针对目前我国钢结构设计采用的基于结构构件可靠度的设计方法,指出其不足即设计出来的结构的可靠度水平不明确、用钢量较大等.并引出了基于结构整体可靠度的设计新方法,该方法的特点是使设计出来的结构有一个明确的可靠度水平.给出了一个按传统方法设计出来的结构,并且按照基于结构整体可靠度的设计方法对其进行了优化.同时给出了优化过程中注意事项,结果表明优化后的结构用钢量较省.%With the development of the power network, DC engineering and new energy project construction, more and more facilities such as switching power supplies, thyristor devices, wind generators have been applied in the power system. But the produce of the harmonic current can also cause overload of the neutral current in the power system at the same time, affect the transmission capacity of the power system. So the test to the system harmonic monitoring is an indispensable part of the power system. At present, the method of voltage harmonic test is connecting directly to the Capacitor Voltage Transformer ( referred to CVT) in the secondary side with the harmonic analyzer. Without considering the ratio of each frequency band of the harmonic wave in the power of the change is different after passing the CVT, so there are certain distortion when inverting the real harmonic wave in the power system. A design and development of harmonics monitoring system considering wide-band transfer characteristics of CVT based on Lab VIEW is proposed, it can invert the real harmonic exactly through the testing, so it has very good practical value. According to the analysis of the measuring data provides a more accurate basis for the harmonic management in the power system, so it is better to improve the stability of the power system.
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