The new DC transmission based on actively commutated converter (ACC) has the ability to construct and operate the network without the risk of commutation failure

and has a good prospect in the large-scale new energy delivery. Modulation is the premise for the normal operation of ACC

but the existing high-frequency

medium-frequency

and fundamental frequency modulations all have their strengths and weakness in terms of voltage balance of series devices

harmonic characteristics

and operation efficiency

so it is difficult to adapt the modulation strategy in different scenarios and working conditions. In order to solve the above problems

this paper establishes the performance indicators of ACC modulation adapted to new energy delivery

and then quantitatively compares the AC output characteristics

DC utilization rate

and power loss of the five typical modulations

so as to realize the optimal choice of ACC modulations in complex scenarios and multiple working conditions. Finally

the ACC-HVDC electromagnetic transient simulation model is built in MATLAB/Simulink

and the above theoretical analysis and examples are verified.