摘要
针对高渗透可再生能源接入的交直流混合配电网经济性和灵活调节性不足的问题,提出一种配合降压变压器(step down transformer,SDT)和电压源型变换器(voltage source converter,VSC)调压策略的含混合储能系统(hybrid energy storage system,HESS)交直流配电网日级别经济运行优化方法。首先,基于有功/无功-电压综合灵敏度对配电网进行分区,确定HESS的接入容量与位置;其次,基于希尔伯特-黄变换(Hilbert-Huang transform,HHT)原理对由锂电池和超级电容构成的HESS进行功率分配;然后,建立了计及HESS全生命周期的运行成本和主网购电成本的交直流混流配电网日级别经济运行优化模型;最后,对该典型二阶锥规划问题进行求解。改进IEEE33节点交直流混合配电网仿真实验表明:在合理选址定容基础上,HESS在平抑系统高频功率信号及经济性上优势明显;HESS联合SDT及VSC电压控制,可以有效降低HESS运行中出现的电压偏离程度,减小了电压约束对HESS充放电过程的影响,并进一步提升了含储能配电网经济运行能力及电压稳定性。
In view of the insufficient economy and flexibility of AC/DC hybrid distribution network with high-permeability renewable energy access,we propose a daily-level optimized operation method of AC/DC distribution network with hybrid energy storage system,which is matched with the voltage regulation strategy of step-down transformer and voltage source converter.First,the HESS access capacity and location are determined on the basis of partitioning the distribution network by active/reactive-voltage comprehensive sensitivity.Secondly,based on the Hilbert-Huang transformation principle,the power distribution of the HESS composed of lithium batteries and supercapacitors is allocated.Then,a daily-level economic operation optimization model of AC-DC mixed-current distribution network is established in which the operating costs of the HESS’s full life cycle and the cost of main power purchase are taken into account.Finally,the typical second-order cone programming problem is solved.Improved IEEE33-node AC/DC hybrid distribution network simulation experiments show that HESS has obvious advantages in suppressing system high-frequency power signals and economy.On the basis of reasonable site selection and capacity,HESS combined with SDT and VSC voltage control can effectively reduce the voltage deviation that occurs during HESS operation,reduce the influence of voltage constraints on the HESS charging and discharging process,and further enhance the economic operation capacity and voltage stability of the distribution network containing energy storage.
作者
张雯雯
魏震波
郭毅
胡蓉
刘俊
蒋拯
ZHANG Wenwen;WEI Zhenbo;GUO Yi;HU Rong;LIU Jun;JIANG Zheng(School of Electrical Engineering,Sichuan University,Chengdu 610065,China;State Grid Loudi Power Supply Company,State Grid Hunan Electric Power Co.,Ltd.,Loudi 417000,China;State Grid Chongqing Electric Power Company,Chongqing 400000,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2022年第2期565-574,共10页
High Voltage Engineering
基金
国家自然科学基金(51807125)。
