Abstract
For developing a large-scale combined system with a number of distributed resources, an appropriate compensation strategy based on the system components and changeable condition must be configured to handle the characteristics of the internal systems. Since renewable sources generate various fluctuations, the compensation plans for the storage device connected along with the sources should be supported by a precise expectation method. A cooperative strategy involving the sharing of the DC section with environmentally sensitive generators, like photovoltaic system (PVs) or waves, demands appropriate ESS compensation solutions, owing to its complexity. An active power-control algorithm with voltage-expectation based on the DC power flow is introduced in this paper and is applied in the designed case studies performed on the electromagnetic transient simulation. DC based multi-generation system is composed by applying tidal generator and super capacitor. To utilize wind energy, an offshore wind–wave generation system was utilized in the verification process.
Highlights
It is expected that the next-generation farm based on renewable generators will be developed from clusters of various distribution sources collaborating with compensation-device applications, which could be performed in sequence by the grid operator to enhance the power-supply capability [1,2]
An energy storage system (ESS) has been consistently utilized for handling the supply and demand issues caused by renewable sources that have unique fluctuation features [3]
Several energy storages are composed with inbuilt complementary modes to respond to grid requirements by focusing on the power fluctuations of renewable sources [13]
Summary
It is expected that the next-generation farm based on renewable generators will be developed from clusters of various distribution sources collaborating with compensation-device applications, which could be performed in sequence by the grid operator to enhance the power-supply capability [1,2]. The ESSs were generally composed separately, which meant that there was an AC section between two different power-conversion systems (PCS) for ESS-renewable sources and that the utilized topologies were focused fully on their own independent DC sections behind inverter devices [18,19] These plans could support reactive power for the rate voltage level at the connection point and it helped the ESSs perform power handling processes with stable operating conditions [20]. The total capacity of the wave–offshore combined generation system can be improved than that of the single renewable source, and it demands an advanced curtailment scheme for maintaining the grid stability which is a main consideration of TSO [33] Such systems should first consider mechanical curtailment scheme with the pitch-controller for the wind system but additional applications are still required. As a various power generation including compensating device is expected in this common DC link, advanced technology will be required based on DC network analysis for maintaining the system performance
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