Design and Implementation of Novel Multi-Converter-Based Unified Power Quality Conditioner for Low-Voltage High-Current Distribution System
Abstract
:1. Introduction
1.1. Motivation
1.2. Literature Review
1.3. Contribution and Paper Structure
2. System Description
- Due to the parallel structure, the control algorithms of each converter are easier than for the cascade converter or multilevel module converter (MMC).
- The power rate and compensation current are promoted.
- Renewable energy and microgrid absorptive capabilities are achieved by the common DC bus and renewable energy interface.
3. Control Algorithms of UPQC
3.1. Control Algorithm of Series Converters
3.2. Control Algorithm of Shunt Converters
3.3. Control Algorithm of the Renewable Energy Interface
4. Simulation and Experimental Verification
4.1. Simulation Results
4.2. Experimental Results
4.2.1. Experimental Results of Shunt Converters
- was stable during the compensation.
- The converter had a perfect var control ability according to the compensation current detected.
- Benefiting from the three shunt converters, the compensation power increased to three-times that of one converter.
4.2.2. Experimental Results of Series Converters
4.2.3. Experimental Results of the Renewable Energy Interface
5. Discussion
6. Conclusions
Author Contributions
Funding
Conflicts of Interest
Nomenclature
Input voltage of the distribution system | |
Output voltage of the three-winding transformer | |
Input voltage of the shunt converter | |
Voltage of the common DC bus | |
Output current of the transformer | |
Output current of the shunt converter | |
Load voltage | |
Output voltage of the 3P4L converter | |
Filter inductance and DC capacitor of the shunt converter | |
Filters of the H-bridge inverters | |
LCL filters of the switch side in the 3P4L converter | |
Reference active and reactive power | |
Actual active and reactive power | |
Rated and actual angular frequency | |
Droop coefficient of power | |
Reference and actual voltage of the filter capacitor in the 3P4L converter | |
Output voltage of the 3P4L converter | |
Output voltage of renewable energy | |
UPQC | Unified power quality controller |
SVC | Static synchronous compensator |
SVG | Static var generator |
APF | Active power filters |
STATCOM | Static synchronous compensator |
DVR | Dynamic voltage regulator |
3P4L | Three-phase four-leg |
SRF | Synchronous rotating frame |
TDF | Two degrees of freedom |
q-PRc | Quasi-PR controller |
SVPWM | Space vector pulse width modulation |
VSG | Virtual synchronous generator |
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Parameters | Label | Value | Unit |
---|---|---|---|
Filter inductance of the shunt converter | 2 | mH | |
DC capacitor in each shunt converter | 4400 | F | |
Filter inductance of the H-bridge | 0.2 | mH | |
Filter capacitor of the H-bridge | 400 | F | |
Filter inductance of the switch side in the 3P4L converter | 3.2 | mH | |
Filter inductance of the grid side in the 3P4L converter | 0.8 | mH | |
Filter capacitor of the 3P4L converter | 10 | F | |
Voltage of the common DC bus | 800 | V | |
Proportional integral parameter | 4 | / | |
Proportional integral parameter | 800 | / |
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Yang, B.; Liu, K.; Zhang, S.; Zhao, J. Design and Implementation of Novel Multi-Converter-Based Unified Power Quality Conditioner for Low-Voltage High-Current Distribution System. Energies 2018, 11, 3150. https://doi.org/10.3390/en11113150
Yang B, Liu K, Zhang S, Zhao J. Design and Implementation of Novel Multi-Converter-Based Unified Power Quality Conditioner for Low-Voltage High-Current Distribution System. Energies. 2018; 11(11):3150. https://doi.org/10.3390/en11113150
Chicago/Turabian StyleYang, Bin, Kangli Liu, Sen Zhang, and Jianfeng Zhao. 2018. "Design and Implementation of Novel Multi-Converter-Based Unified Power Quality Conditioner for Low-Voltage High-Current Distribution System" Energies 11, no. 11: 3150. https://doi.org/10.3390/en11113150