... chu kỳ sau: ccc → acc → aca → aaa → aba → abb → bbb Tương ứng với khóa chuyển mạch sau: Hình 7: Các khối mô matlab Hình 6: Sơ đồ chuyển mạch khóa chu kỳ Ts Ghi :Ký hiệu SAc nghĩa pha A tải ... − d − d Sau xác định b n vec tơ trạng thái giả sử trường hợp -3 -4 tương ứng với áp dòng vào nằm sector 1, theo b ng trạng thái chuyển mạch lúc : acc → abb → aca → aba acc nghĩa pha A tải nối ... Matrix Converters” IEEE Transactions On Industrial Electronics, Vol.51, No.1, February 2004 [7] Lars Helle, Kim B. Larsen, Allan Holm Jorgensen, Stig MunkNielsen, Member, IEEE, and Frede Blaabjerg,Fellow,...
... vo b) MatrixConverter v bintn giỏn tip - Mt s u im ca bintn giỏn tip cng c ng dng cụng ngh MatrixConverter + Vỡ MatrixConverter c phõn tớch nh mt bbin i gm tng bin i, tng chnh lu v tng ... qua b lc ri mi bin tr v in ỏp xoay chiu vi tn s f Vic bin i nng lng ln lm gim hiu sut bin tn, b li loi bintn ny cho phộp d dng thay i tn s f khụng ph thuc f1 di tn rng c trờn ln di f1 vỡ tn ... ngun ỏp (back to back) cú chnh lu iu khin l bbin tn, cú cựng chỳc nng dn dũng cụng sut chy theo hng v to dũng vo hỡnh sin Cú th thy t ni mt chiu v in cm u vo s dng bbintn (back to back) l c...
... Hạt nêm, tiêu Các b ớc thực hiện: Gà làm lông, moi b ruột, rửa sạch, để Xát hạt nêm khắp gà, để khoảng 10 phút Hạt sen rửa sạch, ... cho mềm Củ sen gọt vỏ, xắt miếng mỏng, ngâm nước có pha giấm Đun nóng dầu, cho gà vào chao qua, b y vào liễn Xếp củ sen, kỷ tử, hạt sen, long nhãn vào, đổ ngập nước, cho vào nồi hấp cách thủy...
... the accurate input currents tracking are obtained Finally the control has been tested for a reference voltage step change with A load current as reported in Fig 12: Fig 13 shows both input currents ... is obtained for the AC side: The PWM technique has been introduced in rectifiers control in order to obtain almost sinusoidal input currents and unity power factor in each physically possible ... the black box that controls the energy flow (Fig 2) In effect, the voltage control loop will be designed under energy considerations [ ] but a fuzzy controller will be used to take into account...
... x (a; b) g supffĂ (x) : x (a; b) g: 2.1.26 Chứng minh f C([a; b] ) fĂ tồn (a; b) infffĂ (x) : x (a; b) g f (b) Ă f (a) supffĂ (x) : x (a; b) g: b a 2.1.27 Chứng minh fĂ tồn liên tục (a; b) f khả ... 11 (a) Cho f; g C([a; b] ) với x [a; b] , đặt h(x) = minff (x); g(x)g H(x) = maxff (x); g(x)g Chứng minh h; H C([a; b] ) (b) Cho f1 ; f2 ; f3 C([a; b] ) với x [a; b] , đặt f (x) ba giá trị f1 (x); f2 ... 1.5.5 (a) Chứng minh f liên tục (a; b] [b; c) , liên tục (a; c) 25 (b) Giả sử A B tập đóng R gọi f : A [ B ! R liên tục A B Hỏi f có thiết liên tục A [ B ? 1.5.6 Chứng minh hàm liên tục tuần...
... thuật” cho phòng, b y lên họa phẩm Dean Dass, Richard Berger Jacqueline Jacovini b nh kiểu cổ năm 1920, niên đại với nhà Lời khuyên: Hãy tôn trọng giá trị cũ nhà, thực đặc biệt Nếu chi tiết cũ, ... Hudson Để đơn giản hóa không gian, hai KTS Jane Siris Peter Coombs nhập cửa lại làm một, tạo ô cửa lớn, dễ b y biện đồ đạc Một b nh hoa đặt trước khung cửa mở rộng, tăng vẻ đẹp không gian Lời ... gác chân b y hững hờ để đọc sách ngắm nhìn phong cảnh Phòng ngủ master trở nên sáng sủa lịch, gần gũi với thiên nhiên Lời khuyên: Khi b n có view đẹp, tận dụng hết, biến thành trung tâm b n cạnh...
