邻近直流输电落点的城市电网谐波传导特性分析  

Analysis Research on Harmonic Transmission Characteristics of Urban Power Network Adjacent to UHVDC Terminal Location

作　　者：陈甜甜[1] 胡蓉[2] 金祖洋 杨洪耕[3] 

机构地区：[1]国网上海市电力公司电力科学研究院,上海市虹口区200437 [2]华东电网有限公司,上海市黄埔区200120 [3]四川大学电气信息学院,四川省成都市610065

出　　处：《电网技术》2015年第10期3000-3004,共5页Power System Technology

摘　　要：根据交直流互联电网出现的直流落点谐波从高电压级向低电压级的传导过程和低电压级非线性负荷谐波向高电压级的扩散过程的不同,提出了一种基于等效注入电流的城市电网谐波传导特性分析方法,将两种情况下的谐波电流在谐波国标框架下统一,得出一致行为评价。注意到城市电网电缆大量使用带来的高次谐波放大,提出潮流谐波比作为输送单位基波潮流的谐波含量评价指标,用以评价由电网参数变化以及电缆使用带来的谐波变化。应用所提方法计算了在某直流落点从500 k V变电站到10 k V母线谐波传导过程,并与实测数据相比较,揭示了谐波从高电压级向低电压级的传导规律和分析了城市电网电缆使用引起的谐波放大,验证了方法的有效性。On basis of difference between harmonic conduction in ±800 kV UHVDC terminal location from high to low voltage level in AC system and harmonic propagation of nonlinear loads from low to high voltage level, a method based on equivalent injection current is proposed to analyze transmission characteristics of harmonics in urban power networks. Harmonic currents in the two cases are unified under framework of national harmonic standard to perform consistent behavior evaluation. Noting that widely used cables in urban power network bring higher harmonic amplification, harmonic current-power flow ratio is used as index to evaluate harmonic content when a unit of fundamental power flow is delivered, to show changes of harmonics caused by variation of power grid parameters and usage of cables. The proposed method is used to calculate harmonic conduction of a ±800 kV UHVDC terminal location from 500 kV substations to 10 kV bus in AC system. Simulation results compared with field measured data reveal harmonic conduction regularity from high to low voltage level with harmonic amplification caused by urban power network cables, and confirm the effectiveness of the method.

关 键 词：谐波 等效注入 潮流谐波比 传导特性 感容耦合 

分 类 号：TM76[电气工程—电力系统及自动化]