TY - JOUR
T1 - Analysis of Washout Filter-Based Power Sharing Strategy - An Equivalent Secondary Controller for Islanded Microgrid without LBC Lines
AU - Han, Yang
AU - Li, Hong
AU - Xu, Lin
AU - Zhao, Xin
AU - Guerrero, Josep M.
PY - 2018/9
Y1 - 2018/9
N2 - As a supplement of the droop control, the concept of secondary controlled microgrid (MG) has been extensively studied for voltage and frequency restoration. However, the low band-width communication (LBC) channels are needed to exchange information between the primary and secondary controllers, and the performance of the secondary controller degrades due to the uncertain communication delay and data drop-out in the LBC lines. Recently, a washout filter-based power sharing method was presented without communication lines and additional control loops. In this paper, the equivalence between secondary control and washout filter-based power sharing strategy for islanded microgrid is demonstrated, and the generalized washout filter control scheme has been obtained. Additionally, the physical meaning of control parameters of secondary controllers is also presented. Besides, a complete small-signal model of the generalized washout filter-based control method for islanded MG system is built, which can be utilized to design the control parameters and analyze the stability of MG system. Finally, extensive simulation and experimental results are provided to confirm the validity and effectiveness of the derived equivalent control scheme for islanded MG.
AB - As a supplement of the droop control, the concept of secondary controlled microgrid (MG) has been extensively studied for voltage and frequency restoration. However, the low band-width communication (LBC) channels are needed to exchange information between the primary and secondary controllers, and the performance of the secondary controller degrades due to the uncertain communication delay and data drop-out in the LBC lines. Recently, a washout filter-based power sharing method was presented without communication lines and additional control loops. In this paper, the equivalence between secondary control and washout filter-based power sharing strategy for islanded microgrid is demonstrated, and the generalized washout filter control scheme has been obtained. Additionally, the physical meaning of control parameters of secondary controllers is also presented. Besides, a complete small-signal model of the generalized washout filter-based control method for islanded MG system is built, which can be utilized to design the control parameters and analyze the stability of MG system. Finally, extensive simulation and experimental results are provided to confirm the validity and effectiveness of the derived equivalent control scheme for islanded MG.
KW - Microgrid
KW - Droop control
KW - Washout filter
KW - Communication delay
KW - Small -signal model
KW - Secondary control
KW - Band-pass filter (BPF)
KW - Hardware-in-the-loop (HIL)
UR - http://www.scopus.com/inward/record.url?scp=85050140803&partnerID=8YFLogxK
U2 - 10.1109/TSG.2017.2647958
DO - 10.1109/TSG.2017.2647958
M3 - Journal article
SN - 1949-3053
VL - 9
SP - 4061
EP - 4076
JO - I E E E Transactions on Smart Grid
JF - I E E E Transactions on Smart Grid
IS - 5
M1 - 7809173
ER -