Frequency stability assessment of decreased conventional production in the Continental European power system

; ; ; ; ; ; (). Frequency stability assessment of decreased conventional production in the Continental European power system. CIGRE Symposium Dublin, Ireland May 29 - June 2. Peer reviewed.

In this work a third party model of the Continental Europe system has been used for investigating the impact of decreased conventional generation and the corresponding introduction of renewable production. The primary study focus has been on the impact of the changed contribution to system inertia and the frequency regulation by renewables.

In the study, inertia constants and the droop of turbine governors have been altered on 11 large units in Germany (totally 10 GW) using a perturbation in the system by means of loss of two large synchronous units in France to investigate the response. Additionally the 11 units have been substituted with static generators modelled as both constant power sources and as constant impedance sources. Frequency on nodes in different countries and phase angle response have been analysed as well as cross country power flows. Linearization techniques have been used to identify some of the lowest damped oscillatory modes.

The results show that frequency decay is not equal through the system nor is it monotonous. The linear analysis has confirmed known inter-area modes such as an east-west mode of 0.13 Hz which is also clearly observable in the time domain bus phase angles. It can be concluded that the impact of substituting conventional generation of 10 GW with renewables does not significantly affect the frequency, the frequency nadir or the frequency derivative.  Furthermore, when representing renewables with static generators modelled as constant impedances sensitivities to voltage regulation of other sources and their location in relation to the static generators is observed and should be considered in detailed studies.