Abstract
To connect renewable energy sources (RESs) with a unity-grid, energy storage (ES) systems are essential to eliminate the weather fluctuation effect, and high voltage direct current (HVDC) transmission is preferred for large-scale RESs power plants due to the merits of low cost and high efficiency. This paper proposes a multi-port bidirectional DC/DC converter consisting of multiple modules that can integrate ES system and HVDC transmission. Thanks to the adoption of three-port converters as submodules (SMs), ES devices, for example, batteries, can be decentralized into SMs and controlled directly by the SMs. Additionally, SMs are connected in a scalable matrix topology, presenting the advantages of flexible power flows, high voltage step-up ratios and low voltage/current ratings of components to satisfy the requirements of HVDC transmission. Furthermore, the control flexibility and fault tolerance capability are increased due to the matrix topology. In this paper, the analysis of the novel modular multi-port converter is introduced, and its functions are verified by the simulation results in PSIM.
Highlights
Solar and wind power are the dominant renewable energy sources (RESs) nowadays, whose average levelised cost of electricity (LCOE) falls within the fossil fuel-fired cost range as USD0.05~0.17/kWh [1]
The high voltage direct current (HVDC) transmission method is preferred for large-scale renewable power plants that have a large output power scale and long-distance transmission because HVDC transmission has the advantages of low cost and high transfer efficiency [4,5,6] compared with the conventional high voltage alternating current (HVAC) transmission
The paper is organised as follows: the basic cell is analysed in Section 2; the scalable topology design, operation and the fault tolerance strategy are discussed in Section 3; Section 4 presents the simulation results to verify the operation of the converter; Section 5 concludes the main points of this paper
Summary
Solar and wind power are the dominant renewable energy sources (RESs) nowadays, whose average levelised cost of electricity (LCOE) falls within the fossil fuel-fired cost range as USD. MPCs use modules in parallel connection to obtain the multi-port configurations, which reduce the volume due to the elimination of bulky transformers [18,19,20] They are mainly applied for the stand-alone systems such as electric vehicles (EVs) because galvanic isolation is preferred for the grid-tie systems for the safety reason. In this paper, based on the multi-module converter in [28], a novel bidirectional MPC is developed and adopted as the SM The desired advantages such as power stage integration, low voltage stress of semiconductor components, expandable output voltage and power remain. The paper is organised as follows: the basic cell is analysed in Section 2; the scalable topology design, operation and the fault tolerance strategy are discussed in Section 3; Section 4 presents the simulation results to verify the operation of the converter; Section 5 concludes the main points of this paper
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