Operation and Control-Oriented Modeling of a Power Converter for Current Balancing and Stability Improvement of DC Active Distribution Networks

Lago, Jackson; Heldwein, Marcelo Lobo

doi:10.1109/tpel.2011.2105284

Cited by 116 publications

(49 citation statements)

References 23 publications

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“…Even though droop-controlled schemes are implemented in each electronic power component of a microgrid, instability problems can appear as a result of the tight and separate regulation of the controllers [11]. It is noted that droop-control in the case of DC distribution grids conventionally includes a regulator that provides an output voltage correction that is inversely proportional to the output power in accordance to the droop coefficient [12].…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of DC Distribution Systems with Droop-Based Charge Sharing on Energy Storage Devices

Makrygiorgou

Alexandridis

2017

Energies

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Direct current (DC) distribution systems and DC microgrids are becoming a reliable and efficient alternative energy system, compatible with the DC nature of most of the distributed energy resources (DERs), storage devices and loads. The challenging problem of redesigning an autonomous DC-grid system in view of using energy storage devices to balance the power produced and absorbed, by applying simple decentralized controllers on the electronic power interfaces, is investigated in this paper. To this end, a complete nonlinear DC-grid model has been deployed that includes different DC-DERs, two controlled parallel battery branches, and different varying DC loads. Since many loads in modern distribution systems are connected through power converters, both constant power loads and simple resistive loads are considered in parallel. Within this system, suitable cascaded controllers on the DC/DC power converter interfaces to the battery branches are proposed, in a manner that ensures stability and charge sharing between the two branches at the desired ratio. To achieve this task, inner-loop current controllers are combined with outer-loop voltage, droop-based controllers. The proportional-integral (PI) inner-loop current controllers include damping terms and are fully independent from the system parameters. The controller scheme is incorporated into the system model and a globally valid nonlinear stability analysis is conducted; this differs from small-signal linear methods that are valid only for specific systems, usually via eigenvalue investigations. In the present study, under the virtual cost of applying advanced Lyapunov techniques on the entire nonlinear system, a rigorous analysis is formulated to prove stability and convergence to the desired operation, regardless of the particular system characteristics. The theoretical results are evaluated by detailed simulations, with the system performance being very satisfactory.

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Section: Introductionmentioning

confidence: 99%

Stability Analysis of DC Distribution Systems with Droop-Based Charge Sharing on Energy Storage Devices

Makrygiorgou

Alexandridis

2017

Energies

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“…Researches of ADNs have been focused on the theories and technologies of ADN measurement, protection and control, and a series of achievements have been published [7][8][9][10][11][12]. Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Refs. [9][10][11][12] investigated the mechanism, models, and approaches of ADN control. Besides, http://dx.doi.org/10.1016/j.apenergy.2015.02.084 0306-2619/Ó 2015 Elsevier Ltd. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Customer satisfaction based reliability evaluation of active distribution networks

Bie

Xie

et al. 2016

Applied Energy

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“…Though the DC DPS has been developed for many years, the stability is still a big puzzle for engineers. Every converter in the system is well designed based on the stand alone operation with sufficient stability, but in the system level, the stability is still a big potential issue due to the complex interaction among the converters and the intrinsic nonlinearity of converter itself, especially for the large scaled DC DPS with complex load condition [4]. In the DC DPS system, the power source provides energy to the DC bus through source converter, and the load consumes power from the DC bus through a load converter.…”

Section: Introductionmentioning

confidence: 99%

Stability Criterion for Cascaded System With Constant Power Load

Wei

Zhang

et al. 2013

IEEE Trans. Power Electron.

227

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With the development of renewable energy, DC distribution power system (DPS) becomes more and more attractive. The stability of whole system is still a big concern though every single converter is well-designed based on the stand alone operation with sufficient stability. Since the cascaded connection of power converters is one of the most dominant connection forms in the DC DPS, the stability analysis of the cascaded system is very important to ensure stability of the whole system. Based on Lyapunov linearization method and Brayton-Moser's mixed potential theory, stability of equilibrium point and an estimation of the region of attraction are investigated for cascaded system in the DC DPS. Based on the analysis, stability prediction criteria for cascaded system under small-signal and large-signal disturbance are obtained. The two criteria is simple and straightforward, which can be unified to get a general stability criterion to predict system's stability under both small-signal and large-signal transient disturbance. The relationship between system parameters and the stability is presented and discussed in the paper. Therefore, instead of trial and error, the proposed criterion can predict and guarantee the stability operation of cascaded system during the design process, and it is also helpful to select matched power converters in system level design. The simulation and experimental results verify the effectiveness of the proposed criterion.

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Operation and Control-Oriented Modeling of a Power Converter for Current Balancing and Stability Improvement of DC Active Distribution Networks

Cited by 116 publications

References 23 publications

Stability Analysis of DC Distribution Systems with Droop-Based Charge Sharing on Energy Storage Devices

Stability Analysis of DC Distribution Systems with Droop-Based Charge Sharing on Energy Storage Devices

Customer satisfaction based reliability evaluation of active distribution networks

Stability Criterion for Cascaded System With Constant Power Load

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