Tài liệu Power Electronic Handbook P21 docx

... electrical loads in the MEC power systems. As is described in Refs. 5 through 8, most of the future electic loads require power electronic controls. In future automobiles, power electronics will be used ... areas of power electronics and electric motor drives along with fault-tolerant electrical distribution systems and control electronics enable the transforming of present automoti...

Ngày tải lên: 13/12/2013, 00:15

... for power electronics systems. Obviously, advances in raw processing power for personal computers as well as the rapid devel- opment of electronic design software have influenced the field of power ... the simulation of power electronics systems proved to be difficult from the outset, because power electronics circuits typically operate in a highly discontinuous mode, with power se...

Ngày tải lên: 13/12/2013, 00:15

... compensation • Increase the power angle, i.e., phase shift One can also reverse the power flow by changing the sign of the power angle; i.e., a positive power angle will correspond to a power flow from sending ... controller. © 2002 by CRC Press LLC today’s power systems. This chapter describes specifically the Unified Power Flow Controller known as the UPFC. This power electr...

Ngày tải lên: 13/12/2013, 00:15

... of power electronics circuits. The most widely accepted definition of a power electronics circuit is that the circuit is actually processing electric energy rather than information. The actual power ... are connected to loads, which require either reactive power or effective power feedback. In the case of reactive power, the direction of the power flow in the converter changes peri...

Ngày tải lên: 25/01/2014, 13:20

... (1791–1867) experimented with magnetic fields. He wound two coils on an iron ring. When one coil was powered from a battery, he noticed that a transient voltage developed on the second coil and, later,

Ngày tải lên: 13/12/2013, 00:15

... Kessinger, J. P., Advanced power electronics as an enabler of unbundled power quality services, in Proceedings of the NSF Conference on Unbundled Power Quality Services in the Power Industry, Key West, ... information about the power supply and other factors can be sent between a customer and a power company. For example, information of power system restoration can be sent...

Ngày tải lên: 13/12/2013, 00:15

... PCU output power. When the PCU output power reaches a maximum level, the input resistance is fixed at the value that produces this level. Presumably when output power is a maximum, input power is ... maximum power from the array. This is done by incorporating maximum power- tracking circuitry into the PCU. Figure 18.4 shows the I – V characteristics of an array with the max...

Ngày tải lên: 13/12/2013, 00:15

... displacement power factor yields the total power factor, 0.75 in this case. Thus, the incandescent lamp, a resistive load, appears to the power system as a 0.75 power factor lagging load. Low power ... it is possible to achieve a power factor greater than 0.99 and a THD less Power factor Average power Apparent power 1 T v s t()i s t() 0 T ∫ V rms I rms == Power factor...

Ngày tải lên: 13/12/2013, 00:15

... 5th European Conference on Power Electronics and Applications, Brighton, U.K., 1993, 134. 8. Seki, N. and Uchino, H., Converter configurations and switching frequency for a GTO reactive power compensator, ... high- power voltage source inverters, IEEE Trans. Power Electron., 7, 189, 1992. © 2002 by CRC Press LLC 25. Corzine, K. A., Delisle, D. E., Borraccini, J. P., and Baker, J. R., M...

Ngày tải lên: 25/01/2014, 13:20

... larger power applications, typically above 1.5 kW, it is advisable to use a higher power supply. In some applications, two of the three phases of a three-phase power system are used as the source powering the ... CRC Press LLC 3. AC power systems can be interconnected employing a DC tie without reference to system frequen- cies, short circuit power, etc. 4. High-speed control of DC...

Ngày tải lên: 25/01/2014, 13:20