Current Sharing Based on Incremental Passivity and Unknown Load Finite-Time Estimation for Multilevel Connected DC–DC Converters

Liu, Jia; Liu, Zhitao; Chen, Wenjie; Su, Hongye; Zhang, Liyan

doi:10.1109/tie.2021.3053883

Cited by 6 publications

(5 citation statements)

References 31 publications

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“…In the power supply control system, the control algorithm adjusts the load voltage output, and the modulation algorithm converts the voltage into PWM control. However, the modulation algorithm usually has a delay [27], so the modulation delay link is summarized in the system model.

\begin{equation}\left\{ { \def\eqcellsep{&}\begin{array}{@{}*{1}{c}@{}} {\left( {{L}_1s + {R}_1} \right){i}_1 + \left( {Ls + R} \right){i}_L = {u}_1K{e}^{ - Ts}}\\[2pt] {\left( {{L}_2s + {R}_2} \right){i}_2 + \left( {Ls + R} \right){i}_L = {u}_2K{e}^{ - Ts}}\\[2pt] \vdots \\[2pt] \def\eqcellsep{&}\begin{array}{l} \left( {{L}_ns + {R}_n} \right){i}_n + \left( {Ls + R} \right){i}_L = {u}_nK{e}^{ - Ts}\\[2pt] {i}_1 + {i}_2 \cdots + {i}_n = {i}_L \end{array} \end{array} } \right.\end{equation}

…”

Section: Preliminariesmentioning

confidence: 99%

“…And this finite‐time t satisfies

T \le \frac{{V{{({x}_0)}}^{1 - \alpha }}}{{c( {1 - \alpha } )}}

. Lemma [23]: For the following systems:

\begin{equation} \def\eqcellsep{&}\begin{array}{l} {{\dot{e}}}_1 = \varphi (t){e}_2 - \varphi (t){k}_1si{g}^{{\beta }_1}({e}_1)\\[3pt] {{\dot{e}}}_2 = - \varphi (t){k}_2si{g}^{{\beta }_2}({e}_1) \end{array} \end{equation}

where

\phi ( t ) &gt; 0,\ 0 \le {\beta }_1 \le 1,\ \ {\beta }_2 = \ 2{\beta }_1 - 1

, there are appropriate gains k 1 and k 2 to make the system stable for a finite time. The stability theory is derived from references [26, 27]. The proof is too long and will not be explained here.…”

Section: Preliminariesmentioning

confidence: 99%

Section: Model Of Parallel H-bridge Convertersmentioning

confidence: 99%

“…where 𝜙(t ) > 0, 0 ≤ 𝛽 1 ≤ 1, 𝛽 2 = 2𝛽 1 − 1, there are appropriate gains k 1 and k 2 to make the system stable for a finite time. The stability theory is derived from references [26,27].…”

Section: And This Finite-time T Satisfies T ≤mentioning

confidence: 99%

“…An efficient finite time current sharing controller (FTCs) regulates the output voltage and system current sharing [26]. On this basis, for the unknown load in the power system, an adaptive algorithm based on finite-time control is used to observe the load parameters, which can provide a faster response speed [27].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Finite‐time observer and current sharing control for disturbance compensation of parallel H‐bridge converters

Chen,

Fang,

Yang

et al. 2023

IET Control Theory & Appl

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Both electric vehicles and Tokamak power supply use multiple parallel converters to realize high current operation in four quadrants. A finite‐time current sharing control algorithm based on disturbance compensation is proposed to improve the converter system's dynamic and steady‐state performance so that the system can achieve the required load current and branch‐current sharing in a finite time. In the proposed algorithm, this paper adopts a finite‐time observer for unknown disturbances in the converter system and load circuit due to disturbances, such as unknown inductance and resistance in the converter system. The results show that the load current control overshoot is minimal, and the dynamic performance of each branch current is higher than the traditional control algorithm.A finite‐time current sharing control algorithm based on disturbance compensation is proposed so that the converter system can achieve the required load current and branch current sharing in a finite time.

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