... List of Abbreviations AC Alternating Current ADC Analog to Digital Converter AICS Active Input Current Shaper ASIC Application-Specific Integrated Circuit BIFRED Boost Integrated with Flyback Rectifier/Energy ... magnetizing force BDC: DC flux density B : AC flux density Figure 2.4: B- H hysteresis loop Substituting (2.7) into (2.6), we have B( t) = BDC (t) + B( t) = NIL (t) N∆iL (t) + Ac R Ac R (2.8) H(t) ... ear to my problems I would also like to thank Mr Abdul Jalil Bin Din for his advice on PCB design and his help on PCB fabrication I gratefully acknowledge Infineon Technologies Asia Pacific Pte Ltd...
... thông số sau ( H2 ) B i toán đặt cho biết khoảng cách hai b nh xe l = 400 (mm), góc nghiêng = 450 tìm b n kính cung tròn R, độ dài BC 4002 =R2 + R2 => R = 400 2 = 282,8 (mm) BC = AC. cos45o = 100.cos45o ... làm việc cấu ta có mô hình tính nh sau ( H4 ) B 30 A 50 R1 O C A B 614.0 1,000.0 B1 O B1 B C 1,828.0 Hình _ Từ sơ đồ chung ta có sơ đồ tính BB1 biểu đồ nội lực ( hìnhvẽ ) Trong giá trị lực F ... 15 R A R180 B 45 23 R C D R1 76 hinh 2.3 Cách dựng : Khi càngkẹp xoay quanh khớp A , đầukhớp trợt C chuyển động cung tròn BC b n kính AB , vị trí AbB kẹp mở không kẹp thùng vị trí AC kẹp đóng...
... enclosed by the dashed box in Fig It consists of nine bidirectional or ac switches, where each of them possesses the capability of bidirectional energy flow Each output phase of a × matrixconverter ... controller The current-control loop is controlled in the abc frame The matrixconverter is treated as a two-stage ac/ dc /ac converter or rectifier/inverter In the inverter stage, basic hysteresis current ... load neutral point must be accessible; in general, these points may not be available Finally, the need for additional triacs raises physical packaging issue and may not be a cost-effective solution...
... Rectifier mode matrix, , can be set up from switching functions S1 to S6 established by space vector method Number of elements in depends on the number of input phases (8) (9) (10) (11) It can be stated ... onephase matrixconverter From (1) and (2), the matrixconverter output voltage is given by where is amplitude of output current and is output angular frequency The input current can be expressed ... input current 0.133 per-unit A Input Filter Design High frequency current components in the input current of filter The value of matrixconverter can be filtered via a filter capacitor is selected by...
... rectifier using AC- ACmatrixconverter theory", IEEE Trans on Power Electronics, vol 7, No 1, 1992 , pp 240-250 [3] S Kim, S-K Sul and T.A Lipo "AC/ AC power conversion based on matrixconverter topology ... problems associated with conventional matrix converters • The converter offers the possibility of better efficiency than the conventional matrixconverter since switching of the input side converter ... (14) TABLE I DUTY CYCLE AND SWITCHING PATTERN OF THE RECTIFIER θa Duty Cycle Values d1 d2 π π ~ d1 d2 d ba d ca d bc − S ap Conducting Switches π π ~ 6 S bn π 5π ~ d1 d ac d2 d cb d ab S bp Moreover,...
... and 3b below show the surge voltage created by a conventional 2-level drive (Figure 3a) and the AC7 MatrixConverter (Figure 3b) The distance between the motor and drive is 328 ft (100 m) The AC7 ... specifications for the AC7 MatrixConverter are given in Table with product photos shown in Figure Table 1: AC7 MatrixConverter Product Specifications Item Specifications Applicable Motor Output (HP) ... MatrixConverter suppresses surge voltage by 20 to 50% 2.2 Input current control The AC7 MatrixConverter can use all three input phases in PWM switching to control output voltage and input current...
... A A BB −vCA −vBC vAB −vCA vBC −vAB −vCA vBC −vAB vCA −vBC vAB 0 0 0 ib −ib −ib ib ib ib −ib −ib −ib −ib ib ib 0 1 0 0 0 1 1 0 0 0 0 1 0 0 0 1 0 1 0 0 0 1 1 0 0 C C A A BB C C A A BB A BB C ... II -B II-C III 505 ACAC Converters Three-phase/three-phase matrixconverter switching combinations a b c vab vbc vca iA iB iC SAa SAb SAc SBa SBb SBc SCa SCb SCc A A BB C C B C A C A B C B C ... C A B A vAB −vCA −vAB vBC vCA −vBC vBC −vBC −vCA vCA vAB −vAB vCA −vAB −vBC vAB vBC −vCA ia ia ib ic ib ic ib ic ia ia ic ib ic ib ic ib ia ia 1 0 0 0 1 0 0 0 1 0 1 0 0 1 0 0 0 1 1 1 0 A BB C...
