A Repetitive Control Scheme for Harmonic Suppression of Circulating Current in Modular Multilevel Converters

He, Liqun; Zhang, Kai; Xiong, Jian; Fan, Shengfang

doi:10.1109/tpel.2014.2304978

Cited by 209 publications

(104 citation statements)

References 21 publications

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“…This structure is a classical plug-in repetitive control. The plant of the repetitive controller P(z) can be considered as a close-loop transfer function of one-cycle control as [29] shows:…”

Section: Design Of Plug-in Repetitive Controllermentioning

confidence: 99%

A Load Compensator Based on One-Cycle Control with Plug-In Repetitive Control

Hu¹,

Sun²,

Ma³

et al. 2015

Journal of Power Electronics

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This study proposes a novel one-cycle control scheme with a plug-in repetitive controller for load compensator. The novelty of this scheme lies in the combination of high dynamics and the simplicity of a one-cycle controller and good steady-state harmonic suppression ability of the repetitive controller. In addition, the proposed scheme can reduce the effect of the harmonics in phase voltage for the existence of the repetitive controller. Finally, experimental results on a three-phase, four-wire, three-level load compensator are reported to validate the effectiveness of the proposed control scheme.

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Section: Design Of Plug-in Repetitive Controllermentioning

confidence: 99%

A Load Compensator Based on One-Cycle Control with Plug-In Repetitive Control

Hu¹,

Sun²,

Ma³

et al. 2015

Journal of Power Electronics

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“…The performance of the circulating current controller is related to the control accuracy of the injected current. Many control strategies have been used in the design of current controller, such as repetitive control [7], model predictive control [8], and multiple quasi-resonant control [9], but they are only designed to regulate the even harmonics at the rated frequency. Meanwhile some other literatures like [10], [11] put emphasis on the control of the injected current but neglect the even harmonics which needs to be regulated at the same time.…”

Section: Introductionmentioning

confidence: 99%

An Improved Strategy for Modular Multilevel Converter at Low Speed Operation

Zeng

Xiao

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract.One of the main problems of the Modular Multilevel Converter (MMC) for ship electric propulsion applications is the significant magnitude of capacitor voltage ripple at low speed operation. The commonly used solution is harmonic injection. In this paper, the injection rules are explored through the dynamic relationship of MMC in a comprehensive way, and the harmonic characteristics of injection current are derived. Furthermore, the circulating current controller is modified according to the harmonics of injected current with changing frequency, which reduces the ripple of capacitor voltage effectively in a wide speed range. Simulation results are shown to demonstrate the effectiveness of the proposed method. IntroductionThe Modular Multilevel Converter (MMC) has been widely used in the field of high voltage direct current (HVDC) transmission [1,2], and has attracted increasing attention for the application of medium-voltage adjustable-speed motor drive [3,4,5]. The great potential of MMC for ship electric propulsion has been mentioned in [6]. The main challenge of the application of MMC-based drive system is the suppression of capacitor voltage ripple at low speed operation.In order to suppress the voltage ripples of submodule (SM) capacitor which increase significantly as the output frequency decreases, several schemes have been adopted. Harmonic injection is the most mature method at present. The values of injected components are usually derived from MMC's arm energy relations. Several components are neglected in the derivation process which make the derivation result lack of comprehensiveness.The injected circulating current is regulated by the circulating current controller which also controls the even harmonics caused by MMC's mechanism. The performance of the circulating current controller is related to the control accuracy of the injected current. Many control strategies have been used in the design of current controller, such as repetitive control [7], model predictive control [8], and multiple quasi-resonant control [9], but they are only designed to regulate the even harmonics at the rated frequency. Meanwhile some other literatures like [10], [11] put emphasis on the control of the injected current but neglect the even harmonics which needs to be regulated at the same time. In [12], the current controller contains six resonant controllers to regulate the second harmonic and injected harmonics at low speed operation, but it is not suitable with the changing frequency.In this paper, the injection rules are explored through the relations of mathematical model, and the proposed formula of harmonic injection is derived from the rules. The circulating current controller is

