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Синтез контуру керування вихідною напругою нелінійного твердотільного трансформатора

Synthesis of the output voltage control loop of a nonlinear Solid State Transformer
Authors: Mysak, Taras Volodymyrovych;

Синтез контуру керування вихідною напругою нелінійного твердотільного трансформатора

Abstract

The object of the study is an autonomous source of sinusoidal voltage, which consists of a bridge frequency converter with PWM, equipped with an output LC filter and a single-phase nonlinear output transformer with an additional filter capacitor, which is connected to the output of the secondary winding. The factors hindering the technical implementation of the control of this object are analyzed. The nonlinearity of the transformer's magnetic system is approximated by a power series along with odd exponents. The substitution of variables made possible to develop a mathematical description of the circuit in the form of a nonlinear singularly perturbed system of differential equations. It is assumed that there is an attractive invariant surface, which makes it possible to reduce the order of the original system of equations. An analytical form of the equations of this surface in the form of a series in powers of a small parameter is obtained. A local region of state space is defined in which a nonlinearity can be transformed to a form that allows the fulfillment of the conditions of the Poincaré-Lyapunov theorem for a nonlinear system of differential equations. A system of lower-order differential equations is obtained that is equivalent in some region to the original nonlinear singularly perturbed system. The possibility of replacing a nonlinear system of a reduced order by its first approximation for the construction of a control law is substantiated. The control law is synthesized using the Lyapunov function method for the first-approximation system of equations. The control law is a linear combination of the variables of the reduced system of equations. The choice of the Lyapunov function in the form allowing to establish an unambiguous relationship between the coefficients of this function and the scale coefficients of the control law equation is proposed. Analytical expressions for calculating these scale factors are obtained. The results of digital simulation are presented. The simulation was performed taking into account the limitations inherent in the real object of power electronics and affecting the possibility of technical implementation of the obtained control law.Bibl.10, Fig.2

Объектом исследования является автономный источник синусоидального напряжения, который состоит из мостового преобразователя частоты с ШИМ, выходным LC-фильтром и однофазным нелинейным выходным трансформатором с конденсатором на выходе. Получено математическое описание нелинейной сингулярно-возмущенной системы дифференциальных уравнений, для которой проведена редукция. Нелинейность приведена к виду, который позволил выполнить синтез закона управления с использованием метода функций Ляпунова. Приведены результаты моделирования, проведенного с учетом ограничений, влияющих на возможность технической реализации полученного закона управления.Библ.10, рис.2

Об`єктом дослідження є автономне джерело синусоїдальної напруги, яке має в своєму складі перетворювач частоти з ШІМ та вихідним LC-фільтром і нелінійний однофазний вихідний трансформатор з ємністю на виході. Отримано математичний опис цього джерела, як нелінійної сингулярно-збуреної системи диференціальних рівнянь, для якої проведено редукцію. Нелінійність приведено до вигляду, який дозволив здійснити синтез закону керування з використанням методу функцій Ляпунова. Наводяться результати моделювання, проведеного з врахуванням обмежень, які впливають на технічну можливість реалізації отриманого закону керування.Бібл.10, рис.2

Keywords

Электроника; Техника, вихідний LC-фільтр, нелинейный однофазный трансформатор, метод функций Ляпунова, Solid State Transformer; перетворювач частоти; вихідний LC-фільтр; нелінійний однофазний трансформатор; сингулярно-збурена система; метод функцій Ляпунова, frequency converter, Техніка, Електроніка, перетворювач частоти, singular perturbed system, Lyapunov functions method, сингулярно-возмущенная система, Solid State Transformer; frequency converter; output LC-filter; one phase nonlinear transformer; singular perturbed system; Lyapunov functions method, нелінійний однофазний трансформатор, преобразователь частоты, Solid State Transformer, выходной LC-фильтр, Electronics; Technique, метод функцій Ляпунова, output LC-filter, one phase nonlinear transformer, Solid State Transformer; преобразователь частоты; выходной LC-фильтр; нелинейный однофазный трансформатор; сингулярно-возмущенная система; метод функций Ляпунова., сингулярно-збурена система

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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