The Experts below are selected from a list of 7074 Experts worldwide ranked by ideXlab platform
Ji Qingzhao - One of the best experts on this subject based on the ideXlab platform.
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low voltage crossing testing system for low voltage auxiliary frequency converter of thermal power plant
2015Co-Authors: Xu Zaide, Xia Yonghong, Fan Ruixiang, Ji QingzhaoAbstract:A low-voltage crossing testing system for a low-voltage auxiliary frequency converter of a thermal power plant comprises the components of a voltage sag generator (2), a power electronic load (4), a low-voltage auxiliary frequency converter (1) and testing equipment. In the low-voltage crossing testing system, the input end of the voltage sag generator is connected with a 380V plant-used bus (6) through a Switch Q2 and a Switch Q1; the output end of the voltage sag generator is connected with the low-voltage auxiliary frequency converter through a Switch Q3; the output end of the low-voltage auxiliary frequency converter is connected with the input end of the power electronic load through a Switch Q4; the output end of the power electronic load is connected with the 380V plant-used bus through a Switch Q5; a digital storage oscilloscope (3) acquires AC signals at the input end and the output end of the low-voltage auxiliary frequency converter through a current transformer; and a coal feeder control system (5) is connected with the 220V power supply through a Switch Q6. The low-voltage crossing testing system for the low-voltage auxiliary frequency converter of the thermal power plant can simulate the actual working condition of the low-voltage auxiliary frequency converter and improves the low-voltage crossing capability of the low-frequency auxiliary frequency converter.
Xu Zaide - One of the best experts on this subject based on the ideXlab platform.
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low voltage crossing testing system for low voltage auxiliary frequency converter of thermal power plant
2015Co-Authors: Xu Zaide, Xia Yonghong, Fan Ruixiang, Ji QingzhaoAbstract:A low-voltage crossing testing system for a low-voltage auxiliary frequency converter of a thermal power plant comprises the components of a voltage sag generator (2), a power electronic load (4), a low-voltage auxiliary frequency converter (1) and testing equipment. In the low-voltage crossing testing system, the input end of the voltage sag generator is connected with a 380V plant-used bus (6) through a Switch Q2 and a Switch Q1; the output end of the voltage sag generator is connected with the low-voltage auxiliary frequency converter through a Switch Q3; the output end of the low-voltage auxiliary frequency converter is connected with the input end of the power electronic load through a Switch Q4; the output end of the power electronic load is connected with the 380V plant-used bus through a Switch Q5; a digital storage oscilloscope (3) acquires AC signals at the input end and the output end of the low-voltage auxiliary frequency converter through a current transformer; and a coal feeder control system (5) is connected with the 220V power supply through a Switch Q6. The low-voltage crossing testing system for the low-voltage auxiliary frequency converter of the thermal power plant can simulate the actual working condition of the low-voltage auxiliary frequency converter and improves the low-voltage crossing capability of the low-frequency auxiliary frequency converter.
Xia Yonghong - One of the best experts on this subject based on the ideXlab platform.
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low voltage crossing testing system for low voltage auxiliary frequency converter of thermal power plant
2015Co-Authors: Xu Zaide, Xia Yonghong, Fan Ruixiang, Ji QingzhaoAbstract:A low-voltage crossing testing system for a low-voltage auxiliary frequency converter of a thermal power plant comprises the components of a voltage sag generator (2), a power electronic load (4), a low-voltage auxiliary frequency converter (1) and testing equipment. In the low-voltage crossing testing system, the input end of the voltage sag generator is connected with a 380V plant-used bus (6) through a Switch Q2 and a Switch Q1; the output end of the voltage sag generator is connected with the low-voltage auxiliary frequency converter through a Switch Q3; the output end of the low-voltage auxiliary frequency converter is connected with the input end of the power electronic load through a Switch Q4; the output end of the power electronic load is connected with the 380V plant-used bus through a Switch Q5; a digital storage oscilloscope (3) acquires AC signals at the input end and the output end of the low-voltage auxiliary frequency converter through a current transformer; and a coal feeder control system (5) is connected with the 220V power supply through a Switch Q6. The low-voltage crossing testing system for the low-voltage auxiliary frequency converter of the thermal power plant can simulate the actual working condition of the low-voltage auxiliary frequency converter and improves the low-voltage crossing capability of the low-frequency auxiliary frequency converter.
Fan Ruixiang - One of the best experts on this subject based on the ideXlab platform.
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low voltage crossing testing system for low voltage auxiliary frequency converter of thermal power plant
2015Co-Authors: Xu Zaide, Xia Yonghong, Fan Ruixiang, Ji QingzhaoAbstract:A low-voltage crossing testing system for a low-voltage auxiliary frequency converter of a thermal power plant comprises the components of a voltage sag generator (2), a power electronic load (4), a low-voltage auxiliary frequency converter (1) and testing equipment. In the low-voltage crossing testing system, the input end of the voltage sag generator is connected with a 380V plant-used bus (6) through a Switch Q2 and a Switch Q1; the output end of the voltage sag generator is connected with the low-voltage auxiliary frequency converter through a Switch Q3; the output end of the low-voltage auxiliary frequency converter is connected with the input end of the power electronic load through a Switch Q4; the output end of the power electronic load is connected with the 380V plant-used bus through a Switch Q5; a digital storage oscilloscope (3) acquires AC signals at the input end and the output end of the low-voltage auxiliary frequency converter through a current transformer; and a coal feeder control system (5) is connected with the 220V power supply through a Switch Q6. The low-voltage crossing testing system for the low-voltage auxiliary frequency converter of the thermal power plant can simulate the actual working condition of the low-voltage auxiliary frequency converter and improves the low-voltage crossing capability of the low-frequency auxiliary frequency converter.
Gun-woo Moon - One of the best experts on this subject based on the ideXlab platform.
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A high power density and power factor cascade buck-boost PFC under expanded high line voltage
2016 IEEE Transportation Electrification Conference and Expo Asia-Pacific (ITEC Asia-Pacific), 2016Co-Authors: Byunggu Kang, Chong-eun Kim, Jae-il Baek, Dong-kwan Kim, Gun-woo MoonAbstract:In this paper, a control method to achieve a high power density and improve the power factor (PF) in the light load conditions for a voltage range of 180∼305Vac using a cascade buck-boost PFC converter is proposed. Recently, the requirement of a 277Vac for an input voltage rather than a 240Vac has been increased in a power distribution stage. The output voltage of the PFC stage of the conventional boost PFC converter, which is widely used for the PFC stage, is increased to 450V under a voltage range of 180∼305Vac compared to the output voltage (400V) under a voltage range of 180∼264Vac, i.e, nominal 240Vac. Therefore, the volume of the output capacitor is also increased compared to a existing voltage range of 180∼264Vac, which reduces the power density of the PFC stage. Moreover, the conventional boost PFC converter has a poor PF in the light load conditions due to the phase leading input current caused by the input capacitor. To overcome these problems, this paper proposes the control scheme using a cascade buck-boost PFC converter in order to achieve the conventional output voltage (400V) under a voltage range of 180∼305Vac. Therefore, a smaller output capacitor can be used in the proposed method and achieve a high power density. Also, with proper control of an additional Switch (Q1), the phase leading input current can be relieved. The concept and principles are explained and the performance of the proposed method is verified by the prototype converter with 800W conventional output (450V, 1.78A) and proposed output ( 400V, 2.00A).
