交流潮流约束下的机组组合求解

针对当前大电网与分布式发电并进,可再生资源发电大量接入的电网发展格局,构建交流潮流约束下的机组组合模型,在传统考虑有功网络安全约束的基础上,引入无功电压的制约,并计及机组的安全运行极限。依据Benders分解思想,将该模型分解为主、子两个问题,主问题为单母线模型机组组合,子问题为交流潮流约束的检验,通过子问题导引的Benders割形成主、子问题之间关联的附加约束。修正的IEEE-14节点仿真结果表明,该方法能够有效解决交流潮流约束下的机组组合问题。

Unit commitment considering alternating current power flow constraints

With the parallel development of distributed generation technology and large power grid technology,a great amount of renewable energy generation was introduced to the electrical power grid.Under this circumstance,a unit commitment model was established by considering the constraints of transmission safety using AC(alternating current) power flow.This model also involved reactive and voltage constraints,as well as safe operation limits of generators.According to the Benders decomposition,the model was decomposed into a master problem and a sub-problem.The master problem could solve the unit commitment without AC constraints,and then the sub-problem could check the AC constraints according to the result of the master problem.Benders cuts might develop from the sub problem,and the cuts would form additional associated constraints,which could connect the master problem and the sub problem.Simulation results of modified IEEE-14 buses case proved that the proposed method could effectively solve unit commitment problems with constraints of AC power flow.