September 2022
Intermediate
416 pages
11h 39m
English
Content preview from Smart Hybrid AC/DC Microgrids
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10Harmonic Compensation Control in Smart Hybrid Microgrids
10.1 Introduction
In both DC and AC subgrids of a hybrid microgrid system, the presence of non‐linear loads and switching mode power converters make harmonic pollution a significant concern. These harmonics, particularly the low‐order harmonics, can cause extra loss, interference in the grid‐connected apparatus, and even resonance in the microgrid. To mitigate the harmful harmonics, as discussed in Chapter 7, both passive power filters (PPFs) and active power filters (APFs) can be used to provide low‐impedance paths for harmonics, improving the power quality of the other nodes in the microgrid. However, installing dedicated filters (passive or active) requires extra cost, and these centralized compensation solutions may not be that effective since the sources of harmonics are widely distributed in today's distribution systems.
Thanks to the development of smart interfacing converter (IFC) control strategies, harmonic compensation has been added as an ancillary function to both DC/AC and DC/DC IFCs, including distributed generations, energy storage, and loads, as well as interlinking converters of microgrids. Thus, the harmonics can be mitigated in both AC and DC subgrids in a distributed manner without extra cost.
In this chapter, the harmonics compensations based on the external virtual impedance concept in power systems are studied first. Then, control strategies of low‐switching‐frequency interfacing power electronics ...
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