EE Power School

The dq (Park) Transformation for Inverter Control

Muhammad Sarwar — Thu, 02 Jul 2026 07:02:33 +0000

The dq transformation for inverter control: Clarke and Park, why AC becomes DC, active and reactive current, and a worked example with the matrices.

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Inside a Grid-Following Inverter: The Control Loops

Muhammad Sarwar — Wed, 01 Jul 2026 05:41:43 +0000

Grid-following inverter control: the cascaded PLL, current and outer loops, dq decoupling, IMC tuning, and why fault current is limited. With worked math.

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Inside a Grid-Forming Inverter: Droop, VSM and Power Synchronization

Muhammad Sarwar — Tue, 30 Jun 2026 20:56:15 +0000

Grid-forming control: droop, virtual synchronous machine and power synchronization, the shared voltage/current cascade, with worked droop and inertia math.

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Grid-Forming Inverter Requirements: Specs and Compliance Testing

Muhammad Sarwar — Tue, 30 Jun 2026 09:13:40 +0000

Grid-forming inverter requirements explained: GC0137, AEMO, IEEE 2800.2 and UNIFI specs, the key tests, and a worked phase-jump current-limit example.

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Stability Screening for IBR-Rich Systems Using SCR, RMS, and EMT

Muhammad Sarwar — Tue, 30 Jun 2026 09:13:17 +0000

Stability screening for IBR-rich systems: SCR and WSCR limits, when to escalate from RMS to EMT, with a worked WSCR example and real ERCOT and AEMO cases.

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SRF-PLL Design: Synchronizing an Inverter to the Grid

Muhammad Sarwar — Sat, 27 Jun 2026 17:31:29 +0000

SRF-PLL design for grid synchronization: the structure, second-order Kp and Ki tuning, the bandwidth trade-off, weak-grid limits, and DSOGI variants.

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Synchronous Condensers: Restoring System Strength to Weak Grids

Muhammad Sarwar — Sat, 27 Jun 2026 07:16:58 +0000

How a synchronous condenser restores system strength to weak grids: fault current, reactive power and inertia, with a worked SCR uplift example.

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Reliability Services From Inverter-Based Resources: What the Grid Code Requires

Muhammad Sarwar — Tue, 23 Jun 2026 05:58:01 +0000

Reliability services from inverter-based resources, mapped to grid-code rules: frequency droop, reactive support, ride-through and a 0.95 PF example.

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Data Center Load Growth: What It Means for the Power Grid

Muhammad Sarwar — Sun, 21 Jun 2026 23:42:57 +0000

Data center load growth is reshaping the power grid. See the real numbers, a worked 100 MW campus example, and why flexible load is the smarter fix.

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High IBR Penetration: The Grid Stability Challenges, Explained

Muhammad Sarwar — Sun, 21 Jun 2026 21:32:57 +0000

High IBR penetration reshapes grid stability: falling inertia, weak system strength, new control instabilities, and the fixes engineers deploy.

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