主动配电网供电能力实时评估方法

随着主动配电网的不断成熟,科学地对它的供电能力进行灵活的实时评估,找到并突破供电瓶颈,才能兼顾配电网运行的经济性、可靠性以及安全性。针对分布式电源出力的不确定性以及电网负荷周期性变化特点,提出了一种主动配电网供电能力实时评估方法。考虑了配电网中多种分布式电源接入的情况,利用预测技术得到未来时刻的负荷及分布式电源的出力,以配电网能够承担的最大负荷为目标函数,以系统的安全运行要求为约束条件,建立了数学模型。该模型不仅能够对未来一段时间内配电网的供电能力和供电裕度进行实时评估,还能够给出限制系统供电能力的供电瓶颈序列,从而使调度人员能够根据评估结果提前采取相应措施以保证电网运行的安全性和可靠性,并针对具体的瓶颈设备进行改造,提高系统的供电能力。

Real-Time Evaluation for Load Capability of Active Distribution Network

This paper proposes a real-time evaluation method for power supply capacity of active distribution network with distributed generation (DG) based on the uncertainty of DG output and the cyclical change characteristics of power grid load. The method considers the situation with the access of various types of DG in distribution network and obtains the future load and DG output through prediction. The optimization model is established using the maximum load that can be supplied by distribution network as objective function and the safe operation requirements of the system as constraint conditions. Not only can a real-time evaluation of power supply capacity and power supply margin of distribution network be provided for a period of time in the future, but also can a series of power supply bottlenecks that restrict power supply capacity be given. The findings allow dispatchers to take corresponding measures in advance according to the evaluation results to ensure the safety and reliability of power grid operation. Additionally bottlenecks discovered can be reformed to explore the potential power supply capacity.