A five level cascaded H-bridge inverter based on space vector pulse width modulation technique (original) (raw)
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International Journal of Electrical and Computer Engineering (IJECE), 2018
This paper presents a simplified control strategy of spacevector pulse width modulation technique with a three segment switching sequence and seven segment switching sequence for high power applications of multilevel inverters. In the proposed method, the inverter switching sequences are optimized for minimization of device switching frequency and improvement of harmonic spectrum by using the three most desired switching states and one suitable redundant state for each space vector. The proposed three-segment sequence is compared with conventional seven-segment sequence for five level Cascaded H-Bridge inverter with various values of switching frequencies including very low frequency. The output spectrum of the proposed sequence design shows the reduction of device switching frequency, current and line voltage THD, thereby minimizing the filter size requirement of the inverter, employed in industrial applications, where sinusoidal output voltage is required. 1. INTRODUCTION With ever increasing demand, of electrical energy and depleting fossil fuel reserves, the efficiency utilization of existing resources have become compelling requirement. High efficiency power electronic converter topologies with optimized control strategies are required to minimize the energy waste and improve the power quality. The design of controlled medium voltage drives is faced with challenges that relate to the topologies and control of the and motor side converters. The voltage and currents wave forms are effected by factors like topology used the control algorithm the filter size, choice of switching frequency and the application .The switching on of medium voltage semi conductor devices also make up the major part of device losses, their reduction allows the maximum output power while the other side the reduction of switching frequency causes the increased harmonic distortion of motor side waveforms. Thus the area need careful consideration for efficient drive system[1]. Multi level converter after many advantages like good power quality, low switching losses, high voltage capability, low dv/dt stress [2]. The three bench mark topologies for high power medium voltage applications are neutral point clamped, series cascaded H-bridge, flying capacitor converter cascaded H bridge VSC has been applied for high power and power quality industrial requirement due to it series expansion capabilities in industrial main applications include, active filter, reactive power compensation, electric vehicles photo voltaic power conversion, ups etc. this topology can be operated at different switching frequencies for different application [3]. The H-bridge is supplied by isolated d.c. sources, composed of multiphase diode rectifiers. Among the various switching algorithms. Proposed in the literature for multi level converters, SVM is the most
Optimized Space Vector Pulse-width Modulation Technique for a Five-level Cascaded H-Bridge Inverter
Journal of Power Electronics
This paper presents an optimized space vector pulse-width modulation (OSVPWM) technique for a five-level cascaded H-bridge (CHB) inverter. The space vector diagram of the five-level CHB inverter is optimized by resolving it into inner and outer two-level space vector hexagons. Unlike conventional space vector topology, the proposed technique significantly reduces the involved computational time and efforts without compromising the performance of the five-level CHB inverter. A further optimized (FOSVPWM) technique is also presented in this paper, which significantly reduces the complexity and computational efforts. The developed techniques are verified through MATLAB/SIMULINK. Results are compared with sinusoidal pulse-width modulation (SPWM) to prove the validity of the proposed technique. The proposed simulation system is realized by using an XC3S400 field-programmable gate array from Xilinx, Inc. The experiment results are then presented for verification.
International Journal of Electrical and Computer Engineering (IJECE), 2018
This paper presents a simplified control strategy of spacevector pulse width modulation technique with a three segment switching sequence and seven segment switching sequence for high power applications of multilevel inverters. In the proposed method, the inverter switching sequences are optimized for minimization of device switching frequency and improvement of harmonic spectrum by using the three most desired switching states and one suitable redundant state for each space vector. The proposed threesegment sequence is compared with conventional seven-segment sequence for five level Cascaded H-Bridge inverter with various values of switching frequencies including very low frequency. The output spectrum of the proposed sequence design shows the reduction of device switching frequency, current and line voltage THD, thereby minimizing the filter size requirement of the inverter, employed in industrial applications, where sinusoidal output voltage is required
Comparative Study Of SPWM And SVPWM Cascaded H-bridge Multilevel Inverter
Large electric drives and utility applications require modern power electronics converter like cascaded H-bridge multilevel inverter (CHB) with separated DC sources is clearly the most practical topology for use as a power converter for medium & high power applications due to their modularization and extensibility. The H-bridge inverter eliminates the large number of bulky transformers, clamping diodes and flying capacitors. Cascaded multilevel inverter (MLI) is contemplated to be suitable for medium & high power applications. There are many pulse-width modulation (PWM) techniques developed for controlling multilevel inverter, among these, SVM is the most popular one due to its simplicity both in hardware and software. But the SVM becomes very difficult to achieve when the levels increases. To simplify the SVM at high level, several improved methods have been proposed in many literatures. In this report, SPWM and SVPWM controlled cascaded H-bridge multilevel inverter for large motor drives is designed, analysed and compared with conventional inverter, by simulating in MATLAB simulink software. Keywords: 3 phase induction motor drives, H-bridge multilevel inverter, pulse-width modulation (PWM)
Implementation of Cascaded H Bridge Inverter Using Space Vector PWM
2014
The modulation and control strategies plays vital role to minimize THD in Multilevel inverter .The modulation technique includes Sinusoidal Pulse Width Modulation (SPWM), Selective harmonic Elimination and Space Vector Pulse Width Modulation (SVPWM).Multilevel inverters has tremendous application in the area of high-power and medium-voltage energy control. In this paper simulation of SVPWM is performed for cascaded H bridge inverter . Simulation of three level, five level and seven level cascaded H bridge inverter with Space vector PWM has been carried out. Implementation and simulation of SVPWM inverter are presented to realize the validity of the SVPWM technique.
