Experimental verification of variable speed wind power generation system using permanent magnet synchronous generator by wind turbine emulator

Abstract

This paper presents the experimental results of variable speed wind power generation system (VSWPGS) using permanent magnet synchronous generator (PMSG). The back to back PWM converters are utilized as converters for the VSWPGS. The experimental results are obtained by the test bench using the wind turbine emulator. The wind turbine emulator are reproduced the behaviors of windmill by the servo motor drives. The mechanical torque reference to derive the servo motor is calculated from windmill wing profile, the wind velocity and windmill rotational speed. The VSWPGS using PMSG employs the vector control system to control the torque and speed of PMSG in the converter side. The windmill rotational speed is controlled to maximize the efficiency of wind turbine against wind speed in low-and middle range. When the wind speeds exceeds the rated value, the windmill rotational speed and output power are controlled to be the rated values by the pitch angle control system. And the active power and reactive power are controlled in the inverter side, and generated power is sent to the grid-connected power generation while controlling the DC link voltage to be constant at the same time.

Emulation of Wind Turbines

“…The nominal torque (1 pu) to be emulated on the motor shaft corresponds to a load of 16. 6 Nm. An acquisition board PCI-2511 performs the hardwaresoftware interface circuit.…”

“…An emulation system based on an induction motor (IM) has a smaller size relative to the DC motor for a given power range and has lower cost. Emulators from IM are also described in references [6][7][8].…”

Battery impedance measurement using sinusoidal ripple current emulator

“…To overcome these difficulties, wind turbine emulators have developed and validated the response of real hardware using advanced perturbation methods [37]. It has also been designed to facilitate tests on wind energy systems under several wind speed conditions for feasibility and performance analysis of a wind emulator [38][39][40]. The SRC emulation is a strategy to produce the ac ripple current perturbation into dc charging current and streamline the testing process, ensuring considerable savings in designed time and cost before implementing in an actual battery charger.…”

Experimental Assessment with Wind Turbine Emulator of Variable-Speed Wind Power Generation System using Boost Chopper Circuit of Permanent Magnet Synchronous Generator

“…In recent years, variable-speed wind generator systems using the PWM converter (PWM converter scheme) have been introduced [3]- [6]. PWM converter is costly because many switching devices are used, and its control system is complicated.…”

“…The investigation of wind power system involves high-performance wind turbine emulators (WTEs), particularly for the development of optimal control solutions. Several studies are being conducted on variable-speed wind generator systems that change the windmill rotational frequency in proportion to wind velocity to utilize renewable wind energy effectively by using power generating systems [1]- [6]. The energy conversion efficiency of propeller windmills depends on wind velocity and windmill speed.…”