节点文献
家用电器的功率因数校正技术研究及应用
【作者】 杨柳；
【导师】 喻寿益；
【作者基本信息】 中南大学 ， 控制科学与工程， 2012， 硕士
【摘要】 随着家用电器(洗衣机、空调、冰箱等)在城市和农村日益普及,我国家用电器保有量非常巨大,家用空调机就达到了2亿多台。家用电器功率因数不高,普遍在0.7左右,减少了低压供电网的容量利用率,增加电能传输无功功率的损耗。采用功率因数校正技术(PFC)可以提高功率因数,实现节能降耗,随着运算速度快、价格低的控制芯片的出现,加快了PFC技术向智能化、数字化方向的发展。论文采用ARM控制芯片对家用电器的功率因数校正策略进行研究与设计。永磁同步电机(PMSM)具有效率高、结构简单、运行可靠等特点,其驱动控制系统在家用电器领域得到普遍运用,论文针对采用PMSM驱动控制系统的家用电器特点,设计开发了电压电流双闭环Boost电路PFC控制系统。通过分析Boost电路工作原理,建立电感电流连续状态下的电压平衡方程式,设计了控制回路结构,提出了一种给定占空比的电压和电流反馈的PFC控制策略。利用MATLAB/Simulink对带PFC的PMSM驱动控制系统进行仿真。仿真结果表明,与平均电流法相比,在保证控制精度和输出电压稳定的条件下,加快了响应速度。在输入电压和负载波动条件下,PFC控制系统仍具有良好的稳定性和很高的功率因数。构建了STM32F103X(ARM)为主控制器的实验平台,详细分析了控制系统的硬件组成和软件设计原理,对给定占空比的双环PFC控制策略进行实现。结果表明,所提出的控制策略在输入电压波动±20%范围内和不同工作频率条件下,均能维持输出电压稳定和较高功率因数。与平均电流法相比,降低了电压过零点处的电流畸变,功率因数从0.98提高到0.995以上,表明该控制策略对提高家用电器功率因数有良好的应用价值。
【Abstract】 As the growing popularity of household appliances (refrigerators, air conditioning, and washing machine) in city and countryside, household appliances inventory of our country is huge. Household air conditioner reach200million.The power factor of household appliances is lower, generally only about0.7. So it reduced the capacity utilization rate of low voltage supply network, increased reactive power loss in power transmission.Using the power factor correction (PFC) can increase power factor, save energy and reduce the cost. Along with the fast calculation speed and cheap control chip to appear, accelerate the PFC technology to the intelligent and digitalization.The control strategy proposed in the paper is achieved base on control chip.Permanent magnet synchronous motor (PMSM) has the advantages of high efficiency, simple structure, reliable running etc., the driving control system has become more and more widely used in household electrical appliances. Aim at the characteristic of PMSM drive control system in household appliances, this paper design and exploit of double loop control circuit of Boost PFC control system. make a detail analysis of modeling process and the design of control loop circuit, establish voltage balance equation under a continuous current state, presents a given duty cycle of the voltage and current feedback control strategy of PFC. Use MATLAB/Simulink to simulate PMSM drive control system with PFC. The simulation results show that, Compared with the average current method, On the premise of guaranteeing the precision of control and maintaining stablity of the output voltage, can improve the response speed of the system. In the fluctuation situation of input voltage, motor torque and speed, the PFC control system still has good stability and high power factor.Make a detailed analysis of the control system; dissect the working principle and the way of realization of the main modules. Experiments were carried out on experimental platform, which STM32F103X (ARM) is chosen as the main controller, for verification. The results show that, under a fluctuation range of20%of the input voltage and different working frequency condition, the boost circuit PFC control system with double closed loop control strategy can maintain a stable output voltage, Ripple voltage is less than2%, Input current is of good sinusoidal waveform, Compare with traditional average current method, reduced the current distortion at the crossing point of voltage. The power factor is increased from0.98to more than0.995, it shows that the control strategy has good effect of power factor correction, has good application value to improve the power factor of the household appliances.