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| 摘要: |
| 提出了一种适用于超高压系统的可控电抗器,其容量可根据系统状态动态调节,且可以有效抑制各类过电压。分析了超高压系统中工频过电压产生的原因,阐述了研究工频过电压的条件。介绍了超高压可控电抗器的结构,分析了其工作原理。选择一条实际线路为例建立了EMTP仿真模型,对500 kV架空线路加装可控电抗器后两侧的断路器分别出现三相跳闸情况下母线侧和线路侧不同状态下的工频过电压进行了仿真计算,并与传统固定容量并联电抗器进行了比较,结果显示不同工况下可控电抗器对工频过电压的抑制效果明显,能起到传统固定容量的并联电抗器的作用。可控电抗器能够有效抑制超高压系统中的工频过电压并可动态调节自身容量,在超、特高压系统中具有广阔的应用前景。 |
| 关键词: 超高压,工频过电压,可控电抗器 |
| DOI： |
| 分类号:TM477 |
| 基金项目: |
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| Restraint of power frequency over-voltage by controllable reactor in EHV system |
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XING Haiying CHEN Baichao TIAN Cuihua
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| Abstract: |
| A kind of controllable reactor for EHV system is presented which can dynamically adjust its capacity according to system conditions and effectively restrain various over-vohages.The causes of power-frequency over-voltages in EHV system are analyzed and its study conditions are introduced.The structure and working principle of the controllable reactor are explained.The EMTP model of a real 500 kV transmission line with controllable reactor is established and the power -frequency over-voltages at both bus side and line side are respectively calculated for the 3-phase breaker trip at bus side and line side.The result shows that,the power-frequency over-voltages are suppressed as effectively as the parallel reactor of fixed capacity.Because of its functions of power -frequency over-voltage restraint and capacity adjustment,the controllable reactor will have wide application prospects in EHV and UHV systems. |
| Key words: EHV,power frequency over- voltage,controllable saturated reactor |
