摘要
随着电力电子设备的广泛应用,电力谐波及无功污染现象越来越严重。给工业生产和社会生活带来不便。消除谐波并提高功率因数,已经成为电力电子学界和全社会关注的热门问题。功率因数校正技术是减少用电设备对电网造成的谐波污染,提高用电效率的一项有力措施。用电设备的功率因数是衡量其性能的一项重要指标,而提高功率因数的最根本途径就是采用有源功率因数校正技术。
针对有源功率因数校正系统中控制对象非线性和时变的特点,本文研究了模糊控制算法在有源功率因数校正系统中的应用。文中针对1000W的BOOST变换器设计了一种模糊PI控制器,并把它应用到APFC系统中,通过仿真表明这种模糊PI控制器比一般的PI控制器有更好的控制效果。
随着数字控制技术的不断发展,越来越多的控制策略通过数字控制得以实现。数字控制的特有优点:简化硬件电路,克服了模拟电路中参数温度漂移的问题,控制灵活且易实现先进控制等,使得所设计的电源产品不仅性能可靠,且易于大批量生产,从而降低了开发周期。数字化控制电源已成为当今开关电源产品设计的潮流。
因此,本文提出用FPGA来设计APFC开关电源的模糊控制器,以提高开关频率和控制精度。通过计算仿真表明,引入模糊控制设计的APFC系统能明显提高系统的功率因数,响应快,稳态精度高。
最后,以EP1K30QC208芯片为核心,设计了硬件电路。
With the comprehensive application of power electronics equipments, the problem of mains harmonic and pollution becomes more and more serious, which causes inconvenience of the industry production and society life.Eliminating harmonics and increasing power factor has been becoming a hot topic both in power electronics and in the society as well.Power-Factor-Correction (PFC) is a state-of-art technique for reducing harmonic distortion and increasing the power supply network efficiency. Power-Factor (PF) is one of the quality indices of electric equipment, and the Active-Power-Factor-Correction (APFC) technique is the fundamental way to improve it.
In accordance with the nonlinear and time-varying characteristics of the APFC system, this theme researches the application of Fuzzy control in the APFC system. According to BOOST circuit witch power is 1000W, this theme designs a fuzzy PI controller. And then, the fuzzy PI controller is applied the system of APFC. After simulation, the results show that this controller is better than PID controller.
With the development of the digital technique, more and more control algorithms can be implemented in power electronics by the digital control. The merits of digital control: simple hardware, no temperature drift, flexible control and easy to realize advanced arithmetic etc, make digital control technique to be used in power supply manufacture to let it more credible and easier to realize in batches with lower costs. In the current it is popular to use digital control in switching power supply design.
Therefore, for raise switching frequency and control accuracy, this paper presents a method of designing fuzzy controller of APFC switching power supply using FPGA. An APFC system is designed, after computation and simulation, the results show that this design can raise obviously the power factor of system, and this design has the many advantages, for example, simple algorithm, rapid response, and high accuracy.
Finally, the hardware circuit is designed with a core of EP1K30QC208 slug.
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