APPLICATION OF NONLINEAR PID CONTROLLER IN SUPERCONDUCTING MAGNETIC ENERGY STORAGE

As a new control strategy, Nonlinear PID(NLPID) controller has been introduced in the power system successfully. The controller is free of planting model foundation in the design procedure and realized simply. In this paper, a nonlinear PID controller used for superconducting magnetic energy storage (SMES) unit connected to a power system is proposed. Purpose of designing such controller is to improve the stability of the power system in a relatively wide operation range. The design procedure takes into account the active and reactive power cooperative control scheme and the simple structure so as to be apt to the practical use. Circuit design and implementation of the proposed controller is presented subsequently. At the same time, simulation is carried out to investigate the performance of the proposed controller in a high order nonlinear power system model under the MATLAB environment. The results show satisfactory performance and good robustness of the controller. The feasibility of the controller is testified as well.

Keywords:

SMES tracking-differentiator, nonlinear PID controller,

PDF

___

Yoke Lin Tan，Youyi Wang，“Augmentation of Transient Stability Using A Superconducting Ciol and Adaptive Nonlinear Control”, IEEE Trans. on Power Systems,vol.13, no.2, pp.361-365,May 1998.
Funabiki S., Yorioka T., Fujii T., “An Experiment of Fuzzy Control for Leveling Load Power Fluctuations Using An SMES Simulator”, Thirty-Third IAS Annual Meeting, Industry Application Conference, vol.2, pp.1269- ,October 1998.
Pal B.C., Coonick A.H., Cory B.J., “Robust Damping of Inter-area Oscillations in Power System with Superconducting Magnetic Energy Storage Devices”, IEEE Proceeding, Generation, Transmission and Distribution, vol.146, issue:6, pp.633-639, November,1999.
Jiang Quanyuan, Cheng Shijie, Cao Yijia, et al,“A Genetic Approach To Mixed Robust Control Design For SMES”, Automation of Electrical Power Systems, vol.26, no.12, pp.14- , June 2002.
Han Jingqing, Wang Wei, “Nonlinear Tracking-Differentiator”, J. Sys. Sci. & Math. Scis. ,vol.14,no.2,pp.177-183,February 1994.
Han Jingqing, “Nonlinear PID Controller”, ACTA Automation Sinica, vol.20, no.4, pp.487- , April 1994.
Zhang Cai, Zhou Xiaoxin, Jiang Lin, et al, “A Nonlinear PID Controller For TCSC”, Power System Technology, vol.23, no.10, pp.14-18, October 1999.
Guan Tianqi, Mei Shengwei, Lu Qiang, et al, “Nonlinear Robust Control Design for Power System Including Superconducting Magnetic Energy Storage Devices”, Automation of Electrical Power Systems,vol.25,no.17,pp.1-5, September,2001.