无功补偿装置低电压穿越运行控制策略

发布时间：2018-06-25 00:03

本文选题：无功补偿装置 + 对称跌落　；参考：《合肥工业大学》2017年硕士论文

【摘要】：随着新能源产业的快速发展和大规模并网,其自身的随机性、间歇性等特点也带来了诸如电网电压闪变、波动等问题。其中一种较好的解决方案就是采用无功补偿技术。以风电机组为例,其自身的无功补偿能力有限,特别是在低电压穿越运行的过程中,需加装额外的无功补偿装置才能满足电网对于无功补偿的要求。因此,对于无功补偿装置低电压穿越运行控制策略的研究具有重要的现实意义。目前新能源电站中应用最广泛的无功补偿装置主要为SVC(静止无功补偿器)和SVG(静止无功发生器)两种。本文主要针对SVG研究其低电压穿越运行控制策略,分为电网电压对称跌落和不对称跌落两种情况。本文首先介绍了SVC和SVG的基本补偿特性及基本控制策略,为无功补偿装置低电压穿越控制系统的研究提供了理论支持。其次对SVG在电网电压对称跌落下的控制策略进行研究,明确对称跌落下的控制目标,分析SVG无功补偿对电网电压支撑的效果。再次,对SVG在电网电压不对称跌路下的控制策略进行研究,明确不对称跌落下的控制目标,并分别基于PR控制和直接功率控制作详细的控制策略分析。最后,分别搭建Matlab/Simulink仿真电路,并在实验平台进行验证,分析SVG在对称跌落及不对称跌落时控制策略的控制效果。实验结果实现了上述控制策略及其控制目标,证明了控制策略的正确性与有效性。
[Abstract]:With the rapid development of new energy industry and large-scale grid-connected, its own randomness and intermittency also bring problems such as voltage flicker and fluctuation. One of the better solutions is to use reactive power compensation technology. Taking wind turbine as an example, its own reactive power compensation ability is limited, especially in the process of low voltage traversing operation, it is necessary to install additional reactive power compensation device to meet the demand of power grid for reactive power compensation. Therefore, it is of great practical significance to study the control strategy of low voltage traversing operation of reactive power compensator. At present, SVC (static Var compensator) and SVG (static Var Generator) are the most widely used reactive power compensators in new energy power stations. In this paper, the low voltage traversing operation control strategy of SVG is studied, which can be divided into two cases: symmetrical drop and asymmetric drop. In this paper, the basic compensation characteristics and control strategies of SVC and SVG are introduced, which provide theoretical support for the research of low-voltage traversing control system of reactive power compensator. Secondly, the control strategy of SVG under the symmetrical drop of power grid voltage is studied, the control goal of the symmetrical drop is defined, and the effect of SVG reactive power compensation on the voltage support of the grid is analyzed. Thirdly, the control strategy of SVG under asymmetric voltage drop is studied, and the control target under asymmetric drop is defined, and the control strategy is analyzed in detail based on PR control and direct power control respectively. Finally, Matlab / Simulink simulation circuits are built and verified on the experimental platform, and the control effect of SVG control strategy in symmetric drop and asymmetric drop is analyzed. The experimental results show that the control strategy is correct and effective.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM761.12

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