Sewage dissolved oxygen control method based on steady-state estimation of PID-LSSVM

The invention provides a control method based on steady-state estimation of a proportion integration differentiation (PID)-least squares support vector machine (LSSVM), and aims at solving the problemof DO control hysteresis in sewage treatment. The method comprises the steps of firstly, collecting various kinds of state data under the control of PID, utilizing the LSSVM for learning to obtain arelation between various initial states and PID controller steady-state output values under the states through fitting, then adopting a method of combining the trained LSSVM for estimating steady-state output with the proportion integration differentiation controller for DO control, and introducing an integration control item when an error is smaller than or equal to a certain predetermined valueto improve the control precision. By means of the control method, the defect of traditional PID sewage DO control hysteresis can be overcome, and stable DO control is facilitated. 本发明针对污水处理DO控制滞后问题，提出了一种基于比例积分微分(PID)-最小二乘支持向量机(