My case is like i have 2 connection point which have operates on Grid of 400Kv 3 Phase voltage and i want to transmit power from 1 point to 2 point, the distance between 2 points is 20Km also the grid of both points are unsynchronised like have different frequency. I need the schematic Diagram for this transmission. I think first i need to convert from AC to DC at point 1 then need to Transmit DC from point 1 to 2 and then convert it back to AC from DC. So which DC Transmission topology i should use. and need schematic diagram for this.
Hi,
you have a few options for this, but you must first figure out how much power you want to exchange between the two grids, and if you want power flow in both directions, and if you want to control the reactive power exchanged between the grids.
Depending on your answer you might only need a small rotary frequency converter connected to the MV grid. Or HVDC with line commutated converters (thyristors) or HVDC with voltage sourced converters.
Also - why at this location where the grids are 20km apart? Is this the closest distance or do you already have substations there? You might anyways need an AC substation with a step down transformer (at least for lower DC voltages, but this again depends on how much power you want to transmit) and filter.
The different topologies have different advantages, e.g. see table 5 of https://eepublicdownloads.entsoe.eu/clean-documents/SOC%20documents/20191203_HVDC%20links%20in%20system%20operations.pdf
Also read about Back-to-back (e.g. KF CGS).
Viktor Lenz Dear Sir, Thank you so much for your valuable answer. I want to transmit power of 200 MVA . also I need schematic diagram for the same. Actually 20 Km is the distance between 2 connection points and yes it is the shortest distance. Below is my scenario
Scenario: A power interconnector to convey max 200 MVA is to be installed between two countries A & B, separated by a shallow waterway that has a maximum depth of 25 m, the distance between the connector points is 20 km.
Assuming both countries each operate 400 kV, 3 phase voltage grid systems which are unsynchronised to each other complete the following report sections:
1. Develop outline proposals for two different HVDC interconnector schemes.
Expected content: detailed schematic diagrams of each power system to include topology, explanation of the system operation, the operation of all major system components and ratings and their construction.
2. Compare the systems proposed in one.
Expected content: comparison should be in terms, technical challenge, reliability risks and hazards and on economic grounds.
3. Power Flow Control and Assimilation
I request you to please help me for the same
Dear Pradipkumar,
waht you discribe looks like a task for a group of experts, particularly as domensioning of the elements involved is expected.
This is work for experienced teams and nothing that can be explained in a simple communication via chat.
A 200MVA-system-development is million dollar project.
Topologies to use is the smallest of you problems.
Add transformers, FACTS to fulfill grid-codes and project-management for 1km mobile construction site...
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