不同无功控制方式下光伏并网的影响及应对策略
作者:梅文明1, 李偲1, 杨立滨2, 李春来2, 郗文康1, Saif Mubaarak Abdulrahman Abd1, 刘文健1, 吉平2, 张鑫2, 李美成1 作者单位:1. 华北电力大学可再生能源学院 新能源电力系统国家重点实验室, 北京 102206;
2. 国网青海省电力公司电力科学研究院, 青海 西宁 810008 发布时间:2018-09-27 15:48:15 点击数:77

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关键词:光伏发电系统;无功控制方式;光照强度扰动;功率特性
摘要:

为解决由于光照强度等扰动因素产生的有功出力波动、并网点电压越限、保护动作投切频繁等问题,该文对光伏系统并网时的无功和电压管理策略进行研究。对比目前光伏电站中普遍运用的定功率因数与定电压两种无功控制方式,并利用Matlab对并网光伏发电系统进行建模,研究光照强度扰动下不同无功控制方式对功率特性的影响规律,证明定电压控制方式在电压支撑能力与系统稳定性方面优于恒功率因数控制方式。最后通过青海地区的光伏并网实例进行相关验证并提出应对策略,通过安装SVG等动态无功补偿装置可以提高系统动态调节能力。该研究可为解决大规模光伏并网带来的实际问题提供一定理论和实证参考。

Influence of grid connection and countermeasures in different photovoltaic reactive power control methods

MEI Wenming1, LI Cai1, YANG Libin2, LI Chunlai2, XI Wenkang1, SAIF Mubaarak Abdulrahman Abd1, LIU Wenjian1, JI Ping2, ZHANG Xin2, LI Meicheng1

1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of Renewable Energy, North China Electric Power University, Beijing 102206, China;
2. State Grid Qinghai Electric Power Company Electric Power Research Institute, Xining 810008, China

Abstract: In order to solve the problems of active power fluctuation due to disturbance factors such as illumination intensity, the limit of the grid voltage, and the frequent switching of protection actions, it is necessary to study the reactive power and voltage management strategies when the photovoltaic system is connected to the grid. The article compares the two methods of the fixed power factor control method and the constant voltage control method, which are commonly used in photovoltaic power plants, and uses Matlab to model the grid-connected system of photovoltaic power generation system. The influence of different reactive power control modes on the power characteristics under the intensity disturbance is studied. It is proves that the constant voltage control mode is superior to the constant power factor control method in terms of voltage support capability and system stability. Finally, through the example of photovoltaic grid-connected in Qinghai, the related verification is carried out, and the countermeasure strategy is proposed that the dynamic reactive power compensation device such as SVG can be installed to improve the dynamic adjustment capability of the system. This research can provide a theoretical and empirical reference for solving the practical problems brought by large-scale photovoltaic grid connection.

Keywords: photovoltaic power generation system;reactive power control method;light intensity disturbance;power characteristics

2018, 44(9): 1-8  收稿日期: 2018-06-05;收到修改稿日期: 2018-07-14

基金项目: 国网青海省电力公司科技项目(522807160015);北京节能与电力技术开发基金会项目(J2017001)

作者简介: 梅文明(1987-),男,浙江金华市人,高级工程师,主要从事新能源技术研究工作

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