Abstract
This paper focuses on the control problem of wind energy conversion systems (WECSs) with direct-driven permanent magnet synchronous generator (PMSG) working in variable power output stage. A novel compound control scheme combined the active disturbance rejection controller (ADRC) and speed sensorless technology is proposed. In order to achieve maximum power point tracking (MPPT), a speed control loop is designed based on ADRC to improve the speed tracking ability and anti-disturbance ability of system. Moreover, considering the large amount of system model information, a model-assisted ADRC is designed on the nominal ADRC to improve the response speed of system and reduce the energy consumption for the system control. Additionally, to solve the contradiction between the requirement of speed sensor precision and the economy of system design, a speed observer based on current model is designed in $\alpha -\beta $ coordinate system. Furthermore, a resistance observer is introduced to improve the convergence rate of the observer. And a position sensorless observer structure based on the speed observer is proposed. Finally, simulation studies are conducted to evaluate power tracking performances of the proposed speed-observer-based model assisted ADRC technology. It is shown that the proposed compound scheme exhibits significant improvements in both control performance and anti-disturbance ability with high observation precision compared with the normal ADRC method.
Highlights
Considering limitation of fossil energy and negative impact on environment caused by fossil fuel emissions, increasing demand for energy has gradually turned our attention to renewable energy generation, which involves control of generator sets [1]–[3]
On the basis of Han’s nonlinear active disturbance rejection controller (ADRC), a novel structure of linear active disturbance rejection control (LADCR) is further proposed by Gao to simplify the controller design and reduce the difficulty in parametric tuning [27]. This maximum power point tracking (MPPT) control strategy has a few tuning parameters, which makes it easy to be implemented in the real system, so the LADRC method has been applied to wind energy conversion systems [4], [28]–[37]
The speed sensorless controller based on an observer technology is proposed for wind power control system. Considering these problems related to permanent magnet synchronous generator (PMSG)-based wind energy conversion systems (WECSs), the proposed model assisted ADRCbased on sensorless technology is an effective controller in dealing with problems of the disturbances and physical velocity sensor in wind turbine and tracking the maximum wind power
Summary
Considering limitation of fossil energy and negative impact on environment caused by fossil fuel emissions, increasing demand for energy has gradually turned our attention to renewable energy generation, which involves control of generator sets [1]–[3]. On the basis of Han’s nonlinear ADRC, a novel structure of linear active disturbance rejection control (LADCR) is further proposed by Gao to simplify the controller design and reduce the difficulty in parametric tuning [27] This maximum power point tracking (MPPT) control strategy has a few tuning parameters, which makes it easy to be implemented in the real system, so the LADRC method has been applied to wind energy conversion systems [4], [28]–[37]. As discussed above, aiming to improve the power tracking performance of the PMSG-based WECSs with various uncertainties, an ADRC based MPPT control method with sensorless technology, is developed to completely attenuate the internal and external disturbances in this paper.
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