风电外送电力系统暂态稳定性分析及提升策略  

Transient Stability Analysis and Enhancement Strategy of Wind Power Sending Power System

作　　者：严干贵[1] 岳霖 张皓程 郭富 杨德健 穆钢[1] YAN Gangui;YUE Lin;ZHANG Haocheng;GUO Fu;YANG Dejian;MU Gang(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education(Northeast Electric Power University),Jilin 132012,Jilin Province,China)

机构地区：[1]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林省吉林市132012

出　　处：《电网技术》2024年第12期4826-4832,I0004,I0003,共9页Power System Technology

摘　　要：风电外送电力系统功率输出特性由风电变流器及其控制系统主导,大扰动下易导致系统运行状态越限脱网失稳,风电外送电力系统暂态稳定分析面临困境。基于风电变流器运行控制原理,分析了风电外送系统输出功率、并网点电压跌落深度及直流侧电容电压交互耦合机理,提出故障期间由不平衡功率产生的冲击能量表征方法,提出基于超级电容器抑制直流电容电压越限的风电外送系统暂态稳定性提升策略,并给出了超级电容器容量配置方法;基于仿真算例系统,量化分析了以直流电容电压为状态量的风电外送系统暂态特性,仿真验证了所提出的风电外送系统暂态稳定提升策略的有效性。The power output characteristics of the wind power transmission system are dominated by the wind power converters and their control systems.Under large disturbances,they easily lead to over-limit operation,grid separation,and instability.The transient stability analysis of the wind power transmission system faces challenges.Based on the operation and control principles of wind power converters,this paper analyzes the interaction coupling mechanism among the output power of the wind power transmission system,the depth of voltage sag at the grid connection point,and the DC-side capacitor voltage.An imbalance power-generated impact energy characterization method during fault periods is proposed.Based on this,a transient stability improvement strategy for wind power transmission systems with DC-side capacitor voltage limitation and a supercapacitor capacity configuration method is proposed.Based on simulation examples,the transient characteristics of the wind power transmission system with DC-side capacitor voltage as the state variable are quantitatively analyzed,and the effectiveness of the proposed transient stability improvement strategy for wind power transmission systems is verified through simulation.

关 键 词：并网变流器 暂态稳定性 超级电容 不平衡功率 直流电压 

分 类 号：TM721[电气工程—电力系统及自动化]