A Study On Hybrid System

Hybrid vehicles are continuously gaining popularity in the general public. With the growing societal concerns about green revolution and also achieving significant reduction in fuel consumption, hybrid vehicles are considered satisfactory in performance. They have become so popular that certain tax incentives have been offered by the government on hybrid vehicles. Due to their better performance compared with gas powered vehicles, we present the thesis of our paper as follows:

A Novel Soft Switching of Multi Level DC-DC Converter Fed DC Motor Drive Using PV Source

Fig. 11 shows a comparison of DPWM2O, DPWMLPF2 and GDPWMO at 0.4 modulation index. The inverter is operating with 160 Hz fundamental frequency and 7.68 kHz switching frequency. The output power factor angle is 45°. It can be seen that each strategy produces 32 pulses in one cycle. However, the clamping interval of the GDPWMO strategy is perfectly aligned with the line current peaks, whereas the DPWM2O and DPWMLPF2 strategies incurs switching instances around the current peaks.

The innovative inverter technology produces safe, smooth power, protecting your sensitive electronics (computers, smartphones, etc.) from damage.

Firstly the hybrid HVDC transmission system configuration is given. Next MMC description is given and then the control strategies for the rectifier and inverter is presented. Finally the performance of system under steady state and transient conditions is discussed with the help of MATLAB results.

Simulation of the proposed converter & the results using MATLAB & Simulink can be seen in this

Space Vector PWM (SVPWM) refers to a special switching sequence of the upper three power transistors of a three-phase power inverter. It has been shown to generate less harmonic distortion in the output voltages and or currents applied to the phases of an AC motor and to provide more efficient use of supply voltage compared with sinusoidal modulation technique. The biggest difference from other PWM methods is that the SVPWM uses a vector as a reference. This gives the advantage of a better overview of the system.

Abstract—This paper covers the need and use of power electronics in the application of renewable energy utilization. Covered in this paper is wind energy with variable speed drives and their controlling power electronics. Solar energy, specifically photovoltaics and their controlling power electronics. High-voltage direct current transmission lines and the power electronics that allow for this technology to exist.

Power electronic converters, especially DC/AC inverters have been extending their range of use in industrial application because they provide better system efficiency, reduced energy consumption and improved quality of power. The output voltage of inverter could be fixed or variable at a fixed or variable frequency and output waveforms are therefore made up of discrete values, producing fast transition rather than smooth ones [2]. The ability to

For the last 25 years there has been a great increase in the usage of the solid state electronics technology. This new technology has provided us with the opportunity to have a product with a high quality with an increased productivity due to its high efficiency. Today, we can produce products with high quality at less cost than in the last years, but this new technology has given rise to a new problem, which is the need for a clear electric power.

Option 1: Continue with existing 3-pronged strategy and expand operations within the Australian market to focus on hybrid/autonomous technologies

This report aims to discuss the working of DC-AC converter for photovoltaic systems and how it has been implemented to convert renewable energy into usable power to be supplied to the load (power supply application).A topology of a two-stage DC-AC converter has been designed in which a boost converter and a full bridge inverter act as an interface between the photovoltaic (PV) array and the power supply applications. A controlled strategy called Maximum Power Point Tracking (MPPT) technique has been used for achieving maximum power output at the load. Various modes of operation of the converter and the inverter are also discussed. MATLAB Simulink environment has been used for designing the circuitry and to observe various waveforms related to the output.

Brushless DC (BLDC) motors are used for many low and medium power drives applications due to their high efficiency, high flux density per unit volume, low maintenance requirement, low EMI problems, high ruggedness and a range of speed control. The commutation in PMBLDCM is accomplished by solid state switches of a three phase voltage source inverter (VSI). There is a necessity of an improved power quality (PQ) as per the

ABSTRACT: -- In this a fuzzy logic control technique has been proposed for power quality improvement by using UPQC The UPQC is controlled to regulate the WF terminal voltage, and to mitigate voltage fluctuations at the point of common coupling (PCC), caused by system load changes and pulsating WF generated power, respectively. In order to reduce the voltage fluctuations that may cause “flicker”, and improve WF terminal voltage regulation, several solutions have been posed. The voltage regulation at WF terminal is conducted using the UPQC series converter, by voltage injection “in phase” with PCC voltage. On the other hand, the shunt converter is used to filter the WF generated power to prevent voltage fluctuations, requiring active and reactive power handling capability. The sharing of active power between converters is managed through the common DC link. A customized internal fuzzy logic control scheme of the UPQC device was developed to regulate the voltage in the WF terminals, and to mitigate voltage fluctuations at grid side. Simulation results show the effectiveness of the proposed compensation strategy for the enhancement of Power Quality.

In the region of high voltage and power, a high quality inverter fed ac drive is more easily obtained by the use of multi-level and in the first turn of three-level - inverters. The neutral point clamped three-level inverter topology is presented in Figure.1. Several PWM methods for this inverter have