风火打捆经直流送出系统的次同步振荡问题研究

项目名称： 风火打捆经直流送出系统的次同步振荡问题研究

项目编号： No.51507064

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 电工技术

项目作者： 高本锋

作者单位： 华北电力大学（保定）

项目金额： 20万元

中文摘要： 大规模风电与火电打捆经高压直流输电送出时，可能会诱发风、火电系统的次同步振荡问题，影响风/火电基地与外送系统的安全稳定运行。风电场等值方法、风/火电机组相互作用形式、SSDC对风火打捆系统的适用性等关键问题，现有研究均未有效解决。未来风火打捆经直流外送工程将逐步启动，次同步振荡已成为我国电网安全稳定运行亟待解决的重要问题。.本项目拟对风电场进行合理等值，建立适用于研究次同步振荡的等值模型，并采用受控源对换流器进行等效以提高计算效率；揭示风火打捆条件下次同步振荡机理，研究风火比例、直流功率、换流器触发角等关键因素对次同步振荡的影响；基于抑制火电机组次同步振荡问题的SSDC，根据风机轴系自然扭振频率比火电机组低的特点，扩展SSDC的功能，并提出由SSDC、风电场STATCOM和联锁切机预案组成的三层防御体系，提高风火打捆系统抵御次同步振荡的能力；最后，通过哈郑直流工程验证本项目成果的准确性。

中文关键词： 风火打捆；次同步振荡；等值方法；抑制方法

英文摘要： During the transmission of massive wind-thermal-bundled power via HVDC transmission system, the sub-synchronous oscillation (SSO) in thermal and wind power system might be induced, and then the secure and stable operation of massive wind power base and transmission system is influenced. The key problems about equivalent method of wind farm, interaction forms between wind turbines and thermal generators, and the applicability of SSDC in wind-thermal-bundled system, are not effectively resolved. Projects of the transmission of massive wind-thermal-bundled power via HVDC transmission system will be launched in the future, and SSO has become an urgent problem in the secure operation of grid..The rational equivalent of wind farm is conducted in this project. The equivalent model applying for the study of SSO in wind farm is built, and the converter is equivalent to controlled source in order to improve calculation efficiency. The mechanism of SSO in wind-thermal-bundled power system is revealed. The key factors that impacts SSO, including proportion of wind power and thermal power, DC power level, and fire angle of converter, are researched. Based on the sub-synchronous damping controller (SSDC) used to damp SSO in thermal generator and the fact that torsional natural frequency of wind turbine generator is lower than that of thermal generator, the function of SSDC is expanded. For improving the ability of defending SSO, the three-layer defense system consisting of SSDC, STACOM in wind farm and interlock tripping plan is proposed. At last, the achievement of this project is verified by Ha-zheng UHVDC project.

英文关键词： wind-thermal-bundled;SSO;Equivalent method;Damping method