TAILIEUCHUNG - Power Quality Harmonics Analysis and Real Measurements Data Part 7

Tham khảo tài liệu 'power quality harmonics analysis and real measurements data part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Part 2 Converters 4 Study of LCC Resonant Transistor DC DC Converter with Capacitive Output Filter Nikolay Bankov Aleksandar Vuchev and Georgi Terziyski University of Food Technologies - Plovdiv Bulgaria 1. Introduction The transistor LCC resonant DC DC converters of electrical energy working at frequencies higher than the resonant one have found application in building powerful energy supplying equipment for various electrical technologies Cheron et al. 1985 Malesani et al. 1995 Jyothi Jaison 2009 . To a great extent this is due to their remarkable power and mass-dimension parameters as well as to their high operating reliability. Besides in a very wide-working field the LCC resonant converters behave like current sources with big internal impedance. These converters are entirely fit for work in the whole range from no-load to short circuit while retaining the conditions for soft commutation of the controllable switches. There is a multitude of publications dedicated to the theoretical investigation of the LCC resonant converters working at a frequency higher than their resonant one Malesani et al. 1995 Ivensky et al. 1999 . In their studies most often the first harmonic analysis is used which is practically precise enough only in the field of high loads of the converter. With the decrease in the load the mistakes related to using the method of the first harmonic could obtain fairly considerable values. During the analysis the influence of the auxiliary snubber capacitors on the controllable switches is usually neglected and in case of availability of a matching transformer only its transformation ratio is taken into account. Thus a very precise description of the converter operation in a wide range of load changes is achieved. However when the load resistance has a considerable value the models created following the method mentioned above are not correct. They cannot be used to explain what the permissible limitations of load change depend on in case of retaining

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