Abstract
With the increase of the renewable energy penetration (REP) level in the interconnected power grid, the proportion of the grid-connected conventional synchronous generators reduces continuously, resulting in the decrease of the system inertia. The insufficient system inertia brings challenges to the system frequency stability. Battery energy storage systems (BESSs), regarded as the high-quality frequency regulation resource, play an important role in maintaining the frequency stability of the system with the high REP level. To configure the proper power of BESSs in system frequency regulation, a BESS power configuration scheme (PCS) considering the REP constraint is proposed in this paper. In particular, the process to obtain the REP boundary of the interconnected grid on the premise of system frequency stability is included in the PCS, and the optimal power configuration of the BESS is further determined on the analysis of the BESS impact on the REP boundary. Furthermore, a simulation model of the Australian five-area interconnected power grid is built in MATLAB/Simulink, and the proposed REP-constrained PCS is verified and analyzed. At last, the promising results show that the PCS can take full advantages of the BESS in frequency regulation and meet the system requirement of the frequency stability at a particular REP level.
Highlights
To reduce the greenhouse gas emission, replacing fossil energy generation by renewable energy generation (REG) has become an inevitable trend in the modern power grid
Based on the former theoretical analysis, the inertia of the control area decreases with the increase of the renewable energy penetration (REP) level, which results in the system frequency instability
This paper proposes a Battery energy storage systems (BESSs) power configuration scheme (PCS) considering the REP constraint on the premise of system frequency stability
Summary
To reduce the greenhouse gas emission, replacing fossil energy generation by renewable energy generation (REG) has become an inevitable trend in the modern power grid. Based on the above theoretical analysis, the BESS participating in the primary frequency regulation can improve the ability of the power system to cope with the load deviations effectively In this way, the aim of the REP level of the interconnected power grid can be guaranteed, and the system frequency deviation can always meet the system stability requirement when the load disturbance occurs under a certain configuration coefficient α. Area #2 and Area #4 are chosen as examples to configure the BESS verifying the influence of BESS on system frequency control in the load center and the renewable generation center Based on the former theoretical analysis, the inertia of the control area decreases with the increase of the REP level, which results in the system frequency instability. The rate of change of frequency and the time to achieve the frequency recovery increase
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