Combined heat and power dynamic economic dispatch (CHPDED) plays a key role in economic operation of power systems.
CHPDED determines the optimal heat and power schedule of committed generating units by minimizing the fuel cost under ramp
rate constraints and other constraints. Due to complex characteristics, heuristic and evolutionary based optimization approaches
have became effective tools to solve the CHPDED problem. This paper proposes hybrid differential evolution (DE) and sequential
quadratic programming (SQP) to solve the CHPDED problem with nonsmooth and nonconvex cost function due to valve point
effects. DE is used as a global optimizer and SQP is used as a fine tuning to determine the optimal solution at the final. The proposed
hybrid DE-SQP method has been tested and compared to demonstrate its effectiveness.