An Approach for Buck Converter PI Controller Design Using Stability Boundary Locus

Garg, Man Mohan; Hote, Yogesh V.; Pathak, Mukesh Kumar; Behera, Laxmidhar

doi:10.1109/tdc.2018.8440291

Cited by 34 publications

(17 citation statements)

References 12 publications

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“…[33]. To make the buck converter model more precise, many parameters have been added to the basic transfer function as in [34]. After substituting all components values in the transfer function as in ( 8) & ( 9), Matlab is used to find the Z-transform of the transfer function using zero-order hold (ZOH) model as in (10).…”

Section: Control Structure and Mode Selectionmentioning

confidence: 99%

A Method of Seamless Transitions Between Different Operating Modes for Three-Port DC-DC Converters

Aljarajreh

Siwakoti

et al. 2021

IEEE Access

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This paper presents the design of three-port converters (TPCs) for smooth transitions (i.e., fast settling time, and no obvious overshoot/undershoot) of 7 distinctive operating modes, depending on sources and loads scheduling. Two viable converter configurations have been identified and selected for further analysis and design of PV-battery systems. Conventionally, mode transition is achieved by assigning specific switching patterns through feedback signals and appropriate control algorithms. This incurs a delay in the response and unavoidable noise in the circuit. Additionally, in TPCs, three voltage sensors and three current sensors are generally required for decision making in mode selection, where errors in sensors may lead to an inaccurate response. This paper presents a new control strategy where the number of switching patterns is significantly reduced to 3 patterns instead of minimum 5 patterns for existing reported topologies. Therefore, decisions are simplified so that the transition occurs naturally based on the power availability and load demand but not deliberately as in the conventional method. In addition, instead of six sensors, three voltage sensors and only one current sensor are required to achieve all the necessary operations, namely, MPPT, battery protection, and output regulation. Moreover, these sensors do not participate in mode selection decision, which leads to seamless and fast mode transition. In addition, this work considers two bidirectional ports as compared with only one bidirectional port in most reported topologies. This configuration enables both standalone and DC grid-connected applications. Experimental results are reported to verify the proposed solution.INDEX TERMS Auto-transition, battery, bidirectional converter, mode selection, photovoltaic system and three-port converter.

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Section: Control Structure and Mode Selectionmentioning

confidence: 99%

A Method of Seamless Transitions Between Different Operating Modes for Three-Port DC-DC Converters

Aljarajreh

Siwakoti

et al. 2021

IEEE Access

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“…2, the switching frequency (fsw) of the converter is 20 kHz and the switching period (T) is equal to 1/fsw. It is worthy to mention that the parameters of the Buck converter under study are based on the work presented in [11]. These parameters are summarized in Table I.…”

Section: A Modeling Of a Buck Convertermentioning

confidence: 99%

“…The first-order terms from the Taylor series of ( 10) are considered to derive a small-signal model for the PWM modulator, defined in (11). The constant gains k1 and k2 relate small changes in duty-ratio to small changes in Vg and Vm.…”

Section: (A) To Combine Ivff Control With Feedback Controlmentioning

confidence: 99%

“…Despite the availability of several robust non-linear control techniques, such as sliding-mode control, used to implement voltage-mode feedback, all previously reported techniques have some limitations related to electromagnetic interference, complexity, and sensitivity [11]. Alternatively, linear control techniques, such as PI, PID and lag-lead controllers are used in more than 95% of the controllers since they are easy to design [12].…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, linear control techniques, such as PI, PID and lag-lead controllers are used in more than 95% of the controllers since they are easy to design [12]. A well-designed feedback PI controller is generally sufficient to stabilize a second-order DC-DC Buck converter [11]. However, in some cases, Vo can experience large overshoots in response to Vg variation.…”

Section: Introductionmentioning

confidence: 99%

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Design and Analysis of Combined Input-Voltage Feedforward and PI Controllers for the Buck Converter

Amer

Abuelnasr

Ragab

et al. 2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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This paper presents the design and analysis of combining input-voltage feedforward and proportional-integral (PI) controllers to regulate the output voltage of DC-DC Buck converter subject to input line disturbances. Non-idealities of the Buck converter such as passive and active components parasitics are included in the mathematical model obtained by the statespace averaging (SSA) technique for accurate control. The stability boundary locus approach is used to graphically analyze the system stability. It guides the design of the PI controller gains and the feedforward scaling factor to achieve desired phase and gain margins. Analysis shows that the feedforward scaling factor affects the stability regions of the closed-loop system and can limit the possible PI controller gains for certain phase and gain margins; 75 o and 9.54 dB in our case. The results are verified by a Simulink model developed for the Buck converter system.

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Robust control strategies applicable to DC–DC converter with reliability assessment: A review

Gupta,

Garg

et al. 2024

Adv Control Appl

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This paper provides an overview of various control strategies for DC–DC converters along with a brief discussion on various performance indices for evaluating the reliability of designed controller. DC–DC converters are emerging as the fastest‐growing interfacing devices in the world because of their emergent applications in almost all domains of engineering. Notably, the non‐linear behavior of DC–DC converters offers a perplexing problem in designing a robust controller. A robust controller must ensure proper closed‐loop stability with desired performance and reliable control for output voltage regulation in the event of various possible perturbations. This creates the requirement for practically implementable non‐linear controllers that can effectively overlook the drawbacks of linear controllers. The prominence of this composition is based on the expansion in tuning techniques of proportional‐integral‐derivative controller gain parameters using linear strategies and heading towards non‐linear strategies by reviewing 196 research papers. The modification in non‐linear control strategies in terms of their fundamental features associated with key benefits and limitations are comprehensively reviewed. This study mostly revolves around non‐linear internal model control (IMC) strategies for parameter tuning of IMC‐based controllers for various order of plants with an improved degree of freedom.

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An Approach for Buck Converter PI Controller Design Using Stability Boundary Locus

Cited by 34 publications

References 12 publications

A Method of Seamless Transitions Between Different Operating Modes for Three-Port DC-DC Converters

A Method of Seamless Transitions Between Different Operating Modes for Three-Port DC-DC Converters

Design and Analysis of Combined Input-Voltage Feedforward and PI Controllers for the Buck Converter

Robust control strategies applicable to DC–DC converter with reliability assessment: A review

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