Microgrid real-time energy optimizing and scheduling method in parallel running mode

Abstract

The invention discloses a microgrid real-time energy optimizing and scheduling method in a parallel running mode. The method comprises the following steps of: firstly, dividing 24 hours in a day into a peak period of time, a general period of time and a trough period of time according to the load condition of a large power grid; and then, monitoring the working state of an accumulator in a microgrid in real time in the real-time process of the microgrid and adopting different energy optimizing strategies according to different periods of time and different working states of the accumulator soas to confirm the active power output of various schedulable micro power supplies, the charging and discharging power of the accumulator and scheduling instructions of the active power interactive with the power grid and the passive power of a passive adjustable power supply in the microgrid. The microgrid suitable for the invention comprises a reproducible energy generator, the schedulable micropower supplies and the accumulator. The invention not only can improve the economy and the reliability of the microgrid, but also can help the great power grid to cut peaks and fill troughs and is favorable to prolonging the service life of the accumulator.

Description

technical field [0001] The invention relates to planning, operation and management of a micro-grid, in particular to a real-time energy optimization scheduling method for a micro-grid in a grid-connected operation mode. Background technique [0002] A microgrid is a collection of various distributed power sources, energy storage units, loads, and control and protection systems. Through the coordination and cooperation of related control devices, it provides high reliability and high-quality power for loads. Due to its environmental friendliness and low construction cost, the microgrid has become a useful supplement to the large power grid, and has received more and more attention and research. On the basis of ensuring the safe and stable operation of the microgrid, the economically optimized operation of the microgrid is an important content in the research of energy management. [0003] At present, some researches have been done on micro-grid energy optimization scheduling...

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Problems solved by technology

[0003] At present, some researches have been done on micro-grid energy optimization scheduling at home and abroad. In the literature [1]-[5], the energy optimization model is mainly established from the aspects of the lowest operating cost and the best environmental benefits of the micro-grid, and the results are solved by the optimization model. The active power of each schedulable micro-power source is dispatched, but the reactive power output is not optimized, and the network structure of the micro-grid itself is not considered, so that the optimization results are not realistic. In addition, the use of batteries in the micro-grid is only Unfounded cyclic charging and discharging, and not optimizing the charging and discharging of the battery, thus not making full use of the battery to improve the economy of the microgrid operation

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