Common-mode voltage reduction modulation techniques for three-phase grid connected converters

Hou, Chung-Chuan; Shih, Chih-Chung; Chengt, Po-Tai; Hava, Ahmet M.

doi:10.1109/ipec.2010.5543223

Cited by 14 publications

(15 citation statements)

References 10 publications

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“…This proves to a certain degree -although based on advanced assumptions-that the equivalent noise source representing the converter behaviour is a-priori the signal on the switching devices sides chopped at the switching frequency F sw . This joins some endorsed previous models such as in [19,9].…”

Section: Mathematical Developmentsupporting

confidence: 87%

“…Hence, during designing and for an optimal manufacturing cost and size point of view, it is important to account for the ElectroMagnetic Compatibility (EMC) constraints. In addition, within modern multisource grids -as in photovoltaic systems -common mode (CM) current, mainly flowing inside shielding structures, may cause serious safety risks, dysfunctions, and saturation effects inside magnetic circuit of EMI filters [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Conducted Emission Prediction Within the Network Based on Switching Impedances and Emi Sources

Ales¹,

Belhadj²,

Zaoui³

et al. 2019

PIER B

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Since electromagnetic compatibility studies intend to predict the compliance with electromagnetic standards, an accurate computation of both common and differential mode conducted noises is necessary. Modern networks such as in automobiles that are known for supplying many electrical actuators -include many power converters and long cables (conductors) to efficiently manage power transfer. However, the presence of both converters and cables creates new electromagnetic compatibility issues. For example, the interaction between cables and converters becomes a noise source. For this reason electromagnetic compatibility study becomes more complex. Therefore, the purpose of this paper is an attempt to propose an analytical model that computes noise sources by generating conducted signals within the network at any site, meaning all along the cable according to the CISPR16 standard. Our approach primarily consists of modeling conducted noise sources generated by converters connected to the DC-network which are extracted and identified in both frequency and time domains. The electromagnetic compatibility modelling of converter's behaviour is performed by defining a mathematical switching function. The model is assessed with time domain simulations and identified by experimental measurements. Secondly, the extracted converter's model, based on equivalent noise sources, is used to predict the conducted noise inside a defined network at any location of the cable. The process of the network's modelling is realised through using the Multi-Transmission Line Method of lossless lines. This network's model is crucial for EMC analysis in order to evaluate the interaction degree between noise sources and cable parameters.

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Section: Mathematical Developmentsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Conducted Emission Prediction Within the Network Based on Switching Impedances and Emi Sources

Ales¹,

Belhadj²,

Zaoui³

et al. 2019

PIER B

View full text Add to dashboard Cite

show abstract

“…Thus, the simulation models as those shown in Fig. 10 are simple and sufficient for the study of basic leakage current, as demonstrated in [30].…”

Section: Leakage Current Characteristics Of the Tpvismentioning

confidence: 96%

Classification of Grid Connected Transformerless PV Inverters with a Focus on the Leakage Current Characteristics and Extension of Topology Families

Özkan¹,

Hava²

2015

Journal of Power Electronics

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Grid-connected transformerless photovoltaic (PV) inverters (TPVIs) are increasingly dominating the market due to their higher efficiency, lower cost, lighter weight, and reduced size when compared to their transformer based counterparts. However, due to the lack of galvanic isolation in the low voltage grid interconnections of these inverters, the PV systems become vulnerable to leakage currents flowing through the grounded star point of the distribution transformer, the earth, and the distributed parasitic capacitance of the PV modules. These leakage currents are prohibitive, since they constitute an issue for safety, reliability, protection coordination, electromagnetic compatibility, and module lifetime. This paper investigates a wide range of multi-kW range power rating TPVI topologies and classifies them in terms of their leakage current attributes. This systematic classification places most topologies under a small number of classes with basic leakage current attributes. Thus, understanding and evaluating these topologies becomes an easy task. In addition, based on these observations, new topologies with reduced leakage current characteristics are proposed in this paper. Furthermore, the important efficiency and cost determining characteristics of converters are studied to allow design engineers to include cost and efficiency as deciding factors in selecting a converter topology for PV applications.

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“…The DPWM is successfully used in conventional two-level inverters [7][8][9][10][11][12][13][14]. If different phases are clamped to different voltage levels at different angles of the reference vector, different types of DPWM will be obtained.…”

Section: Introductionmentioning

confidence: 99%

Triangle Carrier-Based DPWM for Three-Level NPC Inverters

Wei

Xie

et al. 2018

IEEE J. Emerg. Sel. Topics Power Electron.

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This paper proposes a triangle carrier based discontinuous PWM (TCB-DPWM) implement method for threelevel neutral-point-clamped (3L-NPC) inverters. The function equivalent relationship of proposed TCB-DPWM and space vector based discontinuous PWM (SVB-DPWM) is mathematically analyzed in this paper. The proposed TCB-DPWM method effectively simplified the implementation of the SVB-DPWM by injecting twice common mode voltages (CMVs) to original modulation signals, where different DPWM methods can be easily obtained in a unified scheme by setting different values of proportional allocation factor for small vectors in different sectors. In addition, a TCB-DPWM based neutral point voltage balancing method is investigated to demonstrate its application. The polarity of the CMV injection is regulated according to the polarity of the proportional allocation factor to realize the neutral point voltage balancing. Finally, the proposed TCB-DPWM and neutral point voltage balancing method are both verified by simulation and experimental results. The results show that the proposed TCB-DPWM can effectively simplify the implementation of modulation and improve system efficiency. Index Terms-Three-level neutral-point-clamped inverter, voltage source inverter, discontinuous PWM, neutral point voltage balancing.

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Common-mode voltage reduction modulation techniques for three-phase grid connected converters

Cited by 14 publications

References 10 publications

Conducted Emission Prediction Within the Network Based on Switching Impedances and Emi Sources

Conducted Emission Prediction Within the Network Based on Switching Impedances and Emi Sources

Classification of Grid Connected Transformerless PV Inverters with a Focus on the Leakage Current Characteristics and Extension of Topology Families

Triangle Carrier-Based DPWM for Three-Level NPC Inverters

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