Abstract
When voltage source converters (VSCs) are connected to a weak AC grid, the constant reactive power control (CRPC) is more suitable for realizing optimal reactive power dispatch than the constant AC voltage control. This paper investigates the stability issues caused by the CRPC of VSCs. An impedance model of the VSC is developed which contributes to representing the CRPC dynamics characteristics. The impact of the CRPC parameters on the q-q channel impedance is analyzed. Then, a multiple-input multiple-output model is developed to analyze the small-signal stability of a grid-connected converter system. The eigenvalue analysis for the effects of both CRPC proportional gain and grid inductance on stability is presented. The impedance-based analysis reveals that the CRPC may cause medium-high frequency oscillations in the grid-connected converter system. Finally, time-domain simulations are conducted to validate the analysis.
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