High-Performance Three-Phase PWM Converter With a Reduced DC-Link Capacitor Under Unbalanced AC Voltage Conditions

Ren, Chunguang; Han, Xiaoqing; Wang, Lei; Yu, Yang; Qin, Wenping; Wang, Peng

doi:10.1109/tie.2017.2688962

Cited by 52 publications

(25 citation statements)

References 34 publications

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“…By considering all the AC side parameters of SR in Fig. 1, a set of per-phase differential equations can be written as (5) in abc frame, which they have sinusoidal time-variation.…”

Section: B Dynamic Model and Control Of Srmentioning

confidence: 99%

“…Therefore, employment of a higher-order controller like PR is necessary. In [5], a capacitor optimization along with a ripple compensation technique for DC voltage of SR is proposed based on αβ theory in unbalanced networks. A direct power control strategy in the αβ frame for three-phase voltagesource rectifiers based on extended-state observation is discussed in [6].…”

Section: Introductionmentioning

confidence: 99%

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Finite-Time Disturbance-Observer-Based Integral Terminal Sliding Mode Controller for Three-Phase Synchronous Rectifier

Eskandari¹,

Yousefpour

Ayati

et al. 2020

IEEE Access

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This article is concerned with the design of a finite-time disturbance-observer-based integral terminal sliding mode controller for the effective performance of three-phase synchronous rectifiers. The proposed control technique is developed based on the conventional synchronous reference frame model of the three-phase grid-connected converter, and the system dynamics is described in terms of a time-varying non-linear state equation. The variation of DC-load is considered as a disturbance. Therefore, a combination of a fast disturbance observer and an integral terminal sliding mode controller is utilized to produce the reference value of the direct axis for the current control loop. In this research, by employing Lyapunov stability theorem in the theoretical analysis and by numerical simulations, it is confirmed that the proposed closed-loop system is stable and the states converge to desired values in finite time even in the presence of load disturbance and control input saturation. The integral terminal sliding mode controller is utilized to maintain a robust performance along with a faster response of the converter. In order to demonstrate the performance ability of the proposed control scheme under real condition, an AC power source, impregnated with low order harmonics, is assumed. A real-time laboratory setup of the synchronous rectifier has been developed successfully, and the effective performance of the proposed control technique is fully proven.

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“…By considering all the AC side parameters of SR in Fig. 1, a set of per-phase differential equations can be written as (5) in abc frame, which they have sinusoidal time-variation.…”

Section: B Dynamic Model and Control Of Srmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Finite-Time Disturbance-Observer-Based Integral Terminal Sliding Mode Controller for Three-Phase Synchronous Rectifier

Eskandari¹,

Yousefpour

Ayati

et al. 2020

IEEE Access

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show abstract

“…the DC source can be free of ripples, and at the same time, the AC output currents (or voltages) can be balanced and sinusoidal. Compared with the approach in [22], the improved topology will not increase the system size and cost, since the added path can be easily integrated into the power board.…”

Section: A Circuit Configuration and Operating Principlesmentioning

confidence: 99%

“…Besides, it cannot be used for the transformerless PV systems. To overcome the drawback, another topology was proposed in [22], where additional power semiconductors and passive components were added to the DC link in order to absorb the ripple power. While this method is feasible, it requires extra hardware which will greatly increase the size and cost of the system, and thus are not preferred as well.…”

Section: Introductionmentioning

confidence: 99%

An Improved Three-Phase Voltage Source Converter With High-Performance Operation Under Unbalanced Conditions

et al. 2018

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The unbalance of the three-phase grid-voltages/loads can cause double-frequency power ripples in the voltage source converter (VSC) system. Such power ripples can further lead to current and/or voltage ripples on the dc link, which may create instability of the system, lower its efficiency and shorten the lifetime of dc sources (e.g., batteries). Existing control solutions cannot well solve this issue and even bring collateral damage. Several hardware solutions have recently been proposed to tackle these issues, but these methods suffer from large size, high cost, and reduced system reliability. Instead, this paper proposed an improved topology to handle the problems faced by the VSC under unbalanced conditions. Although, hardware modification is also needed, it will not increase the size and cost of the system, since only one connecting line is added, which can be easily made on the power-stage printed circuit board. Moreover, the improved topology can also be used to reduce the leakage current in transformerless photovoltaic system and to eliminate the high frequency circulating current in multiple parallel converters. Theoretical analysis, simulation, and experimental results are provided to explain the principle and to validate the effectiveness of the improved topology.INDEX TERMS Grid-connected, islanded, power ripple, three-phase unbalance, voltage source converter.FEN TANG received the B.S. degree in electrical engineering and the Ph.D. degree in power electronics and electric drives from

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“…side of the cascaded converter and MMC, high-value bulky capacitors are needed to buffer the double-line-frequency (DLF) power oscillation that leads to the space volume problem [17], [18], which may restrict its development in real world application.…”

mentioning

confidence: 99%

Two-Type Single-Stage Isolated Modular Multilevel Cascaded Converter (I-M2C2) Topologies

et al. 2019

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This paper introduces two types of single-stage highfrequency isolated converters named isolated modular multilevel converter (I-M 2 C) and isolated modular cascaded converter (I-MC 2), which are both based on the high-frequency-link concept. The two converters can totally reduce the individual DC-link capacitors at the high-voltage (HV) side and simplify the voltage balancing control. The fundamental principle and applied modulation strategy scheme of I-M 2 C and I-MC 2 are given in details. The operation mode of I-M 2 C is analysed as an example. Experimental results are given respectively to illustrate the efficient operating characteristics of the two new types of converters. Index Terms-High-frequency-link (HFL), hybrid AC and DC power conversion, isolated modular multilevel cascaded converter (I-M 2 C 2), solid-state transformer. I. IntroductIon C URRENTLY, with the burgeoning development of power semiconductor technology, solid-state transformer (SST) [1]-[7] has been conceived as a replacement for the conventional line-frequency transformer providing galvanic isolation by means of medium/high-frequency transformers. SST is a key equipment in the future solid-state substation (SSS) [8] with hybrid AC and DC power conversion function, which is easy for the flexible grid integration of renewable energy systems [9], [10]. Modular architecture can bring advantages to the power and voltage scalability and maintenance, as well as the fault-tolerance strategy implementation, and the SST modular systems are generally based on the input-series outputparallel (ISOP) configuration of converter cells, which could be classified into two broad categories: the cascade H-bridge (CHB) converter [11]-[15] and the MMC [7]-[16] based structures as shown in Fig. 1. From the high-voltage AC side to the common low-voltage DC side, the two structures both have two-stage power conversion. Because of the galvanic isolation for the individual DC Manuscript received January 27, 2019.

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High-Performance Three-Phase PWM Converter With a Reduced DC-Link Capacitor Under Unbalanced AC Voltage Conditions

Cited by 52 publications

References 34 publications

Finite-Time Disturbance-Observer-Based Integral Terminal Sliding Mode Controller for Three-Phase Synchronous Rectifier

Finite-Time Disturbance-Observer-Based Integral Terminal Sliding Mode Controller for Three-Phase Synchronous Rectifier

An Improved Three-Phase Voltage Source Converter With High-Performance Operation Under Unbalanced Conditions

Two-Type Single-Stage Isolated Modular Multilevel Cascaded Converter (I-M2C2) Topologies

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