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Paul, Vini Sara
- Power Flow Analysis of Hybrid AC-DC Microgrid
Authors
Source
Programmable Device Circuits and Systems, Vol 8, No 8 (2016), Pagination: 219-222Abstract
Hybrid microgrid is composed of individual AC and DC grid. And it is connected together by an interlinking converter. Here photovoltaic array is used as DC source and wind turbine as AC source. Main objective is to develop a co-ordinate control system for hybrid microgrid and to share the power which is in proportion to the power ratings. Droop control technique is used to manage the power flow through interlinking converter in the hybrid AC-DC microgrid. The operation of hybrid AC-DC microgrid and the power flow is investigated using MATLAB simulation. Four cases of power flow have been tested i) equal AC and DC load ii) high AC and low DC load iii) low AC and high DC load.
Keywords
Distributed Generation (DG), Photo Voltaic (PV).
- Reactive Power Compensation of a Single Phase Grid Connected Photovoltaic System Using Modified PQ Theory and Single Phase Seven Level Inverter
Authors
1 Thejus Engineering College, Thrissur, Kerala, IN
Source
Programmable Device Circuits and Systems, Vol 8, No 11 (2016), Pagination: 316-321Abstract
This work aims at designing and modeling of a single phase grid connected photovoltaic system with a control strategy that utilizes instantaneous power theory also known as p-q theory. The inverter topology used is the novel single phase seven level inverter. With the use of the multilevel inverter the THD of the load current is reduced to a small value. For the switching pattern of the inverter, hysteresis band current control technique is applied. The MPPT algorithm which is used in this work is the Perturb and Observation algorithm (p&o) algorithm. P&O algorithm is the simplest mppt method. The time complexity of this algorithm is very less but on reaching very close to the MPP it doesn’t stop at the MPP and keeps on perturbing on both the directions. The cost of implementation is less and hence easy to implement.
According to this strategy during sunlight the system sends active power to the grid and at the same time compensates the reactive power of the load. The advantage of this control strategy is that the photovoltaic system is operated the whole day. Furthermore, the p–q theory uses simple algebraic calculations without demanding the use of PLL to synchronize the inverter with the grid. The simulation for the proposed system is carried out using MATLAB simulink software.