Nonlinear control strategy insuring contribution of PV generator to voltage and frequency regulation

• Published in: 6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012) p. D42
• Main Authors: Okou, A.F, Akhrif, O, Beguenane, R, Tarbouchi, M
• Format: Conference Proceeding
• Language: English
• Published: Stevenage IET 2012; The Institution of Engineering & Technology
• Subjects: Control of electric power systems; Frequency control; Power convertors and power supplies to apparatus; Self-adjusting control systems; Solar power stations and photovoltaic power systems; Voltage control; nonlinear control strategy insuring contribution; q-axis current controller; photovoltaic power systems; adaptive control; frequency control; frequency regulation; voltage regulation; DC-DC power convertors; DC-DC boost converter; DC-AC power convertors; backstepping control design; grid connected PV generator; voltage control; DC/AC converter; adaptive control scheme
• ISBN: 1849196168; 9781849196161
• DOI: 10.1049/cp.2012.0332

This paper present a novel control scheme for a grid connected PV generator that contributes to the frequency and voltage regulation of a power system. The PV generator consists of a PV panel connected to a DC/AC converter via a DC-DC boost converter. The frequency regulator controls the boost converter and the voltage regulator controls the DC/AC converter. The proposed frequency regulator includes a frequency control module that changes the reference signal of a power control module when the frequency deviation is significant. An adaptive control scheme is employed to find the frequency control module equation and a nonlinear control scheme is used to find the active power control module equation. A backstepping control design method is employed to obtain the proposed voltage regulator equations. It consists of a module that uses the voltage deviation to generate the reference for a q-axis current controller. A module that maintains the DC-link voltage is also included. A backstepping control design method is also employed to find its equations. The proposed control system is evaluated in simulation. The results reveal that with the proposed control scheme, a PV generator behaves like a conventional synchronous generator when the grid frequency changes significantly. (5 pages)