基于原对偶内点法含电压源换流器交直流系统可用输电能力计算

Calculation of Available Transfer Capability of AC/DC Systems with Voltage Source Converters Based on the Primal-dual Interior-point Method

随着电压源换流器直流系统(VSC-HVDC)在电网中的推广和运用,快速、准确地计算含VSC-HVDC交直流混合系统可用输电能力(available transfer capability,ATC)具有重要的意义。基于内点法计算速度快、鲁棒性好等优点,考虑VSC-HVDC交直流系统灵活多变的运行控制方式等约束条件,将原对偶内点法(primal-dual interior-point method,PDIPM)应用于含VSC-HVDC交直流系统ATC的计算。首先研究含VSC-HVDC交直流系统的数学模型与稳态控制方式,其次建立含VSC-HVDC交直流系统的ATC求解模型,最后通过原对偶内点法对多组算例进行仿真和分析,验证所提模型的实用性和算法的有效性。

With the promotion and application of VSC-HVDC in the power grid,it has great significance to calculate the available transfer capability(ATC)of the hybrid AC/DC systems containing VSC-HVDC quickly and accurately.Based on fast calculation and high robustness of the interior-point method,under consideration of the constraints of the VSC-HVDC AC/DC system such as flexible operation control modes,the primal-dual interior-point method(PDIPM)was applied to ATC calculation for the AC/DC systems containing VSC-HVDC.Firstly,the mathematical model of the AC/DC system containing VSC-HVDC and its steady state control mode were studied.Secondly,an ATC solution model was established for the AC/DC system containing VSC-HVDC.Finally,several examples were simulated and analyzed in the primal-dual interior-point method to verify the practicality of the proposed model and the effectiveness of the algorithm.