Three-Phase Observer-based Low Distortion Grid Current Controller Using an LCL Output Filter

Bolsens, B.; Brabandere, K. De; Keybus, Jeroen Van den; Driesen, Johan; Belmans, Ronnie

doi:10.1109/pesc.2005.1581860

Cited by 14 publications

(14 citation statements)

References 13 publications

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“…Theorem 1: If the PWM inverter scheme shown in (12) is controlled by the three-part ATSMC system described by (16)- (18) with the adaptive observation design shown in (19), then the stability of the ATSMC system for the voltage control of the PWM inverter can be guaranteed…”

Section: (T)mentioning

confidence: 99%

“…The performance is evaluated by the total harmonic distortion (THD), the transient response, and the efficiency. Thus, much attention has been paid to the closed-loop regulation of PWM inverters to achieve good dynamic response under different types of loads in the past decade, e.g., linear control [18], observer for grid current control [19], Lyapunov-based control [20], sliding-mode control (SMC) [21], etc. Variable structure control with sliding mode, or SMC, is one of the effective nonlinear robust control approaches since it provides system dynamics with an invariance property to uncertainties once the system dynamics are controlled in the sliding mode [20]- [23].…”

mentioning

confidence: 99%

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High-Performance Stand-Alone Photovoltaic Generation System

Wai

Wang

Lin

2008

IEEE Trans. Ind. Electron.

401

138

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Abstract-This study develops a high-performance stand-alone photovoltaic (PV) generation system. To make the PV generation system more flexible and expandable, the backstage power circuit is composed of a high step-up converter and a pulsewidthmodulation (PWM) inverter. In the dc-dc power conversion, the high step-up converter is introduced to improve the conversion efficiency in conventional boost converters to allow the parallel operation of low-voltage PV arrays, and to decouple and simplify the control design of the PWM inverter. Moreover, an adaptive total sliding-mode control system is designed for the voltage control of the PWM inverter to maintain a sinusoidal output voltage with lower total harmonic distortion and less variation under various output loads. In addition, an active sun tracking scheme without any light sensors is investigated to make the PV modules face the sun directly for capturing the maximum irradiation and promoting system efficiency. Experimental results are given to verify the validity and reliability of the high step-up converter, the PWM inverter control, and the active sun tracker for the high-performance stand-alone PV generation system. Index Terms-Active sun tracking scheme, adaptive total sliding-mode control (ATSMC), high step-up converter, photovoltaic (PV) generation system, pulsewidth-modulation (PWM) inverter.

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Section: (T)mentioning

confidence: 99%

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confidence: 99%

High-Performance Stand-Alone Photovoltaic Generation System

Wai

Wang

Lin

2008

IEEE Trans. Ind. Electron.

401

138

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“…This method was further analyzed in [8] in the z-domain. In [9] and [10], instead of a leadlag compensator, the capacitor voltage was fed back to the voltage command through a high-pass filter. A more complex approach, using both a proportional feedback of the capacitor voltage with its lower frequency component and a lead-lag feedback with its high frequency component, was presented in [11].…”

Section: Introductionmentioning

confidence: 99%

“…Another important work in this area was done in [18] by introducing the concept of a "virtual resistor", in which the differential of the capacitor current was fed back to the reference of the converter-side current to simulate a real damping resistor. Unlike these single state feedback methods, complete state information was used in [19] and [20] for current control. All of these methods require extra sensors to measure additional states in order to achieve the necessary damping, which increases hardware costs and reduces system reliability.…”

Section: Introductionmentioning

confidence: 99%

“…All of these methods require extra sensors to measure additional states in order to achieve the necessary damping, which increases hardware costs and reduces system reliability. In order to overcome these drawbacks, sensorless approaches were proposed in [9] and [21], in which the required states were estimated instead of being measured. However, the control complexity of these methods was high.…”

Section: Introductionmentioning

confidence: 99%

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Active Damping Method Using Grid-Side Current Feedback for Active Power Filters with LCL Filters

Tang¹,

Li²,

Kang³

2011

Journal of Power Electronics

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LCL filters installed at converter outputs offer a higher harmonic attenuation than L filters. However, as a three order resonant circuit, it is difficult to stabilize and has a risk of oscillating with the power grid. Therefore, careful design is required to damp LCL resonance. Compared to a passive damping method, an active damping method is a more attractive solution for this problem, since it avoids extra power losses. In this paper, the damping capabilities of capacitor current, capacitor voltage, and grid-side current feedback methods, are analyzed under the discrete-time state-space model. Theoretical analysis shows that the grid-side current feedback method is more suitable for use in active power filters, because it can damp LCL resonance more effectively than the other two methods when the ratio of the resonance and the control frequency is between 0.225 and 0.325. Furthermore, since there is no need for extra sensors for additional states measurements, this method provides a cost-efficient solution. To support the theoretical analysis, the proposed method is tested on a 7-kVA single-phase shunt active power filter.

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