论文部分内容阅读
随着近几年来大量高压直流输电工程接入交流系统,给交直流混联电网带来重要影响,直流系统的运行状况,尤其是其控制保护系统的性能,已成为影响交直流混联电网安全稳定的重要因素.系统故障引发平波电抗器瓦斯保护误动作是导致直流系统闭锁的重要非电气量因素之一,该文详细研究分析了平抗瓦斯的设备原理和特点,采用Gaussian回归算法对平抗瓦斯机械振动与冲击电流的非线性耦合特性进行精细化模拟和解耦,且与电磁暂态算法相兼容,并基于国网仿真中心华东电网电力系统全数字实时仿真装置(advanced digital power system simulator,ADPSS)纯电磁暂态实际工程控保算例进行交直流电网纯电磁仿真,可以详细描述交直流电网故障冲击电流等电气量动态变化对平抗瓦斯机械振动加速度非电气量的非线性快速响应动态特性,为实际工程中多次发生的平抗瓦斯误动导致直流闭锁的事故分析和故障重演、预防及设备改进提供关键技术手段,对进一步提高直流实用化工程仿真的多维度精度具有重要现实意义,并为其他非线性电气相关设备的详细建模提供思路.“,”In recent years,with a large number of HVDC transmission projects connected to the AC system in China,it has an important impact on the AC and DC hybrid power grid.The operational status of the DC system,especially the performance of its control and protection system,has become an important factor affecting the safety and stability of the AC and DC hybrid power grid.Fault in power grid triggered smoothing reactor gas protection misoperation is one of the important non-electrical factors leading to the locking of the DC system,this paper analyzes the principle and characteristics of smoothing reactor gas protection equipment,the Gaussian regression algorithm is used to simulate and decouple the nonlinear coupling characteristics of mechanical vibration and impulse current of smoothing reactor gas protection,which is compatible with electromagnetic transient algorithm.Electromagnetic simulation analysis using the proposed model in East China AC/DC power grid actual engineering example is carried out on the basis of State Grid Simulation Center Advanced Digital Power System Simulator(ADPSS),which can describe in detail the nonlinear quickly response dynamic characteristics for a variety of electric factors such as AC/DC power grid fault impact current dynamic changes to non-electrical quantity of smoothing reactor gas protection mechanical vibration acceleration.It provides key technical means for accident analysis,replay,prevention and equipment improvement of DC blocking caused by smoothing reactor gas protection misoperation which has occurred many times in practical engineering,it also has important practical significance for further improving the muhidimensional accuracy of DC practical engineering simulation,and provides ideas for detailed modeling of other nonlinear electrical related equipment.