CN1246972A - 交流电机的串联补偿 - Google Patents

交流电机的串联补偿 Download PDF

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CN1246972A
CN1246972A CN98802272A CN98802272A CN1246972A CN 1246972 A CN1246972 A CN 1246972A CN 98802272 A CN98802272 A CN 98802272A CN 98802272 A CN98802272 A CN 98802272A CN 1246972 A CN1246972 A CN 1246972A
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alternating current
layer
network
winding
cable
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CN1104767C (zh
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马茨·雷永
拉斯·格尔特马尔
詹-安德斯·尼格伦
皮特·坦普林
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Abb Asiya Brown Bofari Co
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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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/15—Machines characterised by cable windings, e.g. high-voltage cables, ribbon cables
    • 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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S174/00—Electricity: conductors and insulators
    • Y10S174/13—High voltage cable, e.g. above 10kv, corona prevention
    • Y10S174/14—High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding
    • Y10S174/15—High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding in a power generation system, e.g. prime-mover dynamo, generator system

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

本发明披露了一种串联补偿旋转交流电机(2)的方法,所述交流电机直接地或者通过静态电流变换器(28)和三相配电网或输电网(6)相连,其中交流电机的定子绕组是Y连接的,用于电压的基本频率的电容电路(14)被连接在每相中的绕组的下侧和配电网或输电网(6)的接地点(20)之间。还披露了一种用于这种串联补偿的装置,该装置包括被连接在每相中的绕组的下侧和配电网或输电网(6)的接地点(20)之间的用于电压的基本频率的电容电路(14)。