Multilevel inverter is an effective and practical solution for increasing power demand and reducing harmonics of AC waveforms. Such inverters synthesize a desired output voltage from several levels of dc voltages as inputs. This paper analyzes the performance of cascaded five level inverter using hybrid pulse width modulation technique. It has been found that this technique reduces the switching losses and total harmonic distortion. The topology used in this technique reduces the number of power switches when compared to the conventional cascaded Hbridge multilevel inverter. The performance has been analyzed by the MATLAB/Simulink. The output shows better performance results.
Multilevel inverters are progressively being used in highpower medium voltage energy control industrial drive applications due to their superior performance compared to conventional two-level inverters. There are a number of topologies applied in recent years. The most widely applied topologies are Diode Clamped Inverter (DCLI), Capacitor Clamped Inverter (CCLI) and Cascaded H-Bridge Inverter (CHBI). Three level DCLI requires additional 6 clamping diodes and CCLI requires 3 clamping capacitors that make the system bulky and quite difficult to implement while increasing the number of level. CHBI requires no additional diodes or capacitors and it is easy to implement. But it requires 2 DC sources that increases the system cost. In this paper, these three topologies for three level inverter using space vector pulse width modulation (SVPWM) technique has been modelled and simulated using MATLAB/SIMULINK and Origin 6.1 for a passive R-L load. From the simulation results, CHBI with separate DC source (CHBISEDCS) shows the better performance to the others in terms of THD. CHBI using single DC (CHBISDC) source is also presented and compared with CHBISEDC. CHBISDC shows better performance without significant increase of THD compared to CHBISEDC. Hence CHBISDC minimizes the system cost and provides better performance.
Five Level Modified Cascaded H-Bridge Inverter
ICSESD-2017, 2017
This paper presents a cascaded H-bridge multilevel inverter for Electric Vehicle (EV) and Hybrid Electric Vehicle (HEV) application. These new type of inverter are suitable for the high power application due to that the synthesize waveform with better harmonics and output waveform. In this, two H-Bridge inverter are connected in series in which the second H-bridge inverter uses capacitor and this capacitor acts as a DC sources whenever the DC supply is absent the modified PWM techniques is to be developed to reduce the switching losses and also to reduce the total number of switches. To develop the model of the multilevel inverter, a simulation is done by using the MATLAB/SIMULINK software. Here, Sinusoidal Pulse Width Modulation (Phase Opposition Disposition) technique is adopted to obtain a distortion less output for asynchronous motor drives.
Novel 5 Level Cascaded H-Bridge Multilevel Inverter Topology
International Journal of Engineering Trends and Technoloy, 2015
This paper represents Novel 5 level cascade H-bridge multilevel inverter using only 6 switches and two DC power source. The main aim of this paper is to increase number of levels with Reduced Number of Switches and Sources at the output without adding any complication to the power circuit. The main aim of the novel topology is to decrease the lower whole harmonic distortion and high output voltage. In this paper pulse width modulation technique is used to implement this topology which can minimize the total harmonic distortion and enhances the output voltages. The hardware of multilevel Inverter circuits has been done using Proteus-7.8 software. An AVR (ATmega16) microcontroller is used to generate pulses for controlling the multilevel inverter circuit and result are show in DSO (digital Storage Oscilloscope).
ANALYSIS OF CASCADED H-BRIDGE MULTILEVEL INVERTER WITH LEVEL SHIFTED PWM ON INDUCTION MOTOR
Multi-level converter technology has emerged as a very important alternative in the area of high-power medium voltage energy control. Two level inverters are those which creates a voltage or a current with levels either 0 or ±V dc. To achieve an eminence output voltage or a current waveform with a lowest amount of ripple content, they need high switching frequency. When working at high frequency, high power and high voltage applications these two level inverters have a few restrictions. The multi-level inverter is to produce a quasi sinusoidal voltage from many levels of dc voltages. The obtained output waveform has more steps, which creates a staircase wave form that reaches to a preferred wave form, as the number of levels increases. By the on and off the power switches a sequence of pulses can be produced by using SPWM or sinusoidal pulse width modulation technique which is widely used in power electronics. Sinusoidal pulse width modulation is widely used in many industrial applications and also used for so many years and it is characterized by constant amplitude pulses with dissimilar duty cycle for every period because of its circuit ease and strong control mechanism. To minimize the harmonic content and to control the output voltage of inverter the width of this pulses are modulated. Many PWM techniques are present to regulate the motor, but out of that Sinusoidal pulse width modulation or SPWM is the typically used scheme in motor control and inverter application. Finally a unipolar and bipolar SPWM voltage modulation technique is proposed because this method offers the benefit of successfully doubling the switching frequency of the inverter voltage, thus creating the output filter smaller, economical and trouble free to implement.