Design and implementation of a linear quadratic regulator controlled active power conditioner for effective source utilisation and voltage regulation in low‐power wind energy conversion systems

Abstract

Power electronic converters play a major role in wind energy conversion systems (WECS). A typical variable speed WECS includes wind turbine, permanent magnet synchronous generator (PMSG) and power conditioners. In this study, a three-phase modular boost converter supplied from a PMSG and controlled using a linear quadratic regulator (LQR) is proposed for battery charging applications. Each phase of PMSG is connected to a single phase diode rectifier and a DC-DC boost converter. All boost converters have a common output capacitor and load. The proportionalintegral-based voltage controller provides voltage regulation on the DC side. A fixed frequency LQR-based current controller applied for the individual phases provides a better three-phase source utilisation. The instantaneous pq theory is adopted for the reference current calculation. Extensive simulation studies based on the models developed using MATLAB/SIMULINK reveal that the proposed system performs satisfactorily for step variations in wind speed and load. The performance of the low power prototype developed and controlled using a dSPACE 1104 digital signal processor shows good output voltage regulation and better source utilisation for wide variations in load.

Performance and dynamic response enhancement of PMSG based wind turbines employing boost converter-diode rectifier as the machine-side converter

“…There are some papers [11][12][13][14][15][16][17][18][19][20][21] in literatures regarding different aspects of PMSG-WTs employing boost converterdiode rectifier. Ref.…”

“…[17][18] use model predictive control approach for the control of PMSG-WT with boost converter-diode rectifier. In [19], an active power conditioner based on low power wind system is presented in which a boost converter fed from a PMSG is used for battery charging. Refs.…”

“…denotes the small variation around the operating point. According to(19), the shaft torsional torque natural frequency, n  , and damping ratio,  , are obtained as: 2 D as the shaft damping coefficient is relatively small resulting in the low value of damping ratio  . Considering(19), if the PMSG torque Te and accordingly the boost converter current…”

Mathematical modeling, dynamic response analysis, and control of PMSG‐based wind turbines operating with an alternative control structure in power control mode

“…The MSC and GSC structures can be in the form of back‐to‐back VSCs or a combination of diode bridge rectifier‐boost converter and VSC. Some research works employ diode bridge rectifier‐boost converter as MSC. However, in this paper, the MSC and GSC are indeed in the form of the back‐to‐back VSCs which are more popular.…”

Reduced order linear quadratic regulator controller for voltage multiplier cells integrated boost converter

“…Hysteresis modulation based sliding mode control for single VMC integrated boost converter is suggested in [20]. An optimal control technique for DC-DC converters is suggested [21][22][23][24][25][26][27][28]. In this work, the dynamics of the basic topology of VMC integrated boost converter is examined with reduced order linear quadratic regulator (ROLQR) and the results are compared with hysteresis current controller (HCC).…”