Simplified angle and voltage stability criteria for power system planning based on the short-circuit power

Abstract

SUMMARYThe article shows that for many problems appearing in power system planning and operation the shortcircuit power becomes an important and useful factor. Checking up the short-circuit power can limit a number of time consuming detailed analyses. The paper concerns mainly the power system angle and voltage stability. Detailed stability analyses of power systems are performed at short-term and mid-term planning of transmission network development. Increased load demands and market economics are pushing transmission networks closer and closer to their operational limits. Therefore it is necessary to perform even a simplified power system stability assessment also at long-term planning. The article shows that very simple criteria of angle and voltage stability based on short-circuit power can be used as screening filters for fast contingency selection. The suggested criteria have been verified for a real large-scale system.

Rotor angle small signal stability assessment in transmission network expansion planning

“…If accurate data of generation units and control systems are absent, simplified criteria for stability assessment using shortcircuit calculations of short-circuit power can be used [16]. This type of analysis provides an indicative look at the stability conditions of the power system.…”

Rare desynchronization events in power grids: On data implementation and dimensional reductions

“…In (b) and (c) the most heavily loaded lines are those connecting node 5 to nodes 1 and 2, with K 15 = 4.082 and K 25 = 4.444. For heavily loaded grids, the safety margin, (K ij − f ij )/K ij for the most heavily loaded line, is generally on the order of 5% − 30% [6,15]. Inertia M and damping γ are roughly proportional to the power input at the respective nodes, and about an order of magnitude smaller than P .…”

Rare desynchronization events in power grids: on data implementation and dimensional reductions

“…for the most loaded line [21], where f ij is the power flow from i to j, see section 4.1). This network provides a generic test case in the sense that approximate ratios between power input, inertia and damping are typical for power grids; see [6,12].…”