Indirect Current Control Method Based on Reference Current Compensation of an LCL-Type Grid-Connected Inverter

Li, Zheng; Yang, Linhang; Yang, Dechang; Peng, Zuwen; Shao, Dashuai; Liu, Jinbao

doi:10.3390/en15030965

Cited by 7 publications

(6 citation statements)

References 32 publications

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“…The system structure diagram is shown in Figure (2). The upper computer is used to establish the simulation model of the system and send the data to the lower computer [6] . FPGA (PWL network simulation system) is responsible for the simulation of the circuit.…”

Section: Design Of Fpga Simulation Systemmentioning

confidence: 99%

“…Figure 2 System structure diagram Figure (2) depicts a piecewise linear network simulation system based on FPGA, including upper computer, lower computer, FPGA (PWL network simulation), I / O interface and controller;The upper computer is used to establish the simulation model of the system and send the data to the lower computer[6] . FPGA (PWL network simulation system) is responsible for the simulation of the circuit.…”

mentioning

confidence: 99%

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Research on a piecewise linear network simulation method based on FPGA

Yang

Meng

et al. 2023

Third International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2023)

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In order to improve the accuracy and speed of simulation, a piecewise linear (PWL) network simulation method based on FPGA is proposed. Through RT-LAB hardware in the loop simulation platform and supporting FPGA development tools, a simulation system based on FPGA is established. The nonlinear element is modeled by PWL approximation method. The system matrix method that accurately supports the characteristics of any PWL element is applied, so that the realtime simulation system can fit the real operating state of the system, and has very good simulation accuracy and simulation results. In order to verify the effectiveness of the system, an energy storage grid connected test system is established by using the PWL network system based on FPGA. The experiment proves the effectiveness of the PWL network simulation based on FPGA.

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Section: Design Of Fpga Simulation Systemmentioning

confidence: 99%

mentioning

confidence: 99%

Research on a piecewise linear network simulation method based on FPGA

Yang

Meng

et al. 2023

Third International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2023)

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“…In recent years, some control strategies without PLL have been proposed to solve the instability problem caused by PLL [12][13][14][15]. In [12], a model predictive direct power control strategy was proposed to optimize the switching frequency of the grid-connected inverter.…”

Section: Introductionmentioning

confidence: 99%

“…A direct power control method is proposed in [14], but its calculation of the command current requires an additional set of coordinate transformations. In [15], a current compensation control strategy without PLL is proposed. The control strategies mentioned above are all applied under strong power grid conditions, ignoring the effect of grid impedance.…”

Section: Introductionmentioning

confidence: 99%

Control and Stability Analysis of the LCL-Type Grid-Connected Converter without Phase-Locked Loop under Weak Grid Conditions

et al. 2022

Self Cite

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The stability and dynamic performance of the grid-connected converter is greatly affected by the coupling between the phase-locked loop (PLL) and the current loop control under weak grid conditions. The traditional control strategies use PLL to obtain the frequency and phase of the grid, which ignore the influence of the PLL and cannot adapt to weak grid conditions. To address this problem, the control and stability of the LCL-Type grid connected converter without PLL under weak grid conditions are studied in-depth in this paper. Firstly, the digital controlled model of the LCL-Type grid-connected converter with capacitor-current feedback active damping is established, and the stability of the system is analyzed. Then, a control strategy without PLL is proposed. The proposed strategy decomposes the grid voltage signal into instantaneous active and instantaneous reactive components through the αβ frame, which can realize the independent control of active and reactive current by simple calculation. The obtained results show that the strategy avoids the influence of the PLL on the inner loop current, and has the advantages of strong stability and anti-interference ability under weak grid conditions. Finally, simulation and experiment results are provided to verify the validity of theoretical analysis.

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“…The papers [19], [20] investigate current limiting control. In [24] interesting theoretical and experimental results for an indirect current control strategy are presented. The papers [21], [22] show very good experimental results, while the paper [11] proposes to use synchronverters This research was supported by the Israeli Ministry of Energy, under grant number 219- 11-128. with current loops to create a multi-terminal HVDC system.…”

Section: Introductionmentioning

confidence: 99%

Improvements to the VSM current controller for better grid performance

Kustanovich¹,

YIN²

2022

Preprint

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<p>Abstract—Output current control is widely used as the inner?most control loop of inverters, in particular virtual synchronous machines (VSM). The realization of this controller is commonly based on a PI controller working in a synchronous reference frame. The controller should mitigate the grid currents distortion and the unsteady amplitudes caused by A/D converter imperfec?tions, measurement errors and processing delays. The elimination of any DC component in the output currents is another relevant demand. The literature indicates that the current controller parameters are usually chosen by experimental tuning. In this paper, we propose a fast current controller design procedure that provides compensation for the processing delays and eliminates the DC components of the grid-side currents. We propose to control also the zero component of the output currents (which helps in an unbalanced grid). We present the performance of the novel features of our current controller through a series of simulations, comparing it to the performance of the same con?troller without the proposed additional features. In addition, we compare our new current controller’s design with one proposed in the literature. The results show that the new current controller leads to a better performance of the VSM in terms of output active power oscillations and stability.</p>

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Indirect Current Control Method Based on Reference Current Compensation of an LCL-Type Grid-Connected Inverter

Cited by 7 publications

References 32 publications

Research on a piecewise linear network simulation method based on FPGA

Research on a piecewise linear network simulation method based on FPGA

Control and Stability Analysis of the LCL-Type Grid-Connected Converter without Phase-Locked Loop under Weak Grid Conditions

Improvements to the VSM current controller for better grid performance

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