The Dual-Current Control Strategy of Grid-Connected Inverter With <i>LCL</i> Filter

Guan, Yuanpeng; Wang, Yu; Xie, Yunxiang; Liang, Yi; Lin, Anna L.; Wang, Xuemei

doi:10.1109/tpel.2018.2869625

Cited by 64 publications

(26 citation statements)

References 32 publications

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“…So doing, the inverter is current-controlled. Different implementations of the regulators H D2 and H D1 can be found in the literature, such as the P-PI [72], [73], P-H ∞ [74], P-PR [31], [37], DB-PI [75], PR-R [76], hysteresis current control (HCC)-PR [77]. These regulators achieve a sufficiently fast response for the inner i L loop and a high-gain in the lower frequency region for the outer loop, beneficial for protection and reference tracking, respectively.…”

Section: B Double-loop Control Structuresmentioning

confidence: 99%

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

Caldognetto¹

2020

Preprint

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<div><div><div><p>Grid-tied inverters are widely used for interfacing renewable energy sources or storage devices to low-voltage electrical power distribution systems. Lately, a number of different control techniques have been proposed to address the emerging requirements of the smart power system scenario, in terms of both functionalities and performance. This paper reviews the techniques proposed for the implementation of current-controlled or voltage-controlled inverters in microgrids. By referring to a voltage source inverter with LCL output filter, the different control architectures are classified as single-, double-, and triple- loop. Then, the functionalities that are needed or recommended in the grid-connected, islanded, and autonomous operating modes of the grid-tied inverter are identified and their implementation in the different control structures is discussed. To validate the analysis and to better illustrate the merits and limitations of the most effective solutions, six control strategies are finally implemented and experimentally compared on a single-phase, grid-connected inverter setup.</p></div></div></div>

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Section: B Double-loop Control Structuresmentioning

confidence: 99%

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

Caldognetto¹

2020

Preprint

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“…Consequently, the gridside current feedback AD method is selected to realize a virtual resistor in parallel with the filter capacitor. Guan et al [9] proposed a dual-current active damping control strategy based on the feedback of inverter-side and grid-connected currents. Nonetheless, the equivalent virtual impedance to be simulated in series with a filter inductance will decrease the stability margin.…”

Section: Introductionmentioning

confidence: 99%

Design of Discrete-Time Backstepping Sliding- Mode Control for LCL-Type Grid-Connected Inverter

Wang

Wai

2020

IEEE Access

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This study designs a discrete-time backstepping sliding-mode control (DTBSMC) method for an LCL-type grid-connected inverter. Firstly, the dynamic model of a discrete-time three-order system is derived, and a discrete-time backstepping control method cascading with the sliding-mode control theory is designed via Lyapunov stability verification. Moreover, the system state equation is transformed into a special form by using a time-varying mapping for overcoming the difficulty of a non-causal problem. Besides, through the recursively subsystem design for the high-order LCL-type inverter, the asymptotic system stability can be ensured by step-by-step virtual control designs. In addition, the proposed method can combine both the advantages of the backstepping control method and sliding-mode control theory. Therefore, the inverter system can have strong robustness under the condition of a power grid with varied grid impedances. Finally, the effectiveness of the proposed DTBSMC method is verified by numerical simulations and experimental results in comparison with a traditional proportional-resonant (PR) method and a backstepping control method. INDEX TERMS Backstepping, sliding-mode control, discrete-time, non-causal problem, LCL filter, gridconnected inverter.

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“…The Grid-Connected Inverter (GCI) is an important interface unit inserted between renewable energy and the grid [1], where a power filter, such as L, LC, and LCL, is also indispensable to suppress the harmonic current generated by the high frequency switching. Compared with the L and LC filter, the LCL filter is often utilized in industry, owing to its better harmonic attenuation performance and lower cost [2], [3].…”

Section: Introductionmentioning

confidence: 99%

An Optimized Parameter Design Method for Passivity-Based Control in a LCL-Filtered Grid-Connected Inverter

Chen

et al. 2020

IEEE Access

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Nowadays, the Passivity-Based Control (PBC) has been successfully applied to digitally controlled Grid-Connected Inverter (GCI) with LCL filter. As a nonlinear method, the PBC controller has strong robustness against the parameter drift of the LCL filter and the grid impedance, where the parameters of the PBC controller still need to be designed carefully to achieve a good control performance. The existing design methods are based on separating the PBC controller into three control loops. Therefore, the design process is cumbersome, especially for inexperienced engineers, due to the complex structure of the PBC controller. In this paper, an intelligent Particle Swarm Optimization (PSO) algorithm is utilized to simplify the parameters design of the PBC controller, where the difficulty of manual calculations is avoided and the parameters can be more easily and efficiently obtained using MATLAB in offline mode. Furthermore, a Kalman filter observer is adopted to estimate the state variables in the PBC controller, where only the grid-injected current needs to be sampled in the overall GCI system. Simulations and experiments are provided to verify the correctness and effectiveness of the proposed PBC controller design method. INDEX TERMS grid-connected inverter, Kalman filter, LCL filter, passivity-based control, particle swarm optimization.

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The Dual-Current Control Strategy of Grid-Connected Inverter With LCL Filter

Cited by 64 publications

References 32 publications

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

Design of Discrete-Time Backstepping Sliding- Mode Control for LCL-Type Grid-Connected Inverter

An Optimized Parameter Design Method for Passivity-Based Control in a LCL-Filtered Grid-Connected Inverter

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