Description

交流电机的串联补偿
本发明涉及一种用于补偿交流电机的方法和装置，所述交流电机直接地或通过静态电流变换器和三相配电网或输电网相连，其中交流电机的定子绕组是Y连接的。本发明还涉及一种具有这种串联补偿装置的旋转电机。
本发明主要涉及用作在电站中发电的发电机的交流电机。一种典型的运行范围可以是36-800kV，使得它们可以和所有类型的高压电网直接相连。由于使用具有类似于输电电缆的固态绝缘的高压绝缘电导体，所以这是可能的，这种电缆下面称为高压电缆。这种电缆还具有外部半导体层，借助于外部半导体层，其相对于周围环境的电位被限定。
一种导体通过US 5036165被公知了，其中绝缘配备有由半导体热解的玻璃纤维(semiconducting pyrolized glassfiber)制成的内层和外层。对于电机中的导体提供这种绝缘也是公知的，例如US5066881所述，其中半导体热解的玻璃纤维层和形成导体的两个平行杆接触，并且在定子槽中的绝缘被半导体热解的玻璃纤维包围着。据说热解的玻璃纤维材料是合适的，因为即使在浸渍处理之后，其仍然保持其电阻率不变。
在高压输电网和高压配电网方面的串联补偿已经被公知了。
在高压输电网和高压配电网方面的串联补偿已经被公知了。还熟知地磁感应的电流可以在直接接地的电网系统中引起有害的发热。
由US A1 4341989还公知了一种装置，其用于多相旋转交流电机的相位补偿，其中每个相绕组在其上部串联或并联连接电容元件。
本发明的目的在于提供一种新的方法和新的装置，用于通过相关交流电机的串联补偿降低系统电抗，并用于阻止地磁感应的电流。
这一目的是通过前言所述的那类方法和装置实现的：一种串联补偿旋转交流电机的方法，所述交流电机直接地或者通过静态电流变换器和三相配电网或输电网相连，其中交流电机的定子绕组是Y连接的，其特征在于，用于电压的基本频率的电容电路被连接在每相中的绕组的下侧和配电网或输电网的接地点之间。
一种串联补偿旋转交流电机的装置，所述交流电机直接地或者通过静态电流变换器和三相配电网或输电网相连，其中交流电机的定子绕组是Y连接的，其特征在于，用于电压的基本频率的电容电路被连接在每相中的绕组的下侧和配电网或输电网的接地点之间。
因而，按照本发明，所述补偿在绕组的下部进行，使得可以使用低电压绝缘的电容器，这在按照现有技术的高压输电网中利用串联补偿时是不可能的。因此，在按照本发明的装置中，可以使用成本低的电容器，因为它们受到电机本身的保护，并且和中性点相连，而中性点处于低的对地电位。这方法对于本发明涉及的那种电机尤其有利，因为这种电机的上部旨在直接和高压电网相连。
按照本发明的装置的优选的实施例，过电压保护装置和电容器并联，使得它们被保护不遭受在故障状态下可能出现的过电压。
按照本发明的装置的第二个优选实施例，在由电容器组成的电容器组的Y点和输配电网的接地点之间设置带阻滤波器，可以在带阻滤波器和接地点之间连接低欧姆的电阻。该电阻可以是中性点电阻，其大小使得可以通过几十安培的无害的接地故障电流。在交流电动机或发电机中的接地故障能够通过这一电阻流过接地故障电流，但是通过控制接地故障电流，可以采取措施断开发电机，或者可以断开故障相。
从电网的观点来看，瞬变电机电抗的任何增加都可以利用这种方式得到补偿。
在按照本发明的电机中，绕组最好用具有固态的挤压绝缘的电缆制成，这类电缆现在用于配电中，例如XLPE电缆或具有EPR绝缘的电缆。这种电缆是可弯曲的，这在本发明中是一个重要性能，因为用于按照本发明的电机的技术主要基于绕组系统，其中绕组由在装配期间被弯曲的电缆制成。XLPE电缆的柔性一般相当于对于直径为30mm的电缆，其曲率半径大约为20cm，对于80mm直径的电缆，其曲率半径大约为65cm。在本申请中，术语“可弯曲的”用于指绕组可向下弯曲到4倍于电缆直径的数量级的曲率半径，最好是8倍到12倍电缆直径。
在本发明中的绕组被这样构成，使得即使它们被弯曲时以及在操作期间受到热应力时，也保持其性能不变。极其重要的是，在这种情况下，绝缘层相互之间保持其黏附作用不变。其中绝缘层的材料性能是至关重要的，特别是其弹性和相对热膨胀系数。例如，在XLPE电缆中，绝缘层由交联的低密度聚乙烯制成，半导体层由其中混合有碳黑和金属颗粒的聚乙烯构成。由于温度波动而引起的体积变化作为电缆的半径的变化而完全被吸收，并且，由于在这些层中，相对于这些材料的弹性，其热膨胀系数之间的差别是很小的，所以可以发生半径的膨胀而不损害层之间的黏附作用。
上述的材料组合应当认为只是例子而已。其它的满足规定条件的同时也是半导体的材料，即，其电阻率范围为10-1-106ohm-cm，例如1-500ohm-cm，或10-200ohm-cm，当然也落在本发明的范围内。
例如，绝缘层可以由固态热塑材料制成，例如低密度的聚乙烯(LDPE)，高密度聚乙烯(HDPE)，聚丙烯(PP)，聚丁烯(PB)，聚甲基戊烯(PMP)，交联材料，例如交联聚乙烯(XLPE)，或橡胶，例如乙烯丙烯橡胶(EPR)或硅橡胶。
内外半导体层可以由同一种基本材料但其中混合有导电材料颗粒例如碳黑或金属粉末的材料制成。
这些材料的机械性能，特别是热膨胀系数，受是否加入碳黑或金属粉末的影响相当小，这些材料至少按照所需的比例加入，以便实现按照本发明所需的导电性。因而，绝缘层和半导体层具有基本相同的热膨胀系数。
乙烯-乙烯基-乙酸盐共聚物/腈橡胶，丁基接枝聚乙烯，乙烯-丁基-丙烯酸盐-共聚物以及乙烯-乙基-丙烯酸盐共聚物也可以构成用于半导体层的合适的聚合物。
甚至当使用不同类型的材料作为各个层中的基底时，也需要其热膨胀系数基本相同。上面列出的材料的组合便属于这种情况。
上面列出的材料具有相当好的弹性，其弹性模量E＜500MPa，最好＜200MPa。弹性对于沿径向吸收层中材料的热膨胀系数之间的任何微小差别足够了，使得不出现裂痕或其它的破坏并且各层间不会分离。层中的材料是有弹性的，并且层之间的黏附作用至少和最弱的材料相同。
两个半导体层的导电性足以基本上平衡每层上的电位。外半导体层的导电性足够大，以便包括电缆中的电场，而又足够小，使得不致由于在层的纵向感应的电流而产生大的损耗。
这样，两个半导体层的每层基本上构成一个等位面，并且这些层基本上包封它们之间的电场。
当然，在绝缘层中可以设置一个或几个附加的半导体层。
为了更清楚地说明本发明，将以举例方式参照附图更详细地说明按照本发明的装置的实施例，其中图1表示按照本发明的装置的实施例，图2表示用于按照本发明的旋转电机中的高压电缆的截面图。
图1表示呈发电机形式的交流电机2，其相电压通过绝缘器和断路器4直接和电网6相连。过电压保护装置8和电流测量装置10也被提供在发电机2的输出侧。
发电机2的定子绕组是Y连接的，串联补偿电容器14被连接在绕组下侧的每相中。带阻滤波器16被连接于电容器组的Y点，中性点电阻18被连接在电网6的接地点20。电流测量装置22，24也被提供在发电机2的这一侧。
在每相中通过连接串联电容器14实现交流电机2的串联补偿，借以降低系统电抗。
过电压保护装置26和电阻R被合适地提供，以便在故障状态下保护电容器14。
滤波器16和本发明无关，因而不作详细说明。
中性点电阻18的大小使得把接地故障限制于几十安培的无害大小。因而在发电机2出现接地故障时，可以通过电阻18产生接地故障电流，并通过控制该电流的大小使得能够采取措施断开发电机，并可以断开故障相。
此外，发电机2可以通过变换器28和电网相连，如图1所示。
图1中省略了发电机的激磁部分。
图2表示用于按照本发明的旋转电机中的高压电缆29的截面，高压电缆29包括许多例如由铜制成的并具有圆形截面的线股部分31。这些线股部分31被设置在高压电缆29的中部。第一半导体层32围绕线股部分31，绝缘层33，例如XLPE绝缘层围绕第一半导体层32，第二半导体层34围绕绝缘层33。

