A Control Strategy Design Applied To Single-Phase Grid-Connected Inverters

Abstract

This paper presents the design of the One-Degree of Freedom Internal Model Control structure (1-DOF IMC) applied to a single-phase grid-connected inverter. It is presented the mathematical model of the inverter and its LCL filter, used to project the 1-DOF IMC controller, and it is analyzed the internal feedback compensation corresponding to the decoupling of grid voltage provided by a feedforward strategy. In order to establish a comparison base, the grid connected system is also evaluated using a Proportional-Resonant Controller (P-Res). Simulations results of both controllers are presented, which allows the comparison between the 1-DOF IMC and P-Res control performances.

Symmetrical Pole Placement Method-Based Unity Proportional Gain Resonant and Gain Scheduled Proportional (PR-P) Controller With Harmonic Compensator for Single Phase Grid-Connected PV Inverters

“…( ) =̂̂= 800 0.001 (21) Magnitude and phase response of the loop transfer function that is ( ) times ( ) with varying…”

“…Evaluating the performance of the single-phase GCI controller systems that is supplied with PV array DC under varying environmental conditions with the use of real PV panels in series or parallel according to the needs is practically impossible due to the lack of control over the irradiance and temperature and the requirement of large area, hence the use of PVEs has become compulsory [13], [14], [15]. A wide range of research papers have discussed the various controllers thoroughly by using conventional or advanced design techniques for the singlephase GCI systems [16], [17], [18], [19], [20], [21], [22].…”