标题：Optimized Autonomous Operation Control to Maintain the Frequency, Voltage and Accurate Power Sharing for DGs in Islanded Systems

作者：Li Sun ; Kai Sun ; Yunhe Hou ; Jiabing Hu

摘要：Most of the launched power electronics-enabled distributed generators (DGs) adopt phase-locked-loop (PLL) synchronization control. In this paper, we delve into two different autonomous operation control (AOC) strategies to ensure the frequency/voltage profile and accurate power sharing for such DGs in islanded systems. The commonly used AOC is based on the concept of active power-frequency ( P−f ) and reactive power-voltage magnitude ( Q−V ) droop and deployed in a decentralized way. It is frequently criticized for inaccurate reactive power sharing between DGs, subject to the mismatch in their output impedances. To cope with this issue, we first design a local AOC using the P−f and Q−V˙ (i.e., the time derivate of V ) droop concept, where the desired reactive power sharing can be achieved at the expense of a marginal and allowable V excursion. Then, we develop an optimization-based AOC that is implemented through a continuous-time alternating direction method of multipliers (ADMM) algorithm and neighborhood communication. Equilibrium analysis and local asymptotic stability of the proposed AOC strategies are both established using a Lyapunov method. Finally, simulations are carried out in two islanded systems to validate the improvement in power sharing under a wide range of possible system conditions.

发表于：IEEE Transactions on Smart Grid ( Volume: 11 , Issue: 5 , Sept. 2020 )