CN102684174A - Relaying protection method for promoting low-voltage ride-through capacity of wind electric field - Google Patents
Relaying protection method for promoting low-voltage ride-through capacity of wind electric field Download PDFInfo
- Publication number
- CN102684174A CN102684174A CN2012101640612A CN201210164061A CN102684174A CN 102684174 A CN102684174 A CN 102684174A CN 2012101640612 A CN2012101640612 A CN 2012101640612A CN 201210164061 A CN201210164061 A CN 201210164061A CN 102684174 A CN102684174 A CN 102684174A
- Authority
- CN
- China
- Prior art keywords
- voltage
- capacity
- electric field
- wind electric
- wind energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Control Of Eletrric Generators (AREA)
Abstract
The invention belongs to the field of relaying protection of a power system and relates to a relaying protection method for promoting low-voltage ride-through capacity of a wind electric field. The method comprises the following steps of: respectively installing an inverse-time limit low-voltage protection device on a local load branch of each collector line of the wind electric field; collecting voltage data of a grid connection point through a voltage transformer on a high-voltage bus of the wind electric field, and calculating amplitude of three-phase voltage so as to calculate a voltage drop numerical value while sampling; and setting the action time of each protection device according to the drop amplitude of voltage caused by a fault and the proportion of capacity of the load on a collector line in the total capacity of the wind electric field, and carrying out time-sharing rating action to trip off a breaker, so the protection device on the load branch of the collector line with smaller capacity firstly acts. According to the relaying protection method for promoting the low-voltage ride-through capacity of the wind electric field, disclosed by the invention, during the low voltage period of the wind electric field, caused by a grid side fault, the load of the wind electric field can be subjected to time-sharing rating removal, and the capacity of a set can be fully utilized to improve the low-voltage ride-through capacity of the wind electric field.
Description
Technical field
The present invention relates to the relaying protection field of electric power system, the relay protective plan during particularly the wind energy turbine set low-voltage is passed through.
Background technology
Wind power generation has made full use of the recyclability and the spatter property of wind energy, has good environment friendly, has become important electric power energy form.Along with the scale and the capacity of wind-electricity integration constantly increases, electrical network improves constantly the service requirement of grid connected wind power field.For guaranteeing under the grid side fault causes situation that system voltage descends, blower fan is off-grid and support the stable operation of electrical network not, and more and more countries explicitly calls for the grid connected wind power unit must possess low-voltage and passes through (LVRT) ability
[1-3]Therefore, on the basis of analyzing above-mentioned requirements, carry out the research of protection scheme, help improving the low voltage ride-through capability of wind energy turbine set and the stability of grid-connected system operation, have important significance for theories and economic worth.At present, the research to low voltage ride-through capability of wind turbine generator system mainly concentrates on the change control strategy and increases the hardware circuit aspect.Document [4,5] has been analyzed the method that the low-voltage that adopts reactive power compensator realization wind energy turbine set is passed through function.The control strategy of stator current was realized the scheme that low-voltage is passed through when document [6,7] had proposed through the change electric network fault.Document [8-10] has been discussed and has been adopted rotor crowbar circuit Crowbar to realize the method that the blower fan low-voltage is passed through.Can know by above analysis; Wind energy turbine set low-voltage traversing method focuses mostly in wind-powered electricity generation unit itself at present; Be necessary to invent new protection scheme; During the wind energy turbine set low-voltage, carry out effective action, thereby help the wind-powered electricity generation unit to pass through this low-voltage period better, to guarantee the stable operation of wind-electricity integration system.
List of references
[1]Morren?J，Sjoerd?W?H.?Ride?through?of?wind?turbines?with?doubly-fed?induction?generator?during?a?voltage?dip[J].IEEE?Transactions?on?Energy?Conversion，2005，20(1)：435-441.
[2]Abbey?C，Joos?G.Effect?of?low?voltage?ride?through(LVRT)characteristic?on?voltage?stability[J].IEEE?Transacitons?on?Industry?Applications，2005，41(3)：1-7．
[3]Lopez?D，Sanchis?J，Roboam?P，et?al.?Dynamic?behavior?of?the?doubly?fed?induction?generator?during?three-phase?voltage?dips.IEEE?Trans?on?Energy?Conversion，2007，22(3)：709-717.
