大容量SVC相控电抗器对站用低压直流电源的影响分析及防范措施

Analysis on Influence of Large Capacity SVC Reactor on Low Voltage DC Power Supply for Station and Preventive Measures

大容量静态无功补偿装置(static var compensator,SVC)相控电抗器对站用低压直流电源影响问题特殊且严重。为深入了解SVC对厂站低压直流电源的影响,对某变电站SVC现场设备进行实测,进而对SVC及附近区域建立三维电磁场仿真模型。通过与现场的实测值进行对比,并在实验室建立等比例模型验证仿真的等效性,在此基础上分析在电抗器敷设不同的屏蔽材料对直流电源电能质量改善情况以及带来的衍生问题。结果表明:大型SVC相控电抗器对厂站低压直流电源的影响已超过规程允许值,而敷设硅钢片、铝板、铁板均可有效降低干扰,并且带来的电感变化、发热等情况在可接受范围内。

The influence of phase controlled reactors of a large capacity SVC on the low voltage DC power supply of a power substation can be very serious.In order to understand this influence,field measurement of SVC is carried out in a substation.Furthermore,a three-dimension electromagnetic field simulation model is established for SVC and its adjacent area.A full-scale model is established in the laboratory to verify the equivalence of the simulation results through comparison with the field measurement.An analysis is made on the improvement of DC power quality brought about by different shielding materials and related problems.The results show that the influence of phase controlled reactors of a large capacity SVC on the low voltage DC power supply of a power substation has exceeded the allowable value stipulated by relevant code,and the layout optimization of silicon steel sheet,aluminum plate and iron plate can effectively reduce the interference,and the resulting inductance change and heating are acceptable.