计及发电机励磁电流约束和电枢电流约束的连续潮流

在传统连续潮流算法中,发电机无功限制采用定上、下限值来处理,随着有功负荷增加,无功限值通常不变,得到的电压稳定裕度偏大。根据同步发电机的无功出力特性,提出同时计及发电机励磁电流约束和电枢电流约束的连续潮流模型和方法。当相应参数越限时,将发电机节点转换为励磁恒定模型或者电枢电流恒定模型进行计算。所提PV、PEq、PIa节点类型双向转换逻辑可在潮流迭代内进行发电机限制模式的转换,模拟实际系统无功能力的变化。分岔点类型识别模块可以识别崩溃点类型及关键约束。通过新英格兰39节点算例的仿真,证明所提算法是有效的。

The Continuation Power Flow Considering Both Generator Excitation Current Limits and Armature Current Limits

In traditional continuation power flow(CPF),the generator’s reactive power limits are handled as constant values,which may lead the load margins overestimated.A novel CPF method considering both excitation current limits and stator current limits was presented.While these limit violations are encountered,the relevant generator bus type was switched into the excitation constant type or the stator current constant type from PV type.PV/PEq/PIadouble switching logic was proposed to convert the type of generator bus in power flow iterations to simulate the reactive power constraints in actual system.A bifurcation point type identification method was also presented to identify the type of the nose points and the corresponding key limit.The numerical simulation results on New England 39 bus system show that the proposed method is effective.