抽水蓄能机组水泵工况停机策略优化研究

Study on Optimization of Control Strategy for Pump Shutdown in Pumped Storage Unit

鉴于抽水蓄能机组水泵工况停机断电控制策略的制定受水、机、电等因素影响,以黑麋峰电站为例,分析了机组不同水头下水泵工况停机过程中,不同导叶开度断电条件下过渡过程的特性、停机过程机组振动/摆度和压力脉动等关键测点的稳定性参数变化,并对比了水泵工况停机过程与开机过程抽水调相转抽水工况下稳定性参数的差异,结合机组GCB特性确定水泵工况停机过程断电的最佳负荷和导叶开度,优化水泵工况停机策略,实现过渡过程、稳定性与GCB电气寿命指标最优。优化后的水泵工况停机策略能够保证机组安全运行,且停机断电负荷满足相关行业标准。

In view of the formulation of power failure control strategy of pumped storage unit at pump operation condition caused by hydraulic,mechanical and electrical factors,taking Heimifeng pumped storage power station as an example,downtime control strategy at the pump working condition were analyzed under different heads.The transition process characteristics at the pump condition of power outage for different guide vane opening were discussed.The stability parameter variation characteristics for the key points of vibration/sway and pressure pulsation at the process of shutdown were analyzed.The difference of stability parameters from phase modulation conversion to pumping operation condition during shutdown and startup process were compared.Combination the GCB characteristics of unit,the optimal load and the guide vane opening in the power outage process of shutdown at pump working condition were determined,and the shutdown strategy of pump was optimized,which realized the optimal indexes of transient process,stability and GCB electric life.The optimized shutdown strategy can ensure the safe operation of the unit,and the shutdown load can meet the requirements of the industry standard.