CN115313369A - Method and system for controlling direct-current voltage stability of double-fed wind turbine generator - Google Patents
Method and system for controlling direct-current voltage stability of double-fed wind turbine generator Download PDFInfo
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- 238000004364 calculation method Methods 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 abstract description 13
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a method and a system for controlling the stability of direct-current voltage of a doubly-fed wind turbine generator, wherein the method comprises the following steps: when a short-circuit fault occurs in a power grid, acquiring an active current reference value of a grid-side converter generated by a direct-current voltage outer ring; introducing additional damping current according to the deviation between the direct current bus voltage reference value and the direct current bus voltage actual value; and obtaining a compensated active current instruction value of the network side converter according to the active current reference value of the network side converter and the additional damping current so as to increase the voltage damping of the direct current bus and compensate the unbalanced power. The method can obviously inhibit the voltage fluctuation of the direct-current link of the double-fed wind power grid-connected system under the short-circuit fault of the alternating-current power grid, and improve the transient stable operation capacity of the system.
Description
Technical Field
The invention relates to the technical field of double-fed wind turbine generators, in particular to a method and a system for controlling the stability of direct-current voltage of a double-fed wind turbine generator.
Background
With the gradual increase of the permeability of the wind power generation in the power system, the double-fed asynchronous induction motor is widely applied to the wind power generation system due to the advantage of small converter capacity. The double-fed asynchronous induction motor adopts a back-to-back converter to realize alternating current excitation, and the rotor-side converter and the grid-side converter exchange energy through a direct current capacitor link. Because the grid-side converter is directly connected with the power grid, when the power grid has a short-circuit fault, the interaction between the output current of the double-fed wind turbine generator and the impedance of the power grid is intensified, so that the terminal voltage of the wind turbine generator fluctuates, the side power of the direct-current bus is seriously unbalanced, the severe fluctuation of the voltage of the direct-current bus is caused, and the fault ride-through capability and the transient stability of the system are reduced. Therefore, the stability of the direct-current bus voltage of the double-fed wind turbine generator during low voltage ride through is improved, and the safe and stable operation capability of a power grid can be effectively improved. Relevant studies have been carried out by scholars at home and abroad, such as the following published documents:
[1] wuwenhua, chenyandong, luo an, a virtual inertia control strategy of a direct-current microgrid bidirectional grid-connected converter [ J ], china Motor engineering Proc, 2017,37 (02): 360-372.
[2]L.Yin,Z.Zhao,T.Lu.An Improved DC-Link Voltage Fast Control Scheme for a PWM Rectifier-Inverter System[J].IEEE Transactions on Industry Applications.2014,50(1)：462-473.
Document [1] proposes a virtual inertia control strategy for a bidirectional grid-connected converter of a direct-current microgrid, and introduces voltage-current droop control in direct-current bus voltage control by analogy with a control mode of a virtual synchronous generator, so as to increase inertia and damping characteristics of direct-current bus voltage. The literature [2] analyzes the influence of output power on the direct current bus voltage, and provides a direct current voltage stabilization control based on the angle of energy rapid balance, and the output current is controlled to be consistent with the reference current through a dead-beat prediction method so as to inhibit the fluctuation of the direct current voltage. However, the above documents are respectively directed to the study of the dc bus voltage stability under small disturbance and static scene, and the transient stability of the dc bus voltage under the condition of large disturbance is ignored, and actually, under the grid fault, there is a serious energy imbalance at the dc bus side, and the dc bus voltage fluctuates severely, so that the transient stability of the doubly-fed wind power grid-connected system under the grid fault is further deteriorated.
Disclosure of Invention
In view of the above, the invention provides a method and a system for controlling the stability of the direct-current voltage of the doubly-fed wind turbine generator, which can suppress the fluctuation of the direct-current bus voltage during the grid fault period by only changing the control strategy of the direct-current voltage loop of the grid-side converter of the doubly-fed wind turbine generator on the basis of not increasing hardware equipment, and can significantly improve the low-voltage ride through capability of the doubly-fed wind turbine grid-connected system.
