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Data Center Grid Interconnection: Wait in the Seoul Metro Area or Use the AIDC Special Act Exemption — Where Does It Split?
Seoul metro data center grid impact assessments have a 2.1% approval rate. Compared with the AIDC Special Act exemption from February 2027, when to start interconnection design.
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Power Reserve Margin at 11%: Can VPP Response Replace Renewable Curtailment?
With the reserve margin down to 11% and solar output fluctuating, central-dispatch curtailment and VPP response are not the same interlock layer. Safety interlock priority and I/O map.
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KRW 2.1 Trillion for Infrastructure and a Doubled Renewable Budget: The Homework That Lands on the Grid First
Reading the 2027 budget’s KRW 2.1 trillion for chip, physical AI and AI data center infrastructure and the doubled renewable budget from an electrical engineer’s view: the path comes before capacity.
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Grid-Forming BESS Inverters Mandated: What New Interlocks Must 2027 Commercial-Operation Plants Have?
Korea Power Exchange mandates grid-forming PCS for central contract market BESS completed from 2027. The new interlocks and I/O setup: fault current ride-through, virtual inertia limit, seamless mode transfer.
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UPS Parallel Redundancy: Where N+1 and 2N Part Ways — Judge Redundancy by Load Ratio, Not Module Count
N+1 and 2N differ in where the single point of failure remains. How load growth silently drops N+1 to N, and a load-ratio-based redundancy-loss logic.
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ATS vs STS: Source Synchronism and Fault Current Decide the Transfer Method — and Whether the STS Sits Ahead of or Behind the Transformer
An ATS works between unsynchronized sources, an STS between synchronized ones. Fault transfer inhibit, out-of-phase transformer inrush and an ATS sequence.
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Virtual Power Line (VPL) Gets a ₩ 2.4 Billion Budget — Where Does the Interlock Go When ESS Is Operated Like a Transmission Line?
VPL turns ESS from a generating asset into a transmission asset. The real equipment-side change is command priority and the SOC-margin interlock, not the battery or PCS hardware.
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Grid-Forming PCS Mandate — What Changes in Interlock Design
Starting with next year’s commissioning targets, PCS with Grid-Forming capability will be mandated for the first time on the 2nd Central Contract Market BESS (540 MW class). For a new commissioning project, choosing a grid-forming PCS has moved into the advantageous position.
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When Is a Solid-State Transformer the Right Choice
A solid-state transformer (SST) is a net loss in most cases when evaluated as a straight replacement for a conventional oil-filled transformer. There is exactly one configuration where SST wins: where the load requires a power-conversion device (PCS) or rectifier bolted on right after the transformer anyway.
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Why a Power System Can’t Be Explained by the Generator Alone
When people hear “power system,” it’s easy to picture a single generator, but in reality it is one continuous chain of generation, conversion, storage, and distribution. Looking at any single stage alone cannot tell you the overall efficiency.