A Methodology for Determining Permissible Operating Region of Power Systems According to Conditions of Static Stability Limit

Abstract

Abstract:For power systems with long-distance ultra-high-voltage (UHV) transmission lines, power transmission limits are often determined by static stability limits. Therefore, the assessment of stability and finding solutions to improve the stability reserve are essential for the operation of the system. This article presents an analytical approach to construct limit characteristics according to static stability conditions on a power plane. Based on the approach proposed, a program is developed and tested on a system with long-distance UHV transmission lines, showing a good performance.

Assessing Power System Stability Following Load Changes and Considering Uncertainty

“…For an electrical power system with N buses (excluding a grounding bus, with F generation buses, bus 1 is considered as the slack bus), in order to examine the stability of the system according to the change at a certain load bus, first, we use the algorithm discussed in Section II to obtain the simplified equivalent diagram for the considered network. When the system is operating at a certain state with known network configuration, generating power, load, ect., we increase load at the considered bus and use the pragmatic criterion dQ/dV presented in [26,30] to construct the permissible operating region on a power plane under the conditions of a static stability limit as in Figure 5. In Figure 5, M1 is a certain operating point of the load considered belonging to stable region, while M2 belongs to unstable region of the system (see Figure 1).…”

“…Hence, voltage stability boundary needs to be plotted on a power plane [17]. It will form a P-Q curve [8, [22][23][24][25][26] that is very useful to determine boundary and operating regions for the system. Once the boundary is determined, the distance from the operating point to the voltage collape of the system can be directly assessed.…”

A Systematic PVQV-Curves Approach for Investigating the Impact of Solar Photovoltaic-Generator in Power System Using PowerWorld Simulator

“…Thus, the impacts of grid-connected RES on system voltage stability should be well studied [19,20]. Voltage stability is defined as the ability of the power system to maintain steady acceptable voltages at all buses in the network under normal operating conditions or after being subjected to a disturbance [21][22][23]. The level of voltage stability in the power system is mostly based on the strength of the network and the size of power transfer.…”