CN102684174B - 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
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- CN102684174B CN102684174B CN201210164061.2A CN201210164061A CN102684174B CN 102684174 B CN102684174 B CN 102684174B CN 201210164061 A CN201210164061 A CN 201210164061A CN 102684174 B CN102684174 B CN 102684174B
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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, particularly the relay protective plan during wind energy turbine set low voltage crossing.
Background technology
Wind power generation takes full advantage of recyclability and the spatter property of wind energy, has good environment friendly, has become important electric power energy form.Along with 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 in the situation that grid side fault causes system voltage to decline, blower fan is off-grid support the stable operation of electrical network not, and increasing country explicitly calls for grid connected wind power unit must possess low voltage crossing (LVRT) ability
[1-3].Therefore, analyzing on the basis of above-mentioned requirements, carry out the research of protection scheme, be conducive to improve the low voltage ride-through capability of wind energy turbine set and the stability of grid-connected system operation, there is important theory significance and economic worth.At present, the research of low voltage ride-through capability of wind turbine generator system is mainly concentrated on and changes control strategy and increase hardware circuit aspect.Document [4,5] has been analyzed and has been adopted reactive power compensator to realize the method for the low voltage ride-through function of wind energy turbine set.When document [6,7] has proposed by change electric network fault, the control strategy of stator current is realized the scheme of low voltage crossing.Document [8-10] has been discussed the method that adopts rotor crowbar circuit Crowbar to realize blower fan low voltage crossing.From analyzing above; wind energy turbine set low-voltage ride-through method focuses mostly in wind-powered electricity generation unit itself at present; be necessary to invent new protection scheme; during wind energy turbine set low-voltage, carry out effective action; thereby help wind-powered electricity generation unit to pass through better this low-voltage period, 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 reforming scheme [J]. China Power, 2011,44 (6): 48-51.
[5] Wei Hongfen, Qiu Xiaoyan, Xu builds, etc. by SVC and TCSC, combine and improve asynchronous machine wind energy turbine set Enhancement of Transient Voltage Stability research [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] that off-grid does not move 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] that off-grid does not move during 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. the AC excitation wind power system operating analysis [J] that protection is controlled based on crowbar. Automation of Electric Systems, 2007,31 (23): 79-83.
[10] Zhang Xueguang, Xu Dianguo. under electrical network symmetric fault, based on active crowbar double-fed generator, control [J]. Electric Machines and Control, 2009,13 (1): 99-103.
Summary of the invention
The object of the invention is to propose a kind of new method that promotes wind energy turbine set low voltage ride-through capability.The method is from relaying protection angle, and during the wind energy turbine set low-voltage causing in grid side fault, minute time stage excision wind-powered electricity generation place on-load, reaches and make full use of unit capacity, promotes the object of wind energy turbine set low voltage ride-through capability.Technical scheme of the present invention is as follows:
A relay protecting method that promotes 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, install respectively inverse time lag undervoltage protection;
2) by the voltage transformer collection on wind energy turbine set high voltage bus the voltage data of site, and calculate the amplitude of three-phase voltage, and then voltage during calculating sampling falls numerical value;
3) proportion that the capacity that causes loading on the amplitude of falling of voltage and current collection circuit according to fault accounts for wind energy turbine set total capacity arranges 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 first moves.
As preferred implementation, the formula that arranges of the operate time in step 3) is: t=K
zs(1.9643 Δ u+2.1964), in formula, K
zs=2.5S
dGi/ S
∑for adaptation coefficient; S
dGibe on i bar current collection circuit with the capacity of wind-powered electricity generation unit; S
∑total capacity for wind energy turbine set; Δ u is that voltage falls numerical value.
Beneficial effect of the present invention is as follows:
1. in wind energy turbine set, the inverse time lag under-voltage protection characteristic on each current collection circuit, all lower than standard anti-time limit characteristic, can reduce the input number of times of Crowbar;
2. between grid side age at failure, the local load of the major part of wind energy turbine set still keeps being connected with electrical network, there will not be the grid-connected phenomenon of loading again on a large scale after failure removal;
3. inverse time lag under-voltage protection in this paper has adaptivity, only need set characteristic, without adjusting.
Accompanying drawing explanation
Fig. 1 wind-electricity integration system schematic.
The requirement of Fig. 2 wind energy turbine set low voltage crossing.
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
Below in conjunction with drawings and Examples, the present invention will be described.
In the wind-electricity integration system shown in Fig. 1, when breaking down, grid side will cause wind energy turbine set bus M voltage drop, and make the wind-powered electricity generation unit of wind energy turbine set enter the low voltage crossing period.If bus M place voltage does not meet the State Grid Corporation of China's wind energy turbine set low voltage crossing shown in Fig. 2 while requiring, wind-powered electricity generation unit, by cut, causes adverse effect to the stable operation of system.
