Var optimization is core problem of voltage stability and economic operation of electric power system, also important measure to improve voltage quality.

无功优化是电力系统电压稳定与经济运行的核心问题，也是提高电力系统电压质量的重要措施。

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The electronic equipment is widely applied to aircraft electric power system, so power quality problems in AC main power supply system cause more and more attention.

在飞机电气系统中，随着电力电子装置的广泛应用，交流供电系统的电能质量问题受到越来越多的关注。

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To improve the electric power quality, a monitoring and analyzing system must be established to detect, estimate and classify different disturbances.

为了采取合理的措施提高电能质量，必须建立电能质量监测分析系统，对其进行正确地检测、评估和分类。

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