An energy management method for an intelligent microgrid

Abstract

The invention provides an energy management method of an intelligent microgrid. The method comprises the following steps of acquiring Internet power Pdgrid, Internet power threshold value Pdth and output power Pp of a photovoltaic cell of the intelligent microgrid in real time; if Pp is equal to 0, removing all photovoltaic cells in the intelligent micorgrid, and revising output power PE of an energy storing device; and if Pp is larger than 0, removing and inputting the photovoltaic cells according to a working condition of the energy storing device. Compared with the prior art, according to the energy management method of the intelligent microgrid, power of a call wire is compensated through the energy storing device, the problem of reverse-power is avoided, and effective monitoring on the intelligent microgrid can be realized under the conditions of environment mutation, and immediate reaction not allowed at hardware environment.

Description

technical field [0001] The invention relates to an energy management method for an intelligent microgrid, in particular to an energy management method for an intelligent microgrid including photovoltaics, lithium batteries and supercapacitors. Background technique [0002] Smart microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads, monitoring and protection devices. It is an autonomous system capable of self-control, protection and management. It can run in parallel with the external power grid or in isolation. From a micro perspective, a microgrid can be regarded as a small power system, which has complete power generation, transmission and distribution functions, and can achieve local power balance and energy optimization. The essential difference between it and a distributed power generation system with loads is that It has grid-connected and independen...

AI Technical Summary

Problems solved by technology

[0003] In the smart microgrid based on photovoltaics, energy storage devices and ungraded loads, the output power of photovoltaic power generation units is intermittent and random, and the load changes are also random, which has a negative impact on the stable operation of the smart microgrid.

At the same time, energy storage devices, especially large-capacity electric energy storage devices, often need to absorb or release large power frequently. For example, batteries, which are commonly used as energy storage devices, will experience temperature rises during frequent high-power charge-discharge and deep discharge processes. , The active material on the positive and negative plates falls off and other phenomena, resulting in the cumulative loss of battery capacity, and a rapid decline in a short period of time, which seriously affects the service life of the battery and the normal and stable operation of the smart microgrid.

Therefore, it is necessary to perform energy management on distributed power sources, energy storage devices, and loads in the smart microgrid. In the prior art, scene simulation is mainly used to formulate the energy management method of the smart microgrid. However, due to the communication time of the on-site hardware, Inability to quickly respond to control commands and the impact of changing weather and rapid load changes, resulting in a large difference from the actual situation on site and reducing the effect of energy management. Therefore, it is necessary to provide an energy storage device that can avoid excessive discharge. A management method that can respond to smart grid control commands in a timely manner is particularly important.

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