【作者】 李光；

【导师】 王直杰；

【作者基本信息】 东华大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 随着高压电动机对调速性能、节能增效要求的增加,高压变频器得到了日益增长的需求,对其结构原理和变频调速算法的研究是当前电气传动领域的热点问题。本文对10KV单元串联式高压变频器进行了全面的研究与设计:分析了其电路原理和控制方式;给出了模拟量控制电路的实现和10KV整机评价试验结果;并对高压变频器的无速度传感器矢量控制策略进行了设计。本文首先分析了10KV高压变频器的主电路拓扑结构和功率单元电路的设计原理,基于功率单元的串联式结构和多电平移相式PWM技术,使变频器的输出电压具有多级阶梯电平和高开关频率的特性,输出波形良好。接着,分析了控制电路的构成和功能。重点是模拟量控制电路的设计和实现,运用Multisim对电路进行了仿真,运用ProtelDXP对电路进行设计并且完成PCB制板,最终成功运用于10KV高压变频器。对10KV单元串联式高压变频器的整机评价试验进行了详细介绍,通过在各种工况下的测试,给出了功率单元和整机的各项试验数据和波形,评价结果证实10KV高压变频器的整机特性和功率单元内各器件满足设计要求。最后对无速度传感器矢量控制策略在10KV高压变频器上的应用进行了研究。基于转子磁链定向矢量控制理论,设计了磁链闭环无速度传感器矢量控制系统,并运用MATLAB/Simulink对系统进行了仿真研究。电流调节器、磁链调节器和速度调节器以期望的响应为基准的设计方式,使实际值能很好的跟随指令值。扰动观测器解决了动态降速的问题,使系统动态抗扰性能提升。对比分析了两种改进电压模型磁链观测器,仿真结果表明励磁电流补偿模型相比磁链参考值补偿模型具有更好的动态性能,观测磁链值更加准确。在转速估算方面,动态转速估计器结合速度滤波和超前校正补偿的设计,使系统在高速和低速状态下都能取得良好的转速转矩特性。此外,对模型参考自适应(MRAS)方法进行了一些仿真研究。两种转速估算方法的仿真结果证明了其可行性。更多还原

【Abstract】 The need in high-voltage motor to increase the performance of speed regulation and energy efficiency leads to the ever-increasing use of the high-voltage inverter. Therefore, the research of the structure and variable frequency speed regulation algorithm in high-voltage inverter has been a key problem in the field of electrical drive. This thesis carries out deep research and design on 10KV cell-series high-voltage inverter, including theories of the circuits and control method, the implementation of analog control circuit, evaluation experiments of 10KV high-voltage inverter, and the speed sensorless vector control strategy on high-voltage inverter.Firstly, the topologic structure of main circuit and the theory of cell circuit in 10KV high-voltage inverter are analyzed. Based on the cell-series structure and multilevel phase-shifting PWM technology, the output voltage of the inverter pocesses the feature of multilevel wave and high switch-frequency. Afterwards, the structure and function of control circuit are analyzed. We focus on the design and implementation of analog control circuit. We carry out simulations of these circuits on Multisim and apply Protel DXP to design the circuits and PCB. Analog control circuit has applied successfully in 10KV high-voltage inverter.The evaluation experiments of 10KV cell-series high-voltage inverter are presented in details. Through the tests with different conditions, we have given the data and waves of the cell and the whole machine. The experiment results show that the performance of the whole machine and the devices in cell are qualified for the design requirements.Finally, we apply speed sensorless vector control strategy in 10KV high-voltage inverter. Based on rotor flux orientation vector control theory, we design the flux close-loop speed sensorless vector control system and apply MATLAB/Simulink to complete simulations of it. By using the design method of setting basis of the expected response, current regulator, flux regulator and speed regulator make the actual output follow the instruction input with good performance. Disturbance observer solves the problem of dynamic speed falling and promotes the performance of dynamic anti-disturbance in system. Two modified voltage model flux observers are compared and analyzed, and the simulation results show that the model with compensation of magnetizing current has better dynamic performance and ability of observation than the model with compensation of flux reference. On the aspect of speed regulation, dynamic speed estimator combines the filter with advanced correcting compensation. The speed and torque have good performance both at high speeds and at low speeds. Furthermore, we study on MRAS and carry out some simulations. The simulation results show that these two speed estimation algorithms are feasible.更多还原