A variable speed wind energy conversion system connected to the grid for small wind generator

Abstract

The wind energy system presented in this paper uses a permanent magnet generator connected to a threephase semi-controlled rectifier. Although an acceptable THD and power factor result, the proposed converter is simple, cheaper, and robust. Additionally, a single-phase PWM inverter is also employed in the grid connection. The inverter uses a double hysteresis in the control of the current injected in the grid, what implies reduced switching losses. Analysis and partial experimental results are presented for a 5 kW prototype. At the final version of this paper, a more detailed theoretical analysis, simulation results, as well as experimental results at rated power are supposed to be presented.

On Reducing the Shaft Torque Ripple of Small-to-Medium-Scale Wind Energy Conversion Systems Using Multi-Pulse Autotransformer Rectifier

“…For small-to-medium-scale WECS, sensorless control is always preferred for reducing the overall cost. A commonly adopted way to achieve this is to implement the so called phase-locked-loop (PLL) technique to estimate the rotor speed through electrical variables [24][25][26]. It is effective and can also be adopted here.…”

Current control system to PMSG in overmodulation region

“…Permanent magnet synchronous generators (PMSG) have received great attention in wind generation systems in recent years [1][2][3]. The main advantages of these generators are: reduction in the assembly, maintenance and operation cost, high efficiency and reduced weight and volume compared to others generators.…”

Some Basic Issues and Applications of Switch-Mode Rectifiers on Motor Drives and Electric Vehicle Chargers

“…The robust cancellation weighting factor is automatically tuned according to load level to yield compromised voltage and power quality control performances. Similar to single-phase bridgeless SMRs (Zhang et al, 2000;Youssef et al, 2008), there were also some researches being emphasized on the development of three phase bridgeless SMRs (Reis et al, 2008;Oliverira et al, 2009). In (Wang, 2010), a bridgeless DCM three phase SMR is developed and used as a front-end AC-DC converter for the SRM drive.…”

“…3(b) (Reis et al, 2008;Oliverira et al, 2009), the SMR uses three diodes and three switches rather than using diode bridge rectifier. Obviously, one diode drop is www.intechopen.com Some Basic Issues and Applications of Switch-Mode Rectifiers on Motor Drives and Electric Vehicle Chargers 259 eliminated in each line-current path resulting to increase the efficiency compared to singleswitch SMR.…”