基于等值风机模型的海上风电送出系统工频过电压分析  

Analysis of Industrial Frequency Overvoltage in Offshore Wind Power Delivery System Based on Equivalent Wind Turbine Modeling

作　　者：成天乐 蔡仁旺 CHENG Tian-le;CAI Ren-wang(China Electricity Construction Group Hainan Electric Power Design&Research Institute Co.,Haikou 571100,China)

机构地区：[1]中国电建集团海南电力设计研究院有限公司,海南海口571100

出　　处：《山东工业技术》2024年第1期81-87,共7页Journal of Shandong Industrial Technology

摘　　要：海上风电送出系统工频过电压问题影响着风电外送及海缆输电能力。为解决上述问题,本文首先阐述了海上风电送出系统工频过电压产生机理,在PSCAD软件中搭建电网-海缆-海上风电场的送出系统模型,基于设备分群及等值算法进行风机等值模拟。针对容升效应、不对称接地故障、带故障甩负荷等三种产生暂时工频过电压的主要原因,进行仿真计算。计算结果显示,海缆中部发生单相接地甩负荷时产生的工频过电压最严重。通过在仿真计算改变海缆参数,进一步明确了海缆长度、导体层厚度、绝缘层厚度对工频过电压的影响,提出了关于降低暂时工频过电压的有效方法。The problem of industrial frequency over-voltage in offshore wind power delivery system affects the ability of wind power delivery and cable transmission.In order to solve the above problems,this paper firstly describes the mechanism of IF overvoltage generation in offshore wind power delivery system,builds a grid-sea cable-offshore wind farm delivery system model by using PSCAD,and carries out wind turbine equivalence simulation based on the equipment subgroup and equivalence algorithm.Simulation calculations are carried out for the three main causes of temporary IF overvoltage generation,such as capacitive rise effect,asymmetrical ground fault and load shedding with fault.The calculation results show that the most serious IF overvoltage is generated when single-phase grounding load shedding occurs in the middle of the cable.By changing the parameters of the submarine cable in the simulation calculation,the effects of cable length,conductor layer thickness and insulation layer thickness on the IF overvoltage are further clarified,and an effective method on the reduction of temporary IF overvoltage is proposed.

关 键 词：等值风机模型 海上风电场 工频过电压 

分 类 号：TP406[自动化与计算机技术]