IOT Based Water Quality Management System Using Nodemcu

Description

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Objective:

To design the New Single-Stage Transformer less Inverter for Photovoltaic Applications

Existing system:

In conventional inverters, the voltage of DC link should be greater than the peak voltage of the utility grid. Since the output voltage of PV modules is not high enough, a DC-DC boost converter is used in cascade with the inverter for PV applications. The DC-DC converter boosts the output voltage of PV module and guarantees that the PV module operates at maximum power point (MPP). Although these two stage topologies are simple, they suffer from low efficiency. Moreover, the added DC-DC boost converter may increase inverter size and cost. The current trend is towards the reduction of the power stages. Grid connected inverters can be classified into two main groups: with or without galvanic isolation. Galvanic isolation increases the inverter safety at the cost of overall efficiency degradation. Although this inverter has almost solved the zero crossover distortion problem, it has drawbacks like high switching losses and complicated control scheme.

Dis-advantages:

  • High switching losses
  • Large size & high cost
  • Components count is high

Proposed system:

In order to overcome the shortcomings mentioned above, a new single-stage inverter is proposed in this project. The proposed topology is an integration of a high step-up converter proposed in and a half bridge inverter. The proposed inverter has only one high frequency active switch operating during each half cycle of the output voltage. This feature increases efficiency of the system by decreasing gate drive and switching losses. Furthermore, the zero crossover distortion problem is almost solved and the total harmonic distortion (THD) of the proposed inverter is lower than 3%. The proposed topology can be simply controlled by pulse width modulation (PWM) technique. The inverter operates in discontinuous conduction mode (DCM).

Tools:

  • MATLAB

Advantages:

  • Low switching losses
  • High efficiency & small size
  • Low THD value

Applications:

  • Distributed generation
  • Grid connected system
  • PV applications

Conclusions:

In this project is suitable for PV application is proposed. Due to omitting galvanic isolation, the cost, size and weight of the system is reduced. Simple structure, low switching losses and easy control scheme are the main features of the presented inverter. Simulation and experimental results demonstrates the high performance of the proposed system. Due to boosting ability and achieving low-voltage THD, this topology is suitable for PV grid connected systems.

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