The ability of a power system to maintain steady voltages close to nominal value.
Last Updated: January 18, 2026
Version: 1.0.2
Generated: January 19, 2026
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Voltage stability refers to the ability of a power system to maintain steady voltages close to nominal value at all buses in the system after being subjected to a disturbance.
Short-term voltage stability involves dynamics of fast acting load components such as induction motors, electronically controlled loads, HVDC links and inverter-based generators. The study period of interest is in the order of several seconds, similar to rotor angle stability or converter-driven stability (slow interaction type). Accordingly, models with the same degree of detail as for the above stability classes must be used. In addition, for short-term voltage stability, the dynamic modeling of loads is essential, and short circuit faults near loads are the main concern.
Long-term voltage stability involves slower acting equipment such as tap-changing transformers, thermostatically controlled loads, and generator current limiters. It usually occurs in the form of a progressive reduction of voltages at some network buses. The maximum power transfer and voltage support are further limited when some of the generators hit their field and/or armature current time-overload capability limits. The study period of interest may extend to several minutes, and long-term simulations are required for analysis of system dynamic performance.
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‘voltage stability’ means the ability of a transmission system to maintain acceptable voltages at all nodes in the transmission system in the N-situation and after being subjected to a disturbance;
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电压稳定：电力系统受到扰动后，系统电压能够保持或恢复到允许的范围内，不发生电压崩溃的能力。
Translation:
Voltage Stability: The ability of a power system to maintain or restore system voltage within an allowable range after being subjected to a disturbance, without the occurrence of voltage collapse.