Abstract
This paper presents a new and specific use of a bidirectional interleaved converter to perform a power interface in hybrid microgrids. The converter is responsible for regulating the power flow between the direct-current (DC) microgrid and the rest of the hybrid microgrid by controlling the DC microgrid voltage. The authors present a detailed modeling of the mentioned system in order to develop the system control design and a stability analysis. In addition, the authors propose a new control design strategy aiming at improving the voltage control disturbance rejection characteristic, while maintaining a good dynamic behavior regarding the reference tracking functionality. In this hybrid microgrid topology, a back-to-back converter connects the main grid to the AC microgrid. The main objective of this converter is to provide a high-power-quality voltage to critical and sensitive loads connected to the microgrid. The interleaved converter adjusts the DC microgrid voltage according to the operational voltage of the back-to-back converter DC link. In the DC microgrid case, the variation of load and generation connection could lead to serious voltage sag and oscillations that could be harmful to the sensitive loads. The voltage controller must be capable of rejecting these disturbances in order to maintain a high-power-quality voltage. Furthermore, experimental results are provided in order to validate this specific application of the interleaved converter and the presented control design strategy.
Highlights
Over the years, many different studies related to microgrids have been developed due to the high increase of the distributed generation penetration in the electrical systems [1,2,3,4,5,6], which is a consequence of the advances that have been occurring with the solar and wind generation systems and with power electronics technology
The mentioned back-to-back converter acts as a power interface between the main grid and the AC microgrid. This topology may require the use of an additional DC–DC converter in order to perform a power interface between the back-to-back converter DC link and the DC microgrid while maintaining its voltage regulated in the desired level, which may be different from the back-to-back converter DC-link voltage
There are loads and distributed generation (DG) sources in both AC and DC microgrids in such a way that a bidirectional power flow occurs between the AC microgrid and the main grid, and between the DC microgrid and the rest of the hybrid microgrid
Summary
Many different studies related to microgrids have been developed due to the high increase of the distributed generation penetration in the electrical systems [1,2,3,4,5,6], which is a consequence of the advances that have been occurring with the solar and wind generation systems and with power electronics technology. The interleaved converter has been used in many different applications that require a regulated power source with high reliability and low weight Most of these applications are related to energy storage systems and electric vehicles [20,21,22,23,24,25,26,27,28,29,30,31]. A new method for tuning the voltage controller parameters, in order to obtain a fast disturbance rejection characteristic, is proposed aiming at maintaining a high-power quality microgrid voltage. This paper presents experimental results that validate the proposed interleaved converter application
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