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Design of an Internal Model Control strategy for single-phase grid-connected PWM inverters and its performance
Eric N Chaves1, Ernane A A Coelho1, Henrique T M Carvalho1
1Universidade Federal de Uberlândia, Uberlândia, MG, Brazil.
Abstract:
This paper presents the design of a controller based on Internal Model Control (IMC) applied to a grid-connected single-phase PWM inverter. The mathematical modeling of the inverter and the LCL output filter, used to project the 1-DOF IMC controller, is presented and the decoupling of grid voltage by a Feedforward strategy is analyzed. A Proportional - Resonant Controller (P+Res) was used for the control of the same plant in the running of experimental results, thus moving towards the discussion of differences regarding IMC and P+Res performances, which arrived at the evaluation of the proposed control strategy. The results are presented for typical conditions, for weak-grid and for non-linear local load, in order to verify the behavior of the controller against such situations.
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