研究目的
To suppress the second harmonic of output power for photovoltaic grid-connected inverters under unbalanced voltage drop conditions by adjusting the harmonic suppression target according to the degree of voltage drop.
研究成果
The proposed control strategy can effectively suppress the second harmonic of inverter output power under different voltage drop degrees, improving power quality and supply stability. However, further modifications are needed to improve the inverter's output power quality during low voltage ride-through period.
研究不足
When the voltage drop becomes large enough, the strategy can only control four power components, leading to incomplete suppression of active power second harmonics.
1：Experimental Design and Method Selection:
A new low voltage ride-through control strategy is proposed, utilizing two feed forward decoupling loops to control positive and negative sequence currents independently.
2：Sample Selection and Data Sources:
Simulation of a single-phase unbalanced voltage drop fault in MATLAB.
3：List of Experimental Equipment and Materials:
Three-Phase Source model for the alternator, Three-Phase Parallel RLC Load for the load, and Three-Phase Fault generator for simulating single-phase voltage drop faults.
4：Experimental Procedures and Operational Workflow:
The strategy is simulated under different voltage drop degrees (94% and 70%) to verify its effectiveness in suppressing second harmonics.
5：Data Analysis Methods:
The harmonic distortion rate is calculated to evaluate the suppression effectiveness.
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