CN104300547B - The idle method of replacing of wind energy turbine set dynamic reactive compensation device and blower fan - Google Patents
The idle method of replacing of wind energy turbine set dynamic reactive compensation device and blower fan Download PDFInfo
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- CN104300547B CN104300547B CN201410579127.3A CN201410579127A CN104300547B CN 104300547 B CN104300547 B CN 104300547B CN 201410579127 A CN201410579127 A CN 201410579127A CN 104300547 B CN104300547 B CN 104300547B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000005611 electricity Effects 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims description 18
- 238000006073 displacement reaction Methods 0.000 abstract description 15
- 230000007704 transition Effects 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
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Classifications
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The present invention relates to the idle method of replacing of a kind of wind energy turbine set dynamic reactive compensation device and blower fan, belong to wind energy turbine set voltage power-less automatic adjustment technology field, the method comprises: can obtain total current without work value, idle upwards controlled variable, downwards controlled variable of all wind-powered electricity generations according to from blower fan supervisory system, confirm the modified values of idle upwards controlled variable, downwards controlled variable; Idle replacement amount is determined: check idle replacement amount according to the idle upwards controlled variable of wind-powered electricity generation, downwards controlled variable: determine idle replacement amount according to dynamic reactive compensation device Reactive-power control step-length: check idle displacement according to the idle upwards controlled variable of wind-powered electricity generation, downwards controlled variable: the idle set(ting)value finally determining dynamic reactive compensation device and single blower fan respectively according to dynamic reactive compensation device Reactive-power control step-length. The inventive method makes wind farm grid-connected point voltage and blower fan set end voltage maintain smooth transition in whole displacement process, it is to increase the safety and reliability that wind energy turbine set is run.
Description
Technical field
The invention belongs to wind energy turbine set voltage power-less automatic adjustment technology field, in particular to the idle method of replacing of wind energy turbine set dynamic reactive compensation device and blower fan.
Background technology
GB GB/T19963-2011 " wind energy turbine set access power system technology regulation " points out: " wind energy turbine set should configure reactive voltage control system, possesses wattless power and regulates and voltage control capability. According to power system scheduling institution instruction, wind energy turbine set regulates its wattless power sending (or absorption) automatically, it is achieved to the control of wind farm grid-connected point voltage, its adjustment speed and control accuracy should be able to meet the requirement that power system voltage regulates. "
According to this GB requirement, the reactive power source of wind energy turbine set comprises Wind turbines and wind energy turbine set reactive-load compensation device. Wind energy turbine set to be made full use of reactive capability and the regulating power thereof of Wind turbines; When the reactive capability of Wind turbines can not meet system voltage-regulation needs, the reactive-load compensation device installing suitable capacity additional should be concentrated in wind energy turbine set, install dynamic reactive compensation device (SVG) if desired additional.
This GB also specifies, total installation of generating capacity is at million kilowatt scale and above wind farm group, and when power system generation three phase short circuit fault causes Voltage Drop, each wind energy turbine set should have following dynamic reactive supporting capacity in low voltage crossing process. When wind farm grid-connected point voltage is in 20%��90% interval of rated voltage, wind energy turbine set should be able to support voltage resume by injecting reactive current; From the moment that grid-connected point voltage falls appearance, the time of response of dynamic reactive current control is not more than 75ms, and the time length should be no less than 550ms.
Blower fan Reactive-power control is the time of response of second level, and dynamic reactive compensation device Reactive-power control is the time of response of Millisecond, and when wind energy turbine set generation Voltage Drop, first dynamic reactive compensation device fast response time can regulate.Here the problem existed is: assuming that dynamic reactive compensation device still has idle regulating power when wind energy turbine set first time, Voltage Drop occurred, will increase fast and send idle until full to improve voltage; But, when Voltage Drop occurs wind energy turbine set second time, dynamic reactive compensation device is owing to completely sending out, and cannot send more idle again, also just can't resolve the problem of Voltage Drop, and then may cause the generation of blower fan low voltage off-grid accident.
Visible, after wind energy turbine set first time occurs Voltage Drop to cause dynamic reactive compensation device completely to be sent out, before second time generation Voltage Drop, if can utilize idle displacement that dynamic reactive compensation device is sent by the reactive power capability of blower fan out, ensure that dynamic reactive compensation device has certain Reactive-power control nargin, so that it may to avoid there occurs of foregoing problems.
