A study of the effect of power electronic system interaction with power system voltage stability

Abstract

Summary Voltage stability has of recent been a subject of growing concern to power system utilities. In this paper, 2 techniques, one based on topological structure of power networks and the other on the conventional power flow solution, are proposed for voltage stability analysis. The network structural characteristics theory participation factor proposed is formulated to identify the weak bus of the system. The voltage stability enhancement is achieved through the incorporation of power electronic–based thyristor‐controlled series compensator device. This is done by modifying the admittance matrix and network structural characteristics theory participation factor formulated to incorporate the effect of variable reactance of thyristor‐controlled series compensator device. The second suggested approach based on power flow is also investigated. The results of both techniques are compared with the conventional approaches. The results of simulations obtained show that voltage stability enhancement can significantly be achieved from the network structural point of view, as it saves time and reduces system computational burden.

A comprehensive assessment to propose an improved line stability index

“…In this regard, these indicators may seem to be a proper tool for voltage stability assessment. Nevertheless, in the sequel, it will be shown that these indices have a major drawback, which is not considered in the literature . To explain this drawback, consider the simple network shown in Figure A, which includes three transmission lines connected in series.…”

“…Nevertheless, in the sequel, it will be shown that these indices have a major drawback, which is not considered in the literature. 35,[48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84] To explain this drawback, consider the simple network shown in Figure 13A, which includes three transmission lines connected in series. In this network, the maximum transferable power is 67 as follows: When P max passes through the transmission corridor, it is expected that the line indices calculated for line 2 (or two other ones) reach to their critical threshold to show the proximity of the operating point to stability boundary.…”

Dynamic voltage stability of unbalanced DNs with high penetration of roof‐top PV units

“…13,14 It is worth to reveal that numerous research have been conducted to contribute in better F I G U R E 1 Worldwide installed capacity of PV power understanding of the long-term voltage instability caused by large PV integration. 7,[15][16][17][18][19][20][21] In contrast, very few studies have focused on the short-term voltage stability, which is also known as dynamic voltage stability. [22][23][24][25][26][27][28] In Reference 22, the authors have investigated the impacts of LVRT by PV inverters on the DVS, and concluded that DVI is likely to occur in highly PV penetrated power systems after a severe fault if the PV inverters are incapable of providing the LVRT.…”

“…Dynamic voltage stability can be classified either in short‐term (several seconds) or long‐term (seconds to minutes) time period scale 13,14 . It is worth to reveal that numerous research have been conducted to contribute in better understanding of the long‐term voltage instability caused by large PV integration 7,15‐21 . In contrast, very few studies have focused on the short‐term voltage stability, which is also known as dynamic voltage stability 22‐28 .…”

SVC device optimal location for voltage stability enhancement based on a combined particle swarm optimization-continuation power flow technique

“…The authors in [10] proposed two approaches to identify the placement of the FACTS controller of the suitable nodes to ensure voltage stability. The first technique is based on the topological structure of power networks, while the seond technique is based on the conventional power flow [10].…”