CN1524162A - 风力涡轮机的工作方法 - Google Patents
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Abstract
本发明涉及风力涡轮机的工作方法,该风力涡轮机带有由转子驱动的发电机,用于将电能送至高压输电线路网,特别是送至与其连接的用户。本发明的目的是提供风力涡轮机的工作方法和风力涡轮机或风能工厂。与不具有风力涡轮机的情况相比,该风力涡轮机或风能工厂即使在具有可变的有效功率输出时,也可以减小或不显著增加在网络中给定点处的不理想的电压波动。本发明还涉及风力涡轮机的工作方法,其具有由转子驱动的发电机,用于将电能送至高压输电线路网,特别是与其连接的用户,其特征在于相角φ根据在高压输电线路网上确定的至少一个电压而改变。
Description
技术领域
本发明涉及风力涡轮机的工作方法,该风力涡轮机带有由转子驱动的发电机,用于将电能送至高压输电线路网(electric grid),特别是送至与其连接的负载。
本发明还涉及用于实现上述方法的风力涡轮机,它包括转子和与该转子连接用于将电能送至高压输电线路网的发电机;本发明还涉及具有至少两个风力涡轮机的风能工厂(wind farm)。
背景技术
在已知的由风能产生电能的风力涡轮机中,带有电气负载(通常为高压输电线路网)的发电机以与高压输电线路网平行的模式工作。在风力涡轮机的工作过程中,发电机提供的非电抗性功率可以根据当前风速而改变。这可造成如下情况,例如在进给点处,高压输电线路网的电压也可以根据当前风速而变化。
然而,当将产生的电能输送至高压输电线路网(例如公共电力高压输电线路网)时,结果使高压输电线路网中的电压波动。但是为了使连接的负载可靠地工作,这种波动只在非常有限的范围内才是允许的。
在供给高压输电线路网中,高压输电线路网电压对于参考值的较大偏离(特别是中间高电压电平)可通过起动切换装置(例如步进式变压器)来补偿,即,通过当实际值超过或低于预定阈值时起动切换装置。这样,在预先确定的公差范围内基本上保持高压输电线路网的电压恒定。
发明内容
本发明的目的是提供风力涡轮机的工作方法,以及提供风力涡轮机和/或风能工厂。与没有风力涡轮机的情况相比,所述风力涡轮机和/或风能工厂即使当非电抗性功率的输出波动时,也能够减小或至少是不显著增加高压输电线路网中预先确定的点处的不需要的电压波动。
本发明利用开始所述方法达到该目的,借助该方法,由风力涡轮机供给的电能输出的相角φ可根据在高压输电线路网中测量的至少一个电压改变。
在开始所述的风力涡轮机中,该目的是通过能够实行本发明方法的装置达到的。
在开始所述的风能工厂中,本发明的目的通过这样的风能工厂达到,其对于风能工厂每一个可单独控制的部分具有至少一个可以实行本发明方法的装置和一个电压检测装置。
通过根据负载或高压输电线路网的电压改变供给电能的相角,本发明避免了供给至负载的电压、特别是高压输电线路网的电压的不需要的波动。其补偿了由风力涡轮机供给的非电抗性电能的改变和/或负载从高压输电线路网上取出的电能的改变所引起的不需要的电压波动。
特别优选的是,相角改变使得在高压输电线路网的至少一个预先确定的点处,电压基本上保持为常数。为了确定所需求的参数值,必需在高压输电线路网的至少一个点上测量电压。
特别是,所述的点可以与进给点不同。通过这样测量电压和适当地改变由风力涡轮机供给的电能的相角,可以得到快速响应和功率输出的有效调节。
在一个特别优选实施例中,相角φ的设定值由预先确定的参数值推导出。所述参数值优选可以设置为一张表,该表中包含可推导出要设定的相角的离散值形式的预先确定的一族特性。
在本发明的一个优选实施例中,当电压波动超过预先确定的阈值时,通过起动在高压输电线路网中的一个开关装置,例如步进式变压器,调节***可以直接或间接地使电压回到公差范围内。同时和另外地,在一个预先确定的时期内,可将相角设定为恒定的值,最好为平均值,例如零,以便通过适当地调节相角,可以补偿接着产生的任何电压波动。
在本发明的一个优选实施例中,可以在高压输电线路网的分立的电气部分上,单独地进行电压测量和相角调节,以便调节每一个部分,使每一个所述部分的电压基本上保持固定不变。
