考虑功频协调控制的调速功率闭环模型及实践

Power closed loop model and practice of speed regulation considering power-frequency coordination control

为实现快速、精准和稳定的机组功率和频率调节、保障AGC与一次调频协调控制合理、满足标准规范和调度考核要求,在现有控制模型、逻辑策略基础上,进一步探究提高机组有功调节性能和AGC与一次调频协调性能的有效方法及实现手段。通过汲取两种常规功率闭环模型的优势,建立了一种新型的调速器功率闭环控制模型,对其控制逻辑与新颖的处理策略加以阐述分析。将该模型应用于异步联网下的云南某巨型水电机组调速器,通过开展调速开度模式和调速功率闭环模式下涉网试验,获得了两种功率闭环模式下的调节响应曲线和重点指标数据,从速动性、精准性和稳定性角度对比分析了两种功率闭环模式相同工况下的调节性能。结果表明:相较于常规功率闭环模型,新型调速功率闭环模型在AGC与一次调频协调配合和减小蜗壳水压波动改善机组运行工况方面有一定优势。

In order to realize fast,accurate and stable regulation of unit power and frequency,ensure the reasonable coordination control between AGC and primary frequency modulation,and meet the requirements of standards,specifications and dispatching assessment,this paper further explores effective methods and implementation means to improve the active power regulation performance of units and the coordination performance between AGC and primary frequency modulation based on the existing control models and logic strategies.By taking the advantages of two conventional power closed loop models,a new type of governor power closed loop control model is established,and its control logic and novel treatment strategy are expounded and analyzed.This model is applied to the governor of a giant hydropower unit in Yunnan Province under asynchronous interconnection.Through grid-connected tests under speed regulation opening mode and speed regulation power closed loop mode,the regulation response curves and the key indicator data under two power closed loop modes are obtained,and the regulation performance under the same conditions under the two power closed loop modes is compared and analyzed from the perspectives of quickness,accuracy,and stability.The results show that compared with the conventional power closed loop model,the new speed regulation power closed loop model has certain advantages in coordinating AGC with primary frequency modulation and reducing water pressure pulsation of volute to improve unit operating conditions.