计及出力波动的光伏电站无功支撑能力评估

在满足配电网稳定运行的前提下,充分利用光伏电站并网逆变器的额定容量,挖掘光伏的无功支撑能力,能够促使配电网经济运行,因此开展光伏电站无功支撑能力评估具有重要的现实意义。首先,提出了基于动态时间弯曲算法的无功支撑能力评估方法和评估指标体系,实现实时态的无功支撑能力评估;然后,提出了基于深度置信网络模型的光伏出力预测方法和预测指标体系,结合预测数据实现未来态的无功支撑能力预测。算例分析表明,预测的光伏电站未来态无功支撑能力与实际未来态评估结果相吻合,验证了所提评估、预测方法的有效性。

The evaluation of reactive power support capacity of photovoltaic power station considering output fluctuation

Under the premise of satisfying steady operation of distribution network, fully utilizing the rated capacity of the grid-connected inverter, and excavating the reactive power support of photovoltaic power station, which can promote economic operation of distribution network. Thus, it is of great practical significance to research the evaluation method of reactive power support for photovoltaic power station. Firstly, the evaluation method based on dynamic time warping(DTW) algorithm and the evaluation index system is proposed,so as to realize reactive power support evaluation in the real time. Then the prediction method of photovoltaic output based on deep belief network(DBN) and the predictive index system is proposed, combined with predicted data to realize reactive power support evaluation in the future state. Numerical examples show that the predicted evaluation result is highly consistent with the actual evaluation result,which verifies the effectiveness of the established evaluation and prediction method.