A New Type of Voltage Regulator for Controlling Low Voltage Problems in Rural Areas

Voltage instability, serious harmonic pollution and instantaneous voltage drop are common problems in rural power grids, which seriously affect agricultural production and residential power quality. In order to solve these problems, this paper designs a low voltage regulator suitable for rural power grid. The regulator adopts the two-stage topology of the front voltage doubling Boost PFC and the back half bridge inverter, and realizes the fast dynamic response and high precision voltage regulation through the combination of voltage and current double closed-loop PI control (the front stage) and QPR control (the back stage). The experimental results show that the regulator can output 220V AC voltage stably in the wide input voltage range of 100V-265V, the dynamic response time is less than 30ms, the overshoot is less than 3%, the power factor is more than 99%, and the total harmonic distortion (THD) is less than 6%. The hardware prototype performs well in the actual test, and provides an efficient and reliable solution for the low voltage management of rural power grid.