光伏并网下考虑电网安全约束的机组组合

Security Constrained Unit Commitment with Photovoltaic Grid-Connected

基于Benders算法提出了一种求解光伏并网下考虑安全约束机组组合方法,借鉴两层分解思想,将其分解为无安全约束机组组合和考虑安全约束机组组合的线路潮流检测问题,形成了适合于混合整数规划问题的主问题和子问题的计算方法。针对主问题的检测引入了发电机输出功率转移分布因子及惩罚变量,从安全性和经济性角度实现对该机组组合问题的优化。在MATLAB和CPLEX中以加入光伏的IEEE14系统为测试算例进行仿真,结果显示在满足安全约束的前提下机组组合的总运行成本较无光伏并网时有所下降,表明该方法可以合理协调机组组合中的安全性与经济性。

Based on Benders algorithm, a security constrained unit commitment （SCUC） method with photovoltaic gridconnected is proposed. According to the 2-layer decomposition thought, the SCUC problem is decomposed into the unit commitment without security constraints and the power flow detection in branches considering SCUC, thus the calculation of main problem and sub-problem is formed, which can be solved by mixed integer programming （MIP）. Aiming at the detection of main problem, a shifted distribution factor of generation and a penalty variable are introduced to optimize the SCUC in terms of security and economical efficiency. The simulation in MATLAB and CPLEX indicates that, with the photovohaic grid-connected IEEE 14-node system as a test example and as long as the security constraints are satisfied, the overall running cost of the unit commitment decreases compared with that when the commitment is not photovoltaic grid-connected. It is shown that the proposed method can coordinate the security and economical efficiency for the unit commitment.