Output that dynamic reactive compensation device is idle divides and sends or absorb two directions, general represent with positive number send idle, absorb idle with negative number representation, rated capacity such as a set of dynamic reactive compensation device is 20MVar (megavar), then the scope of its idle output is-20MVar to+20MVar, represents maximum respectively and absorbs idle 20MVar, maximum sends idle 20MVar. Dynamic reactive compensation device is idle, and output is 0MVar, represent it neither send idle, also do not absorb idle.
The variation relation of wattless power and voltage is: can improve when the wattless power that reactive apparatus increase sends voltage level of power grid, reduce send wattless power time can reduce voltage level of power grid; Otherwise, when can reduce the wattless power of voltage level of power grid, minimizing absorption when increasing the wattless power absorbed when reactive apparatus, voltage level of power grid can be improved.
It may be seen that the idle operation point of dynamic reactive compensation device the best is 0MVar, now maximum in the Reactive-power control nargin sent, absorb on idle two directions. Can increase once Voltage Drop dynamic reactive compensation device like this send idle to improve voltage, it is also possible to when overtension increase absorb idle to reduce voltage.
Certainly all qualified in order to ensure wind farm grid-connected point voltage and blower fan set end voltage, even if may also cannot accomplish by blower fan Reactive-power control by light under normal steady-state conditions, dynamic reactive compensation device at this moment can only be relied on to regulate certain reactive capability to support. But after electric network state changes, as long as blower fan is idle has possessed regulating power, with regard to must use to greatest extent at once, blower fan is idle replaces out by the reactive capability of dynamic reactive compensation device.
Summary of the invention
It is an object of the invention to the generation for solving blower fan low voltage off-grid accident, the idle method of replacing of a kind of wind energy turbine set dynamic reactive compensation device and blower fan is proposed, the inventive method makes wind farm grid-connected point voltage and blower fan set end voltage maintain smooth transition in whole displacement process, it is to increase the safety and reliability that wind energy turbine set is run.
The idle method of replacing of the wind energy turbine set dynamic reactive compensation device that the present invention proposes and blower fan, it is characterised in that, the method comprises the following steps
1) when regulating cycle arrives, total current without work value, idle upwards controlled variable, downwards controlled variable of all wind-powered electricity generations can be obtained from blower fan supervisory system, be designated as Q respectivelygen��Qgen_up��Qgen_down; Single blower fan Reactive-power control step-length (the maximum permissible value of each Reactive-power control of single blower fan) is designated as Qgen_i; Blower fan number is designated as N;
If Qgen_up> Qgen_i* N, then the idle upwards controlled variable of blower fan is modified to: Qgen_up=Qgen_i* N;
If Qgen_down< (-1) * Qgen_i* N, then the idle downward controlled variable of blower fan is modified to: Qgen_down=(-1) * Qgen_i* N;
2) current dynamic reactive compensation device be designated as Q without work valuesvc, the Reactive-power control step-length of dynamic reactive compensation device is designated as Qsvc_i; Idle replacement amount is designated as Qset;
Idle replacement amount is determined according to dynamic reactive compensation device Reactive-power control step-length:
If Qsvc> Qsvc_i, then Q is madeset=Qsvc_i;
If Qsvc< (-1) * Qsvc_i, then Q is madeset=(-1) * Qsvc_i;
If (-1) * is Qsvc_i��Qsvc��Qsvc_i, then Q is madeset=Qsvc;
3) according to the idle upwards controlled variable Q of wind-powered electricity generationgen_up, downward controlled variable Qgen_downCheck idle replacement amount Qset:
If Qset> Qgen_up, then Q is madeset=Qgen_up;
If Qset< Qgen_down, then Q is madeset=Qgen_down;
4) if Qsvc=0, then go to step 1), show that the idle nargin of dynamic reactive compensation device has reached maximum, it is not necessary to carry out idle displacement;
If Qset=0, then go to step 1), show that dynamic reactive compensation device or blower fan do not have idle replacing power, idle displacement cannot be carried out;
If QsvcAnd QsetNot being 0, expression can carry out idle displacement, determines that the idle set(ting)value of dynamic reactive compensation device and single blower fan is as follows respectively:
The idle set(ting)value Q of dynamic reactive compensation devicesvc_set=Qsvc-Qset;
The idle set(ting)value Q of every typhoon machinegen_set=(Qgen+Qset)/N��
Feature and the advantage of the inventive method be:
The present invention is on the basis that wind farm grid-connected point voltage and blower fan set end voltage are all qualified, the Reactive-power control ability current according to blower fan, target is turned to so that the Reactive-power control nargin of dynamic reactive compensation device is maximum, exerted oneself by control the idle of dynamic reactive compensation device, coordinate simultaneously and regulate that blower fan is idle exerts oneself, dynamic reactive compensation device is sent or absorb idle be replaced into blower fan send or absorb idle.
