地区电网备自投在线投退控制策略(二)考虑备用电源侧可用供电能力的备自投控制策略

Online control strategy of busbar automatic transfer switch for regional power grids(2):control strategy considering available supply capability of standby power

由于投入备自投装置时,没有充分考虑备用电源侧元件热稳定极限的影响或其他相关母线的电压越限情况,导致连锁故障发生,会使故障进一步扩大。在考虑备用电源所在电网的网架结构、运行方式以及负荷水平的条件下,建立了备用电源侧可用输电能力实时在线评估数学模型,并应用重复潮流法,对该模型进行了求解,将所得结果作为备自投装置动作与否的决策依据。对重复潮流方法进行了详细介绍,并给出了相应的程序流程图。最后利用某地区在线SCADA数据对上述方法进行了验证,结果表明该方法可真实反映备用电源侧的可用输电能力,整个迭代过程中潮流计算一般在20次以内,适合在线应用。

Cascading failures may occur if the influence of the component thermal stability limits at standby power supply side and the voltage limits of relevant bus is not carefully considered during BATS（Busbar Automatic Transfer Switch） operation.A real-time mathematical model for online assessing the available supply capability of standby power is established with the consideration of network structure,operating mode and load level.The repetitive power flow method is used to solve it and the obtained results are used to decide if the BATSs should act.The repetitive power flow method is introduced with flowchart,which is validated with the online regional SCADA data.Result truly indicates the available supply capability of standby power and the iterative time of power flow computation is generally less than 20,suitable for online application.