研究目的
To propose a reliable and efficient PV-powered water pump using a modified SEPIC converter with high static gain and an improved P&O MPPT technique for better performance under varying environmental conditions.
研究成果
The proposed system demonstrates high efficiency and reliability for solar-powered water pumping, with the modified SEPIC converter providing low stress and high gain, and the improved MPPT technique ensuring effective power tracking and flow rate regulation. Experimental results confirm satisfactory performance under varying conditions, making it a viable solution for off-grid applications.
研究不足
The system is tested in a laboratory setting with a PV simulator, not real outdoor conditions. It may have limitations in scalability for larger power applications. The improved MPPT technique, while reducing deviation, might still have minor inefficiencies under rapid environmental changes. The use of specific components (e.g., SRM) may not be cost-effective for all scenarios compared to other motor types.
1：Experimental Design and Method Selection:
The system uses a modified SEPIC converter for DC-DC conversion, operating in continuous inductor current mode (CICM) to minimize stress and improve efficiency. An improved P&O MPPT algorithm is implemented to track maximum power point with reduced deviation and tracking time. The SRM drive is controlled via PWM of a mid-point converter using Hall-Effect position sensors and a PI controller for DC link voltage regulation.
2：Sample Selection and Data Sources:
A PV array simulator is used to emulate a 1.4 kW PV array. The SRM is a 4-phase, 8/6 configuration rated at 1.2 kW, 1500 rpm. Data on voltage, current, power, and speed are collected under various irradiance levels (e.g., 600 W/m2 to 1000 W/m2) and temperatures.
3：4 kW PV array. The SRM is a 4-phase, 8/6 configuration rated at 2 kW, 1500 rpm. Data on voltage, current, power, and speed are collected under various irradiance levels (e.g., 600 W/m2 to 1000 W/m2) and temperatures.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: PV simulator, modified SEPIC converter components (inductors L1 and L2, capacitors C1, C2, CPV, CDC1, CDC2, switches, diodes), SRM drive, mid-point converter, DSP-dSPACE 1202 MicroLabBox for control implementation, digital storage oscilloscope (Agilent DSO-7014A), Hall-Effect sensors, and resistive load for emulating water pump.
4：Experimental Procedures and Operational Workflow:
The system is started with an initial duty cycle of 0.1 for soft starting. MPPT controller adjusts duty cycle based on PV voltage and current changes. DC link voltage is regulated via PI controller. PWM signals are generated and combined with position sensor signals. Performance is tested under steady state and dynamic conditions with varying irradiance and temperature.
5：1 for soft starting. MPPT controller adjusts duty cycle based on PV voltage and current changes. DC link voltage is regulated via PI controller. PWM signals are generated and combined with position sensor signals. Performance is tested under steady state and dynamic conditions with varying irradiance and temperature.
Data Analysis Methods:
5. Data Analysis Methods: Data on VPV, IPV, PPV, VDC, speed, and other parameters are captured using the oscilloscope. MPPT efficiency is calculated, and system performance is analyzed through tabulated results and waveform observations.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
