基于网损等值负荷模型的改进直流最优潮流算法

交流最优潮流因需要处理大量非线性约束,求解效率不高,且在求解含有小阻抗支路和重负荷特征的病态电力系统时,容易出现不收敛的情况;而直流最优潮流计算速度快,可以处理病态电力系统,但是计算精度较低。基于此,文中提出了基于网损等值负荷模型的改进直流最优潮流算法。该算法首先采用网损等值负荷等效替代线路网损,有效地提高了原有直流模型的计算精度;然后使用简化原—对偶内点法进行求解,提高了算法的计算效率。通过对IEEE 30节点、IEEE 300节点、Polish 2736节点和Polish 3120节点系统的测试,证明了所提算法不仅有着较高的计算精度和效率,而且在不依赖于交流潮流解的基础上对于病态电力系统具有较强的处理能力。

Modified Direct Current Optimal Power Flow Algorithm Based on Net Loss Equivalent Load Model

Owing to a lot of nonlinear constraints to be dealt with, the efficiency of alternating current optimal power flow(ACOPF)algorithm is not high. Moreover, it will not converge when handling power systems with small reactance branches and heavy load buses. In contrast, direct current optimal power flow(DCOPF)can solve problems fast and handle pathological power systems but fails accuracy. In the circumstance, a modified direct current optimal power flow(MDCOPF)algorithm based on the net loss equivalent load model is proposed. First, the net loss equivalent load is used to replace the line loss and the accuracy of DCOPF is improved effectively. Then, the MDCOPF is solved by using the simplified primal-dual interior point method to improve the computational efficiency. Finally, the simulation results of IEEE 30-bus, 300-bus, Polish 2736-bus, and 3120-bus test systems prove satisfactory in computational accuracy and efficiency. In addition, it has a strong computing capability for pathological power systems without the solution of the alternating current power flow.