有源中点钳位型五电平逆变器调制策略及其调速系统研究
发布时间：2019-04-11 14:35
【摘要】：多电平逆变器已被广泛应用于大功率矿用提升机、风机、压缩机、传送带等场合，随着工矿企业对电机驱动设备高功率因数、低开关损耗、低谐波含量的要求不断提高，各种多电平逆变器拓扑应运而生。有源中点钳位型（ANPC）五电平逆变器因其具有无需移相变压器和钳位二极管，每相只有一个悬浮电容，直流母线只有一个中点电位等优点，越来越受到学术界和工业界的关注。 在分析了ANPC五电平逆变器工作原理的基础上，首先对ANPC五电平逆变器的SHEPWM技术进行了深入研究。采用新颖的全局最优粒子群优化算法，通过调试种群大小、惯性权重、加速度系数等参数，高效搜索出了开关角非线性超越方程组的解，并针对不同的调制度范围分别设计了不同的逆变器输出相电压波形。采用电压滞环控制策略平衡悬浮电容电压，并通过调节悬浮电容电压滞环阈值大小，影响中点电位的自平衡能力，以实现对中点电位的平衡控制。仿真结果表明，该滞环控制策略需要针对不同的调制度调试出合适的阈值大小，在保证中点电位平衡的前提下尽量降低开关频率，工程应用中具有一定的局限性。 为此，，进一步研究了ANPC五电平逆变器的SVPWM技术。首先引入物理意义明确的ja-jb-jc虚坐标系，将逆变器输出的零序、非零序电压分量分开控制，简化了矢量序列的选择过程和矢量作用时间的计算。然后分析了ANPC五电平逆变器在512个三相开关组合下形成的10种直流母线电容充放电回路，并分别建立了能够形成各回路的所有空间电压矢量表，进而通过查表掌握125个空间电压矢量对中点电位的影响特性。最后在此基础上提出了基于SVPWM技术的中点电位平衡控制策略，并通过仿真在不同调制度下验证了该策略的有效性。 为进一步验证ANPC五电平逆变器的调速特性，分析了永磁同步电机的矢量控制策略，搭建了基于isd=0控制策略的矢量控制系统仿真模型。仿真结果表明：在SVPWM技术调制下，永磁同步电机输出转矩脉动小，动态响应速度快，本文提出的中点电位平衡控制策略能够在动态条件下有效平衡ANPC五电平逆变器的中点电位。 最后，介绍了实验样机硬件平台，着重给出了基于“DSP+双FPGA”的数字控制系统设计方案；并设计了软件程序，对本文研究的几种调制策略进行了实验验证。
[Abstract]:Multi-level inverter has been widely used in high-power mine hoist, fan, compressor, conveyor belt and so on, with the requirement of high power factor, low switching loss and low harmonic content of motor-driven equipment in industrial and mining enterprises, various multi-level inverter topologies have emerged. An active mid-point clamp type (ANPC) five-level inverter has the advantages of no need of phase-shifting transformer and clamping diode, only one floating capacitor for each phase, and only one midpoint potential of the DC bus, and is more and more concerned by the academic and industry. Based on the analysis of the working principle of the ANPC five-level inverter, the SHEPWM technology of the ANPC five-level inverter is studied. In this paper, a novel global optimal particle swarm optimization algorithm is used to efficiently search the solution of the nonlinear transcendental equations of the switching angle by adjusting the parameters such as the population size, the inertia weight, the acceleration coefficient and the like, and the different output phase voltage waves of the inverter are respectively designed for different modulation system ranges. The voltage hysteresis control strategy is adopted to balance the floating capacitor voltage, and the self-balancing capacity of the mid-point potential is affected by adjusting the voltage hysteresis threshold of the suspension capacitor, so as to realize the balance control on the midpoint potential. The simulation results show that the control strategy of the hysteresis loop needs to adjust the appropriate threshold size for different modulation systems, and reduce the switching frequency as much as possible under the premise of ensuring the balance of the mid-point potential. The SVPW of the ANPC five-level inverter is further studied for this purpose. the method comprises the following steps of: firstly, introducing a ja-jb-jc virtual coordinate system with a definite physical meaning, separating the zero sequence and the non-zero sequence voltage component output by the inverter, and simplifying the selection process and the vector action time of the vector sequence; The charge and discharge loop of 10 DC bus lines formed by the five-level inverter of ANPC at 512 three-phase switches is then analyzed, and all the space voltage vector tables of each circuit can be formed, and the shadow of the midpoint potential of the 125 space voltage vectors can be obtained by looking up the table. In this paper, the mid-point potential balance control strategy based on SVPWM technology is put forward, and the strategy is verified by simulation under different modulation systems. In order to further verify the speed regulation of the ANPC five-level inverter, the vector control strategy of the permanent magnet synchronous motor is analyzed, and the vector control system based on the isd = 0 control strategy is set up. The simulation results show that, under the modulation of SVPWM, the output torque of the permanent magnet synchronous motor is small and the dynamic response speed is fast. The neutral point potential balance control strategy proposed in this paper can balance the ANPC five-level inverter effectively under the dynamic condition. At last, the hardware platform of the experimental prototype is introduced, and the design scheme of the digital control system based on the "DSP + Dual FPGA" is given. The software program is also designed.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464
