Why Ideal Constant Power Loads Are Not the Worst Case Condition From a Control Standpoint

Cupelli, Marco; Zhu, Lin; Monti, Antonello

doi:10.1109/tsg.2014.2361630

Cited by 75 publications

(35 citation statements)

References 33 publications

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“…If output voltage v out (t) is the desired control variable, which is the case for voltage mode as well as for an outer voltage loop around a current-controlled converter, K has to be chosen as (8).…”

Section: Voltage Mode or Outer Voltage Loopsmentioning

confidence: 99%

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A Building-Block Approach to State-Space Modeling of DC-DC Converter Systems

Herbst

2019

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Small-signal models of DC-DC converters are often based on a statespace averaging approach, from which both control-oriented and other frequencydomain characteristics, such as input or output impedance, can be derived. Updating these models when extending the converter by filters or non-trivial loads, or adding control loops, can become a tedious task, however. To simplify this potentially error-prone process, a modular modeling approach is being proposed in this article. It consists of small state-space models for certain building blocks of a converter system on the one hand, and standardized operations for connecting these subsystem models to an overall converter system model on the other hand. The resulting state-space system model builds upon a two-port converter description and allows the extraction of control-oriented and impedance characteristics at any modeling stage, be it open loop or closed loop, single converter or series connections of converters. The ease of creating more complex models enabled by the proposed approach is also demonstrated with examples comprising multiple control loops or cascaded converters.

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Section: Voltage Mode or Outer Voltage Loopsmentioning

confidence: 99%

“…Matters of particular interest are impedance analysis [2,4,38], implications for controller design [1,16,25] and, of course, stability [3,18,23]. It has been pointed out [8,36] that studying detailed dynamic interactions between source and load converters is important for stability analysis, going beyond constant power load assumptions.…”

Section: Introductionmentioning

confidence: 99%

A Building-Block Approach to State-Space Modeling of DC-DC Converter Systems

Herbst

2019

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“…The second-stage converter can often be treated as a constant power load (CPL) on the first-stage converter. Because of its negative impedance, the CPL will affect the stability of the cascaded system [9,10]. In summary, DC/DC converters in distributed power supply systems have varied and complex inputs and loads.…”

Section: Introductionmentioning

confidence: 99%

Inverse-System Decoupling Control of DC/DC Converters

Zhu

Huang

et al. 2019

Energies

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Existing large-signal control schemes for DC/DC converters formulate control strategies based primarily on nonlinear control theory, and the associated design and implementation are relatively complex. In this work, a decomposition modeling and inverse-system decoupling control method is proposed for DC/DC converters that operate under large-signal disturbances. First, a large-signal circuit-averaged model for DC/DC converters is established. The proposed control system has a double closed-loop control structure composed of a voltage loop and a current loop. Then, the voltage-loop and current-loop controlled subsystems are decoupled and compensated to first-order integral elements using the inverse system method. Several linear feedback controllers are designed for first-order integral systems under various optimization criteria using the optimal control theory. Simulation and experiment were performed on buck–boost converters with resistive and constant power loads. The results show that under the control of the proposed controller, all systems exhibited excellent dynamic and steady-state performance. The proposed method allows the disturbance control of the DC/DC converter, the dynamic behavior control of the voltage loop, and the current loop to become independent processes. The local controller design follows the classical linear control design method and is a simple and effective large-signal control strategy.

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“…In effect, a well-known challenge in power electronics driven systems is that they are susceptible to instability from the load side because of the CPL behavior enforced by fast controller regulation. Concisely, CPLs exhibit a negative incremental resistance behavior, which may drive the system to instability [2]. The effect of CPLs is not only restricted to DC systems but is also present in AC systems [3].…”

Section: Introductionmentioning

confidence: 99%

A Structure Preserving Approach for Control of Future Distribution Grids and Microgrids Guaranteeing Large Signal Stability

Cupelli

Bhanderi

Gurumurthy

et al. 2018

2018 IEEE Conference on Control Technology and Applications (CCTA)

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This paper describes the application of the Port Controlled Hamiltonian Network for Modelling and Control of non-linear power system dynamics. Goal of this work is to propose a methodology for system level design for power electronics driven electrical networks able to guarantee large signal stability. Starting from a model-level modular approach, the system is defined using the interconnection concept. The paper focuses on a DC micro-grid scenario where several converters interact with a lumped load. Contrary to previous work, the load is modelled as a Constant Power Load (CPL) introducing new challenges in terms of system stability.

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Why Ideal Constant Power Loads Are Not the Worst Case Condition From a Control Standpoint

Cited by 75 publications

References 33 publications

A Building-Block Approach to State-Space Modeling of DC-DC Converter Systems

A Building-Block Approach to State-Space Modeling of DC-DC Converter Systems

Inverse-System Decoupling Control of DC/DC Converters

A Structure Preserving Approach for Control of Future Distribution Grids and Microgrids Guaranteeing Large Signal Stability

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