Abstract
Subsynchronous resonance (SSR) can bring significant negative effects on the grid system like stability, security, and even generator shaft damage. This work presents a new method of using a doubly‐fed induction machine (DFIM) based system of variable speed pumped storage plant (VSPS) to mitigate SSR in the power system with high penetration of wind generation. The mitigation is reached based on the principle of balanced shaft mechanical input power and electromagnetic power. The fundamental concepts and phenomena of SSR with wind farm are discussed in brief in this work. For the sake of analysis and verification of performance of the proposed system, the network model including wind farm, VSPS, HVDC, and synchronous machine is built based on Ningxia grid for the SSR study using PSCAD platform. The result shows that VSPS brings significant effect to dampen the SSR in the power system with high penetration of wind generation.
Highlights
Subsynchronous resonance (SSR) in a power system is an electromechanical instability occurrence when the interaction exists between the torsional modes of generator sha s and e ect of series-compensated transmission line running with less than the nominal grid frequency [1]. e studies have con rmed that the wind farms constructed with doubly-fed induction generator (DFIG) and connected to series capacitor compensated transmission lines are quite vulnerable to subsynchronous interaction (SSI) and cause the escalation of SSR in the power system
Electromagnetic power can be calculated by the power ow of doubly-fed induction machine (DFIM) terminal to the grid, and controlled by the converters connected to the DFIM
By regulating injecting or absorbing active power of DFIM according to the generator speed deviation, the balance of the sha power will be maintained smooth; variable speed pumped storage plant (VSPS) can provide damping for SSR and suppress transient torque ampli cation e ect
Summary
Subsynchronous resonance (SSR) in a power system is an electromechanical instability occurrence when the interaction exists between the torsional modes of generator sha s and e ect of series-compensated transmission line running with less than the nominal grid frequency [1]. e studies have con rmed that the wind farms constructed with doubly-fed induction generator (DFIG) and connected to series capacitor compensated transmission lines are quite vulnerable to subsynchronous interaction (SSI) and cause the escalation of SSR in the power system. E studies have con rmed that the wind farms constructed with doubly-fed induction generator (DFIG) and connected to series capacitor compensated transmission lines are quite vulnerable to subsynchronous interaction (SSI) and cause the escalation of SSR in the power system. To mitigate SSR, a new method of using a doubly-fed induction machine (DFIM) based system of variable speed pumped storage plant (VSPS) is proposed based on the principle of balanced sha mechanical input power and electromagnetic power. By regulating injecting or absorbing active power of DFIM according to the generator speed deviation, the balance of the sha power will be maintained smooth; VSPS can provide damping for SSR and suppress transient torque ampli cation e ect. To analyse SSR and validate the performance of the proposed system, the network model including wind farm, VSPS, HVDC, and synchronous machine is built based on Ningxia grid for the study of SSR using PSCAD platform
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