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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">kaz29</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник Казахстанско-Британского технического университета</journal-title><trans-title-group xml:lang="en"><trans-title>Herald of the Kazakh-British Technical University</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1998-6688</issn><issn pub-type="epub">2959-8109</issn><publisher><publisher-name>Казахстанско-Британский Технический Университет</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">kaz29-264</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ИНФОКОММУНИКАЦИОННЫЕ СЕТИ И КИБЕРБЕЗОПАСНОСТЬ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>INFOCOMMUNICATION NETWORKS AND CYBERSECURITY</subject></subj-group></article-categories><title-group><article-title>ИССЛЕДОВАНИЕ УСТОЙЧИВОСТИ ЗАМКНУТОЙ НЕЛИНЕЙНОЙ СИСТЕМЫ “ПРЕОБРАЗОВАТЕЛЬ ЧАСТОТЫ - АСИНХРОННЫЙ ДВИГАТЕЛЬ” С ПОМОЩЬЮ MATLAB</article-title><trans-title-group xml:lang="en"><trans-title>STABILITY STUDY OF CLOSED NONLINEAR SYSTEM “FREQUENCY CONVERTER - ASYNCHRONOUS MOTOR” USING MATLAB</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Иманбекова</surname><given-names>Т. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Imanbekova</surname><given-names>T. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к. т. н., ассоц. профессор</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Жаркымбекова</surname><given-names>М. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Zharkymbekova</surname><given-names>M. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ст. преп.</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чныбаева</surname><given-names>Д. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Chnybaeva</surname><given-names>D. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ст. преп.</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Абдуллаев</surname><given-names>З. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Abdullaev</surname><given-names>Z. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ст. преп.</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Международный университет информационных технологий<country>Казахстан</country></aff><aff xml:lang="en">International Information Technology University<country>Kazakhstan</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Алматинский университет энергетики и связи<country>Казахстан</country></aff><aff xml:lang="en">Almaty University of Rower Engineering &amp; Telecommunications<country>Kazakhstan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>14</day><month>11</month><year>2021</year></pub-date><volume>16</volume><issue>3</issue><fpage>136</fpage><lpage>143</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Иманбекова Т.Д., Жаркымбекова М.Б., Чныбаева Д.М., Абдуллаев З.М., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Иманбекова Т.Д., Жаркымбекова М.Б., Чныбаева Д.М., Абдуллаев З.М.</copyright-holder><copyright-holder xml:lang="en">Imanbekova T.D., Zharkymbekova M.B., Chnybaeva D.M., Abdullaev Z.M.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vestnik.kbtu.edu.kz/jour/article/view/264">https://vestnik.kbtu.edu.kz/jour/article/view/264</self-uri><abstract><p>В статье приводится структурная схема замкнутой нелинейной системы «преобразова­тель частоты - асинхронный двигатель» в среде MATLAB с описанием передаточных функций системы. Приводится математическое описание переходных процессов замкнутой системы с нелинейным звеном в обратной связи, приводится программа решения системы дифференциальных уравнений, описывающих динамику переходных процессов замкнутой системы. Приведены сравнения переходных процессов линеаризованной системы с переходными процессами нелинейной замкнутой системой «преобразователь частоты - асинхронный двигатель». Рассмотрены алгоритмы определения устойчивости нелинейной системы методом фазовой траектории, методом гармонической линеаризации и методом решения нелинейных уравнений в символьном виде. Для каждого метода приведены программы определения устойчивости системы. Исходные данные для разомкнутой системы «преобразователь частоты - асинхронный двигатель» одинаковые, для нелинейного звена c обратной связью - разные. Приведены результаты исследования устойчивости замкнутой системы «преобразователь частоты -асинхронный двигатель», исследования переходных характеристик системы с помощью программной среды MATLAB.</p></abstract><trans-abstract xml:lang="en"><p>The article provides a block diagram of a closed non-linear system “frequency converter - asyn chronous motor” in the MATLAB environment with a description of the transfer functions of the system. A mathematical description of transient processes of a closed system with a nonlinear link in feedback is given, a program for solving a system of differential equations describing the dynamics of transients of a closed system is given. Comparisons of transients of a linearized system with transients of a nonlinear closed-loop “frequency converter - asynchronous motor” system are given. The algorithms for determining the stability of a nonlinear system using the phase trajectory method, the harmonic linearization method, and the method of solving nonlinear equations in symbolic form have been broken. For each method, system stability determination programs are given. The source data for the open-loop system “frequency converter - asynchronous motor” is the same, for a non-linear feedback system different. The results of the stability study of a closed system “frequency converter - asynchronous motor”, the study of the transient characteristics of the system using the software environment MATLAB are given.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>преобразователь частоты</kwd><kwd>асинхронный двигатель</kwd><kwd>устойчивость</kwd><kwd>звено с идеаль­ной релейной характеристикой</kwd><kwd>обратная связь</kwd></kwd-group><kwd-group xml:lang="en"><kwd>frequency converter</kwd><kwd>asynchronous motor</kwd><kwd>stability</kwd><kwd>link with an ideal relay characteristic</kwd><kwd>feedback</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Terekhov V. M., Osipov O. I. Electric drive control systems. 3rd ed., Sr.- M .: Publishing center “Academy”, 2008. -304 p.</mixed-citation><mixed-citation xml:lang="en">Terekhov V. M., Osipov O. I. 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