IC609SJR101系统还进行如下优化设计。
(1)优化NT6000控制器性能。NT6000DCS控制器型号为KM940,采用PowerPC8247芯片技术,支持精简指令集(RISC),主频400MHz,相当于Pentinum400MHz芯片的运算能力。在冗余状态下以50ms的控制周期运行,控制器负荷不超过15%。
(2)高速转速卡设计。IC609SJR101系统转速卡型号为KM523,在机组高速运行过程中,转速卡连续记录60个脉冲的时间,通过线性回归得出转速值,在额定转速3000r/min下,60个脉冲的时间为20ms,为了进一步提高测量速度,不必等到60个脉冲全部被更新才进行转速计算,只要有一个脉冲被更新,就能得到当前最新的60个脉冲数据,这样计算的结果,是转速卡中的转速测量周期减小到1/3ms。
(3)先进伺服卡设计。NT6000DCS的伺服卡型号为KM522,一般DCS没有专门的伺服卡,采用第三方设备,需要通过通用的模拟量输出卡(AO)将调门指令送到伺服卡。为了提高速度,NT6000在I/O总线上设计了伺服卡,省去了中间环节,伺服卡的控制调节周期小于15ms。
另外,NT6000DCS还采用了先进的控制策略与灵活的组态逻辑,通过在舟山电厂经行小岛运行控制实验,从汽轮机脱网,甩部分负荷以及甩全部负荷,均能在允许的时间内实现小网频率的稳定,满足小网控制的要求。
基于NT6000的小网控制模式,逻辑设计灵活,能够完成功能完善的小网控制逻辑,其较小的迟缓率和较好的控制灵敏度不仅有利并网控制品质的提高,而且有利于小网控制品质的提高。
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