical output of blower capture, to adjust wind
Machine rotor runs slowly, release kinetic energy damping system frequency decline.DFIG unit routine additional frequency under fault condition is controlled
The inertia damping characteristic analysis of strategy, for its limitation, the invention proposes improve additional frequency control strategy, the strategy root
Sagging control coefrficient is corrected according to the changing rule of system frequency in short trouble generation, development and trouble shooting complete procedure, is made
DFIG unit has effective inertia damping characteristic in the whole process, adjusts in time so that its active power output be made to change with frequency
It is whole.The implementation method for improving additional frequency control strategy is shown in that Fig. 2, core algorithm improve the specific implementation stream of sagging control algolithm
Journey is shown in that Fig. 3, e are control signal, and when system operates normally or load disturbance occurs and system frequency being caused to change, the value of e is
0, Wind turbines are using conventional additional frequency control strategy；When system occurs short trouble and frequency is caused to change, triggering control
Signal processed, the value of e become 1, and Wind turbines are using improvement additional frequency control strategy.Cause the disturbance that system frequency is sharply increased
Mainly there are load anticlimax and short trouble, load reduction can cause set end voltage to increase in short-term, and short trouble can cause generator terminal
Voltage significantly lands, and for two kinds of disturbances of differentiation, introduces set end voltage simultaneously herein and system frequency variation is used as and judges whether
The foundation of short trouble occurs, as shown in figure 3, sentencing when set end voltage amplitude is lower than 0.9pu and system frequency is higher than 50.1Hz
Determine system and short trouble occurs, the value of e becomes 1.Short trouble excision after, the value of e remains 1, when frequency begin to decline and frequency
When rate is still higher than rated value, secondary power numerical value caused by sagging control is constant, and symbol changes, until frequency is lower than volume
When definite value, the value of e becomes 0, and Wind turbines restore conventional additional frequency control.
Claims (5)
1. a kind of suitable double-fed fan motor unit participates in the improvement additional frequency control method of system frequency adjusting under short trouble,
It is characterized in that, elaborating the limitation of conventional additional frequency control, it is suitable only for frequency fluctuation caused by sudden load change, it is difficult to
Meet frequency of the short trouble from occurring trouble shooting complete procedure to adjust, after failure removal, secondary power signal makes defeated
Power moment rises out, is still below mechanical output, the active demand that the system that is unable to satisfy instantaneously increases, subsequent active power output is gradually
It increases, until electromagnetic power is greater than the mechanical output of capture, it is active that revolving speed begins to decline release.
2. a kind of suitable double-fed fan motor unit according to claim 1 participates in changing for system frequency adjusting under short trouble
Into additional frequency control method, which is characterized in that when power grid operates normally, Wind turbines are controlled using MPPT；System occurs
When load fluctuation, for Wind turbines using conventional additional frequency control response system frequency variation, the transient state for improving system frequency is steady
It is qualitative；When transmission line of electricity breaks down, the changing rule of the system frequency into trouble shooting complete procedure occurs according to failure,
The parameter in the control of DFIG unit routine additional frequency is corrected, so that DFIG unit output is changed adjustment rapidly with system frequency, mentions
High power system transient stability keeps the effective inertia damping characteristic of DFIG unit overall process, changes adjustment rapidly with system frequency
Power output improves system frequency dynamic response characteristic.
3. a kind of suitable double-fed fan motor unit according to claim 2 participates in changing for system frequency adjusting under short trouble
Into additional frequency control method, which is characterized in that DFIG unit is adjusted in time after failure removal route restores to operate normally to be turned
Quick-release puts the kinetic energy stored in rotor, increases active output, weakens frequency offset effectively, obviously cuts in the frequency modulation later period
Weak hunting of frequency trend, makes system quickly tend towards stability.
4. according to claim a kind of 2 suitable double-fed fan motor units stated participated under short trouble system frequency adjusting change
Into additional frequency control method, which is characterized in that DFIG unit makes its output by secondary power signal after short trouble occurs
Power follows active power reference value to change rapidly, and moment reduces, and output power reduction causes revolving speed to increase, and deviates blower
MPPT mode overspeed increases rotor kinetic energy storage level, and there are certain spare capacities；After short trouble excision, frequency
Rate deviation is landed by positive peak until being 0, during this secondary power caused by sagging control from just becoming negative, thus
Total secondary power is increased to positive number by the negative of conventional additional control in the moment of failure removal, and the increase of active reference value makes
DFIG unit adjusts revolving speed release kinetic energy in time, increases the active output of unit.
5. according to claim a kind of 2 suitable double-fed fan motor units stated participated under short trouble system frequency adjusting change
Into additional frequency control method, which is characterized in that adjust rotation speed of fan rapidly according to the variation tendency of system frequency, age at failure
Between revolving speed rise with system frequency and raise, absorb sending superfluous active power in short-term.The energy after frequency is begun to decline
It is enough to reduce rotor speed in time, kinetic energy is discharged for system, and active support is provided.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110890765A (en) * | 2019-11-19 | 2020-03-17 | 山东大学 | Dynamic rotating speed protection method and system for virtual inertia frequency modulation of doubly-fed wind turbine |
| CN110912158A (en) * | 2019-12-15 | 2020-03-24 | 兰州交通大学 | Multi-terminal flexible direct-current power transmission system frequency stability control method with wind power participating in frequency modulation |
| CN111092581A (en) * | 2019-12-24 | 2020-05-01 | 河北工业大学 | Model prediction control method with variable control period |
| CN111864814A (en) * | 2020-08-07 | 2020-10-30 | 华中科技大学 | Power grid frequency dynamic and power grid voltage dynamic optimization control method and device |
| CN112117768A (en) * | 2020-03-26 | 2020-12-22 | 广西大学 | Wind generating set subsection frequency modulation control method based on power tracking curve switching |
| CN113489028A (en) * | 2021-08-17 | 2021-10-08 | 中国华能集团清洁能源技术研究院有限公司 | Wind power plant primary frequency modulation control method and control system |
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