CN109861275A - A kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy - Google Patents
A kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy Download PDFInfo
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a kind of double-fed blower low-voltage ride-through methods of based superconductive magnetic storage energy of double-fed Fan Equipment technical field, and step includes: to establish superconducting magnetic energy storage system；Judge whether double feedback electric engine is in malfunction, when double feedback electric engine operates in non-faulting state, voltage source inverter is in hot stand-by duty, and energy exchange is not carried out with rotor windings, and DC-DC converter executes smooth output power；After the failure occurred, DC-DC converter carries out pressure stabilizing control to capacitor, and voltage source inverter executes transient voltage control and the control of electric current traceback, and double fed electric machine rotor side inverter executes transient voltage control and the control of electric current traceback.Present invention improves double-fed blower energy to export instability problem, while improving the low voltage ride-through capability of double-fed blower.
Description
Technical field
The present invention relates to double-fed Fan Equipment technical field, in particular to a kind of double-fed blower of based superconductive magnetic storage energy is low
Voltage ride-through method.
Background technique
Wind-power electricity generation is a kind of Distributed Renewable Energy Power System, and wind power generating set is generally by wind turbine, gear
What case, generator and its control system formed.Common wind-driven generator has mouse-cage type influence generator, double fed induction generators
And magneto alternator, wherein mouse-cage type influence generator is directly accessed power grid, and double fed induction generators stator is directly accessed
Power grid, rotor access power grid by inverter, and magneto alternator is then to access power grid by inverter.Current wind-force hair
In electric market, double-fed blower proportion is larger.With the proposition of global energy internet, the green energy resources such as wind energy, solar energy
The traditional fuel energy will be gradually replaced.In the past, when wind turbine power generation ratio is not very big, blower off-grid can also receive.With
Fan capacity is continuously increased in recent years and part is instead of conventional Power Generation Mode, therefore once have wind power plant off-grid, off-grid
Power may be quite big, this can aggravate grid power vacancy.
Since the low voltage ride-through capability of double-fed blower is weaker, when short trouble occurs, double-fed blower is because of each many
The case where parameter has all reached under failure more than maximum permissible value, it has to be disconnected with bulk power grid.After fault clearance, double-fed wind
Machine restarting, accesses power grid.This process needs certain time, if double-fed fan motor unit generated energy is in power grid in wind power plant
Middle proportion is bigger, and power grid cannot be timely connected into after fault clearance, this may cause a series of accidents such as power failure.
It is double-fed blower field two main problems urgently to be resolved that it is weak, which to export unstable and low voltage ride-through capability, for energy.
Energy exports unstable problem new energy related and all to the intrinsic characteristic that wind-power electricity generation is affected by wind speed variation
The shared problem of power generation.The weak reason of double-fed blower low voltage ride-through capability is mainly related with the connection type of itself and power grid.It is double
The stator winding of feedback blower is directly connected with power grid, generates zero sequence and negative phase-sequence magnetic when the grid collapses, in stator winding
Chain then generates the reverse induction electromotive force for being several times as much as rotor-side converter voltage output ability, to cause in the rotor
Overcurrent and over torque easily cause the damage of fan rotor side current transformer and gearbox when serious.Existing low voltage crossing side
Case is broadly divided into software scenario, hardware plan and software and hardware combining scheme three classes.Existing software controlling technique mainly has magnetoelectricity
Flow control, the control of double-current traceback etc..Software control only can preferably be protected when voltage dip is not very serious double
Blower is presented, when fatal voltage, which occurs, for power grid temporarily drops, since Converter Capacity limits, rotor-side converter is unable to complete controller
Output requirement, cause rotor-side overvoltage, overcurrent occur, the problems such as over torque occurs in double-fed blower, can not effectively realize
The operation of double-fed blower low voltage crossing, need to increase additional hardware protection measure.The existing hardware protection for single unit is arranged
Alms giver will have crow bar protection scheme, direct-current unloading circuit scheme etc..There are still part limitations for hardware protection scheme.It is mentioned above
It is unstable that scheme can not solve the problems, such as that double-fed blower operates normally lower output power；Due to the defect of hardware device itself, nothing
Method preferably solves the problems, such as the concussion etc. of each key parameter under unbalance grid failure.
