Control Method of Three-Phase Grid-Tied Inverters Based on V/f Control of PM Motors

Abstract

The paper presents a control method for three-phase grid-tied inverters based on V/f control. V/f control is used to control the speed of permanent magnet synchronous motors (PMSMs). However, speed control cannot be achieved with the grid-tied operation because the grid-tied inverter cannot control the power grid frequency. The proposed method establishes the relationship between an output power command, output power, and output frequency for V/f control, thereby functioning as a speed controller. Thus, the proposed method achieves supped control during grid-tied operation using V/f control. Moreover, the control response of the proposed method is analyzed to design the control parameters. The experimental results are demonstrated using a 2-kW inverter.