도시철도 직류 전력량 계측을 위한 직류용 스마트미터링 시스템 개발 및 성능시험

초록

DC urban railway power system consists of DC power network and AC power network. The DC powernetwork supplies electric power to railway vehicles and the AC power network supplies electric power to station electricequipment. Recently, because of power consumption reduction and peak load shaving, intelligent measurement ofregenerative energy and renewable energy adapted on DC urban railway is required. For this reason, DC smart meteringsystem for DC power network shall be developed. Therefore, in this paper, DC voltage sensor, current sensor, and DCsmart meter were developed and evaluated by performance test. DC voltage sensor was developed for measuringstandard voltage range of DC urban railway, and DC current sensor was developed as hall effect split core type in orderto install in existing system. DC smart meter possesses function of general intelligent electric power meter, such asmeasuring electricity and wireless communication etc. And, DC voltage sensor showed average 0.17% of measuring errorfor 2,000V/50mA, and current sensor showed average 0.21% of measuring error for ±2,000V/±4V in performance test. Also DC smart meter showed maximum 0.92% of measuring error for output of voltage sensor and current sensor. Insimilar environment for real DC power network, measuring error rate was under 0.5%. In conclusion, accuracy of DCsmart metering system was confirmed by performance test, and more detailed performance will be verified by furtherreal operation DC urban railway line test.

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