Claims (15)

1.一种串联补偿旋转交流电机(2)的方法，所述交流电机直接地或者通过静态电流变换器(28)和三相配电网或输电网(6)相连，其中交流电机的定子绕组是Y连接的，其特征在于，用于电压的基本频率的电容电路(14)被连接在每相中的绕组的下侧和配电网或输电网(6)的接地点(20)之间。
2.一种串联补偿旋转交流电机(2)的装置，所述交流电机直接地或者通过静态电流变换器(28)和三相配电网或输电网(6)相连，其中交流电机的定子绕组是Y连接的，其特征在于，用于电压的基本频率的电容电路(14)被连接在每相中的绕组的下侧和配电网或输电网(6)的接地点(20)之间。
3.如权利要求2所述的装置，其特征在于，每个电容电路包括电容器(14)。
4.如权利要求3所述的装置，其特征在于，过电压保护装置(26)和电容器(14)并联连接。
5.如权利要求2-4任何一个所述的装置，其特征在于，带阻滤波器(16)被设置在由电容器(14)构成的电容器组的Y点和配电网或输电网(6)的接地点(20)之间。
6.如权利要求5所述的装置，其特征在于，低欧姆的电阻(18)被连接在带阻滤波器(16)和配电网或输电网(6)的接地点(20)之间。
7.一种具有在定子槽中设置的绕组的旋转电机，其特征在于，所述绕组使用高压电缆绕制，并且所述电机具有如权利要求2-6任何一个所述的装置。
8.如权利要求7所述的电机，其特征在于，所述高压电缆是这种类型的电缆，其包括具有许多线股部分的缆芯，围绕缆芯的内部半导体层，围绕内部半导体层的绝缘层，和围绕绝缘层的外部半导体层。
9.如权利要求8所述的电机，其特征在于，所述高压电缆具有在20-200mm范围内的直径和在80-3000mm2范围内的导电面积。
10.如权利要求7-9任何一个所述的电机，其特征在于，所述电缆是可弯曲的，并且所述的层相互邻接。
11.如权利要求7-10任何一个所述的电机，其特征在于，所述的层由这样的材料制成，所述材料具有这样的弹性和这样的热膨胀系数，使得在操作期间由于温度波动而引起的各层体积的变化被材料的弹性所吸收，因而在操作期间发生温度波动时，这些层保持其间的相互黏附作用不变。
12.如权利要求7-11任何一个所述的电机，其特征在于，在所述层中的材料具有高的弹性，最好弹性模量小于500MPa，小于200MPa更好。
13.如权利要求7-12任何一个所述的电机，其特征在于，在所述层中的材料的热膨胀系数基本上相同。
14.如权利要求7-13任何一个所述的电机，其特征在于，在所述层之间的黏附作用至少和材料的最弱的强度的大小相同。
15.如权利要求7-14任何一个所述的电机，其特征在于，每个半导体层基本上构成一个等位面。
CN98802272A 1997-02-03 1998-02-02 交流电机的串联补偿装置 Expired - Fee Related CN1104767C (zh)

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SE97003487 1997-02-03
SE9700348A SE512299C2 (sv) 1997-02-03 1997-02-03 Förfarande och anordning för seriekompensering av elektrisk växelströmsmaskin samt maskin försedd med dylik anordning.
SE9704421A SE9704421D0 (sv) 1997-02-03 1997-11-28 Seriekompensering av elektrisk växelströmsmaskin
SE97044218 1997-11-28

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