The inventive method is the Reactive-power control nargin of dynamic reactive compensation device by idle displacement regulating guarantee, the amplitude simultaneously every time regulated by arranging the Reactive-power control step-length restriction of dynamic reactive compensation device and blower fan, wind farm grid-connected point voltage and the blower fan set end voltage is made to maintain smooth transition in whole displacement process, it is to increase the safety and reliability that wind energy turbine set is run.
Embodiment
Below in conjunction with a specific embodiment, introduce the wind energy turbine set dynamic reactive compensation device of the present invention and the idle method of replacing of blower fan.
The idle method of replacing of the wind energy turbine set dynamic reactive compensation device that the present invention proposes and blower fan, it is characterised in that, the method comprises the following steps:
1) when regulating cycle (regulating cycle can configure according to practical situation within the scope of 10 to 60 seconds) arrives, total current without work value, idle upwards controlled variable, downwards controlled variable of all wind-powered electricity generations can be obtained from blower fan supervisory system, be designated as Q respectivelygen��Qgen_up��Qgen_down; Single blower fan Reactive-power control step-length (the maximum permissible value of each Reactive-power control of single blower fan) is designated as Qgen_i; Blower fan number is designated as N;
If Qgen_up> Qgen_i* N, then the idle upwards controlled variable of blower fan is modified to: Qgen_up=Qgen_i* N;
If Qgen_down< (-1) * Qgen_i* N, then the idle downward controlled variable of blower fan is modified to: Qgen_down=(-1) * Qgen_i* N;
2) dynamic reactive compensation device is currently designated as Q without work valuesvc, dynamic reactive compensation device Reactive-power control step-length (the maximum permissible value of each Reactive-power control of dynamic reactive compensation device) is designated as Qsvc_i; Idle replacement amount is designated as Qset;
Idle replacement amount is determined according to dynamic reactive compensation device Reactive-power control step-length:
If Qsvc> Qsvc_i, then Qset=Qsvc_i;
If Qsvc< (-1) * Qsvc_i, then Q is madeset=(-1) * Qsvc_i;
If (-1) * is Qsvc_i��Qsvc��Qsvc_i, then Q is madeset=Qsvc;
3) according to the idle upwards controlled variable Q of wind-powered electricity generationgen_up, downward controlled variable Qgen_downCheck idle replacement amount Qset:
If Qset> Qgen_up, then Q is madeset=Qgen_up;
If Qset< Qgen_down, then Q is madeset=Qgen_down;
4) if Qsvc=0, then go to step 1), show that the idle nargin of dynamic reactive compensation device has reached maximum, it is not necessary to carry out idle displacement;
If Qset=0, then go to step 1), show that dynamic reactive compensation device or blower fan do not have idle replacing power, idle displacement cannot be carried out;
If QsvcAnd QsetNot being 0, expression can carry out idle displacement, determines that the idle set(ting)value of dynamic reactive compensation device and single blower fan is as follows respectively:
The idle set(ting)value Q of dynamic reactive compensation devicesvc_set=Qsvc-Qset;
The idle set(ting)value Q of every typhoon machinegen_set=(Qgen+Qset)/N��
The wind electric field blower installed capacity of the experimental application of the method for the present embodiment is 49.5MW (33 1.5MW blower fans), dynamic reactive compensation device capacity is 10MVar, have employed the idle method of replacing of the wind energy turbine set dynamic reactive compensation device of the present invention's proposition and blower fan, regulating cycle is 30 seconds, and concrete regulate process comprises the following steps:
1-1) (during 18 days 14 September in 2014 39 points and 16 seconds, first regulating cycle) obtain total current without work value 0.5MVar, idle upwards controlled variable 4.45, downwards controlled variable-5.45 of all wind-powered electricity generations from blower fan supervisory system; Single blower fan Reactive-power control step-length is 0.05MVar, blower fan number 33;
Due to 4.45 > 0.05*33 (=1.65), blower fan is idle upwards controlled variable be modified to 1.65;
Due to-5.45 < (-1) * 0.05*33 (=-1.65), blower fan is idle, and downward controlled variable is modified to-1.65;
1-2) dynamic reactive compensation device is current without work value 2.3MVar, and dynamic reactive compensation device Reactive-power control step-length is 0.5MVar:
Due to 2.3 > 0.5, then idle replacement amount is 0.5MVar;
1-3) check idle replacement amount 0.5MVar, meet blower fan idle upwards controlled variable 1.65MVar, downwards controlled variable-1.65 simultaneously;
1-4) determine that the idle set(ting)value of dynamic reactive compensation device and single blower fan is as follows respectively:
The idle set(ting)value Q of dynamic reactive compensation devicesvc_set=2.3 0.5=1.8;
The idle set(ting)value Q of every typhoon machinegen_set=(0.5+0.5)/33=0.03;
