制约葛南直流大负荷精准控制的关键因素  

Key factors restricting accurate control of high load in Ge-Nan direct current project

作　　者：付广旭 王永平[1] 罗金辉 FU Guangxu;WANG Yongping;LUO Jinhui(NR Electric Co.,Ltd,Nanjing 211102)

机构地区：[1]南京南瑞继保电气有限公司,南京211102

出　　处：《电气技术》2024年第2期79-84,共6页Electrical Engineering

摘　　要：2023年,葛南直流工程进行了控保及换流阀改造。试运行期间,系统出现过负荷限制电流导致功率未达到1 160MW的异常情况。为此,首先对改造后直流线路在大负荷情况下运行时送端直流电压无法达到额定电压的原因进行分析,并在此基础上分析制约大负荷精准控制的关键因素,包括交流电压低或换流变档位低、控制中设定的相对直流感性压降值高于实际值、熄弧角运行在额定参考值之上;然后简要分析直流电压的测量误差、直流线路电阻及换流阀正向压降的偏差对直流功率精准控制的影响;最后,提出具有针对性的解决措施并通过实时数字仿真平台进行验证。In 2023,Ge-Nan DC project carried out the renovation of control,protection and converter valves.During the trial operation,there was an abnormal situation where the power did not reach 1160MW due to overload limiting current.Therefore,the reason why the DC voltage at the sending end cannot reach the rated voltage during high load operation after the renovation of DC line is analyzed firstly.On this basis,the key factors restricting accurate control of high load are analyzed,including low AC voltage or low converter gear,higher relative DC inductive voltage drop set in the control than the actual value,and extinction angle operating above the rated reference value.Subsequently,a brief analysis is conducted on the impact of measurement error of DC voltage,deviation of DC line resistance and forward pressure drop of converter valve on accurate control of DC power.Finally,targeted solutions are proposed and validated through the real-time digital simulation platform.

关 键 词：直流输电 精准控制 过负荷限制 大负荷 线路改造 

分 类 号：TM721.1[电气工程—电力系统及自动化]