Abstract
This paper proposes a control scheme of back-to-back PWM converters for the permanent magnet synchronous generator (PMSG) wind turbine system. The DC-link voltage can be controlled at the machine-side converter (MSC), while the grid-side converter (GSC) controls the grid active power for a maximum power point tracking (MPPT). At the grid fault condition, the DC-link voltage controller is designed using a feedback linearization (FL) theory. For the MPPT, a proportional control loop is added to the torque control to reduce the influence of the inertia moment in the wind turbines, which can improve its dynamic performance. The validity of this control algorithm has been verified by the simulation of the 2-MW PMSG wind turbine system.
Highlights
In the recent years, the wind power generation has been concerned as one of the most rapidly growing energy sources in the world since the natural resources are becoming exhausted
In the variable-speed wind turbine (WT) systems, a direct-drive wind energy conversion system based on permanent magnet synchronous generator (PMSG) has a lot of advantages such as no gearbox, high precision, high power density, and simple control method, except initial installation costs [1], [2]
For the low voltage ride-through (LVRT) purpose, a crowbar system consisting an external resistor is connected in the rotor-side of the doubly-fed induction generator (DFIG) to absorb the active power during the grid fault [7], [8]
Summary
The wind power generation has been concerned as one of the most rapidly growing energy sources in the world since the natural resources are becoming exhausted. For the low voltage ride-through (LVRT) purpose, a crowbar system consisting an external resistor is connected in the rotor-side of the doubly-fed induction generator (DFIG) to absorb the active power during the grid fault [7], [8]. The STATCOM can not be used alone without the BC Another different solution which employs the energy storage system (ESS) can offer a ridethrough capability and suppress the output power fluctuation of the wind turbine systems [16]. In this method, in order to reduce the ESS power capacity that it can absorb the full differential power during the grid voltage fault, the generator speed can be increased to store the kinetic energy in the system inertia.
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