Stability and Frequency Regulation of Inverters with Capacitive Inertia
For power electronics engineers, this work provides a stability analysis and controller design for a recently proposed inverter type, but the results are incremental as they extend known concepts to a specific topology.
The paper analyzes stability and frequency regulation of inverters with capacitive inertia, showing that a network of such inverters can achieve frequency regulation with appropriate controller design, supported by a numerical example.
In this paper, we address the problem of stability and frequency regulation of a recently proposed inverter. In this type of inverter, the DC-side capacitor emulates the inertia of a synchronous generator. First, we remodel the dynamics from the electrical power perspective. Second, using this model, we show that the system is stable if connected to a constant power load, and the frequency can be regulated by a suitable choice of the controller. Next, and as the main focus of this paper, we analyze the stability of a network of these inverters, and show that frequency regulation can be achieved by using an appropriate controller design. Finally, a numerical example is provided which illustrates the effectiveness of the method.