1)Frequency  of  supply

2)Medium and type of interconnections .

3) Surge Impedance loading 

4) Different types of sources of losses(Corona or power loss etc.)

5)Leakage impedance of the wire

6)Harmonics Profile

7)Any transient phenomena or synchronisation involved etc.

Thanks Saptarshi 

It is appropriate to begin by looking at the overall issue of network performance. In designing electric power networks or implementing major expansions to existing networks, a number of the key issues regarding the technical performance of the network at both transmission and distribution level must be ascertained. These include:

Voltage regulation

Voltage fluctuations

Electrical losses

Distribution plant loading and utilization

Fault level

Generation stability

Harmonics

Phase balancing

Supply availability and

System security

Studies and analysis are conducted from time to time to ascertain the operating state of a network, taking into account load growth projections for the future. Undue stresses on the system or anticipated problems are determined from power flow analysis or during operation and maintenance. Such analysis include an assessment of the voltage profile, voltage regulation and fluctuations, magnitude of electrical losses, distribution plant loading and utilization, fault analysis, generation stability, the level of harmonics in the system, supply availability and system security.

With this background, you can measure the performance of an MVDC vs MVAC network using these parameters as a starting point, before concentrating on the critical area of harmonics; its sources/causes, and mitigation measures.