三相负荷不平衡能耗及综合平衡治理关键技术研究

Research on Key Technologies of Unbalanced Energy Consumption and Comprehensive Balance Treatment of Three-phase Load

针对目前配电网普遍存在的三相不平衡问题,该文在系统分析各环节模型特点的基础上,建立了系统能耗仿真模型.仿真结果表明:低压线路损耗所占比例最大,且随着不平衡度增加损耗增速增大;变压器损耗量虽然较大,但不平衡对变化量的影响相对较小,而高压线路损耗所占比例最小.在上述理论分析基础上,进一步对比不同平衡调节技术特点及平衡效果,提出了换相开关与SVG技术相结合综合补偿方法,此种方法不但可以有效改善低压线路损耗,同时可实现配网平衡的最优调整,并进一步通过仿真验证了此方法的正确性与合理性.

Aiming at the current three-phase unbalance problem in distribution network,this paper establishes a system energy consumption simulation model based on the system analysis of the characteristics of each link model.The simulation results show that the low-voltage line loss accounts for the largest proportion,and with the imbalance increasing the loss growth rate is higher;although the transformer loss is large,the imbalance has a relatively small influence on the variation,and the high-voltage line loss accounts for the smallest proportion.On the basis of the above theoretical analysis,and further comparing the characteristics of different balance adjustment techniques and the balance effect,this paper proposes a comprehensive compensation method combining the commutation switch and SVG technology.This method can not only effectively improve the low-voltage line loss,but also achieve the balance of the distribution network.The correctness and rationality of this method are further verified through simulation.