An All-DC Offshore Wind Farm With Series-Connected Turbines: An Alternative to the Classical Parallel AC Model?

Torque Ripple Reduction in a DFIG-DC System by Resonant Current Controllers

“…A connection to a common dc grid with a voltage of few kVs is adequate for low power systems. For higher power systems, a dc-dc converter with a high-frequency insulating transformer can be used in order to boost the voltage to higher values [16].…”

“…This value of K r is set in order to have a phase shift less than 3 deg in the closed loop transfer function. The resulting cross-over frequency of the current loop and the phase margin calculated by (16) are 344 Hz and 51.3 deg respectively, whereas the gain and the phase of the closed loop transfer function at ω=ω 0 are 1.006 p.u. and 2.86 deg respectively, which confirm the good tracking capability for the harmonic reference signals at the resonance frequency.…”

Reduction of Output Common Mode Voltage Using a Novel SVM Implementation in Matrix Converters for Improved Motor Lifetime

“…Since no intermediate reactive devices are required, a MC allows for a very compact design. In addition to these advantages, its low cost and high power density have made MC an attractive solution for special applications such as compact drives, drives in hostile environments, military applications [37], aerospace [38], and renewable energy [39][40][41].…”

A Scheme for the Power Control in a DFIG Connected to a DC Bus via a Diode Rectifier

“…This layout is interesting for distributed generation systems [25]- [26] and dc micro-grids [27]- [28], where wind turbines, solar panels, bio-fuel, as well as storage systems could be effectively integrated by means of a common dc-bus. A dc input is also suitable to feed the dc-ac converter and the medium frequency boost transformer in high voltage dc transmission lines [29]- [30].…”