scholarly journals Modified T-type topology of three-phase multi-level inverter for photovoltaic systems

Author(s):  
Abderrahmane Ouchatti ◽  
Redouane Majdoul ◽  
Ahmed Moutabir ◽  
Abderrahim Taouni ◽  
Abdelouahed Touati

In this article, a three-phase multilevel neutral-point-clamped inverter with a modified t-type structure of switches is proposed. A pulse width modulation (PWM) scheme of the proposed inverter is also developed. The proposed topology of the multilevel inverter has the advantage of being simple, on the one hand since it does contain only semiconductors in reduced number (corresponding to the number of required voltage levels), and no other components such as switching or flying capacitors, and on the other hand, the control scheme is much simpler and more suitable for variable frequency and voltage control. The performances of this inverter are analyzed through simulations carried out in the MATLAB/Simulink environment on a three-phase inverter with 9 levels. In all simulations, the proposed topology is connected with R-load or RL-load without any output filter.

Author(s):  
Debadyuti Banerjee

Abstract: This paper proposes a seven level three phase inverter with PWM control scheme for better performance and magnitude control of output voltage. This proposed inverter offers a proper isolation between load and inverter circuit and different phases also. This inverter is capable of generating waveforms independently for different phases. By changing the reference signal frequency output frequency can be changed which is capable to make the system of variable frequency. Use of reverse voltage topology has increased the magnitude of output voltage. Proper application of diode makes the unidirectional switch bidirectional and decreases the number of switches. Keywords: Pulse width modulation, multi-level topology, bi-directional switches, isolation system


Author(s):  
Raymundo Cordero Garcia ◽  
João Onofre Pereira Pinto

This paper presents a simplified algorithm of space vector pulse width modulation (SVPWM) for a two-level three-phase inverter, which can operate in undermodulation and overmodulation modes. In other simplifications founded in literature, the reference voltages are modified and compared with a triangular carrier to estimate the switching states of the inverter. However, this paper proposes the modification of the carrier signal instead of the references. This procedure reduces the number of mathematical operations and increases the execution speed of SVPWM algorithm in DSPs or FPGAs. The reference voltages are sinusoidal, even for overmodulation mode. Simulation and experimental results proves that the proposed simplification produces the same switching patterns than conventional SVPWM, is simpler and is faster than other simplifications.


Author(s):  
Zainal Salam ◽  
Khosru Mohammad Salim

Artikel ini menerangkan penggunaan pengawal mikro serbaguna untuk menjana denyut–denyut modulasi lebar jalur untuk penyongsang tiga fasa. Kelebihan utama teknik ini adalah keringkasan perkakasan – hanya sebuah pengawal mikro dengan peralatan dalaman sahaja diperlukan. Hasilnya adalah sebuah sistem yang ringkas, murah dan dapat dipercayai. Setelah prototaip penyongsang menggunakan pengawal mikro Siemens 80C167 telah dibangunkan dan beberapa hasil ujian diberikan. Kata kunci: Pengawal mikro; penyongsong; denyut modulasi lebar jalur; elektronik kuasa. This paper describes the use of a general purpose microcontroller to generate the pulse width modulation (PWM) pulses for a three–phase inverter. The main feature of the work is the simplicity of the hardware – only a fixed point microcontroller with its associated internal peripheral is required. This result in an extremely simple, low-cost and reliable system. A laboratory inverter prototype using a Siemens 80C167 microcontroller is developed and typical results are presented. Key word: Microcontroller; inverter; pulse width modulation; power electronics, renewable energy.


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