CN105317632A - Measuring method for rotational inertia of wind turbine generator unit - Google Patents
Measuring method for rotational inertia of wind turbine generator unit Download PDFInfo
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- CN105317632A CN105317632A CN201510653205.4A CN201510653205A CN105317632A CN 105317632 A CN105317632 A CN 105317632A CN 201510653205 A CN201510653205 A CN 201510653205A CN 105317632 A CN105317632 A CN 105317632A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 20
- 238000010248 power generation Methods 0.000 claims description 4
- 238000011217 control strategy Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
-
- 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
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
The invention relates to a measuring method for rotational inertia of a wind turbine generator unit. The measuring method comprises the following steps that 1 the weather of which the wind speed is stable in the maximum wind energy capture area of the wind turbine generator unit is selected to conduct measurement; 2 an energy-balance equation is established; and 3 the rotational inertia of the wind turbine generator unit is worked out. According to the measuring method for the rotational inertia of the wind turbine generator unit, measurement is conducted in the maximum wind energy capture area of the wind turbine generator unit when the wind speed is stable; the wind turbine generator unit is controlled to operate in a maximum wind energy tracing mode, and first useful output power and a first rotor rotating speed are obtained; the operation mode of the wind turbine generator unit is changed, the useful output power of the wind turbine generator unit is changed into second useful output power, the rotor rotating speed is changed into a second rotor rotating speed, and first output electric energy is obtained, so that the energy-balance equation is established; the rotational inertia of the wind turbine generator unit is determined based on the energy-balance equation. The measuring method for the rotational inertia of the wind turbine generator unit has the advantage of being excellent.
Description
Technical field
The present invention relates to technical field of power systems, be specifically related to a kind of method of measurement of Wind turbines rotary inertia.
Background technique
Various faults in electric power system can make electric power system enter transient state process, the inertia time constant size of generator directly affects power system frequency change, and determine that can it keep stable operation after transient state process terminates, conventional electric power generation unit is directly connected with electric power system, its inertia time constant only depends on the mechanical structure of rotor, and the generator set that Wind turbines or tidal power machine etc. are connected with electric power system by power electronics changer, the control strategy of its inertia time constant showed electric power system and power electronics changer is closely related.
Power electronics converter Control strategy needs to determine Wind turbines rotor store kinetic energy, could provide support in maintenance power system stability.Wind turbines rotor store kinetic energy needs the rotary inertia of Wind turbines and rotating speed to calculate, therefore the measurement of Wind turbines rotary inertia is of practical significance to maintenance power system stability aspect.
The theory calculate numerical value that current Wind turbines rotary inertia only has producer to provide, there is no the method for Wind turbines rotary inertia being carried out to actual measurement.
In existing technological scheme, a kind of theoretic method is had to measure electric machine rotation inertia: its general technological scheme is: under motor is in torque control model, control its torque and be respectively the contrary torque of first, second two sizes equidirectional, measure motor speed change into the second rotating speed by the first rotating speed and change into the first rotating speed needed time by the second rotating speed, set up two torque balance equations, calculate electric machine rotation inertia.
The shortcoming of technique scheme is: 1. such scheme can only be applied to the measurement of the intrinsic rotary inertia of the motor of controlled torque, Wind turbines rotating part also comprises the parts such as blade, wheel hub, gear, adopts such scheme cannot measure the rotary inertia of this part mechanical structure.2. such scheme when running of wind generating set, can not be measured its rotary inertia.
Summary of the invention
Of the present invention
goal of the inventionjust be the method for measurement that a kind of Wind turbines rotary inertia is provided.
