SVPWM Strategies for Three-level T-type Neutral-point-clamped Indirect Matrix Converter

Nguyen Dinh Tuyen,Le Minh Phuong,이홍희 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4

In this paper, the three-level T-type neutral-point-clamped indirect matrix converter topology and the relative space vectormodulation methods are introduced to improve the voltage transfer ratio and output voltage performance. The presentedconverter topology is based on combinations of cascaded-rectifier and three-level T-type neutral-point-clamp inverter. It canovercome the limitation of voltage transfer ratio of the conventional matrix converter and the high voltage rating of powerswitches of conventional matrix converter. Two SVPWM strategies for proposed converter are described in this paper to achievethe advantages features such as: sinusoidal input/output currents and three-level output voltage waveforms. Results from Psim9.0 software simulation are provided to confirm the theoretical analysis. Hence, a laboratory prototype was implemented, and theexperimental results are shown to validate the simulation results and to verify the effectiveness of the proposed topology andmodulation strategies.

SVPWM Strategies for Three-level T-type Neutral-point-clamped Indirect Matrix Converter

Tuyen, Nguyen Dinh,Phuong, Le Minh,Lee, Hong-Hee The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4

In this paper, the three-level T-type neutral-point-clamped indirect matrix converter topology and the relative space vector modulation methods are introduced to improve the voltage transfer ratio and output voltage performance. The presented converter topology is based on combinations of cascaded-rectifier and three-level T-type neutral-point-clamp inverter. It can overcome the limitation of voltage transfer ratio of the conventional matrix converter and the high voltage rating of power switches of conventional matrix converter. Two SVPWM strategies for proposed converter are described in this paper to achieve the advantages features such as: sinusoidal input/output currents and three-level output voltage waveforms. Results from Psim 9.0 software simulation are provided to confirm the theoretical analysis. Hence, a laboratory prototype was implemented, and the experimental results are shown to validate the simulation results and to verify the effectiveness of the proposed topology and modulation strategies.

A New Study on Indirect Vector AC Current Control Method Using a Matrix Converter Fed Induction Motor

Lee Hong-Hee,Nguyen Hoang M. The Korean Institute of Power Electronics 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.1

This paper introduces two different types of AC current control methods for an indirect vector controlled induction motor using a matrix converter. The proposed methods combine the advantages of matrix converters with the advantages of the indirect vector AC current control methods. The first proposed method explains the basic idea of the hysteresis current control method for matrix converters and shows its capability and stability in comparison to the conventional method usually used for VSI. With the aid of the special configuration of the matrix converter, we also propose another current method which is modified from the first one in order to reduce both current ripple and torque ripple. Simulation results have verified the feasibility and the effectiveness of the proposed methods.

Improved Modulated Model Predictive Control of TLIMC-PMSM Based on Virtual Vector Prediction

Liu Ke,Cheng Qiming 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3

In order to solve the problems of traditional modulated model predictive control (M2PC) in three-level indirect matrix converter-permanent magnet synchronous motor (TLIMC-PMSM) system, such as inaccurate sector selection and duty ratio calculation of M2PC. An improved modulated model predictive control based on virtual vector prediction (VVP-M2PC) is proposed and applied to TLIMC-PMSM system. Compared with the traditional M2PC, VVP-M2PC re-partitions the sectors of the three-level inverter stage and constructs a new virtual vector to reduce the current control error. In addition, the feasibility of this method is discussed from two aspects: computational complexity and theoretical error analysis. Finally, compared with MPC and traditional M2PC, the simulation and experiment results show that the algorithm can improve the speed and torque ripple of PMSM, and improve the quality and robustness of input and output waveforms of the system.

Analytical loss model of series-resonant indirect-matrix-type power electronics transformers using MOSFETs

Hu, Yujie,Li, Zixin,Zhao, Cong,Li, Yaohua The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.11

A MOSFET-based series-resonant indirect-matrix-type power electronic transformer (PET) consists of line-frequency-switching folding-unfolding bridges and series-resonant dc-dc converters (SRCs), which is an attractive choice to achieve ac-ac conversion due to its high efficiency and high power density. However, the conduction losses, switching losses, and core losses in each of the high-frequency switching cycles T_s are different due to the pulsating dc voltage |ac|, which introduces difficulties in the calculation of losses. In addition, the small dc capacitors also participate in the resonance, and the resonant current shape deviates from a pure sine. Therefore, the conventional loss model is not suitable for PETs. In this paper, the time-domain analysis of SRC resonant current considering the dc capacitor is developed. Then, the analytical expression of the resonant current RMS value in grid cycle T_g is derived, which is more accurate in calculating conduction loss than the conventional model. In addition, it avoids the calculating losses in each T_s. Next, an analytical switching loss model is developed based on the curve fitting of the capacitance-voltage relationship. A simplified analytical core loss model is provided. Each part of the loss of the PET is verified by thermal simulations, and the total losses are verified by efficiency tests on an experiment prototype.

