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| Nonlinear dynamic behavior of H-bridge inverter with sliding mode control based on improved exponential approach law |
| JIANG Wei1,3, WU Ronghua1,2, YUAN Fang1 |
1.Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology, Nanchang 330013, China; 2.School of Computer Engineering, Anhui Wenda University of Information Engineering, Hefei 231201, China;
3.Faculty of Intelligent Manufacturing， Wuyi University， Jiangmen 529020， China |
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Abstract Sliding mode control based on improved exponential approach law has characteristics of fast response, strong robustness and strong adaptability, and a wide application prospect in H-bridge inverter control.However, the sliding mode control is a kind of nonlinear control mode, and inevitably exhibits abundant nonlinear dynamic behavior.The stability of the system is closely related to the selection of circuit and control parameters.Here, H-bridge inverter with sliding mode control based on improved exponential approach law was taken as the study object.Firstly, the working process of the system was analyzed, and the discretized model of the system was derived by using the stroboscopic mapping theory.Secondly, the bifurcation diagram was used to observe the evolution process of the system nonlinear dynamic behavior under the action of different control parameters, and the folding chart was used to do verifications one by one.Thirdly, the fast-varying stability theorem was used to analyze the stability of the system, and the study conclusion is completely consistent with that drawn by bifurcation diagram and folding chart analyses.Finally, the study showed that changes of external circuit parameters, such as, input voltage, load resistance and inductance have important effects on the system nonlinear dynamic behavior; the study results can provide a reliable theoretical basis for development, manufacturing and adjusting of H-bridge inverter with sliding mode control based on improved exponential approach law, and have certain theoretical significance and practical engineering value.
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Received: 10 September 2020
Published: 15 May 2021
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