Optimal Energy Dispatching Method for Island Microgrid with Ocean Power Generation

doi:10.12204/j.issn.1000-7229.2021.06.010

Abstract

Abstract:

In view of the exclusive characteristics of distributed sources and loads in the island microgrid, an optimal energy dispatching method for island microgrid is proposed in this paper to achieve economic operation while considering renewable power accommodation. Firstly, according to performance analysis of typical ocean power generation, the optimization model of energy dispatching for island microgrid is constructed involving wind power, photovoltaic power, diesel engine generating sets, energy storage devices, wave power, tidal power, and controllable loads. Then, on the two timescales of day-ahead and intra-day, microgrid power dispatch for the day could achieve the global optimum by using mixed integer programming on CPLEX, in which the day-ahead schedule is revised continuously in accordance with the intra-day scrollable calculation results by comparing with the intra-day real-time scrollable deductive results. The analysis shows that, by taking advantage of day-ahead and intra-day combined scrollable calculation, the prediction accuracy of the sources and loads on the island can be improved step by step, and the proposed dispatch optimization method can achieve power balance and higher renewable energy utilization while minimize the operation and maintenance costs of island microgrid.

Key words: island, microgrid, ocean power generation, dispatch optimization

CLC Number:

TM73

NIU Geng, JI Yu, CHEN Peikun, KOU Lingfeng, SUN Shumin, TENG Wei, ZHANG Liwei, CHEN Jikai. Optimal Energy Dispatching Method for Island Microgrid with Ocean Power Generation[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(6): 96-104.

Figures/Tables 10

Fig.1 Structure of island microgrid system

Fig.2 Flowchart of day-ahead dispatching

Fig.3 Flowchart of intra-day dispatching

Table 1 Source capacity configuration and parameters of island microgrid system

Fig.4 Typical daily loads of the island

Fig.5 Prediction curve of distributed renewable energy output on the island

Fig.6 Dispatching situation of typical daily source-load on the island

Fig.7 Battery state of charge

Fig.8 Comparison of unbalanced power without source or load shedding

Table 2 Economic comparison of dispatch schemes元

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