大规模电网运行方式调整潮流计算及病态诊断

调度和运行方式计算人员经常面临方式变化和调整,迫切需要自动诊断病态潮流并进行运行方式调整潮流计算。为此,文中提出一套工程实用的操作后不平衡功率分摊模拟、潮流数据检查、潮流初值给定、潮流求解病态特性自动识别、病态潮流自动调整的运行方式调整潮流计算方法。采用牛顿—拉夫逊迭代过程中电压幅值和相角衰减指标特性和大小识别病态特征,依据病态特征建立基于内点法最优潮流的病态潮流和无解潮流的自动调整模型,实现大电网运行方式调整潮流计算。采用所提方法对IEEE 14节点系统和实际系统数据进行了病态潮流诊断指标和特征确定及潮流自动调整,结果分析验证了该方法的正确性和有效性。

Power Flow Calculation and Ill-conditioned Diagnosis for Operation Mode Adjustment of Large-Scale Power Systems

As the dispatcher and operation mode personnel are often faced with the changes and adjustments in operation mode, it is urgent to automatically diagnose the ill-conditioned power flow and calculate the power flow in the adjusted operation mode. For this reason, this paper proposes a set of practical methods to calculate power flow for operation mode adjustment, such as unbalanced power allocation after operation, power flow data checking, power flow initial value setting, automatic identification of ill-conditioned characteristics of power flows, and ill-conditioned power flow automatic adjustment. The properties and size of the attenuation index of voltage amplitude and phase angle during NR iterative process are used to identify the ill-conditioned characteristics of power flows. According to the ill-conditioned characteristics, the automatic adjustment models for ill-conditioned and the unsolvable power flows is developed based on the optimal power flow calculation using the interior point method Realising the power flow calculation for operation mode adjustment of large-scale power systems. The method is used to determine the diagnostic indices and characteristics of ill-conditioned power flow in the IEEE 14-bus system and an actual system, while automatically adjusting the power flow. The results show that the method is correct and effective.