Abstract
At present, systems for wind power transmission by ultra-high voltage direct current (UHVDC) and ultra-high voltage alternating current (UHVAC) have been constructed and are operating in China. The installed capacity of the doubly fed induction generator (DFIG) and the rated power of the UHVDC in a system involving wind power transmission by the UHVDC/UHVAC (WIND-UHVDC/AC) are very large, and the active power recovery rates of the DFIG and UHVDC after a short-circuit fault is cleared will seriously affect the rotor angle stability of the sending-end system. Therefore, it is significant to analyze the active power recovery rates of the DFIG and UHVDC for the safe operation of the WIND-UHVDC/AC system. First, the influence of the active power of the DFIG and UHVDC on the electrical power of the synchronous generator (SG) in the sending-end system is deduced mathematically. Second, the impact of the active power recovery rates of the DFIG and UHVDC on the deceleration areas of the SG are analyzed, respectively, and the effects of the variation in the equivalent internal reactance of the SG on the leftward shift and downward shift of the electrical power curve are studied. Then, the mechanism of the interactive influence of the active power recovery rates of the DFIG and UHVDC on the rotor angle stability is further analyzed. Finally, the theoretical analysis is validated using a typical WIND-UHVDC/AC system and an actual WIND-UHVDC/AC system in China's Northwest Power Grid. The analysis in this paper provides a theoretical foundation and a reference for the stability control strategy for the WIND-UHVDC/AC systems.
Highlights
In recent years, wind power generation has been one of the most mature and promising renewable energy power generation technologies
The research in this paper extends the analysis of rotor angle stability and provides a theoretical foundation and a reference for a stability control strategy of WIND-Ultra-high voltage direct current (UHVDC)/AC systems
THE IMPACT OF THE ACTIVE POWER RECOVERY RATES OF THE doubly fed induction generator (DFIG) AND UHVDC ON THE ROTOR ANGLE STABILITY The electrical power of the synchronous generator (SG) in a single-ended power transmission system can be calculated as follows [13], [22]: Pe where Eq is the no-load electromotive force of the SG, U is the voltage of the receiving-end system, δ is the rotor angle difference between Eq and U, Z11 is the self-impedance of the SG, Z12 is the mutual impedance between the SG and the receiving-end system, and α11 and α12 are the complementary
Summary
Wind power generation has been one of the most mature and promising renewable energy power generation technologies. It is significant to research the impact of the active power recovery rates of the DFIG and UHVDC on the transient rotor angle stability of the sending-end system for the safe and stable operation of the WIND-UHVDC/AC system. THE IMPACT OF THE ACTIVE POWER RECOVERY RATES OF THE DFIG AND UHVDC ON THE ROTOR ANGLE STABILITY The electrical power of the SG in a single-ended power transmission system can be calculated as follows [13], [22]: Pe. where Eq is the no-load electromotive force of the SG, U is the voltage of the receiving-end system, δ is the rotor angle difference between Eq and U , Z11 is the self-impedance of the SG, Z12 is the mutual impedance between the SG and the receiving-end system, and α11 and α12 are the complementary. The impact of the increase in kDFIG on the electrical power of the SG and the rotor angle stability can be analysed from the two aspects of the self-impedance term and mutual impedance term
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