How to choose/design Statcom for windmill application?

[shankarums]

Hi All

I am working on Statcom for windmill applications where my statcom operate for reactive power requirement from wind generators.

But I would like to know how a basic statcom connected to bus through transformer compensates reactive power? What is the specs for the transformer such it would transfer voltage from statcom to bus.

Initially i assumed grid as ideal source and connected RL load. For this configuration If add passive type compensators , it works well in case of reactive power compensation.

But If i replace that passive comp with active comp like statcom(VSC) thro Transformer, I couldnt get that compensated, instead total reactive power increased. I have taken simple 1:1 Transformer. Thats how voltage from statcom output compensates the reactive power requirements?

should we give statcom output directly to bus instead of transformer?

Anybody can explain this and also i need continuous support for me to complete my work finally with reactive power compensation using statcom for windmill applications.


Suggest how to proceed? Since i am starting from scracth

 

[beanland]

May not here?

May not here?

Statcoms and dvar are beyond the issues that most people reading this forum will address. These are generally utility (POCO) issues. A statcom or dvar draws power from the 3-phase AC source to charge a DC bus (like a VFD). It then inverts the DC voltage back to AC but does it at a phase angle that either creates leading or lagging reactive current. The magnitude of the current determines the amount and the phase angle (+90 or -90) determines the lead/lag. Since the power electronics is not line-voltage rated, the power electronics (IGBT) will operate at 480V and a transformer will step it up to line voltage. The inverters on photovoltaic systems work this way. Full 4-quadrant VFD (regenerative drives) work this way.