Abstract
The rapid growth in penetration levels of powerelectronics-interfaced renewable power generation into grids have been reducing system kinetic inertia, which results in degraded frequency stability and oscillation damping. In an attempt to address this challenge, this paper proposes a control scheme which realizes coordinated flexible damping mechanism (CFDM) with inertia emulation capability for modular multilevel converter based multi-terminal dc (MMC-MTDC) transmission systems. The proposed CFDM scheme allows the MMC-MTDC system to autonomously provide emulated inertial response with flexible damping effect to ac systems in a similar fashion of synchronous generator, without the need for communication. To ensure the precision of the total provided damping power, the power losses of the converter stations and MTDC networks are also compensated in the algorithm. The CFDM controller parameters are optimized by the small signal stability analysis. The effectiveness of the proposed CFDM scheme is demonstrated in a power system model simulated in MATLAB/Simulink which consists of a three-terminal MMC-MTDC transmission system and three asynchronous ac girds. It is verified that the proposed CFDM scheme can effectively minimize grid frequency deviation and damp angular oscillation in grid events of load changes and faults.
| Original language | English |
|---|---|
| Pages (from-to) | 7329 - 7342 |
| Number of pages | 8 |
| Journal | IEEE Journal of Emerging and Selected Topics in Power Electronics |
| Volume | 9 |
| Issue number | 6 |
| Early online date | 21 Sept 2020 |
| DOIs | |
| Publication status | Published - Dec 2021 |
Keywords
- damping
- voltage control
- power electronics
- topology