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STUDY OF VOLTAGE AND HARMONIC STABILITY OF CAPACITOR COMMUTATED CONVERTERS APPLIED TO HVDC/BTB
Hiroo Konishi,Tatsuo Yamada,Mas atoshi Sanpei,Takayoshi Sano 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
Voltage and harmonic stability characteristics of capacitor commutated converters applied to a BTB (back to back) system (CCC-BTB) are analyzed and compared to characteristics ofaBTB system composed of conventional line commutated converters (LCC-BTB). About 1 6 times larger safe operating regions can be obtained for the CCC-BTB system compared to the latter. The CCC-BTB system results in no harmonic instability problem as it has no shunt reactive compensators in the station and the adj oining AC system generates no low anti-resonance points.<br/>
Standing Waves in Sea South Island Sea Caused by the Typhoon 9119
Yoshinobu Tsuji,Tatsuo Konishi 한국해안해양공학회 1994 학술강연회 발표논문초록집 Vol.1 No.1
The 19th typhoon of 1991 caused remarkable storm surges of more than 3 meters with great innundations to the coasts in the western part of the Seto Inland Sea. We assumed the wind in the typhoon area by the model of Miyazaki's and made numerical simulations for several cases with changing drag coefficient, and we obtained the best fit result for the case of C_d=3.5 ×10 ^(-3). We also found out that after passing over the typhoon, proper oscillations trapped in Seto Inland Sea were left for more than ten hours by which some coastal towns suffered from the sea water inundation. We analytically obtained the proper oscillations by solving an eight-value problem, and identified the observed modes to the theoretically obtained modes. It was clarified that induced oscillation modes were such ones that no water exchange was accompanied between the inland sea and the open ocean.