2-1) (during 18 days 14 September in 2014 39 points and 46 seconds, the 2nd regulating cycle) obtain total current without work value 1.1MVar, idle upwards controlled variable 3.85, downwards controlled variable-6.05 of all wind-powered electricity generations from blower fan supervisory system;
Due to 3.85 > 0.05*33 (=1.65), blower fan is idle upwards controlled variable be modified to 1.65;
Due to-6.05 < (-1) * 0.05*33 (=-1.65), blower fan is idle, and downward controlled variable is modified to-1.65;
2-2) dynamic reactive compensation device is current without work value 1.8MVar, and dynamic reactive compensation device Reactive-power control step-length is 0.5MVar:
Due to 1.8 > 0.5, then idle replacement amount is 0.5MVar;
2-3) check idle replacement amount 0.5MVar, meet blower fan idle upwards controlled variable 1.65MVar, downwards controlled variable-1.65 simultaneously;
2-4) determine that the idle set(ting)value of dynamic reactive compensation device and single blower fan is as follows respectively:
The idle set(ting)value Q of dynamic reactive compensation devicesvc_set=1.8 0.5=1.3;
The idle set(ting)value Q of every typhoon machinegen_set=(1.1+0.5)/33=0.05;
3-1) (during 18 days 14 September in 2014 40 points and 16 seconds, the 3rd regulating cycle) obtain total current without work value 1.65MVar, idle upwards controlled variable 3.3, downwards controlled variable-6.6 of all wind-powered electricity generations from blower fan supervisory system;
Due to 3.3 > 0.05*33 (=1.65), blower fan is idle upwards controlled variable be modified to 1.65;
Due to-6.6 < (-1) * 0.05*33 (=-1.65), blower fan is idle, and downward controlled variable is modified to-1.65;
3-2) dynamic reactive compensation device is current without work value 1.3MVar, and dynamic reactive compensation device Reactive-power control step-length is 0.5MVar:
Due to 1.3 > 0.5, then idle replacement amount is 0.5MVar;
3-3) check idle replacement amount 0.5MVar, meet blower fan idle upwards controlled variable 1.65MVar, downwards controlled variable-1.65 simultaneously;
3-4) determine that the idle set(ting)value of dynamic reactive compensation device and single blower fan is as follows respectively:
The idle set(ting)value Q of dynamic reactive compensation devicesvc_set=1.3 0.5=0.8;
The idle set(ting)value Q of every typhoon machinegen_set=(1.65+0.5)/33=0.065;
4-1) (during 18 days 14 September in 2014 40 points and 46 seconds, the 4th regulating cycle) obtain total current without work value 2.1MVar, idle upwards controlled variable 2.85, downwards controlled variable-7.05 of all wind-powered electricity generations from blower fan supervisory system;
Due to 2.85 > 0.05*33 (=1.65), blower fan is idle upwards controlled variable be modified to 1.65;
Due to-7.05 < (-1) * 0.05*33 (=-1.65), blower fan is idle, and downward controlled variable is modified to-1.65;
4-2) dynamic reactive compensation device is current without work value 0.8MVar, and dynamic reactive compensation device Reactive-power control step-length is 0.5MVar:
Due to 0.8 > 0.5, then idle replacement amount is 0.5MVar;
4-3) check idle replacement amount 0.5MVar, meet blower fan idle upwards controlled variable 1.65MVar, downwards controlled variable-1.65 simultaneously;
4-4) determine that the idle set(ting)value of dynamic reactive compensation device and single blower fan is as follows respectively:
The idle set(ting)value Q of dynamic reactive compensation devicesvc_set=0.8 0.5=0.3;
The idle set(ting)value Q of every typhoon machinegen_set=(2.1+0.5)/33=0.079;
5-1) (during 18 days 14 September in 2014 41 points and 16 seconds, the 5th regulating cycle) obtain total current without work value 2.63MVar, idle upwards controlled variable 2.32, downwards controlled variable-7.58 of all wind-powered electricity generations from blower fan supervisory system;
Due to 2.32 > 0.05*33 (=1.65), blower fan is idle upwards controlled variable be modified to 1.65;
Due to-7.58 < (-1) * 0.05*33 (=-1.65), blower fan is idle, and downward controlled variable is modified to-1.65;
5-2) dynamic reactive compensation device is current without work value 0.3MVar, and dynamic reactive compensation device Reactive-power control step-length is 0.5MVar:
Due to-0.5 < 0.3 < 0.5, then idle replacement amount is 0.3MVar;
5-3) check idle replacement amount 0.5MVar, meet blower fan idle upwards controlled variable 1.65MVar, downwards controlled variable-1.65 simultaneously;
5-4) determine that the idle set(ting)value of dynamic reactive compensation device and single blower fan is as follows respectively:
The idle set(ting)value Q of dynamic reactive compensation devicesvc_set=0.3 0.3=0;
The idle set(ting)value Q of every typhoon machinegen_set=(2.63+0.3)/33=0.089;
6) (41 points 46 seconds during 18 days 14 September in 2014,6th regulating cycle) dynamic reactive compensation device is current without work value 0MVar, do not need to carry out idle displacement, wait that the 7th regulating cycle arrives, obtain total current without work value, idle upwards controlled variable, downwards controlled variable of all wind-powered electricity generations again, and carry out each step.
