A systematic approach to constant power load stabilization by passive damping

Mayo-Maldonado, Jonathan C.; Rapisarda, Paolo

doi:10.1109/cdc.2015.7402398

Cited by 6 publications

(5 citation statements)

References 20 publications

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“…A simple solution is to (sufficiently) increase the damping of the system by connecting a positive impedance in parallel to the P-load. In the literature, this technique is called passive-damping (see for instance [18,19] and the references therein). However, besides increasing the size, weight and cost of the system, this method requires extra power for supplying the added impedance.…”

Section: Literature Reviewmentioning

confidence: 99%

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Voltage control of DC networks: robustness for unknown ZIP-loads

Cucuzzella¹,

Kosaraju²,

Scherpen³

2019

Preprint

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In this paper we propose a new passivity-based control technique for DC power networks comprising the so-called ZIP-loads, i.e., nonlinear loads with the parallel combination of unknown constant impedance (Z), current (I) and power (P) components. More precisely, we propose a novel passifying input and a storage function based on the so-called mixed potential function introduced by Brayton and Moser, leading to a novel passivity property with output port-variable equal to the first time derivative of the voltage. Differently from the existing results in the literature, where restrictive (sufficient) conditions on Z, P and the voltage reference are assumed to be satisfied, we establish a passivity property for every positive voltage reference and every type of load. Consequently, we develop a new decentralized passivity-based control scheme that is robust with respect to the uncertainty affecting the ZIP-loads.

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Section: Literature Reviewmentioning

confidence: 99%

“…Proposition 5 (Bregman distance). System (10) is (shifted) passive ¶ with respect to the storage function (19) and supply rate (u − u * ) (I s − I s ), for all the trajectories (I s , I t , V ) ∈ X B .…”

Section: S(imentioning

confidence: 99%

Voltage control of DC networks: robustness for unknown ZIP-loads

Cucuzzella¹,

Kosaraju²,

Scherpen³

2019

Preprint

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show abstract

“…This introduces a negative damping into the system and has a destabilizing effect. To stabilize DCmG while using these loads, the existing approaches in literature [4,24,17,33] exploit the local addition of positive impedance but are restricted to specific topologies and are not scalable. A power consensus algorithm for ZIP loads is studied in [11], but again, is limited to mGs with static lines and approximate DGU models.…”

Section: Introductionmentioning

confidence: 99%

A passivity-based approach to voltage stabilization in DC microgrids with ZIP loads

Nahata

Soloperto

Tucci³

et al. 2020

Automatica

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We consider the application of passivity theory to the problem of voltage stabilization in DC microgrids, which are composed of distributed generation units, dynamic RLC lines, and nonlinear ZIP (constant impedance, constant current, and constant power) loads. To this aim, we first study the stable interconnections of constrained passive systems and later consider its applications to microgrids. More specifically, we consider the decentralized multivariable PI controllers proposed in [29], and show that they passivate the generation units and the associated loads under certain conditions. To prove voltage stability in the closed-loop microgrid, we exploit properties of interconnection, passivity of individual components, and the LaSalle's invariance theorem. Moreover, we provide explicit inequalities on control gains to design stabilizing controllers. Control synthesis requires only the knowledge of local parameters and is always feasible allowing removal and addition of DGUs in a plug-n-play fashion. Theoretical results are backed up by simulations in PSCAD.

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“…To overcome the problem of voltage fluctuation caused by CPLs, the instability mechanism of CPLs has been widely studied and several solutions have been proposed [7,8]. In the past few years, some researchers have tried to solve such instability phenomena by a passive method [9][10][11]. Generally speaking, this method requires additional physical dampers.…”

Section: Introductionmentioning

confidence: 99%

“…And the response speed of the system is also affected to some extent. Based on the same idea, a physical filter containing multiple capacitors and resistors is applied to eliminate the impact of constant power loads [11]. However, the use of multiple resistors will make the power loss greater.…”

Section: Introductionmentioning

confidence: 99%

Research on Virtual Inductive Control Strategy for Direct Current Microgrid with Constant Power Loads

et al. 2019

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In order to improve the stability of direct current (DC) microgrid with constant power loads, a novel virtual inductive approach is proposed in this paper. It is known that the negative impedance characteristic of constant power loads will lead to DC bus voltage fluctuation, which will be more serious when they integrate into the DC microgrid though a large transmission line inductive. For the convenience of analysis, a simplified circuit model of the system is obtained by modeling the distributed resources. Unlike the existing control strategies, the proposed control strategy constructs a negative inductance link, which helps to counteract the negative effects of the line inductive between the power source and the transmission line. Detailed performance comparison of the proposed control and virtual capacitance are implemented through MATLAB/simulink simulation. Moreover, the improved performance of the proposed control method has been further validated with several detailed studies. The results demonstrate the feasibility and superiority of the proposed strategy.

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A systematic approach to constant power load stabilization by passive damping

Cited by 6 publications

References 20 publications

Voltage control of DC networks: robustness for unknown ZIP-loads

Voltage control of DC networks: robustness for unknown ZIP-loads

A passivity-based approach to voltage stabilization in DC microgrids with ZIP loads

Research on Virtual Inductive Control Strategy for Direct Current Microgrid with Constant Power Loads

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