Optimal Ratio of Wind-Solar-Storage Capacity for Mitigating the Power Fluctuations in Power System with High Penetration of Renewable Energy Power Generation

doi:10.12204/j.issn.1000-7229.2023.03.014

Abstract

Abstract:

The development of renewable energy is a fundamental measure to resolve environmental pollution and energy crisis, and achieve the carbon peaking and carbon neutrality goals. However, the inherent volatility and fluctuation of renewable energy output bring unprecedented challenges to the planning and operation of the power grid. This paper studies the optimal ratio of renewable energy and energy storage, aiming to minimize power fluctuation. According to the complementary nature of wind and solar resources, the mode of optimal ratio of wind and solar power that leads to minimal power fluctuation is established and is further transformed into linear programming. The optimization problem of energy storage capacity aiming to smooth the renewable energy output is formulated as a multi-parameter linear program, where storage charging power and energy capacities are parameters. The power fluctuation index is expressed as an analytical function in storage parameters, which is convex and piecewise linear. On the basis of the fluctuation index function, the optimal storage capacities can be determined according to the costs. The proposed method provides an illustrative tool and more abundant information for policy and decision-making.

Key words: renewable energy, energy storage, capacity ratio, parametric programming, fractional programming

CLC Number:

TM715

WEI Wei, FAN Yue, XIE Rui, BAI Jiayu, MEI Shengwei. Optimal Ratio of Wind-Solar-Storage Capacity for Mitigating the Power Fluctuations in Power System with High Penetration of Renewable Energy Power Generation[J]. ELECTRIC POWER CONSTRUCTION, 2023, 44(3): 138-147.

Figures/Tables 15

Fig.1 Calculation flow chart of optimal capacity configuration

Fig.2 Boxplot of wind power generation

Fig.3 Boxplot of photovoltaic power generation

Fig.4 Boxplot of load power

Table 1 Parameters

Fig.5 Typical power fluctuation under the optimal ratio of renewable energy for independent renewable generation system

Fig.6 Power fluctuation index under different wind proportion

Fig.7 System power fluctuation index function for independent renewable generation system

Fig.8 Feasible region of energy storage capacity for independent renewable generation system

Fig.9 Typical power fluctuation under the optimal ratio of renewable energy for electric system powered entirely by renewable energy

Fig.10 System power fluctuation index function for electric system powered entirely by renewable energy

Fig.11 Feasible region of energy storage capacity for electric system powered entirely by renewable energy

Fig.12 Typical power fluctuation under the optimal ratio of renewable energy for general power system with renewable energy

Fig.13 System power fluctuation index function for general power system with renewable energy

Fig.14 Feasible region of energy storage capacity for general power system with renewable energy

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