A novel dynamic reactive power planning methodology to enhance transient voltage stability

Abstract

Summary Transient voltage stability (TVS) is an important issue for security operation with the development of power system topology and loads. Lots of research on reactive power planning mainly focus on static voltage stability. But the research on the dynamic reactive power planning considering TVS is very lacking so far. And most of them are only analyzed on some serious buses without covering all the weak faults. And some research considering TVS are limited under some conditions and not general enough for large‐scale applications. Therefore, it is an urgent task to propose a feasible dynamic reactive power planning methodology to enhance TVS. So a novel dynamic reactive power planning methodology is proposed in this paper. In addition, although some TVS assessment indices have been proposed, they may not be suitable to be used in dynamic reactive power planning in the iteration calculation. To evaluate voltage stability after contingencies, a TVS assessment index is presented. Then an approach based on compensation sensitivity analysis is discussed for the best dynamic volt ampere reactive planning candidate locations. And a dynamic reactive power planning optimization methodology based on the memetic immune algorithm for multiobjective optimization is proposed to enhance TVS with the least static volt ampere reactive compensator investment cost and power loss cost. The methodology can cover all faults through random faults selection in the optimization. Afterwards, IEEE 39 power system and Zhejiang power grid in China are illustrated and analyzed for the improvement of TVS. It is proved that the proposed dynamic reactive power planning methodology is effective and beneficial to the security operation for power system.

Application of Ordinal Optimization to Reactive Volt-Ampere Sources Planning Problems

“…The reactive volt-ampere sources planning problem belongs to a class of constrained multi-objective optimization problems. Objective functions utilized in this problem are usually due to the overall system's real losses, the cost of the installed reactive power sources, or both [21,22]. In most countries, the power network is a public facility whose investment budget needs approval from the Congress.…”

Optimized reactive power support strategy for photovoltaic inverter to intensify the dynamic voltage stability of islanded microgrid

“…In conventional distribution system, due to the absence of generation unit near to the load, flexible alternating current (AC) transmission system devices, such as static volt‐ampere reactive (VAr) compensator or distributed static synchronous compensator (D‐STATCOM), are introduced to offer fast‐acting dynamic VAr support to maintain the DVS 5,13,14 . However, installation of dynamic VAr support devices introduces additional cost.…”

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

“…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. In Reference 25, a new control strategy has been proposed with PV units to improve the DVS.…”