Reactive power and voltage control strategy based on dynamic and adaptive segment for DG inverter

2017 6th International Conference on Power Science and Engineering

Zhai, Jianwei^1 ; Lin, Xiaoming^1 ; Zhang, Yongjun^1

School of Electrical Power, South China University of Technology, Guangzhou

510640, China^1

关键词: Active distribution network (ADN);    Control strategies;    Control voltages;    Distribution feeders;    Reactive voltages;    Terminal voltages;    Voltage control strategies;    Voltage variation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/136/1/012012/pdf
DOI  :  10.1088/1755-1315/136/1/012012

来源: IOP

【 摘 要 】

The inverter of distributed generation (DG) can support reactive power to help solve the problem of out-of-limit voltage in active distribution network (ADN). Therefore, a reactive voltage control strategy based on dynamic and adaptive segment for DG inverter is put forward to actively control voltage in this paper. The proposed strategy adjusts the segmented voltage threshold of Q(U) droop curve dynamically and adaptively according to the voltage of grid-connected point and the power direction of adjacent downstream line. And then the reactive power reference of DG inverter can be got through modified Q(U) control strategy. The reactive power of inverter is controlled to trace the reference value. The proposed control strategy can not only control the local voltage of grid-connected point but also help to maintain voltage within qualified range considering the terminal voltage of distribution feeder and the reactive support for adjacent downstream DG. The scheme using the proposed strategy is compared with the scheme without the reactive support of DG inverter and the scheme using the Q(U) control strategy with constant segmented voltage threshold. The simulation results suggest that the proposed method has a significant improvement on solving the problem of out-of-limit voltage, restraining voltage variation and improving voltage quality.