Abstract
The well-developed unified power flow controller (UPFC) has demonstrated its capability in providing voltage support and improving power system stability. The objective of this paper is to demonstrate the capability of the UPFC in mitigating oscillations in a wind farm integrated power system by employing eigenvalue analysis and dynamic time-domain simulation approaches. For this purpose, a power oscillation damping controller (PODC) of the UPFC is designed for damping oscillations caused by disturbances in a given interconnected power system, including the change in tie-line power, the changes of wind power outputs, and others. Simulations are carried out for two sample power systems, i.e., a four-machine system and an eight-machine system, for demonstration. Numerous eigenvalue analysis and dynamic time-domain simulation results confirm that the UPFC equipped with the designed PODC can effectively suppress oscillations of power systems under various disturbance scenarios.
Highlights
This scheme is referred to the industry model and is used generator, and a unified power flow controller (UPFC) integrated together
Compared with the results presented in Reference [22], similar conclusions can be drawn that the relative power angle low frequency oscillations can bethe damped out byofequipping increased and tended to be stable for a long time without installation the power oscillation damping controller (PODC);a PODC
The d-q axis equivalent model was employed for doubly-fed induction generators (DFIG), and the damping controller for the shunt converter of the UPFC was designed
Summary
Renewable energy generation has developed quickly around the globe. The wind power generation installed capacity is currently ranked the second highest in renewable energy technology, after hydro [1]. By integrating large-scale wind farms, which are mainly doubly-fed induction generators (DFIG) [2], into a power system concerned, wind energy is expected to supply. In spite of the benefits of wind power generation, if not controlled properly, a high-level penetration of wind power generation could have negative impacts on power system dynamic stability, especially the oscillation damping characteristics. M+N-1 electro-mechanical oscillation modes and numerous operating scenarios. Electro-mechanical oscillatory modes and damping may become worse if the power system operating condition changes, especially with the increasing penetration of wind power integration. In a wind farm integrated power system, it is important to analyze the oscillation damping characteristics
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