In this paper the operation of a three level H-bridge converter as well as its parallel operations is analyzed and simulated on the computer. Based on the simulation results the operating behavior between (a) a thre...In this paper the operation of a three level H-bridge converter as well as its parallel operations is analyzed and simulated on the computer. Based on the simulation results the operating behavior between (a) a three level H-bridge neutral point clamped convener, (b) a three level back-to-back H-bridge neutral point clamped convener, (c) two three level H-bridge neutral point clamped converters parallel connected is being compared. From the simulation results it is obvious that in the first two cases the ripples, the distortion in primary and secondary winding currents, and the power factor are quite satisfactory and almost identical to each other. In the third case as compared with the first two, it is observed that current harmonics with higher amplitude appear in the primary winding of the transformer.展开更多
针对我国首个±1100 k V特高压直流工程(准东—皖南),研究了直流送受端接入系统方案。首先,对于直流送端系统,考虑直流再启动、闭锁等故障对电网的影响,采用直流安全稳定计算标准,从频率和电压稳定性角度研究送端换流站孤岛接入和...针对我国首个±1100 k V特高压直流工程(准东—皖南),研究了直流送受端接入系统方案。首先,对于直流送端系统,考虑直流再启动、闭锁等故障对电网的影响,采用直流安全稳定计算标准,从频率和电压稳定性角度研究送端换流站孤岛接入和联网接入2种方式的可行性。然后,对于直流受端系统,从提高多馈入短路比、抑制短路电流、平衡潮流分布3个层次,研究受端换流站单层接入500 k V、单层接入1000k V、分层接入1000 k V/500 k V这3种方式的可行性。最后,从受端换流站近区网架结构、接入通道选择等多角度研究并提出了换流站的系统接入网架方案。展开更多
根据锡盟±800 k V特高压换流站电气总平面布置设计要求,结合电气主接线、进出线条件和站区总体规划方案,考虑节约占地、布局紧凑合理、出线顺畅、与周围环境协调、减少拆迁赔偿、便于运行维护、控制楼朝向合理等方面,对交流500 k ...根据锡盟±800 k V特高压换流站电气总平面布置设计要求,结合电气主接线、进出线条件和站区总体规划方案,考虑节约占地、布局紧凑合理、出线顺畅、与周围环境协调、减少拆迁赔偿、便于运行维护、控制楼朝向合理等方面,对交流500 k V配电装置区域、交流滤波器区域、直流开关场区域、换流区域(阀厅、换流变压器及控制楼区域)、站前辅助功能区域的电气总平面布置进行了设计优化,确定最为合理的布置型式。展开更多
文摘In this paper the operation of a three level H-bridge converter as well as its parallel operations is analyzed and simulated on the computer. Based on the simulation results the operating behavior between (a) a three level H-bridge neutral point clamped convener, (b) a three level back-to-back H-bridge neutral point clamped convener, (c) two three level H-bridge neutral point clamped converters parallel connected is being compared. From the simulation results it is obvious that in the first two cases the ripples, the distortion in primary and secondary winding currents, and the power factor are quite satisfactory and almost identical to each other. In the third case as compared with the first two, it is observed that current harmonics with higher amplitude appear in the primary winding of the transformer.
文摘针对我国首个±1100 k V特高压直流工程(准东—皖南),研究了直流送受端接入系统方案。首先,对于直流送端系统,考虑直流再启动、闭锁等故障对电网的影响,采用直流安全稳定计算标准,从频率和电压稳定性角度研究送端换流站孤岛接入和联网接入2种方式的可行性。然后,对于直流受端系统,从提高多馈入短路比、抑制短路电流、平衡潮流分布3个层次,研究受端换流站单层接入500 k V、单层接入1000k V、分层接入1000 k V/500 k V这3种方式的可行性。最后,从受端换流站近区网架结构、接入通道选择等多角度研究并提出了换流站的系统接入网架方案。
文摘根据锡盟±800 k V特高压换流站电气总平面布置设计要求,结合电气主接线、进出线条件和站区总体规划方案,考虑节约占地、布局紧凑合理、出线顺畅、与周围环境协调、减少拆迁赔偿、便于运行维护、控制楼朝向合理等方面,对交流500 k V配电装置区域、交流滤波器区域、直流开关场区域、换流区域(阀厅、换流变压器及控制楼区域)、站前辅助功能区域的电气总平面布置进行了设计优化,确定最为合理的布置型式。