考虑AGC调节大容量风电波动性的机组优化调度

Distribution of Adjusting Fluctuation of Large Capacity Wind Power Considering AGC

随着大量风电并网,其出力的波动对电网的安全造成了很大的影响,风电波动不同于传统的负荷波动,其波动速度更快,只依靠传统的旋转备用在经济调度中进行调节,不能完全解决由于风电出力的快速变化而给系统带来的实时功率不平衡问题,这就需要自动发电控制(AGC)来快速平衡系统功率。为此提出了考虑AGC调节大容量风电快速波动性的机组组合模型,该模型在机组组合问题中同时考虑了经济调度和AGC的相关约束,将机组组合、经济调度和自动发电控制这3种调度调节方法紧密联系到一起,在保证系统的AGC容量和AGC爬坡能力约束满足安全需求的前提下,提高系统整体经济性;同时运用Benders分解技术,将原问题分解成2个规模较小的子问题迭代求解,从而减小了计算负担并加快计算速度。

As a large amount of wind power connected to the power grid,the fluctuations of wind power have a influence on the safety of the power grid.There is some difference between the wind power fluctuation and the traditional load fluctuation.The wind power fluctuation is much quicker than the traditional load.Only relying on traditional spinning reserve to be adjusted in the economic dispatch,it cannot completely solve the problem of power imbalance due to rapid changes in wind power output to the power system.Therefore the AGC(Automatic Generation Control)is needed to quickly balance the system power.A UC(unit commitment)model which considers AGC to adjust the rapid fluctuation of wind power is proposed.This model considers both economic dispatch and AGC constraints in the UC problem.The unit combination,economic dispatching and automatic generation control are closely linked together.On this premise that the AGC capacity and AGC ramp capacity can guarantee the security of power system.This model can improve the economy of the system.To reduce the computation burden and to increase the computing speed,the original problem is decomposed into two sub-problems by Benders decomposition technique.