Design and Implementation of voltage source inverter

In the HV systems, the application of power inverters, there are many choices. These range from the very expensive to the least expensive with varying degrees of quality, efficiency and power output capabilities. High quality combined with high efficiency exists thought is often at a high monetary c

Project Title

Design and Implementation of voltage source inverter

Project Area of Specialization

Electrical/Electronic Engineering

Project Summary

In the HV systems, the application of power inverters, there are many choices. These range from the very expensive to the least expensive with varying degrees of quality, efficiency and power output capabilities. High quality combined with high efficiency exists thought is often at a high monetary cost.Our goal is to design the Voltage Source Inverter which seems to be lacking in the power inverter market and applications one for a fairly efficient, inexpensive inverter with a pure sine wave output aimed at powering domestic appliances in the event of power outages and energy crisis.

The power supply circuit topology of the three-phase six-switch bridge inverter adopts six switching device designs. The branch of an inverter consisting of two back-to-back electronic switches (such as SCR’s, Thyristors, MOSFET, IGBT and GTO) depends according to the application. There are three conduction modes of an inverter.

1.180 ? Mode ofConduction

2.120 ? Mode of Conduction

The output of the inverter is a three-phase balanced output. The control signal is applied to the gating terminal. Three-phase voltage source inverter uses DC power source as power source input and convert it into alternating current by using the control signal to the gate terminal.

Project Objectives

The major objective of our work is to study different inverter topologies and design the prototype of Voltage source inverter

• Study and comparison of different inverter topologies

• Design and implementation of 6 pulse voltage source inverter (Simulation and Hardware).

Project Implementation Method

The methodology that will be used for the design of Voltage Source Invertor

• Theoretical approach

• Simulation

• Hardware implementation

• Stability Study

To modify the form of electrical energy (that is, modify its voltage, current, or frequency), you can find power electronics converters. Therefore, their power ranges from a few watts (such as mobile phones) to several hundred megawatts (such as HVDC transmission systems). Using “classical” electronic components, current and voltage are used to transmit information, while power electronics are used to carry power. Therefore, the main indicator of power electronics is efficiency.

The inverter is a circuit that converts DC power to AC power of a desired output voltage and frequency. The AC output voltage can be a fixed or variable voltage and frequency. This conversion can be achieved by controlling turn-on and turn-off devices (such as SCRs, Thyristors, BJT, MOSFET, IGBT, MCT, etc.) or force-commutated thyristors, depending on the desired application. The ideal inverter output voltage waveform should be sinusoidal. However, the actual inverter voltage waveform is non-sinusoidal and contains some harmonics. For low- and medium- power applications, square-wave or quasi-square-wave voltages may be acceptable, while for high- power applications, low-distortion, sinusoidal waveforms are required. The output frequency of the inverter is determined by the rate at which the semiconductor device is turned on and off by the inverter control circuit, so it is easy to provide an adjustable frequency AC output. With the switching technology of a variable high-speed power semiconductor device, the harmonic content

of the output voltage can be minimized or significantly reduced.

The DC power input to the frequency converter may be a battery, a fuel cell, a solar cell, or other DC power source. But in most industrial applications it is powered by a rectifier. This configuration of AC-DC converters and DC-AC inverters is referred to as DC link rectification at the grid frequency, then filtered in the DC link, and then converted to AC power at an adjustable frequency.

Benefits of the Project

The shortage of energy is the real crisis we are confronting nowadays in Pakistan. It 

has developed a desire to consider more reliable and proficient techniques for the power 

transmission. As the power flow control is extremely troublesome in AC frameworks, so 

the transfer of energy is done over long distances with less power losses utilizing HVDC 

links. HVDC system provides a reliable method for connecting two asynchronous system 

and to transfer bulk power considering these applications NTDC has joined hands with 

private energy generation companies to overcome the shortfall of energy and laid 878 

KM long 660 KV HVDC line from Matiari to Lahore having the capacity to transmit 

the power of 4000 MW. 

The main focus of our project is to analyze the effect of different faults and power control 

between the terminals under steady state and transient operation, in HVDC lines being 

laid in Pakistan using the simulation software Power System Simulation for Engineers 

(PSS/E) and to compare the results with National Transmission and Dispatch Com- 

pany(NTDC) studies. Moreover, different HVDC inverter topologies are studied and 

compared but conventional HVDC 6 pulse Voltage Source Converter topology is imple- 

mented and simulated to understand the concept of HVDC more deeply. The proposed 

inverter topology reduces the amount of harmonic currents drawn from the utility lines 

and gives excellent performance in case of unbalancing in the practical power systems 

with much less components as compared to other 6 pulse inverter topologies. Hence, 

HVDC transmission system is feasible technically for long distances transmission and 

had better power handling capability.

Technical Details of Final Deliverable

To modify the form of electrical energy (that is, modify its voltage, current, or frequency), you can find power electronics converters. Therefore, their power ranges from a few watts (such as mobile phones) to several hundred megawatts (such as HVDC transmission systems). Using “classical” electronic components, current and voltage are used to transmit information, while power electronics are used to carry power. Therefore, the main indicator of power electronics is efficiency.

The inverter is a circuit that converts DC power to AC power of a desired output voltage and frequency. The AC output voltage can be a fixed or variable voltage and frequency. This conversion can be achieved by controlling turn-on and turn-off devices (such as SCRs, Thyristors, BJT, MOSFET, IGBT, MCT, etc.) or force-commutated thyristors, depending on the desired application. The ideal inverter output voltage waveform should be sinusoidal. However, the actual inverter voltage waveform is non-sinusoidal and contains some harmonics. For low- and medium- power applications, square-wave or quasi-square-wave voltages may be acceptable, while for high- power applications, low-distortion, sinusoidal waveforms are required. The output frequency of the inverter is determined by the rate at which the semiconductor device is turned on and off by the inverter control circuit, so it is easy to provide an adjustable frequency AC output. With the switching technology of a variable high-speed power semiconductor device, the harmonic content

of the output voltage can be minimized or significantly reduced.

The DC power input to the frequency converter may be a battery, a fuel cell, a solar cell, or other DC power source. But in most industrial applications it is powered by a rectifier. This configuration of AC-DC converters and DC-AC inverters is referred to as DC link rectification at the grid frequency, then filtered in the DC link, and then converted to AC power at an adjustable frequency.

Experimental Setup

Expected OUTCOME

Figure. Expected Outcome

 

 

 

 

Final Deliverable of the Project

Hardware System

Core Industry

Energy

Other Industries

Core Technology

Clean Tech

Other Technologies

Sustainable Development Goals

Affordable and Clean Energy, Industry, Innovation and Infrastructure, Climate Action

Required Resources

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