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Abstract
With the rapid development of renewable energy technology, marine current energy is treated as the most desirable form of ocean energies. Due to the nature of marine current energy, simple structure, high reliability, and good control performance are the primary consideration for the energy management strategy. This paper proposes an energy management control strategy based on rules to compensate for the fluctuating power caused by tidal motion. The hybrid energy storage system composed of vanadium redox flow battery (VRB) is applied to reallocate power. Supercapacitor banks (SCBs) are applied as the auxiliary power source to absorb or release the required power according to energy management strategy based on control rules in the marine current power system. SCB makes the grid-connected power track the grid command power and also improves the operational efficiency of the vanadium redox flow battery (VRB). VRB compensates for the low-frequency fluctuating power caused by tidal motion and plays an important role in compensating for the difference in power between the grid-connected power and the grid command power to ensure the reliability of the marine current power system. A simulation model of a 3 MW marine current power system is built to verify the effectiveness of the energy management strategy based on the real marine current velocity data.
Highlights
With the rapid development of renewable energy technology, marine current energy is treated as the most desirable form of ocean energy due to its strong regularity, predictability, and sustainability
Compared with the conventional control strategy, under the control of the rule-based strategy proposed in this paper, the current flows of vanadium redox flow battery (VRB) and Supercapacitor banks (SCBs) over 24 h are shown in Figure 15, respectively
Of Figure 15, if the current of VRB is higher than the threshold value “∆I1 ”, the current of VRB remains the same as the current of the hybrid energy storage system (IHESS ), and the SCB is in a standby state, which is corresponding to the “rule (1)”
Summary
With the rapid development of renewable energy technology, marine current energy is treated as the most desirable form of ocean energy due to its strong regularity, predictability, and sustainability. The model predictive control (MPC) strategy was used to improve the efficiency of the electric vehicles [9,10,11], but the computational complexity may decrease the reliability of the system. Due to the specific characteristics of the marine current power system, such as the fact that the system is underwater and its maintenance is difficult, simple structure, high reliability, and better performance are the main considerations of the energy management strategy. An energy management strategy based on rules is proposed to compensate for the predictable fluctuating power caused by tidal motion. This energy management strategy can make the grid-connected power track the grid command well while improving the operational efficiency of the vanadium redox flow battery (VRB)
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