变功率跟踪轨迹的光伏并网低电压穿越策略

发布时间：2018-01-17 15:00

本文关键词：变功率跟踪轨迹的光伏并网低电压穿越策略　出处：《电力自动化设备》2017年08期 　论文类型：期刊论文

【摘要】：提出了一种新型的变功率跟踪轨迹的低电压穿越控制策略。通过电压跌落幅度的前馈控制对功率跟踪轨迹进行调节,实时改变光伏电池端电压,进而快速有效地控制光伏电池功率的输出,实现逆变器两侧功率的平衡;通过与并网逆变器的协同控制,保证逆变器并网输出电流在不越限的前提下,为电网提供尽可能多的有功功率和无功功率,最大限度地支持电网电压的恢复,实现了光伏并网系统的零电压穿越。通过在不同光照强度和温度条件下对多种场景的仿真模拟,验证了所提控制策略的有效性。与传统控制策略相比,采用该策略不需要添加额外的设备,不仅实现了系统的安全、稳定运行,而且降低了光伏发电系统的成本,更具实用性。
[Abstract]:A new low voltage traversal control strategy with variable power tracking trajectory is proposed. The power tracking trajectory is adjusted by feedforward control of voltage drop amplitude, and the terminal voltage of photovoltaic cell is changed in real time. Then the output of photovoltaic cell power is controlled quickly and effectively, and the power balance of both sides of inverter is realized. Through the cooperative control with grid-connected inverter, the output current of grid-connected inverter is guaranteed to provide as much active and reactive power as possible to the power grid without exceeding the limit, and to support the restoration of grid voltage to the maximum extent. The zero-voltage traversing of photovoltaic grid-connected system is realized. The effectiveness of the proposed control strategy is verified by the simulation of various scenarios under different illumination intensity and temperature, which is compared with the traditional control strategy. This strategy does not need to add additional equipment, which not only realizes the security and stability of the system, but also reduces the cost of photovoltaic power generation system, and is more practical.
【作者单位】：华北电力大学电气与电子工程学院;
【基金】：国家高技术研究发展计划(863计划)资助项目(2015-AA050603) 河北省科技计划项目(15214307D) 国家电网公司科技项目(SGTYHT/14-JS-188)~~
【分类号】：TM615
【正文快照】： 0引言随着光伏并网规模的不断增大,光伏发电系统的安全稳定运行对电网的影响已不容忽视。当电网发生短时故障时,机组的大规模脱网会严重影响电网电压和频率的稳定性,威胁电网的安全、稳定运行,甚至可能使局部电网崩溃,引起较大面积供电中断,因此电网要求光伏发电机组像传统常

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