微电网中考虑低电压穿越问题的无功补偿器研究

发布时间：2018-05-13 21:11

本文选题：微电网 + 动态无功补偿　；参考：《辽宁工业大学》2014年硕士论文

【摘要】：伴随节能减排政策实施，新能源的大力开发与综合利用，微电网建设势在必行。目前，微电网中无功电压问题以及新能源低电压穿越问题凸显，并已成为电力界在微电网中研究的热点问题。如何采用电力电子技术与控制技术解决上述问题，具有理论意义与实用价值。本文针对微电网中考虑低电压穿越问题的无功补偿器展开研究。为了有效的解决微电网中的无功不足、谐波干扰与微电源低电压穿越问题，深入研究动态无功补偿器的拓扑结构与工作原理，建立了考虑解决低电压穿越问题的动态无功补偿装置模型。以瞬时功率理论为基础，将瞬时无功电流检测法与谐波电流检测法相结合，本文提出了一种改进的电流检测方法。该方法通过对线路电流的采集，能够将线路中的无功电流与谐波电流分量同时分离，在硬件电路结构不变与运算量相同的情况下，实现微电网综合电流补偿。针对微电网出现故障，导致低电压穿越问题的出现，利用综合补偿检测方法对微电网故障进行判断，使无功补偿装置工作在电压可调的逆变状态，实现对微电源并网节点电压的支撑，从而解决微电源低电压穿越问题。采用辽宁工业大学微电网系统的实际数据，利用MATLAB/simulink仿真平台，搭建了本文设计的无功补偿装置的仿真模型，仿真结果证明了，本文所用检测方法的准确性与无功补偿装置的有效性，，同时证明了无功补偿装置提高微电源低电压穿越能力的可行性。
[Abstract]:With the implementation of energy saving and emission reduction policy and the development and comprehensive utilization of new energy, the construction of micro grid is imperative. At present, the problem of reactive voltage and low voltage traversing of new energy sources in microgrid is prominent, and has become a hot issue in the field of power research in microgrid. How to use power electronics technology and control technology to solve the above problems has theoretical significance and practical value. In this paper, the reactive power compensator considering low voltage traversing in microgrid is studied. In order to effectively solve the problem of reactive power shortage, harmonic interference and low voltage traversing of micro power supply, the topology and working principle of dynamic reactive power compensator are deeply studied. The model of dynamic reactive power compensator considering the problem of low voltage traversing is established. Based on the instantaneous power theory, an improved current detection method is proposed by combining the instantaneous reactive current detection method with the harmonic current detection method. By collecting the line current, the reactive current and harmonic current components in the line can be separated at the same time, and the integrated current compensation of microgrid can be realized under the condition that the hardware circuit structure is the same and the calculation is the same. Aiming at the problem of low voltage traversing caused by the fault of microgrid, the fault of microgrid is judged by comprehensive compensation detection method, and the reactive power compensator works in the state of voltage adjustable inverter. The low voltage traversing problem of micro power supply can be solved by supporting the node voltage of micro power supply. Based on the actual data of Liaoning University of Technology microgrid system and MATLAB/simulink simulation platform, the simulation model of reactive power compensation device designed in this paper is set up, and the simulation results prove that, The accuracy of the detection method used in this paper and the effectiveness of the reactive power compensation device are also proved. At the same time, the feasibility of the reactive power compensation device to improve the low voltage traversing ability of the micro power supply is proved.
【学位授予单位】：辽宁工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761.12

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