Abstract
This study develops a robust DC-link voltage tracking controller with variable control gain for permanent magnet synchronous generators. The first feature is to suggest an auto-tuning algorithm to drive the control gain to update the closed-loop cut-off frequency. The second one is to prove that the proposed controller incorporating auto-tuner and disturbance observer (DOB) coerces the closed-loop system to achieve the desired voltage tracking behavior, exponentially, with the steady-state rejection property. The control performance is demonstrated by emulating a wind-turbine power system using the powerSIM (PSIM) software.
Highlights
Nowadays, owing to major advantages such as high power density and efficiency, the permanent magnet synchronous machines (PMSMs) have rapidly replaced induction machines (IMs) for a wide range of industrial applications, including wind power systems [1,2,3,4,5,6,7]
PMSMs can be used as generators in various industrial applications, such as wind power systems and electric vehicles, and these generators are called permanent magnet synchronous generators (PMSGs)
The three-phase inverter has to be controlled to convert the AC power coming from a PMSG to the desired DC power, which can be viewed as an AC/DC conversion system with a several power source
Summary
Nowadays, owing to major advantages such as high power density and efficiency, the permanent magnet synchronous machines (PMSMs) have rapidly replaced induction machines (IMs) for a wide range of industrial applications, including wind power systems [1,2,3,4,5,6,7]. Cascade-type controllers are commonly adopted for regulating the DC-link voltage of AC/DC converters as they provide better closed-loop performance than single-loop type controllers [8,9]. A novel proportional-type controller embedding DOBs was suggested with a fixed closed-loop cut-off frequency for PMSG output voltage control applications [20]. It is desirable to update the control gain automatically for a desirable cut-off frequency leading to a better closed-loop performance during transient periods. The parameter and load variation problems are handled by considering the perturbed dynamical model and adopting properly designed DOBs. The contributions are twofold: (a) the introduction of a closed-loop cut-off frequency update mechanism by the use of the variable control gain from the proposed auto-tuner (b) a rigorous closed-loop analysis for convergence and performance recovery without steady-state errors in the absence of tracking error integrators. Software is used to emulate the wind power system, with the controller implemented using a dynamic link library (DLL)
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