CN107634537A - With reference to the wind farm voltage control method of energy storage - Google Patents
With reference to the wind farm voltage control method of energy storage Download PDFInfo
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- 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
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- Y02E10/76—Power conversion electric or electronic aspects
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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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- Y02E40/30—Reactive power compensation
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Abstract
The present invention discloses a kind of wind farm voltage control method of combination energy storage, comprises the following steps：S1：The actual voltage value of wind farm grid-connected point is measured, calculates the deviation between the target voltage values of the grid entry point and actual voltage value；S2：The dead band threshold value of voltage deviation is set, if voltage deviation is more than dead band threshold value, into step S3, otherwise return to step S1；S3：Calculate the reactive power command value of wind power plant；S4：The reactive power maximum and minimum value for the single unit that reactive power/voltage control is participated in wind power plant are calculated, calculates the reactive power maximum and minimum value of whole units that reactive power/voltage control is participated in wind power plant；S5：According to preferential regulation energy storage device reactive power, secondly the principle of regulating wind power unit reactive power, coordinated allocation is carried out by wind power plant reactive power command value between Wind turbines and energy storage device.
Description
Technical field
The invention belongs to wind power plant reactive voltage control field, more particularly to a kind of reactive power/voltage control containing energy storage device
Technology.
Background technology
Large-scale wind power accesses operation of power networks, and scheduling and control on power network bring very big influence, plus various countries' wind-powered electricity generation simultaneously
Net directive/guide proposes strict demand to integrated wind plant, such as requires that integrated wind plant should possess high-precision reactive voltage regulation energy
Power, and wind power plant reactive power be able to should automatically adjust in its range of capacity.
Wind power generating set can realize active and reactive uneoupled control in wind power plant, although single unit Reactive-power control model
Enclose small, but blower fan quantity is more in large-scale wind field, and have ignored the Reactive-power control ability of Wind turbines in actual motion substantially, makes
Wasted into Wind turbines reactive power.
At present, to solve the problems, such as the reactive power/voltage control of wind farm grid-connected point, the response speed of wind field Reactive-power control is improved,
Reactive-load compensation equipment is mounted with wind power plant, but multiple reactive-load compensation equipments lack the coordination ability, regulation is that easily occur
Oscillation.Present invention introduces energy storage device, its outstanding feature is that energy storage device can both realize no-power compensation function, instead of original
Some reactive power compensators, double weight reducings of blower fan, wind field are realized, and energy storage device can realize four quadrant running, can basis
The two-way reactive power of carry out of fast and flexible, two-way active power is needed to exchange.In the reactive power/voltage control of dispatching of power netwoks, wind
Electric field and energy storage device can participate in the reactive power/voltage control of system, suppress reactive power fluctuation, improve the stabilization of system operation
Property.Energy storage device is increasingly becoming the focus that power worker studies as current emerging problem.
The content of the invention
It is an object of the invention to solve to lack the defects of coordinating control to reactive power compensator in the prior art, there is provided one
Kind can realize that wind farm device is reduced weight, and improve the voltage stability of wind farm grid-connected point, and accurate control is realized to reactive voltage
Wind farm voltage control method.
For the above-mentioned purpose, the present invention uses following technical scheme：
A kind of wind farm voltage control method of combination energy storage, Reactive-power control is realized by introducing energy storage device, described
Method comprises the following steps：
S1：Measure the actual voltage value U of wind farm grid-connected pointmeas, calculate the target voltage values U of the grid entry pointsetWith reality
Border magnitude of voltage UmeasBetween deviation delta U, Δ U=| Uset-Umeas |；
S2：The dead band threshold value δ of voltage deviation is set, if voltage deviation Δ U is more than δ, into step S3, otherwise returns to step
Rapid S1；
S3：Calculate the reactive power command value Q of wind power plantref, Qref=Qmeas+k×(Uset-Umeas), wherein, QmeasFor wind
The reactive power instantaneous value of electric field grid entry point, k are the sensitivity coefficient of grid entry point voltage-reactive power, and it is according to live actual
Situation is adjusted；
S4：Calculate the reactive power maximum Q for the single unit that reactive power/voltage control is participated in wind power plantwt(i)maxWith it is idle
Power minimum Qwt(i)min, the reactive power maximum Q of the interior whole units for participating in reactive power/voltage control of calculating wind power plantwfmax
With reactive power minimum value Qwfmin, calculating formula is as follows：
Wherein λi+And λi-Respectively advanced, the hysteresis limits of Power Factor, P (i) are the real-time wattful power of unit
Rate；
Wherein n is the unit quantity of wind power plant.
