LCC resonant power electronic converter for photovoltaic system with battery energy storage

摘要

Power electronic converters are an integral element of power generation systems based on renewable energy sources which is photovoltaic array. Converters enable the control and correction measures of current and voltage characteristics on the output of the power plant, as well as proper operation of energy storage device. Moreover, such converters facilitate and control power load of the power electronic system. Particular interest should be paid to the parameters of the converter responsible for the operation of the energy storage device. It should be characterized by: easiness of control, low costs and especially high efficiency. The authors suggestion for this application is to implement a resonant LCC converter in a three-phase converter system. Research of the device has been conducted in a one-dimensional energy flow version. Tests for resonant system and hard switching have also been done. Conducted tests provide evidence of the converters high efficiency at the voltage level of the rated voltage. The results prove that the mentioned converter is appropriate for application in cooperation with a battery energy storage device. What is more, the dynamic and static characteristics of the investigated converter are also satisfactory. Still, in order to facilitate the formation of new converters prototypes, the authors designed a universal bridge system with a driver. Suggested model enables formation of devices with the power range from hundreds of watts to several dozens of kilowatts.