International Journal for Research in Applied Science & Engineering Technology (IJRASET) ISSN: 2321-9653; IC Value: 45.98; SJ Impact Factor: 7.429 Volume 9 Issue XI Nov 2021- Available at www.ijraset.com
Reduced Switches Count of Five Level H-bridge Inverter with Integrated Boost Converter in Solar PV System Dr. T. Murali Mohan1, CH. Pushpa Rani2 1, 2
Department of EEE, JNTUK, Kakinada, Andhra Pradesh, India
Abstract: PV systems are becoming more popular now a days, due to increase in the energy demand and it also reduces the environment pollution around the world. This paper proposes a reduced switches count of five-level H-bridge inverter with integrated boost converter in solar PV system. The proposed 5-level reduced switches count H-bridge MLI configuration requires less no.of power semiconductor devices compared to that of conventional MLI topology. In this paper INC MPPT control technique is used, which provides a duty ratio for controlling dc-dc boost converter and allowing the PV cells to operate more efficiently and extract maximum solar energy. The phase shifted sinusoidal pulse width modulation (PSCPWM) control technique is used for controlling the gating pulse of 5-level reduced switches H-bridge inverter. To improve the quality of PV based 5-level reduced switches h-bridge inverter output parameters mainly contribute switching losses and total harmonic distortion. The proposed model is modeled and simulated in MATLAB/SIMULINK software. Keywords: PV array, H-bridge multilevel inverter, boost converter, phase shifted PWM, maximum power point tracking (MPPT), incremental conductance, total harmonic distortion (THD). I. INTRODUCTION Now a day, photovoltaic energy is increasingly used because of its important benefits. In fact, this type energy ensures an electricity production without greenhouse gases emission. Besides, PV energy is totally flexible and can meet a wide range of needs [1-2].solar cells convert sunlight directly into electricity. They are made of semiconducting materials. A PV cell converts the solar energy into the electrical energy by the photovoltaic effect. When sunlight is absorbed by these materials, the solar energy knocks electrons loose from their atoms, allowing the electrons to flow through the material to produce electricity [3]. This process of converting light (photons) to electricity (voltage) is called PV effect. The size of a solar PV array, cells are stacked in a series–parallel configuration for required energy. PV array output voltage varies with change in irradiance and ambient conditions. Therefore, tracking the solar radiation is an important issue to increase efficiency of PV .An MPPT technique is used to extract maximum power available from the PV array under any operating conditions. Therefore, the maximum voltage from a PV array is produced using an MPPT control technique with a boost converter. Most important and famous MPPT methods are discussed by many researchers. Perturbations and observations (P&O) and incremental conductance [4].In solar PV power stations, a PV panel converts solar energy to DC electric power. This DC power is converted to the AC power by using inverter. Multilevel inverters have gained much attention in recent years as power converters in many applications, such as utility and large motor drives. They are advantageous over the conventional two-level inverters because of their capability to reduce lower order harmonic contents by increasing the number of levels [5], [6], [7]. However, having high number of levels lead to complex control algorithm and introduces voltage imbalance problems. Generalized structure of the multilevel inverters has been studied before [6] The most attractive features of multilevel inverters are as follows: 1) They can generate output voltages with extremely low distortion. 2) They can operate with a lower switching frequency 3) They generate smaller common-mode (CM) voltage, thus reducing the stress in the motor bearings [5], [8]. Multilevel topologies are divided into three types, they are diode clamped, flying capacitor and cascaded H- bridge multilevel inverter.
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