Low-Frequency Ripple Suppression for Medium-Voltage Drives Using Modular Multilevel Converter With Full-Bridge Submodules

He, Liqun; Zhang, Kai; Xiong, Jian; Fan, Shengfang; Xue, Yaosuo

doi:10.1109/jestpe.2015.2477433

Cited by 79 publications

(23 citation statements)

References 18 publications

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“…As shown in Figure 2, the upper two circuits are the d-axis equivalent circuits, which are built based on Equations (24) and (26). The lower two circuits are q-axis equivalent circuits, which are built based on Equations (25) and (27). In addition, Equations (24) and (25) describe the relationship between PMSG and MMC.…”

Section: Modelling Of MMC Connected To the Pmsg-based Wecsmentioning

confidence: 99%

“…In addition, Equations (24) and (25) describe the relationship between PMSG and MMC. Equations (26) and (27) represent the relationship between 2nd common-mode voltages and circulating currents in MMC.…”

Section: Modelling Of MMC Connected To the Pmsg-based Wecsmentioning

confidence: 99%

“…Equations (24)- (27) show the mathematical model of the MMC connected to PMSG, in which R s and R eq represent the losses of PMSG and MMC respectively. The mechanical power of PMSG and dc-side power of MMC have the following relationship:…”

Section: Calculation Of the Dc-side Currentmentioning

confidence: 99%

“…The large capacitor voltage ripple may lead to IGBT breakdown and reduce the system reliability. Therefore, for the MMC applied in motor drive, the circulating current injection methods are usually used to suppress the capacitor voltage ripple at start-up and low-frequency operations [25,27].…”

Section: Analysis Of Capacitor Voltage Ripple In the MMC Connected Tomentioning

confidence: 99%

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A Steady-State Analysis Method for Modular Multilevel Converters Connected to Permanent Magnet Synchronous Generator-Based Wind Energy Conversion Systems

Liu

Sun

et al. 2018

Energies

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Modular multilevel converters (MMCs) have shown great potential in the area of multimegawatt wind energy conversion system (WECS) based on permanent magnet synchronous generators (PMSGs). However, the studies in this area are few, and most of them refer to the MMC used in high-voltage direct current (HVDC) systems, and hence the characteristics of the PMSG are not considered. This paper proposes a steady-state analysis method for MMCs connected to a PMSG-based WECS. In the proposed method, only the wind speed (operating condition) is required as input, and all the electrical quantities in the MMC, including the amplitudes, phase angles and their harmonics, can be calculated step by step. The analysis method is built on the proposed d-q frame mathematical model. Interactions of electrical quantities between the MMC and PMSG are comprehensively considered. Moreover, a new way to calculate the average switching functions are adopted in order to improve the accuracy of the analysis method. Applications of the proposed method are also presented, which includes the characteristic analysis of capacitor voltage ripples and the capacitor sizing. Finally, the accuracy of the method and the correctness of the analysis are verified by simulations and experiments.Energies 2018, 11, 461 2 of 31 require a large amount of series or parallel connected power devices in order to achieve the required power, which reduces the reliability of WECS. Moreover, the traditional converters are not suitable for medium-voltage (3-33 kV) WECS, which is becoming popular for turbine power ratings greater than 3.0 MW [6,7]. These drawbacks lead to the studies of new full-scale power converters.The modular multilevel converter (MMC), which became the most common type of voltage-source converter used in the high-voltage direct current (HVDC) applications, is also a suitable converter for PMSG-based WECS. In [8,9], MMC was used for medium-voltage motor drives, which opened up the study of MMC applied to variable-speed machines. The application of MMCs in PMSG-based WECS was first studied in [10]. That paper concluded that MMC should be considered a suitable option for transformerless 10 MW PMSG-based WECS, and performs well in the full system. In [11], the authors proposed an improved online fault identification scheme for the MMC applied to WECS, which avoided the use of extra sensors by only using the already available variables in detection, and therefore the maintenance cost of the distant offshore wind farms can be reduced. In [12], the complete control scheme of MMC applied to the PMSG-based WECS was proposed. Low voltage ride-through problems and capacitor voltage ripple problems were also studied in that paper. In addition, the increasing interest in all-dc wind farms, in recent years, will also enlarge the application of MMC in WECS [13][14][15].Steady-state analysis can be used for component sizing and assessment of the impact of different parameters on the MMC performance. However, there is no reference available for the steady-state anal...

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Section: Modelling Of MMC Connected To the Pmsg-based Wecsmentioning

confidence: 99%

Section: Modelling Of MMC Connected To the Pmsg-based Wecsmentioning

confidence: 99%

Section: Calculation Of the Dc-side Currentmentioning

confidence: 99%

Section: Analysis Of Capacitor Voltage Ripple In the MMC Connected Tomentioning

confidence: 99%

See 2 more Smart Citations

A Steady-State Analysis Method for Modular Multilevel Converters Connected to Permanent Magnet Synchronous Generator-Based Wind Energy Conversion Systems

Liu

Sun

et al. 2018

Energies

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“…In both schemes, a high-frequency voltage is introduced into the sub-arms, which excites a high-frequency current in the additional cross-connected path to create one degree of freedom for power redistribution between both the upper and lower arms. Other configurations address MMC low-frequency operation by employing full-bridge SMs instead of the HB-SMs [33], suggesting an MMC-based Hexverter topology for energy-balance control [34], combining the conventional MMC configuration with a series switch to the dc input source to reduce the average dc components in the arm voltages by disconnection of the dc source at regular intervals [35], and connecting the capacitors of the top SMs and the bottom SMs via two accessorial cables, while connecting the upper and lower arms through a central SM [36].…”

mentioning

confidence: 99%

A Dual Modular Multilevel Converter With High-Frequency Magnetic Links Between Submodules for MV Open-End Stator Winding Machine Drives

Diab

Massoud

Ahmed

et al. 2018

IEEE Trans. Power Electron.

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Active Cross-Connected Modular Multilevel Converters

2018

Modular Multilevel Converters: Analysis, Control, and Applications

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Low-Frequency Ripple Suppression for Medium-Voltage Drives Using Modular Multilevel Converter With Full-Bridge Submodules

Cited by 79 publications

References 18 publications

A Steady-State Analysis Method for Modular Multilevel Converters Connected to Permanent Magnet Synchronous Generator-Based Wind Energy Conversion Systems

A Steady-State Analysis Method for Modular Multilevel Converters Connected to Permanent Magnet Synchronous Generator-Based Wind Energy Conversion Systems

A Dual Modular Multilevel Converter With High-Frequency Magnetic Links Between Submodules for MV Open-End Stator Winding Machine Drives

Active Cross-Connected Modular Multilevel Converters

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