• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2018, Vol. 39 ›› Issue (7): 48-56.doi: 10.3969/j.issn.1000-7229.2018.07.006

• 基于直流配电网的新能源汇集技术 栏目主持 王毅教授 • 上一篇    下一篇

基于模块化多电平换流器的光伏并网系统低电压穿越技术控制策略

武承杰,付超,范士雄   

  1. 1.新能源电力系统国家重点实验室(华北电力大学),河北省保定市 071003;2.中国电力科学研究院有限公司,北京市 100192
  • 出版日期:2018-07-01
  • 作者简介:武承杰(1995),男,硕士研究生,主要研究方向为新能源发电、电力电子技术与应用; 付超(1979),男,博士,讲师,主要研究方向为新能源发电、电力电子技术与应用; 范士雄(1984),男,博士,高级工程师,研究方向为电力系统自动化、分布式发电技术。
  • 基金资助:
    国家重点研发计划项目(2016YFB0900203)

Control Strategy of Low Voltage Ride Through for Grid-connected PV System Based on Modular Multilevel Converter

WU Chengjie, FU Chao, FAN Shixiong   

  1. 1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Baoding 071003, Hebei Province, China;2. China Electric Power Research Institute, Beijing 100192, China
  • Online:2018-07-01
  • Supported by:
    This work is supported by National Key Research and Development Program of China(No.2016YFB0900203).

摘要: 随着光伏发电在电力系统中的渗透率日益加大,最新并网规则要求光伏并网逆变器具有一定的低电压穿越(low voltage ride through,LVRT)能力。针对基于模块化多电平变流器(modular multilevel converter,MMC)的光伏并网系统,首先,在静止坐标系下建立了系统的数学模型。为保证光伏电场可在电网故障时具备低电压穿越能力,采用一种实现电流正弦及有功恒定的电流控制策略,并提出无功功率参考值的计算方法及并网电流限幅策略。其次,利用准谐振(proportional resonant,PR)控制器,设计出控制环路,实现光伏并网系统的LVRT。最后,在Matlab/Simulink中搭建了仿真模型,验证了控制策略的有效性和正确性。

关键词: 光伏并网系统, 低电压穿越(LVRT), 模块化多电平变流器(MMC), 电流控制策略:无功功率参考值

Abstract: With the increase of the penetration rate of photovoltaic power in the power system, the latest grid-connection rules require that the inverter of photovoltaic system should have the capability of low voltage ride through (LVRT). This paper aims at a grid-connected photovoltaic system based on modular multilevel converter (MMC). Firstly, the mathematical model of the system is established in the stationary coordinate system. In order to ensure that the photovoltaic plant can operate without network disconnection during grid fault, this paper adopts a current control strategy that can achieve constant sine current and constant active power, and proposes a calculation method for reactive power reference value and current limiting strategy. Using a proportional resonant (PR) controller, a control loop is designed to realize the LVRT of a grid-connected photovoltaic system. Finally, a simulation model is built in Matlab/Simulink to verify the validity and correctness of the control strategy used.

Key words: grid-connected photovoltaic inverter, low voltage ride through(LVRT), modular multilevel converter (MMC), current control strategy, reactive power reference

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