Generalized discrete‐time equivalent model for interfacing the grid‐connected photovoltaic system

Shen, Fu; Zhang, Yutao; Qiu, Guibao; Yang, Zhiwen; Li, Shiwei; Yang, Guangbing

doi:10.1049/gtd2.12656

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…The study in [7] provides experimental results of steady-state values, peak values and ingredients, but it has not shown any model or reasons that can explain these characteristics. PV system models for grid short-circuit currents calculation are proposed and studied [8][9][10][11][12][13][14][15][16][17][18]. In these works, short-circuit current contributions of PV systems in a balanced power system are analyzed [10] and PV power plant short-circuit currents calculating methods are proposed considering inverter limits [11].…”

Section: Introductionmentioning

confidence: 99%

A state‐space average model of a three‐level PV inverter for transient short‐circuit currents analysis

Yuan,

Wen,

Zhang

et al. 2024

IET Generation Trans & Dist

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This paper presents a state‐space average model of a three‐level photovoltaic (PV) inverter to understand short‐circuit currents transient characteristics. Analytical solution of the model is also derived. The proposed model is validated with PV system controller hardware in‐loop (HIL) test method. The errors between simulation and HIL tests results under various conditions are evaluated, testifying the validity of the proposed model. With the model and analytical solution, the decaying time constants of sub‐transient and transient processes are derived, which shows that the time constants of a three‐level PV inverter are not fixed and they vary with voltage dips. The analytical expression of short‐circuit currents is also formulated. The findings from this study are essential to short‐circuit current calculations of a power grid with large‐scale PV plants, coordination of power system protections, and grid planning.

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Section: Introductionmentioning

confidence: 99%

A state‐space average model of a three‐level PV inverter for transient short‐circuit currents analysis

Yuan,

Wen,

Zhang

et al. 2024

IET Generation Trans & Dist

View full text Add to dashboard Cite

show abstract

“…The single-phase and three-phase PV frequency-domain Norton equivalent model was established for simulating the PV system partition time-transient simulation [22]. The generalized discrete-time equivalent model uses the interface as the grid-connected PV bridge [23]. The data-driven hybrid equivalent model was established for the dynamic response process of multiple PV plants [24].…”

Section: Introductionmentioning

confidence: 99%

Research on Dynamic Modeling and Parameter Identification of the Grid-Connected PV Power Generation System

et al. 2023

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With the increasing proportion of renewable energy in the new power system, the grid-connected capacity of photovoltaic (PV) units shows an obvious upward trend, but its dynamic behavior under different penetration rates significantly affects the transient stability of the power system, so it is crucial to establish a dynamic model that meets the actual working conditions and select a suitable parameter identification method. Therefore, in this paper, based on the electromechanical transient characteristics of the grid-connected PV power generation system, the corresponding dynamic discrete equivalent model is established, and the simulation platform of the grid-connected PV power generation system is built in MATLAB/Simulink to study the adaptability of the dynamic discrete equivalent model of the grid-connected PV power generation system from the single and multiple scenarios using the ordinary least squares (OLS) and bat algorithm (BA) while comparing the generalization ability of the parameters identified by the two methods to the model. The simulation results show that the generalization ability of the parameters identified by the OLS and BA for the model in the single scenario is better, indicating that the model has good adaptability; the generalization ability of a set of general parameters identified by the BA for the model in the multiple scenarios is better than that of the OLS, indicating that the parameters identified by the BA have better adaptability. In conclusion, the dynamic discrete equivalent model of the grid-connected PV power generation system proposed in this paper can accurately reflect the dynamic characteristics of the grid-connected PV power generation system, and the parameters identified by the BA are more generalized than the OLS.

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Optimal Allocation of Energy Storage Capacity for Microgrid Primary Frequency Modulation

Shen,

Wang,

Shan

et al. 2023

2023 IEEE 7th Conference on Energy Internet and Energy System Integration (EI2)

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Generalized discrete‐time equivalent model for interfacing the grid‐connected photovoltaic system

Cited by 7 publications

References 31 publications

A state‐space average model of a three‐level PV inverter for transient short‐circuit currents analysis

A state‐space average model of a three‐level PV inverter for transient short‐circuit currents analysis

Research on Dynamic Modeling and Parameter Identification of the Grid-Connected PV Power Generation System

Optimal Allocation of Energy Storage Capacity for Microgrid Primary Frequency Modulation

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