Summary of the invention
Low voltage crossing is solved simultaneously it is an object of the invention to a kind of scheme of use and energy exports unstable ask
Topic improves wind farm device stability and power grid security, reliability service to solve the problems, such as that low voltage crossing provides a kind of new approaches
It is horizontal.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical schemes:
A kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy, comprising the following steps:
S1: establishing superconducting magnetic energy storage system, and system includes DC-DC converter, superconducting coil, capacitor and voltage-source type inversion
Device, superconducting coil are connected in parallel between DC-DC converter, and capacitor is connected in parallel between DC-DC converter and voltage source inverter, electricity
Potential source type inverter A, B, C phase and double-fed fan rotor side are connected in parallel；
S2: judging whether double feedback electric engine is in malfunction,
When double feedback electric engine operates in non-faulting state, two control signals of injecting voltage source type inverter are placed in 0,
The voltage source inverter for connecting double fed electric machine rotor side at this time is in hot stand-by duty, does not carry out energy friendship with rotor windings
It changes, DC-DC converter executes smooth output power,
After double feedback electric engine breaks down, DC-DC converter carries out pressure stabilizing control to capacitor, and voltage source inverter executes
Transient voltage control and the control of electric current traceback, double fed electric machine rotor side inverter executes transient voltage control and electric current is reversed
Tracing control, double fed electric machine rotor side inverter and voltage source inverter undertake the reactive current of half respectively and remove magnetoelectricity
Stream.
It further include the Collaborative Control of superconducting magnetic energy storage system Yu double-fed fan rotor side current transformer, control process are as follows:
When normal operation, super conductive magnetic storage energy voltage source inverter does not execute control, and super conductive magnetic storage energy DC-DC converter is held
The smooth output power of row；
In case of a fault, super conductive magnetic storage energy DC-DC converter execute capacitance voltage control, while rotor side inverter and
Super conductive magnetic storage energy voltage source inverter executes transient voltage control and the control of electric current traceback.
Capacitance voltage controls control process are as follows:
Input signal replaces with transient state control signal by steady state control signal, and transient state control signal is 0, at this time DC side
The shifted signal of voltage reference signal is 0, and DC-DC converter is not involved in regulation active power in case of a fault, is merely responsible for tieing up
Hold the stabilization of capacitance voltage in super conductive magnetic storage energy.
The process of smooth output power are as follows:
In non-faulting, the input signal of DC-DC converter is that the total real output of double feedback electric engine and reference are defeated
The difference of power out, input signal generate the shifted signal of DC voltage reference signal via PI controller, shifted signal and straight
Stream side voltage reference signal obtains the second DC voltage reference signal, the second DC voltage reference signal and direct current after being added
After side voltage actual signal does subtraction, output signal is generated through PI controller, output signal adds deviation, generates PWM
Signal, pwm signal input DC-DC converter, and control superconducting coil and double feedback electric engine DC side carry out energy exchange, obtain smooth
Double feedback electric engine gross output.
The range of output signal is [- 0.5,0.5], and the range of pwm signal is [0,1].
The process of transient voltage control are as follows:
After the failure occurred, the reactive power input terminal of double feedback electric engine net side circuit control device is replaced by steady state control signal
It is changed to transient controller, generator terminal reference voltage and generator terminal virtual voltage obtain voltage difference after subtracting each other, voltage difference inputs PI control
Device processed, the system that obtains need the reactive power injected, and the reactive power PI controller after clipping again obtains net side q shaft current
Reference signal.
The process of electric current traceback control are as follows:
After the failure occurred, the inverter of superconducting magnetic energy storage system and the input signal of double-fed fan rotor side inverter are same
When transient controller is switched to by steady state control signal；In transient controller, threephase stator magnetic linkage is calculated, and calculate
To the reference signal of rotor current, the reference signal of rotor current converts to obtain the d axis signal and q of transient controller through abc/dq
Axis signal, d axis signal are divided into two-way, input the first feedforward current the reference module and PI controller, the two paths of signals of output respectively
Addition obtains that treated d axis signal, meanwhile, q axis signal is divided into two-way, inputs the second feedforward current the reference module and PI respectively
Controller, the two paths of signals of output are added to obtain treated q axis signal, treated d axis signal and treated q axis signal
It converts to obtain control signal by dq/abc, control signal inputs PWM controller.
Threephase stator magnetic linkage, calculation formula is calculated are as follows:
Wherein, vsabc,isabc,Rsabc,ΨsabcRespectively represent stator voltage, electric current, resistance and magnetic linkage.
The reference signal of rotor current, calculation formula is calculated are as follows:
Wherein Ls,Lr,Lm,LRSC, σ be respectively stator inductance, inductor rotor, mutual inductance, rotor-side converter equivalent inductance and
Magnetic leakage factor.