根据本发明的风力涡轮机最好带有一个包括微处理器的调节装置,因为这样可对风力涡轮机进行数字调节。
开始所述的风能工厂的每一个单独控制部分,最好包括一个电压测量装置和一个能够实行根据本发明的方法的装置,使得可以单独地调节高压输电线路网的电气上断开的部分,使高压输电线路网每一部分的电压基本上保持为常数。
附图说明
现参照附图和根据风力涡轮机工作方法的实施例来说明本发明。附图中:
图1为将电能送至高压输电线路网的风力涡轮机的简图;
图2为根据本发明的用于操纵风力涡轮机的控制装置;
图3为表示高压输电线路网的电压和相角之间的相互关系的视图;
图4为图2所示的调节装置的基本部分;和
图5为多个风力涡轮机的取决于高压输电线路网情况的公共或分立的调节***的简图。
具体实施方式
图1示意地表示的包括转子4的风力涡轮机2与可以为例如公共高压输电线路网的一个高压输电线路网6连接。几个电气负载8与高压输电线路网连接。图1中未示出的风力涡轮机2的发电机与电气控制和调节装置10连接,该控制和调节装置10首先将发电机产生的交流电整流,接着将电流转换为频率与高压输电线路网频率相适应的交流电。控制和调节装置10具有根据本发明的调节装置。
在高压输电线路网6的任意点22处,可以设置电压检测装置22,其将相应的参数值返回至控制和调节装置10。
图2表示根据本发明的调节装置。以简单形式表示的转子4与发电机12连接,该发电机可根据风速提供一定量电能。发电机12产生的交流电压开始经过整流,接着被转换成频率与高压输电线路网的频率相适应的交流电压。
在高压输电线路网6中位置22处的电压用电压传感器(未示出)测量。根据测量的高压输电线路网的电压,计算最优的角度φ;如果必要,可借助微处理器,如图4所示那样。
利用调节装置,将高压输电线路网的电压U调节至所希望的值Uref。通过改变相角,调节由发电机12输送至高压输电线路网6的电能。
图3表示高压输电线路网的电压与相角之间的关系。当电压偏离其位于电压Umin和Umax之间的参考值Uref时,根据图中的功率曲线,相角φ改变,使得根据偏离的极性,电感或电容性的非电抗性电能送至高压输电线路网中,以便稳定在电压测量点(图1中的标记22)上的电压。
图4表示图1所示的控制和调节装置10的主要部分。该控制和调节装置10包括使发电机产生的交流电整流的一个整流器16。与整流器16连接的频率转换器18将开始经过整流的直流电转换为交流电,然后通过线路L1,L2和L3作为三相交流电送至高压输电线路网6。
频率转换器18由构成整个调节装置一部分的微处理器20控制。为此,微处理器20与频率转换器18连接。微处理器20的输入参数为当前的高压输电线路网的电压U,发电机的电功率输出P,高压输电线路网电压参考值Uref和功率梯度dP/dt。根据本发明,将要输送至高压输电线路网的电流在微处理器20中改变。
图5中,作为风能工厂的一个例子,表示了两台风力涡轮机2。所述风力涡轮机2(当然也可以象征性地表示多台风力涡轮机)中的每一台都配备一个调节装置10。在高压输电线路网6,7的预先确定的点22,27上,调节装置10测量电压,并将该电压值通过线路25,26传送至相应配备的调节装置10。
高压输电线路网的两个部分6,7可以通过开关装置23互相连接,或彼此断开。与所述开关装置23平行,还设置有一个开关装置24,该开关装置24可根据开关装置23的状况,使两个调节装置10彼此连接或断开。
这样,如果高压输电线路网的两个部分6,7互相连接,则两个调节装置10也互相连接,使整个高压输电线路网被看成是一个整体,并作为一个整体从整个风能工厂获得电能供应;而风能工厂本身作为一个整体,可根据测量点22,27上的电压进行调节。
如果高压输电线路网的两个部分6,7被开关装置23断开,则调节装置10也彼此断开,使得高压输电线路网的一部分从线路25上的测量点22由调节装置10监视;风能工厂的指定部分也被相应地调节,同时高压输电线路网的另一部分7则从线路26上的测量点27被调节装置10监视,该调节装置相应地调节风能工厂的这个另一部分,以便稳定高压输电线路网上的这个另一部分7的电压。
