宁东直流近区新能源诱发次同步振荡风险评估  

Risk assessment on new energy induced sub-synchronous oscillation in eastern Ningxia DC nearby area of Ningxia power grid

作　　者：任勇[1] 黄永宁[1] 高峰[1] 

机构地区：[1]国网宁夏电力公司电力科学研究院,宁夏银川750011

出　　处：《宁夏电力》2016年第1期53-58,共6页Ningxia Electric Power

摘　　要：由于配套大容量的火电机组和装机容量较大的新能源发电并网机组,宁夏电网宁东直流近区存在诱发次同步振荡风险问题,本文分析和研究了宁夏电网宁东直流近区相关站点的PMU监测数据,对宁东直流近区因新能源发电诱发火电机组次同步振荡风险评估。结果表明:虽然间谐波引起次同步振荡的第一种作用形式,在新能源发电较小出力工况下,宁东直流近区火电机组发生次同步振荡的风险较低;但是,间谐波激发次同步振荡的第二种作用形式普遍存在,其对发电机轴系的危害甚至高于三相对地故障,因此,需进一步加强各种工况下次同步谐波与振荡的监测、研究及防范工作,以保障电网安全可靠运行。Because of matching large capacity coal-fired units,and larger installed capacity of new energy generating units in eastern Ningxia DC nearby area of Ningxia power grid,it exists the risk of inducing sub-synchronous oscillation. by analyzing and studing the PMU (phasor measurement unit) monitoring data from related substations of eastern Ningxia DC nearby area,conducts risk assess ment for new energy generation inducing sub-synchronous oscillation of coal-fired units in eastern Ningxia DC nearby area of Ningxia power grid. The result shows that:even though under the condition of less output of new energy generation and the first efficient form of interharmonics caused sub-synchronous oscillation,appearing the risk of sub-synchronous oscillation is lower at coal-fired units in eastern Ningxia DC nearby area of Ningxia power grid,but the second efficient form of interharmonics caused sub-synchronous oscillation is common existence,the perniciousness for shafting of generator is even higher than the three-phase ground fault,so should fur ther strengthen the monitoring,study and precaution for sub-synchronous harmonic and oscillation under various operating conditions,ensure power grid safe and reliable operation.

关 键 词：电力系统稳定 次同步振荡 PMU数据 风险评估 

分 类 号：TM714[电气工程—电力系统及自动化]