Combining with the variation trends and intercoupling of major variables in a 660MW unit with different operation modes

the global dynamic optimization for unit heat consumption in feasible sliding pressure range with a constant load was realized

through changing the main steam pressure with small step continuously.The results showed that

this test method can search the optimal operating point accurately under the corresponding load

and has excellent test rule.To some extent

it overcomes the limitations of conventional optimization tests that restricted by the instrument accuracy and boundary conditions.The adopted global optimization quantitative calculation model can directly reflect the change trend of unit efficiency during the global optimization

satisfying the thermodynamic calculation requirements for conventional optimization tests.