CAJ | 학술논문

大型火力发电厂通常采用分期建设的方式,使得同一电厂中可能存在轴系扭振频率接近的并联发电机组.该文针对相近扭振频率并联发电机组次同步振荡的机理、特性和风险开展研究.首先采用特征值方法分析了相近扭振频率并联机组次同步振荡的机网振荡模式和机组间振荡模式的形成机理和特点,并对发生于实际系统中的次同步振荡现象给出了清晰、合理的解释.在此基础上,分析了串补度和开机组合方式对两种振荡模式的影响,从而揭示了相近扭振频率并联机组次同步振荡的风险规律.最后,采用数字仿真方法对分析结论进行了验证.
대형화력발전엄통상채용분기건설적방식,사득동일전엄중가능존재축계뉴진빈솔접근적병련발전궤조.해문침대상근뉴진빈솔병련발전궤조차동보진탕적궤리、특성화풍험개전연구.수선채용특정치방법분석료상근뉴진빈솔병련궤조차동보진탕적궤망진탕모식화궤조간진탕모식적형성궤리화특점,병대발생우실제계통중적차동보진탕현상급출료청석、합리적해석.재차기출상,분석료천보도화개궤조합방식대량충진탕모식적영향,종이게시료상근뉴진빈솔병련궤조차동보진탕적풍험규률.최후,채용수자방진방법대분석결론진행료험증.
Parallel-connected no-identical machines with close torsional frequencies as large power plants are usually built in phases. In this paper, the mechanism, characteristic and risks of subsynchronous oscillation (SSO) of parallel connected generators with close torsional frequencies were studied. Firstly, the mechanism and characteristics of Gen-Grid Mode and Gen-Gen Mode were revealed based on eigenvalue analysis. Furthermore, the SSO phenomenon in an actual system was explained reasonably and clearly. On this basis, the effects of compensation level and array mode of generators on the two modes were investigated, and the risk law of parallel-connected generators with close torsional frequencies was revealed. Digital simulation was conducted to verify the analysis conclusions.