An Application of Wind Turbine Generator on Hybrid Power Conditioner to Improve Power Quality

摘要

This article applies wind turbine generator by the Salient Permanent Magnet Synchronous Generator (PMSG) for compensation low voltage distribution power system. The wind turbine generator combining with a dynamic voltage restorer (DVR) in order to compensate the voltage variation in the electrical power system. The proposed system consists of wind energy system whose maximum power is equal to 5 kWp. The electrical energy form wind turbine system supplies the DVR, which is controlled by four-wire bidirectional boost converter for regulating the DC link voltage at 440 V. While, the D VR consists of three-level neutral point clamped (NPC) inverter. The control system of the DVR is based on In-phase compensation technique, which controls the NPC inverter producing the sinusoidal voltage. The compensated voltage variation is inversely proportional to source voltage and injected voltage, the power source voltage of parallel transformer (output voltage 0.5 per unit (pu.)) though the series transformer (producing injected voltage 0.5 per unit (pu.)), adding with the output load voltage 1.0 per unit (pu.). Of this principle will result the system that can deliver electrical power of 50 percentage of normal voltage condition, and one hundred percent during a power outage. The prototype DVR is built and tested in laboratory. In the test cases, the depletion of power quality is monitored both in unbalanced voltage sags / interruption cases. The data collected by MATLAB simulation are used in comparison with the experimental results. This provides guideline to further analyze and improve power conditioning in electrical system pertinent to wind turbine generator.