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The phase-locked loop (PLL) algorithms are of crucial significance for the stable operation and effective grid-integration of power converters and renewable energy systems. In this paper, a comprehensive analysis and performance comparison is presented on the detection performance for three PLLs (NTD-PLL, DCOC-PLL and TPFA-PLL) under grid voltage disturbances, such as phase jump, frequency step change,...
Proportional-resonant (PR) compensator and LCL filter becomes a better choice in grid-connected inverter system with high performance and low costs. However, the resonance phenomenon caused by LCL filter affect the system stability significantly. In this paper, the stability problem of three typical current feedback control schemes in LCL grid-connected system are analyzed and compared systematically...
Based on a practical engineering, the effects of soil-structure interactions on the dynamic characteristics of the high-piled wharf were investigated, and the influences of different soil-structure constraint styles and initial earth stress on the calculation of dynamic parameters were also studied. The results of the study were the following: (a) the soil-structure interactions should be considered...
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