THE ALGORITHMS OF HIGH-VOLTAGE FREQUENCY CONVERTERS CONTROL AND ASSESSMENT OF THEIR INFLUENCE ON PARAMETERS OF FILTER-COMPENSATING DEVICES

O Sinchuk, D Mykhailichenko
unpublished
In the article the actuality of the field of study has been presented-the realization of requirements of minimum possible distortion of current and voltage curves and the design of effective structure of high-voltage electric drive. The suggestions concerning the structure of block IGBT-frequency converter have been grounded and given. The algorithm of formation of the trapezoidal integral curve of output voltage and algorithm of the cyclic by-turn switching of blocks of converter has been
more » ... erter has been studied providing the decline of the dynamic losses in transistors and the increase of efficiency factor of the whole electrotechnical complex. The method of calculation of the L-type filter has been suggested. Визначено актуальність напряму дослідження-реалізація потреби мінімально можливого спотворення форм кривих струму та напруги і створення ефективної структури високовольтного електроприводу. Обгрунтовано та приведено пропозиції щодо структури блочного IGBT-перетворювача частоти. Представлено алгоритм формування трапецеїдальної інтегральної кривої вихідної напруги й алгоритм циклічного почергового переключення блоків перетворювача, що забезпечить зниження динамічних втрат у транзисторах і дозволить зменшити параметри складових системоутворюючих елементів. Як наслідок, підвищується коефіці-єнт корисної дії всього електротехнічного комплексу. Запропоновано метод розрахунку Г-подібного фільтра. Ключові слова: IGBT-перетворювач частоти, Г-подібний фільтр. PROBLEM STATEMENT. The high-voltage electric drive (HED) is the basic consumer of electric energy of industrial and especially mining and metallurgical works of the country. The problem of obtaining the required level of efficiency of the high-voltage systems is directly related to the task solution of providing of their energy efficiency that is grounded by a choice of their components-control systems [1]. In their turn, the obtainment or non-obtainment of the required level of energy efficiency of all the complex of HED is mostly determined with the type of one or another control system. Modern HEDs in their basis contain impulsive control system (ICS) by the level of voltage on the clamps of electric engines which provide the impulsive converters (IC) of electric energy (EE). It means that impulsive converters, being the effective types of EE conversion, simultaneously are the sources of distortion of forms as input so as the output current and voltage curves, that defines the most significant factor (HED)-the quality of EE that does not always represent the required level [2]. In this connection among the number of the basic requirements to the system of control of HED there is a requirement of minimum possible distortion of current and voltage curves, so it is necessary to solve the twofold problem-the design of effective structure of HED with minimum possible distortion of current and voltage curves. In order to achieve this goal there are two real methods: the algorithm of the IGBT-converter control and the filter-compensating device [3, 4].
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