Some of the above problems can be eliminated with the use of new technologies, particularly those t

For decision-making deccisió to determine the type of grid to build, then s'expossen eight main disadvantages of HVDC electricity transmission systems:
Stations conversion required to connect to the mains AC are very expensive and are more complex, nelly not only in additional conversion equipment, but also in the systems of regulation and control.
Control of power such systems requires continuous communication between all extremes to which energy flow should be regulated by an active control system rather than by the inherent properties of the transmission nelly line .
Substations converters generate harmonics of current and voltage, while the conversion process is accompanied by the consumption of reactive power. As a result, you must install filters and reactive power compensators.
During short circuits in power systems ac near substations that are connected to DC power failures also affect the HVDC network.
Investors are most affected, so that a short circuit in the output side of the inverter, causing a power failure of the transport system HVDC. However, nelly before a short circuit on the input side of the rectifier are generally proportional to the voltage drop.
The number of substations within a transportation system HVDC may be greater nelly than six, so, great grand not allow differences in their capabilities. The greater the number of substations lower the network capacity.
The grounding of the transport network in DC involves installing complex and difficult, because you have to build a reliable and permanent contact to ground for proper operation and to eliminate tensions earth contact
Some of the above problems can be eliminated with the use of new technologies, particularly those that refer to a bankruptcy electric transportation system HVDC system for short circuits in the AC supply, and consumption nelly of podet reactive power is removed entirely, or mostly, with the use of thyristors.
Several research centers are working nelly on improving nelly high capacity thyristors and also new types of converters for distribution to high current capability. Finally, there are several new techniques to perfect grounding devices, that reduce the effects of electro-corrosion
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