An Improved Collaborative Control Scheme to Resist Grid Voltage Unbalance for BDFG-Based Wind Turbine
Abstract
:1. Introduction
2. Modeling of BDFG (MSC) and GSC in αβ Reference Frame during Grid Voltage Unbalance
2.1. Modeling of BDFG
2.2. Modeling of GSC Side
3. Proposed Collaborative Control for BDFGWT under Grid Voltage Unbalance
3.1. Characteristics of Wind Turbine and MPPT Control
3.2. Collaborative Control Objectives for MSC and GSC
3.2.1. MSC(BDFG) Side
3.2.2. GSC Side
3.3. Proposed PR Current Controller Design for MSC and GSC
3.3.1. PR Current Controller Design for MSC
3.3.2. PR Current Controller Design for GSC
3.4. Implementation of Proposed Collaborative Control Scheme
4. Results and Discussion
5. Conclusions
- (1)
- The mathematical model of a grid-connected BDFG including MSC and GSC in the αβ reference frame during the unbalanced grid voltage condition is established.
- (2)
- An improved collaborative control between MSC and GSC is presented, where the MPPT control for a BDFGWT is also included. Under the control, the control objective of a whole BDFGWT system, including canceling the pulsations of the electromagnetic torque and the unbalance of BDFGWT’s total currents, is the fact that pulsations of BDFGWT’s total powers are capable of being realized. Therefore, the control capability of a BDFGWT to resist unbalanced grid voltage is greatly improved.
- (3)
- Improved single-loop current controllers adopting PR regulators are proposed for both MSC and GSC, where the sequence extractions for both MSC and GSC currents are not needed any more, and hence the proposed control is much simpler and the transient characteristics are also improved. Moreover, in order to achieve the decoupling control of the current and the average power, the current controller also adopts a feedforward control approach by considering all the couplings and perturbances.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
Appendix A
Parameters | Values |
---|---|
Nominal power (MW) | 2 MW |
Nominal voltage (V) | 690 V |
Nominal frequency (Hz) | 50 Hz |
rp, rc, rr (Ω) | 0.0012, 0.0072, 0.0010 |
Lp, Lc, Lr (mH) | 3.1000, 6.8890, 19.050 |
Lpr, Lcr (mH) | 6.6560, 4.8940 |
Pole pairs (pp, pc) | 2, 2 |
rg (Ω) | 3.1000 |
Lg (mH) | 0.18 |
C (uF) | 2000 |
Parameters | Values |
---|---|
Nominal power (MW) | 2 MW |
Turbine diameter | 93.4 m |
Cut-in wind speed | 3 m/s |
Nominal wind speed | 10.5 m/s |
Gear ratio | 59 |
System inertia | 60 Kg·m2 |
Friction coefficient | 0.007 |
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Traditional Control | Control Objective (1) | Control Objective (2) | Control Objective (3) | |
---|---|---|---|---|
Itotal unbalance (%) | 13.02 | 0.11 | 3.87 | 4.21 |
Ic distortion (%) | 9.72 | 3.76 | 3.76 | 3.76 |
Ptotal oscillation (%) | ±18.5 | ±5.2 | ±0.2 | ±10.6 |
Qtotal oscillation (%) | ±15.1 | ±4.6 | ±9.8 | ±0.3 |
Te oscillation (%) | ±15.3 | ±0.3 | ±0.3 | ±0.3 |
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Cai, D.; Chen, R.; Hu, S.; Sun, G.; Wang, E.; Tang, J. An Improved Collaborative Control Scheme to Resist Grid Voltage Unbalance for BDFG-Based Wind Turbine. Electronics 2024, 13, 3582. https://doi.org/10.3390/electronics13173582
Cai D, Chen R, Hu S, Sun G, Wang E, Tang J. An Improved Collaborative Control Scheme to Resist Grid Voltage Unbalance for BDFG-Based Wind Turbine. Electronics. 2024; 13(17):3582. https://doi.org/10.3390/electronics13173582
Chicago/Turabian StyleCai, Defu, Rusi Chen, Sheng Hu, Guanqun Sun, Erxi Wang, and Jinrui Tang. 2024. "An Improved Collaborative Control Scheme to Resist Grid Voltage Unbalance for BDFG-Based Wind Turbine" Electronics 13, no. 17: 3582. https://doi.org/10.3390/electronics13173582