This paper proposes a fast coordinated power control method based on two augmented channels (AC) in battery energy storage system (BESS) to improve inertial and voltage support capability

i.e.

a frequency-reactive power channel (FRPC) and a voltage-real power channel (VRPC). For frequency control in the power distribution system with high resistance/inductance ratio

the coupling mechanism between rate of change of frequency (RoCoF) and required reactive power (RRP) of grids is analyzed

indicating RoCoF is proportional to RRP. Thus

RoCoF is utilized in FRPC to generate reactive power for complementary inertial emulating control. Meanwhile

for voltage control

coupling characteristics between rate of change of voltage (RoCoV) and demanding real power (DRP) of grids is also studied

revealing RoCoV is proportional to DRP. Therefore

it can be adopted in VRPC to generate real power for complementary voltage control. Then

grid-voltage-modulated direct power control is selected as the inner power control loop to track power references with faster dynamic performance compared with traditional vector-oriented control. Finally

simulations and hardware-in-loop experiments validate improvement in performance of grid frequency and voltage control based on the proposed method.