Abstract
This paper introduces a novel control scheme for the operation of multilevel inverters forming a microgrid. The core of the suggested control scheme is an advanced (power-rate) exponential sliding mode controller. This developed controller is robust toward any variation of the system’s parameters and loads in addition to its fast and accurate performance. The presented control scheme provides advantageous characteristics to the microgrid operation in an autonomous mode (microgrid mode) and grid-connected mode. In the microgrid mode, the voltages and frequency are stable at any variable balanced and unbalanced load. In the grid-connected mode, an effective procedure for connecting the microgrid to the main grid is proposed to guarantee a seamless and fast transition to the grid-connected mode. The performance of the presented control scheme along with its proposed controller is validated by comparing its results to another linear and non-linear controllers for the same microgrid loading conditions.
Highlights
This section covers the background and state-of-art for the control schemes used to operate the microgrid
This section shows the performance of the proposed control scheme along with the developed controller for the microgrid operation in different modes
Variable balanced loads in microgrid operation This section shows the performance of the developed control scheme for variable balanced loads, where the equivalent load per phase is the parallel combination between Zload1 = 55 + 18.84j and Zload2 = 65 + 31.4j for time from t=0 s to t=4 s
Summary
This section covers the background and state-of-art for the control schemes used to operate the microgrid. We present the pitfalls associated with existing schemes and it sheds light on the proposed control scheme for the microgrid. The microgrid becomes a new promising trend at medium and low voltage levels because it has several merits compared to the traditional central power grid [1]. The microgrid encompasses a group of loads with some distributed generators such as inverters and generators. The inverters are fed by distributed energy resources (DER), while the generators are driven by micro-turbines, wind-turbines, and combustion engines. The microgrid can generally be operated in an autonomous mode (microgrid mode) or a grid-connected mode. It has the capability to supply and/or absorb power from the distribution system (power grid) and the distributed generation systems (DGS)
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