研究目的
To investigate maximum PV penetration level and its effects on the acceptable harmonic standards, and to propose a simple and low-cost measure to mitigate the harmonic problem.
研究成果
The study distinguishes between THD and TDD regarding current distortion, evaluates the maximum allowable PV capacity at each bus based on TDDi, and proposes an adaptive solution to mitigate harmonics by varying filter parameters with irradiance levels. The solution is cost-effective and successfully reduces harmonic distortion at low irradiance.
研究不足
The study is based on theoretical analysis and software simulation, with practical experiments to be implemented in the next stage. The adaptive solution's effectiveness may vary with more classification groups for irradiance levels, potentially increasing switch operations and reducing equipment lifecycles.
1：Experimental Design and Method Selection:
A typical three-bus distribution network model is built in MATLAB/Simulink to simulate the harmonic problem caused by PV penetration, incorporating scenarios like irradiance variations.
2：Sample Selection and Data Sources:
The study uses a 250kW PV system connected to a distribution network, with parameters modified from an original network.
3：List of Experimental Equipment and Materials:
Includes PV panels (SunPower SPR-415E-WHT-D), a three-level based IGBT bridge circuit for DC/AC conversion, and passive filter elements (series RL choke circuit and a C-filter in parallel).
4：Experimental Procedures and Operational Workflow:
The study involves simulating harmonic scenarios against irradiance variations, evaluating THDv and THDi at each bus, and testing adaptive filter settings to mitigate harmonics.
5：Data Analysis Methods:
The analysis includes evaluating TDDi and THDi under different irradiance levels and PV penetration levels, using IEEE std 519-2014 for harmonic constraints.
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