A control method of DC bus oscillation suppression based on duty cycle calculation is proposed in this paper
which is mainly composed of two parts: oscillation current control ring and duty cycle calculation ring
which can effectively extract the main frequency component of oscillation and calculate the required duty cycle
and has a better suppression effect. The small signal impedance analysis of the system shows that the contorl method can effectively reduce the resonant peak of the DC bus and effectively improve the stability of the system. Finally
experiments demonstrate that the method effectively suppresses bus voltage oscillations.
关键词
Keywords
references
ALSHAREEF M, LIN Z Y, LI F L, et al.A grid interface current control strategy for DC microgrids[J]. CES transactions on electrical machines and systems, 2021, 5(3): 249-256.
LU X N, SUN K, GUERRERO J M, et al.State-of-charge balance using adaptive droop control for distributed energy storage systems in DC microgrid applications[J]. IEEE transactions on industrial electronics, 2014, 61(6): 2804-2815.
HUDDY S R, SKUFCA J D.Amplitude death solutions for stabilization of DC microgrids with instantaneous constant-power loads[J]. IEEE transactions on power electronics, 2013, 28(1): 247-253.
DRIESEN J, KATIRAEI F.Design for distributed energy resources[J]. IEEE power and energy magazine, 2008, 6(3): 30-40.
ZHU J H, HU J B, LIN L, et al.High-frequency oscillation mechanism analysis and suppression method of VSC-HVDC[J]. IEEE transactions on power electronics, 2020, 35(9): 8892-8896.
NI F Y, LI Z M, WANG Q.The voltage control strategy of a DC-link bus integrated photovoltaic charging module in a unified power quality conditioner[J]. Energies, 2019, 12(10): 1842.
TIAN J, GAO X Z, SUN H Q, et al.Research on sliding mode control method of nonlinear DC micro-grid active power filter[C]//2021 IEEE 5th Conference on Energy Internet and Energy System Integration (EI2). Taiyuan, China, 2021: 826-830.
SUN J.Impedance-based stability criterion for grid-connected inverters[J]. IEEE transactions on power electronics, 2011, 26(11): 3075-3078.