考虑风电接入的电网静态电压安全域计算

实现快速、有效的系统安全裕度评估,能够为系统运行控制提供决策指导。为掌握电网的安全运行态势,提出一种考虑风电接入的电网静态电压安全域计算方法。首先,利用连续潮流模型并结合电压安全约束,构建系统电压安全裕度指标,用于衡量运行点的安全状态。其次,融合灵敏度方程和启发式算法求得电压安全裕度,实现负荷裕度量化评估。然后,通过引入考虑相关性的风速预测方法,为态势预测奠定基础。最后,通过IEEE 118节点测试系统验证所提方法的有效性和可行性。通过算例仿真可知,当风电渗透率较高时,风电场出力之间的相关度越大,电压安全裕度的波动范围也越大。

Calculation of power grid static voltage security region considering wind power integration

Fast and effective assessment of power systems security region can provide decision-making guidance for system operation. In order to identify operational state of power system, this paper presented a method of static voltage security region (SVSR) considering wind power integrated. Firstly, index of voltage security margin is presented by combining continu-ous power flow model and condition of limit induced bifurcation, which could quantify the level of voltage security. Then, we calculate hyper-planes of SVSR boundary by blending quasi steady state equation and heuristic algorithm. These hyper-planes assist in online assessment of security state and load margin. Further, this paper introduces the method of wind power forecasting considering correlation, which establish foundation for situation prediction. Finally, the correctness and effectiveness of the proposed method is demonstrated by cases studied in the IEEE 118-bus sys-tem. The simulation results show that when the permeability of wind power is high, the greater the correlation between wind power output and the greater the fluctuation range of voltage safety margin.