A new synthesis method for unit coordinated control system in thermal power plant - ADRC control scheme

The new nonlinear control technology-active disturbance rejection control is introduced, and the novel unit ADRC coordinated control scheme for thermal power generation unit is proposed. The key element of ADRC is extended state observer (ESO). The real-time dynamic linearization is implemented by disturbance estimation via ESO and disturbance compensation via control law, instead of differential geometry based feedback linearization and direct feedback linearization theory which need accurate mathematical model of plant. The decoupling for MIMO coordinated system of boiler-turbine unit is also easily implemented by employing ADRC. The simulation results on STAR-90 show that the ADRC coordinated control scheme can effectively solve problems of strong nonlinearity, uncertainty, coupling, large time delay. And it can improve greatly the control performance of coordinated control system. The structure of ADRC coordinated control scheme is simple and clear. It is evident that the proposed scheme lends itself well in providing innovative solutions to practical unit coordinated system problems.