计及暂态稳定约束的断面功率调整方法研究

Study on Transient Stability Constrained Transmission Section Active Power Flow Adjustment Method

该文提出一种计及暂态稳定约束的断面功率调整方法。通过基于相轨迹凹凸性的暂态稳定裕度对机组有功出力的灵敏度,将暂态稳定约束转化为机组的有功出力约束,结合断面功率对机组有功出力的灵敏度,断面功率增量可表示为机组出力调整量的加权线性组合,从而构建了计及暂态稳定约束的断面功率调整的线性规划模型。给出断面功率的调整流程,依据给定的暂态稳定裕度希望值约束即可确定断面功率及相应的机组出力调整方案。在IEEE39节点系统中的仿真验证了所提方法的有效性。

A new method was proposed to adjust the power of the section with transient stability constraints. Using the sensitivity of transient stability margin based on phase-plane trajectory concavity-convexity to a change in generator active power, transient stability constraints were converted to generator active power constraints. Combined with the sensitivity of section power to a change in generator active power, section power can be expressed by linear superposition of generator active power. Thus, the linear programming model can be established for section power adjustment with the transient stability constraints, and the adjustment procedure was given. According to the desired value of transient stability margin, the generator output and corresponding section power can be determined. The simulation results in the IEEE 39 system validate the effectiveness and feasibility of the proposed method.