风火?需求侧响应协调频率控制方法

Coordinated Frequency Control Method of Wind/Thermal/Demand Response

风电场通过电力电子装置接入电网,使风电场所发功率无法对系统频率进行响应。因此,大规模风电接入电网后会使系统总惯性减小,系统调频能力下降,进而影响系统稳定性。为提高系统频率稳定性,研究了风火、需求侧响应参与系统调频的调节方法。考虑调频参数对系统频率稳定性的影响,以及系统频率偏差、频率变化率与火电、风电机组备用容量间的关系,提出一种参数动态整定的风火、需求侧响应参与系统调频的协调控制方法。最后,以内蒙古某地实际系统为例,通过准稳态仿真方法验证了所提协调频率控制方法的有效性。结果表明,所提方法既保证了系统频率稳定性,且使需求侧参与调频的功率较少,提高了系统运行效率。

In case of wind farms integrated to power grids with power electronic devices, power output of the wind farms cannot respond to system frequency variation. Therefore, large-scale integration of wind power will reduce total system inertia and deteriorate system frequency regulation ability, further affecting system stability. In order to improve system frequency stability, frequency control methods of wind/thermal power plants together with demand side response is investigated in this paper. Considering effects of frequency regulation parameters on system frequency stability and relationship in four aspects, i.e. maximum frequency deviation, frequency change rate, reserve capacity of thermal power plants and reserve capacity of wind power plants, this paper puts forward a coordinated control method, through which parameters of wind/thermal power plants together with demand side response are dynamically tuned. Finally, by taking a practical system in Inner Mongolia as example, effectiveness of the proposed control method is verified with quasi-steady state simulation method. Results show that the coordinated control method can guarantee system frequency stability and improve system efficiency as power requirement for frequency regulation from demand side is reduced.