【作者】 殷志柱；

【导师】 杨煜普； 董祖毅；

【作者基本信息】 上海交通大学 ， 控制工程， 2009， 硕士

【摘要】 随着电力电子技术的迅速发展,大量新型电力电子设备在电力传输、制造加工、轨道交通等行业获得了广泛应用,同时也给电网带来了严重的谐波污染,引起了一系列用电质量问题,严重地危害了电网的安全可靠运行。此外,谐波的存在限制了功率因数的进一步提高,造成了电网容量的巨大浪费。基于电力电子技术、数字信号处理技术和先进控制理论的电力有源滤波器可对谐波进行动态精确补偿,被视为解决谐波污染的最有效和最具潜力的装置。本文首先分析了目前工业用户两种主要谐波源,整流负载和交流电弧炉负载,说明了谐波产生机理。对三相整流谐波源在稳态负载情况下进行了分析和研究,给出了输入电流谐波THD跟电路参数关系的解析式。其次对电弧炉负载产生谐波的机理、特点以及阻抗特性进行了分析。目前的电力有源滤波器一般采用双闭环反馈控制,其中的PI参数的设计一直是影响系统运行的可靠性、精确性的关键技术。本文首先对经典的利用传递函数波特图来获取PI参数的设计方法进行了分析和仿真,在电流环和电压环解耦控制情况下,分别设计各自的PI参数。然后着重研究基于强化学习算法的智能搜索PI参数的方法,并与前一种PI算法进行了对比。仿真结果表明,电力有源滤波器模型利用该智能搜索算法,可以自动实现参数优化,减小系统的电压超调和电流冲击,从而提高了系统的可靠性,减少了开关器件容量的浪费。有源滤波器是一种以变流器为基础的硬件平台和双闭环反馈控制系统的集成,无论是软件算法的选择还是硬件参数设计都对系统性能具有重要影响。所以本文不仅给出了主要硬件参数的计算方法和工程选型标准,对于以TMS320LF2812DSP为核心的控制系统硬件设计也做了比较详细的说明,研究分析了本项目研究中所采用的软件算法流程和实现各个功能的软件算法。在上述研究工作的基础上设计开发了380V容量40kVA的三单相并联有源滤波器样机,并在样机实验中检验其谐波补偿性能。更多还原

【Abstract】 With the development of power electronics technology, high power electronics have been widely used in the field of power transmission and distribution, material manufacture, subway traffic and so on. A lot of harmonic pollution has been brought to power systems and results in a series of power quality and reliability problems. At the same time, the harmonics reduced the power factor deeply, which means low efficiency and enormous waste of capacity of power system. Based on the development of power electronics technology, digital system process and advanced control theories, active power filter can compensate harmonic in real time. It is considered that active power filter is the best technique and has a great potential for harmonic suppression.At the beginning of this thesis, rectifying circuit and arc furnace have been introduced as two kinds of major industry harmonics source; Based on the theoretical analysis and simulation, the relationship between the THD of input current and the parameter of rectifying circuit is given. Then the Mechanism characteristic and Harmonic characteristics of arc furnace are shown.Double-closed loop control is generally adopted in active power filters, PI parameters of which effect reliability and precision of harmonics compensation of active power filter. Firstly a classic method of getting parameters of PI based on transfer function and bode diagram is discussed in simulation. In the simulation PI parameters of current loop and voltage loop are calculated independently in the case of decoupled state. Focusing on the getting parameters of PI based on reinforcement learning algorithmic, arithmetic and simulation is studied. The simulation result showed that PI parameters of active power filter are optimized automatically with less current impact and voltage impact. System reliability is improved and device capacity of waste is reduced, when this method is adopted.Active power filter combines the hardware based on convertor with the arithmetic of double-closed loop feedback. In the thesis, not only the arithmetic of major hardware of convertor is presented, but also the design of hardware is designed based on TMS320F2812. Besides the algorithms and control process of the project is showed in detail.Based on the research, 40kVA experimental specimen of active power filter is installed and the function of harmonic compensation is validated.更多还原