S5：According to the reactive power maximum Q of known energy storage devicecmaxWith the reactive power minimum value of energy storage device
Qcmin, with reference to the reactive power command value Q being calculatedref, the reactive power maximum Q of whole unitswfmaxWith reactive power most
Small value Qwfmin, according to preferential regulation energy storage device reactive power, the principle of next regulating wind power unit reactive power, by wind power plant
Reactive power command value QrefCoordinated allocation is carried out between Wind turbines and energy storage device.
According to wind farm voltage control method proposed by the present invention, wherein, also include before the step S4, judge wind-powered electricity generation
The running situation of each unit, is divided into controllable blower fan and uncontrollable blower fan, wherein uncontrollable wind by the unit in wind power plant in
Machine is not involved in reactive power/voltage control；Energy storage device is divided into controllable state and uncontrollable state simultaneously, wherein in uncontrollable shape
Energy storage device is not involved in reactive power/voltage control during state.
According to wind farm voltage control method proposed by the present invention, wherein, the step S5 also includes：
Judge wind power plant reactive power command value QrefNumerical values recited, if QrefMore than 0, step S51 is performed, if QrefIt is small
In 0, step S52 is performed：
S51：If Qref＜ Qcmax, then dispatch reactive power command value and all individually undertaken by energy storage device, distribute to energy storage
The reactive power of equipment is Qref, the reactive power for distributing to wind power plant is 0；
If Qcmax＜ Qref＜ Qcmax+Qwfmax, then dispatch reactive power command value and held jointly by energy storage device and wind power plant
Load, the reactive power for distributing to energy storage device is Qcmax, the reactive power for distributing to wind power plant is Qref-Qcmax；
If Qref＞ Qcmax+Qwfmax, then Qref=Qcmax+Qwfmax, scheduling reactive power command value is by energy storage device and wind-powered electricity generation
Field shared, the reactive power for distributing to energy storage device is Qcmax, the reactive power for distributing to wind power plant is Qwfmax；
S52：If Qref＞ Qcmin, then dispatch reactive power command value and all individually undertaken by energy storage device, distribute to energy storage
The reactive power of equipment is Qref, the reactive power for distributing to wind power plant is 0；
If Qcmin+Qwfmin＜ Qref＜ Qcmin, then dispatch reactive power command value and held jointly by energy storage device and wind power plant
Load, the reactive power for distributing to energy storage device is Qcmin, the reactive power for distributing to wind power plant is Qref-Qcmin；
If Qref＜ Qcmin+Qwfmin, then Qref=Qcmin+Qwfmin, scheduling reactive power command value is by energy storage device and wind-powered electricity generation
Field shared, the reactive power for distributing to energy storage device is Qcmin, the reactive power for distributing to wind power plant is Qwfmin。
According to wind farm voltage control method proposed by the present invention, wherein, in addition to step S6：According to constant power factor point
With principle, the reactive power capacity of wind power plant will be assigned to, according to each unit active power in total active accounting and idle work(
The real-time adjustable range of rate is distributed one by one, and specific distribution principle is：
Qref(i)=Qref×P(i)÷P
Wherein Qref(i) it is the reactive power reference qref of unit, P is the total active power of fan end.
Compared with prior art, the present invention solves reactive power compensator shortage and coordinates to control, and substitutes reactive power compensator,
Realize that wind field is reduced weight, and Large Scale Wind Farm Integration access system causes grid entry point voltage pulsation and various countries' wind-electricity integration directive/guide to idle
The problems such as voltage control accuracy requirement.The present invention is idle according to preferential regulation energy storage device, and secondly regulating wind power unit is idle
Principle, reactive power is subjected to coordinated allocation, energy storage device is quickly participated in the regulation of grid-connected voltage, ensure grid entry point bus electricity
Voltage levels are in rational scope.After introducing energy storage device, original reactive-load compensation equipment can be replaced, so as to realize that wind power plant is thin
Body effect.
