计及网络拓扑下微电网有功调节对电压控制的适应性分析

发布时间：2018-05-14 12:36

本文选题：微电网 + 电压控制　；参考：《电力自动化设备》2017年04期

【摘要】：由于微电网电气联系紧密,且低压线路阻抗比较大,其电压水平不仅与无功功率相关,也与有功功率密切相关。为此,建立了节点电压与有功功率的关系模型,推导了有功-电压灵敏度矩阵。针对微电网中电源逆变器一次电压控制的调节能力有限等问题,提出了一种微电网二次电压模糊控制策略。通过节点有功-电压灵敏度建模,考虑了网络拓扑的影响;基于模糊控制理论,建立了通过调节有功功率进行微电网实时电压控制模型,丰富了微电网电压控制的手段。算例分析表明:当微电网中线路电阻与电抗之比较大时,各节点电压受有功功率变化的影响较大。应对实时功率波动引起的电压偏离,除传统的无功控制策略之外,通过调节分布式电源的有功功率,也可以有效地将各节点电压控制在允许范围内,从而提高微电网的电压质量。
[Abstract]:The voltage level of microgrid is not only related to reactive power but also to active power because of its close electrical connection and large impedance of low voltage line. For this reason, the relationship between node voltage and active power is established, and the sensitivity matrix of active power and voltage is derived. A fuzzy control strategy for secondary voltage of microgrid is proposed to solve the problem of limited regulation ability of primary voltage control of power inverter in microgrid. Based on the fuzzy control theory, the real-time voltage control model of microgrid by adjusting active power is established, which enriches the method of voltage control in microgrid. The example analysis shows that when the line resistance and reactance in the microgrid are large, the voltage of each node is greatly affected by the change of active power. To deal with the voltage deviation caused by the real-time power fluctuation, in addition to the traditional reactive power control strategy, the voltage of each node can be effectively controlled within the allowable range by adjusting the active power of the distributed power supply. Thus, the voltage quality of microgrid is improved.
【作者单位】：西安交通大学电气工程学院陕西省智能电网重点实验室;北京北变微电网技术有限公司;
【基金】：国家自然科学基金资助项目(51577146) 陕西省自然科学基础研究计划(2016JM5072)~~
【分类号】：TM727

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