摘要
直流微网中可控性逐渐增强的源-储-荷需要高效的协调方法充分发挥其并网支撑潜力,将可控负荷、风机向储能归类处理后,使其虚拟出储能设备的充放电响应,便于提升系统的能量管理及运行能力。分析了可控负荷、风机旋转动能与电容储能间的转换关系,分别建立源于负荷和风机的虚拟储能模型。考虑负荷收益、储能折损和调风成本,建立基于虚拟储能的源储荷协调优化模型,计算不同时段的虚拟电容值,以实现系统长期经济运行。在此基础上,通过划分直流微电网的运行区域,提出虚拟储能的协调控制方法,以提高系统的电压稳定性。通过搭建直流微电网仿真系统,仿真结果表明,所提控制策略可显著提高微电网的经济效益和直流电压稳定性。
In the DC microgrid,the increasingly controllable source-storage-load requires an efficient coordination method to give full play to its grid-connected support potential.After the controllable load and fan are classified into energy storage,the charge and discharge response of the energy storage device can be virtualized,which is convenient to improve the energy management and operation capability of the system.In this paper,firstly,the conversion relationship between the rotational kinetic energy of the controllable load,the fan and the energy of super capacitor is analyzed,and the virtual energy storage models derived from the load and the fan are established respectively.Secondly,to achieve long-term economic operation of the system,a sourcestorage-load coordination optimization model based on virtual energy storage is established considering load gains,energy storage losses and wind regulation costs to calculate virtual capacitance values in different periods.Furthermore,by dividing the operating area of the DC microgrid,a coordinated control method for virtual energy storage is proposed to improve the voltage stability of the system.Finally,based on a typical DC microgrid simulation system,it is verified that the proposed control strategy can improve the economic benefits of the microgrid and the stability of the DC voltage significantly.
作者
张祥宇
王玉珂
付媛
ZHANG Xiangyu;WANGYuke;FU Yuan(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Baoding 071003,Hebei,China)
出处
《电网与清洁能源》
北大核心
2022年第5期109-119,共11页
Power System and Clean Energy
基金
河北省重点研发计划项目(19214405D)。
关键词
虚拟储能
源储荷协调
分层控制
超级电容
直流微电网
virtual energy storage
source-storage-load coordination
hierarchical control
super capacitor
DC microgrid
