分布式电源电压支撑能力层次分析评价

Hierarchical analysis and evaluation of the voltage support capability of distributed generation

分布式电源(Distributed Generation,DG)大规模接入配电网,其电压支撑能力能够提升系统供电能力,改善电能质量。为量化评价DG的电压支撑能力,设计DG低电压支撑能力、限界电压合格率和限界功率损耗三项评价指标。通过功率圆限定指标评价范围,降低DG供电能力范围外节点对评价指标的影响,提高评价指标的准确性和灵敏度。改进指标间的权重系数算法,提出一种基于层次分析法的DG电压支撑能力评价方法,从低电压位置、电能质量、功率损耗三个角度量化评估配电网供电性能。根据评估结果计算判别标度,得到DG电压支撑能力综合评价结果。最后,基于某实际43节点中压配电系统进行算例仿真,验证了所提指标与评价方法的有效性。

Large-scale Distributed Generation(DG)is connected to the distribution network,and its voltage support capacity can enhance power supply capacity and improve the power quality of the power grid.Three evaluation indices are designed to quantitatively evaluate the voltage support capacity of the DG,containing the low voltage support capacity of DG,the qualified rate of the limited voltage and the limited power loss.The evaluation range of the indices is limited by a power circle to reduce the influence of the nodes outside the range of the DG's power supply capacity on the evaluation indices,and to improve the accuracy and sensitivity of the indices.In addition,an evaluation method of DG voltage supporting capacity based on an analytic hierarchy process is proposed.The calculation of weight coefficient between indices is improved,and the power supply performance of the distribution network is quantitatively evaluated from the three perspectives,containing the low voltage location,power quality and power loss.Then,the discriminant scale is calculated based on the evaluation result,and a comprehensive evaluation result of DG voltage supporting capacity is calculated.Finally,a case study is provided,based on an actual 43-node medium voltage distribution system,to verify the effectiveness of the proposed index and evaluation method.