Analysis of common mode voltage-"neutral shift" in medium voltage PWM adjustable speed drive (MV-ASD) systems

Rendusara, D.; Cengelci, E.; Enjeti, P.N.; Stefanovic, Victor R.; Gray, W.

doi:10.1109/pesc.1999.785623

Cited by 19 publications

(17 citation statements)

References 14 publications

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“…The pole-to-pole MVDC voltage is assumed to fixed by the HVDC station at 60 kV with each pole 30 kV to either side of ground. C cm is taken to be 100 nF based on [20] and [21]. Acceptable voltage and current ripples are specified as ripple factors, where an RF of 0.1 would correspond to a ripple of +/-10% of the DC value.…”

Section: Design Examplementioning

confidence: 99%

A new wind turbine interface to MVDC grid with high frequency isolation and input current shaping

Daniel

Krishnamoorthy

Enjeti

2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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This work introduces a new approach using high frequency (HF) isolation for interfacing next-generation offshore wind turbine generators (WTGs) to medium voltage DC (MVDC) collection grids, a necessity for the continued development of offshore wind resources as farms are sited further out to sea. Initial analysis of the proposed approach is provided, as well as a practical design example for reproduction of results and prototype design guidance for further development of the concept. Detailed simulation results demonstrate converter operation from full rated power down to 25% rated power. The WTG displacement power factor is found to be 0.95 leading. Simulation results further confirm near-sinusoidal WTG and transformer current, continuous output current, and stiff DC link voltage, all within specified ripple tolerances.

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Section: Design Examplementioning

confidence: 99%

A new wind turbine interface to MVDC grid with high frequency isolation and input current shaping

Daniel

Krishnamoorthy

Enjeti

2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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“…16) drives CM current and requirements can be met without L cm4 . L cm3 is selected to keep the motor CM current <0.1A, assuming that the motor capacitance to ground is 0.01 to 0.1 nF/Hp [19] [20]. The CM voltages are generated by a simulation and reflected into the networks of Fig.…”

Section: B Differential Mode Fiter Designmentioning

confidence: 99%

Power density and efficiency of system compatible, sine-wave input/output drives

Cuzner¹,

Drews²,

Venkataramanan

2012

2012 IEEE Energy Conversion Congress and Exposition (ECCE)

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The benefits of Variable Frequency Drives (VFDs) have not been fully realized in many applications because they compete in the power density of legacy equipment, such as electro-mechanical motor controllers. This is especially the case in Navy shipboard systems where sensitive equipment is in close proximity to VFDs. In this context, this paper compares the power densities, efficiencies and costs of a Voltage Source Converter (VSC), Current Source Converter (CSC) and mixed VSC/CSC based VFDs. A meaningful comparison is made based upon an actual hardware implementation that meets stringent power quality and electromagnetic compatibility (EMC) requirements. Hardware results of a CSC/VSC based VFD are provided in order to support the findings of the study. Special consideration is given to operation at light loads.

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“…For example, voltages and generate the same vector, but the second set of voltages is clearly unbalanced ( ). The common-mode voltage is defined as [1], [4] (4)…”

Section: Common-mode Voltage Generation In Vector Modulation Schmentioning

confidence: 99%

“…It has been shown that in mediumvoltage adjustable-speed drive applications, which are associated with critical processes, the common-mode voltage is an important issue to consider [2], [4].…”

Section: Introductionmentioning

confidence: 99%

“…These current spikes can cause premature motor bearings failures and electromagnetic interference (EMI) [3]. Some solutions are based on additional hardware, like filters [2], [5], and other methods based on more advanced modulation strategies which avoid the generation of common-mode voltages are applicable in the area of multilevel inverters [4], [6]. However, these methods work with high switching frequency.…”

Section: Introductionmentioning

confidence: 99%

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A New Modulation Method to Reduce Common-Mode Voltages in Multilevel Inverters

Rodríguez

Pontt

Correa

et al. 2004

IEEE Trans. Ind. Electron.

144

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This paper proposes a new modulation strategy for multilevel inverters, which selects voltage vectors that generate zero common-mode voltage in the load, working at low switching frequency. Experimental results confirm that the method is highly effective and simple to implement in a modern microprocessor. The voltage distortion (total harmonic distortion), the number of commutations, and the linearity are also studied. Finally, it is concluded that the proposed strategy is highly suited for inverters with a high number of levels.Index Terms-Common-mode voltage, multilevel converter, multilevel inverter, space vector.

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Analysis of common mode voltage-"neutral shift" in medium voltage PWM adjustable speed drive (MV-ASD) systems

Cited by 19 publications

References 14 publications

A new wind turbine interface to MVDC grid with high frequency isolation and input current shaping

A new wind turbine interface to MVDC grid with high frequency isolation and input current shaping

Power density and efficiency of system compatible, sine-wave input/output drives

A New Modulation Method to Reduce Common-Mode Voltages in Multilevel Inverters

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