一种交直流混联系统有功优化方法研究

Study on an Active Power Optimization Method for AC/DC Hybrid System

随着风电并网规模的不断扩大,为降低整个交直流系统的总功率损耗,需适应风电场出力的变化以实现对风电的消纳。为此,对含风电场和柔性直流输电的交直流混联系统展开研究,提出了一种交直流混联系统有功优化方法,通过建立相应的交直流混联系统有功优化模型,以交直流系统的总网损最小作为目标函数,并对其进行约束,优化含柔性直流输电的交直流系统功率输送效率。最后,以某18节点柔性直流输电交直流混联系统为算例对所提优化方法进行验证,结果表明所提优化方法不仅能够实现对风电的消纳,而且能够提高交直流系统运行的经济性。

With the continuous expansion of wind power grid-connected scale,in order to reduce the total power loss of the entire AC and DC system,it is necessary to adapt to the changes of wind farm output to achieve the absorption of wind power.Therefore,this paper studied AC-DC hybrid system with wind farm and flexible HVDC transmission,and proposed an active power optimization method for AC-DC hybrid system.By establishing the corresponding active power optimization model of AC/DC hybrid system and taking the minimum total loss of AC/DC system as the objective function and constraining it,the power transmission efficiency of AC/DC system with flexible HVDC transmission was optimized.Finally,an 18-node flexible HVDC AC/DC hybrid system was taken as an example to verify the proposed optimization method.The results show that the proposed optimization method can not only realize the absorption of wind power,but also improve the economy of AC/DC system operation.