A decentralized control method for frequency restoration and accurate reactive power sharing in islanded microgrids

作者：Zhang, Zhanqiang; Dou, Chunxia^*; Yue, Dong^*; Zhang, Bo; Luo, Wei

来源：Journal of the Franklin Institute, 2018, 355(17): 8874-8890.

DOI：10.1016/j.jfranklin.2018.09.024

• PATTERN-RECOGNITION APPROACH
• TRANSIENT SIGNALS
• VOLTAGE CONTROL
• SYSTEM

To achieve the frequency restoration (FR) and accurate reactive power sharing (RPS) in islanded microgrids (MGs), an improved P-f droop control is proposed. Firstly, the inverter impedance, whose value is set by the virtual impedance method, is used to minimize the impact of line resistance on powers coupling and RPS. Then, in order to restore the frequency of distributed generations (DGs) to the rated value, the reference is changed for compensating the frequency deviation (FD) caused by loads change. And the fast FR rate is achieved under a large constant k. Besides, in order to eliminate the inaccuracy of RPS caused by voltages difference (VD), the line voltage drop (LVD) is used to compensate the voltage droop characteristics. The use of voltage feedback ensures that the obtained voltage is desired after the LVD compensation. Finally, the simulation in RT-LAB indicates the effectiveness of proposed method in an islanded MG model.

• 出版日期2018-11
• 单位燕山大学; 中国科学院电工研究所; 南京邮电大学