[4] Li Mingdong. wind energy turbine set realizes low-voltage crossing technology modification scheme [J]. China Power, 2011,44 (6): 48-51.
[5] Wei Hongfen, Qiu Xiaoyan, Xu builds, etc. unite through SVC and TCSC and to improve asynchronous machine wind energy turbine set transient voltage stability study [J]. regenerative resource, 2011,29 (4): 20-27.
[6] Yao Jun, Liao Yong, Tang Jianping. the AC excitation wind-driven generator excitation control strategy [J] of off-grid operation not during short circuit malfunction. Proceedings of the CSEE, 2007,27 (30): 64-71.
[7] to David, Yang Shunchang, Ran Li. the double fed induction generators excitation control strategy [J] of off-grid operation not during the electrical network symmetric fault. Proceedings of the CSEE, 2006 (3): 164-170.
[8] Li Jianlin, Xu Honghua, etc. wind generator system subnormal voltage operation technology [M]. Beijing: China Machine Press, 2008.
[9] Yao Jun, Liao Yong. based on the AC excitation wind power system operating analysis [J] of crowbar protection control. Automation of Electric Systems, 2007,31 (23): 79-83.
[10] Zhang Xueguang, Xu Dianguo. control [J] based on active crowbar double-fed generator under the electrical network symmetric fault. Electric Machines and Control, 2009,13 (1): 99-103.
Summary of the invention
The objective of the invention is to propose a kind of new method that promotes the wind energy turbine set low voltage ride-through capability.This method during the wind energy turbine set low-voltage that the grid side fault causes, is divided time stage excision wind-powered electricity generation place on-load from the relaying protection angle, reaches to make full use of unit capacity, promotes the purpose of wind energy turbine set low voltage ride-through capability.Technical scheme of the present invention is following:
A kind of relay protecting method that promotes the wind energy turbine set low voltage ride-through capability comprises the following steps:
1) on the local load branch circuit of each current collection circuit of wind energy turbine set, installs the inverse time lag undervoltage protection respectively;
2), and calculate the amplitude of three-phase voltage through the voltage transformer collection on the wind energy turbine set high voltage bus and the voltage data of site, and then the electric voltage dropping numerical value during calculating sampling;
3) proportion that the capacity that causes loading on the amplitude of falling and the current collection circuit of voltage according to fault accounts for the wind energy turbine set total capacity is provided with the operate time of each protective device; Divide time stage action tripping circuit breaker, the protective device on the load branch circuit of the current collection circuit that capacity is less is action earlier.
As preferred implementation, the formula that is provided with of the operate time in the step 3) is: t=K
Zs(1.9643 Δ u+2.1964), in the formula, K
Zs=2.5S
DGi/ S
∑Be adaptation coefficient; S
DGiBy on the i bar current collection circuit the capacity of band wind-powered electricity generation unit; S
∑Total capacity for wind energy turbine set; Δ u is an electric voltage dropping numerical value.
Beneficial effect of the present invention is following:
1. the inverse time lag under-voltage protection characteristic on each current collection circuit all is lower than the standard anti-time limit characteristic in the wind energy turbine set, can reduce the input number of times of Crowbar;
2. between the grid side age at failure, the most of local load of wind energy turbine set still keeps being connected with electrical network, the phenomenon that the extensive load in excision back that can not break down is incorporated into the power networks again;
3. the inverse time lag under-voltage protection of this paper proposition has adaptivity, only need set characteristic, need not to adjust.
Description of drawings
Fig. 1 wind-electricity integration system schematic.
Fig. 2 wind energy turbine set low-voltage is passed through requirement.
The inverse time protection characteristic that Fig. 3 current collection circuit is installed.
The operating characteristics of Fig. 4 low-voltage inverse time protection.
Embodiment
The present invention will be described below in conjunction with accompanying drawing and embodiment.
