大规模光伏电站并网的振荡模式分析

发布时间：2018-04-12 17:56

本文选题：光伏电站 + 小信号模型　；参考：《电力自动化设备》2017年08期

【摘要】：随着光伏电站容量的不断增大,其对于电网稳定性的影响也日趋明显。建立了大规模光伏电站并网系统的等值模型,采用特征值法和时域仿真验证其准确性。基于等值模型采用特征值法分析了大规模光伏电站的振荡模式,并研究了光伏逆变器的控制器参数、光伏阵列结构以及交流系统强弱对振荡模式的影响。仿真结果表明:光伏并网系统中主要包含正阻尼的次同步振荡模式和低频振荡模式,其中次同步振荡模式主要受q轴电流PI参数的影响,低频振荡模式主要受外环电压和d轴电流PI参数的影响;光伏阵列结构的变化对系统振荡模式有影响,会使系统中与直流电压相关的模式由非振荡状态变为振荡状态;交流系统变弱会导致振荡模态阻尼减弱,威胁系统的安全稳定运行。时域仿真验证了特征值分析的正确性。
[Abstract]:With the increasing capacity of photovoltaic power station, its influence on power grid stability is becoming more and more obvious.The equivalent model of grid-connected system of large-scale photovoltaic power station is established. The accuracy of the model is verified by eigenvalue method and time-domain simulation.Based on the equivalent model, the oscillation mode of large-scale photovoltaic power station is analyzed by eigenvalue method, and the influence of the controller parameters of photovoltaic inverter, the structure of photovoltaic array and the strength of AC system on the oscillation mode is studied.The simulation results show that the photovoltaic grid-connected system mainly includes positive damping sub-synchronous oscillation mode and low-frequency oscillation mode, in which sub-synchronous oscillation mode is mainly affected by Q axis current Pi parameters.The low frequency oscillation mode is mainly affected by the Pi parameters of the outer ring voltage and the d axis current, and the change of the photovoltaic array structure has an effect on the oscillation mode of the system, which will change the mode related to DC voltage from the non-oscillating state to the oscillating state.The weakening of AC system will lead to the weakening of oscillation mode damping and threaten the safe and stable operation of the system.The time domain simulation verifies the correctness of eigenvalue analysis.
【作者单位】：华北电力大学新能源电力系统国家重点实验室;华北电力大学电气与电子工程学院;
【基金】：国家自然科学基金资助项目(51507064) 中央高校基本科研业务费资助项目(2015MS84)~~
【分类号】：TM615;TM712

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