In a word, reactive power compensation and harmonic current restrain have become one of the most important problems.
总之，无功功率的补偿和谐波电流的抑制已经成为港口电气系统设计中最重要的问题之一。
When reactive power is unbalance, it will cause some problems, such as lower voltage, worsen voltage quality, lower power factor and increase line loss.
当无功功率不平衡时，将会导致系统电压降低、电能质量下降、功率因数降低、线损增加等问题。
Aiming at the problems existing in present voltage and reactive power control device of substation, puts forward a reactive power control project.
针对现有变电站电压、无功控制装置存在的问题，提出了一种电压无功控制方案。
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