ﯾﮏ ﺣﻠﻘﻪ ﻗﻔﻞ ﻓﺎز ﺳﺮﯾﻊ و ﺧﻮدﺗﻄﺒﯿﻖ ﺑﺮاي ﺳﯿﺴﺘﻢ ﻫﺎي ﻓﺘﻮوﻟﺘﺎﺋﯿﮏ ﺗﮏ ﻓﺎز ﻣﺘﺼﻞ ﺑﻪ ﺷﺒﮑﻪ

A Fast and Adaptive PLL For Single Phase Grid-Connected PV Systems

ﭼﮑﯿﺪه: ﻓﺎز، ﻓﺮﮐﺎﻧﺲ و داﻣﻨﻪ وﻟﺘﺎژ ﺷﺒﮑﻪ اﻃﻼﻋﺎت ﻣﻬﻤﯽ در ﺳﯿﺴﺘﻢ ﻫﺎي ﻓﺘﻮوﻟﺘﺎﺋﯿﮏ ﻣﺘﺼﻞ ﺑﻪ ﺷﺒﮑﻪ ﻫﺴﺘﻨﺪ. ﺑﺮاي ﻋﻤﻠﯿﺎت ﻣﻨﺎﺳﺐ و ﭘﺎﯾﺪار ﯾﮏ ﺳﯿﺴﺘﻢ، ﺗﺨﻤﯿﻦ ﺻﺤﯿﺢ و ﺳﺮﯾﻊ اﻃﻼﻋﺎت ﺷﺒﮑﻪ ﺗﺤﺖ ﺗﻐﯿﯿﺮات و اﺧﺘﻼﻻت ﺷﺒﮑﻪ از اﻫﻤﯿﺖ وﯾﮋه اي ﺑﺮﺧﻮردار اﺳﺖ. در اﯾﻦ ﻣﻘﺎﻟﻪ ﯾﮏ ﺳﺎﺧﺘﺎر ﺣﻠﻘﻪ ﻗﻔﻞ ﻓﺎز ﺧﻮد ﺗﻄﺒﯿﻖ ﺟﻬﺖ ردﯾﺎﺑﯽ ﺳﺮﯾﻊ و ﺻﺎف ﭘﺮش ﻫﺎي ﻓﺎزي وﻟﺘﺎژ ﺷﺒﮑﻪ اراﺋﻪ ﺷﺪه اﺳﺖ. ﺑﻪ ﻃﻮري ﮐﻪ اﮔﺮ ﭘﺮﺷﯽ در ﻓﺎز وﻟﺘﺎژ ﺷﺒﮑﻪ اﯾﺠﺎد ﺷﻮد، زﻣﺎن ﺣﺎﻟﺖ ﮔﺬرا در ﻓﺮﮐﺎﻧﺲ ﺗﺨﻤﯿﻦ زده ﺷﺪه ﺗﻮﺳﻂ ﺣﻠﻘﻪ ﻗﻔﻞ ﻓﺮﮐﺎﻧﺲ ﺗﻘﺮﯾﺒﺎ ﺑﺮاﺑﺮ ﺻﻔﺮ ﺧﻮاﻫﺪ ﺑﻮد. ﺣﻠﻘﻪ ﻗﻔﻞ ﻓﺎز اراﺋﻪ ﺷﺪه ﻫﻤﭽﻨﯿﻦ داراي زﻣﺎن ﻧﺸﺴﺖ ﺑﺴﯿﺎر ﮐﻢ ﺑﺮاي ﻓﺮﮐﺎﻧﺲ، ﻓﺎز و داﻣﻨﻪ ﺗﺨﻤﯿﻦ زده ﺷﺪه اﺳﺖ. در ﻃﺮاﺣﯽ اﯾﻦ ﺣﻠﻘﻪ ﻗﻔﻞ ﻓﺎز از اﻧﺘﮕﺮال ﮔﯿﺮ ﺗﻌﻤﯿﻢ ﯾﺎﻓﺘﻪ ﻣﺮﺗﺒﻪ دوم ﺑﻪ ﻫﻤﺮاه ﺣﻠﻘﻪ ﻗﻔﻞ ﻓﺮﮐﺎﻧﺲ ﺑﻬﺮه ﮔﺮﻓﺘﻪ ﺷﺪه اﺳﺖ. ﺗﻤﺎﻣﯽ ﺷﺒﯿﻪ ﺳﺎزي ﻫﺎ در ﻣﺤﯿﻂ ﺳﯿﻤﻮﻟﯿﻨﮏ ﻣﺘﻠﺐ اﻧﺠﺎم ﮔﺮﻓﺘﻪ اﺳﺖ. زﻣﺎن ﻧﺸﺴﺖ ﻓﺮﮐﺎﻧﺲ و داﻣﻨﻪ PLL ﭘﯿﺶ ﻧﻬﺎدي ﺑﻪ ﺗﺮﺗﯿﺐ ﺑﺮاﺑﺮ ﺑﺎ 0,023 و 0,024 ﺛﺎﻧﯿﻪ ﻫﺴﺘﻨﺪ.

Phase, frequency, and amplitude of grid voltage are important information in grid-connected photovoltaic systems. For proper and stable operation of a system, a fast and correct estimation of grid information under grid variations and disturbances is very crucial. In this paper, an adaptive phase-locked loop (PLL) structure is proposed which tracks the phase jumps of grid voltage fast and smoothly. If a jump occurs in grid voltage phase transient state at the frequency estimation of frequency lock loop (FLL) will be almost zero. The settling times of the estimated phase, frequency, and amplitude of the proposed PLL are also slightly low. The proposed PLL consists of the second-order generalized integrator (SOGI) and frequency locked loop (FLL). The whole system has been simulated in MATLAB/Simulink. The settling time of estimated frequency and amplitude for proposed PLL are 0.023 and 0.024 s, respectively.