Research on Passivity-Based ADRC of Direct-Drive Wind Power System Back to Back PWM Converter

Abstract:

In order to improve the performance of the converter for restrain the machine-side PWM rectifier load disturbance impact on the output DC voltage in direct-drive wind power system. A hybrid control strategy based on ADRC and the EL model was presented, using ESO to observe and compensate the load disturbances, achieving voltage outer control by ADRC method and comparing with PI control. However, as to grid-side PWM inverter, energy shaping method which based on PCHD model and the IDA-PBC control algorithm is adopted to design passivity-based controller, which is able to make the energy function have the minimum value when inverter is at the desired point, thus improving the stability and the load disturbance-rejection ability for the inverter. Simulation results show that the machine-side PWM rectifier can make the currents and voltages of AC side achieve synchronous, DC voltage can fast-track desired values; grid-side PWM inverter can achieve unity power factor and make the AC current sinusoidal.

• Periodical: Applied Mechanics and Materials (Volumes 457-458)
• Pages: 1363-1370
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.457-458.1363
• Online since: October 2013
• Authors: Xian Qin Ma, Jiu He Wang
• Keywords: ADRC, Direct-Drive Wind Power System, Passivity-Based Control, PCHD

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