计及跟随型和支撑型分布式光伏的广义综合负荷模型及两阶段参数聚合等效方法

Generalized composite load model and two-stage parameter aggregation and equivalent method considering grid-following and grid-forming distributed photovoltaic

为有效聚合等值包含不同控制类型分布式光伏发电系统的配电网,提出一种计及跟随型和支撑型分布式光伏的广义综合负荷模型及两阶段模型参数聚合等效方法。通过将跟随型和支撑型光伏等效模型与传统综合负荷模型并联形成广义综合负荷模型,实现对实际配电网并网特性的有效拟合;基于参数灵敏度分析与改进的微分进化算法,通过两阶段聚合等效确定模型参数,避免模型未知参数过多带来的辨识解分散性大的弊端。基于PSCAD和MATLAB验证了所提模型的自描述能力、泛化能力和参数稳定性。

For effective aggregation and equivalence of distribution network containing different control types of distributed photovoltaic systems,a generalized composite load model and a two-stage model parameter aggregation and equivalent method considering grid-following and grid-forming distributed photovoltaic systems are proposed. The generalized composite load model is formed by paralleling the equivalent models of grid-following and grid-forming photovoltaic systems with the traditional composite load models to effectively fit the grid-connected characteristic of the actual distribution network. Based on the parameter sensitivity analysis and the improved differential evolution algorithm,the model parameters are determined by the aggregation and equivalence,which avoids the disadvantage of large dispersibility of identification solutions caused by too many unknown model parameters. The self-description ability,generalization ability and parameter stability of the proposed model are verified based on PSCAD and MATLAB.