Abstract
This paper explores the feasibility of multilevel dual-active bridge-inverter (DABMI) applications for grid-connected applications of a modern Model of Predictive Direct Power Control (MPDPC) based on the conservative power theory (CPT). In the case of unbalanced grid voltages, the objective of the study is to promote continued active and reactive energy in MPDPC without reducing efficiency such as transient response and current harmonics. The nature of the instantaneous p-q theory permits only one out of three control targets to be fulfilled. The proposed control approached directly regulates the instantaneous active and reactive power to achieve three particular control objectives namely sinusoidal and symmetrical grid current, cancelling twice of fundamental grid frequency reactive power ripples, and removing twice grid frequency active power ripple. The techniques of complicated Grid part sequence extraction are unnecessary and improved at no extra expense, as is the case with current MPDPC fault-tolerant approaches. The instantaneous power at the next sampling instant is predicted with the newly developed discrete-time model. Each possible switching state will then be evaluated in the cost function defined until the optimal state which lead to the minimum power errors is determined. In MATLAB/Simulink simulation, the proposed CPT-based MPDPC measures reliability and performance at balanced and unbalanced grid voltages then compared with the conventional and existing MPDPC The proposed method manages to achieve all of three control targets which generates sinusoidal grid currents and attenuates active and reactive power ripple of twice the grid frequency exactly at the same time without losing its critical efficiency including transient reaction and current harmonics.
Highlights
IntroductionEnergies 2020, 13, 2951 for grid-connected power electronic inverters for facing different unfavorable grid conditions
Taking into account the significance of incorporating intermittent renewable energy sources within the utility grid, comprehensive studies have been carried out [1] to develop a successful control systemEnergies 2020, 13, 2951; doi:10.3390/en13112951 www.mdpi.com/journal/energiesEnergies 2020, 13, 2951 for grid-connected power electronic inverters for facing different unfavorable grid conditions
A new MPC method that incorporates the conservative power theory (CPT) concept in Model of Predictive Direct Power Control (MPDPC) under balanced and unbalanced grid voltage conditions has been presented. It is different from majority [33] techniques that suggested MPDPC has been put forward without the need for a complex sequence extraction of grid constituents, like the pulse-width modulation (PWM) and the phase lock loop (PLL) approach
Summary
Energies 2020, 13, 2951 for grid-connected power electronic inverters for facing different unfavorable grid conditions. One of the common undesirable grid disturbances that are experienced in renewable energy systems is voltage unbalance. Grid-tied inverter vulnerability gives rise to unbalanced grid voltage issues, which has compelled the research to move in the direction of unchartered fields. There are bottlenecks in these controllers in accomplishing multiple control objectives, even though they have complex design with a cascaded configuration. Their dynamic response is low and requires a phase lock loop (PLL) to become synchronous with the power grid [5]. Altering Table-based direct power control [6,7] will decrease the outcome when non-linear hysteresis comparator has been used [8,9]
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