-
公开(公告)号：US20170176222A1
公开(公告)日：2017-06-22
申请号：US15452713
申请日：2017-03-07
CPC分类号： H02K19/26 , G01D5/3473 , H02P6/16 , H02P6/182 , H02P2203/05 , H02P2203/09
摘要： A position of a rotor of a synchronous generator is measured under no load and under load. An angle of difference between where a terminal voltage crosses a zero-point and the marked position of the rotor under no load is calculated. A load angle is of the synchronous generator based the no load angle of difference and the load angle of difference.
-
2.发明申请公开(公告)号：US20170141696A1
公开(公告)日：2017-05-18
申请号：US15420234
申请日：2017-01-31
申请人： Rohollah Abdollahi
发明人： Rohollah Abdollahi
摘要： A 72-pulse clean power AC-DC converter, based on a T autotransformer configuration with reduced kilovolt ampere rating and a THD of lower than 3% is presented. The T-Connected autotransformer based 36-pulse converter is obtained via two paralleled 18-pulse AC-DC converters each of them consisting of a 9-phase (9-leg) diode bridge rectifier. To achieve a 72 pulse output, a pulse doubling circuit is applied which, in one embodiment, is a tapped inter-phase transformer. A T-connected autotransformer is utilized to supply the rectifiers.
-
3.发明申请T-Connected Autotransformer-Based 40-Pulse AC-DC Converter for Power Quality Improvement 审中-公开基于T型连接的自耦变压器的40脉冲AC-DC转换器，用于电能质量改进公开(公告)号：US20140218982A1
公开(公告)日：2014-08-07
申请号：US13761146
申请日：2013-02-06
申请人： Rohollah Abdollahi
发明人： Rohollah Abdollahi
IPC分类号： H02M7/06
CPC分类号： H02M7/08 , H02M1/4208 , Y02B70/126
摘要： Design of a T-connected autotransformer based 20-pulse ac-dc converter is presented in this invention. The 20-pulse topology is obtained via two paralleled ten-pulse ac-dc converters each of them consisting of a five-phase (five-leg) diode bridge rectifier. For independent operation of paralleled diode-bridge rectifiers, a zero sequence blocking transformer (ZSBT) is designed and implemented. Connection of a tapped inter-phase transformer (IPT) at the output of ZSBT results in doubling the number of output voltage pulses to 40. Experimental results are obtained using the designed and constructed laboratory prototype of the proposed converter to validate the design procedure and the simulation results under varying loads. The VA rating of the magnetic in the proposed topology are calculated to confirm the savings in space, volume, weight, and cost of the proposed configuration.
摘要翻译： 本发明提出了一种基于T型自耦变压器的20脉冲交流 - 直流转换器的设计。 20脉冲拓扑通过两个并联的十脉冲交流 - 直流转换器获得，每个转换器由五相（五脚）二极管桥式整流器组成。 对于并联二极管桥整流器的独立运行，设计并实现了零序阻塞变压器（ZSBT）。 在ZSBT的输出端连接抽头的相间变压器（IPT）会使输出电压脉冲数增加一倍。实验结果使用设计和构建的转换器实验室原型获得，以验证设计程序和 在不同负载下的模拟结果。 计算出所提出的拓扑结构中磁性VA的额定值，以确定拟议配置的空间，体积，重量和成本的节省。
-
公开(公告)号：US10720854B2
公开(公告)日：2020-07-21
申请号：US15224697
申请日：2016-08-01
申请人： Rohollah Abdollahi
发明人： Rohollah Abdollahi
摘要： A novel 72-pulse AC-DC converter based on a 36-pulse converter is designed and implemented in this invention. Combining the outputs of two parallel 18-pulse diode bridges, consisting of nine legs of diode rectifiers, results in a 36-pulse topology. A zero sequence blocking transformer (ZSBT) is designed and applied to the proposed scheme guarantying the independent operation of the two bridges. To achieve a 72-pulse output, a pulse doubling circuit is applied which is inherently a tapped inter-phase transformer. A polygon-connected autotransformer platform is designed and added to the converter, making the proposed scheme suitable for retrofit applications. The proposed solution is a tradeoff among the pulse number, the transformer platform, the complexity of the scheme and the cost. The proposed scheme has an optimized configuration in this regard. The simulation results show that the proposed scheme improves the power quality indices.
-
公开(公告)号：US20200052574A1
公开(公告)日：2020-02-13
申请号：US15224697
申请日：2016-08-01
申请人： Rohollah Abdollahi
发明人： Rohollah Abdollahi
摘要： A novel 72-pulse AC-DC converter based on a 36-pulse converter is designed and implemented in this invention. Combining the outputs of two parallel 18-pulse diode bridges, consisting of nine legs of diode rectifiers, results in a 36-pulse topology. A zero sequence blocking transformer (ZSBT) is designed and applied to the proposed scheme guarantying the independent operation of the two bridges. To achieve a 72-pulse output, a pulse doubling circuit is applied which is inherently a tapped inter-phase transformer. A polygon-connected autotransformer platform is designed and added to the converter, making the proposed scheme suitable for retrofit applications. The proposed solution is a tradeoff among the pulse number, the transformer platform, the complexity of the scheme and the cost. The proposed scheme has an optimized configuration in this regard. The simulation results show that the proposed scheme improves the power quality indices.
-
6.发明授权T-connected autotransformer-based 40-pulse AC-DC converter for power quality improvement 有权基于T型自耦变压器的40脉冲AC-DC转换器，可提高电能质量公开(公告)号：US08982595B2
公开(公告)日：2015-03-17
申请号：US13761146
申请日：2013-02-06
申请人： Rohollah Abdollahi
发明人： Rohollah Abdollahi
CPC分类号： H02M7/08 , H02M1/4208 , Y02B70/126
摘要： Design of a T-connected autotransformer based 20-pulse ac-dc converter is presented in this invention. The 20-pulse topology is obtained via two paralleled ten-pulse ac-dc converters each of them consisting of a five-phase (five-leg) diode bridge rectifier. For independent operation of paralleled diode-bridge rectifiers, a zero sequence blocking transformer (ZSBT) is designed and implemented. Connection of a tapped inter-phase transformer (IPT) at the output of ZSBT results in doubling the number of output voltage pulses to 40. Experimental results are obtained using the designed and constructed laboratory prototype of the proposed converter to validate the design procedure and the simulation results under varying loads. The VA rating of the magnetic in the proposed topology are calculated to confirm the savings in space, volume, weight, and cost of the proposed configuration.
摘要翻译： 本发明提出了一种基于T型自耦变压器的20脉冲交流 - 直流转换器的设计。 20脉冲拓扑通过两个并联的十脉冲交流 - 直流转换器获得，每个转换器由五相（五脚）二极管桥式整流器组成。 对于并联二极管桥整流器的独立运行，设计并实现了零序阻塞变压器（ZSBT）。 在ZSBT的输出端连接抽头的相间变压器（IPT）会使输出电压脉冲数增加一倍。实验结果使用设计和构建的转换器实验室原型获得，以验证设计程序和 在不同负载下的模拟结果。 计算出所提出的拓扑结构中磁性VA的额定值，以确定拟议配置的空间，体积，重量和成本的节省。
-
-
-
-
-
搜索结果
6 条记录 (耗时 0.016 秒)
