Microgrid energy storage system and energy management method thereof

Abstract

The invention relates to a microgrid energy storage system and an energy management method thereof. The system comprises a photovoltaic module, an energy storage unit, a three-phase energy storage inverter, a photovoltaic grid-connected inverter and a power generator and can be used for achieving an energy management function, wherein a core controller of the three-phase energy storage inverter is a master control unit, the photovoltaic inverter and the power generator are slave control units, the master control unit manages the running conditions of other slave control units according to a power grid condition, load power, battery electric quantity, photovoltaic output and the like, the energy dispatching of the whole system is completed, the charging and the discharging of the battery are achieved according to load change and power adjustment of a grid-connected point during grid connection, the energy storage inverter is taken as a voltage source to provide a condition for grid connection of the photovoltaic inverter, supply power to a local load and charge and discharge the battery during off network, meanwhile, power generator working is switched to ensure no power off of the load when the energy of the system is not enough, and intelligent energy management of the whole system and smooth output of network-side power are truly achieved.

Description

technical field [0001] The present application relates to the technical field of electric power systems, in particular to a microgrid energy storage system in the field of photovoltaic power generation and an energy management method thereof. Background technique [0002] Global energy is in short supply, and the development of emerging energy industries is imperative. However, traditional wind energy, solar energy and other clean energy power generation are greatly affected by the environment, resulting in unstable output power, which makes the traditional power grid unable to fully carry, resulting in a large amount of energy being wasted, and other The operating conditions are restricted by the power grid and cannot meet applications such as remote mountainous areas and islands without power grids. [0003] Microgrid is a relatively new concept in the field of power systems. It consists of distributed generators, new energy power generation, loads, energy storage systems ...

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Problems solved by technology

[0004] However, the output of the new energy power generation system in the microgrid is relatively difficult to predict, the network changes of the operation mode switching, and the face of different demand loads and other factors all put forward higher requirements for the energy management of the microgrid system

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