... CAa CAc CBb CCb CBc CAa CAc CBb CCa CCc V3 CAb Fig 8: Ordering pattern of input and output space vectors with switch cell capacitors that can be used in each subinterval C_a CAa CCa V5 CAb CCb CCc ... reference space vectors lie as shown Single capacitor control INPUT SIDE 00 Vab = 0V VAB = 0V Vca = 0V Phase b Phase B VBC = 0V Vbc = 0V 01 41 + - A B C -Vcap+ Branch Aa Phase A a b c vAB VBC = 0V ... Phase a Vab = Vcap VAB = -Vcap VCA = Vcap Phase B Phase b VBC = 0V Vbc = 0V Vca = -Vcap -Vcap+ Phase A Phase a Vab = Vcap VAB = -Vcap VCA = Vcap Phase B Vca = 0V Phase b VBC = 0V Vbc = -Vcap...
... 2/3 vab 2/3 vab 5π - iB iB (a-1) 2/3 iB iB 5π 22 b c b vb vc vb -a 2/3 vbc 2/3 vbc 5π - iB iB (a²-a) 2/3 iB iB 9π 23 iB π 24 c a c vc va vc -a 2/3 vca 2/3 vca a a a va va va bbb vb vb vb c c ... vb va vb a 2/3 vab 2/3 vab 2π iB - iB (1-a) 2/3 iB iB 11 π 13 c b c vc vb vc a 2/3 vbc 2/3 vbc 2π iB - iB (a-a²) 2/3 iB iB 3π 14 a c a va vc va a 2/3 vca 2/3 vca 2π - iB iB (a²-1) 2/3 iB iB 7π ... iA iA b c a b a b vb vc va vb va vb -2/3 vab -2/3 vbc 2/3 vab 2/3 vbc π π - iA iA - iA iA 15 16 17 π iA π 18 a c c va vc vc -2/3 vca 2/3 vca π iA - iA (1-a²) 2/3 iA bb a vb vb va a² 2/3 vab 2/3...
... SAc a SBa b SBb c A SBc B SCa SCb C SCc Fig.2.1 Circuit scheme of a three phase to three phase matrixconverter a ,b, c are at the input terminals A ,B, C are at the output terminals With nine bi-directional ... harmonics generated by static converters is provided by input filter using reactive storage elements [20] MatrixConverterAC mains a b ib c Input Filter ia ic Shk A B h = a ,b, c k = A ,B, C C Induction ... Implementation of the MatrixConverter Looking at the basic features of the matrixconverter that have been briefly described in the previous sections it might be surprising to establish that this converter...
... can be three-phase ac and output dc, or both can be dc, or both can be ac From this case, the MC topology is good for universal power conversion such as: AC/ DC, DC /AC, DC/DC, AC/ AC without any change ... maA (t ) mbA (t ) mcA (t ) v a (t ) v (t ) = m (t ) m (t ) m (t ) v (t ) bB cB B aB b vC (t ) maC (t ) mbC (t ) mcC (t ) vc (t ) (2)For input current: ... (4) Where [M (t )] is modulation matrix Simulation result for this control for matrixconverter will be show below S bA S bB S bC S cA S S8 S S S S cB = S S10 ⋅ S S S...
... OVERVIEW Background information Proposed converter Results to-date Conclusion The University of Sheffield Electrical Machines & Drives Research Group eBook for You • • • • BACKGROUND INFORMATION ... lossless snubbers, ZVS in both legs CONVENTIONAL CONVERTERS – VSI 16 • Advantages • Disadvantages eBook for You Many power control methods, some with ZVS or ZCS, stray capacitances can be utilised ... Stray inductances can be utilised Large current harmonics at line side, non-unity power factor Bulky and unreliable DC link capacitor The University of Sheffield Electrical Machines & Drives Research...
... SPICE-compatible simulation packages belong to this class, along with SIMULINK Nevertheless, by recognising the switching nature of circuits, simulation accuracy about the switching events can be improved ... the tank circuit by the power supply in the case of parallel tank circuits This is because the parallel circuit allows a large amount of reactive power to circulate between the capacitor and the ... State-of-the-art of matrixconverter technology 74 2.4.1 Introduction .74 2.4.2 Background to matrixconverter technology 75 2.4.3 Single-phase AC- AC converters .78...