基于γ增量型SGPC-PID的再热汽温串级控制

Cascade Control of Reheated Steam Temperature Based on γ Incremental SGPC-PID

近年来受供电格局影响常态化的火电机组频繁深度调峰导致再热汽温波动频率高且幅度大,这不仅降低了机组效率而且影响了机组安全运行。提出了新型的γ增量型SGPC-PID串级控制方案,解决了再热汽温波动幅度大、动态响应时间长等问题。文章为解决再热汽温的问题首先选取了GPC,进一步为解决传统GPC矩阵求逆且参数整定复杂的问题引入了阶梯策略与γ因子。基于γ增量型SGPC-PID串级控制方案,充分发挥了PID的抗干扰性与γ增量型SGPC对惯性、迟延适应能力强等优点。仿真结果表明,该方案对再热汽温控制系统具有较强的鲁棒性及良好的抗扰动性能,可提高系统的动、静态性能指标,且计算简单、参数调节方便。

With the changing of power supply pattern, almost all the large capacity thermal power units are used to depth peak load cycling, which makes reheated steam temperature fluctuate big and frequently. And in this situation, the power units can＇t work safely and efficiently. In this paper theγincremental SGPC-PID cascade control algorithm is proposed, which solved the problems of reheated steam temperature. The GPC is firstly introduced to overcome the reheated steam temperature＇s problem, and then to overcome the marix inversion and parameter adjustment of GPC the stair like control scheme andγfactor are introduced. Theγincremental SGPC-PID cascade control algorithm fully develops the PID＇s anti-interference ability and the SGPC＇s strong adaptability to inertia and delay. Simulation results show that, with better robustness and anti-disturbance performance, this control algorithm not only improves the dynamic and static performance of reheated steam temperature, but also it has the advantage of computation simple and parameter adjust easily.