Space Vector Modulation for DC-Link Current Ripple Reduction in Back-to-Back Current-Source Converters for Microgrid Applications

The pulse-width-modulated (PWM) current-source converters (CSCs) fed electric machine systems can be considered as a type of high reliability energy conversion systems, since they work with the long-life DC-link inductor and offer high fault-tolerant capability for short-circuit faults. Besides, they provide motor friendly waveforms and four-quadrant operation ability. Therefore, they are suitable for high-power applications of fans, pumps, compressors and wind power generation. The purpose of this paper is to comprehensively review recent developments of key technologies on modulation and control of high-power (HP) PWM-CSC fed electric machines systems, including reduction of low-order current harmonics, suppression of inductor-capacitor (LC) resonance, mitigation of common-mode voltage (CMV) and control of modular PWM-CSC fed systems. In particular, recent work on the overlapping effects during commutation, LC resonance suppression under fault-tolerant operation and collaboration of modular PMW-CSCs are described. Both theoretical analysis and some results in simulations and experiments are presented. Finally, a brief discussion regarding the future trend of the HP CSC fed electric machines systems is presented. Index Terms-Current source converter (CSC), high power (HP) applications, electric machine system, inductor-capacitor (LC) resonance, low-order current harmonics, common-mode voltage (CMV), modulation, control.

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“…Configuration of the grid-connected CSC system [41]. torque ripple and even system instability [46]. As shown in Fig.…”

Section: A Modular Cscs Fed Systemsmentioning

confidence: 99%

Recent developments of modulation and control for high-power current-source-converters fed electric machine systems

Liu

Wang

Wei³

et al. 2020

Trans. Electr. Mach. Syst.

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“…There have been several studies done to reduce the ripple current of the DC-link capacitor in systems using DPWM. Several works [24][25][26] found a novel DPWM algorithm for the back-to-back converter. In addition, Zhang et al [27] introduced the carrier interleaving method between two paralleled VSIs.…”

Section: Introductionmentioning

confidence: 99%

DC-link Ripple Reduction in a DPWM-Based Two-Level VSI

et al. 2018

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This paper proposes a new method to reduce the ripple current of the DC-link capacitor in a two-level voltage source inverter (VSI), with a discontinuous pulse-width modulation (DPWM). In real applications, a capacitor block is very bulky, due to the parallel connection of several capacitors that share the value of the ripple current. Hence, it contributes significantly to the volume and weight of the whole system. Conventional DPWM is used to minimize the amount of switching for the power transistors, therefore, reducing stress and power loss. This leads to increased efficiency and reliability of the system. Nevertheless, the reduction of the DC link ripple current is still not optimal. Therefore, the proposed method introduces a PWM phase-shift technique to provide further reduction of the DC-link ripple current in a DPWM-based VSI. The efficacy of the proposed method is confirmed by simulation and experimental results.

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“…This has greatly limited of full deployment of DERs. For the sake of coordinating the conflict between the main grid and DERs, fully exploiting the potential of DERs and promoting larger scale of application of DER technology, the notion of "micro-grid" has been advocated [3,4]. There are two kinds of operation modes that can be applied in a micro-grid.…”

Section: Introductionmentioning

confidence: 99%

A Novel Hierarchical Control Strategy for Low-Voltage Islanded Microgrids Based on the Concept of Cyber Physical System

et al. 2018

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Based on the concept of cyber physical system (CPS), a novel hierarchical control strategy for islanded microgrids is proposed in this paper. The control structure consists of physical and cyber layers. It’s used to improve the control effect on the output voltages and frequency by droop control of distributed energy resources (DERs), share the reactive power among DERs more reasonably and solve the problem of circumfluence in microgrids. The specific designs are as follows: to improve the control effect on voltages and frequency of DERs, an event-trigger mechanism is designed in the physical layer. When the trigger conditions in the mechanism aren’t met, only the droop control (i.e., primary control) is used in the controlled system. Otherwise, a virtual leader-following consensus control method is used in the cyber layer to accomplish the secondary control on DERs; to share the reactive power reasonably, a method of double virtual impedance is designed in the physical layer to adjust the output reactive power of DERs; to suppress circumfluence, a method combined with consensus control without leader and sliding mode control (SMC) is used in the cyber layer. Finally, the effectiveness of the proposed hierarchical control strategy is confirmed by simulation results.

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Space Vector Modulation for DC-Link Current Ripple Reduction in Back-to-Back Current-Source Converters for Microgrid Applications

Cited by 95 publications

References 16 publications

Recent developments of modulation and control for high-power current-source-converters fed electric machine systems

Recent developments of modulation and control for high-power current-source-converters fed electric machine systems

DC-link Ripple Reduction in a DPWM-Based Two-Level VSI

A Novel Hierarchical Control Strategy for Low-Voltage Islanded Microgrids Based on the Concept of Cyber Physical System

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