五相双级矩阵变换器调制策略的研究
发布时间：2018-10-29 13:13
【摘要】：近几十年来,电力电子变换器因其自身的优势,在交流传动系统中得到了广泛的应用。随着电力电子相关技术的快速发展,多相电机驱动系统为实现高压大功率的交流传输提供了新途径,而与其相配套的多相电力变换器也得到了广泛的应用与研究。双级矩阵式变换器是一种新型的交-交电力变换装置,在电力电子变换器的发展中具有很大的潜力。本课题以五相双级矩阵变换器的典型拓扑为研究对象,对其控制策略进行了研究,为多相矩阵变换器进一步的理论研究打下了基础。在五相双级矩阵变换器拓扑结构的基础上,对其空间矢量调制(Space Vector Pulse Width Modulation,SVPWM)策略进行了研究,推导了其占空比函数表达式。然后利用一个对称的三角载波信号,结合占空比函数推导了相应调制信号的通用表达式。最后通过逻辑运算,实现了基于SVPWM策略的载波脉宽调制(PWM)方法,该方法避免了SVPWM策略的扇区组合和查表的复杂性。为抑制五相双级矩阵变换器在工作时产生的共模电压,通过分析其共模电压的产生机理,提出了一种减小其共模电压的载波PWM方法。在SVPWM策略的基础上,通过对逆变级零矢量的合理选择与分配,避免了较大共模电压的产生。最后结合载波信号推导了相应调制信号的通用表达式,得到了各个功率开关的驱动信号。该方法不仅减小了其共模电压,同时也减少了换流次数。最后,利用Matlab/Simulink平台搭建了五相双级矩阵变换器的仿真模型,仿真结果表明了上述方法的可行性。
[Abstract]:In recent decades, power electronic converters have been widely used in AC drive systems because of their own advantages. With the rapid development of power electronics related technology, the multi-phase motor drive system provides a new way to realize high-voltage and high-power AC transmission, and the matching multi-phase power converter has been widely used and studied. Two-stage matrix converter is a new type of AC-AC power conversion device, which has great potential in the development of power electronic converter. In this paper, the typical topology of five-phase two-stage matrix converter is taken as the research object, and its control strategy is studied, which lays a foundation for the further theoretical research of the multi-phase matrix converter. Based on the topological structure of five-phase two-stage matrix converter, the space vector modulation (Space Vector Pulse Width Modulation,SVPWM) strategy is studied, and the duty cycle function expression is derived. Then a general expression of the corresponding modulation signal is derived by using a symmetric triangular carrier signal combined with the duty cycle function. Finally, a carrier pulse width modulation (PWM) method based on SVPWM strategy is implemented through logical operation, which avoids the sector combination of SVPWM policy and the complexity of table lookup. In order to suppress the common-mode voltage generated by the five-phase two-stage matrix converter, a carrier PWM method is proposed to reduce the common-mode voltage by analyzing the generation mechanism of the common-mode voltage. On the basis of SVPWM strategy, the generation of large common-mode voltage is avoided by reasonable selection and allocation of zero vector of inverter level. Finally, the general expression of the corresponding modulation signal is derived with the carrier signal, and the driving signals of each power switch are obtained. This method not only reduces the common-mode voltage, but also reduces the commutation times. Finally, the simulation model of the five-phase two-stage matrix converter is built on the Matlab/Simulink platform. The simulation results show that the proposed method is feasible.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46
[Abstract]:In recent decades, power electronic converters have been widely used in AC drive systems because of their own advantages. With the rapid development of power electronics related technology, the multi-phase motor drive system provides a new way to realize high-voltage and high-power AC transmission, and the matching multi-phase power converter has been widely used and studied. Two-stage matrix converter is a new type of AC-AC power conversion device, which has great potential in the development of power electronic converter. In this paper, the typical topology of five-phase two-stage matrix converter is taken as the research object, and its control strategy is studied, which lays a foundation for the further theoretical research of the multi-phase matrix converter. Based on the topological structure of five-phase two-stage matrix converter, the space vector modulation (Space Vector Pulse Width Modulation,SVPWM) strategy is studied, and the duty cycle function expression is derived. Then a general expression of the corresponding modulation signal is derived by using a symmetric triangular carrier signal combined with the duty cycle function. Finally, a carrier pulse width modulation (PWM) method based on SVPWM strategy is implemented through logical operation, which avoids the sector combination of SVPWM policy and the complexity of table lookup. In order to suppress the common-mode voltage generated by the five-phase two-stage matrix converter, a carrier PWM method is proposed to reduce the common-mode voltage by analyzing the generation mechanism of the common-mode voltage. On the basis of SVPWM strategy, the generation of large common-mode voltage is avoided by reasonable selection and allocation of zero vector of inverter level. Finally, the general expression of the corresponding modulation signal is derived with the carrier signal, and the driving signals of each power switch are obtained. This method not only reduces the common-mode voltage, but also reduces the commutation times. Finally, the simulation model of the five-phase two-stage matrix converter is built on the Matlab/Simulink platform. The simulation results show that the proposed method is feasible.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46
【参考文献】
相关期刊论文 前10条
1 潘月斗;郭凯;陈继义;徐杰;;基于状态反馈线性化的矩阵变换器非线性控制[J];电力自动化设备;2015年05期
2 蔡卓剑;赵荣祥;汪i裆，
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