Generalized Generator Model for Transformer Transfer Voltage Studies

Funabashi, Toshihisa; Ito, Tetsuo; Sugimoto, Toshirou; Miyagi, Katsunori; Sano, Takahiro; Ueda, Takeshi; Martínez, J.A.; Ametani, Akihiro

doi:10.1109/tec.2004.827713

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…the overvoltage in per unit. Doing so for the second result is shown in column three of Table I (16) or (17) Equation ( 17) can be rearranged to obtain (18) For example, for an overvoltage of 10% and, thus, :…”

Section: Table II Relation Of Pulse Rise Time and Minimum Cable Lengt...mentioning

confidence: 99%

“…Of course, such a formula can also be developed for other values of the reflection factor obtained depending on cable characteristics and measurements of generator surge impedances [18]. For a receiving-end reflection factor below 1, the derivation developed in the Appendix gives the rise time (19) IV.…”

Section: Table II Relation Of Pulse Rise Time and Minimum Cable Lengt...mentioning

confidence: 99%

“…2) Slope Equivalencing: As shown in Fig. 7, a key principle of the design lies in using the step response of the filter to approximate the ramp function with the rise time specified by (18). As part of the approximation, the initial slope of the response of the filter to a step of a PWM pulse with magnitude coming from the voltage-sourced converter is made to equal the slope of (1).…”

Section: B Parameter Selectionmentioning

confidence: 99%

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Transient Cable Overvoltage Calculation and Filter Design: Application to Onshore Converter Station for Hydrokinetic Energy Harvesting

Kuschke

Strunz

2013

IEEE Trans. Power Delivery

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The facilitation of maintenance of hydrokinetic energy conversion systems is supported by minimizing the exposure of components located underwater. The described onshore converter station's design was motivated by this thought. The station includes the functions of power-electronic ac-dc-ac conversion and connection to the electric grid, thus leaving only turbine, variable-frequency ac generator, and connecting ac cable exposed underwater. A challenge in this configuration are potential electromagnetic traveling waves on the ac cable. They can be triggered through power-electronic pulses and cause significant overvoltages at the generator side. A key contribution is the modification of existing mathematical equations resulting in a novel methodology for expressing the overvoltages as a function of the traveling time and steepness of the pulses. This serves as the basis for an overvoltage reduction method involving the targeted selection of parameters of a suitable filter. It is applicable to distributed tidal energy and instream river conversion and electric drive systems involving long ac cables. The resulting overall design is validated through electromagnetic transients simulation. The results substantiate the proposed methodology of analysis and design.

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Section: Table II Relation Of Pulse Rise Time and Minimum Cable Lengt...mentioning

confidence: 99%

Section: Table II Relation Of Pulse Rise Time and Minimum Cable Lengt...mentioning

confidence: 99%

Section: B Parameter Selectionmentioning

confidence: 99%

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