Abstract
With respect to the AC-DC-AC power conversion system of large-power wave energy converters (WECs), the DC bus voltage stability is essential for the normal operation of the WEC. It is especially true when the WEC works in the islanding cases. In this paper, a mathematical model of the pulse width modulation (PWM) rectifier in the hydraulic-electric energy conversion system of WEC is established, for voltage fluctuation characteristic analysis of the DC bus. Accordingly, a DC bus voltage control method based on the active disturbance rejection control (ADRC) with an improved cascaded expanded state observer (ICESO) is proposed. It is noted that a second-order linear expanded state observer (ESO) is deployed in a cascaded form, to compensate the disturbance observation error of the traditional linear first-order ESO. Based on the theoretical analysis, it is indicated that the proposed ICESO-ADRC method could achieve faster input signal tracking, better disturbance rejection and rapid dynamic performance with low overshoot. Finally, simulation results verify the feasibility of the proposed ICESO-ADRC method for DC bus voltage fluctuation reduction in wave energy conversion.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