In wind-electricity integration system shown in Figure 1,, make the wind-powered electricity generation unit entering low-voltage of wind energy turbine set pass through the period when grid side breaks down causing wind energy turbine set bus M voltage to descend.If bus M place voltage does not satisfy State Grid Corporation of China's wind energy turbine set low-voltage shown in Figure 2 and passes through when requiring, the wind-powered electricity generation unit will be excised, and the stable operation of system is caused adverse effect.
The present invention is according to State Grid Corporation of China shown in Figure 2 requirement to grid connected wind power field low voltage ride-through capability, derives the standard anti-time limit characteristic relation that wind-powered electricity generation set grid-connection time and the point voltage that is incorporated into the power networks fall percentage; Protective feature is set on this basis, thereby reaches the purpose that promotes the wind energy turbine set low voltage ride-through capability.
Choosing the point voltage per unit value that is incorporated into the power networks among Fig. 2 is the line segment in 0.2 ~ 0.9 interval, establishes its equation and is:
au+b=t (1)
In the formula, u is the point voltage per unit value that is incorporated into the power networks, and the wind-powered electricity generation set grid-connection running time that t requires for regulation, a, b are constant.With point (0.2,0.625), (0.9,2) substitution formula (1) gets a=1.9643, b=0.2321, then
t=1.9643u+0.2321 (2)
Getting Δ u=1-u is electric voltage dropping percentage, substitution formula (2),
t=-1.9643Δu+2.1964 (3)
Following formula has been expressed the wind-powered electricity generation set grid-connection time and the point voltage that is incorporated into the power networks falls the relation between the percentage, is the required standard inverse time lag characteristic of low voltage that possesses of wind-powered electricity generation unit, shown in curve among Fig. 31.
In order to make full use of the capacity of wind energy turbine set, the present invention installs the inverse time lag under-voltage protection respectively on the local load of each current collection circuit of wind farm grid-connected system shown in Figure 1, and the anti-time limit characteristic of each protection is by the equation setting.
t=K
zs(-1.9643Δu+2.1964) (4)
In the formula, K
Zs=2.5S
DGi/ S
∑Be adaptation coefficient; S
DGiBy on the i bar current collection circuit the capacity of band wind-powered electricity generation unit; S
∑Total capacity for wind energy turbine set.
The anti-time limit characteristic of formula (4) has adaptivity, according to unit capacity decline is in various degree arranged on the basis of standard anti-time limit characteristic, thereby reaches the effect that local load support busbar voltage is excised in the classification timesharing.For fear of too early action, the inverse time lag under-voltage protection is fallen the backup protection operation time limit t that need avoid the reaction short circuit of being installed on the current collection circuit when degree is hanged down at system voltage
IIITherefore, the lower limit of formula (4) operating characteristics be one identical with standard anti-time limit characteristic slope and when guaranteeing that electric voltage dropping percentage is 0.3 (being that voltage reduces to 0.7) at t
IIIThe straight line of top is shown in curve among Fig. 32.
Every current collection capacity of trunk and wind energy turbine set capacity ratio usually in 0.3 ~ 0.4 scope, adaptation coefficient K
ZsThan on multiply by 2.5 in unit capacity, then K
ZsIn 0.75 ~ 1 scope, can satisfy the requirement of avoiding the short circuit backup protection.The self adaptation anti-time limit characteristic can not descend too seriously like this, makes full use of the ability that unit bears short circuit current, avoids unnecessary action.For example work as S
DGi/ S
∑=0.3 o'clock, the protective feature of this current collection circuit was:
t=-1.4732Δu+1.6473 (5)
This characteristic is the curve 2 among Fig. 4.
If S
DG1, S
DG2, S
DG3Increase successively, three inverse time lag under-voltage protection characteristics that correspondence is drawn are as shown in Figure 3.When causing bus M voltage drop, the grid side fault is low to moderate u
1The time, be installed in low-voltage inverse time protection on each current collection circuit with calculating the corresponding action time respectively, and by being installed in protection on the current collection circuit 1 with short time-delay t
1This locality load 1 and electrical network are broken off at first action; If busbar voltage is promoted to u behind the excision circuit
2Still can trigger the next stage under-voltage protection, the protection on the current collection circuit 2 will be with t
2Deferred action, make busbar voltage rise to u
3, the rest may be inferred.
