Research On Micro Grid Voltage Sag Compensation By Super Capacitor Energy Storage Typed APF

Throughout the world energy over a hundred years of development, the contradiction between energy supply and demand forces people to the same degree of concern for green energy ecological environment gradually. Microgrid can be integrated photovoltaic,biomass power generation, wind power and other renewable energy generation units,it can save investment, reduce energy consumption,improve energy efficiency, to meet the growing demand for electricity. However, new energy generation micro-grid random and intermittent example: instantaneous power failure, voltage sags and other power quality problems caused great impact on the stable operatiom of the micro-grid. And also on the micro-grid power system and power generation to develop a more stringent power quality standards. In this form, aiming at micro-grid voltage sag power quality problems are analyzed in order to improve the proposed super capacitor energy storage element as an active power filter (APF),to achieve a multi-functional requirements, integrated micro grid quality improvement.Super capacitor energy storage APF has two modes:normal operation when the microgrid,its work in harmonic suppression mode for harmonic suppression microgrid; in microgrid voltage sag occurs, its working voltage compensation mode to compensate for micro-grid voltage sags. Depending on the cause of the micro-grid voltage sags, classification compensation:For internal reasons voltage power grid caused by the micro-dips, voltage smaller decline, the use of super capacitor energy storage to compensate APF alone; for reasons caused by the distribution network side the voltage sag, using super capacitor enegy storage APF and series inverter micro-grid voltage sag compensation.By Matlab/Simulink simulation to verify the feasibility of the methods used. The method proposed in the paper to run flexible and effective against micro-grid voltage sag to compensate, effectively limiting the distribution network voltage sag occurs when the fault current distribution network between the microgrid and contact line,have a certain practical significance and practical engineering application.