DC Thermoelectric composite grid system with DC nanogrid and its operation method

摘要

The present invention relates to a thermoelectric composite grid system to which a DC nanogrid is applied and which can provide an index and an operating environment from an integrated point of view for different energy (thermal energy and electric energy), a real-time control for operating facilities (a combined heat and power (CHP), a fuel cell (FC), an energy storage system (ESS), an air conditioner, a light, and the like), and various operating modes in terms of efficiency and economy through application of a demand prediction algorithm. According to the present invention, the system comprises: a distributed power source (100) including a thermal energy production device (110) and an electric energy production device (120); an energy storage system (200) including a thermal energy storage device (210) and an electric energy storage device (220); an energy management system (300) selecting and operating one among a plurality of operating modes differently controlling the distributed power source (100), the energy storage system (200), and a grid power source (500) in consideration of energy use pattern information of a thermal energy use load (410) and an electric energy use load (420), state information of the distributed power supply (100), the thermal energy storage device (210) and the electric energy storage device (220), price information of the grid power source (500), and power generation cost information of the thermal energy production device (110); and a DC nanogrid including a DC load (720) receiving one among DC of a DC production device (710), AC of the grid power source (500), and power of the distributed power source (100), and a battery (730) charging surplus DC power of the DC production device (710).