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由于机组的初加速度与其到故障点的电气距离成反比,故失稳机群一般都在故障点附近。但在对互联大电网的仿真中却发现了远离故障点的机群失稳的实例,并进一步发现故障点附近的负荷变化不但可能改变临界群或失稳摆次,并且可能同时改变两者。用扩展等面积准则(EEAC)揭示其机理。仿真验证了切机等紧急控制措施对相邻摆次的影响相反,在临界群与在余下群中实施的效果相反。进一步证实,当主导映像上的等值机械功率接近于故障后电功率的非周期分量时,失稳模式很可能发生分岔。
Since the initial acceleration of the unit is inversely proportional to the electrical distance to the point of failure, the instability cluster is generally near the point of failure. However, in the simulation of interconnected large power grids, instability of the fleet far away from the point of failure is found. It is further found that the load change near the fault point not only may change the critical group or the instability, but also change both. Expanded isometric principles (EEAC) reveal its mechanism. The simulation verifies that the emergency control measures such as cutting machine have the opposite effect on the neighboring orders, and the opposite group is implemented in the critical group and the rest of the group. It is further confirmed that when the equivalent mechanical power on the dominant image is close to the non-periodic component of the post-fault electric power, the destabilization mode is likely to be bifurcated.