Abstract
This paper presents the design of a fuzzy-logic-based voltage-regulated solar power maximum power point tracking (MPPT) system for applications involving hybrid power systems. The system contains a solar power system and battery as the primary and secondary power sources, respectively. The solar system alone supplies power to the electric motor and maintains the output voltage at a predetermined level when it has sufficient power. When the solar power is insufficient, the solar system is operated at its maximum power point (MPP) and the battery is engaged to compensate for the insufficiency. First, a variant of the incremental conductance MPP condition was established. Under the MPP condition, the voltage-regulated MPPT system was formulated as a feedback control system, where the MPP condition and voltage regulation requirements were used as the system inputs. Next, a fuzzy controller was developed to perform the voltage-regulated MPPT function for the hybrid power system. A simulation model based on Matrix laboratory (MATLAB)/SIMULINK (a block diagram environment for multi-domain simulation and model-based design) and a piecewise linear electric circuit simulation (PLECS) tool for controlling the dc motor velocity was developed to verify the voltage-regulated solar power MPPT system.
Highlights
Depending on specific mission objectives and performance requirements, unmanned aerial vehicles (UAVs) can be equipped with cameras, sensors, communications equipment, and other payloads
The range of the sum was confined to 90° to 270°; the voltage-regulated maximum power point tracking (MPPT) system was formulated as a feedback control system with two reference inputs (i.e., 180° as the reference for the MPPT function and a reference voltage for the desired output voltage)
The results demonstrated the success of the proposed fuzzy controller design for the voltage-regulated MPPT system
Summary
Depending on specific mission objectives and performance requirements, unmanned aerial vehicles (UAVs) can be equipped with cameras, sensors, communications equipment, and other payloads. For continuous operation and safety considerations, hybrid power systems are typically designed to power electric motors for a long endurance UAV. The MPPT and voltage regulation functions are integrated into a single standard feedback control system that requires only one power converter. With this standard feedback formulation, the efficiency of the solar energy is increased, but design and implementation of the real time control system is simpler. When the PV system supplied sufficient power for system operation, the output of the PV system was adequately regulated at the designated voltage without drawing power from the battery. The design and simulations of the voltage-regulated MPPT system are detailed
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