Modeling and Tuning of an Improved Delayed-Signal-Cancellation PLL for Microgrid Application
- Resource Type
- Periodical
- Authors
- Rasheduzzaman, M.; Kimball, J.W.
- Source
- IEEE Transactions on Energy Conversion IEEE Trans. Energy Convers. Energy Conversion, IEEE Transactions on. 34(2):712-721 Jun, 2019
- Subject
- Power, Energy and Industry Applications
Geoscience
Phase locked loops
Delays
Frequency measurement
Mathematical model
Microgrids
Oscillators
Harmonic analysis
Phase-locked loop
synchronous reference frame PLL
delayed-signal-cancellation
- Language
- ISSN
- 0885-8969
1558-0059
An improved delayed-signal-cancellation (DSC) phase-locked loop (PLL) is proposed for microgrid applications. The conventional DSC-PLL suffers from phase and frequency measurement errors due to a fixed delay operation within the control loop. The source of this error is mathematically analyzed in this paper. The modified DSC-PLL model overcomes the error by using a positive sequence $\alpha \beta$ detector and a notch filter. The proposed method not only rejects the double frequency oscillation appearing at the output of the PLL under unbalanced loading conditions but also offers good harmonic rejection with nonlinear loads. The proposed model adds minimal complexity to the existing DSC-PLL. To ensure a fast dynamic response as well as a stable operation, a systematic approach is proposed to design the controller gains and filter parameters. The newly designed PLL is simulated and tested for performance verification purposes.