当然,这种细分不需要只限制在两个高压输电线路网部分。这种细分还可以扩展至与高压输电线路网的一个部分连接的一台风力涡轮机。
在如下情况下,即上述调节***在测量高压输电线路网参数中的公差范围与在高压输电线路网中已经有的开关装置(步进式变压器)的公差范围不同,在特定情况下两个装置-上述调节器和开关装置-可以互相影响,产生一种“ping-pong”效应。这时,步进变压器切换,由此改变高压输电线路网的电压,使如上所述根据本发明的调节方法进行控制。由于调节***这样进行控制,高压输电线路网中的电压改变,使步进式变压器再起动等。
为了抵消这个不希望的“ping-pong”效应,在本发明的另一个实施例中,可以提供由开关装置(如,步进式变压器)得出的测量结果作为根据本发明的调节装置的输入信号。虽然,这个实施例可能包括测量结果不太精确的缺点,但它消除了部件连续、相互地互相影响的危险,从而可达到本发明的目的。
在本申请中所述的相角为从风力涡轮机的发电机送至高压输电线路网的电能的电流和电压之间的角度。如果相角为0°,则只供应非电抗性电能。如果相角不等于0°,则除了非电抗性电能以外,还供应一部分电抗性的电能,因此,相角的改变不一定表示表观功率的增加或减小,而是总的表观功率可以保持为常数,但电抗性和非电抗性电能的相应比例可根据设定的相角变化。
如上所述,本发明的一个目的是减少在高压输电线路网中的一个预先确定的点处的电压波动,或至少当风力涡轮机工作时,使电压波动的增加不显著。为此,为了补偿电压波动,本发明可使由风力涡轮机(或由风能工厂)输送的电能的相角可以相应地改变。
通常在高压输电线路网中与风力涡轮机连接的装置(即,步进式变压器-未示出)基本上可起相同作用。由于步进式变压器可以通过开关工作改变功率传递比例,因此可以同样影响高压输电线路网中的电压,或至少是变压器次级侧的电压。然而,这只有在与步进式变压器的切换步骤相应的步骤中才有可能。
这种步进式变压器通常具有测量高压输电线路网的电压的装置。当这个电压超过或低于预先确定的阈值时,步进式变压器的切换工作起动,使高压输电线路网的电压回到允许变化的预先确定的范围内。
根据本发明的风力涡轮机的实施例或其变换器监视高压输电线路网中的电压,并利用相应的措施保持所述电压在预先确定的公差范围内。由于这些公差范围不是完全相同的,有时会出现风力涡轮机和步进式变压器彼此相反工作的情况:步进式变压器交替地向上和向下步进,而风力涡轮机则交替地按相反方式使电压降低和升高。容易理解,这会使高压输电线路网的电压稳定性变差。
为了避免刚才所述的作用,本发明因此提出:首先,在高压输电线路网的不是进给点的一个点处测量电压,该电压是风力涡轮机的一个可测量的变量;和/或其次,调节***可以直接或间接地起动高压输电线路网中的开关装置。高压输电线路网中的所述另一个点可以为步进式变压器,使得变换器由与步进式变压器相同的电压值进行控制。首先,这可以避免步进式变压器和变换器互相以其不同的公差起反作用。其次,风力涡轮机可以通过适当地将电抗性电能送入高压输电线路网,而触发步进式变压器的切换工作(间接起动);或者在控制线路上(直接地)进行这种切换工作。
从网络操作者的观点来看,还希望风力涡轮机产生可转移至步进式变压器的另一侧的电抗性电能。然而,由于送入电抗性电能会导致高压输电线路网电压的改变,这间接地使步进式变压器起动,这是不希望的,因此在这种情况下也是起相反作用的。
根据本发明的解决方法是利用步进式变压器精确地抑制这种切换工作,即向上或向下步进。为了能够将所希望的电抗性电能转换至步进式变压器的另一侧,这种方式的抑制步进为所谓的开关的“不起动”。
Claims (10)
1.风力涡轮机的工作方法,该风力涡轮机带有由转子驱动的发电机,用于将电能送至高压输电线路网,特别是送至与其连接的负载;
其特征在于,相角φ根据在高压输电线路网中测量的至少一个电压而改变。
2.如权利要求1所述的方法,其特征在于,相角φ改变,使得在高压输电线路网中的至少一个预先确定的点处电压基本上保持不变。
3.如上述权利要求中任一项所述的方法,其特征在于,电压在高压输电线路网中的至少一个预先确定的点(22,27)处测量。
