IEEE Transactions on Power Electronics· 2015Q1
Analysis of D-Q Small-Signal Impedance of Grid-Tied Inverters
- 1,297citations
- Q1SCImago
- 2015year
Short summary
Grid-tied inverters exhibit a negative incremental resistance in their q-q impedance channel, a consequence of grid synchronization, with PLL bandwidth and inverter power rating dictating its frequency range and magnitude.
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Key points
- Three-phase grid-tied inverters exhibit a negative incremental resistance in their q-q impedance channel.
- This negative resistance is a consequence of grid synchronization via the PLL.
- PLL bandwidth controls the frequency range, and inverter power rating controls the magnitude of this negative resistance.
- This impedance behavior can cause instability in weak grid conditions.
AI-generated from the title and abstract; the full text is not read.
Abstract
This paper analyzes the small-signal impedance of three-phase grid-tied inverters with feedback control and phase-locked loop (PLL) in the synchronous reference (d-q) frame. The result unveils an interesting and important feature of three-phase grid-tied inverters - namely, that its q-q channel impedance behaves as a negative incremental resistor. Moreover, this paper shows that this behavior is a consequence of grid synchronization, where the bandwidth of the PLL determines the frequency range of the resistor behavior, and the power rating of the inverter determines the magnitude of the resistor. Advanced PLL, current, and power control strategies do not change this feature. An example shows that under weak grid conditions, a change of the PLL bandwidth could lead the inverter system to unstable conditions as a result of this behavior. Harmonic resonance and instability issues can be analyzed using the proposed impedance model. Simulation and experimental measurements verify the analysis.
The authors' abstract, as published at the source. IEEE Transactions on Power Electronics, 2015 · DOI ↗
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Field: Control and Systems Engineering
Control and Systems EngineeringEngineering