The success of the unit grid

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Control system power target value is set to the rated power of 25, the target value, and given the value of the corresponding power valve opening degree.

When the average main stea m pressure is small, the power of the initial value is less than 5, the valve opening is small, there is conducive to the resumption of the main steam pressure to ensure the unit s capacity. When the level

Main steam pressure is too large, the power of the initial value is greater than 5, the valve opening is conducive to reducing the main steam pressure, give full play to the generating capacity of the unit.

The valve turbine inlet steam volume adjustment, the system is accomplished by adjusting the valve. In order to solve the contradiction of the rapidity and economy of, Average

The unit will be required at the start, and the speed and liters of load process, throttle adjustment, when the liter load stable, throttle adjustment into nozzle adjustment

, The throttle adjustment and nozzle adjustment the unperturbed conversion.

These are the valve management, it is a manifestation of the computer control advantages. Each regulating pneumatic accessory  must be individually positioned in accordance with the instruction of the software cam

Each valve must therefore be equipped with a separate power amplifier - electro-hydraulic converter - the oil motive servo system. Valve management system as shown below. The output of the multiplier

Y = (K1X1 t1) (K2X2 t2) cis valve K1 = -1, K2 = 1, t1 = 1 t2 = 0Y = (-X1) X2 single china solenoid valve  K1 = 1, K2 = 0, t1 = 1,

t2 = 0Y = X1X2 above formulas, X1F (X) in sequence valve, the flow rate and the valve opening degree of each valve function f (x) single valve mode, valves

Flow syntax door opening function is generated by a dedicated logic circuit, X2 refers to the PI output.

The process of switching from a single valve to sequence valve, in essence, is the coefficient of X1 from 0 to 1 conversion process. The coefficient X1 and time relationship as shown.

Slope divider logic circuits by X1 decision: 02/120. Logic circuit cycle 02s, 12s, coefficient becomes 09,2 min

Becomes 0. If you want to extend the switching time, the switching process is more stable, and can modify the denominator is 180, the conversion time is extended to 3min.

When no grid or tripping the single valve control, low load, generally as a single valve control. Assuming that the PI output is the degree of opening of 30, the single valve

To sequence valve transformation: t = 0 sequence valve Y = 0 single valve Y = 30 for each valve opening degree is equal to the value of the single valve module the GV1 to GV4, implementing agencies in accordance with the single valve flow

And the degree of opening of the relationship f (x) to be turned.