Robust Predictive Control of Grid-Tied Converters Based on Direct Power Control

Fischer, Jonathan I.; González, Salvador Mora; Carugati, Ignacio; Herran, Mario A.; Judewicz, Marcos G.; Carrica, Daniel

doi:10.1109/tpel.2013.2294919

Cited by 72 publications

(41 citation statements)

References 26 publications

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“…Diferentes controladores han sido desarrollados a partir del concepto original para mejorar la respuesta del inversor en sistemas con conexión a red. En [12], el control predictivo es mejorado utilizando estimación pa-ramétrica, mientras que en [13] se desarrolla un control predictivo robusto de corriente. Por su parte, en [14] se diseña un filtro para disminuir la distorsión armónica de la corriente inyectada en el punto de conexión.…”

Section: Introductionunclassified

Análisis comparativo del control predictivo de corriente en convertidores VSI empleados en la conexión a red de energías renovables

Murillo-Yarce

Alzate-Gomez

Escobar-Mejía

2018

TecnoL.

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ResumenEste artículo analiza el desempeño del control de corriente predictivo en la operación de inversores fuente de voltaje o Voltage Source Inverter (VSI), que sirven de elemento de conexión de energías renovables a la red eléctrica. El VSI es comúnmente utilizado para convertir señales de corriente continua, obtenidas a partir de fuentes renovables o de sistemas de acumulación, en señales de corriente alterna de amplitud y frecuencia constantes. Con este propósito, se implementa una estrategia que define la secuencia de conmutación de los semiconductores de potencia del convertidor conocida como técnica PWM. Además, se requiere realizar el control de la corriente que se inyecta a la red requiriendo un algoritmo de control adicional, que actúa en conjunto con la técnica PWM. El principal aporte del artículo consiste en demostrar que el control de corriente predictivo presenta mejores características en comparación con el control orientado de corriente, que es la estrategia más conocida. Inicialmente, se analizan las técnicas PWM convencionales y luego, se realiza la formulación de las técnicas de control de corriente. El control predictivo minimiza el error futuro de la corriente definiendo el mejor estado de conmutación en cada período. Las dos técnicas de control de corriente presentan buenos resultados. Pero sobresale el control predictivo por su simplicidad, fácil implementación, bajo contenido armónico y menor tiempo de respuesta. Palabras claveConvertidor fuente de tensión, técnica PWM, control de corriente, control orientado, control predictivo. AbstractThis paper analyzes the performance of the predictive current control technique in the operation of Voltage Source Inverters (VSI) used to connect renewable resources to the power grid. VSIs are commonly used to convert DC power from renewable energy sources, such as energy storage units, solar power plants and fuel cells, to AC power with constant magnitude and frequency. For this purpose, a strategy known as PWM was implemented to determine the switching sequence of the converter's power semiconductors. In addition, the current being injected into the grid must be controlled; thus, an additional control algorithm was required to operate in conjunction with the PWM technique. The main contribution of this paper is demonstrating that predictive current control presents better characteristics than current-oriented control, the most widely used strategy. The first section analyzes conventional PWM techniques and, in the second part, current control techniques are formulated. Predictive control minimizes the future error of the current by defining the best switching state in each period. The two current control techniques present good performance. However, predictive control is preferable due to its simplicity, easy implementation, low harmonic content, as well as reduced response time.

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Section: Introductionunclassified

Análisis comparativo del control predictivo de corriente en convertidores VSI empleados en la conexión a red de energías renovables

Murillo-Yarce

Alzate-Gomez

Escobar-Mejía

2018

TecnoL.

