Modulation Waveform Cycle Normalization Based Unipolar SPWM Controller

2013 ◽  
Vol 791-793 ◽  
pp. 681-685
Author(s):  
Chao Jiang ◽  
Yue Li Hu ◽  
Ke Ke Zhang ◽  
Yang Cao
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Design Method ◽  
Practical Significance ◽  
The Novel ◽  
Sinusoidal Modulation ◽  
Sinusoidal Pulse Width Modulation ◽  
Novel Design

The thesis mainly proposed a novel design method for Sinusoidal Pulse Width Modulation (SPWM) controller based on modulation waveform cycle normalization. T is the period of sinusoidal modulation waveform, and T/n is the cycle of triangular carrier. Shift registers and adders of SPWM controller were designed to translate the 2n numerical value for SPWM waveform on-off switching points, which were calculated offline, to control the level of the outpout SPWM waveform,which is the key point of modulation waveform cycle normalization. In the thesis RTL function simulation verification by ModelSim and testing for FPGA have been achieved successfully. The results show that the novel SPWM controller is reliable, which has practical significance.

scholarly journals Method for reducing the amplitudes of higher harmonics in the output voltage of the frequency converter

2021 ◽  
Vol 29 (1) ◽  
pp. 120-132
Author(s):  
Alexsandr V. Starikov ◽  
Sergey L. Lisin ◽  
Olga S. Belyaeva ◽  
Viktor A. Kirdyashev
Keyword(s):  
Pulse Width ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Dead Time ◽  
Frequency Converter ◽  
Higher Harmonics ◽  
Sinusoidal Modulation ◽  
Power Transistors ◽  
Switching Power ◽  
Sinusoidal Pulse Width Modulation

Modern low-voltage frequency converters, built on the principle of stand-alone inverters with pulse-width modulation, have large amplitudes of higher harmonics in the output voltage. This adversely affects the operation of an asynchronous or synchronous motor connected to such a converter, since it causes a decrease in the efficiency of the AC machine. The analysis of the reasons for the poor harmonic composition of the output voltage of traditional inverters with sinusoidal pulse-width modulation is carried out and it is noted that the main one is the introduction of "dead" time when switching half-bridges every modulation period. The proposed method of sinusoidal modulation does not require the introduction of "dead" time. The modes of operation of power transistors with this switching method and control signal diagrams are considered. Analytical expressions are found that make it possible to determine the effective value of the output voltage of the frequency converter and the coefficients of higher harmonics for the proposed method of switching power transistors. The main reason for the low effective value of the phase voltage at the output of the inverter at sinusoidal pulse-width modulation is determined - the ineffective use of the switching period. The proposed method of sinusoidal modulation does not require the introduction of "dead" time, increasing the effective value of the output voltage and reducing the total harmonic component by 75 times. The diagrams of signals that control power transistors and provide a decrease in the amplitudes of higher harmonics at the output of the frequency converter are given. An approximation by the harmonic Fourier series of the output voltage of the inverter, obtained in the case of using the proposed method of switching power transistors, is made. It is noted that for the technical implementation of sinusoidal modulation, which provides small amplitudes of higher harmonics, only two pulse-width modulators are needed.

Space Vector and Sinusoidal Pulse Width Modulation of Quasi Z-Source Inverter for Photovoltaic System

2016 ◽  
Vol 7 (3) ◽  
pp. 601 ◽  
Author(s):  
G. Prakash ◽  
C. Subramani
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Photovoltaic System ◽  
The Novel ◽  
Matlab Simulation ◽  
Space Vector ◽  
Course Of Action ◽  
Dc Current ◽  
Sinusoidal Pulse Width Modulation ◽  
The Way

