Output Impedance Modeling and High-Frequency Impedance Shaping Method for Distributed Bidirectional DC–DC Converters in DC Microgrids

Zhang, Qi; Li, Jiangjiang; Zhu, Rongwu; Deng, Fujin; Sun, Xiaodong; An, Shaoliang; Liserre, Marco

doi:10.1109/tpel.2019.2953813

Cited by 19 publications

(5 citation statements)

References 25 publications

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“…The delay may deteriorate the bandwidth of current control loop and stability margin of the system may decrease. To address this issue, a high frequency based virtual impedance based method is suggested in [26]. The suggested method improves band width of current control loop and stability margin of voltage control loop.…”

Section: Figure 1 Schematic Of Low Power DC Systemmentioning

confidence: 99%

“…The suggested method improves band width of current control loop and stability margin of voltage control loop. However, the implementation of suggested virtual impedance method discussed in [26] requires additional current sensors. To keep the performance of the source converter intact, active damping techniques are used to modify input impedance of CPL in [27][28][29].…”

Section: Figure 1 Schematic Of Low Power DC Systemmentioning

confidence: 99%

“…To compensate for the destabilizing effect of CPL, impedance compensation techniques are used [20][21][22][23][24][25][26][27][28][29]. These techniques modify or reshape the equivalent output impedance of source or input impedance of CPL converters to meet the stability criteria.…”

Section: Introductionmentioning

confidence: 99%

“…This increases damp-ing, but may increase error in power-sharing among different sources and deterioration of voltage regulation. To enhance the current sharing performance and stability margin of dc system, frequency dependent virtual impedance methods are suggested in [24][25][26]. In [24], a first order low pass filter is introduced in droop controller.…”

Section: Introductionmentioning

confidence: 99%

“…During steady state, the virtual R-L branch offers negligible impedance which improves the voltages regulation of sources. It is observed in [26] that the effect of delay caused due to digital control, sampling and switching operation in current control loop of source converters may deteriorate the bandwidth of current control loop and stability margin of the system may decrease. While evaluating the performance of virtual impedance methods discussed in [24,25], the effect of delay is not considered.…”

Section: Introductionmentioning

confidence: 99%

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Selection of capacitance for stable operation of low power DC system with constant power loads

Islam

Anand

et al. 2020

IET Generation Trans & Dist

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The connection of constant power loads (CPL) in a low power dc system leads to a reduction in the stability margin of the system. Most of the existing techniques increase the stability margin by modifying the controller for CPL or source converter at the cost of deterioration in the performance of converters. Few publications have suggested methods to determine the value of dc‐link capacitance required for stable operation of dc microgrid with CPL. These methods do not necessarily give the minimum possible capacitance as a solution. This paper suggests a method to determine the lower bound on the value of capacitor, for stable operation of dc system. A dc system with both linear and CPL loads is considered. Detailed mathematical analysis is used to determine the range of capacitance to ensure the stability of equilibrium point. Further, this paper discusses the effects of variation in linear loads on the selection of capacitor. The procedure of capacitor selection for a low power dc system is included. Using the real‐time digital simulator and a digital signal processor, controller hardware‐in‐loop based validation is carried out for the proposed approach.

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Section: Figure 1 Schematic Of Low Power DC Systemmentioning

confidence: 99%