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“…For this reason, the harmonic restriction standards such as IEEE-519 or IEC 61000-3-2 have been published to limit the amount of harmonic current injected into utility grid [12]. In the same vein, many researchers have investigated the strategies to improve the power quality of the grid connected inverter by mitigating the current harmonics [11][12][13][14][15][16][17][18]. As a selective harmonic compensation scheme, a proportional integral (PI)-resonant current controller has been presented to compensate low-order harmonic terms selectively [13,16].…”

Section: Introductionmentioning

confidence: 99%

“…As a selective harmonic compensation scheme, a proportional integral (PI)-resonant current controller has been presented to compensate low-order harmonic terms selectively [13,16]. As an alternative method, nonselective harmonic compensation techniques such as the sliding mode control [11], predictive control [17], and repetitive control [18] have been designed.…”

Section: Introductionmentioning

confidence: 99%

Voltage-Sensorless Control Scheme for a Grid Connected Inverter Using Disturbance Observer

Kim

2017

Energies

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A grid connected inverter usually requires voltage and current measurements to control the active and reactive powers as well as the inverter output currents. While voltage sensors are essential to obtain reliable information on the phase angle, these additional components certainly increase the production costs and complexity. In this paper, a voltage-sensorless control scheme for a grid connected inverter using a disturbance observer (DOB) is presented. The grid voltages are estimated by DOB in the stationary reference frame using the current measurements and reference signals. Even though the DOB estimates the grid voltages with reasonable accuracy in the presence of the uncertainty such as the unbalanced condition and harmonic distortion, the resultant waveform shows a phase lag depending on the estimation bandwidth. To overcome this limitation, a phase lead compensation is introduced. By using these techniques, the phase angle of grid voltages can be completely restored even if the phase angle of grid is initially unknown. The proposed scheme is simple and straightforward. In addition, it does not require any additional hardware. The feasibility of the proposed voltage-sensorless control scheme is demonstrated through simulations and experiments using 2 kVA prototype inverter.

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“…Other approaches to eliminate the harmonics from inverter current use nonlinear control techniques such as the sliding mode control (SMC) [12], predictive control [13], or repetitive control [14]. These control strategies are often referred as non-selective method since the controllers work in wide range of frequency, in contrast to the selective method that only regulates the harmonics in some specified orders.…”

Section: Introductionmentioning

confidence: 99%

An Improved Current Control Strategy for a Grid-Connected Inverter under Distorted Grid Conditions

Lai

Kim

2016

Energies

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This paper presents an improved current control strategy for a three-phase grid-connected inverter under distorted grid conditions. The main challenge associated with the grid-connected inverter in distributed generation (DG) systems is to maintain the harmonic contents in output current below the specified values even when the grid is subject to uncertain disturbances such as harmonic distortion. To overcome such a challenge, an improved current control scheme is proposed for a grid-connected inverter, in which the fundamental and harmonic currents are independently controlled by a proportional-integral (PI) decoupling controller and a predictive basis controller, respectively. The controller design approach is based on the model decomposition method, where the measured inverter currents and grid voltages are divided into the fundamental and harmonic components by means of moving average filters (MAFs). Moreover, to detect the angular displacement and angular frequency with better accuracy, even in the presence of the grid disturbance, the MAF is also introduced to implement an enhanced phase-lock loop (PLL) structure. Theoretical analyses as well as comparative simulation results demonstrate that the proposed control scheme can effectively compensate the uncertainties caused by the grid voltages with fast transient response. To validate the feasibility of the proposed scheme, the whole control algorithms are implemented on 2 kVA three-phase grid-connected inverter system using 32-bit floating-point DSP TMS320F28335. As a result, the proposed scheme is an attractive way to control a grid-connected inverter under adverse grid conditions.

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Robust Predictive Control of Grid-Tied Converters Based on Direct Power Control

Cited by 72 publications

References 26 publications

Análisis comparativo del control predictivo de corriente en convertidores VSI empleados en la conexión a red de energías renovables

Análisis comparativo del control predictivo de corriente en convertidores VSI empleados en la conexión a red de energías renovables

Voltage-Sensorless Control Scheme for a Grid Connected Inverter Using Disturbance Observer

An Improved Current Control Strategy for a Grid-Connected Inverter under Distorted Grid Conditions

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