功率圆确定稳定约束的可用输电能力分析

提出一种考虑功角和电压稳定约束计算可用输电能力的新方法。针对功角和电压稳定约束表达复杂的问题，首先基于功率圆推导出线路传输有功功率极限值，分析表明，当电力系统发生功角失稳或电压失稳前，输电网络中至少有1条线路输送的有功功率达到其传输有功功率极限。因此，用线路传输有功功率极限近似简洁地表达这2种复杂约束的方法，建立考虑功角和电压稳定约束的可用输电能力新模型。运用逐点线性化方法实现问题求解。算例仿真与分析的结果表明该文的方法有效、可行。

A Novel Algorithm for Calculating Available Transfer Capability Using Power-circle Determine Stability Constraints

A new method for calculating available transfer capability (ATC) in consideration of angle stability and voltage stability is presented in this paper. This method is aimed at the problem of complex expression of the angle stability and voltage stability constraints. Based on power-circle, it deduces a simplified formulation of line transfer stability limits and shows that when a transfer takes place in the system, at least one line reaches its transfer stability limits before the instability is occured. Then it is integrated into standard optimal power flow (OPF) formulation, and set up a new ATC model considering angle stability and voltage stability. The problem here is solved by successive linear programming. The result shows that the proposed model and algorithm is effective and feasible.