Asynchronous interconnection of a microgrid

Abstract

This paper shows how a back-to-back asynchronous interconnection can be used to turn part of the utility network into an advanced Smartgrid or Microgrid, which behaves like a model citizen as seen from the main network and offers uninterruptible supply functionality to its loads or microsources. Additionally energy storage can be integrated on to the DC link of the AC:DC:AC connection interface. The basic control of such a system is discussed and simulation results of its operation are presented.

10 kV SiC MOSFET Based Medium Voltage Power Conditioning System for Asynchronous Microgrids

“…The challenges include voltage and frequency control, especially with integrated RES [7][8], poor dynamic performances of mode transitions [9][10], complex stability consideration and protection strategies [11][12]. To mitigate these issues, a different microgrid concept was proposed, which is named asynchronous microgrid (ASMG) [13]. An ASMG connects to an ac distribution grid through a microgrid power conditioning system (PCS).…”

“…Previous publications on ASMG mainly focus on the demonstration of system-level benefits provided by system architecture. The ASMG network and potential application cases are discussed in [13]. In [14], an ASMG is proposed for New York City, and ASMG benefits are demonstrated through simulation, including disturbance decoupling, fault isolation, etc.…”

Microgrids dynamic stability interconnected through low voltage AC network

“…Use of power electronics has made it easier for asynchronous interconnection of microgrid through dc link and back to back convertor and also drawing power from WES/PVS [2]. The control and optimization of a hybrid ac/dc network are still an open problem [3]- [5].…”