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This paper presents the converter design for a 20kW wind turbine generator. The converter consists of a phase controlled rectifier and a DC/DC boost converter. The rectifier makes the generator AC voltage match the DC voltage while the boost converter keeps the DC voltage constant. POWER FLOW DIAGRAM The power flow diagram for the 20kW wind generator system is shown in Figure 1. The wind drives the wind turbine, which is connected to the wind generator, therefore the wind energy is converted to electrical energy. The wind generator is a three phase brushless permanent magnet machine so the airgap flux ? can be assumed to be constant. CONVERTER DESIGN In order to make the generator’s AC voltage match the DC voltage, there are a few options. Firstly, the stator of the generator is delta connected while the AC/DC converter is composed of a three phase uncontrolled rectifier and a boost converter [1]. Another solution is that the stator of the generator remains star connected, while the converter employs a phase-controlled rectifier and a boost converter. Phase-Controlled Rectifier, DC/DC Boost Converter, The primary side of the boost converter is connected to the turbine generator via the rectifier. The ripple in I 1, which introduces power loss in the generator, could be high, e.g., if the current ripple is 10% of the DC current, the copper loss is 1% of the main copper loss, which is only a small part of the power loss.
Tags:wind turbine generator, ac dc converter, permanent magnet, wind generator, dc voltage
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