The present invention is the requirement to grid connected wind power field low voltage ride-through capability according to the State Grid Corporation of China shown in Fig. 2, derives the standard anti-time limit characteristic relation that wind-powered electricity generation set grid-connection time and grid-connected point voltage fall percentage; Protective feature is set on this basis, thereby reaches the object that promotes wind energy turbine set low voltage ride-through capability.
Choose the line segment that in Fig. 2, grid-connected point voltage per unit value is 0.2 ~ 0.9 interval, establish its equation and be:
au+b=t (1)
In formula, u is grid-connected point voltage per unit value, and t is that the wind-powered electricity generation unit that regulation requires is incorporated into the power networks the time, a, and b is constant.By point (0.2,0.625), (0.9,2) substitution formula (1), obtains a=1.9643, b=0.2321,
t=1.9643u+0.2321 (2)
Getting Δ u=1-u is that voltage falls percentage, substitution formula (2),
t=-1.9643Δu+2.1964 (3)
Above formula has been expressed the wind-powered electricity generation set grid-connection time and grid-connected point voltage falls the relation between percentage, is the required standard inverse time lag characteristic of low voltage possessing of wind-powered electricity generation unit, as shown in curve in Fig. 31.
In order to make full use of the capacity of wind energy turbine set, the present invention installs respectively inverse time lag under-voltage protection on the local load of each current collection circuit of wind farm grid-connected system shown in Fig. 1, and the anti-time limit characteristic of each protection is pressed the setting that establishes an equation.
t=K
zs(-1.9643Δu+2.1964) (4)
In formula, K
zs=2.5S
dGi/ S
∑for adaptation coefficient; S
dGibe on i bar current collection circuit with the capacity of wind-powered electricity generation unit; S
∑total capacity for wind energy turbine set.
The anti-time limit characteristic of formula (4) has adaptivity, has decline in various degree, thereby reach the effect that local load support busbar voltage is excised in classification timesharing according to unit capacity on the basis of standard anti-time limit characteristic.For fear of too early action, inverse time lag under-voltage protection falls at system voltage the backup protection operation time limit t that degree need be avoided the reaction short circuit of installing on current collection circuit when lower
iII.Therefore, the lower limit of formula (4) operating characteristics be one identical with standard anti-time limit characteristic slope and guarantee that it is that 0.3(is that voltage is down to 0.7 that voltage falls percentage) time at t
iIIthe straight line of top, as shown in curve in Fig. 32.
Every current collection capacity of trunk and wind energy turbine set capacity ratio conventionally in 0.3 ~ 0.4 scope, adaptation coefficient K
zsin unit capacity, than on be multiplied by 2.5, K
zsin 0.75 ~ 1 scope, can meet the requirement of avoiding reserve short-circuit protection.Self adaptation anti-time limit characteristic can not decline 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 in Fig. 4.
If S
dG1, S
dG2, S
dG3increase successively, three inverse time lag under-voltage protection characteristics that correspondence draws as shown in Figure 3.When grid side fault causes bus M lower voltage to u
1time, the low-voltage inverse time protection being arranged on each current collection circuit will calculate respectively corresponding operate time, and by being arranged on protection on current collection circuit 1 with shorter time delay t
1first action, disconnects this locality load 1 and electrical network; If busbar voltage is promoted to u after excision circuit
2still can trigger next stage under-voltage protection, the protection on current collection circuit 2 will be with t
2deferred action, make busbar voltage rise to u
3, the rest may be inferred.
Claims (1)
1. a relay protecting method that promotes 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, install respectively inverse time lag undervoltage protection;
2) by the voltage transformer collection on wind energy turbine set high voltage bus the voltage data of site, and calculate the amplitude of three-phase voltage, and then voltage during calculating sampling falls numerical value;
3) proportion that the capacity that causes loading on the amplitude of falling of voltage and current collection circuit according to fault accounts for wind energy turbine set total capacity arranges the operate time of each protective device; divide time stage action tripping circuit breaker; protective device on the load branch circuit of the current collection circuit that capacity is less first moves, and the formula that arranges of operate time is wherein: t=K
zs(1.9643 Δ u+2.1964), in formula, K
zs=2.5S
dGi/ S
Σfor adaptation coefficient; S
dGibe on i bar current collection circuit with the capacity of wind-powered electricity generation unit; S
Σtotal capacity for wind energy turbine set; Δ u is that voltage falls numerical value.
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| 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 |
| EP3034561B1 (en) * | 2014-12-19 | 2019-02-06 | NKT HV Cables GmbH | A method of manufacturing a high-voltage DC cable joint, and a high-voltage DC cable joint. |
| 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 |
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| 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 |
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| 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 |
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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 |