摘要
当长期运行于并网状态的微电网转为孤岛运行时,若微电源和储能元件容量不足以保证微电网内所有负荷的正常供电,为最大限度地保证重要负荷供电不中断,需要切除微电网部分负荷。本文提出一种基于储能剩余电量预估的微电网切负荷策略,根据微电网孤岛运行期间微电源发电功率和负荷用电功率的预测值,对储能装置储电量进行预测估计和比较分析,按照微电网实时功率平衡原则和负荷分级体系,优化确定不同级别负荷的投切时刻,以保证微电网内重要负荷的持续供电和其余各级负荷停电时间最短。建立基于该切负荷策略的算例微电网仿真系统,仿真结果表明此策略的正确性和有效性。
When grid-connected microgrid operates in isolated mode for long time, and the capacity of micro electric source and energy storage device cannot ensure the power supply for all loads in microgrid, it is necessary to remove part loads in micro grid in order to guarantee the power supply of the more important loads. The load shedding strategy of microgrid based on the surplus energy evaluation of energy storage device was presented to predict and compare the surplus energy of energy storage device according to the predicted power value of micro sources and loads during the island operation of microgrid. According to real-time power balance principle and load classification system of microgrid, this strategy optimized and confirmed the switching time of loads at different level to ensure the continuous power supply of the more important loads of microgrid and the shortest power-off time of the rest loads at other levels. A microgrid simulation system based on the load shedding strategy was established. The simulation results show the correctness and practicability of the strategy.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2016年第6期1431-1438,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51507139)
陕西省重点学科建设专项基金(5X1301)
高等学校博士学科点专项科研基金(20126118110009)
陕西省教育厅科学研究计划(2010JK756)
关键词
微电网
储能
剩余电量
切负荷
microgrid
energy storage
surplus energy
load shedding
