为了进一步降低凝结水泵运行的厂用电率占比，解决超超临界机组参与电网深度调峰工况下凝结水泵变频控制节能效果受限的问题，通过在1 000 MW超超临界机组上开展现场试验并获取特性数据，针对当前运行现状提出一种适合深度调峰且机组热力系统安全的凝结水泵变频控制策略，并加以实施和变工况验证。优化运行结果表明：该控制策略在保证机组安全稳定运行的前提下，能有效降低凝结水泵的功耗，凝结水泵耗电率由0.218%下降至0.152%；在低负荷阶段节能效果更为显著，在500 MW工况下，凝结水泵功耗由1 057 kW下降至633 kW，下降了40.1%；在400 MW工况下，凝结水泵功耗由1 035 kW下降至512 kW，下降了50.5%。

In order to further reduce the proportion of auxiliary power consumption of condensate pump operation and solve the problem of limited energysaving effect of condensate pump frequency conversion control under the condition of ultra supercritical unit participating in power grid deep peak regulation,through carrying out field test and obtaining characteristic data for 1 000 MW ultra supercritical unit,a frequency conversion control strategy of condensate pump suitable for deep peak regulation and unit thermal system safety was proposed,implemented and verified for the current operation status. The optimized operation results show that the control strategy can effectively reduce the power consumption of the condensate pump on the premise of ensuring the safe and stable operation of the unit,and the power consumption rate of the condensate pump is reduced from 0.218% to 0.152%. The energy saving effect is more significant in the low load stage. Under the 500 MW working condition,the power consumption of condensate pump is decreased by 40.1% from 1 057 kW to 633 kW; under the 400 MW working condition,the power consumption of condensate pump is decreased by 50.5% from 1 035 kW to 512 kW.

TK323