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High performance DC-AC power converter using adaptive control technique for advanced material machining

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The ANFIS is thus employed to eliminate the chattering and simultaneously the HTSS provides finite system-state convergence time. By combining HTSS with ANFIS, the DC-AC power converter of AMM will achieve robust performance. Experimental results are given to conform that the proposed technique can obtain low total harmonic distortion (THD) and fast transience even under phase-controlled loads. | Journal of Automation and Control Engineering Vol. 5, No. 1, June 2017 High-Performance DC-AC Power Converter Using Adaptive Control Technique for Advanced Material Machining En-Chih Chang Department of Electrical Engineering, I-Shou University, No.1, Sec. 1, Syuecheng Rd., Dashu District, Kaohsiung City 84001, Taiwan, R.O.C. Email: enchihchang@isu.edu.tw Wei Liu and Hongshu Huang Electrical Engineering and Automation, Guangzhou University, Guangzhou 510006, P.R.C. Email: 13822109999@139.com, hhs1550@163.com Rong-Ching Wu Department of Electrical Engineering, I-Shou University, No.1, Sec. 1, Syuecheng Rd., Dashu District, Kaohsiung City 84001, Taiwan, R.O.C. Email: rcwu@isu.edu.tw possible. To obtain these requirements, proportionalintegral (PI) controller is one of the useful ways to achieve suitable characteristics. But, PI is difficult for converter control to gain good steady-state and dynamic response under nonlinear loads [5-8]. Many control techniques are also used in literature, such as musynthesis, H-infinity control, wavelet control, and so on [9-14]. However, these techniques are complex, and difficult to realize. Proposed in 1950s, sliding mode control (SMC) provides insensitivity to parameter variations and removal of disturbances [15], [16]; SMC of DC-AC power converter systems are also developed. However, these SMC systems use linear sliding surface, and such surface has infinite system-state convergence time [17-20]. Thus to increase the convergence speed, a hyperbolic tangential sliding surface (HTSS) can be used. Compared with linear sliding-surface-based, the HTSS can enforce system tracking error to converge to zero in finite time [21-24]. However, when a severe nonlinear load is applied, the HTSS system still exists in chattering problem. The chattering will cause high THD in DC-AC power converter output and the stability and reliability of the AMM are thus deteriorated. Adaptive neuro-fuzzy inference system (ANFIS) associating the training