研究目的
To study control strategies for three-phase grid-connected photovoltaic inverters to mitigate harmonic current output and improve grid power quality.
研究成果
The mathematical analysis and simulations demonstrate that the quasi-PR controller with harmonic compensation significantly reduces harmonic currents injected into the microgrid, improving power quality at the PCC. The proposed control strategy is effective under distorted grid voltages, showing superior performance compared to single-loop control and basic PR controllers. Future work could focus on experimental validation and optimization for broader grid conditions.
研究不足
The study is based on simulations in Matlab/Simulink, which may not fully capture real-world complexities such as component tolerances, environmental variations, or grid dynamics. The control strategies assume ideal conditions and precise parameter tuning, which could be challenging in practical implementations. Frequency shifts in the grid might affect the performance of PR controllers, and the quasi-PR controller's effectiveness depends on accurate harmonic identification.
1：Experimental Design and Method Selection:
The study involves mathematical modeling of a three-phase grid-connected PV system with an LCL filter using state-space equations and Clarke and Park transformations. Control strategies based on proportional resonant (PR) and quasi-proportional resonant (QPR) controllers are analyzed for harmonic mitigation.
2：Sample Selection and Data Sources:
A simulated three-phase AC microgrid is used, including components like PV arrays, energy-storage batteries, and microturbines. Parameters are derived from theoretical models and standard values.
3：List of Experimental Equipment and Materials:
The simulation uses Matlab/Simulink software for modeling and analysis. Specific hardware components are not detailed, but the model includes inverters with IGBT switches, LCL filters (inductors L1, L2, capacitors C2), and grid connections.
4：Experimental Procedures and Operational Workflow:
The simulation involves building the microgrid model in Matlab/Simulink, implementing MPPT for the PV system, and applying control strategies (single-loop and dual-loop with PR and QPR controllers). Harmonic distortions are introduced in grid voltages, and performance is evaluated through FFT analysis of currents at the point of common coupling (PCC).
5：Data Analysis Methods:
Data is analyzed using Bode plots for frequency response and FFT for harmonic spectra. THD (Total Harmonic Distortion) values are calculated to compare performance with and without harmonic compensation.
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
