An Improved Commutation Prediction Algorithm to Mitigate Commutation Failure in High Voltage Direct Current
Abstract
:1. Introduction
2. Commutation Failure
Influencing Factors of Commutation Failure
- (1)
- Increasing the γ angle in normal conditions, which will consume much more reactive power.
- (2)
- When a commutation failure is detected in an HVDC system, the inverter decreases the α angle in order to increase the commutation margin and avoid commutation failure.
3. Analysis of the Response of the Commutation Failure Prediction Method for TianZhong ± 800 kV Ultra High Voltage Direct Current Project
3.1. The Commutation Failure Prediction Method in an High Voltage Direct Current Project
3.2. The Performance of Commutation Failure Prediction During the Disturbance
3.3. Analysis of the Converter Bus Voltage
4. A Novel Commutation Failure Prediction Method Based on the Harmonic Characteristics of the Converter Bus Voltage
4.1. Harmonic Detection Based on the Sliding-Window Iterative Algorithm of Discrete Fourier Transformation (DFT)
4.2. A New Commutation Failure Prediction Method
5. Experiments and Results
5.1. To Reproduce the Process with the Traditional Commutation Failure Prediction Strategy
5.2. To Verify the Proposed Commutation Failure Prediction Strategy under the Same System Configuration
5.3. To Verify the Proposed Commutation Failure Prediction Strategy Under 1000 kV Ultra High Voltage Transformer Charging
5.4. To Verify the Proposed Commutation Failure Prediction Strategy in TuanLin-FengJing ± 500 kV High Voltage Direct Current
6. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
Abbreviation
γ | Extinction Angle |
α | Firing Angle |
Xr | Commutating Reactance |
Id | Dc Current |
E2m | Commutation Voltage |
β | Trigger Advance Angle |
IVY | YY Transformer Current in Valve Side |
IVD | YD Transformer Current in Valve Side |
CFPREV | Commutation Failure Prediction |
α_CFPREV | The Output of CFPREV |
u0 | Zero Sequence Component |
uα | uαβ in α axis |
uβ | uαβ in β axis |
uαβ | The Magnitude of Rotating Vector |
ua, ub, uc | Three-phase Instantaneous Voltage of Converter Bus |
Uac_COMP | Magnitude of Uac Before Fault |
Ncur | The Latest Sampled Data Points |
x(iτ) | Sampling Data Before i Sampling Period |
TianZhong | TianShan-ZhongZhou |
UHVDC | Ultra High Voltage Direct Current |
DFT | Discrete Fourier Transform |
FFT | Fast Fourier Transformation |
CFPREV_Harm | The output of CFPREV based on harmonic detection |
Uac_Harm_Blk | Action signal of CFPREV based on harmonic detection |
RTDS | Real-time Digital Simulator |
HP | High-pass Filter |
BP | Band-pass Filter |
SC | Shunt Capacitor |
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Serial Number | Items | Units | Parameters |
---|---|---|---|
1 | Bipolar rated power | MW | 8000 |
2 | Rated voltage | kV | 800 |
3 | Rated current | kA | 5.0 |
4 | Rated firing angle at rectifier | ° | 15 |
5 | Rated extinction angle at inverter | ° | 17 |
6 | Smoothing reactor | mH | 6 × 50 |
7 | the commutating reactance | % | 24 |
8 | The distance of DC lines | km | 2192 |
Items | Location | Type |
---|---|---|
DC filter | TianShan | 1*HP2/39, 1*HP12/24 |
ZhongZhou | 1*HP2/39, 1*HP12/24 | |
AC filter | TianShan | 4*BP11BP13, 4*HP24/36, 3*HP3,5*SC |
ZhongZhou | 8*HP12/24, 2*HP3, 9*SC |
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Li, X.; Li, F.; Chen, S.; Li, Y.; Zou, Q.; Wu, Z.; Lin, S. An Improved Commutation Prediction Algorithm to Mitigate Commutation Failure in High Voltage Direct Current. Energies 2017, 10, 1481. https://doi.org/10.3390/en10101481
Li X, Li F, Chen S, Li Y, Zou Q, Wu Z, Lin S. An Improved Commutation Prediction Algorithm to Mitigate Commutation Failure in High Voltage Direct Current. Energies. 2017; 10(10):1481. https://doi.org/10.3390/en10101481
Chicago/Turabian StyleLi, Xinnian, Fengqi Li, Shuyong Chen, Yanan Li, Qiang Zou, Ziping Wu, and Shaobo Lin. 2017. "An Improved Commutation Prediction Algorithm to Mitigate Commutation Failure in High Voltage Direct Current" Energies 10, no. 10: 1481. https://doi.org/10.3390/en10101481