Microgrid Building Blocks for Dynamic Decoupling and Black Start Applications

TL;DR

This paper investigates the use of Back-to-Back converters as a key technology for enhancing microgrid stability, decoupling, and support during grid interactions, using a comprehensive phasor-domain model in simulations.

Contribution

It introduces a versatile microgrid building block based on BTB converters, demonstrating its application in dynamic decoupling and support within a simulated microgrid network.

Findings

BTB converters enable effective dynamic decoupling of microgrids.

The phasor-domain model efficiently simulates microgrid interactions.

Simulations show improved stability and support capabilities.

Abstract

Microgrids offer increased self-reliance and resilience at the grid's edge. They promote a significant transition to decentralized and renewable energy production by optimizing the utilization of local renewable sources. However, to maintain stable operations under all conditions and harness microgrids' full economic and technological potential, it is essential to integrate with the bulk grid and neighboring microgrids seamlessly. In this paper, we explore the capabilities of Back-to-Back (BTB) converters as a pivotal technology for interfacing microgrids, hybrid AC/DC grids, and bulk grids, by leveraging a comprehensive phasor-domain model integrated into GridLAB-D. The phasor-domain model is computationally efficient for simulating BTB with bulk grids and networked microgrids. We showcase the versatility of BTB converters (an integrated Microgrid Building Block) by configuring a two-microgrid network from a modified IEEE 13-node distribution system. These microgrids are equipped with diesel generators, photovoltaic units, and Battery Energy Storage Systems (BESS). The simulation studies are focused on use cases demonstrating dynamic decoupling and controlled support that a microgrid can provide via a BTB converter.