【作者】 程艳；

【导师】 章玮；

【作者基本信息】 浙江大学 ， 电机与电器， 2012， 硕士

【摘要】 随着环境危机的日益严重,可再生能源已成为现代社会发展的需求,在寻求新能源的同时,节能减排也显得至关重要。能量回馈型网侧变换器在节能中发挥了举足轻重的作用。随着电力电子设备容量的增大,它对电网的影响也日趋显著。因此,电力系统对能量回馈系统的运行提出了苛刻的要求,即能量回馈系统回馈的电能质量必须良好。目前国内能量回馈型变换器市场正在需要具有自主知识产权和核心技术,并且价格合理的实际产品。本文针对最基础、最实用的能量回馈型变换器进行较为系统和深入的理论和应用研究,为其实用化奠定较好的基础。本文研究的控制策略研究内容主要涉及以下两个方面：一是基于能量回馈系统回馈到电网的电流谐波控制策略,二是寻求抑制回馈能量时直流母线电压泵升,保证直流母线电压稳定的方法。在运用预测电流控制进行谐波控制时,文中首先基于预测电流原理,研究了静止坐标系和旋转坐标系预测电流控制策略,阐述了各自的机理和实现目标。文中总结了当前主流的预测电流控制算法,提出了一种改进的旋转坐标系下预测电流控制算法。该算法继承了传统预测电流控制算法低电流谐波的特点,又克服了传统预测电流控制算法存在电流稳态误差的缺点,实现了良好的动静态特性。为了保证系统稳定运行,对于直流侧电压闭环控制进行了建模和分析,增加了直流侧电流的采样,补偿负载突变时的电流。为了克服并网电流过冲问题,采用了一套直流母线电压软启动方案。在前几章设计和分析的基础上,建立了一台基于DSP控制的能量回馈系统实验样机,并进行了相关的实验研究。此外,在原有硬件平台上,针对实际应用问题,完善系统的保护,主要包括过流保护、过欠压保护和相序错误等。本文还设计了系统主程序软件,并解决了实际系统运行中易受到的抗干扰问题。通过研究和实验证明,本文所研究、提出的能量回馈系统控制策略、主电路设计和实际应用对策等关键技术的一些理论、设计和方法是行之有效的,能够指导能量回馈型网侧变换器的实际研发和生产。更多还原

【Abstract】 With the worsening environmental crisis, renewable energy has become the demand of the development of modern society, while seeking new energy sources, energy conservation is crucial. Energy feedback grid-side converter has played a important role in energy conservation. With the increasing capacity of the power electronic devices, its impact on the power grid are becoming increasingly significant. Therefore, the energy feedback power system must meet the demanding requirements, that the feedback current quality of energy feedback systems must be good. With independent intellectual property rights, core technologies, and reasonably priced products are developed for the domestic energy feedback converter market. This paper do some systematic and deep research on the most fundamental and applied the energy feedback converter including related theoretical and application issues.The following two aspects of control strategies were mainly discussed in this paper. On the one hand, back to the grid current harmonics control strategy is sought based on energy feedback system. On the other hand, the method is sought to ensure the DC bus voltage stable when system feedback energy to the grid.Predictive current control strategy was introduced to control the current harmonics. Firstly, based on the principle of the predictive current control strategy, the mechanism and different targets of the predictive current control strategy in the stationary coordinate frame and the rotating coordinate frame was studied and outlined. This paper summarizes the mainstream current predictive current control algorithm and provide an improved predictive current control algorithm in the rotating coordinate frame. The algorithm inherits the characteristics of low current harmonics, also overcome the shortcomings of the traditional predictive current control algorithm, which include the current steady-state error, and finally achieve a good static and dynamic characteristics.The closed-loop control of DC voltage was modeled and analyzed in order to ensure the stable operation of the system by adding the sampling of the DC side current to compensation current error when the load mutation. Moreover a DC bus voltage soft-start program was developed to overcome the grid current overshoot.An experimental prototype of a DSP-based control of the energy feedback system was established and experimentally studied based on the design and analysis in the previous chapters. In addition, the protection measures was designed to improve of the system, including over-current protection, over-voltage protection and phase sequence error, based on the original hardware platform for the practical application. The main system software was accurately designed and solver the interference problem of the actual operation of the system.Through the research and experimental results, it can be verified that the key technologies for energy feedback system described in this paper, including control strategy, the main circuit design and the practical application method is viable and effective, which can guide the actual R & D and production of the energy feedback converter.更多还原