The invention discloses a method for controlling the stability of direct-current voltage of a doubly-fed wind turbine generator, which comprises the following steps:
step 1: when a short-circuit fault occurs in a power grid, acquiring an active current reference value of a grid-side converter generated by a direct-current voltage outer ring;
step 2: introducing additional damping current according to the deviation between the direct current bus voltage reference value and the direct current bus voltage actual value;
and step 3: and obtaining a compensated active current instruction value of the network side converter according to the active current reference value of the network side converter and the additional damping current so as to increase the voltage damping of the direct current bus and compensate the unbalanced power.
Further, in the step 1:
and the direct-current voltage outer ring of the grid-side converter of the doubly-fed wind power grid-connected system only adopts proportion control.
Further, the step 1 comprises:
obtaining an active current reference value of the grid-side converter through the following formula:
in the formula (I), the compound is shown in the specification,
for active current reference of grid-side converterReference value, k pu Is a direct voltage control loop proportionality coefficient,
is a reference value of DC bus voltage, U dc And the feedback value is the voltage feedback value of the direct current bus.
Further, in the step 2:
the calculation formula of the additional damping current is as follows:
in the formula (I), the compound is shown in the specification,
is the absolute value of the deviation between the DC bus voltage reference value and the DC bus voltage value, delta U dc_set To adjust the coefficients.
Further, the compensated active current command value of the grid-side converter satisfies the following formula:
in the formula (I), the compound is shown in the specification,
for the compensated active current instruction value of the network side converter, s is the slip,
for the stator current command value of the doubly-fed asynchronous generator,
is slip current.
Further, the slip ratio is calculated by the following formula:
s＝(ω s -ω r )/ω s
in the formula, ω s For doubly-fed asynchronous inductionElectromechanical synchronous electrical angular velocity, omega r The rotor electrical angular velocity of the doubly-fed asynchronous induction motor.
The invention also discloses a direct-current voltage stability control system of the double-fed wind turbine generator, which comprises the following components:
the acquisition module is used for acquiring an active current reference value of the network side converter generated by the direct-current voltage outer ring when the power grid has a short-circuit fault;
the introducing module is used for introducing additional damping current according to the deviation of the direct-current bus voltage reference value and the direct-current bus voltage actual value;
and the calculation module is used for obtaining a compensated active current instruction value of the grid-side converter according to the active current reference value of the grid-side converter and the additional damping current so as to increase the voltage damping of the direct-current bus and compensate the unbalanced power.
Further, the direct-current voltage outer ring of the grid-side converter of the double-fed wind power grid-connected system in the acquisition module only adopts proportion control.
Due to the adoption of the technical scheme, the invention has the following advantages: according to the method, by improving the control strategy of the grid-side converter direct-current voltage loop of the double-fed wind turbine generator system, the damping of the direct-current side voltage can be equivalently increased during the short-circuit fault of the power grid, the unbalanced power of the direct-current side is compensated, the stable transition of the direct-current bus voltage is realized, the stability level of the direct-current bus voltage is improved, and therefore the fault ride-through capability of the double-fed wind turbine grid-connected system is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings.
FIG. 1 is a schematic diagram of a grid-connected structure of a doubly-fed wind turbine generator in the prior art;
FIG. 2 is a schematic diagram of an additional damping and power compensation strategy control architecture according to an embodiment of the present invention;
fig. 3 (a) is a simulation waveform diagram of a grid-side converter adopting a conventional control strategy in the prior art;
fig. 3 (b) is a simulation waveform diagram of a grid-side converter adopting a conventional control strategy in an embodiment of the present invention;
FIG. 4 (a) is a waveform diagram of a simulation using a conventional control strategy in the prior art;
fig. 4 (b) is a simulated waveform diagram of an additional damping and power compensation control strategy in an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, it being understood that the examples described are only some of the examples and are not intended to limit the invention to the embodiments described herein. All other embodiments available to those of ordinary skill in the art are intended to be within the scope of the embodiments of the present invention.
The transient stability control method is used for improving the transient stability of the voltage on the direct current side of the double-fed wind turbine generator. Referring to fig. 1 and fig. 2, during a symmetric short-circuit fault of a power grid, by introducing additional damping power and slip power, suppression of transient fluctuation of a dc bus voltage can be achieved, a dc bus voltage stability level is improved, and transient stable operation capability of a system is further improved.
