计及柔性直流输电系统损耗模型的交直流电网无功优化

发布时间：2018-10-22 20:41

【摘要】：柔性直流输电系统损耗会影响电网无功优化结果的准确性,因此含柔性直流的无功优化问题必须包含反映损耗随换流站无功出力变化的数学模型。传统方法是将损耗等效为恒定电阻模型,但实际工程中该方法会引起较大误差,且会得到换流站逆变和整流模式下损耗相同的不合理结果。首先对厦门柔性直流工程的无功功率特性进行分析,然后利用数值解析方法得到给定输送有功下损耗与无功的关系,进而提出一种计及柔性直流损耗的交直流无功优化模型。并在厦门电网算例中进行年大、年小方式计算,对比恒定电阻损耗模型的优化结果,验证所提模型的正确性。最后对比未投运柔性直流工程电网算例的优化结果,证明厦门柔性直流工程投运可减少厦门电网无功配置,且有利于实现无功合理分层分区平衡。
[Abstract]:The loss of flexible direct current transmission system will affect the accuracy of reactive power optimization, so the reactive power optimization problem with flexible DC must include a mathematical model reflecting the variation of loss with reactive power output of converter station. The traditional method is to equivalent the loss to the constant resistance model, but in practical engineering, this method will cause large errors, and obtain the same unreasonable results of the converter station inverter and rectifier mode. Firstly, the reactive power characteristics of Xiamen flexible DC project are analyzed, and then the relationship between the loss and reactive power under given transmission active power is obtained by using numerical analysis method, and a reactive power optimization model considering flexible DC loss is proposed. An example of Xiamen power network is given to calculate the model in a small and annual manner. The optimization results of the constant resistance loss model are compared to verify the correctness of the proposed model. Finally, by comparing the optimization results of the non-operational flexible DC engineering network, it is proved that Xiamen flexible DC project can reduce reactive power allocation of Xiamen power grid, and is conducive to realizing rational stratified and partitioned balance of reactive power.
【作者单位】：国网福建省电力有限公司经济技术研究院;
【基金】：国家电网公司科技项目(52130N14002T)~~
【分类号】：TM721.1;TM714.3

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