Abstract
In order to efficiently use energy storage resources while meeting the power grid primary frequency modulation requirements, an adaptive droop coefficient and SOC balance-based primary frequency modulation control strategy for energy storage is proposed. Taking the SOC of energy storage battery as the control quantity, the depth of energy storage output is adaptively adjusted to prevent the saturation or exhaustion of energy storage SOC. The balanced control strategy is introduced to realize the rational utilization of resources and the fast balance of SOC in the process of primary frequency modulation of energy storage battery under different charge states. Then, four evaluation indexes are proposed to evaluate the effect of primary frequency modulation and SOC maintenance. Taking a regional power grid as an example, a simulation analysis is carried out under step load disturbance and continuous load disturbance. According to the simulation results, the proposed control strategy is effective in power system frequency regulation and battery SOC maintenance.
Highlights
In recent years, new energy power generation has developed rapidly
The wind turbine itself is decoupled from the frequency of the power system, and the replacement of traditional units by high-proportion wind power will lead to the weakening of system inertia and the reduction in primary frequency modulation capacity [2]
This paper proposes a comprehensive adaptive control strategy for primary frequency modulation of energy storage based on SOC feedback
Summary
New energy power generation has developed rapidly. By the end of. The randomness and volatility of new energy generation become more prominent when it is connected to the grid on a large scale, which will bring greater power disturbance to the power grid [3,4,5,6] This suggests that under such dual pressure, there is an urgent need to make up for the lack of primary frequency modulation capacity in the traditional way with the help of new frequency modulation means. Reference [10] puts forward a droop control strategy for energy storage battery participating in power grid frequency regulation. The SOC of energy storage battery is considered in reference [14], the regulation strategy of fixed power output participating in power grid frequency is still adopted. Taking the regional power grid as an example, the effectiveness of the proposed control strategy is verified by simulation under the condition of step load disturbance and continuous load disturbance
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