A Novel Fractional Delay Proportional–Integral Multi-Resonant-Type Repetitive Control Based on a Farrow-Structure Filter for Grid-Tied Inverters
Abstract
:1. Introduction
- (1)
- To reduce the computational load and memory consumption of the grid-tied inverter, an FFD filter is adopted to achieve fractional delay for the PIMR-RC system.
- (2)
- Based on the FFD filter, an FD-PIMR-RC scheme is proposed to effectively improve the quality of the grid current against frequency variations.
- (3)
- From both the steady-state and dynamic response aspects of the system, a synthesis analysis is carried out on the comparison of the control effects between the conventional integer-order PRMR-RC and the proposed FD-PIMR-RC scheme when the grid frequency fluctuates.
2. Model of the LCL-Type Grid-Tied Inverter
3. PIMR-RC
4. Design of FD-PIMR-RC
4.1. Realization of FFD Filter
4.2. Stability of FD-PIMR-RC
5. Parameter Design of FD-PIMR-RC
5.1. Proportional Gain
5.2. Design the Compensator
5.3. Design the Phase-Lead Compensator and RC Gain
5.4. Internal Mode Filter
5.5. Harmonic Suppression Analysis
6. Simulation Analysis
6.1. Steady-State Response
- Grid frequency: the grid fundamental frequency (50 Hz)
- Grid frequency fluctuations (50 ± 0.4 Hz)
6.2. Dynamic Response
7. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
Abbreviations
RC | Repetitive control |
PI | Proportional integral |
PIMR-RC | Proportional–integral multi-resonant-type repetitive control |
FFD | Farrow-structure fractional-order delay |
FD-PIMR-RC | fractional delay proportional–integral multi-resonant-type repetitive control |
DPGS | Distributed power generation systems |
THD | Total harmonic distortion |
PR | Proportional resonant |
MPC | Model predictive control |
QPR | Quasi-proportional resonant |
PMR | Proportional multi-resonant |
APF | Active power filters |
CRC | Conventional repetitive control |
FORC | Fractional-order repetitive control |
FIR | Finite impulse response |
IIR | Infinite impulse response |
PLL | Phase-locked loop |
PCC | Point common coupling |
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Computational Load | Memory Consumption | Performance | |
---|---|---|---|
Conventional fractional delay FIR filter | High | High | High approximation accuracy but needs sufficient bandwidth of the amplitude-frequency. |
Fractional delay IIR filter | High | High | Excellent dynamic performance and accurate frequency adaptation capability; the difficulty of hardware implementation is increased due to the existence of zeros and poles. |
Fractional delay Farrow-structure filter | Low | Low | Wide stability region, small tracking error, and low THD; simple hardware implementation. |
Parameter | Value |
---|---|
Inverter-side inductor: | 3.8 mH |
Grid-side inductor: | 2.2 mH |
Filter capacitor: C | 10 μF |
DC-link voltage: | 380 V |
Grid frequency: | 50 Hz |
Switching frequency: | 10 kHz |
Sampling frequency: | 10 kHz |
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Liang, F.; Lee, H.-J.; Zhao, Q. A Novel Fractional Delay Proportional–Integral Multi-Resonant-Type Repetitive Control Based on a Farrow-Structure Filter for Grid-Tied Inverters. Electronics 2023, 12, 4010. https://doi.org/10.3390/electronics12194010
Liang F, Lee H-J, Zhao Q. A Novel Fractional Delay Proportional–Integral Multi-Resonant-Type Repetitive Control Based on a Farrow-Structure Filter for Grid-Tied Inverters. Electronics. 2023; 12(19):4010. https://doi.org/10.3390/electronics12194010
Chicago/Turabian StyleLiang, Fen, Ho-Joon Lee, and Qiangsong Zhao. 2023. "A Novel Fractional Delay Proportional–Integral Multi-Resonant-Type Repetitive Control Based on a Farrow-Structure Filter for Grid-Tied Inverters" Electronics 12, no. 19: 4010. https://doi.org/10.3390/electronics12194010