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论文作者:留学生论文论文属性:短文 essay登出时间:2011-04-19编辑:点击率:20958
论文字数:5901论文编号:org201104191725059753语种:中文 Chinese地区:中国价格:免费论文
关键词:Supply HarmonicsElectricity sinusoidal voltagesvoltages
components only and not the full load current of the circuit.
supply
transformer
active filter
nonlinear load
pcc
Fig. 7.10 Parallel active filter configuration
Series active filters
The main circuit configuration for this type of active filter is shown in Figure 7.11. The
idea here is to eliminate voltage harmonic distortions and improve the quality of the
voltage applied to the load. This is achieved by producing a sinusoidal pulse width
modulated (PWM) voltage waveform across the connection transformer, which is added to
the supply voltage to counter the distortion across the supply impedance and present a
sinusoidal voltage across the load.
S7: Supply Harmonics
130 EEE8044: Fundamentals
supply
transformer
active filter
nonlinear load
filter
transformer
Fig. 7.11 Series active filter configuration
Summary
In this unit we have studied and analysed the problem of harmonics from an engineering
perspective. Customers and end-users, however, are concerned only with two aspects of
supply quality. They want power on demand and they want it to do a certain job.
Harmonics are unimportant to a customer if they do not cause any problems. However,
they are regarded as totally unacceptable if they interfere with equipment or produce even
small levels of noise or operational problems.
Harmonics create problems for only a small number of customers, but when they occur, the
problems are usually severe and solutions very expensive. Distribution systems with near
perfect power quality can of course be built but at a very high cost, which customers may
not be willing to pay. The issue for an electricity company is to build and operate a
network whose cost and power quality meet customer needs. Or, in today’s competitive
electricity market, it is to achieve the best price/quality combination.
References and Further Reading
1. IEEE Std 519-1992 (1993) IEEE Recommended Practices and Requirements for
Harmonic Control in Electrical Power Systems, IEEE, New York, USA.
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