Small signal stability analysis of arctan power frequency droop

The microgrid is an environment constructed with the aim of controlling local distributed resources. The most common power flow control technique utilised in a standalone microgrid is- a technique known as power frequency droop. An arctan droop controller was previously presented in [1]. This paper analyses the stability of this arctan power frequency droop. SABER simulations are performed to obtain the operating points about which the system is linearised. Considering a resistive coupling the arctan droop can delay the onset of oscillatory modes. Given an inductive coupling under high output power the arctan gradient is able to maintain larger stability margins in the microgrid, for the discrete operating points analysed. Limited hardware results are provided to confirm the operating points are achievable.