A self-switched virtual impedance based stabilization method for a droop controlled DC microgrid with Constant Power Loads and input load filters

Hussain, Mosaddique Nawaz; Mishra, Rahul; Agarwal, Vivek

doi:10.1109/pedes.2016.7914287

Cited by 8 publications

(6 citation statements)

References 13 publications

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“…When passive damping method is applied, the formula of output impedance is modified by the added passive elements. As shown in Figure 5a, when RC parallel damping is applied, the output impedance changed such as in Equation ( 13); when RL parallel damping is applied as shown in Figure 5b, the output impedance is changed such as in Equation ( 14); and when RL series damping is applied as in Figure 5c, the output impedance is changed as shown in Equation (15).…”

Section: Damping Methodsmentioning

confidence: 99%

“…Based on the results analyzed in this paper, if the passive damping method is applied to pre-installed microgrid power converters, it is possible to ensure the stability of the entire system according to the increase in the load and the facilities. In addition, if the active damping method described in the previous studies [12,15,16] is applied to newly installed power converters, a synergy effect in terms of securing stability can be achieved and loss problem will also be alleviated.…”

Section: Simulation Analysismentioning

confidence: 99%

“…Several studies have been conducted to solve the system stability problem caused by the unexpected impedance overlap between converters, and there are active and passive methods [15][16][17][18]. The active method secures stability by adding only a controller to the conventional circuit without any auxiliary circuits or device additions on power flow [15,16]. This method has the advantage of no power loss, and it can simply correct the damping effect.…”

Section: Introductionmentioning

confidence: 99%

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A Stability Improvement Method of DC Microgrid System Using Passive Damping and Proportional-Resonance (PR) Control

Lee

Choi

2021

Sustainability

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Sustainable energy, such as sunlight and wind energy, that comes from sources that do not need to be replenished has become important. Accordingly, the importance of the design and stable management of DC microgrids is also increasing. From this point of view, this paper analyzes the interaction between source and load converters constituting the DC microgrid using the derived mathematical input and output impedances models. This paper proposes a stability improvement method using the analyzed result. The method focuses on the presence or absence of input and output impedance overlap using Middlebrook’s stability criteria. To verify validity of the proposed method, a case study with three damping methods is conducted: (1) RC parallel damping with PR controller, (2) RL parallel damping with PR controller, and (3) RL series damping with PR controller. Additionally, the frequency domain characteristics and the Nyquist stability are analyzed using MATLAB, and simulation verification is conducted using PSIM. Through the analysis and simulation results, we confirm that the stability of the DC microgrid can be improved by applying the proposed method. The passive damping method analyzed in this paper is applied to an installed power converter, where it is possible to ensure the stability of the DC microgrid.

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Section: Damping Methodsmentioning

confidence: 99%

Section: Simulation Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Stability Improvement Method of DC Microgrid System Using Passive Damping and Proportional-Resonance (PR) Control

Lee

Choi

2021

Sustainability

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“…Thus, it can meet Middlebrook's stability criterion and stabilize the system. VI is expressed as (23…”

Section: Stability Enhancement Control Schemementioning

confidence: 99%

“…Therefore, the VI control algorithm for reducing the LC resonance is applied to prevent the deterioration of system stability. In [20] and [23], interaction among the converters is reduced by applying VI control algorithm to the part where LC resonance frequency occurs and reinforcing insufficient damping. In this study, the interaction between the LC filter and the load converter is analyzed.…”

Section: Introductionmentioning

confidence: 99%

Impedance-Based Modeling and Common Bus Stability Enhancement Control Algorithm in DC Microgrid

Lee

Park

et al. 2020

IEEE Access

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In this paper, impedance modeling of a DC microgrid system consisting of a source and load converter, including an input filter, is performed. Impedance-based modeling has been used to derive mathematical models of the output impedance of the source converter and the input impedance of the load converter. The correlation between the converter interaction and system stability is analyzed based on the mathematical model. An impedance-based stability analysis is used to determine the system stability by analyzing the interactions among the converters in the DC microgrid system. Middlebrook's stability criterion, which uses the impedance transfer function, is applied to determine system stability. Moreover, in this paper, a stability enhancement control algorithm is proposed to resolve the system instabilities resulting from interaction among the converters and the distortion caused by the harmonics emanating from the AC input. The proposed stability enhancement control algorithm consists of a feed-forward type virtual impedance (VI) and a proportional-resonant (PR) controller. The validity of the proposed method is demonstrated by the results of the response characteristics in the frequency domain, and the effectiveness of the proposed control algorithm is verified via simulations and prototype experimental models.

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Modeling and Resonance Analysis of Parallel Grid-Connected Inverters with LCL Filters

Bourogaoui¹,

Houari²,

Houda³

et al. 2018

2018 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM)

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A self-switched virtual impedance based stabilization method for a droop controlled DC microgrid with Constant Power Loads and input load filters

Cited by 8 publications

References 13 publications

A Stability Improvement Method of DC Microgrid System Using Passive Damping and Proportional-Resonance (PR) Control

A Stability Improvement Method of DC Microgrid System Using Passive Damping and Proportional-Resonance (PR) Control

Impedance-Based Modeling and Common Bus Stability Enhancement Control Algorithm in DC Microgrid

Modeling and Resonance Analysis of Parallel Grid-Connected Inverters with LCL Filters

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