计及电压稳定约束的微电网动态最优潮流

发布时间：2018-01-05 14:01

本文关键词：计及电压稳定约束的微电网动态最优潮流　出处：《电力系统自动化》2017年14期 　论文类型：期刊论文

【摘要】：为使微电网并网运行满足电压稳定性和经济性要求,将改进后的小扰动电压稳定指标引入微电网最优潮流模型中,并研究了多时段动态负荷下的最优潮流算法。在有载调压变压器模型中引入虚拟节点,以消除模型中的变比及因变比而产生的高阶项,并计及分布式电源及储能单元的影响在直角坐标系中建立了微电网动态优化潮流的二阶新模型。进一步通过在拉格朗日方程进行泰勒展开时保留高阶项和利用近似最小度算法进行节点优化编号,对传统内点法进行改进。修正计算中所使用的常系数海森矩阵与改进内点法相结合,从而提出一种常系数海森矩阵内点法,有效地解决了计算精度与迭代效率之间的矛盾。在ETAP环境下建立微电网模型,应用所提方法进行优化计算,计算结果表明,在改进的小扰动电压稳定指标约束下,所提模型和算法能够满足微电网运行经济性和电压稳定性的要求。
[Abstract]:In order to meet the requirements of voltage stability and economy, the improved small disturbance voltage stability index is introduced into the optimal power flow model of microgrid. The optimal power flow algorithm under multi-period dynamic load is studied. The virtual node is introduced into the load regulating transformer model to eliminate the variable ratio and the higher order term caused by the variable ratio in the model. Taking into account the influence of distributed power generation and energy storage unit, a new second-order model for dynamic power flow optimization of microgrid in right-angle coordinate system is established. Furthermore, the higher-order term is retained and the near term is utilized in Taylor expansion of Lagrangian equation. The similar minimum degree algorithm is used to optimize the number of nodes. The traditional interior point method is improved, and the constant coefficient Heyson matrix is combined with the improved interior point method, and a constant coefficient Heyson matrix interior point method is proposed. The contradiction between calculation accuracy and iteration efficiency is solved effectively. The model of microgrid is established in ETAP environment, and the proposed method is applied to optimize calculation. The calculation results show that. Under the constraint of the improved small disturbance voltage stability index, the proposed model and algorithm can meet the requirements of microgrid operation economy and voltage stability.
【作者单位】：山东科技大学电气与自动化工程学院;青岛龙发热电有限公司;
【基金】：山东省科技发展计划资助项目(2012G0020503) 国家电网公司科技项目“含多微网的配电系统建模与运行特性研究”~~
【分类号】：TM727;TM74
【正文快照】： 上网日期:2017-05-09。0引言风机、光伏等分布式电源(DG)以微电网形式并入到大电网中,在一定程度上提高了电力系统能源利用率,改善了能源结构,缓解了能源需求与能源短缺、能源利用与环境保护之间的矛盾,但因其固有的随机性和间歇性对微电网电压稳定、网络损耗等问题均产生了不

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