<p>This paper compares the execution of Sinusoidal Pulse width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVM) methods for a Quasi Z-source inverter (QZSI) is an another topology got from the standard Z-source inverter (ZSI).The QZSI gets each one of the upsides of the ZSI, which can comprehend buck/boost, inversion and power forming in a singular stage with upgraded trustworthiness. In like manner, the proposed QZSI has the novel purposes of enthusiasm of lower part evaluations and unfaltering dc current from the source. The QZSI highlights a broad assortment of voltage expansion which is reasonable for applications in photovoltaic (PV), as a result of the way that the PV cells yield contrasts comprehensively with temperature and daylight based enlightenment. The working qualities of the proposed course of action is analyzed in inconspicuous component and appeared differently in relation to that of the SPWM and SVM. Speculative examination of voltage help and direction methods for the QZSI in PV is explored in this paper. Amusement of the circuit setup for the previously stated equalization procedures have been taken a gander at in MATLAB/Simulation. Besides, the THD examination of both SPVM and SVM is compared.</p>

scholarly journals PERANCANGAN AUTOMATIC VOLTAGE REGULATOR (AVR) BERBASIS PENGATURAN TEGANGAN CATU DAYA ARUS SEARAH INVERTER 1 FASE SINUSOIDAL PULSE WIDTH MODULATION (SPWM) SINEWAVE

TRANSIENT ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 334
Author(s):  
Yoshua Habibnur ◽  
Agung Windarta ◽  
Iwan Setiawan
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Voltage Regulator ◽  
Automatic Voltage Regulator ◽  
Sinusoidal Pulse Width Modulation

Indonesia ternyata tidak sepadan dengan kualitas listrik yang diberikan oleh PT. PLN. Tegangan PLN paling rendah yaitu 170 V yang terdapat di beberapa kota. Tidak tercapainya rating tegangan dapat menyebabkan peralatan elektronik tidak bekerja secara maksimal dan berpotensi mengalami kerusakan. Salah satu tujuan penelitian ini yaitu merancang sebuah konverter sebagai solusi dari permasalahan jatuh tegangan dan kestabilan tegangan, yaitu automatic voltage regulator (AVR) menggunakan inverter 1 fase teknik pemicuan sinusoidal pulse width modulation (SPWM) dengan pengaturan tegangan DC. Topologi pengatur tegangan DC yang digunakan adalah DC chopper buck-boost teknik pemicuan pulse width modulation (PWM) dengan umpan balik di sisi keluarannya.  Perancangan dilakukan berdasarkan ketentuan literatur terkait, simulasi PSIM 9.0 dan MATLAB 2014a. Konverter dengan sistem AVR diharapkan dapat mencapai tegangan rating dan stabil pada level 207 – 241 V sesuai standar SPLN 1:1995. Berdasarkan hasil pengujian variasi tegangan sumber dari 170 – 200 V dengan sistem AVR, konverter dapat mencapai tegangan rata – rata pada sisi DC dan AC berturut – turut sebesar 229,5 V dan 228,56 V dengan frekuensi rata – rata 50,25 Hz. Efisiensi rata –rata yang dapat dicapai oleh konverter sebesar 72,02% pada kondisi sistem AVR bekerja.

scholarly journals A Topology Synthetization Method for Single-Phase, Full-Bridge, Transformerless Inverter with Leakage Current Suppression Part I

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 434 ◽  
Author(s):  
Xiumei Yue ◽  
Hongliang Wang ◽  
Xiaonan Zhu ◽  
Xinwei Wei ◽  
Yan-Fei Liu
Keyword(s):  
Leakage Current ◽  
Pulse Width ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Circuit Model ◽  
Double Frequency ◽  
Highly Efficient ◽  
Sinusoidal Pulse Width Modulation ◽  
Derivation Procedure ◽  
Bridge Topologies

Single-phase full-bridge transformerless topologies, such as the H5, H6, or the highly efficient and reliable inverter concept (HERIC) topologies, are commonly used for leakage current suppression for photovoltaic (PV) applications. The main derivation methodology of full-bridge topologies has been used based on both a DC-based decoupling model and an AC-based decoupling model. However, this methodology is not suited to the search for all possible topologies, and cannot verify whether they are inclusive. Part I of this paper will propose a new topology derivation methodology based on unipolar sinusoidal pulse width modulation (USPWM) to search all possible full-bridge topologies for leakage current suppression. First of all, a unified circuit model is proposed, instead of the DC- and AC-based models. Secondly, a mathematic method called the MN principle is then proposed to search for all possible topologies, and a derivation procedure is provided. It was verified that all existing topologies could be found using the proposed method; furthermore, seven new topologies were derived. The proposed topology derivation methodology is extended to search topologies under Double-Frequency USPWM (DFUSPWM). Twenty topologies under USPWM and four topologies under DFUSPWM have been derived.

Sign in / Sign up

Export Citation Format

Share Document