Reduced order controller for the alstom gasifier plant

This paper presents a reduced order controller design approach for the ALSTOM Benchmark, which drastically improves the simplicity and reduces the computation effort of the controller algorithm. As the gasifier process is complex with a high degree of cross coupling of the variables, designing a good controller is difficult. The use of optimal control method allows the simultaneous tuning a controller and seeking a tradeoff between the different performance objectives. But it results in a high order controller, which is not in practice desirable. Therefore in this paper, the full order observer is replaced with a reduced one and the state feedback is recalculated such that it guarantees the stability and recovers the performance. This idea can be regarded independent of the case study as a new method for designing a low order controller for high order plants.