基于变尺度滤波的含分布式风电直流线路监测
摘要:分布式风电经换流器接入直流线路后会产生大量的谐波，为解决谐波干扰的影响同时完善直流线路快速与可靠监测的协调关系，提出一种基于变尺度滤波特性的以阻抗为目标的监测方法。该方法根据系统安全性要求对含谐波的电气量进行不同时长的积分监测处理，以利于后续保护，采用较短积分时间窗，兼顾谐波特性，基于较小阻抗识别严重状况，设置较高定值用于监测发现不正常状态；采用较长积分时间窗，强化谐波影响，监测系统故障，而且通过方向判别和系数整定解决了较长积分时间窗时面临的助增电流的影响。利用PSCAD仿真软件在不同系统状态下进行验证，结果表明该方案能迅速识别区内故障，当面临严重谐波影响时，也可规避干扰，具备准确判别系统各种运行状况的能力，比传统阻抗保护更适用于直流线路监测，满足工程要求。
Abstract：A large number of harmonics will be generated after distributed wind power is connected to the DC line through the converter. In order to solve the influence of harmonic interference and improve the fast and reliable monitoring of DC lines, an impedance-targeted monitoring method based on variable-scale filtering characteristics is proposed. According to the system safety requirements, the method performs integral monitoring and processing methods for the electrical quantities containing harmonics for different periods of time to facilitate subsequent protection. A shorter integral time window is adopted, taking into account the characteristics of harmonics, and identifying serious conditions based on smaller impedances. The high setting value is used to monitor the abnormal state of signaling. A longer integration time window is used to strengthen the influence of harmonics and monitor system faults, and the influence of the auxiliary current faced by the longer integration time window is solved through direction discrimination and coefficient setting. Using PSCAD simulation software to verify under different system conditions, the results show that the scheme can quickly identify faults in the area, and can avoid interference when faced with severe harmonic influence, and has the ability to accurately judge various operating conditions of the system, which is better than traditional impedance. The protection is more suitable for DC line monitoring to meet engineering requirements.
标题：基于变尺度滤波的含分布式风电直流线路监测
title:Monitoring of DC Lines with Distributed Wind Power Based on Variable Scale Filtering
作者：徐彦,夏经德,罗金玉,邵文权,苗思雨,杨秀川
authors:XU Yan,XIA Jingde,LUO Jinyu,SHAO Wenquan,MIAO Siyu,YANG Xiuchuan
关键词：分布式风力发电,直流线路监测,变尺度特性,阻抗监测,助增电流,
keywords:distributed wind power,DC transmission lines,variable scale characteristics,impedance monitoring,auxiliary current,
发表日期：2022-10-25
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