The Total Low Frequency Oscillation Damping Method Based on Interline Power Flow Controller through Robust Control
Abstract
:1. Introduction
- The low-frequency oscillation damping controller is designed through IPFC devices, and it validates that IPFC can enhance the dynamic stability of the AC system effectively.
- The total controller is designed through both the active control and reactive control loop of the IPFC. A better control effect and be reached through such strategy, and the damping ability can be guaranteed by the other controller when one controller is in fault.
- The robust control theory is used when the damping controller is designed, which can make the control correct and effective on most occasions, even when the system operation mode changes.
2. The Interline Power Flow Controller
2.1. The Structure of IPFC
2.2. The Control Strategy of Mainly Controlled Converter
2.3. The Control Strategy of Auxiliary Controlled Converter
3. Total Low Frequency Oscillation Damping Method Based on System Identification
3.1. The Total Damping Strategy for IPFC
3.2. The System Modeling Method Based on PRONY Identification
3.3. The Robust Control LMI Method
4. Simulation Verifications
4.1. System Identification
4.2. Robust Controller Design
4.3. Case 1 Study: In Single Phase to Ground Fault Situation
4.4. Case 2 Study: In Temporary Line Disconnection Fault Situation
4.5. Case 3 Study: In Cascading Failure Situation
5. Conclusions
- The IPFC can be used for LFO damping and can reach satisfying effect. Especially, the different active and reactive outer current control loops can be used for oscillation control. Furthermore, the control can still be effective even one controller is out of operation.
- Compared with only one active outer control loop situation, the total control scheme with a reactive controller has more advantages. With such a design, a better control effect can be obtained, and almost 50% ratio increment can be reached with unified control compared with only active power control.
- The robust controller design through LMI and PRONY method is effective to suppress the low-frequency oscillations. In addition, the LFO can both be quickly eliminated whether it is in fault, power disturbance, and operation vary occasions. Furthermore, the damping ratio of the controlled system can increase to 48%, 21%, and 41%, respectively.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Control Strategy | IPFC1 | IPFC2 | IPFC3 |
---|---|---|---|
Control Functions | mainly controlled converter | mainly controlled converter | auxiliary controlled converter |
Active power control mode | Constant active power control | Constant active power control | Constant DC voltage control |
Reactive power control mode | Constant reactive power control | Constant reactive power control | Constant reactive power control |
IPFC1 | IPFC2 | |
---|---|---|
AC system | Rated AC voltage/kV | 380 |
IPFC Converter | Rated DC voltage/kV | 400 |
HBSM number | 180 | |
HBSM Capacitance/mF | 15 | |
Arm reactance/mH | 50 | |
idlim of MMC1/p.u. | 1.0 | |
iqlim of MMC1/p.u. | 0.4 | |
idlim of MMC2/p.u. | 1.0 | |
iqlim of MMC2/p.u. | 0.4 | |
idlim of MMC3/p.u. | 1.0 | |
iqlim of MMC3/p.u. | 1.0 | |
Line Parameter | Resistance/ohm/m | 0.1782 × 10–4 |
Inductive Reactance/ohm/m | 0.3139 × 10–3 | |
Capacitive Reactance/Mohm*m | 273.5448 | |
Line 1/km | 150 | |
Line 2/km | 150 | |
Line 3/km | 150 |
Control Strategy | Primary Frequency/Hz | Damping Ratio |
---|---|---|
Without control | 0.81 | 12% |
With only active power control | 0.79 | 24% |
With unified power control | 1.15 | 48% |
Control Strategy | Primary Frequency/Hz | Damping Ratio |
---|---|---|
Without control | 0.81 | 12% |
With only active power control | 0.80 | 16% |
With unified power control | 0.79 | 21% |
Control Strategy | Primary Frequency/Hz | Damping Ratio |
---|---|---|
Without control | 0.83 | 12% |
With only active power control | 0.67 | 36% |
With unified power control | 0.59 | 41% |
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Zhao, J.; Xu, K.; Li, Z.; Wu, S.; Wang, D. The Total Low Frequency Oscillation Damping Method Based on Interline Power Flow Controller through Robust Control. Processes 2022, 10, 2064. https://doi.org/10.3390/pr10102064
Zhao J, Xu K, Li Z, Wu S, Wang D. The Total Low Frequency Oscillation Damping Method Based on Interline Power Flow Controller through Robust Control. Processes. 2022; 10(10):2064. https://doi.org/10.3390/pr10102064
Chicago/Turabian StyleZhao, Jingbo, Ke Xu, Zheng Li, Shengjun Wu, and Dajiang Wang. 2022. "The Total Low Frequency Oscillation Damping Method Based on Interline Power Flow Controller through Robust Control" Processes 10, no. 10: 2064. https://doi.org/10.3390/pr10102064