Load frequency control by neural-network-based integral sliding mode for nonlinear power systems with wind turbines

Most of the existing results for load frequency control of multi-area interconnected power systems can only be obtained when the norm of the aggregated uncertainties is bounded by a positive constant. This condition is difficult to achieve in real multi-area interconnected power systems. In this paper, a new load frequency control (LFC) for multi-area interconnected power systems is developed based on a decentralised adaptive double integral sliding mode control technique where the above limitation is eliminated. First, an adaptive gain tuning law is adopted to estimate the unknown upper bound of the aggregated uncertainties. Second, a double integral sliding surface based adaptive sliding mode controller is proposed to improve the transient performance of the closed loop system. Simulation results show that the proposed control law results in shortening the frequency’s transient response, avoiding the overshoot, rejecting disturbance better, maintaining required control quality in the wider operating range, and being more robust to uncertainties as compared to some existing control methods.

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Observer based robust integral sliding mode load frequency control for wind power systems

Control Engineering Practice ◽

10.1016/j.conengprac.2017.05.001 ◽

2017 ◽

Vol 65 ◽

pp. 1-10 ◽

Cited By ~ 25

Author(s):

Yanliang Cui ◽

Lanlan Xu ◽

Minrui Fei ◽

Yubin Shen

Keyword(s):

Power Systems ◽

Wind Power ◽

Sliding Mode ◽

Frequency Control ◽

Load Frequency Control ◽

Integral Sliding Mode ◽

Load Frequency ◽

Wind Power Systems

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PI and LQR controllers for Frequency Regulation including Wind Generation

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v8i5.pp3711-3721 ◽

2018 ◽

Vol 8 (5) ◽

pp. 3711 ◽

Cited By ~ 3

Author(s):

Semaria Ruiz ◽

Julian Patiño ◽

Jairo Espinosa

Keyword(s):

Power Systems ◽

Wind Turbines ◽

Frequency Control ◽

Test System ◽

Performance Comparison ◽

Load Frequency Control ◽

Superior Performance ◽

Frequency Regulation ◽

Control Effort ◽

Load Frequency

<pre>The increasing use of renewable technologies such as wind turbines in power systems may require the contribution of these new sources into grid ancillary services, such as Load Frequency Control. Hence, this work dealt with the performance comparison of two traditional control structures, PI and LQR, for secondary regulation of Load Frequency Control with the participation of variable-speed wind turbines. For this purpose, the doubly-fed induction generator wind turbine was modeled with additional control loops for emulation of the inertial response of conventional machines for frequency regulation tasks. Performance of proposed strategies was verified through simulation in a benchmark adapted from the WSCC 3 machines 9-bus test system. Results showed overall superior performance for LQR controller, although requiring more strenuous control effort from conventional units than PI control.</pre>

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