Voltage and frequency control of wind–diesel power system through adaptive sliding mode control of superconducting magnetic energy storage

Abstract

The random nature of wind power along with active and reactive load changes results in both frequency and voltage fluctuations in a wind–diesel power system. In order to improve the dynamic performance by regulating the frequency as well as voltage of the system, an adaptive sliding mode control strategy is proposed on superconducting magnetic energy storage unit interfaced with a wind–diesel power system. Sliding mode control strategy developed with the superconducting magnetic energy storage unit achieves fast and effective exchange of real and reactive power via firing angle control of the converter. With the help of suitable switching surface design and use of adaptive control law, chattering elimination and controller robustness is achieved. This work is carried out in MATLAB/Simulink, and simulation results presented shows a positive impact of proposed scheme.

Dynamic performance improvement of wind-diesel power system through robust sliding mode control of hybrid energy storage system

“…Similarly, the active and reactive exchange through converter by the SMES unit is given by the equation (Rabbani et al, 1999; Thoker and Lone, 2021):…”

“…The reaching law for the STSMC controller is given as (Shtessel et al, 2010; Thoker and Lone, 2021):…”

Higher order sliding mode reactive power control of a hybrid power system with wind power and parameter uncertainty

“…By taking the Laplace transform of equation (9), the dynamic change in the system bus voltage due to reactive power imbalance in the system is given by 4,27…”

“…[21][22][23] In power system applications, SMC has a prime feature of showing robust performance during transient conditions and fluctuations in renewable energy integrated sources. 24,25 In Mi et al, 26 Thoker and Lone, 27 and Yunhao et al, 28 SMC is designed and implemented over FACTS and energy storage devices to control their operations to ensure the reactive power balance in isolated wind-diesel power systems. However, in Mi et al 26 and Yunhao et al, 28 chattering issue details are ignored, and in addition, wind power disturbances and parameter uncertainties have not been considered.…”

“…However, in Mi et al 26 and Yunhao et al, 28 chattering issue details are ignored, and in addition, wind power disturbances and parameter uncertainties have not been considered. In Thoker and Lone, 27 although the chattering phenomenon is addressed through adaptive sliding mode control, the parameters uncertainties of superconducting magnetic energy storage and excitation system have not been considered. The discontinuous switching law in the sliding mode controller leads to the phenomenon of chattering, which are the high-frequency oscillations of finite magnitude.…”