重要区域孤岛微电网抗毁性规划初探

Preliminary Study on Stand-Alone Microgrid Invulnerability Planning in Important Areas

考虑到极端情况下重要区域配电网络的脆弱性,以逐渐成熟的微电网技术为基础,进行了以抗毁性为目标的微电网孤岛规划研究。首先,基于单个分布式发电(DG)对单个负荷供电的情况进行理论推导,建立了适用于微电网的抗毁性指标,并引入复杂网络理论优化了该指标的应用方法。以抗毁性指标最优为目标,对某重要区域孤岛微电网规划的实际问题建立了DG选址定容与网架规划交替迭代的联合规划模型,得到了随迭代次数变化的网络抗毁性指标及其对应的网架结构和DG分布情况。最后,以攻击策略为依据模拟了网络受打击情况,得到抗毁性评估结果。结果表明,抗毁性指标能较好的体现网络的抗毁性,而采用联合规划的方式能有效提升网络抗毁性。

Concerning the vulnerability of the important regional distribution network in extreme conditions,planning of the stand-alone microgird aiming at invulnerability is studied on the basis of a gradually mature microgrid technology. Firstly, an invulnerability index applied to the microgird is established through the theoretical derivation on the situation of a single distributed generation( DG) supplying a single load. Then the complex networks theory is introduced to optimize the applications of index. To solve an actual problem of the stand-alone microgrid planning in a certain important area,a joint planning model incorporating the DG locating and sizing model and the network planning model is established to optimize the suggested invulnerability index. With the varying number of iterations,the invulnerability indices and the corresponding grid structure and DG distribution are obtained. Finally, the invulnerability index is assessed in a simulated network attacking situation based on an attack strategy. The results show that the proposed index can clearly reflect the network invulnerability,and the joint planning method can effectively enhance the network invulnerability.