Realize foregoing invention object of the present invention
technological schemefor:
The method of measurement of a kind of Wind turbines rotary inertia of the present invention, its method step is as follows:
One, choose wind speed to stablize and the weather enforcement measurement being in wind turbine generator maximum wind energy capture region, measurement procedure is:
1st step: controlling running of wind generating set mode is maximal power point tracking pattern, after stable operation, measures now Wind turbines and to gain merit output power and rotor speed, be designated as the first meritorious output power respectively
and the first rotor rotating speed
;
2nd step: keep wind power generation unit blade inclined vane angle constant, changing running of wind generating set mode is constant meritorious output mode, controls Wind turbines output power of gaining merit and changes into the second meritorious output power
, continue for some time, until Wind turbines rotor speed changes into the second rotor speed
, note Wind turbines output power of gaining merit starts to change the moment and is
in the moment, Wind turbines output power of gaining merit changes into the second meritorious output power
moment be
in the moment, Wind turbines rotor speed changes into the second rotor speed
moment be
moment, remember from
moment extremely
moment Wind turbines exports meritorious energy summation for exporting electric energy
;
Two, energy-balance equation is set up
Because in whole measuring phase, the inclined vane angle of wind-force turbines vane is constant all the time, and wind speed is stablized, therefore the wind energy power that blade is caught can think certain value
, remove mechanical loss power
after, be the first meritorious output power
(
), can ignore when the first rotor rotating speed and the second rotor speed are more or less the same
change.From
moment extremely
in the measuring phase in moment, what blade was caught can be used for the wind energy total amount being converted to electric energy
as shown in the formula:
Namely
.
By
moment starts meritorious output of Wind turbines and changes, extremely
the meritorious energy summation that exports of moment Wind turbines is
; The increasing amount of Wind turbines rotor kinetic energy is
,
Set up energy-balance equation:
Rotor kinetic energy amounts can the change of rotor speed and rotary inertia represent:
Energy-balance equation is expressed as again:
；
Three, Wind turbines rotary inertia is solved
。
The present invention may be summarized to be: stable and be in wind turbine generator maximum wind energy capture region and implement to measure at wind speed, controls Wind turbines and runs in maximal power point tracking mode, obtain the first meritorious output power and the first rotor rotating speed; Change running of wind generating set mode, make its active power of output change into the second meritorious output power, rotor speed changes into the second rotor speed, obtains first and exports electric energy, thus set up energy-balance equation; Based on described energy-balance equation, determine the rotary inertia of described Wind turbines.
Of the present invention
beneficial effectfor:
Key point of the present invention is:
1, Wind turbines after stable operation, keeps the inclined vane angle of blade constant, can think that the wind energy power that blade is caught is steady state value under wind speed stable case under maximum power tracing pattern;
2, change running of wind generating set mode, reduce Wind turbines active power of output, Wind turbines mechanical part wind energy input power is greater than electromagnetism output power, and Wind turbines rotor speed increases;
3, set up energy-balance equation by wind energy input power, electromagnetism output power, measurement time, rotor speed knots modification, solve Wind turbines rotary inertia;
4, can measure when blower fan normally runs, not need to cut machine.
Advantage of the present invention is: 1, the present invention can measure the unitary rotation inertia comprising the Wind turbines rotating parts such as blade, wheel hub, gear, rotor; 2, the present invention can measure the Wind turbines run, and does not need to excise Wind turbines; 3, step of the present invention is simple and easy to realization and can utilizes on-line measurement data; 4, to be used to the data processing of inertia calculation simple in the present invention.
Accompanying drawing explanation
The graph of a relation that Fig. 1 is wind speed described in the embodiment of the present invention and the maximum meritorious output of Wind turbines;
The changed power figure that Fig. 2 is measuring phase described in the embodiment of the present invention.
Embodiment
The method of measurement of a kind of Wind turbines rotary inertia be connected with electrical network by power electronic equipment of the present invention:
One, weather conditions is measured: choose wind speed and stablize and the weather enforcement measurement being in wind turbine generator maximum wind energy capture region (namely in Fig. 1, AB section is shown);
The maximum meritorious output power of Wind turbines and wind speed relation be as shown in Figure 1: AB section is maximal wind-energy capture region, and BC section is permanent rotary speed area, and CD section is invariable power region.