Brief description of the drawings
Fig. 1 is the schematic diagram of the specific embodiment of wind farm voltage control method one of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not paid
Embodiment, belong to the scope of protection of the invention.
The present invention is using wind farm grid-connected voltage as control targe, using reactive power as adjustment amount, by wind turbine
The coordination of group and energy storage device controls, and grid entry point voltage is met line voltage requirement.
As shown in figure 1, being the wind power plant reactive voltage control schematic diagram containing energy storage device, this control method includes following step
Suddenly：
(1) measuring apparatus obtains the measured value U of wind farm grid-connected voltagemeas, calculate grid entry point voltage target UsetWith electricity
It is compacted measured value UmeasDeviation delta U, Δ U=| Uset-Umeas |.
(2) the dead band threshold value of voltage deviation is set, if voltage deviation Δ U is more than, into step (3), otherwise returns to step
Suddenly (1).
(3) the reactive command value Q of wind power plant is calculatedref, Qref=Qmeas+k×(Uset-Umeas), wherein, QmeasFor wind power plant
The reactive power instantaneous value of grid entry point, k are the sensitivity coefficient of grid entry point voltage-reactive power, are entered according to on-site actual situations
Row adjustment.
(4) judge the running situation of each unit in wind power plant, be divided into controllable blower fan and uncontrollable blower fan, uncontrollable blower fan
Be not involved in reactive power/voltage control, and energy storage device is divided into controllable state and uncontrollable state, in uncontrollable state energy storage set
It is standby to be not involved in voltage control.
(5) it is idle according to preferential regulation energy storage device, next idle principle of regulating wind power unit, by the idle finger of wind power plant
Make value QrefCarry out coordinated allocation between Wind turbines and energy storage device, i.e. reactive power one-level distribution in Fig. 1.
In Fig. 1, integrated wind plant reactive requirement setting valve module is used for determining wind power plant reactive power output reference value
Link.Change of the link by comparing grid entry point voltage actual value and with reference to wind power plant reactive requirement is worth to.Pass through voltage
With idle characteristic curve, energy-storage system is obtained after idle constraint processing and wind power plant maintains the reactive power of control point voltage
Reference value, energy storage device reactive capability and unit reactive power output scope are then integrated, is preferentially compensated using energy storage device
The principle of reactive power, reactive requirement value is distributed, meet that voltage control requires to reach reactive power requirements.
Specific assigning process is as follows：
(a) the reactive power maximum Q for the single unit that reactive power/voltage control is participated in wind power plant is calculatedwt(i)maxWith it is idle
Power minimum Qwt(i)min, the reactive power maximum Q of the interior whole units for participating in reactive power/voltage control of calculating wind power plantwfmax
With reactive power minimum value Qwfmin, calculating formula is as follows：
Wherein λi+And λi-Respectively advanced, the hysteresis limits of Power Factor, P (i) are the real-time wattful power of unit
Rate；
Wherein n is the unit quantity of wind power plant.
The reactive power maximum Q of known energy storage devicecmaxWith the reactive power minimum value Q of energy storage devicecmin。
(b) Q is judgedrefIf QrefMore than 0, step (c) is performed, if QrefLess than 0, step (d) is performed.
