Abstract
Stand-alone power systems based on renewable energy sources are used to replace generators based on fossil fuels. Those renewable power systems also require Energy Storage Devices (ESD) interfaced by a charger/discharger power converter, which consist of a bidirectional DC/DC converter, and a DC bus. This paper proposes a single sliding-mode controller (SMC) for the charger/discharger DC/DC converter to provide a stable DC bus voltage in any operation condition: charging or discharging the ESD, or even without any power exchange between the ESD and the DC bus. Due to the non-linear nature of the power converter, the SMC parameters are adapted on-line to ensure global stability in any operation condition. Such stability of the adaptive SMC is mathematically demonstrated using analytical expressions for the transversality, reachability and equivalent control conditions. Moreover, a design procedure for the adaptive SMC parameters is provided in order to ensure the dynamic response required for the correct operation of the load. Finally, simulations and experimental tests validate the proposed controller and design procedure.
Highlights
The growth of the world economy has increased the demand for electric power, which has led to the decrease of fossil fuels and increased CO2 emissions
This section illustrates the design of the sliding-mode controller for the charger/discharger using the following parameters and conditions:
This paper has presented a control strategy, based on the sliding-mode theory, to regulate a bidirectional DC/DC converter interfacing an Energy Storage Devices (ESD) and a DC bus in a renewable power system
Summary
The growth of the world economy has increased the demand for electric power, which has led to the decrease of fossil fuels and increased CO2 emissions. This situation has been addressed by governments, research centers, industry and energy supply companies by using renewable sources [1,2,3,4,5,6,7,8]. The introduction of renewable energy sources presents major challenges in political, social and technology sectors. The technological level presents many challenges: on the one hand, it is required to improve the conversion device, namely, more efficient, economical and reliable the photovoltaic panels or fuel cells [14,15,16,17]; on the other hand, it is required to improve the strategies for maximizing the energy production [18,19,20], improve the power quality [21,22,23] and fulfill some non-functional requirements as reliability, scalability, size, cost, etc. [24,25,26]
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