| Abstract [eng] |
This paper examines the potential for voltage regulation using a grid-connected solar inverter and its power management functions. Although many modern inverters have voltage regulation functions, they are often implemented without taking into account the electrical characteristics of the connected grid. However, the efficiency of voltage regulation depends heavily on the characteristics of the grid impedances, especially the ratio of inductive to reactive components. In low-voltage grids, this ratio is usually low, which reduces the compensation efficiency, while in higher-voltage grids, the conditions for voltage regulation are more favorable. A 10 kW SolarEdge solar inverter connected to photovoltaic panels was used experimentally to study these effects. The grid voltage was varied using a 20 A autotransformer, which allowed for precise regulation of the grid voltage from 0 V to 450 V. This configuration allowed for the simulation of both voltage sags and overvoltages, which allowed for the analysis of the inverter’s ability to respond to such disturbances. The study was conducted in two stages. In the first stage, the short-term and long-term operating voltage limits of the converter were determined by applying various voltage levels without additional components. In the second stage, external three-phase inductors of different inductance values were introduced into the system to evaluate how the inductive load affects the voltage compensation behavior of the converter. All measurement data were recorded using a Metrel MI 2895 power quality analyzer. |