(c) according to wind power plant, the idle adjustable extent of energy storage device, calculate and distribute to the idle of wind power plant and energy storage device
Size, determination methods are as follows:
If 1) Qref＜ Qcmax, then dispatch reactive command value and all individually undertaken by energy storage device, distribute to energy storage device
Idle is Qref, it is 0 to distribute to the idle of wind power plant；
If 2) Qcmax＜ Qref＜ Qcmax+Qwfmax, then reactive command value is dispatched by energy storage device and wind power plant shared,
It is Q to distribute to the idle of energy storage devicecmax, it is Q to distribute to the idle of wind power plantref-Qcmax；
If 3) Qref＞ Qcmax+Qwfmax, then Qref=Qcmax+Qwfmax, scheduling reactive command value is by energy storage device and wind power plant
Shared, it is Q to distribute to the idle of energy storage devicecmax, it is Q to distribute to the idle of wind power plantwfmax；
(d) according to wind power plant, the idle adjustable extent of energy storage device, calculate and distribute to the idle of wind power plant and energy storage device
Size, determination methods are as follows:
If 1) Qref＞ Qcmin, then dispatch reactive command value and all individually undertaken by energy storage device, distribute to energy storage device
Idle is Qref, and it is 0 to distribute to the idle of wind power plant；
If 2) Qcmin+Qwfmin＜ Qref＜ Qcmin, then reactive command value is dispatched by energy storage device and wind power plant shared,
It is Q to distribute to the idle of energy storage devicecmin, it is Q to distribute to the idle of wind power plantref-Qcmin；
If 3) Qref＜ Qcmin+Qwfmin, then Qref=Qcmin+Qwfmin, scheduling reactive command value is by energy storage device and wind power plant
Shared, it is Q to distribute to the idle of energy storage devicecmin, it is Q to distribute to the idle of wind power plantwfmin；
(6) according to constant power factor distribution principle, the reactive capability of wind power plant will be assigned to, according to each unit reactive power
Real-time adjustable range is distributed one by one, i.e. Wind turbines reactive power secondary distribution in Fig. 1；
Reactive power inside wind power plant is mainly according to each unit active power in always active accounting and reactive power
Real-time adjustable range is allocated, and constant power factor distribution, specific distribution are carried out to instruction reactive capability according to gained scope
Principle is：
Qref(i)=Q × P (i)/P
Wherein, Qref(i) it is the idle reference value of unit, P (i) is the real-time active power of unit, and P is that fan end always has
Work(.
(7) according to the idle allocation result between wind power plant, energy storage device and unit, to wind power plant, energy storage device and unit
Send idle control command.
After the completion of wind power plant, energy storage device and unit perform command action, return to step (1).
In summary, wind power plant voltage control scheme proposed by the present invention, energy storage device is on the one hand introduced, instead of idle benefit
Equipment is repaid, can easily realize that wind power plant is reduced weight；On the other hand idle allocation strategy is utilized, reactive power is subjected to coordinated allocation,
Energy storage device is quickly participated in the regulation of grid-connected voltage, the voltage stability of wind farm grid-connected point can be improved, so as to idle electricity
Pressure realizes accurate control.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in previous embodiment, or equivalent substitution is carried out to which part technical characteristic；And
These modifications are replaced, and the essence of appropriate technical solution is departed from the spirit and model of technical scheme of the embodiment of the present invention
Enclose.
Claims (4)
1. a kind of wind farm voltage control method of combination energy storage, realizes Reactive-power control, its feature by introducing energy storage device
It is, the described method comprises the following steps：
S1：Measure the actual voltage value U of wind farm grid-connected pointmeas, calculate the target voltage values U of the grid entry pointsetWith actual electricity
Pressure value UmeasBetween deviation delta U, Δ U=| Uset-Umeas |；
S2：The dead band threshold value δ of voltage deviation is set, if voltage deviation Δ U is more than δ, into step S3, otherwise return to step
S1；
S3：Calculate the reactive power command value Q of wind power plantref, Qref=Qmeas+k×(Uset-Umeas), wherein, QmeasFor wind power plant
The reactive power instantaneous value of grid entry point, k are the sensitivity coefficient of grid entry point voltage-reactive power, and it is according to on-site actual situations
It is adjusted；
S4：Calculate the reactive power maximum Q for the single unit that reactive power/voltage control is participated in wind power plantwt(i)maxAnd reactive power
Minimum value Qwt(i)min, the reactive power maximum Q of the interior whole units for participating in reactive power/voltage control of calculating wind power plantwfmaxAnd nothing
Work(power minimum Qwfmin, calculating formula is as follows：
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Wherein λi+And λi-Respectively advanced, the hysteresis limits of Power Factor, P (i) are the real-time active power of unit；
Wherein n is the unit quantity of wind power plant.
