Abstract
In the power system, the loads and nonlinearity parameters cause the system frequency deviation, which complicates the load frequency control (LFC). To deal with the above problem, an adaptive sliding mode control (SMC) based on disturbance observer is proposed to eliminate frequency deviation for interconnected power system in this paper. Firstly, the mathematical model of the power system is established, where the power exchange between the tie line is considered as the variable of the designed sliding surface. Secondly, the nonlinear disturbance observer is constructed to estimate the parameter uncertainty and load of power system. Thirdly, combined with the estimated value of the disturbance observer and integral sliding mode surface, the SMC is designed. Moreover, considering the inherent shortcoming of SMC—the chattering problem, an adaptive strategy is applied to the SMC to ensure the stability of controller. Next, the stability of the designed SMC is proved by Lyapunov stability theory. Finally, to verify the effectiveness of the proposed controller, several simulations are presented.
Highlights
load frequency control (LFC) is a crucial technology for stable operation of modern large-scale interconnected power systems
Yang Mi proposed sliding mode control (SMC) based on proportion-lintegral sliding mode surface, and this method was proved that micro-grid can be immune to the external disturbances with matched and unmatched conditions
SMC has been proven to be a powerful controller in many documents, and it is adopted to many fields, such as aircraft, robots, and inverted pendulums
Summary
LFC is a crucial technology for stable operation of modern large-scale interconnected power systems. As the integration of renewable energy power generation, the characteristics of power system are non-linear, the PID control has no ability to eliminate frequency deviation, especially when the actual work point of micro-grid deviates far from the expected work point (Tang et al, 2015). SMC is an alternative control strategy to address load frequency problems in micro-grid. Yang Mi proposed SMC based on proportion-lintegral sliding mode surface, and this method was proved that micro-grid can be immune to the external disturbances with matched and unmatched conditions. An adaptive SMC strategy based on disturbance observer is investigated to eliminate frequency deviation.
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