Abstract
In order to broaden the limited utilization range of wind power and improve the charging and discharging control performance of the storage battery in traditional small wind power generation systems, a wind power system based on a vertical-axis off-grid induction generator is proposed in this paper. The induction generator not only can run in a wide wind speed range but can also assist the vertical-axis wind turbine to realize self-starting at low wind speed. Combined with the maximum power point tracking method, the slip frequency control strategy is employed to regulate the pulse width modulation (PWM) converter to control the output power of the proposed system when the wind speed and load change. The charge and discharge of the storage battery is realized by the segmented current-limiting control strategy by means of an electric power unloader device connected to the DC bus. All these implement a balanced and stable operation of the proposed power generation system. The experimental research on the 5.5 kW prototype system is developed, and the corresponding results verify the correctness and feasibility of the system design and control strategy. Some comparison experiments with a magnetic suspension permanent magnet synchronous generator (PMSG) demonstrate the application prospect of the proposed vertical-axis off-grid induction generator wind power system.
Highlights
As a clean renewable energy source, wind power has seen a rapid development in the 21st century, thanks to its several inherent advantages including its vast quantity, wide regional distribution and zero pollution
The propeller-type horizontal axis wind turbine is the mainstream of large-scale commercial wind power generations, since it meets industrial requirements and its efficiency is much higher than traditional vertical axis wind turbines (VAWTs)
When the output power of SCIG is less than the required load power, the electric power disconnected from the DC bus, and the storage battery begins to discharge if it has enough energy to unloader device is disconnected from the DC bus, and the storage battery begins to discharge if it transfer to the DC bus
Summary
As a clean renewable energy source, wind power has seen a rapid development in the 21st century, thanks to its several inherent advantages including its vast quantity, wide regional distribution and zero pollution. The traditional structure of the uncontrolled rectifier plus DC–DC converter employed in PMSG systems resulted in only one controllable component being used when the maximum power point tracking, the energy storage controlling of the battery, and required load power following are realized simultaneously. No matter how the output voltage frequency and wind speed change, the pulse width modulation (PWM) converter can help to output stable DC voltage over wide wind speed ranges With this consideration, the research on SCIG in vertical-axis wind turbines is developed in this paper. For an off‐grid vertical‐axis system, it has some the off-grid vertical-axis windconvenient power system is very suitable for power directly supplying production additional advantagesSCIG including installation and improved generation efficiency.
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