数字同步网统一建模的区域电网数据同步策略

区域电网数据同步需要统一时间断面,目前区域数据在站内、站间的同步修正因子是独立于传输网的,要求收发路径一致。为此,分析了数字同步网同步机理、区域电网同步数据传输的全过程,考虑到电网通信网建有功能强大的数字同步支撑网及监视平台,针对通信传输网承载区域电网数据建立全过程统一仿真模型,集成同步系统硬件配置,优化网络处理过程,采用专用网络分析仪、SDH(同步数字系列)综合测试仪对仿真系统进行性能分析,包括数据的同步精度、同步保护倒换等,提出基于链路层的"MSTP(多业务传输平台)+PTP(精准时间同步)"的统一区域电网数据同步策略,也为配电网自动化实现区域数据同步提供研究依据。

Riccati difference equation in optimal control formagnetic bearings

A model predictive optimal control method for magnetically suspended flywheel is presented.In order to suppress the conical whirl of the rotor caused by gyroscopic effect,the synchronization error is added to the traditional quadratic performance index.The target performance index is composed of the translatory error,the synchronization error,and the control output predicted by the discrete-time state model.The optimal controller is obtained by means of iterating a Riccati difference equation(RDE).Stability of the control scheme is investigated through fake algebraic Riccati technique(FART).The robust performance of the controller with respect to control parameters is studied by simulation.Results of the simulation and experiment on a compact magnetically suspended flywheel demonstrate that the proposed controller with consideration of the synchronization error is very effective to suppress the conical whirl caused by gyroscopic effect.