| 引用本文: | 耿英明,侯梅毅,朱国防,刘洋,于昊,呼延天亮.基于虚拟阻抗的微电网有功均分阻性下垂控制策略[J].电力自动化设备,2020,40(10): |
| GENG Yingming,HOU Meiyi,ZHU Guofang,LIU Yang,YU Hao,HUYAN Tianliang.Resistive droop control strategy of active power distribution for microgrid based on virtual impedance[J].Electric Power Automation Equipment,2020,40(10): |
|
| 摘要: |
| 低压微电网中连接线参数不等使得并联逆变器输出功率存在偏差。针对低压微电网的线路特性，忽略线路电抗后采用阻性下垂控制方法实现功率解耦，同时增加虚拟负感抗抵消逆变器的等效输出感抗，进一步提高功率解耦控制的准确性。在此基础上，提出了一种基于本地信息的自适应虚拟电阻控制方法以减小有功偏差，利用本地逆变器输出的有功功率和电压作为馈入信号自适应地调节虚拟电阻取值，通过有功功率偏差方程揭示了其作用机理，并利用小信号稳定性分析对虚拟电阻系数的取值进行了优化设计。在仿真和实验平台中与已有控制策略进行对比，结果表明所提控制策略能够在提高有功均分精度的同时减小电压降，无需通信系统更有利于实现微电网的“即插即用”。 |
| 关键词: 低压微电网 阻性下垂控制 自适应虚拟电阻 虚拟负感抗 有功分配 |
| DOI：10.16081/j.epae.202008021 |
| 分类号:TM464;TM761 |
| 基金项目:国家自然科学基金资助项目(51877126) |
|
| Resistive droop control strategy of active power distribution for microgrid based on virtual impedance |
|
GENG Yingming, HOU Meiyi, ZHU Guofang, LIU Yang, YU Hao, HUYAN Tianliang
|
|
School of Electrical Engineering, Shandong University, Jinan 250061, China
|
| Abstract: |
| The output power deviation of paralleled inverters is existed because of the unequal parameters of feeder lines in low-voltage microgrid. According to the characteristics of low-voltage lines of microgrid, after ignoring the line reactance, the resistive droop control strategy is used to realize power decoupling. At the same time, the virtual negative inductive reactance is added to cancel the equivalent output reactance of the inverter, further improving the accuracy of the power decoupling control. On this basis, an adaptive virtual resistance control method based on local information is proposed to reduce the deviation of active power. The value of virtual resistance is adaptively adjusted by using the active power and voltage output from the local inverter as the feeder signal. The function mechanism is revealed by the active power deviation equation, and the value of virtual resistance coefficient is optimized by small signal stability analysis. Compared with the existing control strategies in the simulation and experiment platform, the results show that the proposed control method can improve the accuracy of active power sharing while reducing the voltage drop. And without communication, it is more conducive to realize the “plug and play” of microgrid. |
| Key words: low-voltage microgrid resistive droop control adaptive virtual resistance virtual negative inductive reactance active power distribution |
