Control and Protection Coordination Based Identification Strategy of DC Fault for Photovoltaic DC Boosting Integration System

被引：0

作者：

Jia K. ^{[1
]}

Xuan Z. ^{[2
]}

Chen J. ^{[1
]}

Zhao Q. ^{[1
]}

Feng T. ^{[1
]}

Bi T. ^{[1
]}

机构：

[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing

[2] Electric Power Research Institute of State Grid Beijing Electric Power Company, Beijing

来源：

Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2019年 / 43卷 / 24期

基金：

国家重点研发计划;

关键词：

Coordination of control and protection; DC boosting integration; DC fault detection; Photovoltaic (PV) plant;

D O I：

10.7500/AEPS20181025006

中图分类号：

学科分类号：

摘要：

Due to the special series connection form of the DC transformers in photovoltaic (PV) DC boosting integration system, the voltage and current of the collecting port of DC transformer will fluctuate with the PV panel outputs in normal operation. When the high-impedance fault occurs and the system output is very low, and fault characteristics are similar to the transient process of normal operating output fluctuations. So the system fault characteristics are unobvious and the protection configured on the DC transformer port is difficult to identify the fault effectively. A DC fault identification strategy based on the coordinated control and protection is designed to solve the above problems. On the basis of analyzing the harmonic generation mechanism of DC transformer, the harmonic disturbance is generated by changing its carrier frequency, and working condition of system fault can be quickly identified according to the difference of the harmonic flow paths. The simulation results of PSCAD show that the proposed method can reliably determine the DC fault of integration system only by using the local measurement information of the inverters, which is not affected by PV outputs. © 2019 Automation of Electric Power Systems Press.

引用

页码：134 / 141and164

共 24 条

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