考虑频率偏差和电压刚度约束的抽水蓄能机组与新能源场站联合调度方法

Joint scheduling method for pumped storage units and new energy stations considering frequency deviation and voltage stiffness constraints

抽水蓄能机组调频和电压支撑能力能够提升新能源电力系统的安全稳定性。针对电网故障下新能源场站低电压穿越造成的大量能量缺额问题,推导出频率偏差约束的解析表达式;根据电压刚度的定义,推导出新能源场站并网点电压刚度约束表达式。利用多面体不确定集合描述新能源的不确定性,以弃风弃光量最小为优化目标,提出一种考虑频率偏差和电压刚度约束的抽水蓄能机组与新能源场站联合调度方法。在改进的IEEE 39节点系统中对所提方法进行测试,结果表明合理利用抽水蓄能机组可以有效抑制新能源波动并提高系统频率和电压稳定性。

The pumped storage units’ability of frequency regulation and voltage support is utilized to en⁃hance the safety and stability of new energy power system.Aiming at the large energy shortage problem caused by low-voltage ride-through of new energy stations under grid fault,the analytical expression of the frequency deviation constraint is deduced.According to the definition of the voltage stiffness,the voltage stiffness constraints for grid-connected points of new energy stations are established.Using the polyhedron uncertain set to describe the uncertainty of new energy,a joint scheduling method for pumped storage units and new energy stations is proposed,taking into account frequency deviation and voltage stiffness constraints,with the optimization goal of minimizing the amount of wind and solar energy abandoned.The testing is conducted on a modified IEEE 39-bus system,and the results show that the utilization of pumped storage units can effectively suppress new energy fluctuations and improve system frequency and voltage stability.