CAJ | 학술논문

西北电网联络线调度下AGC指令复杂多变对火电机组稳定运行不利，为了改善火电机组协调控制前馈系统在AGC指令频繁小幅度波动时造成锅炉燃料量大幅度摆动的问题，研究了一种可变滤波时间的非线性滤波器；依据AGC指令变化幅度设计一种变滤波时间的非线性滤波器，对其动态微分部分输出信号进行增益修正和滤波处理；采集西北某电厂660 MW 24 h AGC指令进行算例分析，通过对比改进前后的燃料量指令证明该非线性滤波器可以实现： AGC指令大幅度变化时，前馈足额快速输出，以维持机前压力稳定； AGC指令小幅度频繁波动时，减小前馈输出幅值并增加滤波时间以减少燃料量波动。通过对比改进前后的燃料量指令，证明了可变滤波时间系数的滤波器具有应用价值。
서북전망련락선조도하AGC지령복잡다변대화전궤조은정운행불리，위료개선화전궤조협조공제전궤계통재AGC지령빈번소폭도파동시조성과로연료량대폭도파동적문제，연구료일충가변려파시간적비선성려파기；의거AGC지령변화폭도설계일충변려파시간적비선성려파기，대기동태미분부분수출신호진행증익수정화려파처리；채집서북모전엄660 MW 24 h AGC지령진행산례분석，통과대비개진전후적연료량지령증명해비선성려파기가이실현： AGC지령대폭도변화시，전궤족액쾌속수출，이유지궤전압력은정； AGC지령소폭도빈번파동시，감소전궤수출폭치병증가려파시간이감소연료량파동。통과대비개진전후적연료량지령，증명료가변려파시간계수적려파기구유응용개치。
Under the dispatch of linking-up road, the complexity and variability of AGC command affect the stabil-ity of thermal power units .In order to solve the problem that the amount of boiler fuel swings severely when AGC command fluctuations in a small amplitude , this paper explores a filter-time-variant nonlinear filter , which imple-ments gain correction and filtering implementation on the dynamic differential part of output signal according to the variation amplitude of AGC command .In addition, 24 hours’ AGC command of a 660 MW unit from a power plant in northwest China was collected to analyze the algorithm .After comparing the improved and non-improved fuel command we found the filter-time-variant nonlinear filter can realize the follow effects: when AGC command fluctu-ations in a small amplitude frequently , it reduces feed-forward output amplitude and increases filtering time to re-duce the fluctuation of fuel amount .Thus, the result shows that this filter has a considerable effect on the coordina-ted control system of a 660MW unit.