As can be seen from above-described embodiment, after have employed the idle method of replacing of the wind energy turbine set dynamic reactive compensation device of the present invention's proposition and blower fan, from perform idle displacement strategy to the idle output of dynamic reactive compensation device be 0 altogether spend time 2.5 minutes, each dynamic reactive compensation device Reactive-power control amount all��0.5MVar, the adjustment step-length that each blower fan Reactive-power control amount is about 0.01MVar, is less than 0.05MVar.Idle amount owing to regulating every time is all less, accounts for 5% and the 1% of dynamic reactive compensation device rated capacity and blower fan rated capacity respectively, and four take turns wind farm grid-connected point voltage and blower fan set end voltage during displacement regulates changes all less, and overall adjustment effect is better.
Claims (1)
1. the idle method of replacing of wind energy turbine set dynamic reactive compensation device and blower fan, it is characterised in that, the method comprises the following steps:
1) when regulating cycle arrives, obtain total current without work value, idle upwards controlled variable, idle downward controlled variable of all wind-powered electricity generations from blower fan supervisory system, it is designated as Q respectivelygen��Qgen_up��Qgen_down; Single blower fan Reactive-power control step-length is designated as Qgen_i; Blower fan number is designated as N;
If Qgen_up> Qgen_i* N, then the idle upwards controlled variable of blower fan is modified to: Qgen_up=Qgen_i* N;
If Qgen_down< (-1) * Qgen_i* N, then the idle downward controlled variable of blower fan is modified to: Qgen_down=(-1) * Qgen_i* N;
2) dynamic reactive compensation device is currently designated as Q without work valuesvc, dynamic reactive compensation device Reactive-power control step-length is designated as Qsvc_i; Idle replacement amount is designated as Qset;
Idle replacement amount is determined according to dynamic reactive compensation device Reactive-power control step-length:
If Qsvc> Qsvc_i, then Qset=Qsvc_i;
If Qsvc< (-1) * Qsvc_i, then Q is madeset=(-1) * Qsvc_i;
If (-1) * is Qsvc_i��Qsvc��Qsvc_i, then Q is madeset=Qsvc;
3) according to the idle upwards controlled variable Q of blower fangen_up, idle downward controlled variable Qgen_downCheck idle replacement amount Qset:
If Qset> Qgen_up, then Q is madeset=Qgen_up;
If Qset< Qgen_down, then Q is madeset=Qgen_down;
4) if Qsvc=0 or Qset=0, then go to step 1);
If QsvcAnd QsetIt is not all 0, determines that the idle set(ting)value of dynamic reactive compensation device and single blower fan is as follows respectively:
The idle set(ting)value Q of dynamic reactive compensation devicesvc_set=Qsvc-Qset;
The idle set(ting)value Q of every typhoon machinegen_set=(Qgen+Qset)/N��
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| CN105529719B (en) * | 2015-11-23 | 2017-11-28 | 国家电网公司 | The wind power plant dynamic reactive compensation device adjusting method that voltage power-less considers |
| CN106410814B (en) * | 2016-05-20 | 2019-02-12 | 中国大唐集团科学技术研究院有限公司华东分公司 | The method for adjusting power plant work busbar voltage by synchronous motor |
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| JP3607561B2 (en) * | 2000-03-22 | 2005-01-05 | 日本碍子株式会社 | Constant power factor control method for reactive power compensator |
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