The expression of first feedforward current the reference module formula are as follows:
The expression of second feedforward current the reference module formula are as follows:
Wherein, i* rq,i* dqIt is the d axis signal and q axis signal for converting to obtain transient controller through dq, σ is magnetic leakage factor, Lr
It is inductor rotor, RrIt is resistance value.
Compared with prior art, beneficial effects of the present invention:
1, the present invention is aided with power electronics control skill by combining superconducting magnetic energy storage and optimization double-fed air-blower control
Art, by superconducting magnetic energy storage integration in parallel connection to double-fed fan rotor winding side, while improving energy output instability problem
Improve the low voltage ride-through capability of double-fed blower.
2, super conductive magnetic storage energy side can share the overcurrent of rotor-side half and provide the reactive current of half, it is ensured that
Super conductive magnetic storage energy voltage source inverter and rotor side inverter do not occur overcurrent, therefore super conductive magnetic storage energy voltage-source type is inverse
Become device and rotor side inverter may be designed in design it is onesize so that superconducting magnetic energy storage capacity is smaller, effectively
Cost is saved, utilization rate is improved.
3, compared with prior art, the present invention can make double-fed blower have the ability that no-voltage is passed through, furthermore double-fed wind
Machine can also inject reactive power to power grid on the basis of guaranteeing that every key parameter is not out-of-limit, support the power grid electricity under failure
Pressure can satisfy grid-connected directive/guide and require the whole of double-fed blower low voltage ride-through capability.
Detailed description of the invention:
Fig. 1 is a kind of flow chart of the double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy of the present invention；
Fig. 2 is a kind of smooth output power control of the double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy of the present invention
Schematic diagram processed；
Fig. 3 is that a kind of transient voltage control of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy of the present invention is shown
It is intended to；
Fig. 4 is the electric current traceback in a kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy of the present invention
The structural schematic diagram of control；
Fig. 5 is one of embodiment 1 double-fed blower one-machine infinite-bus power system circuit diagram.
Specific embodiment
Below with reference to test example and specific embodiment, the present invention is described in further detail.But this should not be understood
It is all that this is belonged to based on the technology that the content of present invention is realized for the scope of the above subject matter of the present invention is limited to the following embodiments
The range of invention.
Embodiment 1
The embodiment of the invention provides a kind of double-fed blower low-voltage ride-through methods of based superconductive magnetic storage energy.Superconducting magnetic storage
Energy device includes DC-DC converter, superconducting coil, capacitor and voltage source inverter.Superconducting coil is connected in parallel on DC-DC converter
Between.Capacitor is connected in parallel between DC-DC converter and voltage source inverter.Voltage source inverter A, B, C phase and double-fed wind
Machine rotor side is connected in parallel.
The matched control strategy of superconducting magnetic energy storage includes transient voltage control and the control of electric current traceback；Do not occur
When short trouble, rotor side inverter is controlled by steady-state controller, and 6 switches of super conductive magnetic storage energy side inverter are set to 0, in heat
Stand-by state does not carry out Power Exchange with double-fed blower, avoids impacting double-fed blower normal operation.In network voltage event
In the case of barrier, superconducting coil is connected in parallel on double-fed blower by DC-DC converter, super conductive magnetic storage energy side inverter and filter inductance and turns
Sub- side, double-fed fan rotor side inverter and super conductive magnetic storage energy side inverter use transient state control strategy to improve double-fed blower simultaneously
Low voltage ride-through capability, and provide transient state reactive current support network voltage.
Smooth output power is as shown in Fig. 2, in non-faulting, the input signal of DC-DC converter is at this time
The total real output P of doubly fed induction generatorDFIGWith reference output power P* DFIGDifference, via PI controller generate DC side electricity
The offset signal delta V of pressure reference signaldc, with DC voltage reference signal V* dcFinal DC voltage ginseng is obtained after addition
Examine signal V’* dc, with DC voltage actual signal VdcAfter making the difference, the output that range is [- 0.5,0.5] is generated through PI controller
Signal delta D, is subject to deviation 0.5, generates the pwm signal that range is [0,1], input DC-DC converter with control superconducting coil with
Doubly fed induction generator DC side carries out energy exchange with smooth doubly fed induction generator gross output.
Transient voltage control as shown in figure 3, after the failure occurred, doubly fed induction generator net side circuit control device it is idle
Power input is by steady state control signal (Q* g=0) transient controller, generator terminal reference voltage V are replaced with* sWith generator terminal virtual voltage
VsIt makes the difference, inputs PI controller, obtain the reactive power Q that system needs to inject* g, then PI controller after clipping obtains net side
Q shaft current reference signal i* gq。
The control of electric current traceback is as shown in figure 4, after the failure occurred, superconducting magnetic energy storage inverter and double-fed blower
The input signal of rotor side inverter is simultaneously by steady state control signal (i* rdn,i* rqn) it is switched to transient controller.Transient controller
In, threephase stator magnetic linkage is first obtained by flux linkage calculation, shown in calculation formula such as formula (1).
