The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Predictive Direct Power Control in MMC-HVDC System

MMC-HVDC 시스템의 예측 기반 직접전력제어

  • Lee, Kui-Jun (Dept. of Electrical Eng., Korea Nat'l Univ of Transportation)
  • Received : 2018.07.16
  • Accepted : 2018.08.06
  • Published : 2018.12.20
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Abstract

This study proposes a predictive direct power control method in a modular multilevel converter (MMC) high-voltage direct-current (HVDC) system. The conventional proportional integral (PI)-based control method uses a cascaded connection and requires an optimal gain selection procedure and additional decoupling scheme. However, the proposed control method has a simple structure for active/reactive power control due to the direct power control scheme and exhibits a fast dynamic response by predicting the future status of system variables and considering time delay. The effectiveness of the proposed method is verified by simulation results.

Keywords

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Fig. 1. Modular multilevel converter system.

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Fig. 2. Single-phase equivalent circuit.

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Fig. 3. Block diagram of the conventional PQ control based on PI controller.

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Fig. 4. Block diagram of the proposed predictive based direct power control.

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Fig. 5. Simulation waveforms of the conventional PQ control based on PI controller. (a) Bandwidth=200Hz, (b) Bandwidth=1kHz.

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Fig. 6. Simulation waveforms of the proposed predictive based direct power control.

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Fig. 7. Simulation waveforms of the proposed predictive based direct power control with parameters(Lo and Ro) error. (a) +50% error, (b) -50% error.

TABLE I SIMULATION CONDITION

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