Coordinated Control Strategy of Microgrid Based on Photovoltaic-Battery-Supercapacitor

The micro grid can use renewable energy to generate electricity and alleviate the energy crisis. However, it also poses challenges to power grid stability due to its intermittence, volatility, and randomness. These challenges have led to power difficulties in maintaining a stable power supply. To address these challenges, DC transmission lines can be used to establish a micro-grid connecting micro-sources and systems of energy storage. DC micro-grids are a promising solution for improving power supply quality and reducing the impact on the main network. Aiming at the shortcomings of photovoltaic system, based on the advantages of energy storage unit-super-capacitor-photovoltaic power station, the "energy storage-super-capacitor-photovoltaic" micro grid system is constructed, and a control strategy based on DC bus voltage balance is proposed to realize the rapid response of battery-super-capacitor. On this basis, the microgrid is modeled by Simulink, and the proposed method is analyzed.