Three-phase converter unit for combined power supply systems of local objects with photovoltaic solar battery.
Journal Title: Наукові праці Донецького Національного Технічного Університету серія: Електротехніка і Енергетика - Year 2017, Vol 1, Issue 1
Abstract
Combined power supply systems for local objects with a photovoltaic solar battery have a connection to AC grid. At a power of more than 10 kW, the converter unit is three-phase and is used only in the daytime. Increasing the efficiency of using the unit is achieved when it combines the function of a power active filter, which will ensure a close to unity power factor at the point of connection to the grid with a 24-hour application. It should also provide an autonomous mode of operation when disconnected from the grid. The load of the local object is asymmetrical and nonlinear. In this case, the converter must have a neutral wire and provide independent formation of currents in the output phases. The goal of the work is to improve the principles of realizations a three-phase converter using the three-level topology of the inverter and combining the function of the active filter when working in parallel with the network, and also the operation in the au-tonomous mode. The use of a three-level grid inverter with two solar array units is considered when connecting their common output to the inverter's zero output and the neutral AC power line. It is justified to determination of the parame-ters of the power circuits of the inverter with the function of a power active filter when single -phase or three-phase rectifiers with a capacitive filter are used in the load. The expediency of using the step -up DC-DC voltage converters at the input of the grid inverter is shown, which makes it possible to complete the solar battery of the required power taking into account the change in its voltage as a function of temperature. The structure of the control system of the unit is designed to ensure that it combines the function of the active filter when the converter is operating in parallel with the grid with independent current generation in the output phases, with the symmetry of the currents in the phases of the grid and the operation in the autonomous mode. The effectiveness of the proposed solutions is confirmed by the results of modeling the system "network - converter with a solar battery - load". The received solutions are the basis for the design of three-phase converters of combined power supply systems with the function of active filter at round -the-clock use.
Authors and Affiliations
A. А. SHAVELKIN, A. YU. RADETSKIY
Keywords
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