新能源并网发电系统低电压穿越与孤岛同步检测的无功功率扰动算法  

Reactive Power Perturbation Method for Simultaneous Low Voltage Ride-Through and Islanding Detection of Grid-Tied Renewable Energy Generation Systems

作　　者：马聪[1] 高峰[1] 李瑞生[2] 李献伟[2] 

机构地区：[1]电网智能化调度与控制教育部重点实验室(山东大学),山东省济南市250061 [2]许继集团有限公司,河南省许昌市461000

出　　处：《电网技术》2016年第5期1406-1414,共9页Power System Technology

摘　　要：随着新能源并网发电系统的大量建设与并网,准确、快速地实现低电压穿越与孤岛检测是并网系统的两项重要功能。实际运行时,依据并网准则定义的低电压穿越与孤岛检测的操作时间,并网系统需要能够同步进行低电压穿越运行与孤岛检测,一旦检测到孤岛状态即执行停机操作。但是现有的低电压穿越与孤岛检测方法,在时间和结构上都难以进行简单的组合,无法同时实现低电压穿越与孤岛检测。提出一种由基于双二阶广义积分器的锁相环、功率扰动模块以及孤岛检测模块组成的无功功率扰动方法。该方法控制新能源并网发电系统输出无功电流,同时利用输出的无功功率进行功率扰动,可同时满足低电压穿越运行与孤岛快速检测的要求。最终,仿真结果验证了该方法的有效性与准确性。With increasing construction and grid integration of renewable energy generation in large scale,accurate and rapid low voltage ride through（LVRT） regulation and islanding detection are two important functions of grid-integrated systems.Grid-integrated system should operate LVRT and islanding detection simultaneously based on LVRT operation time and islanding detection defined in grid code in actual operation.Once islanding condition is detected,shut down operation shall be implemented.Existing LVRT and islanding detection methods,however,cannot be combined simply in detection time and structure and cannot achieve LVRT and islanding detection simultaneously.This paper therefore proposes a reactive power perturbation method,consisting of dual second order generalized integrator phase locked loop（PLL）,power perturbation module and islanding detection module.This method can meet requirement of LVRT and islanding detection in parallel by controlling output reactive power of grid-integrated renewable energy systems and utilizing output reactive power to implement power perturbation.Finally,validity and accuracy of the proposed method was verified with simulation results.

关 键 词：功率扰动 低电压穿越 孤岛检测 新能源发电系统 锁相环 

分 类 号：TM615[电气工程—电力系统及自动化]