Improved Indirect Model Predictive Control for Enhancing Dynamic Performance of Modular Multilevel Converter
Abstract
:1. Introduction
2. Theoretical Background
2.1. Conventional Indirect MPC
2.2. Recent Indirect MPC Approaches to Reduce the Computational Burden
3. Proposed Indirect MPC
3.1. Reduction of Calculation Burden
3.2. Improved Dynamic Performance Approach
4. Experimental Setup and Results
4.1. Experimental Setup
4.2. Experimental Results
5. Conclusions
- (1)
- In this paper, the proposed approach has just been used in a low number of SM MMC. It is significantly demanded to make a test by applying the proposed method to the MMC systems having a considerably large number of SMs.
- (2)
- In addition to the simple load in the implemented experiment, applying the proposed approach to a practical load, like motor drive, should be further investigated.
Author Contributions
Funding
Conflicts of Interest
References
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Methods | Idea to Reduce Computational Burden | Requirements | Capability of Controlling Circulating Current | Reduction of Computational Burden |
---|---|---|---|---|
Conventional indirect MPC [16] | Decouple the voltage balancing task from the cost function | No strict requirements | Good | Still high |
Voltage-level-based MPC [18] | Tolerance band around average capacitor voltage | Considering the tolerance band value | Good | Good |
FMPC [19] | Considering neighboring output voltage level | Exact look-up table | Not mentioned | No discussion |
Preselection MPC [20] | Considering neighboring output voltage level | Considering the circulating current controllability with large number of SMs | Good | Good |
Simplified indirect MPC [21] | Considering neighboring output voltage level and circulating current condition | Considering the circulating current controllability with large number of SMs | Good | Good |
No. of SMs N = 3 | Steady-State | Transient State | |
---|---|---|---|
No. of control action | Direct MPC [10] | 64 | 64 |
Indirect MPC [16] | 16 | 16 | |
Simplified indirect MPC [21] | 3 | 3 | |
Proposed method | 3 | 5,6 or 9 |
DC-link voltage Vdc(V) | 100 |
Number of SMs per arm N | 3 |
Nominal voltage VC (V) | 33.33 |
SM capacitance C (mF) | 2.2 |
Arm inductance La (mH) | 3 |
Load inductance L (mH) | 10 |
Load resistance R (Ω) | 20 |
Output frequency fo (Hz) | 60 |
Sampling frequency fsp(kHz) | 10 |
Rated MMC kVA S (kVA) | 0.1 |
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Nguyen, M.H.; Kwak, S. Improved Indirect Model Predictive Control for Enhancing Dynamic Performance of Modular Multilevel Converter. Electronics 2020, 9, 1405. https://doi.org/10.3390/electronics9091405
Nguyen MH, Kwak S. Improved Indirect Model Predictive Control for Enhancing Dynamic Performance of Modular Multilevel Converter. Electronics. 2020; 9(9):1405. https://doi.org/10.3390/electronics9091405
Chicago/Turabian StyleNguyen, Minh Hoang, and Sangshin Kwak. 2020. "Improved Indirect Model Predictive Control for Enhancing Dynamic Performance of Modular Multilevel Converter" Electronics 9, no. 9: 1405. https://doi.org/10.3390/electronics9091405