Discrete-Time Tool for Stability Analysis of DC Power Electronics-Based Cascaded Systems

Zadeh, Mehdi Karbalaye; Gavagsaz-Ghoachani, Roghayeh; Martin, Jean‐Philippe; Pierfederici, Serge; Nahid‐Mobarakeh, Babak; Molinas, Marta

doi:10.1109/tpel.2016.2526740

Cited by 74 publications

(37 citation statements)

References 52 publications

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“…To evaluate the proposed EMS, constant power load (CPL) [50] models were selected due to their widely use in DC MGs analyses [51][52][53][54][55]. That representation has the main characteristic of changing both the load current and voltage to keep the load consumption constant; therefore, when the bus voltage exhibited perturbations, the load current changed accordingly.…”

Section: Devices and Control Strategiesmentioning

confidence: 99%

Energy Management in PV Based Microgrids Designed for the Universidad Nacional de Colombia

et al. 2020

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Stand-alone Electrical microgrids (MGs) require power management strategies to extend the life-time of their devices and to guarantee the global power balance of non-critical loads such as lighting of small sections of an university campus or individual air conditioning systems. This paper proposes an energy management strategy (EMS) for an isolated DC microgrid formed by a photovoltaic system (PVS), an energy storage system (battery), and a noncritical load. This configuration enables the photovoltaic system to control the power generation and ensures that the storage element does not exceed the safe limits of the state of charge. To control the generation of the photovoltaic system, two operating modes based on the perturb and observe (P&O) algorithm are implemented. The first one performs a maximum power point tracking (MPPT) action, while the second one regulates the power generated by the PVS to match the load requirement (power demand tracking, PDT). The management strategy also considers different operating states for ensuring the battery safety: normal operation, overcharge (at the maximum state of charge), and bulk charge (at the minimum state of charge); in those states the disconnection/connection of both the battery and the load is also considered. The main contribution of this work is to design and test a control strategy for an EMS aimed at regulating a standalone microgrid based on a PV system and an energy storage device. This solution is validated using detailed MG circuital simulations, which includes the PV source model (single-diode model), lithium-ion battery model, constant power load model and the DC/DC converters equations; moreover, realistic power generation and demand from Universidad Nacional de Colombia, located at Medellín-Colombia, are considered. The results obtained demonstrate the effectiveness of the energy management strategy, and in this way, enable to extend the battery lifetime and reduce the costs associated to the maintenance and disconnection of the microgrid in educational buildings or other applications focused on this type of DC microgrid.

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Section: Devices and Control Strategiesmentioning

confidence: 99%

Energy Management in PV Based Microgrids Designed for the Universidad Nacional de Colombia

et al. 2020

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“…For a matrix M , let ||M || be the 2 norm of M . Recall that if M is symmetric, ||M || equals the largest absolute eigenvalue of M , and the 2 norm of the diagonal matrix n k=1 ∆δ k D 3n+k equals δ max , from equation (8) we have ||Q j || ≤ 2||P || · || n k=1 ∆δ k D 3n+k || ≤ 2t · δ max < γ, (14) hence, the largest absolute eigenvalue of each Q j is less than γ, and P A v j + (A v j ) T P is negative definite, j = 1, · · · , 2 n . This completes the proof.…”

Section: Appendix a Proof Of Lemmamentioning

confidence: 99%

“…DC microgrids are finding various applications in more electric aircraft, naval ships, data centers, among others [5]- [10]. With advanced power electronic devices, the transient behavior in the power outputs of many loads can be neglected, and these loads can be modeled as constant power loads (CPLs) [11]- [14].…”

Section: Introductionmentioning

confidence: 99%

Robust stability analysis of DC microgrids with constant power loads

Liu

Zhang

Rizzoni

2017

2017 American Control Conference (ACC)

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Abstract-This paper studies stability analysis of DC microgrids with uncertain constant power loads (CPLs). It is well known that CPLs have negative impedance effects, which may cause instability in a DC microgrid. Existing works often study the stability around a given equilibrium based on some nominal values of CPLs. However, in real applications, the equilibrium of a DC microgrid depends on the loading condition that often changes over time. Different from many previous results, this paper develops a framework that can analyze the DC microgrid stability for a given range of CPLs. The problem is formulated as a robust stability problem of a polytopic uncertain linear system. By exploiting the structure of the problem, we derive a set of sufficient conditions that can guarantee robust stability. The conditions can be efficiently checked by solving a convex optimization problem whose complexity does not grow with the number of buses in the microgrid. The effectiveness and nonconservativeness of the proposed framework are demonstrated using simulation examples.

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“…With the recent technological developments, DC power systems have been even more applicable and they have been installed for the small ferries. However, instability is still a major issue in the design of DC power systems necessitating reliable modeling tools [5] and particularly with multiple converter-controlled propulsion drives acting as constant power load (CPL) [6]. Catching up with this trend, an overview of the modeling and control for the shipboard DC power systems have been studied.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Modeling and Stability Analysis of Onboard DC Power System for Hybrid Electric Ships

Park

Zadeh

2019

2019 IEEE Transportation Electrification Conference and Expo (ITEC)

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This paper presents the dynamic modeling and stability analysis of the onboard DC power system, applicable to hybrid electric ships. The system topology is established with a special focus on the integration of the energy carriers with power electronic converters. The modeling of the AC/DC rectifier, DC/DC converter, filters and energy storage systems (ESS), such as battery and supercapacitor, is investigated. AC/DC rectifier is modeled with decoupling control through an LCL filter, and the DC/DC converter modeling is compared with the state-space averaging method and generalized averaging method. The performance of the integrated model is presented both in charging mode and in discharging mode of the energy storage system and the results show the effectiveness of the controllers and the power regulation of the ESSs. In the end, the limitation of the load is obtained by the stability analysis.

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Discrete-Time Tool for Stability Analysis of DC Power Electronics-Based Cascaded Systems

Cited by 74 publications

References 52 publications

Energy Management in PV Based Microgrids Designed for the Universidad Nacional de Colombia

Energy Management in PV Based Microgrids Designed for the Universidad Nacional de Colombia

Robust stability analysis of DC microgrids with constant power loads

Dynamic Modeling and Stability Analysis of Onboard DC Power System for Hybrid Electric Ships

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