ﺑﻬﺒﻮد ﻋﻤﻠﮑﺮد روش اﻣﭙﺪاﻧﺲ ﻣﺠﺎزي ﺗﻄﺒﯿﻘﯽ در رﯾﺰﺷﺒﮑﻪ ﺟﺰ ﯾﺮه اي

Improving the Performance of the Adaptive Virtual Impedance Method in the Island Microgrid

ﯾﮑﯽ از ﻣﻌﻀﻼت اﺻﻠﯽ در ر ﯾ ﺰﺷﺒﮑﻪ ﻫﺎ ي ﺟﺰﯾﺮها ي، ﺗﻘﺴﯿﻢ ﺗﻮان راﮐﺘﯿﻮ ﺑﯿﻦ ﻣﻨﺎﺑﻊ ﺗﻮﻟﯿﺪ ﭘﺮاﮐﻨﺪه ﻣ ﯽﺑﺎﺷﺪ . اﺳﺘﻔﺎده از اﻣﭙﺪاﻧﺲ ﻣﺠﺎزي ﺗﻄﺒﯿﻘﯽ ﺑﻪ ﻋﻨﻮان ﯾﮑﯽ از راﻫﮑﺎرﻫﺎي ﺑﻬﺒﻮد ﺗﻘﺴﯿﻢ ﺗﻮان راﮐﺘﯿﻮ ﺑﯿﻦ ﻣﻨﺎﺑﻊ ﺗﻮﻟﯿﺪ ﭘﺮاﮐﻨﺪه ﻣﻌﺮﻓﯽ ﺷﺪه اﺳﺖ. اﮔﺮﭼﻪ اﺳﺘﻔﺎده از اﻣﭙﺪاﻧﺲ ﻣﺠﺎزي ﺗﻄﺒﯿﻘﯽ ﺳﺒ ﺐ ﺑﻬﺒﻮد ﺗﻘﺴﯿﻢ ﺗﻮان راﮐﺘﯿﻮ ﺑﯿﻦ ﻣﻨﺎﺑﻊ ﺗﻮﻟﯿﺪ ﭘﺮاﮐﻨﺪه و ﮐﺎﻫﺶ ﺟﺮﯾﺎن ﮔﺮدﺷﯽ ﻣ ﯽ ﺷﻮد اﻣﺎ ﺳﺒﺐ اﯾﺠﺎد اﻓﺖ وﻟﺘﺎژ ﺷﺪه و داﻣﻨﻪ وﻟﺘﺎژ ﺧﺮوﺟﯽ واﺣﺪ ﺗﻮ ﻟﯿ ﺪي ﭘﺮاﮐﻨﺪه ﮐﺎﻫﺶ ﻣ ﯽ ﯾﺎﺑﺪ . در اﯾﻦ ﻣﻘﺎﻟﻪ، ﯾﮏ اﺳﺘﺮاﺗﮋي ﮐﻨﺘﺮﻟﯽ ﺑﺮاي ﺑﻬﺒﻮد روش اﻣﭙﺪاﻧﺲ ﻣﺠﺎزي ﺗﻄﺒﯿﻘﯽ ﭘﯿﺸﻨﻬﺎد ﮔﺮدﯾﺪه اﺳﺖ. در اﺳﺘﺮا ﺗﮋي ﮐﻨﺘﺮﻟﯽ ﭘﯿﺸﻨﻬﺎدي، اﻓﺖ وﻟﺘﺎژ روي اﻣﭙﺪاﻧﺲ ﺧﺮوﺟﯽ واﺣﺪﻫﺎي ﺗﻮﻟﯿﺪ ﭘﺮاﮐﻨﺪه ﮐﻪ ﺑﻪ د ﻟﯿﻞ اﺳﺘﻔﺎده از اﻣﭙﺪاﻧﺲ ﻣﺠﺎزي اﻓﺰاﯾ ﺶ ﯾ ﺎﻓﺘﻪ ، ﺟﺒﺮان ﻣﯽ ﺷﻮد و وﻟﺘﺎژ ﺗﻐﺬﯾﻪ ﺑﺎر در ﻣﻘﺪار ﻧﺎﻣﯽ ﺗﻨﻈﯿﻢ ﻣ ﯽ ﮔﺮدد . روش ﮐﻨﺘﺮﻟﯽ ﭘﯿﺸﻨﻬﺎدي، ﻋﻼوه ﺑﺮ ﺣﻔﻆ ﻣﺰاﯾﺎي اﺳﺘﻔﺎده از اﻣﭙﺪاﻧﺲ ﻣﺠﺎزي ﺗﻄﺒﯿﻘﯽ ﻧﻈﯿﺮ ﺗﻘﺴﯿﻢ ﻣﻨﺎﺳﺐ ﺗﻮان ﻫﺎ ي اﮐﺘﯿﻮ و راﮐﺘﯿﻮ ﺑﯿﻦ واﺣﺪﻫﺎي ﺗﻮﻟﯿﺪ ﭘﺮاﮐﻨﺪه و ﮐﺎﻫﺶ ﺟﺮﯾﺎن ﮔﺮدﺷﯽ، اﻓﺖ وﻟﺘﺎژ اﯾﺠﺎد ﺷﺪه در اﻣﭙﺪاﻧﺲ ﺧﺮوﺟﯽ ﺟﺒﺮان ﻣ ﯽ ﺷﻮد . در روش ﭘﯿﺸﻨﻬﺎدي وﻟﺘﺎژ ﻣﺮﺟﻊ ﺗﻮﻟﯿﺪي روش ﮐﻨﺘﺮل اﻓﺘﯽ ﻣﺘﻨﺎﺳﺐ ﺑﺎ ﺗﻐﯿﯿﺮ ﺑﺎر، در ﻣﺤﺪوده ﻣﺠﺎز ﺗﻨﻈﯿﻢ ﻣﯽ ﺷﻮد . ﺑﺮاي ارزﯾﺎﺑﯽ ﻋﻤﻠﮑﺮد و ﮐﺎر اﯾﯽ، روش ﮐﻨﺘﺮﻟﯽ ﭘﯿﺸﻨﻬﺎدي، روي ﯾﮏ رﯾﺰﺷﺒﮑﻪ ﺟﺰ ﯾ ﺮهاي ﺷﺎﻣﻞ دو واﺣﺪ ﺗﻮﻟﯿﺪ ﭘﺮاﮐﻨﺪه اﺟﺮا ﺷﺪ. ﻧﺘﺎﯾﺞ ﺷﺒ ﯿ ﻪ ﺳﺎزي ﻧﺸﺎن دﻫﻨﺪه ﻋﻤﻠﮑﺮد و ﮐﺎر اﯾﯽ ﻣﻨﺎﺳﺐ روش ﭘﯿﺸﻨﻬﺎدي ﻣ ﯽ ﺑﺎﺷﺪ .

One of the main challenges in island microgrids is the distribution of reactive power between distributed generation sources. The use of adaptive virtual impedance has been introduced as a method of improving the distribution of reactive power between distributed generation sources. Although the use of adaptive virtual impedance improves the reactive power distribution between the distributed generation sources and reduces the circulating current, it causes a voltage drop and the output voltage range of the distributed generation unit is reduced. In this paper, a control strategy for improving the adaptive virtual impedance method is proposed. In the proposed control strategy, the voltage drop across the output impedance of the distributed generation units is compensated due to the use of increased virtual impedance, and the load supply voltage is adjusted to the nominal value. The proposed control method, in addition to maintaining the advantages of using adaptive virtual impedance such as appropriate distribution of active and reactive capacities between distributed generation units and reducing circulating current, compensates for the voltage drop in the output impedance. In the proposed method, the output reference voltage of the drop control method is adjusted within the allowable range in proportion to the load change. To evaluate performance and efficiency, the proposed control method is implemented on an island microgrid consisting of two distributed generation units. The simulation results show the performance and efficiency of the proposed method.