Advanced Electrical and Electronics Engineering: Volume 2 by Yi An Cui, En Ming Xiang (auth.), Jian Lee (eds.)

By Yi An Cui, En Ming Xiang (auth.), Jian Lee (eds.)

2010 First overseas convention on electric and Electronics Engineering was once held in Wuhan, China December 4-5. complex electric and Electronics Engineering booklet comprises seventy two revised and prolonged examine articles written by way of well-known researchers partaking within the convention. issues coated comprise, energy Engineering, Telecommunication, regulate engineering, sign processing, Iintegrated circuit, digital amplifier, Nano-technologies, Circuits and networks, Microelectronics, Analog circuits, electronic circuits, Nonlinear circuits, Mixed-mode circuits, Circuits layout, Sensors, CAD instruments, DNA computing, Superconductivity circuits. electric and Electronics Engineering will provide the kingdom of artwork of great advances in electric and Electronics Engineering and likewise function an outstanding reference paintings for researchers and graduate scholars operating with/on electric and Electronics Engineering.

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69kV rated voltage to the 35kV collect circuit voltage, wind farm collector line length 5km, the collect circuit connected with wind farm substation to set-up voltage 110kV and connected 16km lines to 110 grid hebei province. (a) collect circuit 320 (b) collect circuit 322 Fig. 4. 1 Wind Turbine Type We assume that the active power of squirrel-cage induction generator and double-fed induction generator is similar. 5km distance k1 and k2 away from the collect circuit 320 and 322, In this case, we operated the wind all generators with maximum active power output.

The effect of the location L on the reverse recovery time trr Fig. 5. The effect of the location L on the forward voltage drop VF With the increasing of the location L from 30 μ m to 60 μ m the reverse recovery time trr decreases from 450ns to 380ns. When the location L is 60 μ m ( center of I region), the reverse recovery time trr is minimum. With the increasing of the location L from 60 μ m to 120 μ m , the reverse recovery time trr increases from 380ns to + + 430ns. When the diodes are cut-off, holes and electrons near the P region and N region can be extracted rapidly, while the carriers in the middle of I region can not be extracted but recombined, which needs a long time.

The leakage current I R is increased rapidly with the decline of minority carrier lifetime τ P . When the lifetime τ P is declined to 1×10−7 s, the leakage current I R continues increase. Considering the relationship between the forward voltage drop VF and the leakage current IR, the overall minority carrier life- time τ P is identified as 1 × 10 s. In conclusion, based on the comprehensive consideration of the forward voltage drop VF , the reverse leakage current I R and the reverse recovery time trr, the optimal ∗ −7 parameters of diode are as follows, (1) the location of low lifetime region L is 60μm, Optimization Design of Lifetime Distribution in Power Diode (2)the minority carrier lifetime of low lifetime region τ P* 43 is 10ns, (3) the minority carrier lifetime of allover region τ P is 100ns.

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