新型电网结构下火电机组深度调峰控制策略的研究与应用

Research and Application of Deep Peak Shaving Control Strategy forThermal Power Units Under New Power Grid Structure

新型电网结构中,新能源渗透率逐步提高,其发电负荷的随机性、不可预测性对电网稳定性的影响逐步加大,需要以火力发电机组为首的常规能源快速稳定响应负荷需求,实现深度调峰运行,从而有效稳定电网有功平衡。由于火电机组30%负荷以下非线性特性明显,给水、燃料、风量等相互耦合特性更加显著,同时各个控制参数已接近或达到稳定运行下限,解决稳燃负荷以下运行安全性及变负荷速率之间的矛盾是目前火电机组深度调峰面临的问题。作为机组深度调峰运行的核心部分,控制策略的设计与应用能够有效提升机组稳定运行边界工况下的稳定性与快速性,避免AGC及一次调频性能考核,保证稳定运行,结合新型调峰技术进一步优化控制功能,成为新型电网结构下火电机组深度调峰运行的研究应用方向。

In the new power grid structure,the permeability of new energy gradually increases,and the randomness and unpredictability of the generation load gradually increase its influence on the stability of the power grid.Conventional energy sources led by thermal power generating units need to respond quickly and stably to load demand and achieve deep peak shaving,so as to effectively stabilize the active balance of the power grid.Since the thermal power unit has obvious nonlinear characteristics below 30%load,the coupling characteristics of water supply,fuel and air volume are more significant,and each control parameter has approached or reached the lower limit of stable operation,solving the contradiction between the safety of operation below steady load and the variable load rate is the problem faced by the thermal power unit depth peak regulation at present.As the core part of deep load regulating operation of thermal power units,the design and application of control strategy can effectively improve the stability and rapidity of units under stable operating boundary conditions,avoid AGC and primary frequency modulation performance assessment,and ensure stable operation.Combined with the new peak shaving technology,the control function is further optimized,which has become the research and application direction of deep peak shaving operation of thermal power units under the new power grid structure.