具有公共低压直流母线电压支撑功能的储能单元SOC自动均衡控制策略  

Energy Storage Unit State-of-charge Automatic Equalization Control Strategy With Common LVDC Bus Voltage Support Function

作　　者：曾国辉[1] 朱相臣 曾志伟 廖鸿飞 赵晋斌 ZENG Guohui;ZHU Xiangchen;ZENG Zhiwei;LIAO Hongfei;ZHAO Jinbin(Shanghai University of Engineering Science,Songjiang District,Shanghai 201600,China;Shanghai University of Electric Power,Yangpu District,Shanghai 200082,China)

机构地区：[1]上海工程技术大学,上海市松江区201600 [2]上海电力大学,上海市杨浦区200082

出　　处：《中国电机工程学报》2022年第19期7160-7169,共10页Proceedings of the CSEE

基　　金：国家自然科学基金项目(52177184)。

摘　　要：在新能源组网运行中,储能单元荷电状态均衡与公共点电压质量是系统高质量运行的关键指标。由于线路电阻不匹配,导致各分布式储能单元出现荷电状态差异,造成储能单元过充或过放,缩短储能单元使用寿命。线路电阻的存在还会影响公共低压直流母线电压幅值。为了解决新能源组网系统中线路电阻对储能单元荷电状态及母线电压质量的影响,在前期工作基于变换器输出电压电流纹波分析的阻抗检测方法之上,提出一种弱通信下的储能单元荷电状态自动均衡及直流母线电压支撑改进控制策略。该方法将线路电阻及储能单元荷电状态作为控制参数补偿至传统下垂控制中,只需在弱通信条件下即可实现储能单元荷电状态自动均衡控制及公共点电压支撑的控制效果。进一步针对通信中断情况提出改进控制方式,可提高新能源组网运行的可靠性。最后,通过RT-LAB半实物实验,验证系统在正常工况下的有效性以及在通信中断、负荷突变等情况下的正确性与有效性。In the operation of new energy networking, SOC balance and common point voltage quality are the key points of high quality operation. SOC automatic equalization of energy storage unit can effectively avoid over discharge of energy storage unit and prolong the service life;the voltage quality of common LVDC bus voltage is an important for the measure of quality of power system. In order to solve the influence of line resistance on SOC and common point bus voltage quality of energy storage unit in system, on the foundation research of impedance detection method based on output voltage and current ripple analysis of converter, this paper proposed SOC automatic equalization and common point voltage support control of energy storage unit under weak communication. The control effect under weak communication and communication fault conditions was realized. It improved the reliability of new energy network operation. Through the RT-LAB hardware in the loop experiment, the feasibility of the proposed method in normal conditions and in the case of communication interruption and load mutation were verified.

关 键 词：储能变换器 荷电状态自动均衡 弱通信 电压支撑 

分 类 号：TM73[电气工程—电力系统及自动化]