Measurement procedure is:
The first step: controlling running of wind generating set mode is maximal power point tracking pattern, after stable operation, measures now Wind turbines and to gain merit output power and rotor speed, be designated as the first meritorious output power respectively
and the first rotor rotating speed
;
Second step: keep wind power generation unit blade inclined vane angle constant, changing running of wind generating set mode is constant meritorious output mode, controls Wind turbines output power of gaining merit and changes into the second meritorious output power
, continue for some time, until Wind turbines rotor speed changes into the second rotor speed
, note Wind turbines output power of gaining merit starts to change the moment and is
in the moment, Wind turbines output power of gaining merit changes into the second meritorious output power
moment be
in the moment, Wind turbines rotor speed changes into the second rotor speed
moment be
moment (as shown in Figure 2), remember from
moment extremely
moment Wind turbines exports meritorious energy summation for exporting electric energy
.
Two, energy-balance equation is set up
Because in whole measuring phase, the inclined vane angle of wind-force turbines vane is constant all the time, and wind speed is stablized, therefore the wind energy power that blade is caught can think certain value
, from
moment extremely
in the measuring phase in moment, the wind energy total amount that blade is caught
as shown in the formula:
By
moment starts meritorious output of Wind turbines and changes, extremely
the meritorious energy summation that exports of moment Wind turbines is
; The increasing amount of Wind turbines rotor kinetic energy is
,
Set up energy-balance equation:
Rotor kinetic energy amounts can the change of rotor speed and rotary inertia represent:
Energy-balance equation is expressed as again:
；
Three, Wind turbines rotary inertia is solved
Wind turbines rotary inertia can be tried to achieve by as above process.
Embodiment 2:
Measure the rotary inertia of a 2MW Wind turbines:
Implement to measure when wind speed is stable at 9m/s;
The first step: adopt maximal power tracing mode to control, now Wind turbines output power of gaining merit is 600kW(
), rotor speed is 1350r/min(
);
Second step:
time changing control mode is constant meritorious output, and controlling Wind turbines output power of gaining merit is 200kW(
), rotor speed reaches 1400r/min(
) time is designated as
moment (
moment extremely
time in moment is 279s), can be obtained by SCADA system
moment extremely
it is 5978461kJ(that moment Wind turbines exports meritorious energy summation
).
3rd step: solve energy-balance equation
Therefore this typhoon group of motors rotary inertia is:
Key point of the present invention is:
1, Wind turbines after stable operation, keeps the inclined vane angle of blade constant, can think that the wind energy power that blade is caught is steady state value under wind speed stable case under maximum power tracing pattern;
2, change running of wind generating set mode, reduce Wind turbines active power of output, Wind turbines mechanical part wind energy input power is greater than electromagnetism output power, and Wind turbines rotor speed increases;
3, set up energy-balance equation by wind energy input power, electromagnetism output power, measurement time, rotor speed knots modification, solve Wind turbines rotary inertia;
4, can measure when blower fan normally runs, not need to cut machine.
