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With the continuous increase of photovoltaic (PV) penetration, the voltagecontrol interactions between newly installed PV inverters and previouslydeployed on-load tap-changer (OLTC) transformers become ever more significant.To achieve coordinated voltage regulation, current methods often rely on adecision-making algorithm to fully take over the control of all devices,requiring OLTC to give up its existing tap switching logic and executecorresponding upgrades. Aiming at bridging this gap, a soft coordinationframework is proposed in this paper. Specifically, the decision-making commandsare only applied on inverters, and OLTC that retains its own operation rulewill be indirectly controlled by the changed system voltage, which is a resultof appropriately adjusting inverters' Var output. The proposed method achievesthe soft coordination by establishing a modified actor-critic algorithm totrain a proxy model of inverters. The well-trained proxy model can properlyadjust inverters' Var output to "softly" coordinate OLTC's tap operations,which finally attains coordinated voltage regulation and line lossminimization. Simulation results verify the superiority of our proposed methodover traditional ones in coordinating heterogeneous devices for voltagecontrol.

A Soft Coordination Method of Heterogeneous Devices in Distribution System Voltage Control