信息通报2011.5.12
发布时间:2011-05-12 09:28:05 【 】 浏览:62

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新闻


酒泉风机集体脱网

 

l         224日,一次“一般性电网电压波动”, 造成酒泉风电基地84万千瓦、598台风电机组相继脱网,酒泉瓜州境内所有风电场均有机组脱网。脱网事故导致电压大幅波动,甚至波及甘肃电网,对整个西北电网造成威胁。

 

l         酒泉脱网至少反映出两方面的漏洞:首先是发生故障的风电机组不具备供货合同中标明的“低电压穿越”能力,其次是中电投酒泉桥西风场35千伏电缆施工工艺水平和质量管理存在明显的缺陷。

 

l         桥西风电设备招商早在2008年已经完成,虽然后续通过补充技术协议的形式规定了关于低电压穿越的要求,但当时国内根本没有关于低电压穿越的明确技术标准。

 

l         “现有各制造企业供货的产品几乎都不具有低电压穿越能力。” 对现有风电机组进行低电压穿越技术改造除了需要解决技术问题外,改造的成本也非常高昂。“以华锐的一台1.5兆瓦双馈机组为例,改造成本起码不低于30~40万元。”

http://news.hexun.com/2011-04-05/128490035.html

文献


低电压穿越(low voltage ride through LVRT

低电压穿越(LVRT),指在风力发电机并网点电压跌落的时候,风机能够保持并网,甚至向电网提供一定的无功功率,支持电网恢复,直到电网恢复正常,从而“穿越”这个低电压时间(区域)

双馈型风力发电机低电压穿越仿真分析

【作者】 姜传; 肖湘宁;

【机构】 华北电力大学;

【摘要】 针对双馈型风力发电机在低电压穿越过程中所遇到的定转子过流问题,采用主动撬棒电路旁路转子侧变流器解决,Matlab/Simulink中建立了模型并进行了仿真分析,仿真结果验证了主动撬棒电路能够有效实现双馈型风力发电机在三相对称故障条件下的低电压穿越,并分析了撬棒电阻的选取,得出选取较大的撬棒电阻更有利于电网的恢复的结论。

http://www.cnki.net/kcms/detail/detail.aspx?QueryID=2&CurRec=10&DbCode=CJFQ&dbname=CJFDLAST2010&filename=JLDJ201005004&uid=WEEvREdiSUtucElKVWswTWxrS0V3TTQrSi9ROHRrTUE3RXZzaVptQVFSbVFuUHRlbmUwVFNnNnVBaS9HeWc9PQ==

 

金风1.5MW风力发电机组低电压穿越测试

【作者】 黄远彦;

【机构】 北京金风科创风电设备有限公司电控事业部;

【摘要】 <>就风机低电压穿越概念、测试要求、测试系统原理和金风1.5MW风力发电机低电压穿越测试结果做一个概述。金风1.5MW直驱永磁风力发电机组低电压穿越测试于201085号在河北围场山弯子风电场测试完毕。测试结果完全满足国家电网公司企业标准。

http://www.cnki.net/kcms/detail/detail.aspx?dbCode=cjfq&dbName=cjfq2011&FileName=dqzh201102031&filetitle=&uid=WEEvREdiSUtucElKVWtodmR5MHM3eldQOXBhMkc5N01sckhqa1gwcmxUb1BvUGkrSzZQMWVnY0JNR1VXMHc9PQ==

 

A dynamic LVRT solution for Doubly-Fed Induction Generator

Abdel-Baqi, O. ; Nasiri, A. ;

Power Electron. & Electr. Motor Drives Lab., Univ. of Wisconsin-Milwaukee, Milwaukee, WI, USA

Doubly-fed induction generators (DFIG) have become the most common type of wind turbine generators. However, this type of generator is susceptible to grid side low voltage and short circuits, due to existence of a power electronics converter on the rotor side. When a short circuit or voltage sag happens on the grid side, the rotor current of the generator tends to rise, which could cause damage to the rotor converter. Design and implementation of a series converter on the stator side is presented in this paper to limit the current rise in the rotor. This system includes an active DC/AC inverter, three series transformers and a DC bus capacitor. To lower the rating of the components and make the system viable for practical solutions, an exponential decaying sinusoidal voltage instead of a pure sinusoidal voltage is applied by the converter during short circuit.

http://ieeexplore.ieee.org/search/srchabstract.jsp?tp=&arnumber=5415026&queryText%3Dlvrt%26openedRefinements%3D*%26searchField%3DSearch+All

 

Low Voltage Ride Through of Wind Farms With Cage Generators: STATCOM Versus SVC

Molinas, M. ; Jon Are Suul ; Undeland, T. ;

Dept. of Electr. Power Eng., Norwegian Univ. of Sci. & Technol., Trondheim

This paper analyzes the extent to which the low voltage ride through (LVRT) capability of wind farms using squirrel cage generators can be enhanced by the use of a STATCOM, compared to the thyristor controlled static var compensator (SVC). The transient stability margin is proposed as the indicator of LVRT capability. A simplified analytical approach based on torque-slip characteristics is first proposed to quantify the effect of the STATCOM and the SVC on the transient stability margin. Results from experiments with a STATCOM and a 7.5 kW induction machine emulating a wind turbine are used to validate the suggested analytical approach. Further verifications based on detailed time-domain simulations are also provided. Calculations, simulations and measurements confirm how the increased STATCOM rating can provide an increased transient stability margin and thus enhanced LVRT capability. Compared to the SVC, the STATCOM gives a larger contribution to the transient margin as indicated by both calculations and simulations. The inaccuracies introduced by neglecting the flux transients in the suggested approach are discussed and found reasonable for an estimation method when considering the simplicity compared to detailed time-domain simulation studies. A method for estimating the required rating of different compensation devices to ensure stability after a fault is suggested based on the same approach.

http://ieeexplore.ieee.org/search/srchabstract.jsp?tp=&arnumber=4495547&queryText%3Dlvrt%26openedRefinements%3D*%26searchField%3DSearch+All

 

Effect of low voltage ride through (LVRT) characteristic on voltage stability

Abbey, C. ; Joos, G. ;

CANMET Energy Technol. Centre, Varennes, Que., Canada

The number of wind installations has grown worldwide at unprecedented rates in recent years. As well, the average size of the installations has increased due to the advent of larger capacity machine, variable speed technology, and an increasing number of off-shore sites. This raises the concern that widespread tripping of wind generators following disturbances could lead to propagation of transient instabilities and could potentially cause local or system wide blackouts. This has provoked many utilities to adopt low voltage ride-through (LVRT) for wind turbines. The requirement places an added interconnection cost on the manufacturer and will influence the overall financing of the project. This paper presents the LVRT characteristic, reviews the effect that voltage dips have on the operation of the different wind generator topologies and considers the technical requirements for its realization. System studies demonstrate its benefits while establishing a relationship between the shape of the characteristic and the strength of the interconnection. Results suggest that for stronger systems the profile may be excessive whereas for weak interconnections the demands placed upon the manufacturer are likely warranted.

http://ieeexplore.ieee.org/search/srchabstract.jsp?tp=&arnumber=1489659&queryText%3Dlvrt%26openedRefinements%3D*%26searchField%3DSearch+All

 

德国关于风电场低电压穿越要求及测试(LVRT Workshop Beijing 06/07 January 2009

http://www.cwei.org.cn/upload/FckeditorFiles/4-1-Dr_Karl-Heinz%20Weck-Low-Voltage%20Ride%20Through%20(LVRT)%20Requirements%20and%20Testing.pdf

 

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