VSC瞬时电流控制及李雅普诺夫稳定性分析  

Instantaneous Current Control of VSC and Lyapunov Stability Analysis

作　　者：纪锋 高路 崔翔 吴学光 JI Feng;GAO Lu;CUI Xiang;WU Xueguang(State Key Laboratory of Advanced Transmission Technology(Global Energy Interconnection Research Institute Ltd.),Changping District,Beijing 102200,China;State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China)

机构地区：[1]先进输电技术国家重点实验室(全球能源互联网研究院有限公司),北京市昌平区102200 [2]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《中国电机工程学报》2020年第13期4142-4149,共8页Proceedings of the CSEE

基　　金：国家电网有限公司科技项目(多落点级联混合直流输电系统关键技术研究)。

摘　　要：针对电压源型换流器(voltage source converter,VSC)接入弱电网时易发生的次同步频带振荡问题,该文提出使用三相解耦的VSC瞬时电流直接控制方法来改善系统的稳定性。控制目标可以用一组微分方程来描述,使用差分方程近似微分方程的方法实现了VSC离散时间控制器的设计。为了分析控制系统的稳定性,通过将控制系统实现的约束方程施加在电路系统微分方程中,构造包含VSC控制系统的弱电网系统的微分方程,进而构造了用于判断系统稳定性的能量函数。最后使用李雅普诺夫第二方法,验证了该文所述控制方法的稳定性。In order to solve the problem of sub-synchronous frequency band stability which caused by voltage source converter(VSC)connected to the weak grid,this paper proposed to use the three-phase decoupled VSC instantaneous current control method to improve the stability of the system.The control purposes could be described by a set of differential equations.The design of VSC’s discrete-time controller was realized by using difference equations to approximate the differential equation.In order to analyze the stability,the system’s dynamic equation was obtained by considering the control purpose of the control system,which described by the differential equations.Then the energy function was constructed based on the system’s dynamic equation.Finally,the Lyapunov’s second method was used to verify that the control method described in this paper is stable.

关 键 词：电压源型换流器 弱同步电网 瞬时电流控制 稳定性 能量函数 李雅普诺夫第二方法 

分 类 号：TM76[电气工程—电力系统及自动化]