The Design of a New Double Loop Controller For Simultaneous Adjustment of Input and Output Voltages of Single-Phase Grid-Connected Inverter

Subject Areas : journal of Artificial Intelligence in Electrical Engineering

Parisa Alipour ¹ , Mehdi Salimi ²

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Received: 2016-02-22 Accepted : 2016-02-22 Published : 2016-12-01

Keywords: grid-connected inverters, LCL filter, double-loop control, state-space modeling,

Abstract :

Although LCL filters are used widely in the grid connected inverters to reduce high-orderharmonics, such a system increases system order and therefore sustainable design of closed-loopcontroller system will be complicated. Recently, the single-loop control strategy has beensuggested for L or LC filter based grid-connected inverters. However, the use of single-loopcontrol directly in LCL filter-based inverters may cause instability. In this paper, a new doubleloopcontrol strategy is presented which includes a voltage external loop and an internal loop offilter capacitor current. The external loop controls the input voltage of the grid-connectedinverter. The internal loop improves system stability margin and removes the resonance of LCLfilter. To obtain the transfer function of system, single-phase instantaneous power theory is used.The computer simulation has proved the feasibility of the proposed control

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