补偿电网阻尼率及脱谐度研究

Study on Damp Rate and Out-of-resonance of Power Compensation Network

随着自动调谐式消弧线圈的广泛应用 ,许多配电网变成了补偿电网 ,而阻尼率和脱谐度是补偿电网的 2个重要参数。文章从中性点位移电压、三相电压不平衡和残流的有功分量、无功分量等分析了阻尼率和脱谐度对补偿电网运行特性的影响 ,认为 :采用非线性电阻将增大残流的有功分量 ,不利于电弧的熄灭 ;在保证残流小于规程允许的范围内 ,适当增大脱谐度 ,可改善三相电压不平衡度 。

Along with the extensive application of automatically resonant arc suppression coil some power distribution networks became the compensation ones. Damp rate and out-of-resonance degree are two important parameters of the power compensation network. The paper analyses some influence of power compensation network operation characteristics due to the changes of damp rate and out-of-resonance in some aspects, such as neutral-to-ground voltage, unbalanced degree on the 3-phase voltages and component of residual current. It concludes that the adding active components of residual current adopted by nonlinear resistance will make against to suppress the grounding arc, and that the proper accretion of out-of-resonance degree will improve the unbalanced degree on the 3-phase voltages based on residual current within the scope of regulation permissions.