本文通过分析无功功率平衡和电压水平的关系，指出了电力系统电压调整的复杂性，然后讨论了变电站电压无功控制的原理，给出了控制的数学模型。

In this paper the complexity of voltage control in power system is discussed through the analysis of relationship between power system balanced states of voltage and reactive power.

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摘要：变电站是电力系统中转换电压、接受和分配电能、控制电流走向和调整电压的电力设施。

Abstract: : the substation is in power system voltage conversion, accept and electric power distribution, control and adjustment to the current voltage power facilities.

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实际应用表明，系统在无人值守情况下可自行调整并稳定调压器输出电压，可满足电子加速器调压器的精确控制和自动控制要求。

It is shown in practice that the system can adjust the variac output voltage automatically and assure the accurate and automatic control of the electronic accelerator.

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