4.如上述权利要求中任一项所述的方法,其特征在于,电压在与进给点不同的点(22,27)处测量。
5.如上述权利要求中任一项所述的方法,其特征在于,相角φ设定的值由预先确定的参数值推导出来。
6.如上述权利要求中任一项所述的方法,其特征在于,调节***可以直接或间接地起动在高压输电线路网中的开关装置。
7.如上述权利要求中任一项所述的方法,其特征在于,根据相角φ,对高压输电线路网的各部分可以单独进行相应的电压测量和调节。
8.风力涡轮机,其特征在于,它具有实行如上述权利要求中任一项所述方法的装置(10)。
9.风能工厂,其带有至少两个风力涡轮机,其特征在于,它具有实行如上述权利要求中任一项所述方法的装置(10),以及对于风能工厂的每一个单独可控制部分的专用电压检测装置(22,27)。
10.如上述权利要求中任一项所述的***,其特征在于,在电压达到预先确定的参考值之前,根据在高压输电线路网中测量的至少一个电压,相角通过电容或电感而改变。
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2001
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Cited By (12)
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US7392114B2 (en) | 2001-09-28 | 2008-06-24 | Aloys Wobben | Method for operating a wind park |
US7638893B2 (en) | 2001-09-28 | 2009-12-29 | Aloys Wobben | Method for operating a wind park |
US7830029B2 (en) | 2001-09-28 | 2010-11-09 | Aloys Wobben | Method for operating a wind park |
US8301313B2 (en) | 2001-09-28 | 2012-10-30 | Aloys Wobben | Method of reducing power provided by a wind power installation based on network conditions |
CN101771279A (zh) * | 2008-12-31 | 2010-07-07 | 通用电气公司 | 风力涡轮机的启动 |
CN102130604A (zh) * | 2010-01-14 | 2011-07-20 | 西门子公司 | 用于变换电功率的变换器设备和方法 |
CN102130604B (zh) * | 2010-01-14 | 2014-12-24 | 西门子公司 | 用于变换电功率的变换器设备和方法 |
US8946946B2 (en) | 2010-01-14 | 2015-02-03 | Siemens Aktiengesellschaft | Converter device and method for converting electrical power |
CN102570494A (zh) * | 2010-10-25 | 2012-07-11 | 通用电气公司 | 用于风力涡轮和风力涡轮发电站的电力传输***及其操作方法 |
CN102570494B (zh) * | 2010-10-25 | 2016-02-03 | 通用电气公司 | 用于风力涡轮和风力涡轮发电站的电力传输***及其操作方法 |
CN103765717A (zh) * | 2011-08-23 | 2014-04-30 | 乌本产权有限公司 | 用于驱动风能设备的方法 |
CN103765717B (zh) * | 2011-08-23 | 2017-04-19 | 乌本产权有限公司 | 用于驱动风能设备的方法 |
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