计及多约束的多分布式电源接入配电网最大承载力分段算法

Segmentation Algorithm for Maximum Hosting Capacity of Distributed Generator Accessing to Distribution Network Considering Multiple Constraints

分布式电源(DG)大量并网给电能质量带来风险,评估DG接入配电网的最大承载力对DG规划具有指导意义。建立了多DG接入配电网承载力评估的优化模型:目标为DG并网容量最大,约束涉及电压偏移、电压波动、短路电流和继电保护的相关技术标准。针对该模型,提出了基于约束指标相对于DG容量灵敏度的单约束和多约束协调分段计算方法。基于不同的DG初始值,分段计算可分别采用倒推和顺推2种计算流程进行。最后计算分析了辐射型配电网在多约束多个不同类型DG情况下的系统最大承载力,表明了所提方法在计算精度和效率方面的优越性。

The integration of large number of distributed generators(DGs)brings risks to the power quality of the network which they are connected to.Thus it is instructive for DGs planning to evaluate the maximum hosting capacity of DGs accessing to a distribution network.An optimization model for evaluating the hosting capacity of the distribution network with DGs access is established.In the model,the objective is to maximize the grid-connected capacity of DGs,and the constraints involve the technical standards of voltage deviation,voltage fluctuation,short-circuit current and relay protection.Based on the sensitivity of a constraint index to DG capacity,a single-constraint segmentation algorithm and a multi-constraint coordination segmentation algorithm are proposed for the model.Based on different initial values of DG capacities,the segmentation algorithms can be carried out in backward and forward methods,respectively.Finally,the maximum hosting capacity of a radial distribution network is computed and analyzed with multiple constraints,multiple sources and multiple DG types,which shows the superiority of the proposed algorithms in the calculation accuracy and efficiency.