An Adaptive Synchronous-Reference-Frame Phase-Locked Loop for Power Quality Improvement in a Polluted Utility Grid
作者： Fran Gonzalez-Espin , Emilio Figueres , Gabriel Garcera
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摘要: The proper operation of grid-connected power electronics converters needs using a synchronization technique to estimate the phase grid voltage. performance this is related quality consumed or delivered electric power. synchronous-reference-frame phase-locked loop (SRF-PLL) has been widely used due its ease and robust behavior. However, estimated can have considerable amount unwanted ripple if voltage disturbances are not properly rejected. aim paper propose an adaptive SRF-PLL which strongly rejects these even fundamental frequency varies. This accomplished by several infinite-impulse-response notch filters, implemented means inherently stable Schur-lattice structure. structure perfectly suited be programmed in fixed-point DSPs (i.e., it high mapping precision, low roundoff accumulation, suppression quantization limit cycle oscillations). proposed tested TI TMS320F2812 DSP. obtained experimental results show that method highly undesired harmonics harmonic polluted abruptly
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