基于负荷裕度最大化的发电出力优化(二)模型求解

Generation Dispatch Optimization for Maximizing Loading Margin Part Two Model Determination

在修正方向已知的条件下,首先建立了修正步长的优化模型,并通过对前后2次出力方式修正角度的限制,使模型只需进行一次迭代即可确定较优的修正步长,在保证收敛精度的同时大大减小了计算量;然后通过已知的修正方向和步长更新发电机出力方式,并在新的发电机出力方式下重新计算崩溃点,通过交替迭代使负荷裕度和发电机出力方式逐步收敛于最优值。在多个IEEE标准算例上验证了所提出方法的快速、有效性,并根据仿真结果对有功出力优化在提升系统负荷裕度方面的作用进行了总结。

Under the condition of given correction direction, the model for optimal step size is developed first. In addition to the restriction imposed on the permissible correction angle between two sequent generation-directions, a fairly satisfactory step size can be determined by iteration to the constructed model only once, by which the computing effort can considerably be reduced while maintaining convergence precision. Then the generation direction （GD） is updated according to the known correction direction and step size. The collapse point is re-calculated under the new GD. The load margin and GD would gradually converge to the optimum by this alternative optimization method. Finally, the speed and efficiency of the proposed method is verified on multi-IEEE standard test systems, with the effect of generation dispatch optimization on improving the load margin summarized from the simulation results.