含柔性直流电网的交直流混联系统潮流优化控制
发布时间：2019-01-15 06:42
【摘要】：含柔性直流电网的交直流混联系统中换流站功率参考值和下垂系数分别决定了换流站功率分配以及直流电压与直流功率间的斜率控制关系,进而决定了整个交直流混联系统的潮流分布,因此功率参考值和下垂系数的选取至关重要。为此,提出一种含柔性直流电网的交直流混联系统潮流优化控制策略,对功率参考值和下垂系数进行优化,以实现系统网络损耗和直流电压偏差率综合最小的目标。首先,针对含柔性直流电网的交直流混联系统建立了换流站模型、交流系统模型和直流电网模型,并建立了直流电网在主从运行方式或下垂运行方式下的控制方程统一表达式。然后,基于含柔性直流电网的交直流混联系统最优潮流,在线自适应修正换流站功率参考值和下垂系数。最后,对不同运行方式下含五端柔性直流电网的修正IEEE 39和IEEE 118节点交直流混联系统进行计算分析,其结果验证了所述方法的有效性。
[Abstract]:In the AC / DC hybrid system with flexible DC network, the power reference value and sag coefficient of converter station determine the power distribution of converter station and the slope control relationship between DC voltage and DC power, respectively. Thus, the power flow distribution of the AC / DC hybrid system is determined, so the selection of power reference value and sag coefficient is very important. Therefore, an optimal power flow control strategy for AC / DC hybrid system with flexible DC network is proposed. The power reference value and sag coefficient are optimized to achieve the goal of minimum network loss and DC voltage deviation rate. First of all, the converter station model, AC system model and DC network model are established for the AC / DC hybrid system with flexible DC network, and the unified expression of the control equation of DC network under master-slave operation mode or droop operation mode is established. Then, based on the optimal power flow of AC / DC hybrid system with flexible DC network, the power reference value and sag coefficient of converter station are adaptively corrected online. Finally, the modified IEEE 39 and IEEE 118 bus AC / DC hybrid systems with five terminals flexible DC network under different operation modes are calculated and analyzed. The results show that the proposed method is effective.
【作者单位】： 四川大学电气信息学院;
【基金】：国家电网公司科技项目(SGRIZLKJ[2015]457)~~
【分类号】：TM721.3
本文编号：2408936
[Abstract]:In the AC / DC hybrid system with flexible DC network, the power reference value and sag coefficient of converter station determine the power distribution of converter station and the slope control relationship between DC voltage and DC power, respectively. Thus, the power flow distribution of the AC / DC hybrid system is determined, so the selection of power reference value and sag coefficient is very important. Therefore, an optimal power flow control strategy for AC / DC hybrid system with flexible DC network is proposed. The power reference value and sag coefficient are optimized to achieve the goal of minimum network loss and DC voltage deviation rate. First of all, the converter station model, AC system model and DC network model are established for the AC / DC hybrid system with flexible DC network, and the unified expression of the control equation of DC network under master-slave operation mode or droop operation mode is established. Then, based on the optimal power flow of AC / DC hybrid system with flexible DC network, the power reference value and sag coefficient of converter station are adaptively corrected online. Finally, the modified IEEE 39 and IEEE 118 bus AC / DC hybrid systems with five terminals flexible DC network under different operation modes are calculated and analyzed. The results show that the proposed method is effective.
【作者单位】： 四川大学电气信息学院;
【基金】：国家电网公司科技项目(SGRIZLKJ[2015]457)~~
【分类号】：TM721.3
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