BLDC Motor Driven Solar PV Array with Battery Fed Automatic Irrigation System Employing Zeta Converter

Objective

The main objective behind this project is to design a simple, cost effective and efficient brushless DC (BLDC) motor drive for solar photovoltaic (SPV) array fed water pumping system. The project includes automatic changeover circuit to switch power source between solar panel and battery based on the presence and absence of light. The pump works on the signals received by the sensors used for automatic irrigation system.

Abstract

This project proposes a simple, cost effective and efficient brushless DC (BLDC) motor drive for solar photovoltaic (SPV) array fed water pumping system. A zeta converter is utilized in order to extract the maximum available power from the SPV array. The proposed control algorithm eliminates phase current sensors and adapts a fundamental frequency switching of the voltage source inverter (VSI), thus avoiding the power losses due to high frequency switching. No additional control or circuitry is used for speed control of the BLDC motor. The speed is controlled through a variable DC link voltage of VSI. An appropriate control of zeta converter through the incremental conductance maximum power point tracking (INC-MPPT) algorithm offers soft starting of the BLDC motor. The proposed irrigation system is designed and modeled such that the performance is not affected under dynamic conditions. The suitability of proposed system at practical operating conditions is demonstrated through an experimental validation. The SPV array charges the battery as well as runs the motor during day time. When there is no supply from SPV, the motor is powered by the battery bank. The running period of motor is controlled and executed by soil moisture control system.

Future scope

The prototype of this project is designed to supply power to water irrigation pump. This project can be further developed by increasing the rating of certain components to power up an individual home or a community. The H – Bridge based VSI inverter can be replaced by 3 phase inverters to enable it work in grid tie inverter. This system is efficient to work on on-grid as well as off-grid also. Further by increasing the capacity of solar panel and batter we can increase the rating of the system.

Existing System.

The existing literature exploring SPV array based BLDC motor driven water pump is based on a configuration shown in Fig. A DC-DC converter is used for MPPT of a SPV array as usual. Two phase currents are sensed along with Hall signals feedback for control of BLDC motor, resulting in an increased cost. The additional control scheme causes increased cost and complexity, which is required to control the speed of BLDC motor. Moreover, usually a voltage source inverter (VSI) is operated with high frequency PWM pulses, resulting in an increased switching loss and hence the reduced efficiency. However, a Z-source inverter (ZSI) replaces DC-DC converter in, other schematic of Fig. remaining unchanged, promising high efficiency and low cost. Contrary to it, ZSI also necessitates phase current and DC link voltage sensing resulting in the complex control and increased cost.

DRAWBACKS:

·         There is no dynamic response.

·         High Total Harmonic Distortion (THD).

PROPOSED SYSTEM:

          Proposed SPV array fed water pumping system with an incremental conductance (INC) MPPT algorithm is used to operate the zeta converter such that the SPV array always operates at its MPP and the BLDC motor experience a reduced current at the starting. A three-phase voltage source inverter (VSI) is operated by fundamental frequency switching for the electronic commutation of BLDC motor. Simulation results using MATLAB/Simulink software is examined to demonstrate the starting, dynamics and steady state behavior of the proposed water pumping system subjected to the random variation in the solar irradiance. The SPV array is designed such that the proposed system always exhibits satisfactory performance regardless of the solar irradiance level or its variation.

ADVANTAGES:

·         Belonging to the family of buck-boost converters, the zeta converter can be operated either to increase or to decrease the output voltage.

·         The aforementioned property also facilitates the soft starting of the BLDC motor unlike a boost converter which habitually step-up the voltage level at its output, not ensuring the soft starting.

·         Unlike a simple buck-boost converter, the zeta converter has a continuous output current. The output inductor makes the current continuous and ripples free.

·         reduces the complexity and probability of slow down the system response

APPLICATIONS:

·         Household applications and industrial usage.

·         Solar photovoltaic (spv) generated electrical energy applications

    For more information  regarding hardware and software model contact 

    email id : debrajnath230@gmail.com

     ph no : +919435240870