Title :
Study on Control Strategies to Improve the Stability of Multi-Infeed HVDC Systems Applying VSC-HVDC
Author :
Zhao, Chengyong ; Sun, Ying
Author_Institution :
Key Lab. of Power Syst. Protection & Dynamic Security Monitoring & Control under Minist. of Educ., North China Electr. Power Univ., Baoding
Abstract :
Against the stability of the multi-infeed HVDC (MIDC) transmission system, voltage source converter based HVDC (VSC-HVDC) is applied to MIDC systems. The new systems can reduce probability of commutation failure and improve the stability of the MIDC systems. A physical model of a multi-infeed HVDC and VSC-HVDC system is developed, and its mathematical model is analyzed. The rectangular coordinate form of VSC´s power transmission equations is deduced through coordinate conversion. Based on the inverse system method for multivariable nonlinear control, the nonlinear controllers of the multi-infeed HVDC and VSC-HVDC system are designed. Simulation results by PSCAD/EMTDC show that the designed nonlinear controllers improve effectively the voltage stability of the multi-infeed HVDC and VSC-HVDC system under small or large disturbances, such as short circuit fault, reduce the probability of commutation failure in the inverter of HVDC systems and increase the operation reliability of HVDC systems
Keywords :
HVDC power convertors; HVDC power transmission; invertors; multivariable control systems; nonlinear control systems; power system stability; power transmission control; power transmission faults; power transmission reliability; HVDC inverter; HVDC system reliability; MIDC system; PSCAD-EMTDC simulation; VSC-HVDC; inverse system method; multiinfeed HVDC transmission stability; multivariable nonlinear control; system disturbances; voltage source converter; Control systems; Converters; HVDC transmission; Mathematical model; Nonlinear control systems; Power conversion; Power system modeling; Power transmission; Stability; Voltage; HVDC; VSC-HVDC; commutation failure; inverse system method; multi-infeed HVDC Transmission system;
Conference_Titel :
Electrical and Computer Engineering, 2006. CCECE '06. Canadian Conference on
Conference_Location :
Ottawa, Ont.
Print_ISBN :
1-4244-0038-4
Electronic_ISBN :
1-4244-0038-4
DOI :
10.1109/CCECE.2006.277629
