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4,000원
원문정보
초록
영어
Currently, the development of industry makes needs larger electric supply. Providers must consider the efficiency about losses and reliability of the system. In this case, DC power system can save electrical energy; long-distance transmission line losses. Relevance to switch technology with a voltage-source converter (VSC) in AC-DC conversion system have been researched. But, protection device of DC-link against fault current is still needed to study much. VSC DC power system is vulnerable to DC-cable short-circuit and ground faults, because DC-link has a huge size of capacitor filter which releases extremely large current during DC faults. Furthermore, DC has a fatal flaw that current zero crossing is nonexistence. To interrupt the DC, several methods which make a zero crossing is used; parallel connecting self-excited series LC circuit with main switch, LC circuit with power electronic device called hybrid DC circuit breaker. Meanwhile, self-excited oscillator needs a huge size capacitor that produces big oscillation current which makes zero crossing. This capacitor has a quite effective on the price of DCCB. In this paper, hybrid self-excited type superconducting DCCB which are using AC circuit breaker system is studied by simulation tool PSCAD/EMTDC.
목차
Abstract 1. INTRODUCTION 2. MATHMEMATICAL INVESTIGATION OF COMPONENTS 2.1. Resistance of Arc 2.2. Derivation of Self-Excited DCCB 2.3. Resistance of Superconducting Element 3. STURCUTRE AND OPERATING PRINCIPLE 3.1. Structure and Role 3.2. Operating Principle 4. SIMULATION AND RESULTS 4.1. Setup and Simulation 5. CONCLUSION ACKNOWLEDGMENT REFERENCES
키워드
hybrid self-excited type superconducting DC circuit breaker(DCCB)zero crossingvoltage sourced converter (VSC)
저자
S. J. Choi [ Soongsil University, Seoul, Korea ]
S. H. Lim [ Soongsil University, Seoul, Korea ]
Corresponding Author