Novel Control Strategies For Photovoltaic Powered PMDC Motor Drives

Abstract

This paper presents a novel PID dual loop controller for a solar photovoltaic (PV) powered industrial type permanent magnet DC (PMDC) motor drive, which is modeled to include existing nonlinearities in motor plus load inertia (J) and viscous friction (B). The proposed dual loop includes a speed control as the dominant control loop and a supplementary motor current limiting loop as an auxiliary regulating loop to limit excessive high current and sudden current excursions. Alternative control approaches are used to ensure energy efficiency, stability and system reliability while maintaining operation flexibility. A type B DC-DC chopper is employed to control the power transferred from photovoltaic PV array to the PMDC motor. The performance of different dynamic controllers are simulated and validated in Matlab/Simulink GUI environment. All simulation models of PV array, DC-DC chopper, PMDC motor, interface filters, and the controllers are modelled using Matlab/Simulink/Sim-Power model block library.