高精度光伏并网系统在动态快速太阳辐射波动下的故障分析

2017 IEEE Electrical Power and Energy Conference (EPEC) Pub Date : 2017-10-01 DOI:10.1109/EPEC.2017.8286147

Browh Serge Tekpeti, X. Kang, M. Kheshti

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引用次数: 2

摘要

可再生能源综合系统的保护问题需要进行适当的故障分析研究。本文在模拟太阳辐射波动的基础上，讨论了精确的6.5 kV直流光伏并网系统的情况。具体控制策略为光伏侧控制和逆变侧控制。采用同步旋转框架(SRF)方法设计了一种电流控制策略，实现了对三相电压源逆变器(VSI)的park变换控制。最大功率点跟踪(MPPT)、电压控制、锁相环(PLL)、正弦脉宽调制(SPWM)、LCL滤波器和脉宽调制(PWM)技术在基于PSCAD软件的仿真中实现。电网有110千伏和100毫伏额定功率，通过两个升压三角星变压器利用输电线路与6.5千伏光伏电站相连。分析了高电平、低电平、短时间和动态辐照波动时的对称和不对称故障，讨论了相关光伏系统变量波形。这些结果可能需要进一步研究高PV穿透系统的保护问题和相关问题，这些问题受到不可预测的太阳辐射的影响。

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Fault analysis of accurate PV connected system against dynamic fast solar radiation fluctuation

Renewable energies integrated systems protection issues need proper fault analysis investigation. Based on simulated solar radiation fluctuation the case of accurate 6.5 kV dc photovoltaic (PV) connected system is discussed in this paper. The detailed control strategy is PV side control and inverter side control. The synchronous rotating frame (SRF) method is applied to design a current control strategy to control three-phase voltage source inverter (VSI) using park transform. Maximum power point tracking (MPPT), voltage control, phase locked loop (PLL), sinusoidal pulse width modulation (SPWM), LCL filters, and pulse width modulation (PWM) techniques are implemented in PSCAD software based simulation. The grid has 110 kV and 100 MVA power rating connected to the 6.5 kV PV farm through two step-up delta-star transformers making use of transmission lines. Symmetrical and asymmetrical faults are analyzed during high and low levels short time and dynamic irradiation fluctuation to discuss relevant PV system variables waveforms. These results could be needed to further investigate protection problems and related issues in high PV penetration systems suffering from unpredictable nature of solar radiation.

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2017 IEEE Electrical Power and Energy Conference (EPEC)

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