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Multifunctional inverter based on virtual synchronous machine implemented in synchronous reference frame

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Abstract

A new multifunctional inverter control structure is proposed in this paper by embedding the harmonic and unbalance regulators into the virtual synchronous machine (VSM). While including the harmonic and unbalance regulators, inverters can provide support to the grid not only as VSMs, but also as active power filters (APFs) and unbalance conditioners. Different from the traditional multifunctional inverter in the stationary frame, the proposed method is implemented in the synchronous reference frame using the vector proportional-integral controllers without high pass filter for APF. Moreover, with VSM for power control and frequency tracking, harmonic and unbalance regulators can use the phase tracked by VSM so that the adaptive control is achieved regardless of the frequency variations. As a result, the simplified control structure with more operation modes is available without phase-locked loop (PLL) and unbalance regulators can reuse the voltage/current control of positive sequence. Furthermore, control decoupling condition of different functions is analysed to ensure the independent design of each function. Finally, the proposed structure is verified by MATLAB/Simulink and experiments.

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Authors and Affiliations

  1. China Electric Power Research Institute, Beijing, China

    Rongcai Pan

  2. Donghua University, Shanghai, China

    Peide Sun

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  1. Rongcai Pan
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  2. Peide Sun
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Correspondence to Rongcai Pan.

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Pan, R., Sun, P. Multifunctional inverter based on virtual synchronous machine implemented in synchronous reference frame. Electr Eng 103, 2093–2111 (2021). https://doi.org/10.1007/s00202-021-01220-w

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  • DOI: https://doi.org/10.1007/s00202-021-01220-w

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