Claims (2)
1. a relay protecting method that promotes the wind energy turbine set low voltage ride-through capability comprises the following steps:
1) on the local load branch circuit of each current collection circuit of wind energy turbine set, installs the inverse time lag undervoltage protection respectively;
2), and calculate the amplitude of three-phase voltage through the voltage transformer collection on the wind energy turbine set high voltage bus and the voltage data of site, and then the electric voltage dropping numerical value during calculating sampling;
3) proportion that the capacity that causes loading on the amplitude of falling and the current collection circuit of voltage according to fault accounts for the wind energy turbine set total capacity is provided with the operate time of each protective device; Divide time stage action tripping circuit breaker, the protective device on the load branch circuit of the current collection circuit that capacity is less is action earlier.
2. the relay protecting method of lifting wind energy turbine set low voltage ride-through capability according to claim 1 is characterized in that, the formula that is provided with of the operate time in the step 3) is: t=K
Zs(1.9643 Δ u+2.1964), in the formula, K
Zs=2.5S
DGi/ S
∑Be adaptation coefficient; S
DGiBy on the i bar current collection circuit the capacity of band wind-powered electricity generation unit; S
∑Total capacity for wind energy turbine set; Δ u is an electric voltage dropping numerical value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210164061.2A CN102684174B (en) | 2012-05-23 | 2012-05-23 | Relaying protection method for promoting low-voltage ride-through capacity of wind electric field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210164061.2A CN102684174B (en) | 2012-05-23 | 2012-05-23 | Relaying protection method for promoting low-voltage ride-through capacity of wind electric field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102684174A true CN102684174A (en) | 2012-09-19 |
| CN102684174B CN102684174B (en) | 2014-11-26 |
Family
ID=46815716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210164061.2A Active CN102684174B (en) | 2012-05-23 | 2012-05-23 | Relaying protection method for promoting low-voltage ride-through capacity of wind electric field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102684174B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201706A (en) * | 2014-09-04 | 2014-12-10 | 北京艾科迈新能源科技有限公司 | Energy storage cooperative control method giving consideration to fault ride-through as well as grid-connected and off-grid seamless switching |
| CN107278347A (en) * | 2014-12-19 | 2017-10-20 | Nkt Hv 电缆有限责任公司 | Manufacture the method and high pressure DC cable connectors of high pressure DC cable connectors |
| CN116316488A (en) * | 2023-02-10 | 2023-06-23 | 国网浙江省电力有限公司嘉兴供电公司 | Protection configuration and parameter setting method for wind farm fan collecting system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201821115U (en) * | 2010-08-10 | 2011-05-04 | 龙源电力集团股份有限公司 | Wind power plant integral low-voltage ride-through (LVRT) system |
| CN201887484U (en) * | 2010-12-29 | 2011-06-29 | 张伟 | Reactive compensation complete equipment for promoting low-voltage ride-through capacity of wind-power unit |
| CN102222930A (en) * | 2010-04-19 | 2011-10-19 | 严本信 | Intelligent and high efficient wind power farm |
| CN202190083U (en) * | 2011-08-03 | 2012-04-11 | 北京光耀麦斯韦风电技术有限公司 | Centralized wind farm low-voltage crossing system apparatus |
-
2012
- 2012-05-23 CN CN201210164061.2A patent/CN102684174B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222930A (en) * | 2010-04-19 | 2011-10-19 | 严本信 | Intelligent and high efficient wind power farm |
| CN201821115U (en) * | 2010-08-10 | 2011-05-04 | 龙源电力集团股份有限公司 | Wind power plant integral low-voltage ride-through (LVRT) system |
| CN201887484U (en) * | 2010-12-29 | 2011-06-29 | 张伟 | Reactive compensation complete equipment for promoting low-voltage ride-through capacity of wind-power unit |
