Analysis of transient frequency voltage coupling characteristics for power systems with a high share of wind power

Abstract

Presently, with the continuous integration of wind power, power system transient stability characteristics have changed significantly. The enhanced coupling between voltage and frequency increases the risk of system cascading faults. In this paper, the power-voltage characteristics of wind turbine generator (WTG) during low voltage ride through (LVRT) are analyzed firstly, and the frequency-voltage interaction in power systems with a high share of wind power is analyzed from aspects of frequency responses and voltage responses, respectively. Secondly, taking a simple receiving power grid as an example, the possible low-frequency low-voltage (LFLV) or low-frequency high-voltage (LFHV) problem may occur when there is a fault on the AC or DC transmission line, and it is pointed out that increase of wind power share will further worsen the LFLV or LFHV problems. Finally, the influence of wind power share on system frequency and voltage interaction is simulated on the simple receiving system, and also the Chinese central Tibet power grid with a high share of photovoltaic generation, to show the risks of LFLV and LFHV problems.