计及不确定性的配电网合环点安全性与经济性评估

系统地研究了计及不确定性的配电网合环点安全性与经济性评估问题,并在某地配电网进行实际应用。首先,从配电网合环运行的实际需求出发,探讨一种配电网合环点的安全性与经济性评估的总体框架。其次,充分考虑电力系统状态的不确定性的影响,提出一种新的合环电流区间与网损区间计算方法。该方法可以确定合环电流和网损的变化范围,为配电网合环点的安全性与经济性评估提供依据。再次,提出一种新型的区间数比较方法,从可信度的角度对合环电流区间与网损区间的优劣情况进行对比。进一步提出一种新的配电网合环点的安全与经济性双层评估方法,从安全与经济两个层面选出总体最优的配电网合环点。最后,将所提方法应用于某地配电网合环点的选择中,结果表明了所提方法的可行性与有效性。

Security and economy evaluation of closed loop point of distribution network considering uncertainty

The security and economy evaluation of closed loop point of distributed network considering uncertainty is studied, and then is applied in one actual distribution network. First, responding to the requirement of loop-closed operation of distribution metwork, a framework of security and economy evaluation of closed loop point is proposed. Secondly, taking into account the uncertainty of distribution network, a method of calculating the intervals of closed loop current and power loss is given based on interval theory, such then the scopes of closed loop current and power loss are made clear, respectively, providing a basis for the security and economy evaluation. Furthermore, a novel comparison method of interval number is put forward for comparing the intervals of closed loop current and power loss in probability. The two-level evaluation measure is also presented to synthesize the security and economy evaluation results, such that the optimal closed loop point of distribution network is chosen. Finally, the proposed method is applied in one actual distribution network, and the results show its feasibility and validity.