The invention provides an embodiment of a method for controlling the stability of direct-current voltage of a double-fed wind turbine generator, which comprises the following specific steps;
a1 Direct-current voltage outer ring of a double-fed wind power grid-connected system grid-side converter during short-circuit fault of a power grid only adopts proportion control, and the grid-side converter active current reference value generated by the direct-current voltage outer ring
Calculated according to the following formula:
in the formula, k pu Is a direct current voltage control loop scaling factor,
is a reference value of DC bus voltage, U dc And the feedback value is the voltage feedback value of the direct current bus.
A2 Introducing an additional damping current i depending on the deviation of the reference value of the DC bus voltage from the actual value of the DC bus voltage D_add . The additional damping current is calculated as follows:
in the formula (I), the compound is shown in the specification,
is the absolute value of the deviation between the DC bus voltage reference value and the DC bus voltage value, delta U dc_set To adjust the coefficients.
A3 Differential current i) ss_add Calculated according to the following formula:
wherein s is slip ratio, s = (ω) s -ω r )/ω s ，ω s For synchronous electrical angular velocity, omega, of doubly-fed asynchronous induction machines r The rotor electrical angular velocity of the doubly-fed asynchronous induction motor is obtained;
the stator current command value is the stator current command value of the doubly-fed asynchronous generator.
A4 Additional damping current and slip current obtained by calculation in the step A2) and the step A3) are fed forward to an active current instruction of the network side converter, and the compensated active current instruction value of the network side converter
Satisfies the following formula:
the method can increase the voltage damping of the direct current bus and compensate the unbalanced power, so that the fluctuation of the direct current bus voltage of the double-fed wind turbine generator during low voltage ride through is restrained, and the transient stable operation capacity of the double-fed wind power grid-connected system is improved.
Fig. 3 (a) and fig. 3 (b) show simulation waveforms before and after a three-phase symmetric short-circuit fault occurs in a power grid, the voltage of a fault point drops to 0.5p.u., and a grid-side converter adopts a traditional control strategy and an additional damping and power compensation control strategy provided by the invention. And when the three-phase symmetric short circuit occurs in the power grid at 0.1s, the double-fed wind turbine generator is immediately put into a crowbar circuit and is cut off at 0.2s, and the fault duration stage is 0.1 s-0.8 s. FIG. 3 (a) shows the DC bus voltage U when using a conventional control strategy dc Dropped to 0.816p.u. and stabilized at 0.832p.u. At this time, the dc bus voltage has large fluctuation and the stable level is poor. As can be seen from FIG. 3 (b), when the strategy proposed by the present invention is adopted, U is dc After a small fluctuation, the temperature is quickly stabilized at 0.984p.u.and U is dc The minimum value only drops to 0.958p.u, and the transient process of the direct current bus voltage is obviously improved.
Fig. 4 (a) and fig. 4 (b) respectively show simulation wave diagrams before and after the grid-side converter adopts a traditional control strategy and the additional damping and power compensation control strategy provided by the invention, when the three-phase symmetric short-circuit fault occurs in the grid and the voltage of a fault point falls to 0.16p.u. It can be seen from fig. 4 (a) that the system is transiently unstable when the conventional control strategy is adopted under severe short-circuit fault. Fig. 4 (b) shows that when the strategy provided by the invention is adopted, the transient instability phenomenon of the system can be avoided, and the transient stability of the doubly-fed wind power grid-connected system is remarkably improved as the direct-current bus voltage is subjected to a rapid stability value of 0.982p.u after slight fluctuation.
Therefore, the method for controlling the direct-current voltage stability of the doubly-fed wind turbine generator set can obviously inhibit the fluctuation of the direct-current bus voltage during the short-circuit fault of the power grid, improve the voltage stability level of the direct-current bus, improve the transient stability of a doubly-fed grid-connected system under the short-circuit fault of the power grid, and improve the safe and stable operation capability of the power grid.
