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2 months ago in Distributed Generation By Pragati

Do inverters always have to run at unity power factor?

I thought inverters were supposed to inject only real power at unity PF. But I hear modern standards require them to do reactive power too. Which is it?

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By Krirthi Answered 1 month ago

It depends on the grid's needs—and those needs have changed. At low renewable penetration, unity PF was the rule to avoid messing with local voltage. But with high renewables, inverters are now expected to provide reactive power support as a grid service, helping regulate voltage. Standards like IEEE 1547 explicitly require this capability. The "ideal" condition isn't just maximum real power export anymore—it's active contribution to grid stability. Inverters are no longer just sources. 

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