计及节点脆弱程度的新能源消纳能力风险评估

Risk Assessment of New Energy Consumption Capacity Considering Node Vulnerability

随着在电网中新能源接入比例的逐步提高,系统整体的脆弱程度上升,为分析新能源接入后对系统脆弱程度的影响,针对负荷节点是否含新能源接入进行分类,建立不同的负荷节点-系统的短路容量比数学模型反映新能源接入带来的影响。结合新能源渗透率,综合考虑新能源消纳能力以及新能源接入后的系统脆弱程度,提出新能源消纳风险指标。结合IEEE 39节点系统进行仿真,考虑系统运行约束及新能源出力波动时的系统暂态稳定性,以风险指标最大为目标函数,研究不同新能源接入容量及功率因数对应的不同场景对风险指标的影响,求解系统兼顾新能源消纳与系统脆弱程度的最佳运行点。仿真结果表明,所提出的新能源消纳风险指标可以有效反映不同新能源接入容量下,系统整体的脆弱程度及区域新能源的消纳能力。

With the gradual increase in the proportion of new energy access in the power grid, the overall vulnerability of the system has risen. To analyze the impact of new energy access on the vulnerability of the system, the load nodes are classified aiming at whether a load node contains new energy, and the different mathematical models of load-system short circuit capacity ratio are constructed to reflect the impact of new energy access. Combined with the penetration rate, a new energy consumption risk indicator is proposed. Considering the system operation constraints and the transient stability of the system when the new energy output fluctuates and taking the maximum risk indicator as the objective function and studying the effect of different scenarios of different new energy access capacity and power factor on the risk indicator, the simulation on the IEEE 39 node system solves the optimal operating point of the system with new energy consumption and system vulnerability. The results show that the proposed new energy consumption risk indicator can effectively reflect the overall vulnerability and the new energy consumption capacity in the region under different new energy access capacities.