论文标题
评估主动分布网络灵活性：关于非线性和非凸的影响
Assessing Active Distribution Network Flexibility: On the Effects of Nonlinearities and Nonconvexities
论文作者
论文摘要
一种广泛的方法来表征主动分布网络（ADN）的汇总灵活性是使用P-Q空间中的凸多边形估算可行网络操作区域的边界。但是，在现实条件下，这种近似值可能是不准确的，例如，捕获网络的非线性性质，并且柔性单元的行为受到限制。这封信表明，使用一个带有四个灵活单元的小型ADN示例，并仅考虑网络中的非线性，到达完整的P-Q灵活性区域将需要完美的单位协调和高坡道率。没有这些要求，P-Q区域将变为非凸。因此，如果忽略了非线性和非杂种性的影响，文献中的现有方法可能会导致ADN的灵活性高估，并产生不切实际的解决方案，从而阻碍了传输和分配系统运营商之间的协调。
A widespread approach to characterise the aggregated flexibility of active distribution networks (ADNs) is to estimate the boundary of the feasible network operating areas using convex polygons in the P-Q space. However, such approximations can be inaccurate under realistic conditions where, for example, the nonlinear nature of the network is captured, and the behaviour of flexible units is constrained. This letter demonstrates, using a small ADN example with four flexible units and considering only nonlinearities from the network, that reaching the full P-Q flexibility areas would require perfect coordination of units and high ramping rates. Without these requirements, the P-Q areas become nonconvex. Thus, if the effects of nonlinearities and nonconvexities are ignored, existing approaches in the literature can result in overestimation of ADN flexibility and give rise to impractical solutions, hampering coordination between transmission and distribution system operators.
