摘要
利用负荷的可控能力模拟储能设备的能量调节特性,可成为负荷侧提高系统运行能力的可行方案。首先,建立了可控负荷的旋转动能与直流电容储能元件的充放电能量之间的转换关系,阐述了源于可控负荷的虚拟储能的定义;其次,考虑负荷收益和蓄电池寿命损耗,建立了直流微电网的经济性评价模型,分析了虚拟电容值与系统总收益的关系;然后,综合分析了可控负荷调速过程的经济损失和虚拟储能控制过程中的储能折损收益,利用粒子群优化算法求解经济模型,为虚拟电容值提供计算依据,并提出了含虚拟储能的直流微电网储荷协调控制技术;最后,基于典型算例计算不同时段的虚拟电容值,通过对比投入虚拟储能前、后的经济性收益,验证了所提储荷协调控制技术不但能提高系统的功率调节能力,而且可以提高直流微电网的运行经济性。
Using the controllable capacity of load to simulate the energy regulation characteristics of energy storage equipment is a feasible scheme to improve the system’s operation capacity on the load side.Firstly,the conversion relationship between the rotational kinetic energy of controllable load and the charging and discharging energy of DC capacitor energy storage element is established,and the definition of virtual energy storage derived from controllable load is expounded.Then,considering load revenue and battery life loss,the economic evaluation model of DC microgrid is established,and the relationship between the virtual capacitance value and the total system revenue is analyzed.Furthermore,the economic losses in the speed regulation process of controllable load and the loss gains of energy storage in the control process of virtual energy storage are comprehensively analyzed.Particle swarm optimization algorithm is used to solve the economic model to provide the calculation basis for virtual capacitance value,and a coordinated control technology of energy storage-load for DC microgrid with virtual energy storage is proposed.Finally,based on typical examples,the virtual capacitance values at different time periods are calculated,and the economic benefits before and after installing the virtual energy storage are compared to verify that the proposed coordinated control technology can not only improve the power regulation ability of system,but also improve the operation economy of DC microgrid.
作者
张祥宇
吴奇
付媛
ZHANG Xiangyu;WU Qi;FU Yuan(State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources,North China Electric Power University,Baoding 071003,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2021年第1期113-119,共7页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(51607070)
中央高校基本科研业务费专项资金资助项目(2018MS90)。
关键词
直流微电网
虚拟储能
可控负荷
超级电容器
协调控制
DC microgrid
virtual energy storage
controllable load
supercapacitor
coordinated control
