Abstract
This paper presents a fast synergetic control scheme for chaotic oscillation in a three-bus power system model. First, the coupling dynamic model of a controlled power system with the current source converter-based STATCOM device and energy storage device is established. Then, the input-output linearization process for the controlled power system is derived step by step, the control problem for the complex nonlinear power system model is completely transformed into the control of linear systems, and a fast synergetic control scheme is proposed for these linear systems. Since the designed control inputs contain complex system functions which are very difficult to obtain and reduce the engineering practicability of the designed controllers, the assumption that system functions are bounded is introduced into the controller design process, and the controllers are redesigned. The remarkable advantages of the proposed control method are that it improves the rapidity of traditional synergetic control and avoids complex system functions in control inputs. Finally, the effectiveness and the superiority of the control scheme are verified by simulation results.
Highlights
Power system is a typical high-dimensional, complex, and strong coupling dynamic system
The control methods in [12,13,14] often fail to consider the physical background of the power system and control chaos by means of full-state regulation, which makes the designed control inputs not practical
(1) Aiming at chaos control of a three-bus power system, a nonlinear dynamic system model of the complex controlled power system is constructed. e nonlinear system is linearized step by step, the control problem of the nonlinear power system is transformed into controlling linear systems, and a fast synergetic control scheme is proposed to suppress the chaotic oscillation in the power system
Summary
Power system is a typical high-dimensional, complex, and strong coupling dynamic system. Erefore, it has practical value to design controllers for the chaotic power system by combining the current source converter-based STATCOM with the energy storage device. E main contributions of the paper are as follows: (1) a complex coupling dynamic model composed of the power system model, energy storage device model, and current source converter-based STATCOM model is established for chaos control in a three-bus power system; (2) compared with the widely used inputoutput feedback linearization-based sliding mode control, the proposed input-output feedback linearization-based synergetic control completely avoids the chattering problem; (3) compared with traditional synergetic control, the proposed fast synergetic control improves the rapidity of control by adding an exponential term to the dynamic equation satisfied by the macrovariables of traditional synergetic control. E eleven variables mentioned above are state variables of the controlled power system. ues and ues represent control inputs of the two energy storage devices; uST1 and uST2 represent control inputs of the STATCOM. ese four variables are input variables of the controlled power system
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