China is an important country in iron and steel industry.Power electronics converters are widely used.For the cold rolling mills of high speed,AC-DC-AC converters should be used.In the paper,the design and the control...China is an important country in iron and steel industry.Power electronics converters are widely used.For the cold rolling mills of high speed,AC-DC-AC converters should be used.In the paper,the design and the control system of the large power three-level AC - DC - AC converter with IGCTs is investigated,and a back-to-back large power three-level AC - DC - AC converter with IGCTs has been got. With a series experiments,the performance of the converter is examined.The experiment result indicates the converter reaches the design requirement and it shows excellent performance.The converter system has been put into use safely.It is estimated that the AC - DC - AC converter system will be used in the drive systems for rolling mills in the near future.展开更多
针对双向隔离型AC-DC矩阵变换器,文中提出一种软开关复合调制策略,其中,前级3-1矩阵式变换电路采用对称双线电压调制法,以提高电压传输比;后级全桥电路采用互补控制,简单易实现;前后级电路之间进行移相控制。通过协调安排前后级脉冲宽...针对双向隔离型AC-DC矩阵变换器,文中提出一种软开关复合调制策略,其中,前级3-1矩阵式变换电路采用对称双线电压调制法,以提高电压传输比;后级全桥电路采用互补控制,简单易实现;前后级电路之间进行移相控制。通过协调安排前后级脉冲宽度分布,使得矩阵变换器中的双向开关在采用简单的两步换流时,可保证全部开关器件实现零电压开关(zero voltage switching,ZVS)换流。仿真和实验结果表明,网侧电流三相平衡正弦,相电流谐波畸变率小于3%,功率因数接近于1,输出电压和电流为稳定直流,电压电流纹波小,变换器中的双向开关和普通开关器件均能实现ZVS换流。在宽负载范围(10%~100%)内效率均保持在94.5%以上,最高效率可达97.74%。因此,采用提出的调制策略可实现双向隔离型AC-DC矩阵变换器功率的稳定传输,在保证良好的输入输出性能的同时,实现了开关器件的零电压换流,具有高效率。展开更多
针对当前新的42V汽车供电系统发展的必然趋势,提出一种基于42V Power Net的车用双向AC-DC矩阵式变换器,代替了传统的PWM整流电路和DC-DC变换器。在新提出的结构中,不再需要大的直流母线电容。三相交流电通过矩阵式变换器的一级变换就可...针对当前新的42V汽车供电系统发展的必然趋势,提出一种基于42V Power Net的车用双向AC-DC矩阵式变换器,代替了传统的PWM整流电路和DC-DC变换器。在新提出的结构中,不再需要大的直流母线电容。三相交流电通过矩阵式变换器的一级变换就可以得到期望输出的42V直流电,能量传输密度比传统整流电路高。本文采用基于间接空间矢量调制的闭环控制策略,表明了其有效性,确保了输出电压的可调节性和在不同负载下高质量的输入电流。展开更多
In this paper, a new predictive control strategy for current source matrix converter (CSMC) is presented. Proposed predictive control strategy allows for creating output voltages with boost type voltage transfer ratio...In this paper, a new predictive control strategy for current source matrix converter (CSMC) is presented. Proposed predictive control strategy allows for creating output voltages with boost type voltage transfer ratio and desired frequency. The description of predictive control circuit of the CSMC is presented. Furthermore the simulation test results to confirm functionality of the proposed control strategy and converter properties under this strategy are shown.展开更多
文摘China is an important country in iron and steel industry.Power electronics converters are widely used.For the cold rolling mills of high speed,AC-DC-AC converters should be used.In the paper,the design and the control system of the large power three-level AC - DC - AC converter with IGCTs is investigated,and a back-to-back large power three-level AC - DC - AC converter with IGCTs has been got. With a series experiments,the performance of the converter is examined.The experiment result indicates the converter reaches the design requirement and it shows excellent performance.The converter system has been put into use safely.It is estimated that the AC - DC - AC converter system will be used in the drive systems for rolling mills in the near future.
文摘针对双向隔离型AC-DC矩阵变换器,文中提出一种软开关复合调制策略,其中,前级3-1矩阵式变换电路采用对称双线电压调制法,以提高电压传输比;后级全桥电路采用互补控制,简单易实现;前后级电路之间进行移相控制。通过协调安排前后级脉冲宽度分布,使得矩阵变换器中的双向开关在采用简单的两步换流时,可保证全部开关器件实现零电压开关(zero voltage switching,ZVS)换流。仿真和实验结果表明,网侧电流三相平衡正弦,相电流谐波畸变率小于3%,功率因数接近于1,输出电压和电流为稳定直流,电压电流纹波小,变换器中的双向开关和普通开关器件均能实现ZVS换流。在宽负载范围(10%~100%)内效率均保持在94.5%以上,最高效率可达97.74%。因此,采用提出的调制策略可实现双向隔离型AC-DC矩阵变换器功率的稳定传输,在保证良好的输入输出性能的同时,实现了开关器件的零电压换流,具有高效率。
文摘针对当前新的42V汽车供电系统发展的必然趋势,提出一种基于42V Power Net的车用双向AC-DC矩阵式变换器,代替了传统的PWM整流电路和DC-DC变换器。在新提出的结构中,不再需要大的直流母线电容。三相交流电通过矩阵式变换器的一级变换就可以得到期望输出的42V直流电,能量传输密度比传统整流电路高。本文采用基于间接空间矢量调制的闭环控制策略,表明了其有效性,确保了输出电压的可调节性和在不同负载下高质量的输入电流。
文摘In this paper, a new predictive control strategy for current source matrix converter (CSMC) is presented. Proposed predictive control strategy allows for creating output voltages with boost type voltage transfer ratio and desired frequency. The description of predictive control circuit of the CSMC is presented. Furthermore the simulation test results to confirm functionality of the proposed control strategy and converter properties under this strategy are shown.
