Controls in AC/DC systems


The steady increase in inverter-interfaced generation units in transmission and distribution grids is already causing a change in global and local system control, both now and in the future. This increases the complexity of ensuring the stability of the system behaviour, which results in new challenges but also opportunities.

The IAEW researches and analyses the control of AC/DC systems using different modelling approaches. Starting with highly detailed EMT models for the short-term range, the control behavior of individual components is evaluated and the effects of interactions between the controls are determined. For the systemic analysis of the German and European interconnected grid, the IAEW has models with a target-oriented degree of abstraction. This ensures that reliable results are obtained in optimal computing time.

Typical applications of the models range from the local control of microgrids with innovative grid assets, the development of control strategies for HVDC transmission systems to system-related control strategies for converter-dominated transmission and distribution grids. Based on an overall system design, the IAEW extends the HVDC transmission systems by the contribution of active power flow control and frequency-supporting system services. In addition, the development, analysis and evaluation of various control strategies in microgrids enables stable, safe and reliable grid operation - in grid parallel operation and in island operation.