Research On Power Control Technology Of Light Storage Micro - Grid System

With global energy and environmental issues increasingly severe.Renewable energy becomes one of important ways that could relieve above-mentioned issues.Distributed generation and micro-grid are important ways of renewable energy application. Among the many forms of DG, distributed photovoltaic generation(DPVG) gets the attention of power grid agency worldwide because of its advantages such as Non-polluting, renewable, low-cost, more flexible, easier to maintain, modular integration, capacity can be very flexible, easy expansion, quick installation,combined with the construction to constitute building integrated photovoltaics(BIPV),at the same time, plays an positive role in improving power supply reliability and power quality. However, affected by changes in solar irradiance and weather conditions, DPVG has a strong randomness,volatility and intermittent. And with the increasing scale of DPVG, above-mentioned randomness,volatility and intermittent is bound to cause impact on the safe and stable operation of power grid.Therefore, in order to use distributed photovoltaic generation more effectively, improve power supply reliability and improve power quality, This paper takes the form of optical storage micro-grid to make DPVG more friendly insert power grid on a large scale. Micro-grid system consists of distributed photovoltaic power, energy storage and local load.In this paper,has a study on the establishment of solar array&battery storage micro-grid system and power control of DPVG.This distributed solar array&battery storage micro-grid system control strategy is bases on three-phase grid-connected PV systems, which includes modeling of three-phase grid-connected PV systems,maximum power point tracking(MPPT) methods for PV arrays, grid-connected control of two-stage PV system and energy storage charging and discharging. So distributed solar array&battery storage micro-grid, not only can give full play to the resource of photovoltaic power generation, environmental advantages, also can effectively overcome the random fluctuation characteristics of photovoltaic power generation, reducing its impact on power grid;characteristics of reactive power compensation of PV generation is to make sure PV system operating more economically and reliably, which not only realizes unitive control of PV grid-connected generation and reactive power compensation, and also make PV system has a certain ability of LVRT.