- 标题
- 摘要
- 关键词
- 实验方案
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Nonlinear Analysis Methods Applied on Grid-Connected Photovoltaic (PV) Systems Driven by Power Electronic Converters
摘要： A novel method of analysis is deployed in detail on the basis of nonlinear systems theory with aim to design suitable controllers with guaranteed stability for grid-connected photovoltaic (PV) systems driven by power converters. By this method, all the system nonlinearities are taken into account to allow a reliable analysis in a wide range of operation and to avoid instabilities that as shown in the paper can be occurred by inappropriate design. To this end, firstly a detailed accurate nonlinear dynamic model is presented for the PV system by including a cascade-mode control scheme. Then, taking into account the closed-loop system and incorporating the concept of input-to-state stability (ISS), a rigorous novel stability analysis is developed which achieves to prove asymptotic stability of the desired equilibrium point. A multi-step process is deployed in which the control loops operating in cascade-mode are involved. However, since the cascaded-mode control scheme and analysis is based on the time-scale separation principle, a systematic tuning method is conducted for the accurate gain selection of both inner-loop and outer-loop controllers which is based on the construction of suitable Lyapunov functions. To further validate the overall analysis, experimental results are carried out.
关键词： nonlinear analysis,grid-interaction,Photovoltaic systems,stability,power converter control design
更新于2025-09-23 15:21:01
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Geometrically nonlinear analysis of functionally graded piezoelectric plate using mesh-free RPIM
摘要： In this paper, geometrically nonlinear static response of functionally graded piezoelectric (FGP) plate under mechanical and electrical loads is studied by using Mesh-less method. Radial point interpolation method (RPIM) is used to create the shape function and approximate the field variables. The first order shear deformation plate theory (FSDT) and Von Karman strains are used to model the nonlinear behavior of the FGP plate. Power law distribution through the thickness is considered for all mechanical and piezoelectric properties. The Newton–Raphson method is used to solve the obtained nonlinear coupled equations. Comparison study of the present nonlinear piezoelectric RPIM model has been checked and compared the response with the published literature. By using Multi-Quadric (MQ) radial basis function and polynomial basis, the effects of different power law indices, boundary conditions, and mechanical and electrical loads on the nonlinear behavior of FGP plate is investigated. Comparing linear and nonlinear stresses shows that the general linear and nonlinear behavior of FGP plate is same however, the nonlinear analysis has low deflection and stresses. Results show that, the deflection and stresses by varying power law indices have extreme points, so it can be used as benchmark to design FGP sensor and actuators.
关键词： Geometrically nonlinear analysis,Electro-mechanical loading,Mesh-free methods,FGPM,RPIM
更新于2025-09-09 09:28:46
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[IEEE 2018 20th International Conference on Transparent Optical Networks (ICTON) - Bucharest (2018.7.1-2018.7.5)] 2018 20th International Conference on Transparent Optical Networks (ICTON) - Impact of Linear Mode Coupling on the Nonlinear Transmission Performance of Few-Mode Fibres
摘要： In this paper, we review the study of nonlinear transmission performance of few-mode fibre links operating for different linear mode coupling regimes and for different mode delay maps. We will describe how linear mode coupling and differential mode delay can be used to mitigate the overall nonlinear distortion and present optimum link configurations at practical levels of digital equalisation complexity.
关键词： linear mode coupling,differential mode delay,nonlinear analysis,few-mode fibres
更新于2025-09-04 15:30:14