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“…Na literatura, observa-se que a maioria das soluções de consumidores para proteger cargas sensíveis são projetadas exclusivamente para lidar com as elevações e afundamentos para restaurar as tensões fundamentais [10], [11]. O desempenho de tais soluções geralmente se deteriora na presença de harmônicos [12], [13]. Assim, existe uma procura crescente de soluções que lidem de forma adequada, e simultaneamente, com diferentes tipos de perturbações, incluindo as distorções harmônicas.…”

Section: Introductionunclassified

Compensação Série Com Mínima Injeção De Potência Ou De Tensão Baseada Em Controle Repetitivo

Fernandes¹,

Costa²,

Martins³

et al. 2017

Eletrônica de Potência

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Resumo -Este trabalho propõe a utilização de um controle repetitivo para restaurar de forma dinâmica a tensão aplicada a cargas sensíveis e conectadas na rede elétrica. Além de compensar afundamentos e elevações de tensão, o controle proposto pode corrigir distorções harmônicas. Ainda, é capaz de trabalhar em referências senoidais, e assim, evita a necessidade do emprego de transformadas dq. SERIES COMPENSATION WITH MINIMUM POWER OR VOLTAGE INJECTION BASED ON REPETITIVE CONTROLAbstract -This paper proposes a control technique to be applied in a series compensator which dynamically maintain the voltage across critical loads connected to the power grid in nominal value. The technique is capable of dealing with voltage sags, swells and harmonic distortions. Furthermore, it is suitable for tracking sinusoid references, avoiding the employment of axes transformations and allowing control tuning for each phase separately. It is also proposed the integration of a recursive least-squares to synchronize the reference signals to the compensating voltages. These voltages, then, can be controlled for achieving two different objectives. In I. INTRODUÇÃOEm um cenário atual, a rede elétrica tem recebido um número crescente de cargas não-lineares e geradores distribuídos. Esta tendência coloca inúmeros desafios às concessionárias de energia e seus clientes. A proteção das cargas críticas a variações é um desses desafios, pois a rede elétrica está propensa a ter distorções de tensão causadas por estes geradores ou distorções harmônicas provocadas por não-linearidades presentes na rede [1]- [3]. As cargas críticas são aquelas em que a energia deve ser fornecida ininterruptamente em condições senoidais nominais. Exemplos destas cargas são centrais de dados, equipamentos hospitalares, máquinas controladas por computadores e acionamentos a velocidade variável.Existem duas possibilidades que podem ser aplicadas para proteger cargas sensíveis ou críticas na rede elétrica. Na primeira, o objetivo é melhorar a flexibilidade da rede de energia em ações como a redundância de fornecimento, aperfeiçoamento dos procedimentos de manutenção ou substituição de equipamentos obsoletos ou antigos [4], [5]. Essas ações são baseadas na configuração da rede e, geralmente, são tomadas pelas concessionárias de energia, que são agentes centrais para o sistema. A outra possibilidade é complementar à primeira e procura soluções locais. Entre as diversas soluções descritas na literatura, a utilização de compensadores séries ou restauradores dinâmicos de tensão para manter a tensão nominal na carga crítica, é bastante conhecida [6]- [8].A função básica de um compensador série é proteger cargas críticas contra distúrbios de tensão da rede. Os distúrbios mais comuns são os afundamentos e elevações de tensão [9]. Distorções harmônicas também são bastante comuns e são geralmente provocadas por cargas não-lineares Eletrôn. Potên., Campo Grande, v. 22, n. 3, p. 279-287, jul./set. 2017

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A Repetitive Control Scheme for Harmonic Suppression of Circulating Current in Modular Multilevel Converters

Cited by 209 publications

References 21 publications

A Load Compensator Based on One-Cycle Control with Plug-In Repetitive Control

A Load Compensator Based on One-Cycle Control with Plug-In Repetitive Control

An Improved Strategy for Modular Multilevel Converter at Low Speed Operation

Compensação Série Com Mínima Injeção De Potência Ou De Tensão Baseada Em Controle Repetitivo

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