光储柴微电网运行特性分析

微电网既可以并网运行,也可以孤岛运行,而孤岛模式下主控微源对电压和频率调节作用的强弱对微电网能否稳定运行影响显著。基于已搭建的以储能电池为主控微源的光储柴微电网,分别在蓄电池不同荷电状态、负载不同程度扰动、是否投入柴发微源的情况下进行三组对比实验,用三相电能质量分析仪记录相关波形,分析不同实验条件下微电网的运行特性。实验结果表明,蓄电池的荷电状态、负载的扰动情况对微电网的稳态孤岛运行有重要影响;柴发微源的投入会抢占蓄电池对电压和频率调节的主导作用,需对蓄电池容量进行优化配置。根据实验结果,对蓄电池容量进行了优化,可以保证蓄电池的主导作用。

Analysis of the operating characteristics of a PV-Diesel-BESS microgrid system

Microgrid can operate in either grid-connected mode or island mode. When in island mode, the ability of master micro-source to regulate voltage and frequency has a significant impact on the stable operation of microgrid. This paper is based on the built PV-Diesel-BESS microgrid with storage batteries as the master micro-source. Three groups of comparative experiments are conducted, respectively in different state of charge, different load disturbance and whether connecting the diesel into the microgrid. Relevant waveforms are recorded using three-phase power quality analyzer to analyze operating characteristics of microgrid under different experimental conditions. Experimental results show that the state of charge and load disturbance have important effects on stable operation of microgrid in island mode. The diesel will occupy the leading role in regulating voltage and frequency when connected into the microgrid. The capacity of energy batteries need to be optimized. According to the experimental results, battery capacity is optimized to ensure the leading role of energy batteries.