基于储能系统的新型配电台区电能质量治理方法

Governance Method of Power Quality in New Power Distribution Area Based on Energy Storage System

在新型配电台区中,电力电子装置的广泛应用和大量分布式能源的接入,严重影响了台区的电能质量,并造成功率波动。为了改善新型配电台区电能质量和功率波动问题,提出一种基于储能系统的新型配电台区电能质量治理方法。采用该方法改进台区首端储能系统的综合调节能力,不仅可以治理新型配电台区电流谐波、无功和不平衡电流等电能质量问题,而且可以有效稳定台区的有功功率。首先,介绍了新型配电台区的结构和储能系统的拓扑,并搭建数学模型;随后,在控制部分的谐波检测环节采用基于滑动均值滤波器的四线制i p-i q谐波检测法,并且在储能功率调节环节采用考虑储能容量的电池充放电策略;同时,通过重复控制和PI控制准确跟踪控制器生成的指令电流。最后,通过仿真验证表明,所提出的储能系统及其控制策略既可以有效改善新型配电台区的电能质量,又可以平抑台区有功功率波动。

In the new power distribution area,due to the wide application of power electronic devices and the access of a large number of distributed energy sources,the power quality of the new power distribution area is seriously affected and the power fluctuation is caused.In order to improve the power quality and power fluctuation of the new power distribution area,a new power quality management method based on energy storage system is proposed.This method can improve the comprehensive adjusting ability of the energy storage system at the head of the area.It can not only control the current harmonics,reactive power and unbalance current of the new power distribution area,but also stabilize the active power effectively.Firstly,the structure of the new power distribution area and the topology of the energy storage system are introduced,and the mathematical model is built.Then,in the harmonic detection section of the control section,the four-wire ip-iq harmonic detection method based on moving mean filter is adopted.And in the process of energy storage power adjustment,the strategy of battery charging and discharging considering energy storage capacity is adopted.At the same time,the command current is accurately tracked by repetitive control and PI control.Finally,the simulation results show that the proposed energy storage system and its control strategy can not only effectively improve the power quality of the new power distribution area,but also smooth the active power fluctuation.