Power electronic transformer-based alternating current/direct current microgrid coordinated control method

Abstract

The invention provides a power electronic transformer-based alternating current / direct current microgrid coordinated control method. The power electronic transformer-based alternating current / direct current microgrid coordinated control method includes the following steps that: 1, the real-time operation data of a microgrid are collected, and the predicted power curves of the distributed energy and load of the microgrid are established; 2, a distributed energy output power average value and a load demand power average value during a current scheduling period are calculated, so that the energystorage state-of-charge expected value of the microgrid can be obtained; 3, the operation state types of the microgrid are divided; and 4, a power electronic transformer controls the flow direction and magnitude of the power of the alternating current / direct current microgrid according to the operation state types of the microgrid. With the power electronic transformer-based alternating current / direct current microgrid coordinated control method adopted, the maximum consumption of distributed energy can be realized, the service life of an energy storage battery can be improved, and the numberof the times of the power feedback of the microgrid to a distribution network and power loss generated during the power feedback can be decreased.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to an AC / DC microgrid coordination control method based on power electronic transformers. Background technique [0002] The utilization of large-scale distributed energy resources (Distributed Energy Resources, DER) is of great significance to the protection of the environment, adjustment of energy structure and power consumption in remote areas. DER is affected by time and space factors and the power fluctuates greatly. Energy storage technology is an effective smoothing measure for this intermittent fluctuation. The microgrid composed of sources, loads, and storages is a strong support for the stable operation of the power grid. [0003] The existing micro-grid is mainly based on AC. With the rapid development and wide application of DC power sources and loads such as photovoltaics, energy storage, and electric vehicles, the DC power distribution form used in data center pow...

AI Technical Summary

Problems solved by technology

[0005] The existing definition of the operating state of the microgrid only starts from the perspective of distributed energy output and load, and fails to consider the impact of energy storage on the state of the microgrid. Therefore, the state of the microgrid is greatly affected by the output of distributed energy and load fluctuations. frequent changes

In the power control of the existing power electronic transformer to the AC and DC microgrid, the power between the AC microgrid and the DC microgrid cannot be transmitted to each other, and the control amount is complex and the target is not clear

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