Wherein vsabc,isabc,Rsabc,ΨsabcRespectively represent stator voltage, electric current, resistance and magnetic linkage.
Again through formula (2)
The reference signal of rotor current is obtained, wherein Ls,、Lr,、Lm,、LRSC, σ be respectively stator inductance, inductor rotor,
Mutual inductance, rotor-side converter equivalent inductance and magnetic leakage factor.It converts to obtain two control signal i of transient controller through dq* rq,
i* dq.Two control signals will also pass through two feedforward current the reference modules in addition to inputting in original controller
After two control signals are added, injection PWM controller is converted through dq/abc.
Wherein, i* rq,i* dqIt is the d axis signal and q axis signal for converting to obtain transient controller through dq, σ is magnetic leakage factor, Lr
It is inductor rotor, RrIt is resistance value.
Based on parallel shunt principle, super conductive magnetic storage energy side can share the overcurrent of rotor-side half and provide the nothing of half
Function electric current effectively reduces the overcurrent for flowing into rotor side inverter, promotes fan end voltage and protects blower interior element, from
And improve the low voltage ride-through capability of blower.
Fig. 5 is that low voltage crossing scheme provided by the invention is applied to blower-Infinite bus system circuit diagram, superconducting magnetic storage
Energy device includes transformer, filter, superconducting coil, energy storage side inverter, net side inverter, rotor side inverter.
Table 1
Table 1 is double-fed blower parameters table under power grid three phase short circuit fault, it can be seen that is using method of the invention
Afterwards, its key parameter is limited in maximum permissible value double-fed blower after the failure occurred.Wherein flow into rotor side inverter
Peak value, the electromagnetic torque peak value of electric current be limited within 2.0p.u. (per unit, per unit value), DC voltage is limited
System is within 1.2p.u..In addition, controlling by transient voltage, double-fed blower can be provided to power grid in case of a fault
The reactive power of 0.10p.u. is to support network voltage to restore.For double-fed blower, it is already possible to meet low voltage crossing
Condition, illustrate that double-fed blower low voltage ride-through capability can be improved in low voltage crossing scheme provided by the invention.
Table 2
Table 2 is double-fed blower parameters table under power grid single-phase short circuit failure, it can be seen that it is temporarily fallen in unbalance voltage,
Still can making double-fed blower using method of the invention, its key parameter is limited in maximum permissible value after the failure occurred
It is interior.Peak value, the electromagnetic torque peak value for wherein flowing into the electric current of rotor side inverter are limited in 2.0p.u. (per unit, mark
Value) within, DC voltage is limited within 1.2p.u..In addition, controlled by transient voltage, double-fed in case of a fault
Blower can provide the reactive power of 0.47p.u. to power grid to support network voltage to restore.
Claims (10)
1. a kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy, which comprises the following steps:
S1: establishing superconducting magnetic energy storage system, and the system comprises DC-DC converter, superconducting coil, capacitor and voltage-source type inversions
Device, superconducting coil are connected in parallel between DC-DC converter, and capacitor is connected in parallel between DC-DC converter and voltage source inverter, electricity
Potential source type inverter A, B, C phase and double-fed fan rotor side are connected in parallel；
S2: judging whether double feedback electric engine is in malfunction,
When double feedback electric engine operates in non-faulting state, two control signals for injecting the voltage source inverter are placed in 0,
The voltage source inverter for connecting the double fed electric machine rotor side at this time is in hot stand-by duty, does not carry out with rotor windings
Energy exchange, the DC-DC converter execute smooth output power,
After double feedback electric engine breaks down, the DC-DC converter carries out pressure stabilizing control to the capacitor, and the voltage-source type is inverse
Become device and execute transient voltage control and the control of electric current traceback, double fed electric machine rotor side inverter executes the transient voltage control
System and electric current traceback control, the double fed electric machine rotor side inverter and the voltage source inverter undertake respectively
The reactive current and demagnetizing current of half.
