Power electronics and controls for wind turbine systems

Abstract

-The electrical energy consumption continues to grow and more applications will be based on electricity in the next decades. We can expect that more 60 % of all energy consumption will be converted and used as electricity. It is a demand that production, distribution and use of electrical energy are done as efficiently as possible. Further, emerging climate changes argues to find future solutions which also are sustainable. Two major technologies will play important roles to solve parts of those future problems. One is the change the electrical power production from conventional, fossil (and short term) based energy sources to renewable energy sources. Another is to use power electronics to achieve high efficiency in power generation, transmission/distribution and utilization. This paper discuss trends of the most promising renewable energy sources, wind energy, which ,integrated with power electronics, is changing the future electrical infrastructure and also contributes steadily to non-carbon based electricity production. The paper's focus is on the power electronics technologies used in wind turbine systems.

New Power Quality Indices for the Assessment of Waveform Distortions from 0 to 150 kHz in Power Systems with Renewable Generation and Modern Non-Linear Loads

“…In Figure 1b, a variable speed WT with a gearbox and a back-to-back partial scale static converter on the rotor circuit are visible. Moreover, while the stator windings are directly connected to the grid through the transformer, the rotor windings are also fed through a power electronics converter, whose rated power is about 30% of the generator power [22]. So, in this WTS configuration, the power electronics converter with a PWM carrier in the range of a few kHz is on the rotor side of an induction generator.…”

Aggregated models of permanent magnet synchronous generators wind farms

“…Specifically, the operational procedure P.O.12.3 sets the requirements of the wind systems response against voltage dips [33]. In variable speed PMSG WTs, the advantage of using a full scale power converter is the capacitor decoupling between the generator and the grid, what allows a full controllability of the system [34,35], and makes that the generator dynamic behaviour be not affected by grid faults.…”

Implementation of three-phase grid-connected inverter controlled with dSPACE DS1103

“…DC/DC converters are used as maximum power point tracker, voltage booster and battery charger/discharger in photovoltaic systems [2], [3]. AC/DC converters control the extracted power from wind turbine or regulate DC bus voltage [4]. Inverters are utilized between DC bus and grid or load depending on the system being ongrid or off-grid.…”