Abstract
This paper presents the design procedure for the output LCL filter used in grid connected one-phase 15-level cascade voltage source inverter for photovoltaic application. Output power of a system is in kilowatt range due to one-phase connection. The filter design is based on detailed analysis as it is a multifold problem. Design is adopted for predictive current control technique with finite control set. Because of lack of modulation technique there is no detailed higher-order harmonic analysis. Key parameters that define filter performance are described. Step-by-step design of LCL filter is presented. The design procedure is done in pre-unit base so results can be used for wider range of power levels. No passive damping is considered as active damping is preferable with regard to high efficiency of photovoltaic inverter. DOI: http://dx.doi.org/10.5755/j01.eee.19.8.5394
Highlights
Modern photovoltaic inverters use high-frequency power converters modulated with pulse-width modulation (PWM)
The paper offers analysis of an LCL filter as well as design guidelines for the LCL filter used with 15level cascade voltage source inverter controlled by predictive control method with finite control set
The LCL filter must provide the inductive load for the output of voltage source inverter
Summary
Modern photovoltaic inverters use high-frequency power converters modulated with pulse-width modulation (PWM). Due to the high-frequency switching their output voltage and current contain high-frequency components. The purpose of the output LCL filter in grid connected systems is to mainly create the inductive load for voltage source inverter and to filter higher order harmonics in the current supplied to the grid. If there is high amount of energy stored in reactive components of LCL filter, the dynamic of the grid-connected inverter will be compromised. The paper offers analysis of an LCL filter as well as design guidelines for the LCL filter used with 15level cascade voltage source inverter controlled by predictive control method with finite control set. The LCL filter is used in grid-connected inverters due to its high attenuation of high-frequency signals. The LCL filter is a system of 3rd order with three resonant frequencies defined by three reactive components f 0 IGVS
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