大容量インバ-タ制御システムの高信頼化方式
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概要
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Inverter systems are now being applied as the power source in large scale equipment. In the present paper, a highly reliable configuration of a large capacity inverter control system is proposed.In order to make the inverter system highly reliable, enhanced reliability of its control system is a necessity. This control system consists of triple redundant controllers and signal selection circuits which select the most reasonable control signals. The number of signal selection circuits corresponds to that of switching elements in an inverter. Each signal selection circuit consists of a majority voting gate in which any stuck faults can be excluded by eliminating the DC-power supply. Since the control system controls the switching elements, the control signals should be synchronized. Then, each controller has a synchronous circuit. Synchronizing signals are produced by voting trigger signals from the controllers themselves. By applying the above synchronizing method, even if one synchronous circuit fails, the controllers connected to the other synchronous circuits are able to generate normal control signals.Therefore the reliability of the inverter system is enhanced, and mean time between failures (MTBF) on the system is three times longer than that on an inverter system consisting of conventional triple redundant controllers.
- 社団法人 電気学会の論文