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首页> 外文会议>2000 International Conference on Power System Technology >IMPROVING TRANSIENT STABILITY LIMITS BY DAMPING ACCELERATING ENERGY
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IMPROVING TRANSIENT STABILITY LIMITS BY DAMPING ACCELERATING ENERGY

机译：通过阻尼加速能量来改善暂态稳定极限

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An analysis of the post-disturbance phenomena leading to transient instability has been prompted because of the small magnitude of primary accelerating energy produced by generators near the fault. This has shown that the accelerating energy is greatly multiplied as it flows through the network, past succesive load substations. The analysis has shown that progressing with the outflow of accelerating energy, there is simultaneous a wave of raised frequency as well as a wave of lowered voltages. The voltage wave reduces each substation's load magnitude just as the accelerating energy passes and so causes its amplification. This has shown that a pattern of voltage and frequency changes at each substation can not only identify but also actuate measures for the control of transient stability. A study has demonstrated that local control of the switching of shunt capacitors and reactors at each substation can avert transient instability. Not only is this a low cost approach, but it provides an adaptive arrangement that can respond to disturbances anywhere on the transmission grid to prevent its disruption by transient instability. Compared to the use braking resistors, a fail-safe arrangement is offered which is also effective in damping oscillations after non-critical disturbances.
机译：由于故障附近发电机产生的一次加速能量很小，已经提出了对导致瞬态不稳定性的扰动后现象进行分析的建议。这表明，加速能量在流经电网时，经过连续的负载变电站时，其能量将大大增加。分析表明，随着加速能量的流出而发展，同时出现一波升高的频率和一波降低的电压。电压波会在加速能量通过时降低每个变电站的负载大小，从而导致其放大。这表明，每个变电站的电压和频率变化模式不仅可以识别，而且可以启动用于控制暂态稳定的措施。一项研究表明，对每个变电站的并联电容器和电抗器的开关进行本地控制可以避免瞬态不稳定。这不仅是一种低成本的方法，而且提供了一种自适应装置，可以对传输网格上的任何地方的干扰做出响应，以防止其因瞬态不稳定性而受到干扰。与使用的制动电阻器相比，提供了一种故障安全装置，该装置还可以有效地抑制非严重干扰后的振荡。

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