HVDC Back-to-Back System Configuration: Explained

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In summary, the term "back to back" in the context of HVDC systems refers to a configuration where two converters are connected on the same site without a transmission line. This term is derived from a sports metaphor, indicating two games happening immediately one after another.
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DUET
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attachment.php?attachmentid=63075&stc=1&d=1382101630.png


The above diagram is for HVDC back to back system. My question is why do we call it back to back system?

Could someone please help me here?
 

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  • #2
It's a sports metaphor - like two games, back to back.

In this case it is because you see an AC system connected at one end, and another at the other end: back to back.
 
  • #3
UltrafastPED said:
like two games, back to back.
Could you please explain it? I am guessing "the two games happening immediately one after another. Correct?"
 
  • #5
The simplest configuration is the back-to-back interconnection in which two converters are on the
same site without a transmission line.

Could someone please indicate the similarity between the bold part of the above sentence and the HVDC back-to-back system diagram above?
 

What is an HVDC back to back system?

An HVDC back to back system is a type of power transmission system that converts alternating current (AC) to direct current (DC) and then back to AC. It is used to transfer high voltage power between two AC grids that are not synchronized.

How does an HVDC back to back system work?

The system uses power electronic devices, such as converters and inverters, to convert the AC power to DC and back again. The DC power is transmitted through a high voltage DC line and then converted back to AC at the receiving end. This allows for power to be transferred between grids with different frequencies or phases.

What are the advantages of using an HVDC back to back system?

One of the main advantages of this system is its ability to transfer power between grids with different frequencies or phases. It also has a lower transmission loss compared to traditional AC systems, making it more efficient. HVDC back to back systems also have a smaller footprint and can be built in areas with limited space.

What are the disadvantages of an HVDC back to back system?

One of the main disadvantages is the high initial cost of building the system. It also requires sophisticated control and protection systems, which can be expensive and complex to maintain. In addition, the DC line used in the system can be vulnerable to lightning strikes and other disturbances, which can cause disruptions in power transmission.

What are the main applications of an HVDC back to back system?

HVDC back to back systems are commonly used to connect two power grids with different frequencies or phases, such as in international power transmission. They are also used in renewable energy projects, where the power generated from sources like wind or solar needs to be converted to a different frequency or phase to be integrated into the existing grid.

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