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RISS 인기검색어
- 검색키워드
- 저자 : Ruhr, Marc von der (검색결과 2 건)
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HIGH POWER TRACTION CONVERTERS
A Steimel,Ruhr Univ.Bochum 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
In railway traction the three-phase drive system with inverter-fed Induction motors has asserted itself, with 1100 locomotives and even more suburban cars running. While the first vehicles were equipped with forced-commutated thyristor Inverters and open-loop slip-frequency control, the recent standard are self-turn-off power devices as GTOs, and highly advanced field-oriented or direct control of torque and flux.<br/> The new unsymmetrical snubber circuit for high-power GTOs reduced inverter losses to 50%, weight to some 25% within the last 20 years.For a.c. overhead supply the self-commutated line-side converter 1s now standard; re-grouping 1t as step-up choppers for operation under d.c. line opens new economic solutions for multi-system vehicles. Modern cooling technologies are explained, recent examples for European very high power applications given.<br/> With the increasing capability of the Inverters the demands on the control system grew, too; best suited for traction Inverters seems Direct Self Control using the restricted switching frequency best, yet allowing time-optimal torque control.<br/>
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Optimal Currency Basket Pegs for Developing and Emerging Economies
Daniels, Joseph P.,Toumanoff, Peter G.,Ruhr, Marc von der 세종대학교 국제경제연구소 2001 Journal of Economic Integration Vol.16 No.1
The exchange rate arrangement represents an important policy choice for emerging and transitional economies as they strive to become stable and market-driven. A wide variety of arrangements have emerged, ranging from currency boards, basket-currency pegs and single-currency pegs to floating rates. Recently the IMF has recommended that, if the exchange value of a currency is to be pegged, it is better to peg to a basket of currencies rather than a single currency. Nonetheless, there has been little theoretical research on the management and optimal design of basket-peg arrangements. In this paper we extend the small-country macroeconomic model of Turnovsky to show that an optimally designed basket-peg arrangement can minimize the variance in domestic consumer prices as well as the variance of foreign reserves. The model highlights the importance of the money and bond markets and, therefore, the importance of various interest rate channels. Additionally we show what a trade-weighted currency basket is not only suboptimal, it is at odds with increasing capital market integration. Further our solutions illustrate that the optimal weights will evolve as the domestic economy integrates with the global market for goods and services, and financial instruments.
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