水力机组与超级电容协同快速调频策略研究

Research on the Coordinated Fast Frequency Regulation Strategy of Hydraulic Units and Supercapacitors

随着新能源大规模并入电网,系统调节性能和稳定性问题日益突出。该文提出采用同步水力机组结合超级电容储能的协同控制方法,改善了水电机组在调节电网频率以及功率平衡快速性方面的不足。通过研究超级电容的储能原理、工作模式,建立超级电容储能装置和控制模型及水力机组调节系统模型;提出超级电容-水力机组协调控制策略,通过附加超级电容的虚拟惯性控制与虚拟下垂控制来改善机组的调频特性;以Matlab/Simulink平台为基础进行仿真实验,根据水力机组实际容量与容量配置原则来配置超级电容,对比有无超级电容辅助调频时,机组在单机、并网2种工况下受到负荷扰动时的频率响应特性,说明超级电容确实可以辅助同步水力机组调频,验证了所提控制策略的有效性。

With the large-scale integration of new energy into the power grid,the system regulation performance and stability of the power system have become increasingly prominent.In this paper,this paper proposes a coordinated control method for synchronous hydraulic units combined with super-capacitors,and the rapid response of super-capacitors is used to improve the anti-regulation effect of hydraulic units during regulation,which improves the shortage of hydraulic units in the regulation of grid frequency and power balance rapidity.First of all,through the research on the energy storage principle and working mode of the super capacitor,the paper builds the super capacitor energy storage device and its control model and the hydraulic unit regulation system model.Second,the coordinated control strategy for super capacitors combined with hydraulic units is proposed,which improves the frequency regulation characteristics of the unit by adding the virtual inertial control and virtual droop control of the super capacitor.Finally,on the basis of Matlab/Simulink platform,the simulation experiment is carried out,and the super capacitor is configured according to the actual capacity and capacity configuration principle of the hydraulic unit,and the frequency response characteristics of the unit under load disturbance in both stand-alone and grid connected conditions with and without the super capacitor auxiliary frequency modulation are compared,which proves that the super capacitor can indeed assist the synchronous hydraulic unit in frequency modulation,thus verifying the effectiveness of the proposed control strategy.