三相交流能馈式电子负载的研究与设计

发布时间：2018-06-21 14:09

本文选题：“背靠背”结构 + PWM整流器　；参考：《中原工学院》2017年硕士论文

【摘要】：随着现代科技的不断进步,某些电气设备成为合格成品之前需要进行必不可少的带不同特性的负载测试以显示其带载后的特性是否达到要求。而针对于传统的测试负载所存在的缺陷,本文所研究的电子负载是一种将电力电子技术和智能功率开关管以及DSP控制芯片相结合的电力电子装置。利用PWM整流器可以实现四象限运行的特性,将整流侧灵活的控制在阻容性、阻感性和纯阻性之间,实现实时、无级、大范围的调整。对于节能方面的优化,相比于传统的测试负载而言,由于本次的研究设计采用的是AC-DC-AC的“背靠背”结构。在电子负载的后端将直流侧的电能通过逆变的方式回馈到电网侧,真正实现了能量的二次利用。同时大大降低了因电流的热效应而产生的发热问题。本文首先从拓扑结构进行了分析,从电压型和电流型的对比中选择了电压型拓扑结构作为本文的研究对象。为了便于理解,将PWM整流器的模型进行等效简化,结合向量法和Kirchhoff电压定律对其四象限运行的工作原理进行分析验证。对于控制策略的选择和应用的前提条件是建立其数学模型和进行前馈解耦算法所需要的有功、无功电流,有功、无功电压等信息,而SPLL能够正常锁相和数学模型的建立以及前馈解耦算法所需要的信息得到的前提都是以坐标变换作为支撑,所以坐标变换作为第三章、第四章的逻辑起点在文中其推导过程做了较为详细的分析。在第五章中对本次设计的硬件选取以及软件设计的整体思想进行介绍。在第六章中利用仿真平台对整体的设计方案进行了验证,在控制功率因数角的子系统中,提出了一种利用有功、无功电流幅值关系与三角函数关系相结合的方法,搭建的仿真能够灵活、准确的控制功率因数且谐波较小。通过运行结果体现了整体设计的可行性。
[Abstract]:With the development of modern science and technology, some electrical equipment need to carry out load tests with different characteristics to show whether the characteristics after loading meet the requirements before becoming a qualified finished product. Aiming at the defects of the traditional test load, the electronic load studied in this paper is a kind of power electronic device which combines power electronics technology with intelligent power switch and DSP control chip. The PWM rectifier can be used to realize the four-quadrant operation, and the rectifier side can be flexibly controlled between resistive and capacitive, inductive and pure resistive to realize real-time, stepless and wide range adjustment. For the optimization of energy saving, compared with the traditional test load, the AC-DC-AC "back to back" structure is adopted in this research design. At the back end of the electronic load, the DC side energy is fed back to the power grid side by the way of inverter, and the secondary utilization of energy is realized. At the same time, the heat problem caused by the thermal effect of current is greatly reduced. In this paper, the topology structure is analyzed firstly, and the voltage type topology is chosen as the object of this paper from the comparison of voltage and current modes. In order to be easy to understand, the PWM rectifier model is simplified and the working principle of the four-quadrant operation is analyzed and verified by using vector method and Kirchhoff's voltage law. The precondition of selecting and applying control strategy is to establish the mathematical model and the information of active power, reactive current, active power, reactive power and voltage needed for the feedforward decoupling algorithm. The SPLL can establish the normal phase-locked mathematical model and the information needed by the feedforward decoupling algorithm is based on coordinate transformation as the support, so coordinate transformation as the third chapter, The logical starting point of chapter 4 is analyzed in detail in this paper. In the fifth chapter, the hardware selection and the whole idea of software design are introduced. In the sixth chapter, the simulation platform is used to verify the whole design scheme. In the subsystem of controlling the power factor angle, a method of combining the active power, reactive current amplitude relationship and trigonometric function relationship is proposed. The simulation can be flexible, accurate control of power factor and less harmonic. The feasibility of the whole design is reflected by the running results.
【学位授予单位】：中原工学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM461

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