Claims (1)
1. a method of measurement for Wind turbines rotary inertia, is characterized in that: method step is as follows
One, choose wind speed to stablize and the weather enforcement measurement being in wind turbine generator maximum wind energy capture region, measurement procedure is:
1st step: controlling running of wind generating set mode is maximal power point tracking pattern, after stable operation, measures now Wind turbines and to gain merit output power and rotor speed, be designated as the first meritorious output power respectively
and the first rotor rotating speed
;
2nd step: keep wind power generation unit blade inclined vane angle constant, changing running of wind generating set mode is constant meritorious output mode, controls Wind turbines output power of gaining merit and changes into the second meritorious output power
, continue for some time, until Wind turbines rotor speed changes into the second rotor speed
, note Wind turbines output power of gaining merit starts to change the moment and is
in the moment, Wind turbines output power of gaining merit changes into the second meritorious output power
moment be
in the moment, Wind turbines rotor speed changes into the second rotor speed
moment be
moment, remember from
moment extremely
moment Wind turbines exports meritorious energy summation for exporting electric energy
;
Two, energy-balance equation is set up
Because in whole measuring phase, the inclined vane angle of wind-force turbines vane is constant all the time, and wind speed is stablized, therefore the wind energy power that blade is caught can think certain value
, remove mechanical loss power
after, be the first meritorious output power
(
), can ignore when the first rotor rotating speed and the second rotor speed are more or less the same
change;
From
moment extremely
in the measuring phase in moment, what blade was caught can be used for the wind energy total amount being converted to electric energy
as shown in the formula:
Namely
;
By
moment starts meritorious output of Wind turbines and changes, extremely
the meritorious energy summation that exports of moment Wind turbines is
; The increasing amount of Wind turbines rotor kinetic energy is
,
Set up energy-balance equation:
Rotor kinetic energy amounts can the change of rotor speed and rotary inertia represent:
Energy-balance equation is expressed as again:
；
Three, Wind turbines rotary inertia is solved
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510653205.4A CN105317632B (en) | 2015-10-12 | 2015-10-12 | Method for measuring rotational inertia of wind turbine generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510653205.4A CN105317632B (en) | 2015-10-12 | 2015-10-12 | Method for measuring rotational inertia of wind turbine generator |
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| Publication Number | Publication Date |
|---|---|
| CN105317632A true CN105317632A (en) | 2016-02-10 |
| CN105317632B CN105317632B (en) | 2020-04-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556863A (en) * | 2019-09-02 | 2019-12-10 | 国电南瑞南京控制系统有限公司 | inertia-free power supply access capacity estimation method constrained by system frequency stability |
| CN112600199A (en) * | 2020-12-07 | 2021-04-02 | 北京四方继保工程技术有限公司 | Wind turbine generator equivalent rotational inertia online evaluation method based on rotor kinetic energy |
Citations (5)
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|---|---|---|---|---|
| CN101266183A (en) * | 2008-05-09 | 2008-09-17 | 山东电力研究院 | Pump storage plant generator/ motor rotor rotational inertia test method |
| CN103441529A (en) * | 2013-08-22 | 2013-12-11 | 国家电网公司 | Variable-speed wind turbine generator inertia response simulating control method |
| CN103441722A (en) * | 2013-08-14 | 2013-12-11 | 国家电网公司 | Active control method of doubly-fed wind turbine generator set |
| CN104538989A (en) * | 2014-07-29 | 2015-04-22 | 清华大学 | Control method for closed-loop active power of wind power plant |
| KR101545839B1 (en) * | 2015-06-29 | 2015-08-20 | 전북대학교산학협력단 | Method for controlling a output in a wind turbine |
-
2015
- 2015-10-12 CN CN201510653205.4A patent/CN105317632B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101266183A (en) * | 2008-05-09 | 2008-09-17 | 山东电力研究院 | Pump storage plant generator/ motor rotor rotational inertia test method |
| CN103441722A (en) * | 2013-08-14 | 2013-12-11 | 国家电网公司 | Active control method of doubly-fed wind turbine generator set |
| CN103441529A (en) * | 2013-08-22 | 2013-12-11 | 国家电网公司 | Variable-speed wind turbine generator inertia response simulating control method |
| CN104538989A (en) * | 2014-07-29 | 2015-04-22 | 清华大学 | Control method for closed-loop active power of wind power plant |
| KR101545839B1 (en) * | 2015-06-29 | 2015-08-20 | 전북대학교산학협력단 | Method for controlling a output in a wind turbine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556863A (en) * | 2019-09-02 | 2019-12-10 | 国电南瑞南京控制系统有限公司 | inertia-free power supply access capacity estimation method constrained by system frequency stability |
| CN112600199A (en) * | 2020-12-07 | 2021-04-02 | 北京四方继保工程技术有限公司 | Wind turbine generator equivalent rotational inertia online evaluation method based on rotor kinetic energy |
| CN112600199B (en) * | 2020-12-07 | 2023-08-15 | 北京四方继保工程技术有限公司 | Online evaluation method for equivalent moment of inertia of wind turbine generator based on rotor kinetic energy |
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