International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 10 | Oct 2022
p-ISSN: 2395-0072
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Solar Operated BLDC Drive for Agriculture Purpose Rani Yuvraj Raut1, S V Murkute2 1PG
Student Electrical Power System, at P.E.S College of engineering Aurangabad. Electrical Power System, at P.E.S College of engineering Aurangabad. ---------------------------------------------------------------------***--------------------------------------------------------------------2Professor,
Abstract - This paper deals with the development of a solar
from the grid in case the PV array is unable to meet the required power demand; otherwise the PV array is preferably used. To enable a power transfer from the utility grid to the DC bus, a DC-DC buck-boost converter is used as an intermediate converter. An amount of the power required to be transferred is governed through an appropriate control of power flow.
photovoltaic (PV) based reliable water pumping system. An uninterrupted and full volume of water delivery and hence the reliability is ensured by providing a continuous power grid support to the PV generation unit which is installed for the water pumping. The water pump is powered by a brushless DC (BLDC) motor drive with high efficiency and reduced sensor based. The power transfer from the utility grid to the common DC bus is enabled through controlling a power factor corrected (PFC) buck-boost converter. In order to make the control of the converter simple and cost-effective, it is operated in discontinuous conduction mode (DCM) which requires a single voltage sensing, and also offers an inherent power quality improvement in terms of total harmonic distortion (THD) and unity power factor (UPF). The applicability and reliability of the proposed scheme are demonstrated by the various simulated results using MATLAB/Simulink platform.
In addition to the power transfer, a secondary objective of the buck-boost DC-DC converter is to maintain the power quality (PQ) at the utility grid. Therefore, this is used as a power factor corrected (PFC) converter. The various PFC converter configurations for BLDC motor drive are broadly classified in [10]. Among the numerous topologies, a PFC buck-boost converter, possessing a minimum number of components is adopted in this work. Operating this converter in CCM (Continuous Conduction Mode) although leads to a reduced switching stress on its devices, it causes an increased number of sensing elements and complex control [11]. Therefore, in this work, it is operated in a discontinuous conduction mode (DCM) and controlled through a voltage follower approach, which need only one voltage sensor. Moreover, the DCM operation offers an additional benefit of inherent power factor correction at the power grid.
1. INTRODUCTION Reliability is a major concern of solar photovoltaic (PV) based water pumping. Due to the intermittency of PV generation, water pumping is severely interrupted and it is not possible at night. The demand for a continuous water delivery calls for a pumping system which is independent of the climatic condition. An external power source is obviously required to meet this demand. The so called external power backup may be battery energy storage (BES) or a utility power grid. The BES reduces the service life, and increases the installation cost and maintenance requirements [1]–[2]. To get over this complications with a battery technology, an alternate solution is reported in [3]–[5] wherein a utility grid is used as the backup in a PV based induction motor driven water pumping. These recently recognized technologies, in reality, interface a PV generating unit into a utility grid. The prime attention is to achieve an uninterrupted and full volume of water delivery irrespective of the climatic conditions, whether day or night. However, no such system with a brushless DC (BLDC) motor is developed or reported as of now.
The maximum power point (MPP) operation [9], [12]–[14] of the PV array is carried out using another buck-boost converter between the PV array and VSI (Voltage Source Inverter) which feeds the brushless DC motor-pump. However, this converter is operated in CCM to obtain a least switching stress on its components and devices. It is capable to operate as both boost and buck converters thus does not possess any sort of confinements on MPP tracking dissimilar to a boost or buck converter [6]. On the other hand, the BLDC motor is operated through an electronic commutation [6], [8]–[11]. A reduced sensor based speed control which obviates the phase current sensors is adopted for simplicity and cost benefit. In addition, in order to minimize the converter switching losses, a fundamental frequency switching of VSI is adopted. The proposed topology is designed and simulated in MATLAB platform, and its functionalities are tested to demonstrate the reliability.
The BLDC motor has gained a wide attention since last decade for PV based water pumping. The attractive merits of this motor drive include a high efficiency, high power density, high power factor, high torque/inertia ratio and compactness [6]–[8]. This work aims at the development of reliable water pumping with grid supported PV generation unit which feeds a BLDC motor-pump. The power is drawn
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2. PROPOSED SYSTEM The suggested grid-interfaced solar PV-based water pumping scheme. The BLDC motor-pump is supplied by a PV array via a DC-DC buck-boost converter and a VSI. The DC-
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