基于单相坐标变换的电压跟踪保持器的研究与设计

发布时间：2018-06-30 00:39

本文选题：电压跟踪保持器 + 双闭环控制　；参考：《东北大学》2014年硕士论文

【摘要】：随着信息科学技术的发展,人们更加注重电能质量的高低。由于大量非线性设备的使用,电网中存在大量的谐波污染,导致电压波动、频率变化,电能质量变差。因电能质量问题导致交流接触器脱扣带来的设备运行中断,给企业带来巨大的经济损失甚至人员伤亡。上述问题尽管可以通过使用不问断电源(UPS)予以解决,但由于UPS体积庞大以及价格高昂,为其在工业企业中的应用带来不便。国内许多工业企业受电能质量差导致交流接触器脱扣的困扰,但市面上专门用于解决上述问题且性能可靠的产品稀少,现急需加强创新和科技成果的转化,开发出一款具有自主知识产权的能应对上述情况的产品。本文针对电压波动、欠压和中断等导致交流接触器脱扣的问题,做了如下研究：(1)分析工业企业对电网电压跟踪保持器的功能要求以及技术要求,确定系统整体结构和控制策略。(2)建立电压跟踪保持器的主逆变电路的连续状态模型与离散数字模型,理论推导设计的基础原理,证明全桥PWM逆变可产生等效正弦波。(3)分析单相PWM逆变器的单闭环和双闭环控制策略,针对传统的双闭环控制在交流系统中无法完全发挥PID的快速跟踪能力问题,重点研究了d-q坐标变换在单相中的实现方法,并将其应用在双闭环控制中,得到具有直流跟踪特性的改进性双闭环控制策略。通过搭建Matlab实验仿真模型对改进的双闭环控制策略进行仿真验证。(4)根据系统整体结构框图,对各部分硬件电路进行详细设计,在设计中为保证系统的可靠,采用了多种防干扰设计方法,并对设计好的硬件电路进行了细致调试。(5)按照功能要求,编写了各部分软件程序,包括电压状态判断、A/D采样、相位跟踪、保护程序等。结合硬件电路对软件进行调试,通过实物验证了控制的可行性以及硬件的可靠性。本文研究的改进型双闭环控制算法能很好的解决上述问题。通过分析电压状态,触发电网电压跟踪保持器逆变输出正弦电压,保持交流接触器持续吸合,克服短时电能质量差的问题,保障工业过程中设备的连续稳定运行。
[Abstract]:With the development of information science and technology, people pay more attention to power quality. Due to the use of a large number of nonlinear equipment, there are a large number of harmonic pollution in the power network, resulting in voltage fluctuations, frequency changes and power quality deterioration. Because of the power quality problem, the equipment operation is interrupted by AC contactor tripping, which brings huge economic loss and even casualties to the enterprise. Although these problems can be solved by using uninterrupted power supply (UPS), the application of UPS in industrial enterprises is inconvenient because of its large size and high price. Many industrial enterprises in China are troubled by AC contactor tripping due to poor power quality. However, there are few products in the market that are specially used to solve the above problems and have reliable performance. It is urgent to strengthen the transformation of innovation and scientific and technological achievements. To develop a product with independent intellectual property rights that can deal with the above situation. In order to solve the problems of voltage fluctuation, undervoltage and interruption which lead to AC contactor tripping, this paper has done the following research: (1) analyze the functional requirements and technical requirements of voltage tracker in power system. The overall structure and control strategy of the system are determined. (2) the continuous state model and discrete digital model of the main inverter circuit of the voltage tracker are established. It is proved that full-bridge PWM inverter can produce equivalent sine wave. (3) the single-loop and double-closed-loop control strategies of single-phase PWM inverter are analyzed. In order to solve the problem that the traditional double-closed loop control can not give full play to the fast tracking ability of pid in AC system, The realization method of d-q coordinate transformation in single phase is studied and applied to double closed loop control. An improved double closed loop control strategy with DC tracking characteristics is obtained. The improved double-closed loop control strategy is simulated and verified by building Matlab simulation model. (4) according to the overall structure of the system, the hardware circuits are designed in detail, in order to ensure the reliability of the system in the design. Various anti-interference design methods are adopted, and the designed hardware circuits are debugged carefully. (5) according to the functional requirements, various software programs are written, including voltage state judgment / A / D sampling, phase tracking, protection program and so on. The feasibility of the control and the reliability of the hardware are verified by debugging the software with the hardware circuit. The improved double-loop control algorithm studied in this paper can solve the above problems well. By analyzing the voltage state, the inverter output sinusoidal voltage is triggered, the AC contactor is continuously sucked, the problem of short time power quality is overcome, and the continuous and stable operation of the equipment in the industrial process is ensured.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM572.2

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