Abstract
The intermittent and stochastic character of the renewable energy resource may lead to instability or even collapse of the distribution network. Against the backdrop, the distributed energy storage unit (DESU) will be a key component to alleviate power fluctuations and frequency instability in the islanded distribution network. However, previous studies mainly account to qualitative analysis of single or multi-machine networks which contain energy storage unit. Motivated by this, we investigate how the DESU affects the frequency stability of the large-scale distribution network. This paper develops a frequency-based control scheme for DESU to change the charging state with frequency. Employing the Kuramoto oscillator model, the dynamic equation of distributed generation (DG) nodes can be obtained to establish an islanded large-scale distribution network model which contains DESU nodes and DG nodes. Through testing the network frequency fluctuation amplitude and the network synchronization time, we explicitly analyze how the DESU enhance the frequency stability of the distribution network. For demonstration purpose, we build a 201-nodes islanded distribution network model which contains DESU nodes and DG nodes to verify the validity of the analysis.
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