T^p chi Khoa hgc va Cong nghe 103 (2014) 001-006 Modeling and Control of Supercapacitor Energy Storage Systems M6 hinh hoa va dieu khien thiet bi kho dien sii dung sieu tu Pham Tuan Anh'-^, Vu Hoang Phuong', Nguyen Phung Quang'* 'Hanoi University of Science and Technology - No I, Dai Co Viet Sir., Hai Ba Ti-ung, Ha Noi, Viet Nam ^Vietnam Maritime University - No 484, Lach Tray, Ngo Quyen, Hai Phong Received: April 07, 2014; accepted October 28, 2014 Abstract Wind power is one of the renewables energy resources that help to lower the global warming trend Unlike a traditional centralized generation plant, these new sources may be located anywhere on the grid Because of wind fluctuation, the connection of a wind turbine to a grid (especially in islands where the grids are weak) could create severe problems to the transmission line designed for constant power and to the power system stability A possible solution to the problem is the use of suitable energy storage This approach employs a power conversion system which has the ability to provide the positive response of fast-dynamic energy storage for high power requirement in order to smooth out the output to eliminate rapid power oscillations on the grid This paper focuses on a Supercapacitor Energy Storage System (SCESS) in terms of modeling and control designing aim to manage active power flow between the grid and the SCESS The effectiveness of the proposed control scheme is validated by simulations Keywords: Supercapacitor Energy Storage System (SCESS), Bidirectional DC-DC Converter, Voltage Source Inverter, Active Rectifier Tom tat NSng luvmg gl6 la mot nhirng nguon nang Iwang tai tao dwcfc nghien cdu - tnen khai gop phin kim ham sLf ndng len toan ciu NhOng ngudn phcit dien co thi tich hop rii rac vSo bit cO" vi tn nao cua liKfi di§n Di§n nang san sinh tO" cac tua-bin phat dien sue gio v6n c6 dac diim biin dong thit thirong Vi v$y, vi$c ghep tua-bIn vdi mot iwdi dien se gay nen nhu-ng anh hirdng xiu din tinh On dinh cOa luvyi di§n dac biet la nhOng iuv'i diSn & khu vwc hai dao mang tinh chat Iw&i yiu I^ot giai phap di giai quyet vin di tren H stJ" dung thiet bi tich triy nang lu^ng phu hop co l dyng sieu tu dam bao kha nang trao ddi cong suit hai chiiu vdi luvi Nhung kit qua nghi§n cdu tfutrc kiim chdng thong qua md phong Tir khoa Thiet bj Itho dien SCP dyng sieu tu, bg bi§n a6i DC-DC hai chieu, nghich iu'u ngufin ap, chinh lu'u tich cyc Introduction generators The main issues of using the ESS to smooth out output power include ESS topology and The principles of a wind turbine are shown in capacity requirement, converter control, ESS power Fig A wind energy conversion system transforms reference setting, etc Different types of ESS have wind kmetic energy mto mechanical energy via rotor been considered, such as batteries, supercapacitors blades This energy is then converted into electrical « u i ' J ' ^ ' ,.„''-' , flywheels, superconductmg magnetic energy storage, energy by different types of generators suoh as ^,^ ^^^ ^^^ ^_._._^ ^^^^.^ ^^ Supercapacitors doubly-ted induction generators and permanent ^ c^, ^ • u i- u i: •' , , "= ^ „ represent one or the newest innovations m the tield or magnet-excted synchronous generators Power ^j^^^^^, ^ ^ , ^ ^ _^ ^ ,^^ converters are responsible tor transformation or , ^ - j L „ -T-I c,-^ u i , ^ ^ , between capacitor and battery The SC has large electrical energy, makmg it suitable for the electric t r - u J-L One area ^•'J, • the 1, high u- h fluctuation fl • off capacitance, excellent instantaneous charge-discharge grid of concerns is performance, higher power density (but lower energy power output from wmd turbines due to the wild density) and longer life cycle than battery [3] The varying wind speed The frequency fluctuation and SCESS might be integrated to DC-bus some power quality problems threaten the security ,, j , ^ A/^J HJ*,- IJ , , rJ • :, called DC-coupled or AC-side so called AC-coupled and stability oi power system caused by wmd cannot _ cz-r-nc i u L J , _, T, ,, • _, , so that the SCESS can exchange both active and be ignored Ihe problem mentioned above can be ^ •.! .u - J • , , , '^ , , ,, reactive power with the wmd power system aim to solved by equipping the wind power system with an ^^„„,^ „^t t^^ „ , „ a power fluotuations and energy storage system (ESS) to absorb or supply ^,^y,j^; ,^^ ^ ,^, ^^^ power to compensate the fluctuated output from the -, r u^ t^ f f The purpose of this paper is to suggest a new effective and simple confrol scheme ofthe SCESS in • Corresponding author: Tel (+84)4 3868.3518 order to achive rapid response of both active and Email: Quang nguyenphung@hust.edu.vn reactive power exchange Tap chi Khoa h^c va Cong n g h | 103 (2014) 001-006 Q Conlrol) _ _ _ _ _ _ _;_^ _