Ground-Fault Characteristic Analysis of Grid-Connected Photovoltaic Stations with Neutral Grounding Resistance

Li, Zheng; Lu, Jiping; Ya, Zhu; Wang, Jiang

doi:10.3390/en10111910

Cited by 7 publications

(6 citation statements)

References 26 publications

(22 reference statements)

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“…According to the simultaneous equation of Equations (4) and (6), the DC bus fault component voltage equation is…”

Section: Symmetrical Fault Conditionmentioning

confidence: 99%

“…In [3][4][5][6][7], the characteristics and calculation methods of the steady-state fault current of PV power have been studied without considering its transient fault characteristics, therefore the conclusions 2 of 21 are only applicable to the steady-state short-circuit analysis. In [8], the mathematical model for the fault analysis of inverter interfaced distributed generator (IIDG) has been first established by using single outer voltage loop control strategy, and then the fault analysis method of distribution network including IIDG has been proposed.…”

Section: Introductionmentioning

confidence: 99%

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Research on Theoretical Calculation Methods of Photovoltaic Power Short-Circuit Current and Influencing Factors of Its Fault Characteristics

Liu

Zhang

et al. 2019

Energies

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With the substantial increase in the capacity of grid-connected photovoltaic (PV) power, the adverse effects of its complex fault characteristics on grid relay protection are increasingly highlighted. Based on the introduction of the topology and the control strategy on low-voltage ride through of PV power, a theoretical solution method for solving the fault current of PV power is proposed by taking account of the DC bus voltage fluctuation, and a theoretical calculation model of its transient and steady state is established. The correctness of the theoretical results is verified by the numerical simulation results and low-voltage ride through (LVRT) experiment results. Furthermore, to gain a better understanding of the factors influencing PV power fault characteristics, the effects of several factors including proportional integral (PI) controller parameters, fault voltage sag depth, and PV power load level on PV power fault characteristics are analyzed by using simple variable method. The obtained results can provide a theoretical reference for the control parameter design and protection research of PV power.

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“…According to the simultaneous equation of Equations (4) and (6), the DC bus fault component voltage equation is…”

Section: Symmetrical Fault Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Theoretical Calculation Methods of Photovoltaic Power Short-Circuit Current and Influencing Factors of Its Fault Characteristics

Liu

Zhang

et al. 2019

Energies

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show abstract

“…Existing research on system grounding types is mainly focused on the grounding fault analysis based on different grounding types [19][20][21][22]. In [19], the fault models of a low voltage power system are developed for the system grounding fault analysis, and the variation of fault current with grounding resistance has been acquired based on the system fault analysis.…”

Section: Introductionmentioning

confidence: 99%

“…In [19], the fault models of a low voltage power system are developed for the system grounding fault analysis, and the variation of fault current with grounding resistance has been acquired based on the system fault analysis. A fault-calculation method for a grid-connected PV station is proposed in [20] based on the fault characteristics analysis of the system. In [21], a DC link adjustable resistive type fault current limiter based on fault analysis of converter is proposed to improve fault ride-through capability.…”

Section: Introductionmentioning

confidence: 99%

Grounding Fault Model of Low Voltage Direct Current Supply and Utilization System for Analyzing the System Grounding Fault Characteristics

Liu¹,

Sun²,

Ma³

et al. 2021

Symmetry

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Grounding fault analysis is of vital importance for low voltage direct current (LVDC) supply and utilization systems. However, the existing DC grounding fault model is inappropriate for LVDC supply and utilization system. In order to provide an appropriate assessment model for the DC grounding fault impact on the LVDC supply and utilization system, an LVDC supply and utilization system grounding fault model is proposed in this paper. Firstly, the model is derived by utilizing capacitor current and voltage as the system state variable, which considers the impact of the converter switch state on the topology of the fault circuit. The variation of system state parameters under various fault conditions can be easily obtained by inputting system state data in normal conditions as the initial value. Then, a model solution algorithm for the proposed model is utilized to calculated the maximum fault current, the system maximum fault current with different grounding resistance is simple to acquired based on the solution algorithm. The calculation results demonstrate that grounding resistance and structure of LVDC supply and utilization system have remarkable impacts on the transient current. The effectiveness of the proposed model is verified in PSCAD/EMTDC. The simulation results indicate that the proposed method is appropriate for the system fault analysis under various fault conditions with different grounding resistance and the proposed model can offer theoretical guidance for system fault protection.

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“…A novel relay protection scheme using directional distance components was proposed in [25], [26], but this scheme is only for the phase-to-phase faults. A fault calculation model of the large-scale PVPS is established in [27], which analyzes the ground fault characteristic of the convergence bus and collector lines and their impacts on protection. Given that, a neutral grounding resistance selection scheme is proposed in [28], but no consideration is given to the coordination of protection and LVRT requirements.…”

Section: Introductionmentioning

confidence: 99%

Resistance Selection and Control Strategy Considering the Coordination of Protection Performance and Low Voltage Ride Through of a Large-Scale Photovoltaic Power Station

Zheng

Liu

et al. 2020

IEEE Access

Self Cite

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Neutral grounding through resistance is widely applied in large-scale centralized gridconnected photovoltaic power stations (PVPS), while protection measures, which are supposed to cut off the single-phase grounding fault of the collection system quickly, are required according to the grid code. Analyses on the coordination between protection performances and low voltage ride through (LVRT) are missing in current researches. Hence there could be a risk that large-scale photovoltaic units may disconnect from the grid as a result of a mismatch between the protection and LVRT. In view of the above, this paper makes contributions in two aspects. Firstly, this paper proposes a scheme on neutral point resistance selection, which is to analyze the influences on protection performances by the fault characteristics of the single-phase grounding fault of the PVPS collection system in different test environments, and then to quantify the speed and the selectivity of the zero-sequence current protection performance as assessment indexes, as required in the coordination between protection performances and LVRT, and in the coordination between protection performances of tie lines and collector lines of the collection system, and finally to select neutral point resistance based on the indexes. Secondly, this paper proposes a comprehensive control strategy on the large-scale PVPS, which can effectively improve the assessment indexes mentioned above of the protection under different active power production scenarios. Finally, a simulation will be conducted to verify the correctness and the feasibility of the resistance selection scheme and the control strategy proposed in this paper. INDEX TERMS Large-scale photovoltaic power station, neutral grounding resistance, low voltage ride through control strategy, protection performance index.

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Ground-Fault Characteristic Analysis of Grid-Connected Photovoltaic Stations with Neutral Grounding Resistance

Cited by 7 publications

References 26 publications

Research on Theoretical Calculation Methods of Photovoltaic Power Short-Circuit Current and Influencing Factors of Its Fault Characteristics

Research on Theoretical Calculation Methods of Photovoltaic Power Short-Circuit Current and Influencing Factors of Its Fault Characteristics

Grounding Fault Model of Low Voltage Direct Current Supply and Utilization System for Analyzing the System Grounding Fault Characteristics

Resistance Selection and Control Strategy Considering the Coordination of Protection Performance and Low Voltage Ride Through of a Large-Scale Photovoltaic Power Station

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