Two types of pure electro-hydraulic regulation system used for small turbine of the feed-water pump equipped with ultra-supercritical 1000 MW unit

which use low-pressure turbine oil and high-pressure fire-resistant oil respectively

including the design of control system

the hydraulic servo system

monitoring system

and emergency trip system etc.

have been presented

the structure and control logic of said two types of pure electro-hydraulic regulation system being compared and analysed

the main difference lies in the hydraulic servo system.The control strategy of both is basically the same

and the control functions of them are comparatively matured.The control precision of regulation system using low-pressure trubine oil is 1‰

which can satisfy the requiremetns of control

having advantages of simple system

environment frpendly

and small amount of maintenance work.The pure electro-hydraulic regulation system using low-pressure turbine oil has better economic efficiency

reliability

and environment-protecting behavior.