2. a kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy as described in claim 1, which is characterized in that also
Collaborative Control including superconducting magnetic energy storage system Yu double-fed fan rotor side current transformer, control process are as follows:
When normal operation, super conductive magnetic storage energy voltage source inverter does not execute control, and super conductive magnetic storage energy DC-DC converter executes flat
Sliding output power；
In case of a fault, super conductive magnetic storage energy DC-DC converter executes capacitance voltage control, while rotor side inverter and superconduction
Magnetic storage energy voltage source inverter executes transient voltage control and the control of electric current traceback.
3. a kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy as claimed in claim 2, which is characterized in that institute
State capacitance voltage control control process are as follows:
Input signal replaces with transient state control signal by steady state control signal, and transient state control signal is 0, at this time DC side
The shifted signal of voltage reference signal is 0, and the DC-DC converter is not involved in regulation active power in case of a fault, only bears
Duty maintains the stabilization of capacitance voltage in super conductive magnetic storage energy.
4. a kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy as claimed in claim 1 or 2, feature exist
In the process of the smooth output power are as follows:
In non-faulting, the input signal of the DC-DC converter is that the total real output of double feedback electric engine and reference are defeated
The difference of power out, the input signal generate the shifted signal of DC voltage reference signal, the offset via PI controller
Signal obtains the second DC voltage reference signal, the second DC voltage ginseng after being added with DC voltage reference signal
It examines signal and after DC voltage actual signal does subtraction, generates output signal through PI controller, the output signal adds
Upper deviation value, generates pwm signal, and the pwm signal inputs the DC-DC converter, controls the superconducting coil and duplex feeding
Machine DC side carries out energy exchange, obtains smooth double feedback electric engine gross output.
5. a kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy as claimed in claim 4, which is characterized in that institute
The range for stating output signal is [- 0.5,0.5], and the range of the pwm signal is [0,1].
6. a kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy as claimed in claim 1 or 2, feature exist
In the process of the transient voltage control are as follows:
After the failure occurred, the reactive power input terminal of double feedback electric engine net side circuit control device is replaced with by steady state control signal
Transient controller, generator terminal reference voltage and generator terminal virtual voltage obtain voltage difference, the voltage difference input PI control after subtracting each other
Device processed, the system that obtains need the reactive power injected, and the reactive power PI controller after clipping again obtains net side q axis
Current reference signal.
7. a kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy as claimed in claim 1 or 2, feature exist
In the process of the electric current traceback control are as follows:
After the failure occurred, the inverter of the superconducting magnetic energy storage system and the input signal of double-fed fan rotor side inverter are same
When transient controller is switched to by steady state control signal；In the transient controller, threephase stator magnetic linkage is calculated, and count
Calculation obtains the reference signal of rotor current, and the reference signal of the rotor current converts to obtain the d of transient controller through abc/dq
Axis signal and q axis signal, the d axis signal are divided into two-way, input the first feedforward current the reference module and PI controller respectively, defeated
Two paths of signals out is added to obtain treated d axis signal, meanwhile, the q axis signal is divided into two-way, inputs the second feedforward respectively
Current reference module and PI controller, the two paths of signals of output are added to obtain treated q axis signal, treated d axis signal
Q axis signal converts to obtain control signal by dq/abc with treated, and the control signal inputs PWM controller.
8. a kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy as claimed in claim 7, which is characterized in that institute
It states and threephase stator magnetic linkage, calculation formula is calculated are as follows:
Wherein, vsabc,isabc,Rsabc,ΨsabcRespectively represent stator voltage, electric current, resistance and magnetic linkage.
9. a kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy as claimed in claim 7, which is characterized in that institute
State the reference signal that rotor current is calculated, calculation formula are as follows:
Wherein Ls,Lr,Lm,LRSC, σ is respectively stator inductance, inductor rotor, mutual inductance, rotor-side converter equivalent inductance and leakage field
Coefficient.
10. a kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy as claimed in claim 7, which is characterized in that
The first feedforward current the reference module formula expression are as follows:
The second feedforward current the reference module formula expression are as follows:
Wherein, i* rq,i* dqIt is the d axis signal and q axis signal for converting to obtain transient controller through dq, σ is magnetic leakage factor, LrIt is to turn
Sub- inductance, RrIt is resistance value.
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| CN113489018A (en) * | 2021-06-25 | 2021-10-08 | 浙江大学 | Control method for supporting slow process voltage drop of voltage source type energy storage power station |
| CN113765146A (en) * | 2021-11-09 | 2021-12-07 | 四川大学 | Double-fed induction fan fault ride-through system and method under direct-current commutation failure |
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| CN112564162B (en) * | 2020-11-23 | 2022-09-16 | 合肥工业大学 | Double-fed generator converter circuit integrated with energy storage unit and control method |
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