摘要
高比例新能源和电力电子设备的接入使得当前电网对动态电压的变化更加敏感。将单调控制系统理论应用于动态电压问题,提出输入-输出单调的判定条件,指出动态电压过程中存在单调控制特性。借助该理论论证不同规模交流系统中低压减载控制与动态电压间的单调特性,并在单机系统与区域电网中进行验证。对于新能源接入后的电力系统,简化其故障恢复期间的动态电压模型,在论证其单调控制特性的基础上,对潜在的反复低电压穿越问题进行预判,并在实际新能源送端电网中对该问题进行仿真,验证了所提改进策略的有效性。
The connection of high proportion of renewable energy and power electronic equipments makes the current power grid more sensitive to the change of dynamic voltage.The monotone control system theory is applied to the dynamic voltage problem,the determinant condition for input-output monotone is proposed,and it is point out that the monotone control characteristics is existed in dynamic voltage process.With the help of this theory,the monotone characteristics between low voltage load shedding control and dynamic voltage in different scale AC systems are demonstrated,which is verified in single system and regional power grid.For the power system connected with renewable energy,its dynamic voltage model during fault recovery period is simplified.On the basis of demonstrating its monotone control characteristics,the potential repeated low voltage ride through problem is predicted,and the problem is simulated in an actual sending end power grid with renewable energies,which verifies the effectiveness of the proposed improvement strategy.
作者
张谦
陈民权
郝文清
李振垚
甘德强
范翔
ZHANG Qian;CHEN Minquan;HAO Wenqing;LI Zhenyao;GAN Deqiang;FAN Xiang(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;Power Dispatching Control Center of Guizhou Power Grid Co.,Ltd.,Guiyang 550002,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2022年第6期161-169,共9页
Electric Power Automation Equipment
基金
国家重点研发计划智能电网技术与装备重点专项(2016YFB0900605)
国家电网公司总部科技项目(5100-202040007A-0-0-00)。
关键词
电力系统
动态电压
单调控制
低压减载
预防控制
故障恢复
electric power systems
dynamic voltage
monotone control
low voltage load shedding
prevention control
fault recovery
