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论文摘要内容

题名:

 模块化多电平静止同步补偿器控制系统研究

作者:

 安薇薇

语种:

 chi

学科:

 电力系统及其自动化

学位:

 工程硕士

学校:

 南京工程学院

院系:

 电力工程学院

专业:

 电气工程

导师姓名:

 孙玉坤

第二导师姓名:

 张亮

完成日期:

 2015-03-01

题目(外文):

 Research of the Control System on Static Synchronous Compensator Based Modular Multilevel Converter

关键字(中文):

 模块化多电平 静止同步补偿器 控制系统 二倍频环流 子模块电压平衡

关键字(外文):

 MMC STATCOM Control system 2nd circulating current SM Voltage balance

文摘:

 

静止同步补偿器(STATCOM)作为柔性输电系统中的重要设备得到了越来越广泛的关注。本文通过分析STATCOM拓扑结构的发展趋势及优缺点,将模块化多电平(MMC)结构应用于STATCOM,并针对MMC-STATCOM控制系统展开研究。

MMC-STATCOM作为全新的动态补偿装置,继承链式STATCOM的优良特性并克服了中点偏移问题,但对其工作特性的研究还不尽深入。为此,本文重点研究了其数学模型、内部环流、主电路参数设计、系统控制策略等关键技术,并搭建仿真模型及实验系统对上述研究内容做以验证。

本文首先分析了MMC-STATCOM的工作原理,并在此基础上推导了MMC-STATCOM的数学模型,建立了abc坐标下和dq坐标下的数学模型,得到子模块中的分布式电容等效到直流侧集中电容的数学表达式和桥臂电感等效叠加到交流侧的电感表达式,将MMC-STATCOM完全等效为传统STATCOM进行分析。

此外,论文还根据矿厂6kV母线的电压与谐波要求对MMC-STATCOM主电路的参数进行分析设计。主电路元件主要包括交流侧电感、桥臂电感、直流电容,其中桥臂电感值的选择主要和桥臂二倍频环流相关,为此进行了MMC-STATCOM内部环流的分析与证明,推导了二倍频环流的数学表达式。同时,交流侧电感、桥臂电感、直流电容三个参数的选择还综合考虑了系统动态性能指标。

另外,还重点对MMC-STATCOM的整体控制策略进行了研究,主要包括无功电流检测、电流解耦控制、子模块电容均压控制、外环功率及直流母线电压控制、载波移相脉宽调制(CPS-PWM)。对于上述控制系统的研究在Matlab平台上建立了仿真模型,验证了MMC-STATCOM原理及数学模型,并通过静态负荷和动态负荷两种情况验证了MMC-STATCOM的补偿效果、内部电气特性及对动态系统的适应性。

最后,设计了MMC-STATCOM的样机系统,数字系统采用DSP+FPGA协同控制方式,并进行了相关的硬件和软件设计。

文摘(外文):

 

The Static Synchronous Compensator (STATCOM) as one of important equipment in the flexible transmission system has been paid more and more attention. In this article, the modular multilevel converter (MMC) structure is applied to the STATCOM after analyzing the development trend and the advantages as well as the disadvantages of STATCOM topology structure. The study on MMC-STATCOM control system is described in the follow paper.

As a new dynamic compensation device MMC-STATCOM has inherited the excellent characteristics of cascaded H-bridge STATCOM and overcome the problem of midpoint offset, but the study on its operating characteristics is not quite in-depth. Therefore, this article focuses on the key technologies of MMC-STATCOM, such as the mathematical model, analyzing of the 2nd circulating current, the main circuit parameter design, system control strategies. The simulation model and experimental system have been built to verify the above contents.

First, the working principle of MMC-STATCOM is analyzed. The mathematical model of MMC-STATCOM under abc coordinate and dq coordinate are built based on the work principle and idealized assumptions. The distributed capacitance in MMC has been equivalent to the DC side lumped capacitance and the mathematical expressions can be gotten. Besides, the arm inductance has been equivalent to AC side. So the parameters analysis of MMC-STATCOM can been converted to the traditional STATCOM structure’s parameters analysis.

A great innovation in this paper is proving the existence of the 2nd circulating current in MMC bridge arm and deriving its mathematical expression based on instantaneous power conservation in MMC. Besides, the parameters of MMC-STATCOM main circuit has been analyzed and designed based on the voltage and harmonic requirements of mine 6kV bus. While the 2nd circulating current mathematical expression can be used for choosing arm inductance . At the same time, the parameters of capacitance and inductances should also consider dynamic performance of MMC-STATCOM.

In addition, the control strategy of MMC-STATCOM has been studied. It includes reactive current detection, the current decoupling control, sub-module voltage hierarchical control, outer loop power control , DC bus voltage control and CPS-SPWM modulation method. The simulation model has been built in MATLAB/SIMULINK to validate control system performance. The simulation has verified the veracity of MMC-STATCOM principles and mathematical model. The compensation effect, internal electrical characteristics and adaptability to the dynamics system have been verified through the situation of static load and dynamic load.

Finally, the experimental prototype system of MMC-STATCOM is designed. The main circuit parameters of the system are selected according to the design principles of chapter III. DSP + FPGA cooperative control mode is adopted in digital systems designing and the related hardware and software has also been designed.

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开放日期:

 2018-07-01

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