500kV和220kV系统电压谐波水平之间的关系探讨

通过对典型接线电网的计算，分析了500KV和220KV系统之间的谐波渗透关系，计算了各系统之间的谐波电压传递系数Th1h。结果表明，对于220KV及以下电压等级系统，低一级系统与高一级系统的传递系数Th1h远小于1.0，而且随着电压等级的升高而变小，这符合通常的规律；但220KV与500KV系统之间的Th1h则接近于1.0，且与通常的规律相悖。据此，文章指出，对于最高电压等级500KV系统的谐波电压限值标准应特殊考虑。

ELATIONSHIP BETWEEN HARMONICS VOLTAGE LEVELS OF 500kV AND 220kV NETWORK

Through the calculation of 500kV and 220kV power networks with typical connection the harmonicinfiltration between the two networks is analyzed, and theharmonic voltage transfer coefficients of them are calculated respectively. The calculation results show that for the powersystem of 220kV and lower voltage the harmonic voltagetransfer coefficient between adjacent voltage class networks is far less than 1.0, with the rise of voltage class the harmonic voltage transfer coefficient always decreases, this phenomenon coincides with usual law, but the harmonic voltage transfercoefficient between 220kV network and 500kV network isclose to 1.0, it does not coincide with usual law. Therefrom, for 500kV power system which is the highest voltage class inChina its harmonic voltage limit should be particularlyconsidered.