70 PERFORMANCE ANALYSIS OF FUZZY LOGIC CONTROLLED HYBRID ACTIVE DC FILTER (HADF) FOR 12-PULSE HVDC CONVERTER KIRAN YADDANAPUDI 1* , PANNALA KRISHNA MURTHY 2 1* Research Scholar, Department of Electrical & Electronics Engineering, Jawaharlal Nehru Technological University Hyderabad, Hyderabad, Email: kiran045@gmail.com 2 Professor, Department of Electrical & Electronics Engineering, Khammam Institute of Technology and Sciences, Khammam, Email:krishnamurthy.pannala@gmail.com ABSTRACT Transmission of power through High Voltage Alternating Current (HVAC) Transmission lines results in power losses in the transmission line, higher the length of transmission line higher the losses, furthermore cost of transmission line also increases with length. In order to maintain the voltage within the limits, reactive power also need to be transmitted over the same line which again increases the power losses. In order to overcome the above problems, High Voltage Direct Current (HVDC) is preferred to transmit the power when the distance of transmission is above 500kM, which requires only one conductor for Monopolar Link and ground acts as return conductor. The converters used for conversion of power from ac to dc produce harmonics, which can be handled with the filters. In the proposed work a 12-pulse HVDC converter with Hybrid Active DC Filter (HADF) consisting of 100 MVAR Shunt Passive Filter and Shunt Active DC Power Filter controlled by fuzzy logic is designed and simulated in MATLAB/Simulink, Shunt Active DC Power Filter handled the higher order harmonics and compensated the remaining reactive power in addition to passive filters. KEY WORDS: High Voltage DC Transmission, Passive Filters, Shunt Active DC Power Filter, Hybrid Active DC Filter, Fuzzy Logic Controller. 1. INTRODUCTION Electrical Power when transmitted through High Voltage Alternating Current (HVAC) Transmission lines to the load, some amount of power is wasted in terms of losses which occur in the transmission line due to its parameters like resistance, inductance & capacitance also skin effect, corona loss will also add to these losses. Furthermore to maintain the voltage within the specified limits, reactive power needs to be transmitted through these lines which also add to these power losses. To overcome above drawbacks the alternative solution is High Voltage Direct Current transmission. Transmission of Electrical Power through HVDC is economical when the length of transmission is above 500kM. HVDC has many advantages over HVAC such as low power losses, thinner conductor, small transmission towers, asynchronous interconnection of two grids with different electrical parameters, underground and under water power transmission etc.,[1] On the other side HVDC transmission also possess a drawback such as generation of harmonics by converters, which can be reduced by additional filters installed at converter stations both at sending and receiving end. These filters can be either passive filters, active filters or both. 2. TWELVE PULSE RECTIFIER In the proposed work a Twelve Pulse HVDC Rectifier with Hybrid Active DC Filter (HADF) consisting of ISSN 2347 - 3983 Volume 9. No. 2, February 2021 International Journal of Emerging Trends in Engineering Research Available Online at http://www.warse.org/IJETER/static/pdf/file/ijeter10922021.pdf https://doi.org/10.30534/ijeter/2021/10922021