Abstract
This paper presents an optimal control method for a compact reduced switch count AC/AC converter in an AC microgrid. The AC/AC converter is adopted to interconnect dual three-phase renewable energy sources (RESs) and a three-phase permanent magnet synchronous motor (PMSM) to the grid to form an example of a mixed grid-feeding-drive system. For the adopted converter, a generalized pulse width modulation (PWM) scheme employing the third harmonic injection and a control method are proposed. Moreover, to achieve reduced dc link voltage ripple, good reference tracking and disturbance rejection, the gains of the controllers are optimized by minimizing a weighted sum of different objective functions. Each objective function represents a specific aspect to be minimized and the optimization problem is solved employing particle swarm optimization (PSO) method, while ensuring that the total harmonic distortion (THD) of the current at the points of common coupling (PCC) are less than 5%. For this mixed grid-feeding-drive system, simulation results under fast transient are provided to demonstrate the applicability of the adopted converter in the AC microgrid, the effectiveness of the proposed PWM, and the proposed optimal control method.
Highlights
Nowadays, renewable energy sources (RESs) must play a major role in the world’s energy mix.Their increase is in line with global energy policy [1]
While ensuring that the total harmonic distortion at the points of common coupling (PCC) are less than 5% to avoid harmonic related issues, the gains of the controllers are optimized by minimizing a weighted sum of different objective functions
This paper presented an optimal control of a mixed-grid-feeding-electric-drive system utilizing compact AC/AC converter in an AC microgrid
Summary
Renewable energy sources (RESs) must play a major role in the world’s energy mix. Their increase is in line with global energy policy [1]. Their integration in the network put challenges to be faced in order to harness them effectively. Interconnecting the RESs to the microgrid requires a proper control and a management of the power flow. Various power management and control strategies employed in DC-coupled, AC-coupled, and AC-DC-coupled microgrids were overviewed in [3]. The overview was concluded with some recommendations highlighting the promising power management strategies in the future microgrids. Optimal design and control of such systems are of supreme importance and this is one objective of this paper
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