并网变流器实时仿真技术研究

发布时间：2018-01-05 13:23

本文关键词：并网变流器实时仿真技术研究　出处：《北京交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：新能源及分布式发电技术的发展,促使越来越多的变流器接入电网当中,改变了传统电网的结构,并带来一系列的问题,同时电网的一些异常情况也给并网变流器带来巨大影响。由于受到实验条件的限制,很多关于变流器与电网相互影响的研究都停留于软件仿真研究阶段,这样不仅效率低,而且得出的研究结果与实际往往有偏差。本文搭建了一套以dSPACE和RTDS为核心的实时仿真平台,在该平台上通过实时仿真的方法,研究分布式发电系统接入配电网后,并网变流器与配电网之间的相互影响。主要工作如下： 1、阐述了实时仿真及半实物仿真的特点及优势,对实时仿真平台的硬件配置及使用方法做了较为详细的介绍,并提出了基于dSPACE和RTDS实时仿真建模的一般原则。在分析光伏、锂电池、变流器和配电网原理的基础上,设计并建立了并网变流器实时仿真平台,给出了系统各组成部分模型的实时建模方法,实现了能量源、变流器、负荷及配电网络的动态实时运行。 2、建立了电网电压不平衡下的变流器数学模型,给出了基于正负序分离的多目标控制策略；并结合我国关于分布式发电低电压穿越的标准,给出了基于无功发生模式的低电压穿越控制策略。通过实时仿真平台对系统进行验证,实验结果与理论分析一致,并能够达到预期控制目标,表明该实时仿真平台对变流器与电网互动研究的有效性。 3、利用上述实时仿真平台对分布式发电接入配电网后对配电网产生的谐波、电压及线路损耗的影响进行研究,以期解决分布式发电在配电网中可能面临的实际问题。并提出了利用储能系统提高配电网电能质量的控制策略,通过实时仿真平台验证了储能变流器对功率波动的有效抑制和对并网点电压的稳定控制。
[Abstract]:With the development of new energy and distributed power generation technology , more and more converters are introduced into the power network , the structure of the traditional power grid is changed , and a series of problems are brought . At the same time , many researches on the mutual influence of the converter and the power grid are caused by the limitations of the experimental conditions . 1 . The characteristics and advantages of real - time simulation and semi - physical simulation are introduced , and the hardware configuration and using method of real - time simulation platform are introduced in detail . Based on the analysis of the principle of photovoltaic , lithium battery , converter and distribution network , the real - time simulation platform of grid - connected inverter is designed and established , and the real - time modeling method of each component model of the system is given . The dynamic real - time operation of energy source , converter , load and distribution network is realized . 2 . The mathematical model of the converter under the grid voltage imbalance is established , and a multi - objective control strategy based on positive and negative sequence separation is given . Based on our country ' s standard for low - voltage ride - through of distributed power generation , a low - voltage ride - through control strategy based on reactive power generation mode is given . Through the real - time simulation platform , the system is verified , the experimental results are consistent with the theoretical analysis , and the expected control target can be reached , which indicates the effectiveness of the real - time simulation platform on the interaction between the converter and the grid . 3 . Using the above - mentioned real - time simulation platform to study the influence of the harmonic , voltage and line loss generated by the distribution network after the distributed power generation is connected to the power distribution network , in order to solve the practical problems that the distributed power generation can be faced in the distribution network . The control strategy of improving the power quality of the distribution network by using the energy storage system is put forward , and the effective suppression of the power fluctuation and the stable control of the grid point voltage are verified by the real - time simulation platform .

【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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