HR Control Strategy Based on Phase Compensation for LCL Grid-Connected Inverters in Weak Grid

Wu, Jian; Luo, Zhihang; Cui, Yongshuai; Xu, Dianguo

doi:10.1109/repe55559.2022.9949524

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…The efficient transmission and consumption of renewable energy is an urgent problem to be solved in today's power system. Reasonable power system planning is the key to achieving large-scale grid integration of renewable energy [11] . Before the photovoltaic power station is connected to the grid, it is necessary to conduct reasonable grid connection mode research to ensure that the power flow of each bus node and each line maintains a normal level during the power system operation.…”

Section: Three Grid-connected Modes Of Distributed Photovoltaic Acces...mentioning

confidence: 99%

Research on Distributed Photovoltaic Grid-connected Mode Based on PSASP

Wang

Cai

Song

et al. 2023

J. Phys.: Conf. Ser.

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With the continuous implementation of the carbon peak and carbon neutrality, a large number of distributed solar power stations have been integrated into the grid, which has caused a strong impact on the safe and stable operation of the traditional power system. Based on this, the grid-connected mode of distributed solar power stations is studied, and three types of grid connection are proposed. Mode A is merged into the 66 kV bus side of the 220 kV substation through the 66 kV dedicated line; Mode B is merged into the 66 kV bus side of the 66 kV substation through the 66 kV dedicated line; Mode C is T-connected to the 66 kV transmission line through 66 kV dedicated line. By using a power system analysis software package (PSASP), we can build a model of a certain regional power grid and study the effects of the above three grid-connected modes on system voltage stability, short-circuit current, and network loss. The study shows that the three modes are all feasible. Mode A has the smallest change in voltage quality and short-circuit current of the grid-connected substation and has the smallest network loss of the three modes.

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Section: Three Grid-connected Modes Of Distributed Photovoltaic Acces...mentioning

confidence: 99%

Research on Distributed Photovoltaic Grid-connected Mode Based on PSASP

Wang

Cai

Song

et al. 2023

J. Phys.: Conf. Ser.

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show abstract

“…However, these methods inevitably weaken the grid voltage disturbance suppression and thus deteriorating the steady‐state quality of the grid current. Studies in [21] added phase compensation in the harmonic quasi‐resonant controller, improving the impedance of low‐frequency characteristics without affecting the resonant gain, thus balancing robustness and disturbance suppression ability. In the literature [22], by adding a current feedback loop, an input compensation strategy for the T/4 delayed PLL has been proposed to attenuate the effect of dynamic coupling between the grid impedance and the PLL. Re‐adjustment of PLL characteristics: The literature [23, 24] re‐designed PLL bandwidth using phase margin and short‐circuit ratio (SCR) as constraints, which improved the system stability but sacrificed the current dynamic tracking performance.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

ADRC‐based symmetric phase‐locked loop structure for improving low‐frequency stability of grid‐connected inverters

Zhu,

Ohyama

2024

IET Renewable Power Gen

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With a small short‐circuit ratio (SCR), the grid‐connected inverter is prone to low‐frequency oscillation instability due to the dynamic interaction between the phase‐locked loop (PLL) and the weak grid. To this end, an active‐disturbance‐rejection‐controller‐based symmetric PLL (ADRC‐based SyPLL) is proposed in this article to simplify the system modelling and improve the low‐frequency stability of the inverter system. Specifically, the ADRC technique is applied to phase‐regulated feedback control of a PLL, where an extended state observer (ESO) is used to estimate the lumped disturbance of the controlled system. A control loop symmetric to the q‐axis is further designed on the d‐axis of the PLL, and the d‐axis information is then added at the reference generation side to eliminate the coupled frequency term in the small‐signal model. A simple and accurate single‐input single‐output (SISO) model is thus obtained. The impedance stability analysis for grid‐connected inverters shows that the proposed ADRC‐based SyPLL can significantly improve the low‐frequency stability margin of the system compared with the conventional PI‐regulated PLL. Finally, the experimental results validate the effectiveness and superiority of the proposed method.

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HR Control Strategy Based on Phase Compensation for LCL Grid-Connected Inverters in Weak Grid

Cited by 2 publications

References 8 publications

Research on Distributed Photovoltaic Grid-connected Mode Based on PSASP

Research on Distributed Photovoltaic Grid-connected Mode Based on PSASP

ADRC‐based symmetric phase‐locked loop structure for improving low‐frequency stability of grid‐connected inverters

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