1 Performance Analysis of Solar Photovoltaic Array Configurations to reduce Mismatch Losses under Partial Shaded Conditions Yu Mon Thandar Htet #1 , Aung Ze Ya #2 ,Hla Aye Thar #3 # Department of Electrical Power Engineering, Yangon Technological University, Yangon Technological University, Insein Towinship, Yangon, Myanmar # haneycho528@gmail.com # dr.aungzeya010@gmail.com # hlaaayethar@gmail.com Abstract - This paper analyses the effects of partial shading on energy output of different solar photovoltaic array configurations and to mitigate the mismatch loss faced in solar photovoltaic system. In this study, the photovoltaic power system is designed to electrify the building of the university that is situated in Insein Township, Yangon division, Myanmar. Geographically, it is located at latitude 16˚ 8' N and longitude 96°50'E. The power demand of the proposed building is estimated as 17.64kW. The considered photovoltaic power system consists of 60 modules. Each module is 300W multi-crystalline module. The photovoltaic array configurations are modelled in MATLAB/SIMULINK with four different configurations. These configurations are Series Parallel (SP), Total Cross Tied (TCT), Bridge Linked (BL) and Honey Comb (HC). After modelling, the different configurations are simulated and compared under various partial shaded conditions such as 200W/m 2 , 500W/m 2 , 800W/m 2 . Finally, it is observed that the best configuration is TCT that can reduce the mismatch losses under partial shading conditions. Keywords – Photovoltaic system, mismatch losses, partial shading, TCT, MATLAB/SIMULINK I. INTRODUCTION The fossil fuels depleting, increment of energy consumption and global interrelated energy problems face most of the country in the world. These problems lead to a new trend of production energy by using renewable sources and non-renewable sources. Renewable energy resources are abundant, clean, cost efficient, and do not emit harmful CO 2 gases. Among the renewable energy resources, solar energy is the most abundant energy resource on earth. The energy through the photovoltaic (PV) effect can be considered the most essential and prerequisite sustainable resources because of the ubiquity, abundance, and sustainability of solar radiant energy. The use of photovoltaic systems for electricity generation started growing rapidly in Myanmar. However, their performance depends on insolation, temperature, partial shading condition, place where solar photovoltaic system is installed. Among these factors partial shading is considered to be the most. Partial shading is the condition when some of the cells, modules, arrays receives less insolation due to falling leaves of trees, dirt, bird litters, rain, cloud, pole etc. At this condition, output of shaded cells fall down and mismatch losses occur. Under partial shaded conditions, photo current continues to operate unshaded cells to equal for all series connected solar photovoltaic cell. Therefore, the shaded cells conduct through large current [1, 2, 7, 8].The voltage at which the shaded cells operate in this condition is reverse voltage. So, it consume power during this period and thus extracted maximum power from whole solar photovoltaic array decreases. Hence high bias voltage causes hot spot problem and mismatch losses in solar photovoltaic system. This paper proposed four different configurations such as SP, TCT, BL and HC to reduce the mismatch losses. Result from a measurement campaign on a 17.64kW plant carried out on university’s building using various interconnection schemes are presented. II.ARRAY CONFIGURATIONS Several topologies of solar photovoltaic are investigated viz. Series-parallel (SP) fig. 1(a), Bridge-linked (BL) fig.1 (b), and Honey-comb (HC) fig.1(c) Total-cross-tied (TCT) fig.1(d). It is important to study the behavior of these configurations for different shading patterns. In SP configuration, modules are first connected in series to generate required current and then in parallel fashion to meet required voltage [12]. TCT configuration is derived form of SP configuration in which modules are first connected in parallel and then these parallel connections are connected in series fashion to generate required power [6]. BL is modified configuration of TCT and thus some of the ties from TCT is removed [9]. The modification in BL configuration is made to form a new configuration called HC configuration. It is designed by the