Abstract
Harmonic instability events between modular multilevel converter (MMC) and ac systems have been widely reported in recent years. To resolve it, this paper proposes an adaptive narrowband damping control that automatically programs, adds and adjusts damping around the oscillation frequency when detect the oscillation. The paper first presents a low-pass filter design for MMC control loops, which pushes all negative damping of MMC impedance down to the medium frequency range (< approximately 1000 Hz). This makes narrowband damping can be more targeted and easier to design because multiple harmonic oscillations are avoided. An adaptive damping control that uses online oscillation detection is then proposed, which can automatically configure the narrowband damper to provide damping to the MMC at the detected oscillation frequency. In contrast to existing narrowband damping methods, the proposed adaptive narrowband damper adjusts the damping gain (e.g., to zero when system resonance disappears) and the width of the damping range automatically based on continuous monitoring of system resonance conditions. Electromagnetic transient (EMT) simulation results validate the efficacy of the proposed method in two typical MMC-based power systems.
Original language | American English |
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Number of pages | 12 |
State | Published - 2024 |
Event | 23rd Wind & Solar Integration Workshop 2024 - Helsinki, Finland Duration: 8 Oct 2024 → 11 Oct 2024 |
Conference
Conference | 23rd Wind & Solar Integration Workshop 2024 |
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City | Helsinki, Finland |
Period | 8/10/24 → 11/10/24 |
NREL Publication Number
- NREL/CP-5D00-91149
Keywords
- active damping
- adaptive control
- harmonic stability
- online detection