Abstract
To mitigate subsynchronous control interactions (SSCIs) in doubly fed induction generator (DFIG) based wind farm, which is connected to power grid via series compensated transmission line, a static synchronous compensator (STATCOM) based supplementary damping controller (SDC) is proposed. The admittance model of STATCOM with SDC is derived and its equivalent admittance is analyzed. Equivalent admittance reveals that SDC can increase the admittance of STATCOM at the designed frequency. Thus, oscillation energy could be dissipated by STATCOM and the damping of power system is improved. The influence of SDC parameters on the damping of SSCI is analyzed, which includes phase shift angle and proportional gain. Besides, the optimal selection of the input signal of SDC and location of STATCOM are studied to achieve the best mitigation performance. Finally, the proposed scheme is validated by theoretical analysis and simulations with PSCAD/EMTDC. It is proved that the proposed SDC can suppress SSCI effectively and increase the stability margin of the power system.
| Translated title of the contribution | STATCOM Based Supplementary Damping Mitigation Strategy for Subsynchronous Control Interaction in Wind Farms |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 49-55 |
| Number of pages | 7 |
| Journal | Dianli Xitong Zidonghua/Automation of Electric Power Systems |
| Volume | 43 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - 10 Aug 2019 |