Enhanced Power Control of Three-Phase Grid-Connected Inverters
This paper introduces an advanced approach to achieve real and reactive power control in grid-connected three-phase inverters under unbalanced grid conditions.
This paper proposes new analytical and optimal design procedures of the proportional-resonant (PR) controller and its harmonic compensators (HCs) for three-phase grid-connected voltage source inverters (VSIs) powered by renewable energy resources.
For the LCL three-phase grid-connected inverter, the gain of the PR controller can obtain infinite gain at fundamental frequency, thus realizing non-static error control of the fundamental component of the grid-connected current. However, due to load changes and various interferences, the actual power grid frequency will fluctuate.
For three-phase LCL grid-connected inverters, few studies consider the steady-state error of grid-connected current and the power grid frequency fluctuation at the same time, and relevant control technologies need further research. This paper studies the controller of the three-phase LCL grid-connected inverter in the α - β coordinate system.
The authors of proposed the applying of PR current controller with its 3 rd, 5 th and 7 th HCs for single-phase PV inverters collaborated with an LCL-filter. In this reference, the design procedure depends mainly on MATLAB's SISO Design Tool.
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