The converter unit with function of voltage stabilization for a combined power supply system with renewable power sources.
Journal Title: Наукові праці Донецького Національного Технічного Університету серія: Електротехніка і Енергетика - Year 2017, Vol 1, Issue 1
Abstract
Combined power supply systems with renewable energy sources are used for local facilities in order to ensure stable power supply by using existing overloaded networks remote from transformer substations that are charac-terized by voltage deviations exceeding permissible values. In these conditions, stabilization of the consumers' voltage is required. Modern grid inverters work only with the generation of energy by a renewable source, they can be used for a voltage in the grid of 180 ÷ 264 V, which is not enough, and the efficiency of their use will vary. The solution to the stabilization problem is achieved by using additional rather expensive voltage regulators. An important problem is the feasibility of generating energy into the grid, when the voltage in it exceeds the permissible value. This determined the purpose of the work: the creation of a multifunctional converter with an integrated function of stabilizing the load voltage and increasing the efficiency of using the device in conditions of changing the mains voltage. There is proposed a structure with integrated booster transformer and inverter, to reduce their power, voltage stabilization is carried out only if its value falls outside the permissible limits, if the permissible voltage value is exceeded, the generation of energy into the grid is excluded or the unit switches to autonomous operation. To reduce the energy losses in the switches, the voltage in the DC link of the grid inverter is adjusted in accordance with the mains voltage. There are developed: the structure of the con-verter control system with providing a power factor close to unity when working with the network and providing work in an autonomous mode; it is justified to determine the parameters of the circuit, taking into account the function of the active filter and the change in the mains voltage; computer model of the syste m "converter with a solar battery, grid and load". The solutions obtained are the basis for the design of single -phase converters of combined power supply systems with the combination of active filter functions and load voltage stabilization at round-the-clock use.
Authors and Affiliations
A. А. SHAVELKIN
Keywords
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