| CN202190083U (en) * | 2011-08-03 | 2012-04-11 | 北京光耀麦斯韦风电技术有限公司 | Centralized wind farm low-voltage crossing system apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 刘会勇: "探讨含有风电场线路的海岛电网继电保护配置", 《广东科技》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201706A (en) * | 2014-09-04 | 2014-12-10 | 北京艾科迈新能源科技有限公司 | Energy storage cooperative control method giving consideration to fault ride-through as well as grid-connected and off-grid seamless switching |
| CN107278347A (en) * | 2014-12-19 | 2017-10-20 | Nkt Hv 电缆有限责任公司 | Manufacture the method and high pressure DC cable connectors of high pressure DC cable connectors |
| US10250021B2 (en) | 2014-12-19 | 2019-04-02 | Nkt Hv Cables Gmbh | Method of manufacturing a high-voltage DC cable joint, and a high-voltage DC cable joint |
| CN116316488A (en) * | 2023-02-10 | 2023-06-23 | 国网浙江省电力有限公司嘉兴供电公司 | Protection configuration and parameter setting method for wind farm fan collecting system |
| CN116316488B (en) * | 2023-02-10 | 2023-11-14 | 国网浙江省电力有限公司嘉兴供电公司 | Protection configuration and parameter setting method for wind farm fan collecting system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102684174B (en) | 2014-11-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Blaabjerg et al. | Distributed power-generation systems and protection | |
| Tsili et al. | A review of grid code technical requirements for wind farms | |
| Eissa | Protection techniques with renewable resources and smart grids—A survey | |
| Akhmatov et al. | Large penetration of wind and dispersed generation into Danish power grid | |
| CN105186559B (en) | A kind of double-fed wind power generator group low voltage crossing circuit and its control method | |
| Gashi et al. | Simulation the wind grid code requirements for wind farms connection in Kosovo transmission grid | |
| CN102694386B (en) | Electrified railway negative sequence unbalance compensation method | |
| Camm et al. | Reactive power compensation for wind power plants | |
| CN202172281U (en) | Grid-connected wind generating set | |
| CN102684174B (en) | Relaying protection method for promoting low-voltage ride-through capacity of wind electric field | |
| CN101902052B (en) | Wind power station whole low voltage ride through (LVRT) system | |
| CN201821115U (en) | Wind power plant integral low-voltage ride-through (LVRT) system | |
| CN204992581U (en) | Apply to electric main wiring of two electric pressure intermediate pressure sections of wind -powered electricity generation field | |
| Enrique | Generation capability curves for wind farms | |
| Turiman et al. | Analysis of high penetration level of distributed generation at medium voltage levels of distribution networks | |
| Yong et al. | Review of FRT requirements for integration of wind energy in China and Europe | |
| CN104362643A (en) | Method for calculating reactive compensation configured capacity for wind farm | |
| CN109256798A (en) | DFIG system passes through operation method under a kind of voltage symmetry failure | |
| Camm et al. | Reactive compensation systems for large wind farms | |
| Wu et al. | Impact of new-type synchronous condenser on voltage stability of jarud sending-end system | |
| CN2824410Y (en) | DC power dynamic compensator for AC-DC-AC multi-driving system | |
| Alayande et al. | Power quality considerations for distributed generation integration in the nigerian distribution network using neplan software | |
| Zhang et al. | Configuration, cooperation and existing problems of wind farm relay protection | |
| CN103501002B (en) | Fault emergency control method for new energy power station | |
| CN209134052U (en) | A kind of wind power generation set grid-connection power generation passive type self-protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210112 Address after: 224053 Yongxing new energy equipment Industrial Park, Sanli village, Xinxing Town, Tinghu District, Yancheng City, Jiangsu Province (10) Patentee after: JIANGSU YIDUOLI NEW ENERGY TECHNOLOGY Co.,Ltd. Address before: 300072 Tianjin City, Nankai District Wei Jin Road No. 92 Patentee before: Tianjin University |