A coordinated control strategy for PV inverters to keep voltages in low voltage (LV) distribution grids within specified limits is proposed. At the top layer, an automatic voltage regulation (AVR) application is designed, which has access to voltage measurements and grid parameters from the LV distribution grid, both current and historical. The AVR application solves a constrained optimization problem, which provides a set of local control set-points that bring the voltage across the grid within bounds. The middle layer consists of a local Volt/VAR controller, which is adjusted by the AVR app, while the bottom layer is the inner-loop controller of the PV inverter. The proposed method not only improves the voltage quality in the grid but also manages reactive power outputs of PV inverters efficiently. The effectiveness of the proposed method is demonstrated on a representative low voltage feeder located in Denmark.
|Tidsskrift||I E E E Transactions on Sustainable Energy|
|Status||Afsendt - 2021|