| 引用本文: | 张忠,王建学,刘世民.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[J].电力自动化设备,2017,37(4): |
| ZHANG Zhong,WANG Jianxue,LIU Shimin.Adaptability of active-power adjustment to voltage control considering network topology of microgrid[J].Electric Power Automation Equipment,2017,37(4): |
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| 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。 |
| 关键词: 微电网 电压控制 网络拓扑 灵敏度分析 模糊控制 |
| DOI：10.16081/j.issn.1006-6047.2017.04.004 |
| 分类号:TM72 |
| 基金项目: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) |
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| Adaptability of active-power adjustment to voltage control considering network topology of microgrid |
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ZHANG Zhong1, WANG Jianxue1, LIU Shimin2
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1.Shaanxi Key Laboratory of Smart Grid, School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2.BBHT-Beijing Beibian Microgrid Technology Company, Beijing 100093, China
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| Abstract: |
| Since the electrical connection of microgrid is closer and its LV(Low Voltage) line resistance is larger, its voltage level is closely related to both active-power and reactive-power. A relationship model between bus-voltage and active-power is built and the sensitivity matrix of bus-voltage to active-power is derived. Aiming at the limited regulation capacity of DG(Distributed Generation) converters in the primary voltage control of microgrid, a fuzzy control strategy is proposed for the secondary voltage control of microgrid. A sensitivity model of active-power to bus-voltage is built, which considers the influence of network topology. A real-time voltage control model based on fuzzy control theory is built, which adjusts the active-power of microgrid to enrich the means of microgrid voltage control. Case study shows that, if the resistance-reactance ratio of microgrid line is larger, the influence of active-power on the bus-voltage is larger too. In addition to the reactive-power control, the DG active-power adjustment can be used to effectively control the bus voltage within allowed range for enhancing the voltage quality of microgrid. |
| Key words: microgrid voltage control network topology sensitivity analysis fuzzy control |
