摘要
针对直流微电网中直流微电源输出不稳定造成的网内功率不平衡及直流母线电压大范围波动问题,基于含光伏阵列和储能系统的直流微电网系统,提出了一种储能系统自动充放电改进控制策略。该控制策略将直流母线电压用4个电压临界值分成5个区域,控制系统根据直流母线电压所处区域自动判断储能系统的工作模态和模态切换,实现储能系统在充电、放电及空闲模式间自由切换;同时避免了由于直流母线电压正常波动引起的储能系统充放电频繁切换对蓄电池造成的损害。dSPACE实验验证了该策略的可行性。
In allusion to the power unbalance intra-microgrid and the wide fluctuation of DC bus voltage due to unstable output of DC micro resources in DC microgrid, based on the DC microgrid system composed of photovoltaic array and energy storage system an improved automatic charging/discharging control strategy for the energy storage system is proposed. The proposed control strategy divides the DC bus voltage into five ranges by four critical voltage values, and according to the range, where the DC bus voltage belongs to, the operating mode of the energy storage system can be automatically judged and the switching over among operating modes can be automatically performed as occasion requires, thus the energy storage system can be freely switched among charging, discharge and idle modes, and the damage of the battery caused by the frequent switching over between charging and discharging modes due to ordinary fluctuation of DC bus voltage can be avoided. The feasibility of the proposed control strategy is valid by results of dSPACE experiments.
出处
《电网技术》
EI
CSCD
北大核心
2014年第7期1827-1834,共8页
Power System Technology
基金
国家自然科学基金资助项目(51277127)~~
关键词
直流微电网
母线电压
储能系统
自动充放电
DC microgrid
bus voltage
energy storage system
automatic charging and discharging
