考虑经济安全性的有源配电网供电能力研究

与传统配电网不同,接入有源配电网的可控分布式电源能够参与配电网的经济运行。可控分布式电源的出力分配由主动配电网的经济调度策略确定。为实现供电能力最大化,可控分布式电源通常运行在额定状态,这与经济运行的目标相背离。而且配电网运行需满足N-1安全准则,而现有文献中的分布式电源(DG)优化运行模型均未计及N-1准则,所得出力策略未必满足系统安全要求。综上所述,为解决这一问题,提出了一种考虑经济调度和N-1安全约束的供电能力模型。以供电能力经济比最小和安全距离均衡比最小为多目标,算例表明所提模型能保证N-1安全,实现了综合考虑系统经济性、安全性下的最优,验证了所提模型是合理、有效的。

Study on Power Supply Capability of Active Distribution Network Considering Economic Security

Different from the traditional distribution network,the controllable distributed power source connected to the active distribution network can participate in the economic operation of the distribution network.The output distribution of controllable distributed power is determined by the economic dispatching strategy of the active distribution network.In order to maximize the power supply capacity,the controllable distributed power supply usually operates in a rated state,which is contrary to the goal of economic operation.Moreover,the distribution network operation must meet the N-1 safety standards,while the distributed generation(DG)optimization operation models in the existing literature do not take into account the N-1 rules,and output strategies obtained may not meet the system safety requirements.In summary,in order to solve this problem,a power supply capacity model considering economic dispatch and N-1 safety constraints is proposed.Taking the minimum power supply economic ratio and minimum safety distance equilibrium ratio as the multi-objectives,examples show that the proposed model can guarantee N-1 safety,and achieve the optimization under the comprehensive consideration of system economy and safety.It is verified that the proposed model is reasonable and effective.