HHUPFC在环网线路中的潮流调节应用

由于输电线路阻抗参数分布不均匀,电网潮流的自然分布往往不符合理想分布,有效调节线路潮流分布才能充分挖掘现有电网的潜力,减少新建输电线路的成本。文章在介绍高压混合式统一潮流控制器(HHUPFC)结构、电压调节原理的基础上,计算了HHUPFC在单条输电线路上的潮流调节性能。从理论上推导了HHUPFC接入环网后,HHUPFC对环网的潮流调节作用。通过在IEEE30节点系统的仿真,验证了HHUPFC在环网线路中的潮流均衡作用,HHUPFC可将IEEE30节点系统中输电通道 “4-12”和“9-10”的潮流不平衡度从82%减小到3%。仿真结果表明,在达到同样的潮流调节效果时,相比于传统混合式统一潮流控制器(HEUPFC),文中采用的HHUPFC可将二次绕组成本减少70%、UPFC容量减少55%、有载调压开关成本减少39%。在广东某220kV环网中也验证了HHUPFC的潮流调节作用。

Power Flow Regulation Application of HHUPFC in Ring Network Transmission Lines

Due to the uneven distribution of impedance parameters of transmission lines, the natural distribution of power flow in the grid usually does not conform to the expected distribution. The potential of power grid can be fully exploited and the cost of new transmission line can be reduced by using effective power flow regulating device. Based on the introduction of the structure and voltage regulation principle of the High-voltage Hybrid Unified Power Flow Controller, the power flow regulation performance of HHUPFC on a single transmission line in this paper is calculated. After the HHUPFC is connected to ring network transmission lines, the power flow regulation effect of HHUPFC is theoretically deduced. Through the simulation of IEEE30 bus systems, the effect of HHUPFC on power flow equilibrium in the ring network lines is verified. HHUPFC can reduce the power flow imbalance of transmission channels "4-12" and "9-10" in IEEE30 bus system from 82% to 3%. The simulation results show that when the same power flow regulation effect is achieved, compared with the traditional HEUPFC, the HHUPFC used in this paper can reduce the cost of secondary winding by 70%, the capacity of UPFC by 55%, and the cost of on-load tap changer is reduced by 39%. The power flow regulation function of HHUPFC is also verified in a 220kV ring network in Guangdong power grid.