In addition, the invention also provides an embodiment of a direct-current voltage stabilization control system of the doubly-fed wind turbine generator, which comprises the following steps:
the acquisition module is used for acquiring an active current reference value of the network side converter generated by the direct-current voltage outer ring when the power grid has a short-circuit fault;
the introducing module is used for introducing additional damping current according to the deviation of the direct-current bus voltage reference value and the direct-current bus voltage actual value;
and the calculation module is used for obtaining a compensated active current instruction value of the grid-side converter according to the active current reference value and the additional damping current of the grid-side converter so as to increase the voltage damping of the direct-current bus and compensate the unbalanced power.
And the direct-current voltage outer ring of the grid-side converter of the doubly-fed wind power grid-connected system in the acquisition module is only controlled in proportion.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. A method for controlling the stability of direct-current voltage of a doubly-fed wind turbine generator is characterized by comprising the following steps:
step 1: when a short-circuit fault occurs in a power grid, acquiring an active current reference value of a grid-side converter generated by a direct-current voltage outer ring;
step 2: introducing additional damping current according to the deviation between the direct current bus voltage reference value and the direct current bus voltage actual value;
and step 3: and obtaining a compensated active current instruction value of the network side converter according to the active current reference value of the network side converter and the additional damping current so as to increase the voltage damping of the direct current bus and compensate the unbalanced power.
2. The method according to claim 1, characterized in that in step 1:
and the direct-current voltage outer ring of the grid-side converter of the doubly-fed wind power grid-connected system only adopts proportion control.
3. The method of claim 1, wherein step 1 comprises:
obtaining an active current reference value of the grid-side converter through the following formula:
in the formula (I), the compound is shown in the specification,
for the active current reference value, k, of the grid-side converter pu Is a direct voltage control loop proportionality coefficient,
is a reference value of DC bus voltage, U dc And the feedback value is the voltage feedback value of the direct current bus.
4. A method according to claim 3, characterized in that in step 2:
the calculation formula of the additional damping current is as follows:
in the formula (I), the compound is shown in the specification,
is the absolute value of the deviation between the DC bus voltage reference value and the DC bus voltage value, delta U dc_set To adjust the coefficients.
5. The method of claim 4, wherein the compensated grid-side converter active current command value satisfies the following equation:
in the formula (I), the compound is shown in the specification,
for the compensated active current instruction value of the network side converter, s is the slip,
for the stator current command value of the double-fed asynchronous generator,
is slip current.
6. The method of claim 5, wherein the slip is calculated by:
s＝(ω s -ω r )/ω s
in the formula, omega s For synchronous electrical angular velocity, omega, of doubly-fed asynchronous induction machines r The rotor electrical angular velocity of the doubly-fed asynchronous induction motor.
7. The utility model provides a double-fed wind turbine generator system direct current voltage stable control system which characterized in that includes:
the acquisition module is used for acquiring an active current reference value of the network-side converter generated by the direct-current voltage outer ring when the power grid has a short-circuit fault;
the introducing module is used for introducing additional damping current according to the deviation of the direct-current bus voltage reference value and the direct-current bus voltage actual value;
and the calculation module is used for obtaining a compensated active current instruction value of the grid-side converter according to the active current reference value of the grid-side converter and the additional damping current so as to increase the voltage damping of the direct-current bus and compensate the unbalanced power.
8. The system according to claim 7, wherein the doubly-fed wind power grid-connected system grid-side converter DC voltage outer loop in the acquisition module only adopts proportional control.
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| CN109980670A (en) * | 2019-02-19 | 2019-07-05 | 科诺伟业风能设备（北京）有限公司 | A kind of double-fed wind energy converter direct current bus voltage control method |
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| CN109980670A (en) * | 2019-02-19 | 2019-07-05 | 科诺伟业风能设备（北京）有限公司 | A kind of double-fed wind energy converter direct current bus voltage control method |
Non-Patent Citations (1)
| Title |
|---|
| SHIYUE CHEN等: "Transient Stability Analysis and Improved Control Strategy for DC-Link Voltage of DFIG-Based WT During LVRT", 《IEEE TRANSACTIONS ON ENERGY CONVERSION》, vol. 37, no. 2, 10 November 2021 (2021-11-10), pages 882 - 889 * |
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