Modular Multilevel Active Power Filter Error Feedback Model Predictive Control Strategy

Chen LIU; Shixuan LÜ; Zongpei LIU; Lijun ZHENG

doi:10.12204/j.issn.1000-7229.2024.03.010

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Electric Power Construction ›› 2024, Vol. 45 ›› Issue (3) : 107-115. DOI: 10.12204/j.issn.1000-7229.2024.03.010

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Modular Multilevel Active Power Filter Error Feedback Model Predictive Control Strategy

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Abstract

The application of an active power filter (APF) at high voltage and large capacity requires the use of a modular multilevel converter structure (MMC). However, owing to the deviation of the system impedance and other parameters from the actual parameters, the predicted output value of the traditional model predictive control (MPC) loses its optimality, which ultimately affects the compensation effect of the MMC-APF. Therefore, this paper proposes an error feedback model predictive control strategy for MMC-APF. Combining the MPC and voltage sorting algorithms, the calculation amount of the switching state in each control period is reduced from $C 2 N N$ times to N+1 times, and the evaluation functions of the output compensation harmonic control, circulating current suppression, and submodule capacity energy balance control are designed. Simultaneously, error feedback is introduced to correct the predicted value. The steady-state tracking error between the predicted and output values is reduced to improve the harmonic compensation effect of the current at the network side, as well as realize effective suppression of the circulation and capacitive energy balance of the submodules. The simulation results show that MMC-APF can reduce the current harmonic content from 27.6% to 0.2% using the proposed control strategy, proving the correctness and effectiveness of the proposed control strategy.

Key words

modular multilevel converter(MMC) / active power filter(APF) / error feedback / model predictive control(MPC)

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Chen LIU , Shixuan LÜ , Zongpei LIU , et al. Modular Multilevel Active Power Filter Error Feedback Model Predictive Control Strategy[J]. Electric Power Construction. 2024, 45(3): 107-115 https://doi.org/10.12204/j.issn.1000-7229.2024.03.010

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There are many advantages for modular multilevelconverter (MMC), such as modular structure, scalability and reduced harmonics,which makes it <a name="OLE_LINK1"></a>become a potential converter technologyfor high voltage direct current (HVDC) transmission system. The basic topology structureand working principle are introduced, capacitor voltage fluctuation andcirculation current are analyzed, and point out the necessity of controlling.Capacitor voltage balancing control based on circulation current suppressionstrategy are applied to keep voltage stability of <a name="OLE_LINK11"></a>sub-module(SM) capacitor and suppress circulation current. Circulation current suppressioncontroller based on low pass filter and quasi-proportional resonant controlleris designed and added to additional capacitor voltage balancing controlstrategy. The effectiveness and <a href="http://www.so.com/link?url=http%3A%2F%2Fdict.youdao.com%2Fsearch%3Fq%3Dfeasibility%26keyfrom%3Dhao360&q=%E5%8F%AF%E8%A1%8C%E6%80%A7%E8%8B%B1%E6%96%87%E6%80%8E%E4%B9%88%E8%AF%B4&ts=1501127647&t=9757149849292ac8de66ad496321811" target="_blank">feasibility</a> of the proposedmethod is proved by Matlab/Simulink, the simulation results show that the fluctuation of capacitorvoltages as well as the circulating current can be confined into acceptable<b> </b>range.

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Abstract

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Cited in this article [1] Abstract

Aim

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