An Optimal PR Control Strategy with Load Current Observer for a Three-Phase Voltage Source Inverter
Abstract
:1. Introduction
2. Mathematical Model
2.1. Model of Three-Phase Inverter
2.2. Model of PR Regulator
2.3. Model of Load Current Observer (LCO)
3. Control Structure and Parameters Design
Parameters | Value |
---|---|
0.3 | |
150 | |
100 | |
20 | |
80 | |
5 | |
P | 15 |
Parameters | Value |
---|---|
DC-link voltage | 700 V |
Output voltage | 220 V |
Output frequency | 50 Hz |
Switching and Sampling frequency | 12,800 Hz |
Output Filter R | 0.5 Ω |
Output Filter L | 2 mH |
Output Filter C | 15 uF |
4. Simulation and Laboratory Experiments
4.1. Simulation Study
- Scenario 1: The balanced resistive load is applied to the inverter output terminals at 0.03 s and then cut off at 0.1 s.
- Scenario 2: The unbalanced resistive load is applied to the inverter output terminals at 0.03 s and then cut off at 0.1 s.
- Scenario 3: The nonlinear resistive load is applied to the inverter output terminals at 0.03 s and then cut off at 0.1 s.
Items | Value |
---|---|
50 Ω | |
20 µF |
4.2. Experimental Test
5. Conclusions and Future Work
- (1)
- The proposed control strategy is conducted in a stationary αβ frame, which has a feature of extensibility and suitability and is convenient for the implementation of multiple PR regulators with different center frequencies. Furthermore, it is easy and simple to design parameters of controllers for the reason that control signals under α-β coordinates need do not have to be decoupled.
- (2)
- The proposed control strategy applies load current as feedforward of dual-loop control, which makes a great contribution to its outstanding performance in voltage control such as zero steady-state error and low THD. Furthermore, the proposed control strategy has excellent dynamics including quick dynamic response and short regulation time, all of which ensure that the BESS has a strong ability to support unbalanced and nonlinear loads.
- (3)
- The proposed strategy can perfectly support renewable energy, which is beneficial for the spread and development of distributed generations.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Dou, X.; Yang, K.; Quan, X.; Hu, Q.; Wu, Z.; Zhao, B.; Li, P.; Zhang, S.; Jiao, Y. An Optimal PR Control Strategy with Load Current Observer for a Three-Phase Voltage Source Inverter. Energies 2015, 8, 7542-7562. https://doi.org/10.3390/en8087542
Dou X, Yang K, Quan X, Hu Q, Wu Z, Zhao B, Li P, Zhang S, Jiao Y. An Optimal PR Control Strategy with Load Current Observer for a Three-Phase Voltage Source Inverter. Energies. 2015; 8(8):7542-7562. https://doi.org/10.3390/en8087542
Chicago/Turabian StyleDou, Xiaobo, Kang Yang, Xiangjun Quan, Qinran Hu, Zaijun Wu, Bo Zhao, Peng Li, Shizhan Zhang, and Yang Jiao. 2015. "An Optimal PR Control Strategy with Load Current Observer for a Three-Phase Voltage Source Inverter" Energies 8, no. 8: 7542-7562. https://doi.org/10.3390/en8087542