基于PMU量测的智能配电网电压–功率灵敏度鲁棒估计方法

Robust Estimation Method of Voltage to Power Sensitivity for Smart Distribution Networks Based on PMU Measurements

配电网中同步相量测量技术的应用对于提高系统电压–功率灵敏度的估计精度具有重要作用。提出了一种基于同步相量量测的智能配电网电压–功率灵敏度鲁棒估计方法。首先,基于同步相量量测的历史数据和实时数据,采用最小二乘方法实现了实时电压–功率灵敏度的精确估计;进一步,考虑功率量测和电压量测均含有不良数据的情况,采用帽子值加权和最小绝对值估计方法相结合的方式,避免了最小二乘方法中删除坏数据的残差判断和迭代过程,提高了计算效率和可靠性,实现了电压–功率灵敏度的鲁棒估计;最后,通过IEEE33节点算例分析证明了所提出算法的正确性和有效性。

Application of synchronized phasor measurements improves estimation accuracy of voltage-to-power sensitivity greatly for distribution networks. A robust estimation method of voltage-to-power sensitivity for smart distribution network based on synchronized phasor measurements is proposed in this paper. Firstly, voltage-to-power sensitivity estimation is realized based on historical data and real-time data of measurements using least square estimation method. Furthermore, a least absolute estimation method weighted by hat values is proposed to suppress impact of the bad data in power and voltage measurements. The process of residual analysis and bad data deletion of least square estimation method is avoided with this method. Efficiency and reliability of computation is improved and robust estimation of voltage-to-power sensitivity is realized. Finally, case studies on IEEE 33-node test feeder verify correctness and effectiveness of the proposed method.