文章摘要
林涛,陈宝平.采用VSC-HVDC并网的直驱风电场次/超同步振荡特性分析[J].电力系统自动化. DOI: 10.7500/AEPS20170913007.
LIN Tao,Chen Baoping.Analysis on Characteristics of Sub/Super-synchronous Oscillation Caused by Grid-connected Direct Drive Wind Farm via VSC-HVDC System[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20170913007.
采用VSC-HVDC并网的直驱风电场次/超同步振荡特性分析
Analysis on Characteristics of Sub/Super-synchronous Oscillation Caused by Grid-connected Direct Drive Wind Farm via VSC-HVDC System
DOI:10.7500/AEPS20170913007
关键词: 风电  直驱永磁同步发电机  VSC-HVDC  次/超同步振荡  特征值分析  接口矩阵  接口动态方程  阻尼耦合
KeyWords: Wind Power  Direct-Drive Permanent Magnet Synchronous Generator  Sub/Super-Synchronous Oscillation  Voltage Source Converter-Based HVDC  Eigenvalue Analysis  Interface Matrix  Interface Dynamic Equation  Damping Coupling
上网日期:2018-06-12
基金项目:可再生能源发电基地直流外送系统的稳定控制技术
作者单位E-mail
林涛 武汉大学电气工程学院 tlin@whu.edu.cn 
陈宝平 武汉大学电气工程学院 309875997@qq.com 
摘要:
      风电、光伏经由HVDC并网外送已经成为大规模可再生能源基地的主要输送方式。对于风电引发的次/超同步振荡问题,尤其是直驱型风机(Direct-Drive Permanent Magnet Synchronous Generator,D-PMSG)与VSC-HVDC (Voltage Source Converter-based HVDC, VSC-HVDC) 之间相互作用而引发的次/超同步振荡问题值得深入研究。首先分别建立D-PMSG与VSC-HVDC的动态模型,并深入分析与推导两者之间的接口矩阵与接口动态方程,进而得到D-PMSG经VSC-HVDC并网外送的完整动态模型。在此基础上,采用特征值分析法计算得到低频、次/超同步、高频各类振荡模式的参与因子,并据此得到影响系统次/超同步振荡阻尼特性的强相关状态变量及其相应的参量,同时根据模式参与因子判断出次/超同步振荡模式之间存在阻尼耦合。通过PSCAD/EMTDC进行时域仿真,验证了模型与特征值分析结果的正确性。进一步深入研究分析风电并网距离/阻抗、D-PMSG机/网侧控制器与VSC-HVDC送/受端控制器参数对次/超同步振荡阻尼特性的影响,结果表明,同一个控制器参数可同时影响多个次/超同步模式,同一个次/超同步模式可同时受多个控制器参数影响,并且这种阻尼耦合的影响可能趋同(调节控制器参数,耦合的两种模式的阻尼比同向变化),可能趋反(调节控制器参数,耦合的两种模式的阻尼比反向变化),也可能趋同与趋反同时存在。本文的研究为D-PMSG机/网侧控制器与VSC-HVDC送/受端控制器的设计以及参数的协调优化提供了理论依据,具有重要的实际应用价值。
Abstract:
      Wind or PV power interfaced with HVDC system is an important approach to transmit power for large-scale renewable power bases. It is worthy of further study the sub/super-synchronous oscillation (SubSO/SupSO) issue associated with wind farm, especially the SubSO/SupSO Caused by the Interaction between Direct Drive Wind Farm based on direct-drive permanent magnet synchronous generator (D-PMSG) and VSC-HVDC (Voltage Source Converter-based HVDC). Firstly, the dynamic models of D-PMSG and VSC-HVDC were established respectively, and the interface matrix and interface dynamic equation between D-PMSG and VSC-HVDC were deeply analyzed and deduced, and then the complete model of D-PMSG interfaced with VSC-HVDC system is obtained. On this basis, the eigenvalue analysis method is applied to calculate the participation factors of the low frequency oscillatory, SubSO/SupSO and high frequency oscillatory modes, and the strong correlation state variables which affect the damping characteristics of SubSO/SupSO and corresponding parameters to the strong correlation state variables, and at the same time, according to the participation factor, it can be concluded that there exists a damping coupling between the SubSO/SupSO modes. The time domain simulation by PSCAD/EMTDC verifies the correctness of the model and eigenvalue analysis results. Furthermore, the influence of distance/impedance connected to VSC-HVDC power grid, machine-side controller (MSC) / grid-side controller (GSC) of D-PMSG, sending-side controller (SSC) / receiving-side controller (RSC) of VSC-HVDC on the damping characteristics of SubSO/SupSO is further studied in detail, and the results show that the same controller parameter can affect several SubSO/SupSO modes, while the same SubSO/SupSO mode can be affected by several controller parameters at the same time, and the effect of damping coupling may exhibit convergence (adjusting the controller parameters, the damping ratio of the two coupling modes changes in the same direction), or anti-convergence (adjusting the controller parameters, the damping ratio of the two coupling modes changes in the opposite direction), or both of convergence and anti-convergence. The research of the paper provides a theoretical basis for the design and coordinative optimization of MSC, GSC, SSC and RSC, and it has important practical application value
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