S5：According to the reactive power maximum Q of known energy storage devicecmaxWith the reactive power minimum value Q of energy storage devicecmin, knot
Close the reactive power command value Q being calculatedref, the reactive power maximum Q of whole unitswfmaxWith reactive power minimum value
Qwfmin, according to preferential regulation energy storage device reactive power, secondly the principle of regulating wind power unit reactive power, idle by wind power plant
Power command value QrefCoordinated allocation is carried out between Wind turbines and energy storage device.
2. wind farm voltage control method according to claim 1, it is characterised in that also include before the step S4,
Judge the running situation of each unit in wind power plant, the unit in wind power plant is divided into controllable blower fan and uncontrollable blower fan, wherein
Uncontrollable blower fan is not involved in reactive power/voltage control；Energy storage device is divided into controllable state and uncontrollable state simultaneously, wherein
Energy storage device is not involved in reactive power/voltage control during uncontrollable state.
3. wind farm voltage control method according to claim 1, it is characterised in that the step S5 also includes：
Judge wind power plant reactive power command value QrefNumerical values recited, if QrefMore than 0, step S51 is performed, if QrefLess than 0,
Perform step S52：
S51：If Qref＜ Qcmax, then dispatch reactive power command value and all individually undertaken by energy storage device, distribute to energy storage device
Reactive power be Qref, the reactive power for distributing to wind power plant is 0；
If Qcmax＜ Qref＜ Qcmax+Qwfmax, then reactive power command value is dispatched by energy storage device and wind power plant shared, distribution
Reactive power to energy storage device is Qcmax, the reactive power for distributing to wind power plant is Qref-Qcmax；
If Qref＞ Qcmax+Qwfmax, then Qref=Qcmax+Qwfmax, dispatch reactive power command value and be total to by energy storage device and wind power plant
With undertaking, the reactive power for distributing to energy storage device is Qcmax, the reactive power for distributing to wind power plant is Qwfmax；
S52：If Qref＞ Qcmin, then dispatch reactive power command value and all individually undertaken by energy storage device, distribute to energy storage device
Reactive power be Qref, the reactive power for distributing to wind power plant is 0；
If Qcmin+Qwfmin＜ Qref＜ Qcmin, then reactive power command value is dispatched by energy storage device and wind power plant shared, distribution
Reactive power to energy storage device is Qcmin, the reactive power for distributing to wind power plant is Qref-Qcmin；
If Qref＜ Qcmin+Qwfmin, then Qref=Qcmin+Qwfmin, dispatch reactive power command value and be total to by energy storage device and wind power plant
With undertaking, the reactive power for distributing to energy storage device is Qcmin, the reactive power for distributing to wind power plant is Qwfmin。
4. wind farm voltage control method according to claim 3, it is characterised in that also including step S6：According to grade work(
Rate factor distribution principle, the reactive power capacity of wind power plant will be assigned to, according to each unit active power in total active accounting
Distributed one by one with the real-time adjustable range of reactive power, specific distribution principle is：
Qref(i)=Qref×P(i)÷P
Wherein Qref(i) it is the reactive power reference qref of unit, P is the total active power of fan end.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108964083A (en) * | 2018-06-29 | 2018-12-07 | 中国电力科学研究院有限公司 | A kind of wind-powered electricity generation field control method and device |
| CN112510764A (en) * | 2020-11-26 | 2021-03-16 | 上海电气风电集团股份有限公司 | Control method and system for reactive power of wind power plant, electronic equipment and storage medium |
| CN112803429A (en) * | 2021-01-07 | 2021-05-14 | 国网湖南省电力有限公司 | Reactive voltage coordination control method and system for energy storage power station and clean energy power station |
| CN113746145A (en) * | 2020-05-28 | 2021-12-03 | 新疆金风科技股份有限公司 | Reactive power control method and device for wind power plant and controller for wind power plant |
| CN114696372A (en) * | 2022-03-14 | 2022-07-01 | 国网湖北省电力有限公司电力科学研究院 | Wind power plant optimization method considering reactive resource allocation priority |
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