新能源渗透率的提高增加了电网频率控制的复杂度,储能辅助电网调频能在一定程度上缓解该问题,但受储能运行的安全性与经济性约束,要求调频措施更具针对性.文中对此展开研究,提出一种基于频率响应特性的储能辅助电网一次调频方法.首先,在储能辅助电网调频模型基础上,选择惯性加下垂的储能辅助电网调频综合控制方法,通过电网频率变化率(rate of change of frequency,RoCoF)、频率偏差与调频需求的关联性分析,设计基于频率响应特性的调频需求分区规则;然后,根据不同调频需求对应的分区判断,对储能有功输出方式进行动态调整,以响应调频需求的不确定性,并在此基础上,针对调频需求与储能出力需求、储能出力强弱与其循环使用寿命间的矛盾关系,通过多目标优化问题的设计与求解来予以平衡;最后,仿真结果验证了所提方法能够在保证电网调频效果的基础上,有效降低储能充放电深度.
Frequency regulation method assisted by energy storage based on frequency response characteristics
The increase of new energy permeability increases the complexity of power system frequency control.Frequency regulation assisted by energy storage can alleviate this problem to some extent.However,due to the security and economic constraints of energy storage operation,frequency regulation measures need to be more targeted.In this paper,a primary frequency regulation method of power grid assisted by energy storage based on frequency response characteristics is proposed.Firstly,based on the model of frequency regulation assisted by energy storage,the frequency modulation integrated control method of auxiliary energy storage with inertia and droop is selected.Through the correlation analysis of rate of change of frequency and frequency deviation to frequency modulation requirements,frequency regulation demand zoning rules based on frequency response characteristics are designed.Then,according to the partition judgment corresponding to different frequency modulation requirements,the energy storage active power output mode is dynamically adjusted to respond to the uncertainty of frequency modulation requirements.On this basis,aiming at the contradictory relationship between frequency modulation demand and energy storage output demand,energy storage output strength and its cycle life,the multi-objective optimization problem is designed and solved to balance.Finally,the simulation results verify that the proposed method can effectively reduce the depth of charge and discharge of energy storage on the basis of ensuring the frequency modulation effect of power grid.
primary frequency regulationenergy storagefrequency deviationrate of change of frequency(RoCoF)rule-drivenmultiple objective optimization
万方数据
维普
