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Space Vector Modulation based on Model Predictive Control to Reduce Current Ripples with Subdivided Space Voltage Vectors

전류 리플 저감을 위한 세분화된 공간전압벡터를 이용한 모델 예측 제어 기반의 SVM 방법

  • Moon, Hyun-Cheol (Dept. of Electrical and Computer Eng., Ajou University) ;
  • Lee, June-Seok (Railroad Safety Research Division, Korea Railroad Research Institute) ;
  • Lee, June-Hee (Dept. of Electrical and Computer Eng., Ajou University) ;
  • Lee, Kyo-Beum (Dept. of Electrical and Computer Eng., Ajou University)
  • Received : 2016.08.23
  • Accepted : 2016.11.28
  • Published : 2017.02.20

Abstract

This paper proposes the model predictive control with space vector modulation (SVM) method for current control of voltage-source inverter. Unlike the conventional method using a limited number of voltage vectors by switching states, the proposed method can consider various voltage vectors to identify the optimized voltage vector. The various voltage vectors are obtained by subdividing existing voltage vectors. The optimized voltage vector that minimizes the cost function is selected and applied to the inverter by using the SVM. The various voltage vectors and SVM reduce current ripples in the output AC side of the inverter compared with the conventional method. The effectiveness and performance of the proposed method are verified through simulation and experiment with a three-phase two-level voltage-source grid-connected inverter.

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Fig. 1. Three-phase two-level inverter system.

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Fig. 2. Proposed space vector diagram.

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Fig. 3. Subdivided voltage vectors of (a) sector-1, (b) sector-2 and (c) sector-3.

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Fig. 4. (a) Equivalent circuit of the inverter and (b) vector diagram of grid voltage and reference voltage.

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Fig. 5. Flow chart of the proposed method.

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Fig. 6. Block diagram of the proposed method.

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Fig. 7. Simulated results of the three-phase load currents and d-q axis voltage vectors using the conventional method.

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Fig. 8. Simulated results of the three-phase load currents and d-q axis voltage vectors using the proposed method (N=3).

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Fig. 9. Simulated results of the three-phase load currents and d-q axis voltage vectors using the proposed method(N=5).

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Fig. 10. Simulated results of (a) the conventional method and (b) the proposed method when the inductance is changed from 5 [mH] to 1 [mH].

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Fig. 11. Simulated results of the (a) three-phase load currents and (b) and when the proposed method estimates inaccurately.

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Fig. 12. Experimental results of the three-phase load currents and d-q axis voltage vectors of the conventional method.

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Fig. 14. Experimental results of the three-phase load currents and d-q axis voltage vectors of the proposed method (N=5).

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Fig. 13. Experimental results of the three-phase load currents and d-q axis voltage vectors of the proposed method (N=3).

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Fig. 15. Experimental results of the (a) the conventional method (b) the proposed method (N=5).

TABLE I 토크제어의 토크 리플 저감기법을 제안하였으나, 전압벡 VOLTAGE VECTORS BY SWITCHING STATES

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TABLE II THDi COMPARISON OF SIMULATION RESULTS

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TABLE III THDi COMPARISON OF EXPERIMENTAL RESULTS

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Acknowledgement

Supported by : 한국연구재단

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