本文编号：2456489
[Abstract]:Multi-level inverter has been widely used in high-power mine hoist, fan, compressor, conveyor belt and so on, with the requirement of high power factor, low switching loss and low harmonic content of motor-driven equipment in industrial and mining enterprises, various multi-level inverter topologies have emerged. An active mid-point clamp type (ANPC) five-level inverter has the advantages of no need of phase-shifting transformer and clamping diode, only one floating capacitor for each phase, and only one midpoint potential of the DC bus, and is more and more concerned by the academic and industry. Based on the analysis of the working principle of the ANPC five-level inverter, the SHEPWM technology of the ANPC five-level inverter is studied. In this paper, a novel global optimal particle swarm optimization algorithm is used to efficiently search the solution of the nonlinear transcendental equations of the switching angle by adjusting the parameters such as the population size, the inertia weight, the acceleration coefficient and the like, and the different output phase voltage waves of the inverter are respectively designed for different modulation system ranges. The voltage hysteresis control strategy is adopted to balance the floating capacitor voltage, and the self-balancing capacity of the mid-point potential is affected by adjusting the voltage hysteresis threshold of the suspension capacitor, so as to realize the balance control on the midpoint potential. The simulation results show that the control strategy of the hysteresis loop needs to adjust the appropriate threshold size for different modulation systems, and reduce the switching frequency as much as possible under the premise of ensuring the balance of the mid-point potential. The SVPW of the ANPC five-level inverter is further studied for this purpose. the method comprises the following steps of: firstly, introducing a ja-jb-jc virtual coordinate system with a definite physical meaning, separating the zero sequence and the non-zero sequence voltage component output by the inverter, and simplifying the selection process and the vector action time of the vector sequence; The charge and discharge loop of 10 DC bus lines formed by the five-level inverter of ANPC at 512 three-phase switches is then analyzed, and all the space voltage vector tables of each circuit can be formed, and the shadow of the midpoint potential of the 125 space voltage vectors can be obtained by looking up the table. In this paper, the mid-point potential balance control strategy based on SVPWM technology is put forward, and the strategy is verified by simulation under different modulation systems. In order to further verify the speed regulation of the ANPC five-level inverter, the vector control strategy of the permanent magnet synchronous motor is analyzed, and the vector control system based on the isd = 0 control strategy is set up. The simulation results show that, under the modulation of SVPWM, the output torque of the permanent magnet synchronous motor is small and the dynamic response speed is fast. The neutral point potential balance control strategy proposed in this paper can balance the ANPC five-level inverter effectively under the dynamic condition. At last, the hardware platform of the experimental prototype is introduced, and the design scheme of the digital control system based on the "DSP + Dual FPGA" is given. The software program is also designed.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464
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