直流闭锁暂态过电压对风电外送影响及其抑制措施

高压直流输电系统直流闭锁引起的送端交流母线暂态过电压可能影响送端风火打捆交流系统风电机组的稳定运行。针对该问题,首先分析了直流闭锁引起暂态过电压的主要原因及其对风电机组造成的影响,然后阐述了直流闭锁动态过电压及保护动作过程,并利用由PSCAD中自带示例Cigre_Benchmark改进的双极高压直流输电系统模型仿真分析了直流闭锁的触发方式及其引起暂态过电压的过程机理。通过改进触发直流闭锁的紧急停机策略,减缓直流闭锁的触发过程,改变保护措施的触发顺序,并与安全控制系统配合来抑制送端并网母线的暂态过电压,以此来保证风电机组的稳定运行。基于PSCAD/EMTDC搭建了风火打捆高压直流模型,最后通过算...

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Bibliographic Details
Published in电力系统保护与控制 Vol. 46; no. 5; pp. 99 - 105
Main Author 韩平平;陈凌琦;胡迪;张炎
Format Journal Article
LanguageChinese
Published 安徽省新能源利用与节能重点实验室, 合肥工业大学, 安徽 合肥 230009 01.03.2018
Subjects
直流闭锁;暂态过电压;并网母线;紧急停机策略;风火打捆高压直流输电系统
emergency switch off sequence strategy
并网母线
grid-connected bus
DC block
transient overvoltage
风火打捆高压直流输电系统
暂态过电压
紧急停机策略
直流闭锁
wind-thermal-bundled HVDC system
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Summary:高压直流输电系统直流闭锁引起的送端交流母线暂态过电压可能影响送端风火打捆交流系统风电机组的稳定运行。针对该问题,首先分析了直流闭锁引起暂态过电压的主要原因及其对风电机组造成的影响,然后阐述了直流闭锁动态过电压及保护动作过程,并利用由PSCAD中自带示例Cigre_Benchmark改进的双极高压直流输电系统模型仿真分析了直流闭锁的触发方式及其引起暂态过电压的过程机理。通过改进触发直流闭锁的紧急停机策略,减缓直流闭锁的触发过程,改变保护措施的触发顺序,并与安全控制系统配合来抑制送端并网母线的暂态过电压,以此来保证风电机组的稳定运行。基于PSCAD/EMTDC搭建了风火打捆高压直流模型,最后通过算例仿真证明了所提方法的有效性。该方法对于风火打捆高压直流输电系统的电压稳定性研究具有一定的参考价值。
Bibliography:DC block; transient overvoltage; grid-connected bus; emergency switch off sequence strategy; wind-thermal- bundled HVDC system
HAN Pingping, CHEN Lingqi, HU Di, ZHANG Yan （New Energy Utilization and Energy Saving Laboratory, Hefei University of Technology, Hefei 230009, China）
41-1401/TM
The transient overvoltage of converter side AC bus caused by DC block may influence the stable operation of wind-thermal-bundled AC system wind turbines. To solve this problem, this paper firstly analyzes the main reasons of transient overvoltage caused by DC block and its impact on wind turbines. Then dynamic overvoltage caused by DC block and protection operating process are expounded. Besides, the HVDC system model called Cigre_Benchmark in PSCAD is modified, and the modified model is used to simulate and analyze the trigger mode of DC block and the process mechanism of transient overvoltage. The emergency switch off sequence strategy triggering DC block is improved, the triggering process of DC block is retarded, and the tri
ISSN:1674-3415
DOI:10.7667/PSPC170255