Abstract
The replacement of traditional fossil fuels by renewable energy sources (RESs) leads to the loss of power grid's frequency support capability while reducing the greenhouse effect. To improve the primary frequency reserve (PFR) and the inertia response (IR) of the grid, a configuration method for an energy storage system (ESS) is proposed. The relationship between the maximum power fluctuation that the system can withstand and the proportion of RESs is deduced in this paper considering the frequency requirements. The capacity and the control parameters of the ESS under the third-order virtual synchronous generator (VSG) control strategy are configured to improve the system's ability to promote energy consumption. Taking the unit power regulation and the inertia constant as references, the contribution of the ESS under different power fluctuations and different control parameters is analyzed. Finally, the simulation results show that the ESS with the proposed methodology has eminent control characteristics and flexible power flow, which can effectively improve the grid's operating environment.
Highlights
With the proliferation of renewable energy sources (RESs) in the grid, there is an increase in the frequency of power fluctuations caused by the switching of loads and generators [1]
To solve the problem of frequency and the rate of change exceeding the limit caused by the lack of inertia response (IR) and primary frequency reserve (PFR) after the power fluctuations generated in the system with different proportions of RESs, an energy storage system (ESS) configuration method with the third-order virtual synchronous generator (VSG) control strategy is proposed based on the maximum power fluctuation, the following conclusions can be drawn from the analysis and simulation experiments
1) Take the frequency requirements as restrictions, the relationship between the proportion of RESs and the maximum power fluctuation in the system can be established based on the related parameters, so as to provide a reference for the necessity of ESS input and the size of the ESS capacity
Summary
With the proliferation of RESs in the grid, there is an increase in the frequency of power fluctuations caused by the switching of loads and generators [1]. The associate editor coordinating the review of this manuscript and approving it for publication was Guijun Li. recovery process [10], a combined frequency regulation control strategy was proposed considering the wind speed fluctuation range in [11], which reduced the oscillation and secondary descent, effectively improving the frequency stability. The related research mainly focused on the improvement of the control strategy and its stability analysis, and the discussion on the basis of ESS configuration and power grid requirements was not sufficient. Considering the frequency requirements represented by the rate of change of frequency (ROCOF) and steady-state frequency deviation (SSFD), some feasible schemes for providing IR or PFR of the system by configuring the ESS were proposed in [20]–[25]. The rationality of the proposed methodology was verified by the simulation model with different proportions of RESs on DIgSILENT/PowerFactory
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