Flexible load regulation margin evaluation method considering virtual energy storage characteristics

doi:10.3969/j.issn.1674-1951.2021.09.005

Abstract

Abstract:

In order to fully tap the regulation potential of flexible load, massive distributed load side resources are led to interacted with the power grid. Thus, the optimal allocation of resources and the improvement of energy utilization efficiency can be realized more economically, efficiently and safely, which is adaptive to the development of smart grid. According to the characteristics of air conditioning load and operation characteristics of electric vehicle and energy storage equipment, the focuses are laid on exploring the virtual energy storage capacity in air conditioning load and charging of electric vehicle. The modelling for virtual energy storage capacity is similar to the general energy storage equipment. Analysing the characteristics of virtual energy storage aggregation model by Monte Carlo simulation method, the available capacity participating in dispatching is obtained. Then, a unified margin control index is proposed to measure the dispatch priority of the three types of loads. Finally, taking the case including air conditioners and electric vehicles as the example, an adjustable capacity which can vary with the outdoor temperature and electric vehicle charging plan is obtained.

Key words: flexible load, demand response, virtual energy storage, direct load control, electric vehicle, air conditioning load

CLC Number:

TM734

WANG Xiyue, XU Jian, LIAO Siyang, KE Deping. Flexible load regulation margin evaluation method considering virtual energy storage characteristics[J]. Huadian Technology, 2021, 43(9): 37-45.

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项目	参数
额定电功率/kW	3
室内温度上限θ_max/℃	27
室内温度下限θ_min/℃	23
设定温度θ_set/℃	25
空调能效比η	3
空气惯性系数ε	0.95
导热性系数A	0.20
热阻R/(℃·kW^-1)	N(16, 0.5²)^①
热容C/(kJ·℃^-1)	N(1 080, 5.0²)^①

项目	参数
额定充电功率/kW	3
充电开始时间	N(17.5, 0.5²)
充电结束时间	N（7.0, 0.5²）
充电效率η_ev	0.92
充电容量E_ev/(kW·h)	48
初始荷电状态S_OC,ev,on	N（0.5, 0.1²）
充电后荷电状态S_OC,ev,off	0.9
电动汽车上、下边界U_up(t), U_down(t) /h	0.1