Advanced model predictive current control for induction motor drive system fed by indirect matrix converter

Mei, Yang,Yi, Gao The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.2

To decrease both the number and tuning difficulty of weighting factors, an advanced model predictive current control is proposed for an induction motor drive system fed by an indirect matrix converter, where the input and output currents of the indirect matrix converter are designated as control objectives. The reference input currents are established on the basis of the instantaneous power theory and optimized using a low-pass filter. In addition, the reference output currents are determined using a reference flux vector based on the deadbeat theory. As a result, there is only one weighting factor for parameter tuning, and the predictive models are significantly simplified. In addition, both the phase and the quality of the input currents are considered and controlled, which can improve the grid power quality. Simulation and experimental results show that the sinusoidal grid/output currents, a unity power factor, and good steady-state and dynamic performances of the induction motor have been achieved. In addition, the execution time of the entire algorithm was noticeably shortened.

매트릭스 컨버터 토폴로지를 이용한 직류전동기 속도제어

정범동 해양환경안전학회 2018 海洋環境安全學會誌 Vol.24 No.2

This paper proposes the applicability of matrix converter topology for the speed control of direct current motors. Matrix convertesr are divided into direct and indirect components. This paper utilizes an indirect matrix converter which is expected to be used widely because of making a variety of output side. The proposed converter has advantages which improves input current shape, has no large energy storage component causing short life. Simulation results are provided to verify effectiveness by comparing and analyzing features of the proposed and conventional topology. The proposed method shows similar performance for speed control, torque control, and load current control compared to a conventional method. Furthermore Harmonics are greatly reduced because the input current is controlled in a manner similar to sinusoidal wave by directly controlling switches at the rectifier stage. 본 논문은 직류전동기 속도제어를 위해 매트릭스 컨버터의 적용 가능성을 제안한다. 매트릭스 컨버터는 크게 직접 매트릭스 컨버터와 간접 매트릭스 컨버터로 나뉘는데 본 논문에서는 다양한 출력 단을 구성할 수 있어 향후 많은 활용이 예상되는 간접 매트릭스 컨버터를 이용하였다. 제안한 방식은 기존의 방식보다 입력 전류의 파형을 개선하고, 부피가 크고 비용이 많이 들며 수명단축의 원인이 되는 에너지 저장 요소를 가지지 않는 이점이 있다. 시뮬레이션을 통하여 기존 방식과 본 논문에서 제안하는 방식의 특징을 비교 분석하여 제안한 방식의 유효성을 입증하였다. 속도제어, 토크제어, 부하전류제어에서는 유사한 성능을 보이며, 입력전류는 정류단의 스위치를 직접 제어함으로써 정현파와 유사하게 제어되기 때문에 고조파가 크게 감소되었다.

Fault diagnosis for indirect matrix converter based on mixed logical dynamical model

Wang Rutian,Shen Jiuyang,Zhong Zhefu,Yu Hao 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4

This paper proposes a fault diagnosis method based on the mixed logic dynamic (MLD) model for the indirect matrix converter (IMC), which can improve the real-time and accuracy of fault diagnosis. Firstly, the MLD model of IMC is built, and the state residual equation is constructed. Then, the characteristics of the state residuals and the variation trend of the DC bus voltage when the IMC power switch fails are analyzed in detail. Based on the above, the corresponding relationship between the inverter fault switch and the state residual was established. Combined with the characteristics of space vector modulation strategy, the trend percentage function was defi ned to determine the matching DC bus voltage variation trend in diff erent rectifi er sections. By detecting the change of the state residual and the trend percentage function, fault detection and localization can be realized. Finally, the simulation and experimental results verify the feasibility and eff ectiveness of the proposed method

71% Common‑mode voltage suppression modulation strategy for indirect matrix converters

Shanhu Li,Zijing Lu,Sunpeng Cao,Xu Liu,Zhaoyang Jin,Weitao Deng 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.2

Common-mode voltage (CMV) with a high amplitude and frequency is generated when an indirect matrix converter (IMC) is operating, which damages the motor winding insulation and accelerates motor aging. Existing IMC modulation methods can only suppress the CMV by 42.3%. However, this paper proposes a modulation strategy with a 71% reduction in the peak CMV. The proposed method selects active vectors based on the characteristics of the CMV amplitude under each of the active vectors. The rectifier stage selects two active vectors within each modulation sector. According to the sector where the input reference current vector is located, the inverter stage chooses active-voltage vectors whose corresponding peak CMV is 1/3 the minimum peak line voltage for modulation. Moreover, the CMV spikes caused by the dead zone effect are eliminated by reasonably arranging the switching sequence of the voltage vectors in the inverter stage. The proposed approach considerably lowers the peak CMV and has a good suppression effect on the amplitude of high-frequency CMV. Finally, experimental results illustrate the CMV reduction efficiency of the modulation strategy.

A SVM Method for Five-leg Indirect Matrix Converters with Open-End Winding Load

Quoc-Hoan Tran,Tuyen D. Nguyen,Hong-Hee Lee 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

This paper presents a new space vector modulation (SVM) method for a three-phase five-leg indirect matrix converter (IMC) to drive a three-phase open-end winding load. The inverter stage of the new IMC topology is composed of five legs instead of the conventional six legs for the three-phase open-end winding load applications. The SVM method to drive the five-leg IMC is developed to operate the inverter stage as two independent three-phase inverters with five legs. The proposed configuration has the advantages such as sinusoidal input/output current waveforms, ability to boost voltage transfer ratio up to 1.5, and zero common-mode voltage across the open-end phase windings; its performance is not deteriorated compared to that of the six-leg inverter in spite of the reduced leg. Simulated results are presented to verify the effectiveness of the proposed topology and its SVM method.