Hybrid type Solar Pump controller ranging from 20-80 HP capacities:
Kinetica Solar Pvt Ltd. is developing large capacity hybrid type solar pump controller with grid feeding features. The capacity of system covered under this project is 30Hp to 80Hp. The aim of the project is to full fill the requirement of Kerala’s water pumping for irrigation and convert large capacity grid water pumps into multichannel based solar water pump ranging from 30Hp to 80Hp. MNRE has announced deployment of over lakh SPV water pumping systems, however, the available solar pump controllers are not designed for large capacity and these conventional controllers suffer with many shortcomings. Therefore, there is an immediate need to develop the large capacity solar pump controller to provide solar connectivity to existing slip ring type turbine based large capacity water pumps. Accordingly, the major objectives of the project are:
- To develop controllers for 30Hp, 40Hp, 50Hp, 60Hp and 80Hp capacity agriculture SPV pumps.
- To develop the controller consisting of very high MPPT efficiency (>99%) and PCU which drive Motor and Pump through high power quality output voltage.
- To optimize the water discharge using high MPPT and conversion efficiency of the PCU and to ensure long run performance using Multichannel port concept by reducing partial shading, module mismatch and string bypass possibility.
- To ensure high quality electricity at the motor terminal for existing motor-pump set with THD < 5%, no voltage spikes, pure sine wave of input voltage and reliable V/F ratio.
- To make fully automatic manual starting mechanism of large capacity slip ring based water pumps.
- The controllers will be tested and deployed in field as a pilot project for their suitability to the available large capacity irrigation motor pump sets installed in the Kerala.
- To provide data logging and energy monitoring for self- investigation of controller and for solar energy mapping across the India.
Project in brief:
1. To design the whole system around a 570 V DC bus, to which the output of the solar MPPT, storage battery terminals, input side of the grid tied inverter and output of an AC to DC converter would be connected.
2. To de-segregate the solar MPPT section and VFD section so that we have access to the DC link
3. To drive the motor always through the VFD and avoid the resistive starter mechanism, which will be ease of operation to the farmers.
4. For the above function, even if the motor is drawing power from the grid, first convert it to DC using a converter and feed the power to the DC bus and through the DC bus, to the VFD.
5. When the motor is not working and if there is generation, the power fed into the DC bus can be pumped into the grid using a grid tied inverter. If possible, avoid the MPPT and DC power conditioning section of the grid tied inverter
The Advantages of the above mentioned system are:
1. The motor is always soft started by inverter and thereby avoid trouble for the farmers
2. The utilization factor of the inverter associated with motor-pump is enhanced.
3. De-segregation of functionalities give more choice of component selection.
4. Battery bank if provided gives option to operate even during night and during grid failures.
5. Redundant cost on MPPT and DC power conditioning can be limited, if we can find grid tied inverted manufacturers who can provide only the grid feeding section.