Title :
Research on soft regulation strategy of VSC-HVDC systems
Author :
Wang, Song ; Li, Gengyin ; Zhou, Ming ; Zhang, Zhe
Author_Institution :
Key Lab. of Power Syst. Protection & Dynamic Security Monitoring & Control under Minist. of Educ., North China Electr. Power Univ., Beijing, China
Abstract :
Based on power electronic converting current devices which can be controlled quickly, VSC-HVDC system can regulate active power, reactive power, DC voltage, and line voltage flexibly. Different regulation strategies have different influences on the power system stability. A worse regulation strategiy may lead to sharp fluctuation of electrical measurements and longer regulation time, which is harmful for the system stability. It is worse when faults happen during the regulation. The traditional regulation strategy is that the reference value of regulation is set to the goal value directly, sometimes the change is very serious like the reversal of power flow, and the electrical measurements may have sharp fluctuation during the regulation. Different from the traditional regulation strategy, a new regulation strategy, called soft regulation strategy, was presented in the paper, which can minish the fluctuation of electrical measurements and shorten the regulation time. The soft regulation strategy is helpful for the system stability and the device security. The soft protection strategy for serious impact from AC faults is also presented, by which the fault terminal is softly closed and the non-fault terminal works right as before, while the DC voltage can be kept, which increases the efficiency of VSC-HVDC system and makes preparation for restoration. Simulations performed in PSCAD/EMTDC verify the proposed regulation strategy.
Keywords :
HVDC power transmission; power system stability; AC faults; DC voltage; PSCAD/EMTDC; VSC-HVDC systems; device security; electrical measurements; line voltage; power electronic converting current devices; power flow reversal; power system stability; reactive power; soft protection strategy; soft regulation strategy; Faults; VSC-HVDC; protection; soft regulation; voltage source converter (VSC);
Conference_Titel :
Power and Energy Society General Meeting, 2010 IEEE
Conference_Location :
Minneapolis, MN
Print_ISBN :
978-1-4244-6549-1
Electronic_ISBN :
1944-9925
DOI :
10.1109/PES.2010.5589443