电网谐波的危害及抑制技术（Harm and suppression technology of harmonic in power grid）.docVIP

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电网谐波的危害及抑制技术（Harm and suppression technology of harmonic in power grid）.doc

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电网谐波的危害及抑制技术（Harm and suppression technology of harmonic in power grid）

电网谐波的危害及抑制技术（Harm and suppression technology of harmonic in power grid） With the development of industry, agriculture and the improvement of peoples life, in addition to the exponentially growing electricity needs, more and more requirements on power quality and power supply reliability, power quality (PowerQuality) is increasingly recognized by people. For example, if the computer system of large-scale production line, industrial production in large airports, commercial buildings, large hospitals and other important occasions, the loss of electricity, or due to electromagnetic interference power network transient effect, the computer system can not run normally, it will bring enormous economic losses. Elevator, air conditioning, TV, computer, frequency conversion equipment copiers, electronic ballast fluorescent lamp has become a part of peoples daily life, if these devices can not operate normally, will disrupt peoples normal life. However, televisions, computers, copiers, electronic lighting equipment, inverter, switch power supply, electric arc furnace load are mostly nonlinear loads, harmonic sources, such as the harmonic currents injected into the utility grid, the inevitable pollution of the utility grid, so that the utility grid power waveform distortion, increase harmonic component. In recent years, sensing technology, optical fiber, microelectronics, computer technology and information technology are maturing. The microelectronic technology with higher integration degree makes the calculator function more perfect, and the volume is smaller and smaller, so that the control of all kinds of electrical equipment is developed to the intelligent controller. With the improvement of microelectronic technology integration, the operating voltage of microelectronic devices becomes lower, the withstand voltage level is lower, and it is more susceptible to external electromagnetic interference, leading to damage or malfunction of the control unit. For example, in 1970s